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LALRU MANDI
PUNJAB
PREFACE
Practical training is an important part of theoretical studies. Itcovers all that remains uncovered in the classroom. It offers the
student to exposure an invaluable treasure of experience. It offers
an exposure to real practical of instruments & electronics in the
industries.
As we know that practical training plays an important role in future
building of an individual. One can easily overcome the fear from
that life in which he has to join a member after some time.
Just theoretical knowledge is not sufficient for the success of an
individual so one should have practical knowledge about eachtheory general life. The training greatly enhance our knowledge
and provide good opportunities to blend our theoretical as well as
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trainees get familiar with certain aspect of industries like shop floor
management, production, process and industrial relation etc.
I feel proud to get training at BALLARPUR INDUSTRIES LTD,
YAMUNANAGAR that is one of the tops most paper
manufacturing industries in India. I availed this opportunity in a
very satisfactory manner and I have tried to cover whatever I came
to know in this report.
ACKNOWLEDGEMENT
This report conveys my heartiest thanks to all those officers and
employees of THAPAR GROUP who have given me their full co-
operation and devoted their valuable time, for rendering me their
needy services, guidelines during the course of imparting me
practical training and with those sincere and precious help I have
been able to complete my practical training successfully.
I wish to express my sincere gratitude to Mr. J.K.GROVER (mgr.
Instrumentation) for providing me the training facility.
I wish to express my thanks to Mr. B.S. GILL, Mr. ROOP SINGH,
Mr. B.CHAUDHARY , Mr. DIWAKAR (Dy mgr. Inst.)
,Mr.MAYANK JAIN, Mr.D.GHOSH, Mr.V.SHARMA and all the
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INSTRUMENT DEPARTMENT for their precious co-operation
and guidance during completion of this training.
I also like to thank Mr. PANKAJ LOHAN and Mr. PRAKASH
SHARMA(HR DEPTT) for their valuable support.
INTRODUCTION TO BILT
BALLARPUR INDUSTRIES LIMITED, popularlyknown as BILT is efficiently managed, financially sound,
and self sufficient and self made company is
The flagship of the coveted THAPAR GROUPS.
The Thapar Group is one of the leading business houses in India.It has a turn over of Rest 5000/- Cores; BILT is one of the leading
companies with in the Thapar Group.
The Thapar Group has a wide range of activities like paper,
engineering, electronics, textiles, chemicals, glass,
telecommunications, biotechnology, leather etc.
There are 54 companies and 84 plants under this group. Some of the
main companies under this group are Crompton Greaves, K.C.T &
Bros. Limited, JCT Limited, BILT.
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Ballarpur Industries Ltd. (BILT) promoted by LM Thapar, isthe leader in Indian paper industry with an annual production capacity
of 460000 MT spread over in five manufacturing facilities produces
ordinary and superior varieties of writing, printing and specialty papers
etc. The company is also backwardly integrated with itsCaustisoda/Chlorine manufacturing facility, which is a vital material
consumed in the production process of paper.
BILT, which is originally incorporated in 1945 as Ballarpur Straw
Board Mills, has changed its name in March 1946 to Ballarpur
Paper and Straw Board Mills and again it was changed to the
present name in Oct. 1975. Since then the company has grown to be a leader in paper industry by continuous expansion and
modernization of its capacity and plant and strategic acquisitions. In
1969 the company has merged Shree Gopal Paper Mills with
itself and the company which has acquired the Sinar Mass Pulp
and Paper (India) Ltd. (now BILT Graphic Papers Ltd.)
The company which was one of the most diversified companies in the
pre-liberalization era of industrial licensing with interests in Paper,
Chemicals has decided to focus on its core competence that is in
paper and exit from its non-core businesses. First major steps on these
lines were initiated in the year 1994-95 with hiving off the glass
business. Thereafter the company sold its vanaspati and edible oils
business in 1996-97. And in 1998, the chemical division of the
company with its plant at Karwar, Karnataka and which has interests
in Phosphates, Chlor Alkali and Bromine and Bromine Chemicals wasspun of into a separate company that is Ballarpur Chemicals Ltd (now
Solaris ChemTech Ltd). To complement its Restructuring and to enable
it to emerge as a stronger and more competitive organization, the
company is implementing a project involving modernization and
expansion of capacity at its Units in Shree gopal, Ballarpur and
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Sewa by 105000 TPA. The Project will be implemented in twophases.
In the first phase, the capacity expansion of 35000 TPA and 28000
TPA is planned over a two-year period from 2000-01 to 2002-03 forUnits Sewa and Shree Gopal. In the second phase 42000 TPAof capacity is expected to come on stream at Unit Ballarpur by 2003-
04. During the year 2001-02, the company has completed the up
gradation of pulp mill at unit Sewa resulting in increase in capacity by
37 tones from the earlier 125 tones of unbleached pulp per day. The
company has also completed the installation of a 2.4 meter wide
blade coater at Unit Shree Gopal in FY2001-02. BILT enteredinto strategic alliance with Hansol of South Korea to provide world
class blade coated paper to the Indian customer. it is the first companyin the world to commercially exploit the fractionation of bamboo and
has applied for the world patent for this process. It has also entered
into direct retail distribution with the launch of A4 size, 100-sheet
pack of Royal Executive Bond
Mr. Gautam Thapar, Managing Director of BILT, has beenassociated with BILT since 1986 when joined the company as Shop
floor Management Apprentice-Paper Mills and was instrumental inturning around BILT in the late 1990s.
BILT consists of Five Units:
1. Ballarpur Unit, Distt. Chandrapur, Maharastra.
2. Shree Gopal, Yamuna Nagar, Haryana.
3. Ashti, Maharastra.
4. Bhigwan, Maharashtra5. Sewa, Orissa
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INFRASTRUCTURE
Founder - Late Lala Karam Chand Thapar (1900-1962)
Consist of major industries such as paper, chemicals, glass,
pulp, china clay, electronics etc.
Lala Karam Chand acquired Shree Gopal Paper Mill in 1936 ashe already established himself as a coal king.Shree Gopal Paper Mill earlier know as M/S Panjab Plup and
Paper Company which was initially promoted by Foundation
Company England, the mill was laid shut for 6 month and
was ultimately auctioned.
This unit consists of:
Six paper machine machines.
Two coating plants.
Three finishing houses.
Two power houses.
One caustic soda plant.
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New pulp mill.
CHSR.
At present Unit - Shree Gopal is producing around 250 TPD of
paper. Total Area - 206 Acers.
Factory Area - 155 Acers.
Colony Area - 51 Acers.
Turnover - Rs 24-26 Crores / month.
Manpower -:
Managerial staff 230
Permanent workers 1560
Casual workers 740
Clerical 146
DEPARTMENTS:
The departments are categorized as
Administrative department
PDC People development and communication. Accounts Department.
Material Department.
Sales Department.
Raw material Department.
Traffic Department.
Process Department Mill
1. Pulp Mill
2. Machine House.
3. Coating Plant.
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Engineering Department
a. Electrical engineering.
b. Mechanical Engineeringc. Civil Engine
d. Instrumentation Engineering
e. Power House.
POWER HOUSE
This section of workshop undertakes the maintenance of: -
1. High pressure boilers No. 1,2 and 3(steam pr 85Kg/cm2)
2. ABL Recovery Boiler No. 4
3. JMW Recovery Boiler No. 5
4. Low Pr. Boiler No. 6 and 7
5. T.G Turbine
6. BTH Turbine
7. Black Liquor Evaporation Section
8. Chemical House
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COATING PLANT
This section workshop undertakes the maintenance of: -
1. Colour Kitchen
2. Coating Machine
3 Super Calendar
4 Rewinder
5 Laminating Machine No.1.2 and 3
6 Cutter 1&2
7 Wrapmatic Machine
8 Bundling Machine
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1,Water Treatment Plant:
In this plant, water is purified so as to make it usable for the
boilers. The water, which comes from the pump house, has
the hardness of approximately 200-250 and conductivity
around 300-600 mho. This water with the help of feed
pumps is fed to the reaction tank where it reacts with lime to
remove the hardness of water. The reaction-taking place is: -
Ca (HCO3) 2 + Ca (OH) 2 CaCO3 + H2O
Precipitates settle down and water is collected from overflow
in some adjacent tank. Now, the water is sent to the pressure
filter, where calcium carbonate is taken as filter medium.
After pressure filter, the hardness of water decreases to 50-
60. Now, this water is passed through the cation exchanger.In the cation exchanger, cationic impurities are removed.
Cationic exchanger is charged with HCL every twenty-four
hours. Then, the water flows to the De-gasser. Here, water is
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showered from the upper side and air is pumped from
downwards. When the air strikes with water droplets, it takes
the gas along with it. After this, the water goes to the weak
Base Anion Exchanger, where strong anionic impurities are
removed. The next is the Primary mixed bed, where the
remaining cationic ND anionic impurities are removed. This
water is now stored in the D.M tank. The condensates of
steam are also brought to the same tank after passing through
charcoal and iron filters. To ensure the required standard ofde-mineralized water, the water is taken to the secondary
mixed bed. Ammonia is dozed in this water so as to increase
the pH to about 6.8-6.9. Now, this water is sent to the boilers
for steam production.
2.Boiler section: -
The boiler section has two main parts: -
1. Coal fired boilers
2. Recovery boilers
2.1.Coal fired boilers
The coal-fired boilers are of two types:
a) High pressure
b) Medium pressure boilers
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Out of total seven boilers, Boiler No 1,2 and 3 are H.P. Boilers;
Boiler No. 6 & 7 is M.P boilers and ABIL & JMW are the two
recovery boilers.
In the boiler, the steam is produced in the following manner.
Water comes to the steam drum from the P.D.M tank. This tank is
surrounded by steam line due to which inlet water temperature is
approximately 48C. Here, morphine is dozed in the water, so as to
laminate the pipes internally to increase the life of pipelines. The
water is then taken to the Derator Tank. In the Derator Tank, wateris showered from the upper side and steam is taken from the
bottom side. This steam removes the air and increases the
temperature of the feed-water. In the Derator Tank, hydrazine is
dozed for the reaction with oxygen in the air. The reaction-taking
place is: -
N2H4 + O2 N2 +2H2O
The outlet temperature of water in the Dearator Tank is around
110C + 5C. From the Dearator Tank, water goes to the
economizer. In the economizer, the heat of outgoing flue gases is
used to increase the temperature of water from 105C to 235C
(approx). The water from the economizer goes to the steam drum,where Na2PO4 is added to water so as to remove the silica left (if
any) from the water. From steam drum, water through section lines
goes to the mud drum. Precipitates of Na2PO4 and silica settle
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down and are drained off from the mud drum using CBD. Water
from mud drum through sections lines goes to the furnace. In the
furnace the temperature is around 1200-1400 deg C. This steam
then goes to super heaterzone.
In this zone, there are two super heaters primary and secondary, an
temperature is connected in between the primary and secondary
super heater to control the temperature of out going steam by
spraying pressurized water droplets. The steam produced is then
connected in the header and then it is sent to the turbine section.
2.2.Recovery boilers
The process of producing steam is same in recovery boiler as in the
coal feed boilers. The difference lies in the combustion. In
recovery boilers, the heat energy is recovered in boilers; heat
energy is recovered from the wastage. The conc. black liquor from,
evaporate section is taken and sprayed into the furnace by a nozzle
of black liquor gun. As the black liquor falls into furnace at its
ignition temp. The organic part of it i.e.-lignin burns to give heat
energy and inorganic part i.e.- sodium salts are collected as smeltwhen dissolved in water is called weak white liquor or green
liquor.
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Three Element Control Loop in
The Boiler
Feed water flow
This control loop is used to control the feed water flow. The feed
water control systems, maintains the drum level at a manually set
value by using both feed forward and feed backward control. The
feed for a signal is the steam flow measurement, which
manipulates the set point of feed water flow controller and
therefore, manipulates the feed water flow to equal the rate of
steam being withdrawn from the drum. The bias of the summing
unit is such that during steady state conditions the output of the
drum level controller does not affect the set point of the feed water
flow controller. Since the liquid level process is subject to rapid
load changes and is not self-regulating, feedback must be applied
to eliminate drift. The feed back path is formed by the drum level
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signal from the drum level controller. This controller trims out the
change in error during a load change or other transient variations in
drum level.
Air Flow Control Loop
The next very important control loop is the Air Flow Control Loop.It is required because in deficiency of air, there will not be proper
burning of coal and in case, the air is present in excess, we have the
heat loss. Thus in both cases there is an economical loss. So we
have a control loop for air also.
General Data of Boilers
1) H.P Boilers (no. 1, 2 & 3)
Steam Pressure at output-86 kg/cm2
Steam Temperature at output-490deg celc.
Steam producing capacity- 35-tones/ hr2) Recovery boilers (ABIL & JMW)
Steam pressure at output -46 kg/cm2
Steam temperature at output-400 deg celc.
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Steam producing capacity - 35-tones/ hr
4. Turbine section
There are two turbines of capacity 18 MW & 6 MW respectively
(namely TG and BTH). Both the turbines are steam driven. The TG
turbine uses steam at a pressure of 86 kg / cm2
And the BTH turbine uses the steam at the pressure of 46 kg/cm2.
Generally, 4 tones of steam is used for the production of 1 MW of
electrical energy as per approximate value. The process ofproducing electricity is same in both the turbines. The rotary blade
of the turbine is set to motion by the steam pressure and hence the
shaft of the turbine, which is coupled with the generator, rotates
and produces electrical energy.
Genral Data of Turbine:-
Inlet Steam Pressure: -86Kg/cm2
Inlet Steam Temp. :-( 490 +5deg.C) or (490 5deg.C)
Steam pressure at first extraction: - 10Kg/cm2
Steam temp.at first extraction: - 270deg.C
Steam pressure at second extraction: - 3Kg/cm2
Steam temp. At second extraction: -150deg.C-170deg.C
Input RPM to gearbox: -8000
Output RPM to gearbox: -1500
For BTH Turbine: -Inlet steam Pressure: -46Kg/cm2
Inlet Steam temp: - (490 + 5deg.C) or (490-5deg.C)
Input RPM to gearbox: - 1500
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PULP MILL SECTION
Raw Materials & specifications
Paper is made of pulp and pulp is made of fibers, which is obtained
from various materials like grass, bagasse, wood & bamboo. Any
material for pulp is selected on the basis of: -
1. Ample supply
2. Available to pulp mill throughout the year.
3. High yield of quality fiber.
4. Should not deteriorate in storage.
5. Capable of being collected & stored in small area and
transported, if necessary, at low cost
6. Cost of conversion to paper must be low.
7. Cellulose fiber must be of suitable size and character.
8. Location of paper mill must be close to the location of the
raw material.
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9. It must make paper of sufficient quality to be competitive in
the international market.
10. It must be cheap.
11. Must give good printability.
The ideal fiber for high-grade paper should be high in cellulose
content and low in lignin content. The raw materials used in the
paper industry are of two types: -
1. AGRO BASED
These are the short fibers.1. Bagasse
2. Khal
3. Khar
4. Sabai grass
2. WOOD BASED
1. Bamboo
2. Eucalyptus
3.Veneer waste
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Chipper House
Introduction
It is necessary to reduce the wood to chips for pulp manufacture in
order that the cooking liquor may penetrate the wood quickly,
completely easy to transport pneumatically or on belt conveyers,
and to store. This operation is known as chipping and the machine
used for cutting the wood into chips is known as chipper. Thus,
chipping is a necessary operation but is also a drastic action, which
caused fiber damage and effects pulp quality. Damage is caused
when wood is subjected to compressive strain as a result of
bending, twisting or compression.
Screening Size
The size of the acceptable chips after screening variesconsiderably. In sulphite process, the aim is to have an average
chip length of about 20 mm but chips are present ranging from less
than 10mm to over 35mm long. Shortening of the chip length tends
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to give better impregnation of the chips, it is not suitable to
decrease the chip length too much, as a big number if the fibers
will be shortened and thus the strength pf pulp decreases. Short
chips also mean more fines and saw dust, higher power costs in
chipping, a smaller percentage of long fibers in the pulp and
reduced pulp yield.
New Pulp Mill
Introduction
The New Pulp Mill has been set up recently to produce the
indigenous pulp for paper machines of the unit. The setup of the
mill was aimed at fulfilling the needs of paper machines numbers
4,5, and 7. New pulp mill has helped in becoming self-dependent
in terms of pulp requirement. Chief raw materials used are
eucalyptus, bamboo, wood scrap and poplar etc. The raw material
is first chipped in the chipper house with the help of two venoclain
drum type chippers, the wood/raw material is converted into small
chips of size 1 * *1/4. After chipping operation the chips are
cooked in the digesters where indirect heating of digesters is done
with the help of white liquor and black liquor mixer. After proper
cooking the cooked slurry is washed. At the brown stock we are
using four washing stages working in counter current fashion.
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After adequate washing the pulp is bleached at four bleaching
section the desired brightness of the pulp is obtained without
degrading the quality of the pulp.
Finally the pulp after cleaning operation through centri cleaners is
stored in bleached high-density towers. This final pulp can be sent
to corresponding paper machineries. Important steps in cooking or
digesters control operations.
Liquid Penetration
To ensure reaction, it is important that all the fibers in the wood gettheir proper share of chemicals and heat. Now charging of liquor
starts. First of all we start white liquor pump (white liquor contains
NaOH+Na2S) and charge white liquor as per need when required
quantity is charged, we close the respective liquor charging pump
and charge the black liquor as per the required quantity.
Digester Heating
After this, digester cooking commences. It takes place in two ways:
-
1. Direct heating
2. Indirect heating
The digesters in the NEW PULP MILL are indirectly heated.
Indirect heating involves the circulation of cooking liquor through
external heat exchangers with the aid of circulation pumps, which
draw off cooking liquor through strainers in the digester walls and
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deliever, the heated cooking liquor at appropriate inlets. The
following are the advantages of the indirect cooking system: -
1.Uniformity of circulation through out the digester.
2.Uniformity of quality.3.Increased yield.
4. Increased pulp strength.
5.Steam saving.
For ideal cooking the following parameters should be checked:
1.Proper temperature - 165 deg. C
2.Cooking time - 90 Min (at 165 deg. C)
(Total time 260 min.)
3. Pressure - 8Kg/cm2
Digester Blowing
During the blowing of the pulp and black liquor go to the blow
tank and blow condensed steam vapors to the accumulator tank
having primary and secondary condensers, which are in operation
till blow is finished. From accumulator tank condensed steam goes
to heat exchanger through fiber filter to arrest any fibers going with
the condensed vapors.
In heat exchanger warm water is pumped from warm water tank
and hot water goes to hot water tank, which is used in brown stock
washing and bleaching stages.
Brown Stock WashingIt is the process in which the dissolved organic and in organic
materials are removed from pulp by filtreation. Our objective
should be to obtain most efficient washing by using minimum
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amount of water. For this purpose we have four washing stages
operating in counter current fashion.
A low consistency suspension pulp (1-2%)is spread into vat which
contains rotating drum filter vaccum created is applied to drum
which cause the slurry to thicken as the liquor filtrates through the
surface of the drum, as drum cylinder rotates a sheet of pulp is
formed on the pulp surface which passes through spray wash zone
and then drying zone and finally it is discharged.
ConsistencyVaccum drum filter operates with 1% feed consistency and 11 14
% discharge consistency.
Bleaching
The unbleached pulp contain a large amount of lignin and some
other impurities which have been left behind after cooking and it is
essential to bleached these pulps to obtain brighter pulps without
degradation of cellulose fibers. Thus the main aim of bleaching of
pulps can be summarized as follows:
1.Removal of residual lignin left after cooking and destruction and
solubilization of coloring matters.
2.Removal of objectional dirt particles in form of five specks in
pulp.
3.Retention of strength properties of the unbleached pulp.
4.To obtain greater brightness at low cost.
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The following various types of chemical may be employed for the
bleaching of pulp: -
1. ClO2, Cl22. H2O2, Na2O2
3. So2, NaHSO34. O2
Washing
Again washing is done to remove the liquid chlorine from the pulp.
Refiner
The pulp is refined in the refiner. We have to refine the pulp to
make short fibered.
Mixing Chest
In the mixing chest pulp is mixed with Rosin, Alum, Ranipal and
filler like Carbon black as per requirement of the paper.
Machine Chest
After mixing the pulp is transferred into machine chest where its
consistency is maintained.
The fibrous pulp from machine chest is taken into the head box; normally
the consistency pf pulp at this stage is kept 1.5 to 2 percent .now the pulp
is make to pass on through the wire pat where the considerable amount of
water is taken out of the fibers and paper web moves ahead to the presspart .At these stage web is pressed in between the press rolls to reduce the
moisture contents of fiber .The press section has two parts:
The first press
The second press.
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Now the paper is taken on to the dryers for drying purpose.
After passing through predryers an intermediate stage comes known as the
size press where the sizing chemicals such as starch are added. Then after
passing through the post dryers section paper goes towards thecalendar .A calendar is to smooth and shine the paper .Now the paper is
wrapped on the drum reel .At the final stage the paper contains moisture
contents about 5-6%.
After this the pulp is transferred to Specialty Department
where required quality paper is made from this pulp.
SPECIALITY PLANT
In paper industry a raw material (pulp) is then brought into paper
plant, technically called Specialty Paper Plant. The Specialty
paper machines installed here make Executive bond, Sunlight
bond and other high quality paper.
Machine No. 5: -The pulp turns into a paper of required thickness after passing
through a number of stages and number of sections: -
1. Hydra Pulper:-It is the main chamber of pulp. Here raw
material rotates with the help of rotor. Here the backwater of
process is added because it contains chemicals. If we want to
change the color or quality from superior to inferior or vice
versa, then fresh water is used.
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2. Dump Chest: - The pulp comes into dump chest from hydra
pulper. Here pulp is beaten accurately.
3. Circulation Chest: - The function of this chest is to reducepulp into smaller particles.
4. Stock Refinery: - It removes impurities from the pulp and
beat the pulp.
5. Mixing Chest: - The mixing and machine chest further beat
the pulp.
6. Machine Refiner: - They remove remaining dust from the
pulp.
7. Constant Level Box: - It consists of two chambers, which
give the level of the erkensater. Its level remains constant
always.
8. Open Screen: - It consists of a hollow type roller, which is
covered by an iron net having equal no. of holes. It removes
heavy dust particles.
9. Head Box: - In this we detect weight of paper. In this
fresh water, are mixed highly purified pulp and their
ratio depend upon weight of paper.
10. Wire Section: - In this the pulp moves on belt in the
form of sheet.
11. Press Section: - In this section vaccum pressure is
applied on the sheet of paper to reduce the moisture content.
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12. Dryers: - Here heated steam dryers absorb almost
100% of the moisture.
13. Size Press: - In this section we smoothen the paper we
smoothen the paper with the help of roller.
14. Drum Roll: - Final Bond paper rolls over this roll.
COATING PLANT
In This Plant we increase the shininess & Strength of a Paper.
Colour Kitchen:
Firstly, The coating material is made in a colour kitchen at suitable
concentration of different chemicals.This Preperation is called
Recipe and this can be made by Kaddy Mill. Chemicals Include
Starch,Latex,Calcium Carbonate & several other resins which are
imported from MALAYSIA & BRAZIL.
Coaters:
This Material goes to the three Coaters which coat this material on
a paper at three stages. At each stage we find its moisture
contents,thickness etc. by scanner.
Super Calendar:
From coater this paper reels goto Super Calendar to increase its
Shinning by continuous rolling a Reel in a cylinders.
Rewinder:
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After this paper goes to Rewinder where reel is packed more
efficiently.
Lamination Machine:
If we want to make a laminated paper then we send the paper to
lamination Machine in this two reels of paper from different ends
are joined with a help of glue which is made of starch. If we need a
paper for playing cards we put black die in glue so that we cant
see what is written on opposite side.
Now this laminated paper is dried by steam cylinders which are on
a above side of lamination Machine.
Cutters:
After this paper goes to 2 Cutters to make a sheets of proper size.
These paper reels are cut in form of sheets by pneumatic cutter
which are carrying circular knife.
Wrapmatic machine
These sheets are go to Wrapmatic machine for bundling. This is
specially designed Machine in which we have three grippers .
We feed the paper in it either automatically or manually,which are
picked by jaws like structure and through belt it pulled back where
it is picked by gripper 1,we use cylinders for each gripper.
Gripper1 forward this bundle of paper to gripper2 then gripper2
send it to gripper3 but before gripper 3 this bundle is covered by
outer cover which comes here with the help of reel this isstraighten by vaccum when bundlr reach near it ,this outer cover is
cutted by a cutter.gripper3 picked this bundle one rodless cylinder
is use to apply glue .it is pneumatic cylinder. We use brushes to
increase smoothness in gluing .Then this bundle goes under the
another glue nozzle to glue the sides.this glue is maintained on
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high temperature so that our glue not solidifythis is maintained by
head & hose.this bundle move to different lifts the location of lifts
is controlled by gate which in turn is controlled by cylinder.
From there we move a paper to Finishing House.
Instrumentation
These days instrumentations very vital to modern
industries . The use of instrumentation system is in power plant, process
industries, automation, production machines,various control and safety devices
etc.A device used directly or indirectly to measure or control a variable. The term
includes primary elements, final control elements and electrical devices such as
Annunciators, Switches, Push buttons.
A collection of instruments which directly or indirectly observe measure and
control the physical parameters (flow, temperature, pressure, level) or
combination of these.
PARAMETERS OF INSTRUMENTATION
1). Pressure
2). Temperature
3). Level
4). Flow
5). Consistency
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6) . PH
761 CONTROLLER(Bells make)
The single station controller used in BILT is the 761 series station
controller .The 761 station controllers is self contained microprocessor
based controller having the standard proportional integral and derivatives
function .The exact tuning method used in it does not use any arbitraryprocess model .Instead it takes microprocessor technology. To make
controller adjustments based on the actual current process dynamics. The
controller is equipped with an RS485 serial communication port. This
controller has got all the configuration and operating parameters being
stored in a non-volatile memory .During a power failure essential
controller settings and last operating condition are saved indefinitely and
no batteries are required for it.
The input signals for the controller are:
Current input:
The controller can have up to four currents inputs .the input standard
range is 4-20 ma into 240 ohm input range can changed to 1-5v dc by
changing input.
Thermocouple converter input:
One 4-20 mA measurement signal from temperature transistor orequivalent using thermocouple is provided to
the controller.
RTD input:
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It is used for one input from 100 ohm platinum RTD for direct
temperature measurement or two elements RTD for direct temperature
measurement or two elements RTD for temperature difference input.
Discrete input :The controller can have up to two contact or transistor switch input 5V
DC nominal open circuit voltage 1mA maximum current.
The output signal for the controller are:
Control output signal:
4-20 mA DC into 500 ohm maximum standard non isolated output.
Auxiliary Out put signal:
It can be configured to transmit the measurement, setpoint, condition input
or output 1 signal as a 1-5 V DC output signal into 2K Ohm minimum.
Discrete input:
The controller has two non isolated open collector transistor switch output
.switch reading are 50 V DC maximum and 250 mA maximum.
Transistor power :
The standard controller can provide 25 V DC nominal field power to two
4-20 mA transmitters .power supply has 250 ohm limiting resistors at
each transmitter connection.
Its operating limit in terms of temperature is 5 and 50 C. The relative
humidity limits are 5,95%.the supply voltage required is
A.C supply voltage :
110V, 220V, 50 Hz.
D.C supply voltage :
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24 V ,1 mA
The resolution of the display is +-0.1% of the upper range value. The
resolution of the bar graph is 2% of upper range value.
Segmented graphic display indicates the set point, measurement and
controller output .Each segment represents an incremental reading of 2%
of span the set point is indicated by illumination of the single segment in
the set point display. For measurement and controller output reading the
segment illuminates to form a bar graph .The desired reading is selected
by a selector key the function being displayed is identified by an
illuminated dot located above the corresponding bar graph.
The controller operates in one of the three following modes: NORMAL
,READ OR SET . In NORMAL operation the controller performs the
usual controller function READ mode the operator can read the value or
status of various control parameters . In SET mode the operator can
change these parameters and can adjust them according to their
requirement .
The description of various keys of the controller is given below
W/P :
Depending on the configuration it permits the controller to be
used either as a workstation or panel controller.
R/L :
Depending on the configuration it permits the user to select
remote or local set point .
A/M
Depending on the configuration it permits the operator to select
automatic or manual controller.
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TAG
Used to go from normal to read mode and to return from any
point in read or set mode to normal mode.
In normal operation used to change local set point ,output etc. in reador set mode used to change configuration settings and to sequence through
parameters categories.
ACK
In normal mode used to acknowledge an alarm condition .in read
or set mode used to step sequential through every parameter in
structure
SEL
In normal mode used to move the bar graph identifier dot .in
read or set mode returns display in minor incremental back
through program structure.
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PROGRAMMABLE LOGIC CONTROL
The P.L.C stands for Programmable logic control .It is an industrial
computer based system which performs discrete and continuous
control function for a plant or factory automation .The first P.L.C
was designed in 1968.
Some of the points describing how a P.L.C is different from a
computer are as follows:
Real Time Operation :
The P.L.C is a real time operation system.
Environmental design :
The P.L.C is much more suitable for the environmentalconditions like heat, dust moisture electrical noise,
interference etc.
Programming language :
The programming done in P.L.C is relay logic programming
and also sometimes blocks oriented language.
Maintenance and troubleshooting :The P.L.C has got modular design and inbuilt diagnostic
software due to which the maintenance and problem
emerging are dealt with very easily.
The various P.L.C components are as follow:
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C.P.U
Power supply
I/O System
Programming Unit
Peripheral Devices
A brief description of these elements is given below:
C.P.U:
It stands for the central processing unit .It contains the processor
which performs all the work required to be done for the process
control .It act as the brain of the P.L.C it performs function which
are given below:
Logical operation:
It performs the logical operations like AND, OR, NOT.
Timers:
The C.P.U can also provided the functions of a timer .It canprovided on delay (the output will be produced after a certain delay
pf applying the input),off delay (the switching off occurs after a
delay of applying the switch off command .Pulse (high output
when input is high and low output when input is low)
and extended pulse (it has the same output as for the pulse but it
completes its pulse time even when the input signal goes low.
Counters:
This function of C.P.U is used to count up as well as down.
Flip-Flop:
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It is used to latch the signal.
Power supply:It is used to charge the various units (I/O system, peripherals &
C.P.U) connected together to make a P.L.C it supplies the power at
various levels as required by the units.
I/O System:
The input module is used to convert the various input signals
which are in the form of 24V DC, 220V AC, which are understood
by the C.P.U the output module does the work opposite to that ofthe input module it converts the 5V DC signal given by the C.P.U
to 24 V DC 220 AC as realized by the other devices in the field.
Programming Unit:
The programming unit provide an inter face between the P.L.C and
the user during the program development start-up and trouble
shooting.
The programming of P.L.C can inform by three ways:
STL statement list
Ladder logic diagram
Control system flow
The tools need are :
Programmer
Software
The connector used for the purpose of connecting programmer &
P.L.C is RS 232 it is 9 pin used for serial communication.
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Peripherals:
The peripherals include communication cards and memory. The
communication cards are used by C.P.U to send and receive thesignal to and from various ends respectively. The memories used
are ROM and RAM. To store the application and the executives
program.
Types:
The P.L.C are of two types: Modular
Non-Modular
The modular type of P.L.C have each and every components fitted
in such a way that it can be checked by taking it out but the non
modular type of P.L.C have every thing fitted within & it can't be
taken out in any way .
Companies:
There is a wide variety of P.L.C available in the market but most
common trade names in P.L.C are :
Siemens
Messung
Bhartiya Cutler Hammer
Allen Bradely
Telemecanique
Cegelec
Crompton Greaves
Factors:
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The factors which are kept in mind while selecting a P.L.C:
1Number of inputs and outputs
2.Cost
3.Space available4.Speed and scan time
How P.L.C Works
The functionality of P.LC includes the following:
Input updating
Program execution
Output updating
The functioning of the P.L.C include firstly input updating it
checks every input &updates the input value if it gas changed.
Then it executes the program feed in already and then according tothe values generated for a output it gives the output .The time taken
in performing the above three functions is called the scan time.
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INSTRUMENTS USED IN BILT
1. Conductivity measuring instruments used in D.M. Plant.
2. pH measuring instruments used in D.M. Plant .
3. Flow measuring instruments installed at PDM tank, super
heater, water inlet in steam drum and in turbine section.
4. Pressure measuring instruments installed at ID fan, FD fan,
main steam pipe, derator tank and turbine section.
5. Temperature measuring instruments used in main steam
line, derator tank, steam drum, furnaces and also in turbine
section.6. Level measuring instruments used in various drums and
tanks used in this section.
7. Control valves are installed at different places in the whole
powerhouse.
8. Speed measurement of rotational speed of shaft in turbine
section.
9. 761 controller is used in every section of powerhouse.
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Control Valve
A control valve is a final control element in a running process.
The change in the position or condition of the control valve
varies with process parameters. In level, pressure, flow and
temperature applications control valve can control the process
according to the requirement .It consists of three parts: -
1. ACTUATOR: It is a part of control valve, which apply
the force on valve for controlling the process. It looks like
piston, which can move up and down according to therequirement. The actuator is based upon the concept of pressure.
F = (P1 - P2) x A
Where, P1-P2= Pressure difference
A= Diaphragm area
F= Force applied
2. VALVE: It is a part of control valve, which can be operated
with the actuators manually, and an actuator operates valve. It
has many types : -
a) Butterfly valves
b) Pilot valves
c) Plug type valve
3. POSITIONER: These are fast responding precision
calibrated, force balance instrument providing accurate valve
positioning.
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Flow Measurment
Flow Measurements are also important parameters to be
measured. The flow rate of the flowing pulp gives an idea of the
consistency of the pulp. The various flow meters, which areused in BILT, are: -
1. ROTAMETER: - It consists of a vertical tube with a tapered
cone in which a float assumes a vertical position
corresponding to each flow rate through the tube. The tube is
made up of steel and float is of brass. It works on equation: -
Qv = CEA2/Zgpd-------
e
If Pd = Pressure is held constant then volume flow rate is
directly proportional to orifice area.
2. ORIFICE METER: - It consists of an orifice plate inserted
in a pipeline cases an increase in flow velocity and a
corresponding decrease in pressure. The Flow pattern shows
an effective decrease in cross of flow beyond the orifice platewith the maximum velocity and minimum pressure. The plate
may be concentric, eccentric or segmented.
3. VENTURI METER: - The basic design of a venturi tube
comprises three sections viz the converging conical section at
the upstream, cylindrical throat, diverging recovery outlet cone
at the downstream. The inlet cone tapers down from the pipe
area to the throat section of a smaller area to produce thenecessary increase in velocity and decrease in pressure. The
throat provides a point of the measurement of this decrease in
pressure where flow rate is steady.
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Magnetic Flow Meter
The transmitter is based upon the principle of Faradays law of
EMI according to which, when a conductor is moved in a magnetic
field, a voltage is induced in the conductor.During theelectromagnetic flow measurement, the fluid passes through a
magnetic field applied normally perpendicular to the direction of
liquid flow. The movement of liquid induces and electric voltage
which is proportional to the average field velocity and therefore to
the volume of flow.
In the case of electromagnetic flow transmitter:
U = K x B x D x V
Where, K = Instruments constant
B = Strength of magnetic field
V = Average velocity
D = Pipe diameter
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Pneumatic Current to Pressure converter
The main principle behind this type of I/P converter is that a core
is wounded by coil, which receives a standard input signal of 4-20
mA, and it converts this electrical signal into a pneumatic signal.
According to Faradays Law when a coil is carrying a current, a
strong magnetic field is produced around the coil. This magnetic
field is used to attract the soft iron core, to which is attached a
flapper and nozzle.
The nozzle opening is governed by the amount of current through
the coil. A strong signal, i.e. large current would bring the flapper
closer to the nozzle and this is provided to a pneumatic relay
which produces an output in range of 3-15 PSI which are linearwith 4-20 mA input signal. This output is capable to operate the
control valve.
I/P transmitter is also known as current to pressure converter
since it converts or transmits current signals into pressure signal.
In control loops where control valves are used I/P converter are
used to operate the control valve.
The transmission of signal to current is required since controllers
in control loops are current controlled. The controlled valve openand close according to a set point. The signal from the controller
is electrical but nature of control valve is pneumatic. So I/P
converters render the signal, which is suitable for control valve
operation.
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Temperature Measuring Instruments
(A)Thermocouple:- Thermocouple is made up of two dissimilarwires joined at their measuring and forming the measuring
junction and hot junction.
A small voltage known as sees back voltage creates at another
junction.i.e.cold junction. This voltage change in accordance with
the temperature. The controller or monitor measures the small
voltage and converts it into a temperature signal and controls the
temperature of loop and tank.
(B) Resistance Temperature Detector (RTD): - RTDs areusually platinum wire, wound on a glass or a ceramic babbin and
sealed with a coating of ceramic or glass. They can also be made
by depositing platinum as a film .The electric resistance of RTD
changes as a function of temperature.
The circuit is similar to a wheat stone bridge .A constant current
into the bridge produces an output voltage that varies with
temperature.
RTDs are generally more accurate and more stable over time than
thermocouple.
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pH meter
pH Meter :
It is a device which measures the pH of any liquid such as acid
alkalies and water.
Introduction about pH :
pH is a chemical factor which denotes the acidity or alkalinity
of a solution . The degree of acidity or alkalinity of an aqueous
solution is determined by relative concentration of hydrogen andhydroxyl ions in that solution. When the hydrogen ion
predominates the solution is acidic and when hydroxyl ion
dominates it is alkaline .
Working of pH Meter:
Hydrogen ion concentration is measured on scale that ranges from
0-14. When the value on scale is 7.0 hydrogen ions and hydroxyl
ions balance each other as in case of distilled water.
When the pH value is more than 7.0 solution is alkaline and when
the value is less than 7.0 the solution is acidic.
The measurement is done by immersing a cell (pair of electrodes)
into the solution to be measured and measuring the voltage
developed across them .In the pH cell one of the electrode isreference electrode is at a potential regardless of the pH value of
solution under test. The potential of the other electrode called
measuring electrode is determined by pH value of solution. Thus
the potential difference between the two electrodes depend upon
the pH value of the solution.
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Now a days combination electrode is used thus eliminating the
need of two electrodes .The combnation electrode is a delicate
chemical transducer to be handled very carefully .The pH
combination electrode generates the potential difference which is afunction of the pH value of the solution being tested. This is
amplified and calibrated and fed to digital voltmeter which is again
suitably calibrated to read directly in pH.
Differential Pressure Transmitter
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Pressure Measurement:
The differential transmitter may be used for measuring liquid flow,level or other applications requiring accurate measurement of
differential .The quality of measurement depends to a great extent
on proper installation of the transmitter.
Construction of Differential Pressure Transmitter
A pressure transmitter consists of sensor element two metal pieces
are separated by sensor element seal as a diaphragm .It has two
states low and high oil is filled in it and this system is covered with
an insulator. When we apply the pressure on its low or high side
then the pressure flows through the middle diaphragm and the
middle diaphragm offers capacitance effect due to two plates
separated by an insulator.
In this system insulator is diaphragm and conductive surface is themetal piece when oil is linked with the diaphragm.
When pressure is applied then capacitance C2 increases and C1
decreases .It flows from high level than voltage will be developed
across to terminals, which is differential pressure, so it called as
differential pressure transmitter.
The pressure transmitter has a variable capacitance-sensingelement the - cell. The differential capacitance between the
sensing diaphragm and capacitor plate is converted electronically
to a two wire 4 20 mA DC signal.
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Liquid Level Measurement
Differential pressure transmitter used for liquid level applicationmeasures hydrostatic pressure.
The pressure is equal to liquid height above the tab multiplied by
the specific gravity of the liquid. Pressure depends upon volume or
vessel shape.
Open Vessel:
A pressure transmitter mounted near a tank bottom measure the
pressure of liquid above. Make connections of the high-pressure
side of the transmitter went the low.
Closed Vessel (Wet Leg Condition):
Pressure above a fluid affects the pressure measure at the bottom of
a closed vessel.
The liquid specific gravity multiplied by the liquid height plus the
vessel pressure equals to the pressure at bottom of the vessel.
To measure true level the vessel pressure must be subtracted from
the vessel bottom pressure. To do this, make pressure tab at the top
of the vessel and connect this to the low side of a differential
pressure transmitter.
Vessel pressure is equally applied to both the high and low side of
transmitter. The resulting differential pressure is directly
proportional to liquid height multiplied by liquid specific gravity.
I/P Transmitter
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Current to pressure transmitter accepts the electrical inputs signals
and converts it into proportional pneumatic output. Typically 4 to
20 Ma is converted to 3 to 15 pounds per square inch (Psi).the most
common application of this transmitter is to receive electricalsignal from a controller and to produce a pneumatic output for
operating a control valve positioner .
It has a solid state pressure sensor that moniters the output
pressure and is a part of electronic feedback network.
The final assembly of a transmitter contains the electronic circuit
board, pilot/actuator assembly and booster stage.
Electronic circuitThe input current signal is received by electronic circuit and
compared to the output pressure from booster stage .a solid state
pressure sensor used strain gauge this film technology. It can
withstand loops of pressure w/o damage.
Magnetic actuator
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Elec stage Mag actuator Pilot stage Booster Valve
Solid state press
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The electronic circuit control the level of current flowing through
the actuator coil which is located in the pilot /actuator assembly. A
change to the level of coil current is to made by electronic circuit
when it senses a discrepancy between the pressure measured by the
sensor and pressure required by the input signal. The actuatorperforms the task of converting electrical energy to motion.
Pilot stageIt contains two opposed fixed nozzle. It also contains the deflector
which is moving element. The supply nozzle is connected to the
supply air stream. The receiver nozzle captures the air stream and
converts it back to pressure . the receiver nozzle pressure is the
output pressure of the pilot stage. In order to vary the pilot outputpressure the velocity stream is diverted away from the receiver
nozzle. This accomplished by the deflector which is cylindrical
aerodynamic body located between the two nozzle.
In response to a change in actuator coil current, the deflector is
repositioned between the nozzle. There is a linear relationship
between the coil current and the pilot stage output pressure . the
power of f or fail safe , the position of the top of the deflector isnear to the centre of stream and results in zero pilot output
pressure. As the coil is energized , the deflector is drawn out of the
stream. maximum pilot output pressure results when the deflector
has moved completely out of the stream.
The deflector material is tungsten carbide and nozzle are 316
stainless steel. The nozzle has a large bore of 0.016 inches which
provides good resistance to plugging.
Booster stageThe receiver nozzle pressure controls the booster stage which has a
poppet valve design. An increase in the transducer output signal.
A decrease in the receiver nozzle pressure positions the valving in
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the booster stage to allow the exhaust to occur, decreasing the
output signal.
CONCLUSION
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It can be concluded that BILT is a modernized and well-equipped
industry form every aspect whether it is manufacturing process or
finishing process. During my training period, I got valuable
knowledge regarding the most modern techniques used in
Electronics & Instrumentation trade that is P.L.C &Microprocessors .My training also made me familiar with many
machines & instruments used in industry. The management &
employees are very helpful. I hope that the valuable knowledge I
have gain here will help me in future.