Date post: | 12-May-2015 |
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Technology |
Upload: | sakshi-vashist |
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Yard + Chipper House
Pulp MillStock
Preparation Area
Paper machine
Finishing + Shipping
Area
• Head box level and pressure control.• Level Control of Seal Pit Tank.• Differential Pressure of Kuster in Calendar Section.• Steam Pressure control in Pre- Dryer.• Steam Pressure Control in Post-Dryer through QCS
system.• Measurement of GSM, Moisture and ash in the
paper through Smart Gauge 3000.• Hydraulic Presses and Drum Reel Hydraulic
System.• Measurement & control of Speed through Inductive
Proximity Sensor.• Photocell detector to detect Paper breakage.
4-20 mA
IP- Current to Pressure Converter
SP- Set Point
PV- Process Value
PCV- Pneumatic Control Valve
LIC- Level Indicating Controller
VFD- Variable Frequency Drive
LT- Level Transmitter
PT- Pressure Transmitter
0.2 To 1 kg/cm2Air Supply 1.4 kg/cm2
Fan Pump VFD
Head box
IP
PT
PIC
LT
LIC
LP
HP
Inlet Pulp
PCV
Air Drain
SP
4-20 mA
PV
Air from Air Receiver
Air Supply 1.4 kg/cm2
0.2 To 1 kg/cm2
4-20 m A
4-20 m A
PumpLIC
IP
White Water Inlet
SP
PV
PCV
OUTLET to Back Water Silo
PCV- Pneumatic Control Valve
IP- Current to Pressure Converter
LIC- Level Indicating Controller
LT- Level transmitter
• Inlet White water to Seal Pit is coming from the filtered pulp through wire. It is installed at the bottom of wire part. At the output a pump is used to sent white water to Silo via Pneumatic Control Valve
LTTank
Components:
GSM Radioactive material Ash X rays Moisture measurement IR sensor Edge Sensor Phase Encoder Limit Switch
Electrometer
Signal
Isotope Source
Process
Ground
High Voltage
+
-
Ion Chamber
Sensor Source (Example
ION Chamber)
Electrometer (current is amplified & converted to voltage)
ADC Intelligent Micro Controller (IMC)
RS-232 to RS-422 Converter
Raw CountsRS-422 to RS 232 Converter
Smart PC
Turbo PC/ Super PC
X-Ray Source
Process
SP
Air Supply (1.4 kg/cm2)
Close Tank
IP LIC
LT- Level Transmitter
PCV- Pneumatic control Valve
LIC- Level Indicating Controller
IP- current to pressure converter
PCV 4-20 mA
4-20 m A
LP
HP
Outlet
Inlet
LT
FIC
SP PV
PCVPCV
FTFT
Wild Flow Controlled Flow
4-20 mA
IP
1.4 kg/cm2
0.2 to 1 kg/cm2
Wild Flow X (Controlled Flow / Wild Flow)
SP =
4-20 mA Remote Transmission
220 V 50 Hz
PG1
Three Phase Motor (469 Hp)
Triple Disc Refiner
Flow Tube
Magnetic Flow indicator +Transmitter
PG3
PS1
PG4
PG2
PS2
Inlet from Buffer Chest
O/p Voltage
Interlock A
Water
Interlock B
Excitation voltage
Interlock A: if the Pressure of Inlet flow will goes below 0.5 kg/cm2 then Pressure switch PS1 unload the TDR
Interlock B: if the pressure of Water (which is acting as coolant to TDR )fall below 0.5 kg/cm2 then PS2 unload the TDR
Outlet to Refined Stock
Number of Boilers - 7
Coal Fired - 4
HP Boiler 1,2,3 & 7
Black Liquor Fired 2
ABL and JMW
Boiler # 7 (Coal
Fired) (OPP)JMW (Black
Liquor) (OPP)ABL (Black
Liquor) (NPP)
BTH
(6.2 M
W)
PRV- Pressure Reduce Valve
MP- Medium Pressure
46 kg/cm2
Header From HP steam Header (from PRV)
MPMP MP
Boiler # 1 (Coal Fired)
Boiler # 2 (Coal Fired)
Boiler # 3 (Coal Fired)
TG
(18 M
W)
PRV 46 Kg/cm2 to MP steam header
85 kg/cm2
Header
PRV- Pressure Reducing Valve
HP HP HP
PDM Tank
Deareator Tank
Feed Pump
Economiser Steam Drum
MUD Drum
Super Heater Section
Stop ValveTurbine
DM Plant
Condensate
Boiler
Deareator Tank
TG
IP
LIC
PG
IP LICSteam Inlet
Inlet from PDM tank thru Pump
PCV
Air Supply 20 psi
4-20 mA
SPLP
HP
Outlet to feed pump
SP Drain
20 psi
PCV
TG- Temperature GaugeLIC- level Indicating ControllerPT- Pressure transmitterPG- Pressure GaugePCV- Pneumatic Control ValveLT- Level TransmitterIP- Current to Pressure Converter
LTPT
Steam Flow Drum Level Water Flow
P+I
A T
P+I
A T
IP1.4 kg/cm2
To feed Water Control Valve
4-20 mA
Three Element Control...Drum Level
Types of transmitter:
Conventional Smart/Intelligent
Transmitter is a device which is used to measure physical variable i.e. transducer and to transmit signal into electrical signal in form of 4-20 mA or 1-5 V DC signal.
In this Calibration can be done after disconnecting the Transmitter from the field. In this calibration cannot be done using HART communicator. A Conventional Transmitter consists of Zero and Span Adjustment for the calibration
Disconnect Transmitter from the field.Apply 24 V dc supply and a multi meter in series
to the transmitterApply a known Pressure through Pressure gauge or
dead weight tester.Check zero of the transmitter. For zero pressure a
transmitter gives 4 mA. If transmitter shows some zero error then calibrate it through zero adjustment.
Apply 100% Span Pressure & then adjust 20 mA from the Span adjustment.
Check mA output for mid range pressure.
• In this Calibration can be done by using HART (Highway Addressable remote transducer) Communicator. Online calibration can be performed using HART communicator. In this Sine wave frequency signal over right the Previous Calibration.
• HART is based on Frequency Shift Keying. In this 1200 Hz is equal to Binary logic 0 and 2200 Hz is equal to logic 1.
Its working principle is based on the flapper nozzle arrangement. Its input range of pressure is 20 psi or 1.4 kg/cm2. Depending upon the control signal i.e. 4-20 mA a flapper moves up and gives output in the range of 3 to 15 psi or 0.2 to 1 kg/cm2.
Flapper
Supply Pressure 20 psi Restriction
Spring
4-20 mAGap
Pressure signal 3-15 psi
Nozzle
1. Apply input pressure of 20 psi and also apply current signal from mA source (Loop Analyzer).
2. Attach a manometer or calibrated gauge at the output of IP.
3. Apply 4 mA and check output pressure to be 3 psi or 0.2 kg/cm2. If this pressure will not come then adjust using zero adjustment.
4. Apply 20 mA signal and check o/p pressure to be 15 psi or 1 kg/cm2. If this pressure will not come then adjust using span adjustment.
5. Check for mid ranges by changing control signal to 8, 12 & 16 mA.
6. If step 5 is not showing exact reading then repeat step number 4, 5 & 6.
Flow in any pipe is defined as velocity of liquid at certain point.
Various flow measuring techniques are available and some are enlist which are used here
1. Orifice Plate 2. Venturi Meter3. Flow Nozzle4. Vortex Flow meter5. Magnetic Flow meters1,2 & 3 are Differential Pressure type flow
meters.
PIDSteam
Pr. Control
Feed Forward
Feed Forward
PID Ash Flow Control
CPU
PID
Feed Forward
Stock Flow ControlDTC
Feed Forward
Feed Forward
QCS
Ash S.P
Moisture S.P.
BW S.P. Consistency Tx
QCS PROCESSING FLOW DIAGRAM
V=2 ∏ R N
V= D ∏ N
∏D=V/N
V= Line Speed of the Drum from the Encoder (Taken from the Drive 01-10 VDC)
N= Unwind Speed from the proximity (14 ppr)
R= Radius of the Unwind Roll
D= Diameter of the Unwind Roll
Instrumentation is the branch of science which deals with the measurement, record and control of process variable.
ABB MP-200 Series Distributed Control System in Pulp Mill
Supervisory Control And Data Acquisition System used in Stock Preparation Area at PM4 and at ABL Boiler.
Quality Control System at PM1, 4 and 5. PLC Control System at PM7 and Color
Kitchen. Various Types of Field Instruments like
Level Transmitter, Pressure Transmitter, Flow Transmitter, Conductivity Transmitter and Consistency Transmitter, Temp.Transmitter.
Various Types of Control Valve for Pressure, temperature and flow Control application like Butterfly, Globe Valve, Plug valve
Others measuring devices like RTD, Thermocouple, pH measurement, Khajani for brightness Measurement.
Hydraulic System of Press part. Vibration Monitoring.
These Instruments are Calibrated Against the ISO from ETDC.
Loop Analyzer Dead Weight Tester Vacuum Gauge Tester RTD Simulator Conductivity Jig
Governer Control System for the Turbine Generator.
Temperature and Vibration Monitoring for Safety and Tripping.
Dereator Tank Level and Pressure Control at HP Boilers.
Feed Water Flow and Steam Flow Measurement and Control at all Boilers
Three Element Drum Level Control for HP Boilers
761 controller based SCADA control system at ABL Boiler.
Various Temperature Indication, ID indication.
Various Pressure and Flow measurements and Control like Soot Blowing Pressure and Flow.
Various types of Control Valve for different application like Flow Control of Feed water, Steam flow etc.
Conductivity measurement at DM plant and Evaporator.
Thank You !