GHE (Gas Heat Exchanger) LT ECO PPT.pdf

7/30/2019 GHE (Gas Heat Exchanger) LT ECO PPT.pdf

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GREENS

Steel H Economizer

And

Gas Heat Exchanger


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Steel H Tube is extended surface tube

with H shaped Plate Fins fused to the

tubes

Extended surface assists improved

heat transfer rates

About 2 to 4 times increased Heating

Surface Area than plain surface in unit

volume of Space


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Advantages of Steel H

Compact Size

Low Pressure Loss

Less Tubes and Weight

Lower Costs

Proven Heat Transfer Rates

Double H Inherent Stiffness


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Low Temperature Economizers are the

Steel H Economizers used at Up or

Downstream of ESP

Generally called as GAS HEAT

EXCHANGER (GHE) for Power StationBoilers

GHE are used to enhance the systemefficiency


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Objectives of GHE

Reduces the exhaust gastemperature from 160 ~ 170 Deg Cto about 120 Deg C

GHE shall assist to reduce the inletgas temperature of

1. Desulphurization / Denitrificationequipment

2. Next generation ESPs


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Methods

of Incorporation


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Placed between ID Fan and FGD

Heat from the flue gas is used to heat

water Hot water drives Vapour Absorption

Heat Pump

VAHP produces chilled water for

central air conditioning

GHE

FGDID FanESP

Stack

FD Fan

APH

TO DRIVE VAHP FOR CENTRAL AIR

CONDITIONING


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GHE 1

FGDID FanESP

Stack

FD Fan

GHE 2

GHE 1 is Placed between ID Fan and FGDGHE 2 is Placed before ESP


water by GHE 1 and then by GHE 2

Hot water is used to drive VAHPVAHP provides chilled water for

Central Air Conditioning

Hot water can also be sent directly to

main economizer

APH

TO DRIVE VAHP FOR PRODUCING

CHILLED WATER


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GHE FGDID FanESP

Stack

FD Fan


Heat from the flue gas is used to heatwater

Hot water then heats the air from

Primary Air Fan

APH

TO PREHEAT THE AIR


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GHE

FGDID FanESP

Stack

FD Fan

APH



the over cooled flue gas after FGD The temperature of the flue gas is

controlled to maintain the temperature in

stack

TO MAINTAIN THE TEMP IN STACK


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GHE FGDID FanESP StackFD Fan

APH

FD FanSteam

Turbine

LP HeaterSteam Extracted

from Turbine

Condensate Inlet

Condensate

Outlet

Steam Condensate

Outlet

Placed between ID Fan and FGD Heat from the flue gas is used to

condensate from turbine

Hot condensate is then joined with the

outlet of LP Heater

TO HEAT THE STEAM CONDENSATE


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GREENS

Steel H EconomisersSupplied

ININDIA


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BALCOKORBA

270 MW BCPP (4 X 67.5 MW)

4 x 275 TPH Boilers

3 units installed

1 unit to be installed in next shutdown

Performance of proposed design provides

additional 10% duty


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Existing Economiser GreensEconomizer

Type of Surface Unit Finned TubeCombination of Finned &

Plain Tube

Number of Plain Tubes 0 112

Number of Finned Tubes 896 1232

Finned Length Mm 4280 4250

Tubes High 16 24

Tubes Wide 56 56

Water Paths 56 56

No. of Tiers 3 2

Tube diameter mm 51 44,5

Tube thickness mm 4.5 avg (assumed) 4.5 min

Tube material BS3059-2, Gr 440 ASME SA210-C

Fin thickness mm 2 3

Fin pitch mm 18 25 (50 top bank)


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ExistingEconomiser

GreensEconomiser

Flue Gas TemperatureEconomiser inlet C 529 529

Economiser outlet C 398 384.5

Flue Gas Flow rate t/h 565.2 565.2

Flue Gas Velocity,

Eco Inlet, (avg)m/s 21

18.5

(inlet to bottom

bank)

Gas Draft Loss (overheating surface only)

mm WG 54 53

Feed Water Flowrate t/h 190 190

Economiser inlet bar 107 107

Feed Water Pressure

Loss (friction only) bar 0.2 0.6

Feed WaterTemperatureEconomiser inlet C 209 209

Economiser outlet C 300 308

Heat Duty MW 23.6 26


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Essar ESSAR, VADINAR 77 MW COGEN PLANT

Total 3 units. 1 unit under installation

Next 2 units will be installed in Next shut downs

Boiler 175 TPH Babcock Make

OPERATING PRESSURE 81.5 KG/Cm2TEST PRESSURE 122.25 KG/Cm2WATERInlet Temperature 175 COutlet Temperature 256 CFLUE GASInlet Temperature 500 COutlet Temperature 210 CTOTAL HEAT DUTY 17900 KW


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Size Material

TUBEDIA 38.0 MM OD X

3.2 MM THICKNESS

DIN 17175 St 35.8 III(EQUIVALENT

SA 210 A-1)

HEADER PIPE DIA 219.1 OD X14.2 MM THICKNESS

DIN 17175 15Mo3

(EQUIVALENT

SA 335- P1)

FINSSIZE 150 MM LONG X

2 MM THICKNESS

DIN StW 22

44 NOS OF

FINNED COILSPITCH 75 MM


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Economizer at our

factory


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Economizer at our

factory


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Hindalco

RENUSAGRPOWER

DIVISION


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RENUSAGAR Thermal Power

Station 740 MW

1 unit 70 MW under OPERATION

Heating Surface 2840 m2

No of coils 57

Fin pitch 25 mm

Material

Tubes SA 210 Gr C

Fins JIS 3131 Gr SPHC


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Unit Existing ModifiedFeed Water t/hr 275 275

Economizer Inlet C 230 230

Economizer Outlet C 285 295

PressureKg/cm

(g)107 107

Total Pressure Drop (friction) Kg/cm 2.1 1.8

Flue Gas Flow rate T/hr 388 388

Flue Gas Temperature

Economizer Inlet 550 550

Economizer Outlet 375 340

Flue Gas Velocity

Maximum Gas Velocity m/s 10 10

Total Draft Loss

(Over Heating Surface Only)mm WG 24 24

Heat Duty MW 20.5 24.5


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Hindalco

Industries Ltd.Renukoot


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Unit Existing ModifiedFeed Water Flow Rate t/hr 90 90

Feed Water Temperature

Economizer Inlet C 99 99

Economizer Outlet C 117 135-145

Feed Water Pressure Kg/cm (g) 66 66

Total Pressure Drop (friction) Kg/cm 0.5

Flue Gas Flow rate T/hr 142.7 142.7

Flue Gas Temperature

Economizer Inlet 242 242

Economizer Outlet 174 135-140

Flue Gas Velocity

Economizer, Average m/s 8-9

Total Draft Loss

(Over Heating Surface Only)mm WG 25

Heat Duty MW 2.0 3.7-4.7


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ECO 1 to be replaced byGreens Steel H Economizer


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Eco 1 is used to heat the feed water


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VEDANTATalwandi Sabo Power Ltd.

3 x 660 MW thermal power plant

Plant at District Mansa, Punjab

Talwandi Sabo Power Limited is a

subsidiary of Sterlite Energy Ltd.

Boiler supplied by Harbin Boiler

Co Ltd.


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Gas Heat Exchanger

Supplied byGreens Power EquipmentIndia Pvt Ltd


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R.K.M.Powergen Pvt Ltd.Uchpinda, CG


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4 X 360 MW Thermal Power

Plant

4 Units of Gas Heat Exchanger

is Supplied

GHE will be used to driveVapour Absorption Machine of

capacity 4 x 200 TR

GHE is under installationphase


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Greens Offers

Process and Design analysis for feasibility

Waste Heat Recovery Techniques

without hindering in current operation

Cost saving methods by conserving the

valuable resources

Participation in making the plant environment

friendly


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Thank You

Date post:	14-Apr-2018
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GHE (Gas Heat Exchanger) LT ECO PPT.pdf

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