Guarantee Heat Rate Calculations 495s5f

GACL- DAHEJ CAPTIVE CO-GENERATION POWER PLANT CORRECTED GAS TURBINES OUTPUT CALCULATION ON SITE CONDITION

Corrected Sr.No

Description

Output in MW 38.34

1 2 3

At ISO condition of 15 deg C At Ambient temp of 39 Deg.Cent at Dahej SITE.

4

Decrease in output due to decrease in NCV Decreasein grid frequency from 50 Hz to 49.5 Hz

5

Decrease in output due to compressor fouling & Intake air filter losses 1.5%

Reference GE document related PG 6541 B ; Chart No. 499HA542 , Rev C

32.21

GE document related PG 6541 B ; Chart No. 499HA543 , Rev A

31.02

L&T HMPD , GT ID No. 49

30.71

Actual site conditions of Grid

30.25

GE document related PG 6541 B ; Chart No. 499HA542 , Rev C

CAPTIVE CO-GENERATION POWER PLANT GACL- DAHEJ POWER SALE TO GEB UNIT COST CALCULATION

Particulars

Unit

Naptha

Avg.Generation

MW

87.5

Guranteed NCV of Fuel

Kcal/Kg

9740

Kcal/Sm3 Sp.Fuel Consumption (based on Guarantee)

Kg/Kwh

Kcal/Kg

0.200 0.246 10300

Kcal/Sm3 Sp.Fuel Consumption (based on Actual)

Kg/Kwh

8300 0.189

Sm3/Kwh FSNL Fuel (Based on Actual)

Kg/Kwh

0.255 0.078

Sm3/Kwh Incremental Fuel Consumption

Kg/Kwh

0.098 0.111

Sm3/Kwh Cost of Fuel

Rs/Kg

87.5

8587.197

Sm3/Kwh Actual NCV of Fuel

N.Gas

0.157 11.305

Rs/Sm3

8.58

Incremental Fuel Cost

Rs/Kwh

1.257

1.344

Revenue from GEB

Rs/Kwh

3.00

2.25

Net Earning on Sale to GEB

Rs/Kwh

1.74

0.91

Net loss in Revenue on switchover from Naptha to N.Gas

0.84

N

GACL- DAHEJ CAPTIVE CO-GENERATION POWER PLANT GUARANTEE HEAT RATE CALCULATION UNIT 1 2 3 4 5 6

7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

FUEL Numbers of Gas Turbines Gas Turbine Power output. STG Power output Gross Power output Fuel flow per Gas Turbine. FSNL Fuel/GT Incremental Fuel/GT Sp.Fuel Consumption Sp.Fuel Consumption LHV Of Fuel Fuel heat per Gas Turbine. Total Fuel Heat. Process Steam Flow. Process Steam Parameters Process Steam Enthalpy Heat in Process STeam Make up Water Flow. Make up Water Temperature. Make up Water Enthalpy. Heat in Make up Water. Heat Rate (Guarantee) Heat Rate (Calculated)

Naptha KW KW KW Kg/Sec Kg/Sec Kg/Sec Kg/Kwh M3/Kwh. Kcal/Kg Kcal/Hr Kcal/Hr TPH Kcal/Kg Kcal/Hr TPH 0 C Kcal/Kg Kcal/Hr Kcal/KHr Kcal/KHr

2 33020 34870 100910 2.725 0.68 2.045 0.1944 10002 98118748 196237496 11 672.24 7394640 15.0 31 31 465000 1876.01

BASED ON HMBD SUPPLIED BY OEM (M/S.L&T) Naptha Naptha N.gas N.gas N.gas 2 2 2 2 2 33020 33020 33670 33670 33670 32120 25650 35174 32880 26490 98160 91690 102514 100220 93830 2.725 2.725 2.399 2.399 2.399 0.68 0.68 0.59 0.59 0.59 2.045 2.045 1.81 1.81 1.81 0.1999 0.2140 0.225 0.230 0.246 10002 10002 11465 11465 11465 98118748 98118748 99015315 99015315 99015315 196237496 196237496 198030630 198030630 198030630 26.1 60.0 11 26.1 60.0 13.73 bar , 204 OC 672.24 672.24 672.24 672.24 672.24 17545464 40334400 7394640 17545464 40334400 31 67.0 15.0 31 67.0 31 31 31 31 31 31 31 31 31 31 961000 2077000 465000 961000 2077000 1830.21 1722.98 1864.15 1810.48 1702.79

Calculation for 90 MW Calculation for 87.5 MW Naptha N.gas Naptha N.gas 2 2 2 2 30250 30250 29410 29410 29500 29500 28681 28681 90000 90000 87500 87500 2.622 2.216 2.569 2.171 0.70 0.59 0.70 0.59 1.92 1.626 1.87 1.58 0.2098 0.2114 0.237 0.239 9740 11465 9740 11465 91941693 91468477 90067887 89604114 183883385 182936955 180135773 179208229 11 11 11 11 672.24 7394640 15.0 31 31 465000

672.24 7394640 15.0 31 31 465000

672.24 7394640 15.0 31 31 465000

672.24 7394640 15.0 31 31 465000

1966

1956

1979

1969

Note:- Sp.Fuel Consumption on Naptha (Kg/Kwh) Sp.Fuel Consmp = Fuel flow per GT (Kg/Sec.) X 3600 (Convertion from Sec to Hr.) x 02 (Nos. of GT) / Total Power Generation Per Hour Sp.Fuel Consumption on N.Gas (sm3/Kwh) Sp.Fuel Consmp = Fuel flow per GT (Kg/Sec./ Density of N.gas) X 3600 (Convertion from Sec to Hr.) x 02 (Nos. of GT) / Total Power Generation Per Hour Where Density of N.Gas at 20 deg.Centigrade is considered = 0.749 Kg/M3

NCV of Naptha before fuel switch

9740 Kcal/Kg.

Calculation Sheet

Air Density at 0 deg. Centigrade :- 1.293 Kg/Met3.

Calculated Air density at 20 deg.Cent:- 1.293 x 273 / ( 273+20) = 1.20 Sp.Gravity of N.Gas at STP (15.5 Deg.Cent) :-0.62 Calculated density of N.Gas at 20 deg. Cent.:- 0.62 x 1.20 = 0.749

GUIDELINE FOR HEAT RATE CALCULATION : COMBINED CYCLE HEAT RATE = ( TOTAL FUEL HEAT + HEAT IN MAKE UP WATER - HEAT IN PROCESS STEAM ) / GROSS POWER OUTPUT

Calculation for 72 MW Naptha N.gas 2 2 24200 24200 23600 23600 72000 72000 2.237 1.891 0.70 0.59 1.54 1.30

Calculation for 63 MW Naptha N.gas 2 2 21175 21175 20650 20650 63000 63000 2.045 1.728 0.70 0.59 1.35 1.14

9740 78450290 156900580 11

0.252 11465 78045064 156090128 11

9740 71704588 143409177 11

0.264 11465 71333358 142666715 11

673.24 7405640 15.0 31 31 465000

674.24 7416640 15.0 31 31 465000

675.24 7427640 15.0 31 31 465000

676.24 7438640 15.0 31 31 465000

2083

2071

2166

2154