ANNEXURE-C

C-1 SAMPLE CALCULATION FOR DETERMINATION OF FUEL CONSUMPTION FOR A TYPICAL DAY FOR STEAM GENERATOR - TURBINE GENERATING STATION.

(A) DATA

1. Installed Capacity    2 x 130 MW
2. Main Steam Parameters    130 kg/cm (abs), 535C/535C
3. Type of cooling Closed Cycle with cooling tower
4. Primary fuel Domestic coal (run off mine)
(a) Monthly weighted average
Characteristics of coal as
Received basis
(i) Moisture content   10%
(ii) Ash Content 35%
(iii) Hydrogen content 2.86%
(iv) GCV 4200 kCal/kg
5. (a) GCV of secondary fuel oil 10,000 kCal/kg
(b) Density of Secondary fuel oil  0.9 kg/l
6. Net Generation/day 5 million kWh
Guaranteed Net Heat Rate of Steam Turbine -Generator
7(a) Loading (%) 100            80 60 50
7(b) Guaranteed Net Heat Rate (kCal/kWh)
(as per EPC contract) as per para B-1.12.1 for ash, moisture and hydrogen content of primary fuel 
2525   2565 2680 2760
(B) CALCULATIONS 2 x 130 MW = 260 MW
1. Installed capacity

2. Normative Aux. Energy Consumption
at 100% Installed Capacity

9%
3. Net Installed Capacity

2x130 (100-9) = 236.6 MW
            100

4. PLF based on net generation 5 x 106 x 100 = 88.05%
   236.6x103x24
5. PLF based on gross generation and auxiliary Energy consumption is to be calculated by iteration upto 3 :
Iteration 0 1 2
PLF 88.05 88.47 88.46
AEC multiplying factor (from table at para 1.1.5.1.3

1.0+0.08(100-88.05)
      ----------------
                 20

= 1.0478

      0.08(100-88.47) 1.0+----------------
              20

= 1.0461

       0.08(100-88.46)
1.0+------------------
              20

= 1.04616

AEC(%) (from table at para 1.1.5.1 9x1.0478=9.4302 9x1.0461=9.4149 9x1.04616=9.4154

Gross Generation(kWh)

5x106
100-9.4302

100      

=5.52x106

5x106
100-9.4149
100

=5.5197x106

5x106
100-9.4154
100

=5.5197x106

Revised PLF (%)

5.52x 106
260x24

= 88.47

5.5197x 106
260x24

= 88.46

5.5197x 106
260x24

= 88.46

6. Gross Heat Rate of Steam Turbine Generator
Normative Gross Heat Rate from table
at Para 1.1.4.1
2080+ (2120 - 2080) x 100-88.46
                                     20
2103.08 kCal/kWh
7. GCV as 'fired' basis :
GCV as ‘received’ basis  4200 kCal/kg
GCV on as fired basis
(as per para -1.1.4.1.1)
4200-100 = 4100 kCal/kg
Moisture content on as received basis  10%
Moisture content on as fired basis
(as per para -1.1.4.1.1)
10 + 1 = 11%
8. Steam Generator Efficiency :
Steam Generator Efficiency as per formula
at para 1.1.4.1.1 
92.5-(50x35+630(11+9x2.86)
                 4100
= 92.5-6.07 = 86.43%
9. Net Heat Rate
Normative Gross Heat Rate 2103.08 kCal/kWh
Normative Aux. Energy Consumption 9.415%
Normative Steam Generator Efficiency 86.43%
Normative Daily Net Heat Rate
(from formula at Para B- 1.12.1)
2103.08 x 100       100
-------------- X ------ = 2686 kCal/kWh
100 - 9.415         86.43
Daily Net Heat Rate based on
guaranteed value
(from item 7 of Data)
2525 + (2565-2525) (100-88.46)
                                 20
= 2548 kCal/kWh
Daily Net Heat Rate based on
guaranteed value with
degradation factor of 1.05
2548 x 1.05 = 2675 kCal/kWh
Applicable Daily Net Heat Rate 2675 kCal/kWh
10. Heat Credit of Secondary Fuel Oil :
Fuel Consumption Specific secondary
fuel oil consumption (as per para 1.1.6)
1.0 ml/gross kWh
   1.0
--------- =1.104 ml/net kWh
100-9.415
Allowable fuel oil consumption 5 x 106 x 1.104
--------------------- = 5.52 kl/day
     10
6
GCV of fuel oil 10,000 kCal/kg
Heat contribution of secondary fuel oil 5.52 x 10x 0.9x 10,000 kCal/day
= 49.71 x 10
6 kCal/day
or 0.0497 x 10
9 kCal/day
11. Heat input to generating station 5x106x2675 kCal/day
= 13.375 x 10
9 kCal/day
12. Heat input by coal (13.375 - 0.0497) x 109 kCal/day
13.3253x10
9 kCal/day

13. Coal consumption

GCV of coal on as fired basis 4100 kCal/kg
Coal Consumption 13.3253 x 109
------------------ kg/day                                     4100
= 3.250 x 10
6 kg/day
= 3250.0 tonnes/day
14. Total fuel consumption 3250.0 t/day of coal + 5.52 kl/day of
Secondary Fuel Oil

C-2 SAMPLE CALCULATIONS FOR DETERMINATION OF FUEL CONSUMPTION FOR A SETTLEMENT PERIOD FOR COMBINED CYCLE COMBUSTION TURBINE (CCCT) GENERATING STATIONS

CASE I : NATURAL GAS AS FUEL (FIRST YEAR OF OPERATION)

A) DATA

1. First year Installed Capacity  350 MW (2 x 115 MW CT +1 x 120 MW ST)
2. Combustion Turbine rating at ISO
with Natural gas
123 MW
3. Type of cooling Closed Cycle with cooling Tower
4. a) Fuel Natural Gas
b) NCV of fuel 8500 kCal/SM
5. NOx control measure
(NOx emission level 50 ppm)
Water injection
6. Settlement Period 1 Hour
7. Net generation during the
Settlement Period
270830 kWh
8. a) Loading 100% 80%  60% 50%
b) Guaranteed Net Heat Rate (kCal/kWh)
as per EPC contract for Natural Gas with
water injection under site ambient conditions
1800 1860 1990 2100
B CALCULATIONS
1. Installed capacity 350 MW
2. Normative auxiliary
Energy consumption
2.85%
3. Gross Generation during the Settlement
Period

  270830        27830     100
--------- = -------- x            =  278775 kWh
  (100-2.85)   97.15
-----------
    100

4. SPLF 278775 X 100 = 79.65%
--------
350X10

5. Net Heat Rate for the Settlement Period (SNHR) :

5.1 Normative Net Heat Rate for the Settlement period

(a) Normative Gross Heat Rate (GHR) under ISO conditions as per para 1.1.3.2.1 corresponding to SPLF of 79.65% with Natural Gas as fuel. 1730 + (1850 - 1730) X (80-79.65)
               20
= 1732.10 kCal/kWh
b) Adjustment for water injection as per
Note 2 under 1.1.3.2.1
100 kCal/kWh

c) Normative GHR under site ambient conditions (Refer B-2.5.2.1)
(Assuming 1.025 as a factor based on manufacturer's curves for deviations of site ambient conditions (temperature, relative humidity, atmospheric pressure, condenser vacuum) from ISO conditions

(1732.10 + 100 x 1.025)
= 1877.90 kCal/kWh
d) Normative Net heat rate for the Settlement Period 1877.90 x 100
-------
100-2.85
= 1932.99 kCal/kWh
5.2 Net Heat rate for the Settlement Period based on guaranteed value (Item 8 of data) { 1860 + (1990 – 1860) x (80-79.65)} 1.035
                     20
= 1927.45 kCal/kWh

5.3 Applicable Net heat rate (SNHR) for the settlement period

1927.45 kCal/kWh

6. Fuel consumption during the Settlement Period

6.1 Heat input 270830 x 1927.45 kCal
= 522.011 x 10
6 kCal
6.2 NCV of Natural Gas item 4 (b) of data 8500 kCal /Sm
6.3 Gas consumption during the Settlement Period 522.011 x 106       =   0.061413 x 106 Sm
    8500

                                                                                                                          

CASE II : NATURAL GAS AS FUEL (FOURTH YEAR OF OPERATION)

A) DATA

1. First year Installed Capacity 350MW(2x115MWCT+1x120 MW ST)

2. Combustion Turbine rating at ISO with Natural Gas

123 MW
3. Type of Cooling Closed Cycle with cooling Tower
4. a) Fuel Natural Gas
b) NCV of fuel 8500 kCal/SM
5. NOx control measure
(Nox emission level 50 ppm)
Water injection

6. Settlement Period

1 hour
7. Net generation during the settlement period 264570 kWh
8. a) Loading 100% 80% 60% 50%
b) Guaranteed Net Heat rate (kCal/kWh)
as per EPC contract for Natural Gas with
water injection under site ambient conditions
1800 1860 1990 2100

B CALCULATIONS

1. a)Installed capacity 350 MW

b) Capacity degradation factor for 4th year

0.9775
c) 4th year Installed Capacity 350 x 0.9775 = 342.125 MW

2. Normative auxiliary energy consumption

2.85%
3. Gross Generation during the Settlement
Period
264570        264570
--------- = -------- x 100 = 272331 kWh
(100-2.85)    97.5
-----------
  100
4. SPLF    272331     X 100 = 79.60%
342.125X10

5. Net Heat Rate for the Settlement Period (SNHR)

5.1 Normative Net Heat Rate for the Settlement period

(a) Normative Gross Heat Rate (GHR) under ISO conditions as per para 1.1.4.2.1 corresponding
to SPLF of 79.60% with Natural Gas as fuel
1730 + (1850 – 1730) x (80-79.6)
                20
= 1732.40 kCal./kWh
b) Adjustment for water injection as per Note 2 under 1.1.4.2.1 100 kCal/kWh

c) Normative GHR under site ambient conditions (Refer B-2.5.2.1)
(assuming 1.025 as a factor based on manufacturer's curves for deviations of site ambient conditions (temperature, relative humidity, atmospheric pressure, condenser vacuum) from ISO conditions

(1732.40+100)x1.025
= 1878.21 kCal/kWh
c) Normative Net heat rate for the Settlement Period 1878.21 x 100
          100-2.85
= 1933.31 kCal/kWh
5.2 Net Heat rate for the Settlement Period based on guaranteed value
(Item 8 of data)
{ 1860 + 1990 - 1860 x (80-79.60) } 1.035
                     20
= 1927.79 kCal/kWh

5.3 Applicable Net Heat Rate (SNHR) for the settlement period

1927.79 kCal/kWh
6. Fuel consumption during the Settlement Period
6.1 Heat input 264570 x 1927.79 kCal
= 510.035 x 10
6 kCal
6.2 NCV of Natural Gas item 4 (b) of data 8500 kCal /Sm
6.3 Gas consumption during the Settlement
Period
510.035 x 106
8500
= 0.060004 x 106 Sm


CASE III : NAPHTA AS FUEL (FIRST YEAR OF OPERATION)

A) DATA

1. First year Installed Capacity 680MW(2x225MW CT+1x230 ST)

2. Combustion Turbine rating at ISO with
Natural Gas

240 MW
3. Type of Cooling Once through system
4. a) Fuel Naphtha
b) NCV of fuel 10500 kCal/kg

5. NOx control measure
(NOx emission level 75 ppm)

Water injection
6. Settlement Period 1 hour

7. Net generation during the Settlement Period

562370 kWh
8. a) Loading 100% 80% 60% 50%

b) Guaranteed Net Heat rate (kCal/kWh) as per EPC contract for Naphtha with water injection under site ambient conditions

1700 1750 1850 1950
B CALCULATIONS
1. a)Installed capacity 680 MW

2. Normative auxiliary energy Consumption

2.75%
3. Gross Generation during the Settlement
Period
562370        562370     100
--------- = -------- x        =578272 kWh
(100–2.75)    97.25
----------
100
4. SPLF 578272 X 100 = 85.04%
680X10
5. Net Heat Rate for the Settlement Period (SNHR)

5.1 Normative Net Heat Rate for the Settlement Period

(a) Normative Gross Heat Rate (GHR) under ISO conditions as per para 1.1.4.2.1 corresponding
to SPLF of 85.04% with Natural Gas as fuel.
1580 + (16300 - 1580) X 100-85.04
               20
= 1617.40 kCal/kWh

(b) Normative Gross Heat Rate (GHR) under
ISO conditions with Naphtha as fuel

1617.40 x 1.02
= 1649.75 kCal/kWh
(c) Adjustment for water injection as per Note 2 under para 1.1.4.2.1 50 kCal/kWh for emission level
100 ppm
= 50x100  kCal/kWh for emission level 
     75     of 75 ppm
= 66.67 kCal/KWh
d) Normative GHR under site ambient Conditions (Refer 1.1.4.2.1)
(Assuming 1.025 as a factor based on manufacturer's curves for deviations of  site ambient conditions (temperature relative humidity, atmospheric pressure, condenser vaccum) from ISO conditions
(1649.75 + 66.67) x 1.025
= 1759.33 kCal/kWh
e) Normative Net Heat Rate for the Settlement Period 1759.33x100
100-2.75
= 1809.08 kCal/kWh
5.2 Net Heat Rate for the Settlement Period based on guaranteed value
(Item 8 of data)
{1700 + (1750-1700) x (100- 85.04)} 1.035
                20
= 1798.21kCal/kWh

5.3 Applicable Net Heat Rate (SNHR) for the Settlement Period

1798.21 kCal/kWh

6. Fuel Consumption during the Settlement Period

6.1 Heat input 562370x1798.21 kCal
= 1011.259x10
6 kCal
6.2 NCV of Naphtha
(Item 4(b) of data)
10500 kCal/Sm3
6.3 Naphtha consumption during the settlement period 1011.259 x 106
10500
= 0.096310x10
6 Kg
= 96.310 tonnes

                                                        

[Next Page]


[Home] [About Us] [Extracts of Acts]
[Regulations][Orders] [Publications] [Power Data] [Annual Report]
[Schedule of Hearings][Bulletin Board] [Jobs] [Contact Us] [Search] [Links]