7/29/2019 43966690 Turbine Heat Rate Calculation 210 Mw

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Sub. Calculation of Heat Rate (Enthalpy Method) for 210 MW KWU turbine.

Date: 4.11.2010 LOAD 160 MW Time 17.15 Hrs

Calculation of Heat Rate by Enthalpy method

The following readings are to be taken keeping load constant.

S.No. TAG No. Description TAG No.at site Value

1. MST Main steam flow to turbine BFQ0001

.TG158 of DCS

541 T/HR

2. MWC Mega watt Generated BW0003.TG158 of DCS

160 MW

3. FMS Main Steam flow (L+R) N.A.(Same as MST)

4. PMST Main Steam Pr. At turbineinlet

M.S.and HRH Pr.Trend page 2 of WSPOSE

109 Kgf/cm106.8 bar

5. TMST Main Steam temp.at turbine

inlet

M.S.and HRH Temp.

Trend page 301 of WSPOSE

534.85oc

6. PFW Feed water pressure at

economizer inlet

FP 1013 123.3Kgf/cm

120.5 bar

7. TFW Feed water temp.ateconomizer inlet.

FT 0001 230.0oc

8. PHRH HRH.PR M.S.and HRH Pr.Trend page 2 of WSPOSE

29.31 Kgf/cm28.7 bar

9. THRH HRH TEMP M.S.and HRH Temp

Trend page 3 of WSPOSE

526oc

1

0.

PCRH CRH.PR M.S.and HRH Pr.

Trend page 2 of WSPOSE

30.85 Kgf/cm

30.2 bar

11.

TCRH CRH TEMP RT1001 & BT1007Graphics of page 51 of DCS

360oc

1

2.

FRHS Reheater spray flow (L+R) BF1001 & BF1002

Graphics of page 100 of DCS

26 tons/Hr.

1

3.

FFW Feed flow at economizer inlet FFQ 001

Graphics of page 47 of DCS

530 tons/hr

1

4.

PEH6 Extraction PH QT HPH6 inlet XP 1009

Graphics of page 42 of DCS

30.85 Kgf/cm

30.2 bar

15.

TEH6 Extraction Temp QT HPH6inlet

XT 1003Graphics of page 42 of DCS

365oc

1

6.

TDH6 Drain Temp at HPH6 DT 1001

Graphics of page 44 of DCS

196.0 oc

1

7.

TFWHO6 Feed water temp at HPH6

outlet

FT 1003

Graphics of page 44 of DCS

230.0oc

1

8.

TFWHI6 Feed water temp at HPH6

inlet

FT 1204

Graphics of page 44 of DCS

190.0oc

19.

PBFD BFP HDR PR. FP 1010Graphics of page 37 of DCS

139 Kgf/cm136.2 bar

Note :- The pressure unit in Instrument is in Kg while in steam table it is in bar.

Hence conversion factor is

1 Kgf/cm= 0.98 bar

Similarly in steam table enthalpy unit is KJ/ Kg while we need enthalpy unit in KCL/Kg.

hence conversion factor1 KJ = (1 / 4.1868) X KCL

7/29/2019 43966690 Turbine Heat Rate Calculation 210 Mw

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CALCULATION OF ENTHALPY

HMST= Enthalpy of Main Steam to turbine , Pr. and Temp needed are:-Pr.. to turbine inlet (PMST)= 106.8 bar

Temp. to turbine inlet (TMST) = 534.85oc

The enthalpy read in Mollier chart=3450 KJ/Kg=3450 X 1 KCL/Kg

4.18

HMST = 821. 1 KCL/Kg

HFW= Enthalpy of feed water of economizer inlet, PR and Temp needed are:-Feed water PR. To Economizer inlet (PFW)= 120.5 bar

Feed water PR. To Economizer inlet (TFW)= 230.0oc

The enthalpy read in Steam table corresponding to temp.= 230.0oc oc =1492 KJ/Kg=1492 X 1 KCL/Kg

4.18

HFW=235.62 KCL/Kg

HHRH= Enthalpy of HRH steam , PR and Temp. needed are:-

HRH steam PR. (PHRH) =28.7 bar

HRH steam Temp. (THRH) =526oc

The enthalpy read in molier chart =3510 KJ/Kg

=3510 X 1 KCL/Kg4.18

HHRH=835.38 KCL/Kg

HCRH= Enthalpy of CRH steam , PR and Temp needed are:-

CRH steam PR. (PCRH) =30.2 bar

CRH steam Temp. (TCRH) =360ocThe enthalpy read in molier chart =3100 KJ/Kg

=3100 X 1 KCL/Kg

4.1868HCRH=737.8 KCL/Kg

HEH6= Enthalpy of extraction steam to HPH6, PR and Temp needed are:-

Extraction steam Pr. To HPH6(PEH6) =34.69 barExtraction steam Temp To HPH6(TEH6) =350.4ocThe enthalpy read in molier chart =3100 KJ/Kg

=3100 X 1 KCL/Kg

4.1868HCRH=737.8 KCL/Kg

HDH6= Enthalpy of extraction steam to HPH6 , PR and Temp needed are:-

Extraction steam Temp To HPH6(PEH6) =30.2 barDrain steam Temp To HPH6(TDH6) =196oc

The enthalpy read in steam table corresponding to temp =196oc =1008.4 KJ/Kg

=1008.4 X 1 KCL/Kg

4.1868HDH6=239.99 KCL/Kg

HFWHO6= Enthalpy of steam feed water to HPH6 outlet, PR and Temp needed are:-

BFP discharge header PR (PBFD) =136 barTemp.of feed water of HPH6 outlet(TFW HO6) =230oc

The enthalpy read in steam table corresponding to temp =230oc =990 KJ/Kg

= 990 X 1 KCL/Kg4.18

HFW HO6=235.62 KCL/Kg

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HFWHI 6= Enthalpy of steam feed water to HPH6 outlet PR and Temp needed are:-

BFP discharge header PR (PBFD) =136 barTemp.of feed water of HPH6 inlet(TFW HI6) =190oc

The enthalpy read in steam table corresponding to temp =190oc =807 KJ/Kg

=807 X 1 KCL/Kg4.18

HFW HI6=192.06 KCL/Kg

CALCULATION OF HEAT RATE

FEH6 = Flow of Extraction steam to HPH6FEH6 = FFW X (HFW HO6 HFW HI6)

(HE H6 HDH6)

=Feed flow to economizer inlet X(Enthalpy of feed water of HPH6 outlet Enthalpy of feed water of HPH6 inlet)

(Enthalpy of Extraction Steam of HPH6 Enthalpy of Drain water of HPH6 )

= 530 X ( 235.62 192.06)

737.8 239.99

= 530 X 43.56497.81

FEH6 = 46.37 tons / hrs

. FHRH = HRH Flow

=FHRH=FMS - FEH6 + FRHS

= Total main steam flow - flow of extraction steam to HPH6 + Total Reheater spray flow

= 541 46.37 + 26

FHRH =520.63 tons / hrs

. QT= heat input to turbine cycle= FMST(HMST-HFW) X 1000 + FHRH ( HHRH HCRH) X 1000

=+ Hot Reheat flow X (Enthalpy of HRH steam - Enthalpy of HCRH steam)X1000

= 541(821.1-235.62)X1000+520.63 (835.38-737.8)X1000

=541 X (585.48) X 1000 +520.63 (97.58) X 1000

=316744.68 X 1000 + 50803X 10000

=367547.68 X 1000 KCL /HRTurbine Heat Rate = ( QT)

1000 X MWG (Where MWG=MW generated)

= 367547.68 X 1000

1000 X 160=2297 KCL / KWH

Hence, Turbine Heat Rate =2303.8 KCL / KWH

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