1. AS RUN ENERGY EFFICIENCY
ASSESSMENT OF HEAT RECOVERY
STEAM GENERATORS &TURBINES
OBJECTIVE:
• TO ASSESS THE AS RUN PERFORMANCE
OF HEAT RECOVERY STEAM GENERATORS
TOWARDS MAINT.PLG. AND UPKEEP
AS RUN MEASUREMENTS INVOLVED:
• G.T. AND S.T . OUTPUT MW
• Flue Gas TEMP AT HPSH INLET& OUTLET
• Flue Gas TEMP AT HP ECONOMISER INLET&
OUTLET
• Flue Gas TEMP AT LPSH INLET& OUTLET
• Flue Gas TEMP AT LP ECONOMISER INLET&
OUTLET
• Flue Gas TEMP AT LP EVAPORATOR INLET &
OUTLET
• Flue Gas TEMP AT COND.PREHEATER INLET&
OUTLET
• FEED WATER FLOW AND TEMP.
• PRESSURE & SUPER HEAT AT LP SUPER

2. HEAT RECOVERY STEAM GENERATORS
(Illustrative as run values)
S.No. ITEM REFERENCE VALUE
. G.T.OUTPUT MW 89.62
. S.T.OUTPUT MW 104.71
. H.P.STEAM FLOW TPH 161.00
. L.P. STEAM FLOW TPH 37.62
. H.P. STEAM PRESSURE BAR 64.75
. L.P. STEAM PRESSURE BAR 5.11
. H.P.SUPER HEATER TEMP.oC 517.00
. H.P.SUPER HEATER STEAM 827.00
ENTHALPY kCal/kg
. H.P. SATURATED STEAM 663.70
ENTHALPY kCal/kg
0. Flue Gas TEMP. HP SUPER HTR. 527.00
INLET oC
1. Flue Gas TEMP TO HPSH OUT 435/451
2. HEAT PICK-UP IN HPSH 26.291
(MkCal/hr)
Item 3*103(Item 8 - Item 9)

3. HRSG PERFORMANCE FEATURES
(Illustrative as run values)
S.No. ITEM REFERENCE VALUE
3. Flue Gas TEMP. AT HP EVAP. 435/451
INLET oC
4. Flue Gas TEMP. AT HP EVAP. 290/291
OUTLET oC
5. ECONOMISER-2 OUT WATER 280.90
ENTHALPY
6. HEAT PICK-UP IN H.P. 61.63
EVAPORATOR(MkCal/hr)
Item 3*103(Item 9 - Item 15)
7. Flue Gas TEMP @ HP ECON.-2 290/291
INLET oC
8. FG TEMP @ HP ECON.-2 225.00
OUTLET oC
9. WATER TEMP & ENTHALPY 106.90
@ HP ECON.1 INLET
0. HEAT PICK-UP IN H.P. 28.01
ECONOMISERS-1 &2
(MkCal/hr)
Item 3*103(Item 15 - Item 19)

4. HRSG PERFORMANCE FEATURES
((Illustrative as run values))
S.No. ITEM REFERENCE VALUE
21. FG TEMP. AT LP SUPER HTR. 225.00
INLET O C
22. FG TEMP. AT LP SUPER HTR. 224.00
OUTLET o C
23. LP SUPER HTR. TEMP.O C 197.20
24. ENTHALPY OF LP SUPER 680.00
HEATER STEAM (kCal/kg)
25. ENTHALPY OF LP SATURATED 650.50
HEATER STEAM (kCal/kg)
26. HEAT PICKUP IN LP SUPER 0.889
HEATER ( MkCal/hr)
item-4 * 103 (Item-24-Item-25)

5. HRSG PERFORMANCE FEATURES
(Illustrative as run values)
S.No. ITEM REFERENCE VALUE
27. Fl.Gas TEMP. AT LP EVAP.
224.00
INLET oC
28. Fl.Gas TEMP. AT LP EVAP. 169.00
OUTLET oC
29. F.WATER ENTHALPY AT 160.70
EVAP. INLET kCal/kg
30. H. PICK-UP IN L.P. 18.727
EVAP (Mkcal/hr)
Item 4*103(Item 25 - Item 29)

6. HRSG PERFORMANCE FEATURES
(Illustrative as run values)
S.No. ITEM REFERENCE VALUE
31. FG TEMP. AT LP/HP1 169/169
ECONOMISER INLET oC
32. FG TEMP. AT LP/HP1 120/133
ECONOMISER OUTLET oC
33. FG TEMP. AT LP ECONOMISER 104.60
INLET oC
34. HEAT PICK-UP IN L.P. 0.889
ECONOMISER-1
(Mill.kcal/hr)
(Item 4*103(Item 29 - Item 33)

7. HRSG PERFORMANCE FEATURES
(Illustrative as run values)
S.No. ITEM REFERENCE VALUE
35. FG TEMP. AT CONDENSATE 120/133
PRE HEATER INLET oC
36. FG TEMP. AT CONDENSATE 105.00
PRE HEATER OUTLET oC
37. FLOW THROUGH CONDENSATE 190.62
PRE HEATER TPH (Item3-Item4)
38. FW TEMP. AT CONDENSATE 47.00
PRE HEATER INLET OC
39. FW TEMP. AT CONDENSATE 94.10
PRE HEATER OUTLET OC
40. HEAT PICKUP IN 9.355
CONDENSATE PREHEATER
(MkCal/hour)
41. TOTAL HEAT PICKUP BY 47.00
HRSG BY WATER & STEAM
CIRCUIT (MkCal/hr)

8. BREAK UP OF HEAT PICKUP IN VARIOUS
HEAT TRANSFER SURFACES
S.No. ITEM REFERENCE VALUE
1. PERCENTAGE BREAKUP OF
HEAT PICKUP IN VARIOUS HEAT
TRANSFER SURFACES:
A. HP SUPER HEATER 17.89
B. HP EVAP. 41.95
C. HP ECON. 1&2 19.06
D. LP SUPER HEATER 8.55
E. LP EVAP. 12.74
F. LP ECON. 1.42
G. CONDENSATE PREHEATER 6.36
2. AMBIENT AIR TEMP. OC 29.00
3. THERMAL EFFY. OF HRSG 84.43
(Item10 - Item36/
(Item10 - Item43)*100
Comparing the above as run values with design data
Would serve as an audit and diagnostics tool for
Improvements.

9. COMB.CYCLE STEAM TURBINES
OBJECTIVE
• TO ASSESS THE AS RUN PERFORMANCE
AND EFFICIENCY OF STEAM TURBINE SYSTEMS
AS RUN MEASUREMENTS INVOLVED:
• HRSG HP SUPER HEATED STEAM FLOW TO
TURBINE IN MT/HR
• HRSG LP SUPER HEATED STEAM FLOW TO
TURBINE IN MT/HR
• HP STEAM PRESSURE IN BAR
• LP STEAM PRESSURE IN BAR
• HP SUPER HEATED STEAM TEMPERATURE IN OC
• LP SUPERHEATED STEAM TEMPERATURE IN OC
• CONDENSER VACUUM (MILLI BAR)
• STEAM TURBINE GENERATOR ACTIVE POWER
IN MW
• DRYNESS FRACTION OF TURBINE EXHAUST :
ESTIMATED AS WARRANTED

10. STEAM TURBINE PERFORMANCE
ASSESSMENT ILLUSTRATIVE
CALCULATION
1) Trial Duration : (As run Sample Reference)
2) HP Steam Flow : 350.26 TPH
3) HP Steam Pressure & : 65.44 bar, 518 oC
Temperature
4) HP Steam Enthalpy : 3459.50
kJ/KG
5) LP Steam Flow in TPH : 79.58 TPH
6) LP Steam Pressure & : 4.35 bar, 194.2 oC
Temperature
7) LP Steam Enthalpy : 2842.40
kJ/KG
8) Condenser Vacuum m : 93.50
bar
9) Condenser Saturated : 44.5 oC and 186
Temperature & Enthalpy
10) Exhaust Steam : 2144.20
Enthalpy for 0.82
Dryness Fraction in
kJ/KG

11. 11) Condensate Enthalpy : 186.0
kJ/KG
12) Heat Input to Steam : [(Total HP Steam Flow in TPH)
Turbine 1000 * kJ/Hr. * (HP Steam Enthalpy – LP
Exhaust Enthalpy) + (Total LP
Steam Enthalpy - LP Exhaust
Enthalpy)]
: [(Item 2)(Item 4 - Item 10) +
(Item 5) (Item 7 - Item 10)]
: (350.26)(3459.5 - 2144.2) +
(79.58)(2842.40 - 2144.2)
: 460696.97 + 55562.76
: 516259.73
13) Theoretical Heat Input : Heat Input to Turbine in KJ/HR
to Turbine in MW 1000 * 3600
: Item 12/3600
: 143.40
14) Actual Generator : 112.43
Output (MW)
15) Turbine + Generator : Generator Output/Turbine
Efficiency Input
: Item 14 / Item 13
: 78.40%

12. 16) Turbine Heat Input with : [(Total HP Steam Flow in TPH)
Reference to * (Heat Steam Enthalpy -
condensate Enthalpy Condensate Enthalpy) + (total
(1000 * kJ/Hr) LP Steam Flow in TPH) * (LP
Steam Enthalpy - Condensate
Enthalpy)]
: [(Item 2)(Item 4 - Item 11) +
(Item 5)(Item 7 - Item 11)]
: [(350.26)(3459.5 - 186) +
(79.58)(2842.4 - 186)]
: 1146576.10 + 211396.30
: 1357972.40
17) Feed Water and Steam : (Turbine Heat Input w.r.t.
Turbine System Heat condensate Enthalpy in
Rate in Kcal/kWh Kcal)/(TG Output in kWh)
: (Item 16) / 4.18 * 1/(Item 14)
: 2889.56 Kcal/ kWh
18) TG Output as % of 100% : (Item 14) * 100 = (112.43) * 100
Base Load Rating 115.69 115.69
: 97.18%