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Performance improvement of combined cycle power plant based on the optimization of the bottom cycle and heat recuperation

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Abstract

Many F class gas turbine combined cycle (GTCC) power plants are built in China at present because of less emission and high efficiency. It is of great interest to investigate the efficiency improvement of GTCC plant. A combined cycle with three-pressure reheat heat recovery steam generator (HRSG) is selected for study in this paper. In order to maximize the GTCC efficiency, the optimization of the HRSG operating parameters is performed. The operating parameters are determined by means of a thermodynamic analysis, i.e. the minimization of exergy losses. The influence of HRSG inlet gas temperature on the steam bottoming cycle efficiency is discussed. The result shows that increasing the HRSG inlet temperature has less improvement to steam cycle efficiency when it is over 590°C. Partial gas to gas recuperation in the topping cycle is studied. Joining HRSG optimization with the use of gas to gas heat recuperation, the combined plant efficiency can rise up to 59.05% at base load. In addition, the part load performance of the GTCC power plant gets much better. The efficiency is increased by 2.11% at 75% load and by 4.17% at 50% load.

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Abbreviations

CC :

combined cycle

C.C. :

combustion chamber

C g :

specific heat (J/kg K)

CW :

circulating water

D :

mass flow (kg/s)

EC :

economizer

EV :

evaporator

Ex :

exergy flow (W)

G :

generator

h :

enthalpy(kJ/kg)

HRSG :

heat recovery steam generator

HP :

high pressure

I :

exergy losses (W)

IP :

intermediate pressure

LP :

low pressure

PP :

pinch point

Q th :

total thermal input (W)

R :

regeneration

RH :

reheater

S :

entropy (kJ/kg)

SH :

superheater

T :

temperature (°C)

THP :

high pressure turbine

TIP :

intermediate pressure turbine

TIT :

turbine inlet temperature

TLP :

low pressure turbine

W :

power (W)

η :

efficiency(%)

0 :

ambient state

g :

exhaust gas

GT :

gas turbine

s :

steam

ST :

steam turbine

w :

water

in :

inlet parameter

out :

outlet parameter

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Authors and Affiliations

  1. Education Ministry Key Laboratory of Clean Coal Power Generation and Combustion Technology, Southeast University, Nanjing, 210096, China

    Wenguo Xiang (Associate Professor) & Yingying Chen

Authors
  1. Wenguo Xiang
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  2. Yingying Chen
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Xiang, W., Chen, Y. Performance improvement of combined cycle power plant based on the optimization of the bottom cycle and heat recuperation. J. of Therm. Sci. 16, 84–89 (2007). https://doi.org/10.1007/s11630-007-0084-4

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  • DOI: https://doi.org/10.1007/s11630-007-0084-4

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