Off-design performance optimization of the combined cycle system based on variable back pressure modification

ZHANG Guoqiang; ZHANG Heng; LI Yongyi; LIU Hengping; SONG Xiaowei; YANG Zhiping; YANG Yongping

doi:10.19666/j.rlfd.201707078

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Off-design performance optimization of the combined cycle system based on variable back pressure modification

更新时间：2025-09-28

- Off-design performance optimization of the combined cycle system based on variable back pressure modification
- Thermal Power Generation Vol. 47, Issue 4, Pages: 92-98(2018)
- 作者机构：
  
  华北电力大学能源动力与机械工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201707078
  CLC： TK115
- Published Online：09 April 2018，
  
  Published：2018
- 稿件说明：
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ZHANG Guoqiang, ZHANG Heng, LI Yongyi, et al. Off-design performance optimization of the combined cycle system based on variable back pressure modification[J]. Thermal power generation, 2018, 47(4): 92-98.
DOI：

ZHANG Guoqiang, ZHANG Heng, LI Yongyi, et al. Off-design performance optimization of the combined cycle system based on variable back pressure modification[J]. Thermal power generation, 2018, 47(4): 92-98. DOI： 10.19666/j.rlfd.201707078.

摘要

为了优化燃气-蒸汽联合循环变工况性能

本文对常规燃气-蒸汽联合循环系统进行改造

提出了一种变背压改造方法。改造系统在常规联合循环机组的余热锅炉尾部烟道布置引风机

以此降低机组部分工况下的燃气透平背压。以S109FA燃气-蒸汽联合循环作为参比机组

通过对参比机组和改造机组建模

采用等透平入口温度+燃料调节运行策略

分析并比较了二者的变工况性能。结果表明:与参比机组相比较

改造机组部分负荷下的顶、底循环效率均有所提高

联合循环负荷在84%~35%时

顶循环效率提高0~2.7百分点

底循环效率提高0~3.0百分点

联合循环的效率也相应提高

增幅为0~2.5百分点。变背压改造系统可以充分利用IGV流量调节

并提高相应流量下的燃气初参数

为燃气-蒸汽联合循环电站高效改造及运行提供了技术借鉴。

Abstract

In order to optimize the off-design performance of the gas-steam combined cycle system

a new type of variable back pressure modification method is proposed based on the conventional gas-steam combined cycle system.The reforming system has a draught fan in the tail flue of the heat recover steam generator of the conventional combined cycle unit.Then the back pressure of the gas turbine under some operating conditions of the unit can be reduced by the fan.Taking the gas-steam combined cycle S109 FA as the reference unit

the reference unit and the reforming unit are modeled

and then the off-design performances of these two units are analyzed and compared through adopting the same turbine inlet temperature and the fuel adjusting operation strategy.The results show that

the efficiencies of the topping cycles and bottoming cycles under the partial load of the reforming unit are improved compared with the reference unit.At the combined cycle of 84%~35% load

the efficiency of topping cycle increases by 0~2.7%

the efficiency of bottoming cycle increases by 0~3.0% and the efficiency of combined cycle increases by 0~2.5%.The variable back pressure modification system can use IGV to control flow and improve the gas initial parameters of the corresponding flow

which provides technical reference for efficient transformation and operation of gas-steam combined cycle power plant.

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