Research on dual heat source cascade heating plan for natural gas based on heat recovery steam generator of F-class combined cycle power unit

XIA Lin; ZHOU Gang; WU Changbing; XIANG Dong; ZHANG Xuehua; LIU Yin; ZHAO Siyong; GE Xiaoming; XIAO Junfeng; HU Mengqi; LIAN Xiaolong; WANG Yifeng

doi:10.19666/j.rlfd.202203056

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Research on dual heat source cascade heating plan for natural gas based on heat recovery steam generator of F-class combined cycle power unit

更新时间：2025-09-28

- Research on dual heat source cascade heating plan for natural gas based on heat recovery steam generator of F-class combined cycle power unit
- Thermal Power Generation Vol. 51, Issue 8, Pages: 84-90(2022)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能重庆两江燃机发电有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202203056
  CLC： TM611.31
- Published：2022
- 稿件说明：
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XIA Lin, ZHOU Gang, WU Changbing, et al. Research on dual heat source cascade heating plan for natural gas based on heat recovery steam generator of F-class combined cycle power unit[J]. Thermal power generation, 2022, 51(8): 84-90.
DOI：

XIA Lin, ZHOU Gang, WU Changbing, et al. Research on dual heat source cascade heating plan for natural gas based on heat recovery steam generator of F-class combined cycle power unit[J]. Thermal power generation, 2022, 51(8): 84-90. DOI： 10.19666/j.rlfd.202203056.

摘要

基于Thermoflow软件建立某F级联合循环机组底层蒸汽循环热力计算模型，并针对双热源梯级加热方案对机组性能的提升机理进行分析。与单热源加热方案相比，双热源梯级方案将大部分单热源加热方案中加热天然气的热量采用余热锅炉尾部的低品位废热来代替，并将中压省煤器处高品位的烟气热能用于产生更多的再热蒸汽、低压蒸汽流量，提升机组出力，并降低余热锅炉排烟温度。随着机组负荷的下降或环境温度的增加，双热源梯级加热方案对机组性能的提升效果将减弱。经计算分析，F级联合循环机组采用双热源梯级加热方案的年收益将达到约60万元，投资回收期为约5.5年。

Abstract

Based on Thermoflow software

a thermodynamic calcluation model of bottom steam cycle of an Fclass combined cycle power plant(CCPP) was established

and the performance improvement mechanism of the CCPP was analyzed for dual heat source heating plan(DHSHP). Compared with the single heat source heating plan(SHSHP)

the DHSHP replaces most of the heat for heating natural gas in the SHSHP with the low-grade waste heat energy at outlet of the heat recovery steam generator(HRSG)

and uses the high-grade gas heat energy around the medium pressure economizer to generate more reheat steam and low-pressure steam flow

thus to increase the CCPP output

and reduce the HRSG exhaust gas temperature. With the drop of the CCPP load or the increase of the ambient temperature

the effect of the DHSHP on the performance improvement of the CCPP will be weakened. According to the calculation and analysis

it is found that the annual income of the F-class CCPP using the DHSHP will reach around 600 000 yuan

and the investment recovery period will be about 5.5 years.

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