Integration and performance analysis of high back pressure gas turbine combined cycle power generation system

薛鹏; 高四艺; 杨雨; 冯志恒; 李永毅; 张国强

doi:10.19666/j.rlfd.202501049

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Integration and performance analysis of high back pressure gas turbine combined cycle power generation system

Thermal Power Generation Vol. 54, Issue 11, Pages: 1-11(2025)

更新时间：2026-08-11

- Integration and performance analysis of high back pressure gas turbine combined cycle power generation system
- 作者机构：
  
  1. 华北电力大学能源动力与机械工程学院
  2. 华北电力大学动力工程系
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202501049
  CLC： TM611.3
- Published：2025
- 稿件说明：
移动端阅览
[1]薛鹏,高四艺,杨雨,等.高背压燃气轮机联合循环发电系统的集成与性能分析[J],2025,54(11):1-11.
[1]薛鹏,高四艺,杨雨,等.高背压燃气轮机联合循环发电系统的集成与性能分析[J],2025,54(11):1-11. DOI： 10.19666/j.rlfd.202501049.

DOI：10.19666/j.rlfd.202501049.

摘要

针对燃气轮机（燃机）变背压运行调节具有高变工况效率的特性，在构建联合循环时主动提高设计工况时燃机的背压，提出了一种高背压燃机联合循环发电系统方案，即在主顶循环之前和之后分别设置前置压气机和膨胀机用于保持和调节燃机的排气压力。基于F级燃机透平初参数设计了此联合循环的关键参数，针对关键参数再循环烟气的温度（分为冷却到常温和不冷却2种情况）、主顶循环压比和燃机背压开展了案例和特性规律分析。分析结果表明，再循环烟气冷却时的联合循环效率没有不冷却时高，在透平背压为0.30 MPa时，其分别为58.07%和58.94%，主要原因为再循环烟气温度较高时主压气机的出口温度较高，燃烧室?损失较低。燃机背压为0.30 MPa时联合循环系统效率最佳压比为17.0，其对应的联合循环效率为58.97%，比功为563.87 k J/kg。综合考虑比功推荐主顶压比为15.4，其透平背压在0.03～0.35 MPa时，冷却到常温和不冷却2种情况下联合循环效率变化区间分别在56.00%～58.57%和55.81%～59.12%，均为先上升后降低，高背压时联合效率变化范围不大。同时，基于实际工程应用，考虑了单一余热锅炉的设计情况，分析了其热力特性和可能的可再生能源灵活低成本高效利用方式，可为多能互补灵活高效的现代化联合循环提供新的系统方案参考。

Abstract

Based on the concept of high efficiency of gas turbine variable back pressure operation regulation

a high back pressure gas turbine combined cycle power generation system scheme is proposed

in which a pre-compressor and an expander are set in front and behind the main top cycle respectively to maintain and regulate the gas turbine exhaust pressure. Key parameters of the combined cycle are designed based on the initial parameters of the F-class gas turbine

and the case and characteristic analysis are carried out for the temperature of recirculated gas(divided into two conditions: cooling to normal temperature and not cooling)

the main top cycle pressure ratio and the gas turbine back pressure. The results show that

the combined cycle efficiency of the recirculated flue gas cooling is not as high as that of the non-cooled flue gas cooling

which is 58.07% and 58.94% when the turbine back pressure is 0.30 MPa. The exergy loss rate of the main compressor is lower because the exit temperature of the main compressor is higher when the recirculated flue gas temperature is higher. When the gas turbine back pressure is 0.30 MPa

the maximum pressure ratio of the combined cycle system efficiency is 17.0

the corresponding combined cycle efficiency is 58.97%

and the specific work is 563.87 kJ/kg. Considering the specific work comprehensively

the recommended main top pressure ratio is 15.4

and when the turbine back pressure is from 0.03 MPa to 0.35 MPa

the variation range of the combined circulation efficiency under the two conditions is about 56.00%～58.57% and 55.81%～59.12%

respectively

which increases at first and then decreases

and the variation range of the combined efficiency is not large at high back pressure. At the same time

based on the practical engineering application

the design of a single waste heat boiler is considered

and its thermal characteristics and possible flexible

low-cost and efficient utilization of renewable energy are analyzed

which provides a new system scheme reference for the flexible and efficient modern combined cycle with multi-energy complementarities.

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