摘要
为了提高燃气轮机联合循环机组的变工况效率,本文提出了一个新型的部分回热燃气轮机联合循环系统,结合2种相应的利用回热调节负荷运行策略,分析其变工况特性。与常规回热燃气轮机的区别在于,新系统中仅有部分透平排烟用于预热压气机出口空气,且在93.6%~100%负荷时通过改变参与回热的烟气比例调节机组负荷。结果表明:采用IGVT3-T4方案更有利于提升新循环整体性能,与采用相似IGVT3-T4-F运行策略的基准机组效率最大差值为1.4%;改变回热烟气比例过程中,机组实际上是通过调节比功来调节负荷,而其变负荷效率接近设计数值;采用新运行策略的部分回热循环相对传统燃气轮机联合循环变工况效率更高,设计工况下机组联合循环出功仅降低10.7 MW。本文提出的部分回热燃气轮机联合循环系统是一种良好的燃气轮机联合循环机组的改造与运行方案。
A new partially recuperative gas turbine combined cycle(GTCCpr)system is proposed to improve its performance under off-design conditions.The performance under off-design conditions is also analyzed combining with two corresponding operation strategies of load regulation by using regenerative heat.The difference from conventional recuperative gas turbines is that only part of the turbine exhaust gas in the new system is used to preheat the outlet air of the compressor.In the 93.6%~100%load,the unit load is adjusted by changing the fraction of the exhaust gas involved in the regenerative heat.The results indicate that the use of the IGVT3-T4 scheme is more conducive to improve the overall performance of the new cycle.The maximum efficiency difference between the IGVT3-T4 scheme and the benchmark unit of the IGVT3-T4-F scheme with similar operation strategy is 1.4%.During the process of changing the fraction of the exhaust gas involved in the regenerative heat,the unit load is adjusted by changing its specific power,and the efficiency under off-design conditions is close to the design value.The GTCCpr system using the new operation strategy is more efficient than the conventional GTCCpr system,and the power output of combined cycle is only reduced by 10.7 MW under design conditions.In general,the GTCCpr system proposed in this paper is a good transformation and operation scheme.
作者
刘桃宏
刘恒平
宋晓玮
杨勇平
LIU Taohong;LIU Hengping;SONG Xiaowei;YANG Yongping(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)
出处
《热力发电》
CAS
北大核心
2018年第9期122-127,共6页
Thermal Power Generation
基金
国家自然科学基金项目(51436006
51306049)
中央高校基本科研业务费专项资金资助(2017MS15)~~
关键词
燃气轮机
部分回热
联合循环
变工况
负荷调节
底循环
顶循环
运行策略
gas turbine
partially recuperation
combined cycle
off-design condition
load regulation
bottoming cycle
topping cycle
operation strategy
