低热值煤气燃气轮机联合循环运行方案分析

Operating Scheme Analysis of Gas Turbine Combined Cycle With Low Calorific Value Gas

燃气轮机联合循环发电机组(gas turbine combined cycle systems,GTCC)广泛应用于中国钢铁企业以高效回收利用副产煤气。建立了低热值煤气GTCC系统变工况运行仿真模型,分析了环境温度、煤气热值,以及考虑进气冷却时进气温度对联合循环性能的影响过程。研究了3种不同运行方案在环境温度升高情况下,对联合循环性能的改进效果。研究结果表明:在环境温度高于设计值时,通过调节进气温度和煤气热值相结合的运行方案,联合循环机组出力提升幅度最大。以300MW级M701S(F)燃气轮机联合循环发电机组作为分析对象,当在环境温度为35℃时,进气冷却使联合循环出力提高28.96MW;当煤气热值可调时,联合循环的最大出力提升幅度可以进一步提高至30.28MW。

Gas turbine combined cycle systems(GTCC)have wide applications to utilize byproduct gases with the high efficiency in China’s steel plants.An analytical model was proposed for simulating the operation of a low calorific value gas GTCC,aiming to analyze the influence of ambient temperature,lower heating value(LHV)of gas,and inlet air temperature on the combined cycle performance under off-design conditions.Three operating schemes for improving the performance of GTCC were evaluated as the ambient temperature rises.The research results show that the maximum output of the combined cycle can be achieved through the operation scheme combining the regulation of inlet air temperature and LHV.For the 300MW M701S(F)unit,the combined cycle output is increased by 28.96MW through inlet air cooling at ambient temperature of 35℃.When the regulation of gas LHV is considered simultaneously,the combined cycle output can be ultimately increased by 30.28MW.