贫燃催化燃烧燃气轮机部分负荷特性分析

Investigation on Part Load Characteristics of Gas Turbine With a Lean-burn Catalytic Combustion Chamber

介绍了贫燃催化燃烧燃气轮机系统的流程及可采用的部分负荷调节方式。建立各主要部件的数学模型,进行各调节方式下部分负荷特性的分析。提出了压气机进气加热调节方式,将此调节方式下的部分负荷特性与其他调节方式下的特性进行了对比。得到的主要结论有:催化燃烧室入口温度是影响系统部分负荷运行的关键因素;转速调节的工作范围最大,抽气调节居中,燃料气量调节最小;燃料气量调节方式下,甲烷转化率最低;在正常工作范围内,燃料气量调节工况下的系统热效率高于抽气调节工况下的热效率;压气机进气加热调节能延伸燃料气量调节方式的工作范围,但是降低了热效率。

The flowsheet and available control strategies for part load operation of a lean-burn catalytic combustion gas turbine system were investigated. The models of the key components were set up. The part load characteristics under various part-load control strategies were analyzed. The performance of proposed part load control strategy using compressor inlet heating was compared with that of the other control strategies. The main results show that the combustor inlet temperature is a significant factor that can affect the part load characteristics of the system, the operation range of speed modulation is very wide, the bleeding modulation range is relatively narrow and the fuel flow modulation range is narrowest, the methane conversion rate of fuel flow modulation is lowest, the thermal efficiency under fuel flow control strategy is higher than that under bleeding control strategy within the operation range, compressor inlet heating modulation can extend the range of the part-load operation under fuel flow modulation at the expense of thermal efficiency.