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为了提高火电机组的热效率,建立了采用多级压缩、中间冷却以及多级膨胀、中间再热的燃气轮机与循环流化床(CFB)锅炉耦合系统性能的计算模型并进行了计算.结果表明:随着涡轮进口压力的升高和压气机级数的增加,耦合系统的热效率均有一个最大值;随着涡轮入口温度的升高和涡轮级数的增加,热效率可增加到约46%,因此,新系统具有高热效率、低厂用电率的优点;考虑到系统的结构复杂性以及综合经济性,压气机和涡轮均采用3级为宜.
In order to improve thermal efficiency of thermal power units, a computational model of coupled system performance of gas turbine and circulating fluidized bed (CFB) boiler with multistage compression, intercooling, multi-stage expansion and intermediate reheating was established and calculated. The results show that As the turbine inlet pressure increases and the compressor stage increases, the thermal efficiency of the coupled system has a maximum value. As the inlet temperature of the turbine increases and the turbine stage increases, the thermal efficiency can be increased to about 46%. Therefore, The new system has the advantages of high thermal efficiency and low power consumption of the plant. Taking into account the structural complexity of the system and the comprehensive economy, the compressor and the turbine are all suitable for level 3.