应用甲烷重整技术的燃气轮机新循环热力学分析

摘要

提出了应用甲烷重整技术的新型燃气轮机循环,建立新型燃气轮机循环系统的工作流程,并通过平衡常数的计算来分析燃烧室的反应平衡,研究了燃气轮机循环热效率的变化.结果表明：甲烷发生吸热的重整反应对甲烷燃烧的消耗量有影响;在相同燃料量的条件下,新循环与简单循环相比,热效率得到大幅提高;由于重整反应生成的混合气体组分中多了CO和H2气体,使得混合气体平均比定压热容增大;随着燃烧室出口温度T3的升高,新循环甲烷平衡的转化率逐渐增大,随着压比的增大,转化率逐渐降低.%A new type of gas turbine cycle applying methane reforming technology is being proposed,for which process a mathematical model is built up.The reaction equilibrium in combustion chamber is then analyzed based on equilibrium constant calculation,so as to study the variation law of thermal efficiency of the gas turbine cycle.Results show that the endothermic reaction of methane reforming influences the amount of combusted methane;in the same conditions of fuel flow,compared with simple cycle,the thermal efficiency of new system increases significantly;due to additional existence of CO and H2 in the gas mixture of new system,the average specific heat rises;the methane conversion rate goes up gradually with rising outlet temperature T3 of combustion chamber,and reduces with increasing pressure ratio ε.