燃气循环发电系统多目标优化设计

Multi-objective optimization design of gas cycle power generation system

为了进一步提高重型燃气轮机单循环和联合循环效率,本文提出一种考虑循环热效率、投资成本和污染物排放的燃气循环系统多目标优化设计模型,确定最佳压比、燃烧室出口温度、排烟温度、冷却空气比例,并分析多目标之间的影响过程。所构建的非线性数学模型采用GAMS软件求解。计算结果表明,以热效率最大为优化目标,最佳压比为24,燃烧室出口温度为2 019℃,冷却空气比例为44%,排烟温度646℃,热效率达到42.2%。当权衡系统总投资成本、污染物排放与循环热效率进行多目标优化时,燃气循环热效率应在39%~39.5%。

In order to further improve the efficiency of heavy-duty gas turbine single cycle and combined cy-cle,this paper proposes a multi-objective optimization design model of gas cycle system considering cycle thermal efficiency,investment cost and pollutant emission,to determine the optimal pressure ratio,combus-tion chamber outlet temperature,exhaust temperature,and cooling air ratio,and to analyze the influencing process between the multi-objectives.The constructed nonlinear mathematical model is solved by GAMS soft-ware.The calculation results show that with the maximum thermal efficiency as the optimization objective,the optimal pressure ratio is 24,the combustion chamber outlet temperature is 2019℃,the cooling air ratio is 44%,the exhaust temperature is 646℃,and the thermal efficiency reaches 42.2%.When weighing the to-tal investment cost of the system,pollutant emissions and circulating thermal efficiency for multi-objective op-timization,the thermal efficiency of the gas cycle should be from 39%to 39.5%.