【摘要】 研究对象为PG9171E型燃气轮机为顶循环的联合循环机组,构建了燃气-蒸汽联合循环系统变工况模型.通过改变环境温度及相应边界条件,分析了环境温度对联合循环机组全工况性能及调峰能力的影响情况.结果表明:以性能保证工况作为基准工况,降低大气温度,以冬季工况为代表,其全工况性能优于基准工况,效率比基准工况提高幅度为1.69%～3.75%,其出功增加幅度为11.48%～11.57%;提高大气温度,以夏季工况为代表,其全工况性能劣于基准工况,效率降低幅度为2.56%～5.08%,其出功降低幅度为10.44%～10.58%;对于机组的调峰能力,随着环境温度的升高,机组的调峰能力在降低,-20℃时联合循环机组最大、最小发电负荷分别为47.63,242.62MW;40℃时最大、最小发电负荷分别为39.14,172.12MW,全年温度范围内调峰幅度为132～194MW.更多还原

【Abstract】 Taking a cycle combined with PG9171E gas turbine as the benchmark unit,agas-steam combined cycle off-design model was established.By changing the ambient temperature and the corresponding boundary conditions,the design/off-design performance and peak load regulation of the combined cycle was analyzed.The results show that,basing the performance guarantee condition as the benchmark condition,with lower temperature as winter condition,the unit exhibits a better off-design performance,with the efficiency increment of 1.69%～3.75%,and its net power output will increase by11.48%～11.57%.On the contrary,with higher temperature as summer condition,the unit shows lower off-design performance with the efficiency decrement of 2.56%～5.08%,and its net power output will decrease by 10.44%～10.58%.For the peaking load capacity of the unit,with higher temperature the capacity is less and the maximum and minimum generating loads is 47.63 MW and 242.62 MW at-20℃,at 40 ℃ is 39.14 MW and 172.12 MW respectively;and the peak load in the whole year temperature range is 132～194 MW.更多还原