基于F级燃气轮机烟气再循环系统的分析

摘要

分析了烟气再循环技术直接应用于F级燃气轮机联合循环时对燃气热力循环参数的影响,对比分析了余热锅炉后排气分别按照无烟气循环和烟气再循环比例为10％、20％和30％的工况,烟气再循环在联合循环条件下燃气轮机进口温度与进口氧体积分数的变化趋势,以及不同烟气再循环比例条件下联合循环出力的变化趋势;计算了不同负荷条件下烟气再循环对燃气轮机本体透平进口温度及排气温度的影响;分析了烟气再循环对潜在CO2捕集的优势,结果表明:烟气再循环可在部分负荷下提升联合循环效率,并且有助于CO2捕集.%Thermal performance of a classical F-class combined cycle unit was analyzed after the technology of exhaust gas recirculation (EGR) was applied under the recirculation ratios of none,10％,20％ and 30％,in which case,the variation tendencies of gas turbine inlet temperature,oxygen concentration and combined cycle power output were studied.In addition,the effects of EGR on the inlet temperature and exhaust temperature of gas turbine were researched via calculation at different loads,while the benefit to adopt EGR technology in CO2 capture was evaluated.Results show that EGR helps to improve the cycle performance at partial load,which is also beneficial to CO2 capture.