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解决燃气轮机的通流问题,确定燃用中低热值合成气燃气轮机的最佳运行工况是研究整体煤气化联合循环（integrated gasification combined cycle,IGCC）系统的重点内容之一。该文对一台200 MW级IGCC机组进行研究,从系统的角度出发提出燃气轮机通流的3种调整方案,并分析方案变化对燃气轮机特性和IGCC系统性能的影响。结果表明,在一定范围内减小压气机入口空气流量或增大透平通流面积,有利于提高燃用中低热值合成气的燃气轮机特性与IGCC系统性能。合理搭配压气机抽气比例和氮气回注量可提高IGCC的系统效率。3种调节方案都存在最佳值,使燃气轮机和IGCC系统获得最大功率与最高效率。研究结果为燃用中低热值合成气燃气轮机的最佳运行工况的确定以及IGCC电站系统的设计和运行提供参考。“,”It is one of keystones to research on integrated gasification combined cycle（IGCC） system that solving gas turbine flow problem and determining the optimal operation condition of the gas turbine burning fuels with medium and low heat value fuel.A 200 MW IGCC unit was researched,and three regulation schemes of gas turbine were prsented from the view of system.The effects of these regulation schemes on the characteristics of the gas turbine and the performance of IGCC system were given.The results show that reducing the compressor inlet airflow or increasing turbine flow area within limits can improve the characteristic of the gas turbine burning low-value syngas and the performance of the IGCC system.Rationally arranging air separation unit（ASU） integrated coefficient（Xas） and nitrogen reinjecting coefficient（Xgn） can increase efficiency of the IGCC system.The parameters of these three regulation schemes all have optimal values which can make the gas turbine and IGCC system have the largest power and efficiency.The results of the research can help to confirm optimal operation condition of gas turbine burning low-heat-value syngas and can also provide convenience for the design and operation of IGCC power plant.