为了探究燃气轮机在应用于IGCC系统时，由于空气分离（以下简称空分）集成方式与燃料热值变化引起的复杂约束问题，以某F级燃气轮机为基础，构建IGCC系统燃气轮机及空分系统性能模型，研究不同运行约束条件下空分集成方式对燃气轮机通流匹配的约束边界，确定了保持进口导叶IGV全开时空分整体化率和氮气回注率的可行域与燃气轮机性能的变化规律，并针对限制因素给出压气机的流量设计需求及改进后的性能对比。结果表明：保持透平进气温度稳定在设计值的情况下，可实现的最小空分整体化率为0.15；受合成气热值及空分系统集成方式的限制，压气机与透平流量的匹配约束使低整体化率与高回注率的组合无法实现；保持透平排气温度稳定在设计值可行域的范围有所扩大；可行域内，降低空分整体化率、提高氮气回注率均有助于提升燃气轮机性能；对改型前后的燃气轮机性能进行比较，独立空分-氮气不回注组合下燃机效率提高到35.2%；在氮气不回注与氮气完全回注时，独立空分相较于完全整体化空分组合燃气轮机效率分别高19.63%和15.91%。

In order to explore the complex constraints caused by air separation integration mode and fuel calorific value change when gas turbine is applied to IGCC system, a gas turbine and air separation system performance model for IGCC system is constructed based on an Fclass gas turbine. The constraint conditions of matching of air separation integration method on gas turbine throughflow matching under different operating constraints are studied, the feasible domain of air seperation integration degree and nitrogen injection rate and the variation law of gas turbine performance when keeping the inlet guide vane (IGV) fully open are determined, and the flow design requirements of the compressor and the performance comparison after improvement are given for the limiting factors. The results show that when the turbine inlet temperature is constant at the design value, the minimum air seperation integration degree can be achieved as 0.15; limited by the heat value of the syngas and the integration mode of the air separation system, the combination of low integration degree and high nitrogen injection rate cannot be realized due to the matching constraints of the compressor and turbine flow rate; keeping the turbine exhaust temperature stable at the design value, the range of the feasible domain is expanded; in the feasible domain, reducing the air seperation integration degree and increasing the nitrogen injection rate are helpful to improving the gas turbine performance; by comparing the gas turbine performance before and after the modification, the gas turbine efficiency of independent air separation and nitrogen noninjection combination is improved to 35.2%; the efficiency of the independent air separation combination is 19.63% and 1591% higher than that of gas turbine with the fully integrated air separation combination in the case of no nitrogen and nitrogen full injection, respectively.

TK471

国家科技重大专项（J2019-I-0009-0009）；国家自然科学基金（52076079）；河北省自然科学基金(E2020502013)