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采用Thermoflex软件建立200 MW级IGCC系统模型,简要地对气化岛设计参数进行了分析,并对燃气轮机在100%～40%负荷下的气化岛变工况进行计算,分析比较气化岛主要设备性能参数的变化。结果表明:燃气轮机负荷降低时,在氧碳比不变的条件下,入气化炉的煤浆量和氧气量都减小,空分系统等耗功减少;废锅出口合成气温度、压力降低,废锅吸热功率也同时减少,废锅蒸汽做功能力下降;脱硫系统吸收塔入口合成气温度降低;燃气湿饱和器出口合成气压力降低,导致合成气中H_2O的体积分数减小,不利于减少NO_x排放。
The model of 200 MW IGCC system was established by using Thermoflex software. The design parameters of gasification island were briefly analyzed, and the gas turbine islanding conditions under 100% -40% load were calculated. The gasification island main Changes in equipment performance parameters. The results show that when the load of gas turbine is reduced, the amount of coal slurry and oxygen entering the gasifier will decrease and the energy consumption of air separation system will decrease under the condition of constant ratio of oxygen to carbon; the temperature and pressure of the synthesis gas at the waste boiler will decrease , The waste heat absorption power of the boiler is reduced at the same time, the power of the waste boiler steam is decreased; the temperature of the synthesis gas at the inlet of the absorption tower of the desulfurization system is decreased; the pressure of the synthesis gas at the outlet of the gas wet absorber is reduced, resulting in the decrease of the volume fraction of H 2 O in the synthesis gas Conducive to reducing NO_x emissions.