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废热锅炉包括辐射废热锅炉(radiant syngas cooler,RSC)和对流废热锅炉(convective syngas cooler,CSC),它是整体煤气化联合循环(integrated gasification combined Cycle,IGCC)系统中的高温冷却单元,可回收气化炉出口粗合成气热能,以提高系统的效率,所以研究IGCC系统中废热锅炉的特性是很有意义的。该文利用ThermoFlex软件建立200MW级IGCC系统模型,从系统效率角度出发,首先研究对流废热锅炉出口合成气温度对IGCC系统性能的影响,然后研究废热锅炉产生不同蒸汽参数对IGCC系统性能的影响。结果表明:随着对流废热锅炉出口合成气温度的提高,系统的发电功率和效率下降;废热锅炉产生过热蒸汽的系统效率优于产生饱和蒸汽的系统效率,废热锅炉产生高压蒸汽的系统效率优于产生中压蒸汽的系统效率;综合考虑造价及其系统效率的影响,推荐最佳的蒸汽参数方案为辐射废热锅炉和对流废热锅炉均产生高压饱和蒸汽的系统。
The waste heat boilers include a radiant syngas cooler (RSC) and a convective syngas cooler (CSC), which are high temperature cooling units in an integrated gasification combined cycle (IGCC) system, with recoverable gas It is very meaningful to study the characteristics of waste heat boiler in IGCC system to export the heat energy of raw syngas to increase the efficiency of the system. In this paper, the 200MW IGCC system model is established by using ThermoFlex software. From the system efficiency point of view, the influence of the temperature of the synthesis gas at the outlet of the waste heat boiler on the performance of the IGCC system is studied. Then, the influence of different steam parameters on the IGCC system performance is studied. The results show that with the increase of the synthesis gas temperature at the outlet of the convection waste heat boiler, the power generation efficiency and efficiency of the system decrease. The system efficiency of the superheated steam produced by the waste heat boiler is better than that of the system generating saturated steam. The system efficiency of medium-pressure steam is generated. Considering the cost and the influence of system efficiency, the optimal steam parameter scheme is recommended as a system for generating high-pressure saturated steam in both the radiation waste heat boiler and the convection waste heat boiler.