整体煤气化联合循环系统中废热锅炉特性研究

Syngas Cooler Characteristic in Integrated Gasification Combined Cycle System

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 syngas cooler including radiant syngas cooler （RSC） and convective syngas cooler （CSC）,it is the high temperature cooling unit in integrated gasification combined cycle （IGCC） system.It can recover the raw syngas heat energy out of the gasifier to increase the system efficiency,so the study on the syngas cooler characteristic in IGCC system is of great significance.The 200 MW ICCC system model was established using Thermoflex software.From the view of system efficiency,the effect on the system performance with different syngas temperature out of CSC was studied firstly,and then the influence on the system performance with different steam parameter was calculated.The conclusions can be obtained from the calculated results：the system power and efficiency decrease with the increasing of raw syngas temperature out of the CSC;the system efficiency with syngas cooler generating superheated steam is better than the system with syngas cooler generating saturated steam;the system efficiency with syngas cooler generating high pressure steam is better than the system with syngas cooler generating intermediate pressure steam.Considering the cost and the system efficiency,the best steam parameter system scheme is the system with RSC and CSC generating high pressure saturated steam.