Syngas cooler characteristic in integrated gasification combined cycle system

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.