水煤浆气化合成气显热回收对IGCC电站性能的影响

Influence of Syngas Sensible Heat Recovery on Performances of IGCC Power Plant Based on Coal Water Slurry Gasification

利用Thermoflex热力系统软件分别建立了基于GE-Texaco和E-Gas水煤浆气化的400MW级IGCC电站模型,通过设置的5种合成气显热回收方案,分析了水煤浆气化炉型、废热锅炉配置和废热锅炉出口合成气温度3个因素对IGCC电站性能的影响.结果表明:与GE-Texaco全热回收气化技术相比,采用E-Gas全热回收气化技术时蒸汽轮机的发电量和净发电量较低,供电效率提高、厂用电耗率降低;与合成气激冷方案相比,增设辐射废锅和对流废锅可以提高GE-Texaco气化合成气显热回收过程的蒸汽质量流量,进而提高IGCC电站的蒸汽轮机发电量、净发电量和供电效率;降低废热锅炉出口合成气的温度可以改善IGCC电站的整体性能.

400 MW IGCC power plant models were developed based on GE-Texaco and E-Gas coal water slurry gasification technologies by using Thermoflex thermodynamic system software.Five schemes for syngas sensible heat recovery were set up to study the influence of following factors on the IGCC performance,such as the gasifier type,the configuration of syngas cooler and the syngas temperature at cooler exit,etc.Results show that comparing with GE-Texaco technology,E-Gas gasification process has lower steam turbine output and net power output,but higher power supply efficiency and lower house power consumption rate under sensible heat recovery conditions;comparing with GE-Texaco quench method,the installation of radiant and convective syngas coolers helps to promote the steam yield during syngas sensible heat recovery process,thus elevating the steam turbine output,net power output and power supply efficiency of the IGCC unit;decreasing the syngas temperature at cooler exit is beneficial to improve the plant performance.