CO_2捕集对输运床气化炉IGCC系统煤气冷却方式选择的影响  

Influences of CO_2 Capture on the Choice of Syngas Cooling Methods for Transport Gasifier Based IGCC Systems

作　　者：迟金玲[1] 赵丽凤[2] 张士杰[1] 王波[1] 李振[1] 

机构地区：[1]中国科学院先进能源动力重点实验室(工程热物理研究所),北京市海淀区100190 [2]中国科学院能源动力研究中心,江苏省连云港市222069

出　　处：《中国电机工程学报》2014年第23期3883-3891,共9页Proceedings of the CSEE

基　　金：中国科学院院地合作项目(YDJDBNJ-2011-003)~~

摘　　要：对于整体煤气化联合循环(integrated gasification combined cycle,IGCC)系统,CO2捕集的引入将对系统煤气冷却方式的选择产生重要的影响。该文分别构建了不捕集及捕集CO2的输运床氧气及空气气化IGCC系统流程,分析激冷及煤气余热锅炉2种煤气冷却方式的引入对系统热力性能及经济性的影响。结果表明,不捕集CO2时,无论是对输运床氧气还是空气气化IGCC,煤气余热锅炉冷却方案热力性能及经济性均明显好于激冷冷却方案;考虑CO2捕集后,尽管采用煤气余热锅炉冷却的输运床氧气气化IGCC系统的供电效率比采用激冷冷却的系统高约1.38个百分点,而2种方案发电成本相当;考虑CO2捕集后的输运床空气气化IGCC系统的热力性能及经济性仍明显好于激冷冷却方案。此外,该文还分析了煤气冷却方式投资对系统经济性的影响,得到2种冷却方式下,输运床氧气气化系统发电成本相同时的气化炉单元临界投资比。其中,对输运床空气气化系统的分析表明,无论是否考虑CO2捕集,均应采用煤气余热锅炉冷却方式。For integrated gasification combined cycle （IGCC）, the introduction of CO2 capture would significantly affect the choice of system syngas cooling method. Oxygen-blown and air-blown transport gasifiers based IGCC systems with and without CO： capture were developed to investigate the relative costs and benefits of water quench and syngas cooler. Results show that, syngas cooler is preferred for both oxygen-blown and air-blown systems without CO2 capture. When the CO2 capture is considered, the system net efficiency of oxygen-blown system with syngas cooler is higher than that with water quench by about 1.38 percentage points. However, the oxygen-blown systems with these two syngas cooling methods have almost the same cost of electricity （COE）. For air-blown systems with CO2 capture, the system with syngas cooler still has significantly higher efficiency and lower COE than that with water quench. The influences of investment of gasifier units with different syngas cooling processes on systems COE are also investigated. Critical investment ratios are achieved for oxygen-blown system. Analysis results show that syngas cooler is more suitable for air-blown system with or without CO2 capture.

关 键 词：整体煤气化联合循环(IGCC)输运床气化炉 空气气化 氧气气化 CO2捕集 煤气冷却 

分 类 号：TK121[动力工程及工程热物理—工程热物理]