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CO2捕集对输运床气化炉IGCC系统煤气冷却方式选择的影响

DOI: 10.13334/j.0258-8013.pcsee.2014.23.007, PP. 3883-3891

Keywords: 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

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Abstract:

对于整体煤气化联合循环(integratedgasificationcombinedcycle,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。

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