煤气化特性优化及低碳联合循环发电系统集成研究  

Study on optimization of coal gasification characteristics and integration of its low carbon combined power generation system

作　　者：张浩儒 张国强 余建豪 刘铭宇 ZHANG Haoru;ZHANG Guoqiang;YU Jianhao;LIU Mingyu(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《热力发电》2024年第7期91-100,共10页Thermal Power Generation

基　　金：国家科技重大专项(J2019-I-0009-0009)。

摘　　要：为了探究煤气化过程中氧气添加量和气化介质添加种类对于煤气化效率的影响,以及煤气化整体联合循环(IGCC)发电系统的集成优化,将以2种含氧量差别较大的煤种为例进行模拟分析。首先基于平衡反应模型对比了2煤种在不同总氧碳化学计量比(考虑煤自身含氧量)情况下对气化特性的影响结果;之后分析了分别添加CO_(2)与蒸汽作为气化介质时气化特性的变化规律,优化了其气化特性;最后在此基础上考虑CO_(2)捕获,提出了一种CO_(2)辅助气化、纯氧燃烧、部分烟气再循环的新型IGCC发电系统,并对其燃气轮机模型进行了模拟优化。结果表明:总氧碳化学计量比为0.47时煤气化的特性最佳;在此最佳总氧碳化学计量比条件下,添加CO_(2)作为煤气化流程气化介质,相比于传统添加蒸汽作为气化介质,可以使冷煤气效率提升约1.3%;基于此气化方法集成新型IGCC系统与传统燃烧前脱碳的IGCC发电方式相比,其净发电效率提高了约1.5%,?效率提高了约1.7%,该研究为设计低碳高效的IGCC发电系统提供了新思路。In order to investigate the effects of oxygen addition amount and type of gasification medium on coal gasification efficiency as well as the optimization of integrated gasification combined cycle(IGCC)power system,a simulation analysis is carried out by baking two kinds of coals with significant differences in oxygen content as the examples.Firstly,based on the equilibrium reaction model,the influence of oxygen carbonation stoichiometric ratios(considering the oxygen content of different coal types)on gasification characteristics for different coal types is compared.Then,the gasification characteristics are analyzed and optimized when CO_(2)and steam are added as gasification media respectively.On this basis and considering CO_(2)capture,a novel IGCC power cycle system with CO_(2)-assisted gasification,pure oxygen combustion and partial gas recirculation is proposed and analyzed,and the gas turbine model is simulated and optimized.The results show that,the coal gasification performance is the best when the total oxygen-carbonation stoichiometric ratio is around 0.47.Under this condition,adding CO_(2)as the gasification medium can increase the efficiency of cold gas by about 1.3%,compared with that of the conventional way that adding steam as the gasification medium.Compared with the conventional IGCC power system with pre-combustion decarbonization,the net power efficiency of the proposed system increases by about 1.5%and the exergy efficiency increases by 1.7%,which provides a new idea for designing a low-carbon and efficient IGCC power generation system.

关 键 词：煤气化特性 总氧碳化学计量比 低碳 IGCC 系统集成优化 

分 类 号：TM611.3[电气工程—电力系统及自动化]