高压湿烟气中煤燃烧及挥发分氮迁移特性研究  

Coal combustion and volatile nitrogen migration characteristics in high pressure wet flue gas

作　　者：昝海峰 陈晓平[1] 马吉亮[1] 梁财[1] ZAN Haifeng;CHEN Xiaoping;MA Jiliang;LIANG Cai(School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《上海理工大学学报》2023年第5期425-432,共8页Journal of University of Shanghai For Science and Technology

基　　金：国家重点研发计划(2016YFB0600800)。

摘　　要：加压富氧燃烧(POFC)是一种具有巨大发展潜力的清洁高效燃烧技术。由于烟气的循环利用,烟气中的水蒸汽体积分数高于常规燃烧形式,这就丰富了烟气中的自由基池,从而影响煤燃烧过程及气态污染物的排放。利用固定床反应器进行了煤及其挥发分的POFC实验,并结合化学动力学模型研究了挥发分氮的迁移机理。研究结果表明,压力和水蒸汽的协同作用会显著影响燃烧过程,缩短燃烧时间,降低尾气中的CO体积分数,提高燃烧效率。挥发分氮来自煤中部分吡咯、吡啶和全部季胺的热解。更高的压力影响了NO形成的主要反应途径,同时增强了整体NO的还原并最终抑制NO排放。Pressurised oxy-fuel combustion(POFC)is a clean and efficient combustion technology with great potential.Due to the recycling of flue gas,the volume fraction of steam in flue gas is higher than that of conventional combustion,which enriches the free radical pool in the flue gas and thus affects the coal combustion process as well as the emission of gaseous pollutants.POFC experiments of coal and its volatiles were carried out in a fixed bed reactor,and the migration mechanism of volatile-N was studied in conjunction with chemical kinetic modeling.The results indicate that the synergistic effect of pressure and steam can significantly influence the combustion process,the combustion time is shorten,the volume fraction of CO is reduced in the exhaust gas and the combustion efficiency is improved.The volatile nitrogen comes from the pyrolysis of part of pyrrole,pyridine,and all quaternary nitrogen in coal.The higher pressure affects the main reaction pathway of NO formation,enhances the overall NO reduction and ultimately suppresses NO emission.

关 键 词：加压富氧燃烧 水蒸气 NO CO 

分 类 号：TK038[动力工程及工程热物理]