【摘要】 燃煤过程中燃料型氮氧化物主要包括挥发分和焦炭的贡献,其各自贡献比率以及各种燃烧因素,如煤质、燃烧温度、气氛等对贡献比率的影响仍缺乏研究,尤其是在和实际工业煤粉燃烧条件的高温环境下的比率规律更是研究甚少。然而,挥发分和焦炭NO生成的相互关系对燃煤NO生成和控制机理是非常重要的,一方面,为燃煤低NOx排放控制技术发展提供了直接理论依据;另一方面,可为NOx精确模拟计算提供基础数据的验证和模型发展。为此,通过在高温自动进料固定床实验系统上设计了一套特殊实验,可以把挥发分和焦炭的燃烧分离以便记录各自的NO生成量。同时也进行了二者无分离的传统燃烧作为对比。实验结果显示,分离燃烧中,随温度升高,NO释放速率提高,燃料NO释放量减少,挥发分NO占燃料NO比例先增后减,各温度条件下,随煤阶升高挥发分NO比例依次降低。更多还原

【Abstract】 The release of fuel-NO during coal combustion include the contribution of volatile and char,however,the study of the relative contributions of volatile-N and char-N to the total NO emission during high temperature combustion has been seldom studied.The interaction between volatile and char is significant to the release of coal NO during coal combustion and control mechanism.In this paper,a high temperature automatically feed fixed bed experimental system has designed for a special experiment,which can separate volatile combustion and char combustion to record each NO production.As a comparison,we also take a study on traditional combustion with no separation.The results show that as temperature increasing during the separate combustion,NO release rate increasing,fuel-NO release reduce,volatile-NO accounted for the proportion of fuel-NO decreased after increasing.Furthermore,under various temperature conditions,volatile NO proportion decreased with coal rank increasing.更多还原