浓淡燃烧低NOx生成机理及模拟研究.doc

专业提供学术期刊、学位论文下载、外文文献检索下载服务 购买地址: 摘  要 随着我国城市天然气的迅猛发展  各种民用燃具日益增多  燃具燃烧产生的 NOx 对室内环境有着严重的污染 NOx 污染的严重危害越来越受到社会的普遍重 视 室内污染的概念也得到了人们的逐步认识 由于民用燃具是室内污染的主要污 染源  本文探讨浓淡燃烧技术应用于民用燃具 对该燃烧方法降低 NOx 的效果进 行了研究 本文首先介绍了 NOx 的来源和危害  以及国内外低 NOx 燃烧技术研究现状 然后从理论上论述了 NOx 的生成机理和抑制途径 并且对甲烷燃烧时 NOx 生成的 机理进行了简化处理 本文重点介绍了浓淡燃烧理论  浓淡燃烧是一种较新的低 NOx 燃烧技术 所 谓浓淡燃烧 是指在同一个燃烧器上将浓火焰和淡火焰有机的组合起来 有效的控 制氮氧化物的生成条件 以减少氮氧化物的排放 浓火焰燃烧形式为部分预混燃烧 淡火焰的燃烧形式为全预混燃烧 通过理论分析表明 将二者有机的结合在一起时 可以在很大的程度上降低氮氧化物的生成 通过对浓淡燃烧采取数值模拟的理论分析 得出浓淡燃烧最佳的一次空气系数 的配比  浓火焰的一次空气系数是 0.6 0.7  淡火焰一次空气系数 1.6  1.7  这种 配比使燃烧充分而稳定  同时很好的抑制了氮氧化物的生成 最后 指出采用合理的一次空气系数的配比 能够有效的降低氮氧化物的生成 量 关键词 浓淡燃烧  氮氧化物  一次空气系数  数值模拟 I Abstract With the development of natural gas industry,all kinds of domestic appliances have been increasing. At the same time, with the application of natural gas, NOx emission from gas appliances do harm to the health. The severe hazard of NOx pollution is widely realized worldwide, and the concept of indoor pollution is gradually accepted. With the purpose to solve the problem of indoor NOx pollution, conducted to study the low-NOx effect of offstoichiometric combustion technology to domestic appliances. At the beginning of the article, the components, hazards and sources of NOx are stated, and the current research status of low-NOx combustion technology home and abroad is introduced. Afterwards, the formation mechanism of NOx and the corresponding abatement measurements are systematically analyzed, and simplifying the formation mechanism of NOx in the course of CH4 combustion. Off-stoichiometric combustion is one of technology, which control NOx emission through making rich flame and lean flame burn in firebox at the same time. The combustion form of rich flame is part-premixed combustion and lean flame is premixed combustion. In our country, this technology is still being Studied. In this paper, the means of theory analysis (numerical simulation included) are used. By numerical simulation of Of