【作者】 李喆；

【导师】 徐国胜；

【作者基本信息】 西安理工大学 ， 环境工程， 2007， 硕士

【摘要】 氮氧化物是造成大气污染的主要污染源之一。选择性催化还原(SCR)是目前国际上应用最广泛、技术最成熟的高效烟气脱硝工艺。而我国SCR技术研究起步较晚，迅速壮大的烟气脱硝市场现今完全被国外企业所垄断，SCR技术国产化迫在眉睫。因此，研发一套SCR模拟中试研究平台，结合SCR催化剂的平行开发，为最终开发出符合我国国情的具有自主知识产权的全套SCR烟气脱硝技术奠定基础，具有十分广阔的市场效益和环境效益。本文以普通工业窑炉烟气脱硝为切入点，结合前人的研究成果和实践经验，以化工原理为基础，借鉴各类化工工艺流程，设计、建造了一套近似实际工况、可全面开展SCR各关键技术单项及综合研究的SCR烟气脱硝模拟中试研究系统。该系统具备以下功能及特点：(1)系统可提供试验范围内的各类源烟气，保证各类研究在近似实际烟气条件下开展，且主烟气直接由燃烧器供给，稳定可靠，温控连续，NO_x浓度可通过自主开发的NO_x发生装置按需准确配给，从源头上保障了研究成果的宽覆盖面及可靠性；(2)自行设计的喷氨系统可实现氨氮比在0.6～1.6范围内的连续可控投加，对应各类催化剂，可综合研究喷氨方式、喷氨量、雾化效果、氨逃逸率及脱硝效果的影响规律，为工业系统的喷氨系统设计及专属催化剂的运行参数确定提供支持；(3)通过改变静态混合器中混合元件的单元结构、组数及位置可开展“混合”这一重要单元的综合研究，进行工业混合器的优化设计，为经济、高效地达到理想的混合效果奠定基础；(4)通过各类气流分布组件的组合，利用专有气流分布检测系统进行测试，可综合开展SCR烟气脱硝系统的流场调控研究，结合数值模拟计算，为最终快速、准确地进行工业装置的气流分布优化设计提供技术支撑；(5)反应器内可自由装设一至三层各类规格的脱硝催化剂，可综合开展催化剂的工业化活性试验研究及运行规律研究，为早日开发出我国自有的高效商业整体式脱硝催化剂、完成SCR全套工艺设计的国产化提供基础平台。此外，本文还对SCR脱硝催化剂的制备进行了初步的探索，依据前人的研究成果进行了催化剂的试制，并采用扫描电镜对制备出的催化剂样品进行了表征研究，为找到符合SCR反应要求的活性成分及相应的载体的匹配及制备工艺的选择做了些许探索。更多还原

【Abstract】 The nitrogen oxide (NO_x) is one of the main pollution sources which result in air pollution. The Selectivity Catalyst Reduction (SCR) which currently is the most wide used efficiently technique applies in flue gas denitrification. But the technical research of SCR of our country starts relatively late, the strengthened rapidly flue gas denitrification market and is totally monopolized by the overseas enterprise now, SCR technological production domesticization is extremely urgent. So, research and develop one and SCR simulating pilot plant scale experimental study platforms, combine the parallel development of SCR catalyst, flue gas denitrification technology and establish the foundation in order to develop flue gas of complete SCR with independent intellectual property right which accords with the national conditions of our country finally, have very wide market benefit and environmental benefit.This text flue gas denitrification as the breakthrough point with the ordinary flue gas of industrial kiln, combine forefathers’ research results and practical experience, based on chemical principle, draw lessons from all kinds of chemical technological process, design, build one approximate actual operating mode, can launch SCR every key technology individual event and research of SCR flue gas denitrification simulating pilot plant scale experimental study system in an all-round way. This system possesses the following function and characteristic:(1) The system can offer the experiment all kinds of research is launched under the approximate real flue gas condition, and the main flue gas is supplied from the burning device directly, it is reliable to be steady, accuse of it in succession warmly, NO_x density can press and need accurate ration through NO_x that is developed independently, have ensured the wide coverage rate and dependability of the research results from source;(2) The ones that designed gushed out the ammonia system and can realize the ammonia nitrogen than shooting adding continuously and controllably in 0.6-1.6 ranges by oneself, all kinds of corresponding catalyst, very comprehensive research gushes out ammonia way, amount of ammonia gushed out, the ammonia slip and influence of flue gas denitrification efficiency, confirm the support of offering for the operation parameter which gushes out ammonia system designing and exclusive catalyst of industry’s system;(3) Can be launched through changing the unit structure, group counting and position of mixing the component in the static mixer of behavior "Mix" Comprehensive research of this important unit, carry on the optimization design of the industry mixer, for economy, reach the ideal result of mixing and establish the foundation high-efficiently;(4) Distribute the association of the package through all kinds of air currents, utilize the exclusive air current to distribute the detection system to test, can launch SCR flue gas and take off the flowing in feld and adjusting and controlling and studying of the nitre system synthetically, combine the numerical simulation to calculate, offer technical support for the fact that the air current of carrying on the commercial plant fast, accurately;(5) Can install denitrification catalyst of a all kinds of specifications to the third Floor freely in the reactor, can launch the industrialized active experimental study of the catalyst and operate the law to study synthetically, of high-efficient commerce in our country for the fact that will develop the own integral production domesticization that denitrification catalyst, finishes complete technological design of SCR of high-efficient commerce in our country as soon as possible.In addition, this text has also carried on preliminary exploration to preparation of SCR denitrification catalyst, having carried on the trial-production of the catalyst according to forefathers’ research results, adopting and scanning the electric mirror will signify research to the catalyst sample preparing out, for is it accord with SCR react active composition and corresponding match and choice, preparation of craft of carrier of demand make some explore to find.更多还原