对用烃类和氨为还原剂的脱硝技术的计算分析  

Calculation and Analysis of Denitration Technology with Hydrocarbons and Ammonia Serving as a Reducing Agent

作　　者：张彦文[1] 蔡宁生[1] 

机构地区：[1]清华大学热科学与动力工程教育部重点实验室,北京100084

出　　处：《热能动力工程》2006年第6期623-627,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点基础研究发展计划(973)基金资助项目(2006CB200305)

摘　　要：采用Chemkin4.0软件包中塞状流反应器和Miller等人的化学动力学模型,对再燃、先进再燃、选择性非催化还原(SNCR)以及加入烃类的SNCR反应的原理进行了模拟计算和比较分析,研究了不同反应温度、再燃燃料比和停留时间对脱硝效率的影响。计算结果表明,先进再燃引入氨基还原剂,可以拓宽脱硝的有效温度区间,加快反应速率,提高脱硝效率约20%,优于常规再燃技术;SNCR反应中加入很少量烃类(烃/NO<1)可以增加其有效的脱硝温度范围,加快脱硝反应速率,使完成脱硝反应所需时间缩短一半,在较低的反应温度下达到较高的脱硝效率;而先进再燃达到相当的脱硝率则需要消耗超过15%的再燃燃料。Through the adoption of a plug flow reactor in Chemkin 4.0 software package and chemical dynamic models established by Miller (1989) and others, a simulation calculation and contrast analysis have been conducted of the principle of reburning, advanced reburning, SNCR (selective non-catalytic reduction) and hydrocarbon-added SNCR reactions. In this connection, the effect of different reaction temperatures, reburning fuel ratios and residence time on denitration efficiency has also been studied. The calculation results show that the advanced reburning with the introduction of an amido reducing agent is better than conventional reburning technology, because it can broaden the effective temperature range for the denitration process, accelerate the reaction speed and enhance denitration efficiency by about 20%. The addition of a very small quantity of hydrocarbon (hydrocarbon/NO<1) in the SNCR reaction can widen the effective denitration temperature range, speed up the denitration reaction rate, shorten the time required for completing the denitration reaction by one half and attain a comparatively high denitration efficiency at a relatively low reaction temperature. However, the advanced reburning will need over and above more than 15% of reburning fuel to reach a corresponding denitration efficiency.

关 键 词：氮氧化物 还原 脱硝 再燃 先进再燃 SNCR 

分 类 号：TK16[动力工程及工程热物理—热能工程]