NTP活化助燃空气降低垃圾焚烧中NO_(x)排放研究  

Investigation on De-NO_(x) Effect in Municipal Solid Waste Incineration Process by Supplying NTP Activated Combustion Air

作　　者：贺靖龙 洪鎏[1,2] 周洪权 陈德珍[1,2] He Jinglong;Hong Liu;Zhou Hongquan;Chen Dezhen(Thermal and Environmental Engineering Institute,School of Mechanical Engineering,Tongji University,Shanghai 200092,China;Shanghai Engineering Research Center of Multi-Source Solid Wastes Co-Processing and Energy Utilization,Shanghai 200092,China)

机构地区：[1]同济大学机械与能源工程学院热能与环境工程研究所,上海200092 [2]上海多源固废协同处理和能源化工程技术研究中心,上海200092

出　　处：《燃烧科学与技术》2023年第1期85-93,共9页Journal of Combustion Science and Technology

基　　金：上海市科委国际合作项目(20230712900);国家自然科学基金资助项目(51776141)。

摘　　要：为达到在燃烧过程中控制NO_(x)等气态污染物生成的目的,利用低温等离子体(NTP)将空气活化后,作为垃圾焚烧的助燃风,并考虑分级空气活化等不同工况,研究NO_(x)等气态污染物生成的变化情况.发现在相同物料燃烧工况下,空气经等离子体活化后助燃能加速燃烧反应进程,尤其在垃圾升温开始燃烧阶段引入活化的一次风助燃可缩短约23.8%的燃烧时间,烟气中NO_(x)总排放量降低可达85%.结合化学反应动力学对NTP活化助燃空气降低垃圾焚烧过程中NO_(x)生成机理进行初步探索,发现将NTP活化空气生成的活性基元(O、OH、H等)引入燃烧系统能够显著加速燃烧反应进程,同时促进NO及其前驱物的还原和分解,从源头上控制NOx等污染物生成.此外本研究还对比了二次风活化以及在高温区供入活化风降低NOx的效果,推荐了活化空气的加入区段.研究提供了一种经济有效且简单可行的NO_(x)控制思路,对进一步降低垃圾焚烧的气态污染物源头生成、简化烟气净化系统有重要意义.In order to control the generation of gaseous pollutants such as NO_(x) in the combustion process,nonthermal plasma(NTP)is used to activate the air as combustion air for municipal solid waste incineration(MSWI).Different conditions are considered in this paper,including the activation of primary air,secondary air and all combustion air. The generation of gaseous pollutants such as NOxunder these conditions is studied and compared with the conventional air combustion. The results show that under the combustion of the same material,with the introduction of activated primary air to assist combustion,the reaction process is sped up,especially at the stage when the waste heats up and starts to burn. The combustion time is shortened by about 23.8% and the total NO_(x) emissions are reduced by up to 85%.The mechanism and kinetic scheme of reducing the NO_(x) emission by combustion air activation with NTP are investigated in combination with chemical reaction kinetics. It is found that the introduction of active radicals such as O,OH and H can significantly accelerate the process of combustion,promote the decomposition of NO and its precursors,and inhibit the generation of NO_(x) pollutants from the beginning. In addition,the de-NO_(x) effects of secondary air activation and supplying activated air in the high temperature zone are compared in this paper,and the addition section of activated air is recommended. This study provides a cost-effective,simple and feasible idea of NOxremoval,which is of great significance for further reducing the generation of gaseous pollutants in waste incineration and simplifying the flue gas purification system.

关 键 词：垃圾焚烧 助燃空气 活化 低温等离子体 氮氧化物 

分 类 号：X705[环境科学与工程—环境工程]