添加生物油对垃圾焚烧烟气选择性非催化还原脱硝的强化作用及其机理  

Characteristics and mechanism of bio-oil enhanced waste incineration SNCR denitrification

作　　者：陈金宝 罗俊伟 杨文海 张世红[1] 邵敬爱[1,3] 廖新杰 陈汉平 CHEN Jinbao;LUO Junwei;YANG Wenhai;ZHANG Shihong;SHAO Jingai;LIAO Xinjie;CHEN Hanping(State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Wuhan Boiler Energy Engineering Co.Ltd,Wuhan 430070,China;Department of New Energy Science and Engineering,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院煤燃烧国家重点实验室,武汉430074 [2]武汉武锅能源工程有限公司,武汉430070 [3]华中科技大学能源与动力工程学院新能源科学与工程系,武汉430074

出　　处：《环境工程学报》2021年第11期3589-3597,共9页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2016YFB0600203)。

摘　　要：为揭示添加生物油对垃圾焚烧选择性非催化还原(SNCR)脱硝特性的影响规律及作用机理,利用高温管式炉开展了实验,以研究生物油添加比例(β)、氨氮比(NSR)及氧浓度对SNCR脱硝特性与CO排放的影响;结合SNCR基元反应与生物油热分解产物的成分,分析了添加生物油对烟气选择性非催化还原脱销的强化作用机理。结果表明,添加生物油能拓宽SNCR的温度窗口,在700~900℃时可明显提升脱硝效率,当β=10%时,脱硝效率平均提升约21%。在SNCR过程中,CO排放随生物油添加比例的增加而增加,但温度在800℃、氧浓度在4%以上时,基本无CO排放。生物油在高温下的分解产物主要为H_(2)、CO及CH_(4)等。添加生物油主要通过热分解生成小分子气体,同时产生大量H·、O·、HO_(2)·及·OH等自由基来强化低温下SNCR脱硝反应。本研究结果表明,在垃圾焚烧电站中,可通过在900℃下适当添加生物油来提升SNCR效率。To reveal the effect and the mechanism of adding bio-oil on the denitration characteristics of waste incineration selective non-catalytic reduction(SNCR),we studied the effects of bio-oil addition ratio(β)ammonia-nitrogen ratio(NSR)and oxygen concentration on SNCR characteristics and CO emissions in a hightemperature tube furnace.Combining SNCR primitive reaction with the analysis of bio-oil thermal decomposition products,the mechanism was analyzed.The results show that the addition of bio-oil can broaden the SNCR temperature window and significantly improve the denitration efficiency in the temperature range700~900℃,whenβ=10%,the denitration efficiency increases averagely by about 21%.During the SNCR process,CO emissions improve evidently with the increase of bio-oil addition ratio,but when the temperature is above 800℃and the oxygen concentration is above 4%,there is almost no CO emission.The decomposition products of bio-oil at high temperature are mainly H_(2),CO and CH_(4),etc,the bio-oil under high temperature will break into small molecular gases and simultaneously generates a large amount of free radicals such as H,O,HO_(2) and OH to strengthen the SNCR denitration reaction at low temperature.Therefore,in the waste incineration power plant,the SNCR efficiency can be improved by adding appropriate bio-oil in the area below 900℃.

关 键 词：垃圾焚烧脱硝 选择性非催化还原 生物油添加剂 CO排放 

分 类 号：X511[环境科学与工程—环境工程]