煤与生物质燃烧中氯化物和碱金属化合物的释放模型及对NO释放的影响  

Release Models of Chloride and Alkali-metal Hydroxides during Coal and Biomass Combustion and Their Effects on NO Emission

作　　者：亢虹 孙淑凤[1,2] 郭啸峰[3] 魏小林[3] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]北京科技大学北京高校节能与环保工程研究中心,北京100083 [3]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190

出　　处：《过程工程学报》2014年第4期617-623,共7页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:91130028;51376189)

摘　　要：基于化学动力学的方法,建立了煤与生物质燃烧过程中氯化物和碱金属化合物的释放模型.以氯元素为例,将模型计算的结果与实验结果进行比较,验证了模型的可靠性.模拟生物质再燃过程时,将该释放模型补充到详细反应机理中,研究不同温度和浓度下,氯化物和碱金属化合物对NO释放的影响.结果表明,对NO的还原效果,碱金属化合物高于氯化物,NaOH高于KOH.氯化物和碱金属化合物通过影响自由基的浓度,进而影响NO的释放.以大同煤中的碱金属为例,用ηNO=AT-BT2+DC-E的形式拟合得到温度和浓度影响NO还原率的规律.Based on the chemical kinetics, a model is proposed to describe the release rate of chloride and alkali-metal hydroxides in combustion of biomass and coal, which is validated through the comparison of calculating and experimental results of chloride. In the simulation of biomass rebuming, the model is extended into detailed reaction mechanism, which is applied to analyze the effects of chloride and alkali-metal hydroxides on NO reduction rate at different temperatures and concentrations. The results show that the effect of alkali-metal hydroxides is more obvious than that of chloride; the effect of NaOH is more obvious than that of KOH. These compounds may affect NO emission via the effect on the concentrations of some radicals. Taking Datong coal as an example, the effects of temperature （T） and concentration （C） of alkali-metal hydroxides on the NO reduction rate （no） can be expressed as r/No=A T-B T2 ＋ DC-E.

关 键 词：氯 碱金属 释放模型 燃烧 NO还原 煤粉 生物质 

分 类 号：TK16[动力工程及工程热物理—热能工程]