生物质再燃脱硝特性研究  

Research on Biomass Reburning Denitration Characteristics

作　　者：高攀[1] 路春美[1] 阮磊[2] 刘志超[3] 

机构地区：[1]山东大学能源与动力工程学院,山东济南250061 [2]济南市南郊热电厂丁字山热源分厂筹建处,山东济南250002 [3]山东电力研究院热能研究所,山东济南250002

出　　处：《热能动力工程》2008年第4期429-433,共5页Journal of Engineering for Thermal Energy and Power

基　　金：山东省自然科学重点基金资助项目(Z2006F04);山东省环境保护重点科技基金资助项目(2006046)

摘　　要：利用多功能脱硝实验台，在再燃脱硝的典型影响因素条件下研究了杨木屑、花生壳、稻壳和玉米秸秆的再燃脱硝特性。实验表明：700-900℃时，提高再燃温度，生物质挥发分析出速度快速增加，脱硝率亦随之迅速提高，900℃之后挥发分析出达到饱和状态，较高的炉温易使生物质受热结焦并增大了炉膛正压，使得脱硝率略有下降。过量空气系数（SR）对实验物料再燃脱硝的影响规律比较相近，4种生物质均在SR=0.8时取得最高脱硝效率。相同条件下生物质粒径越小、初始NO浓度越大，再燃脱硝效果越好，较大的再燃比（RFR）可在一定程度上补偿再燃物料粒径及初始NO浓度带来的脱硝率差异。延长再燃区停留时间t有利于提高脱硝率，但t〉0．81s后，对脱硝率的影响不再显著。A multi-purpose denitration test rig was utilized to study the reburning denitration characteristics of aspen wood sawdust,peanut shell,rice husk and cornstalk under the condition of typical influencing factors on reburning denitration. The test results show that when the furnace temperature is between 700～900 ℃,increasing the reburning temperature will result in a rapid increase of the precipitation speed of volatile matter in biomass followed by a quick enhancement of the denitration rate. At a temperature higher than 900 ℃,the precipitation of the volatile matter attains a saturation state and a relatively high furnace temperature tends to make the biomass to be heated,which leads to coke formation,enhancing the positive pressure of the furnace and causing the denitration rate to drop somewhat. The stoichiometric ratio (SR) has a relatively similar influencing effect for the reburning denitration of the materials under experiment. Four kinds of biomass all attain their highest denitration efficiency when SR=0.8. Under the same conditions,the smaller the biomass particle diameter,the greater the initial NO concentration and the better the reburning denitration effectiveness. A relatively big reburning fuel ratio (RFR) can compensate to a certain extent the difference in the denitration rate brought about by the reburning material particle diameter and initial NO concentration. To extend the residence duration t in the renurning zone is favorable to enhancing the denitration rate. However,when t > 0.81 second,its influence on the denitration rate will not be significant.

关 键 词：生物质 再燃 脱硝率 实验 

分 类 号：TK16[动力工程及工程热物理—热能工程]