摘要
利用携带流反应器研究再燃燃料种类(稻秆、麦秆、棉花秆、稻壳、麦秆焦)、再燃燃料比Rff、再燃区反应温度t2、再燃区过量空气系数α2、再燃燃料粒径dp等因素对脱硝效率的影响,分析了麦秆焦异相还原NO对总脱硝效率的贡献。结果表明:4种生物质中棉花秆脱硝效果最好,麦秆次之,稻壳和稻秆较差;在相同α2下,t2=900～1100℃内,生物质再燃脱硝效率随着t2的提高而增加;对于粒径小于425μm生物质再燃燃料,其再燃脱硝效率随粒径减小略有增加;随着α2的降低和Rff的提高,生物质再燃脱硝效率均呈现先上升后下降的趋势,在α2=0.7～0.8,Rff=20%～25%条件下,可以获得较高的脱硝效率,各种生物质再燃脱硝效率均在50%以上;在Rff=10%～26%,麦秆焦异相还原NO的贡献在59%～68%,且呈现中间低两头高的趋势。
Effects of biomass types（such as rice straw,wheat straw,cotton stalk,rice husk and wheat straw char）,reburning fuel ratio Rff;reaction temperature in the reburning zone t2;stoichiometric ratio in the reburning zone α2 and particle sizes of reburning fuel dp on NO reduction efficiency during biomass reburning were investigated in an entrained flow reactor.The contribution of NO heterogeneous reduction by wheat straw char to the total NO reduction was analyzed.Results indicate that cotton stalk behaves the best performance of NO reduction for tested four kinds of biomass;followed by wheat straw;the rice husk and rice straw are less effective.NO reduction efficiency increases with increasing of reaction temperature in the reburning zone at the same α2 and in the range of t2=900～1 100℃.NO reduction efficiency increase insignificantly with decreasing of biomass particle sizes while dp425 μm.NO reduction efficiency of biomass reburning behaves a trend of first increase and then decrease with decreasing of α or increasing of Rff.The higher NO reduction efficiency（more than 50%） can be achieved at the range of α2=0.7～0.8 or Rff=20%～25% during reburning by four kinds of biomass.The contribution of NO heterogeneous reduction by wheat straw char to the total NO reduction is in the higher range of 59%～68% while Rff is in the range of 10%～26%.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第26期101-106,共6页
Proceedings of the CSEE
基金
国家自然科学基金(51076067)
江苏省自然科学基金资助项目(BK2007532)~~
关键词
生物质
再燃
脱硝
NO
异相还原
biomass
reburning
denitrification
NO
heterogeneous reduction
