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生物质再燃脱硝及其同相还原反应特性

束 韫 王洪昌 朱金伟 张 凡 黄家玉

束 韫, 王洪昌, 朱金伟, 张 凡, 黄家玉. 生物质再燃脱硝及其同相还原反应特性[J]. 环境科学研究, 2015, 28(4): 660-666.
引用本文: 束 韫, 王洪昌, 朱金伟, 张 凡, 黄家玉. 生物质再燃脱硝及其同相还原反应特性[J]. 环境科学研究, 2015, 28(4): 660-666.
SHU Yun, WANG Hongchang, ZHU Jinwei, ZHANG Fan, HUANG Jiayu. Nitrogen Oxide Reduction by Biomass Reburning and Its Reaction Characteristics of Homogeneous Reduction[J]. Research of Environmental Sciences, 2015, 28(4): 660-666.
Citation: SHU Yun, WANG Hongchang, ZHU Jinwei, ZHANG Fan, HUANG Jiayu. Nitrogen Oxide Reduction by Biomass Reburning and Its Reaction Characteristics of Homogeneous Reduction[J]. Research of Environmental Sciences, 2015, 28(4): 660-666.

生物质再燃脱硝及其同相还原反应特性

基金项目: 国家高技术研究发展计划(863)项目(2012AA062505);中国博士后基金项目(2014M561025);中央级公益性科研院所基本科研业务专项(2013-YSKY-01)

Nitrogen Oxide Reduction by Biomass Reburning and Its Reaction Characteristics of Homogeneous Reduction

  • 摘要: 利用固定床反应器研究了稻壳、木屑和玉米秸3种生物质在不同工况〔再燃温度、φ(O2)〕下的再燃脱硝效率,同时考察了再燃区出口处CO、H2、碳氢类物质(主要是CH4)、HCN和NH3的体积分数随工况的变化规律. 结果表明:生物质类型对再燃脱硝效率有很大影响,木屑再燃脱硝效率最大值达57.0%±2.1%,高于稻壳(50.0%±1.5%)和玉米秸(51.0%±1.1%). 在再燃过程中,生物质产生的热解气能够增强还原性气氛,从而提高再燃脱硝效率,当烟气中φ(O2)为0%~1%时,再燃脱硝效率较高. 在还原性气氛(800~1 200 ℃)下,3种生物质再燃脱硝效率差异主要来自生物质不同热解气与NO的同相反应. 其中,碳氢类物质对NO的还原起到了关键作用,而CO和H2所起作用并不大,φ(HCN)与φ(NH3)之和反映了气相中NO向N2的转化趋势. 因此,深入了解生物质热解气对其再燃脱硝效率的影响机制有益于燃料再燃脱硝效率的提高.

     

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  • 刊出日期:  2015-04-25

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