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OALib Journal期刊
ISSN: 2333-9721
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超低浓度甲烷在cu/γ-al2o3催化颗粒流化床中的燃烧特性
, PP. 886-891
Keywords: 超低浓度甲烷,流化床,催化燃烧,甲烷转化率,动力学
Abstract:
？采用流化床燃烧技术,使用自制cu/γ-al2o3颗粒作为催化剂床料,实验研究了超低浓度甲烷在流化床中催化燃烧时床层温度(450~700℃)、流化风速比ω(1.5~4)、进气甲烷体积分数(0.3%~2%)等对甲烷燃烧效率的影响。结果表明,床层温度是影响甲烷催化燃烧反应的关键因素,甲烷的转化率随着床层温度的升高而增加;床层温度达到650℃时,甲烷含量低于1%的超低浓度甲烷其转化率超过95%,继续提高床层温度至700℃且控制流化风速比ω≤2可以实现甲烷的完全转化;甲烷转化率随着流化风速和进气甲烷浓度的增加而降低,当ω>3.5时,温度对甲烷转化的影响减弱,未燃烧的甲烷含量增大。动力学实验发现,床层温度较低时,催化反应受动力学控制,测得催化反应的活化能ea为1.26×105j/mol,反应级数m为0.73,当温度t>450℃时,扩散作用影响显著,反应级数增大。
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