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煤矿乏风分级催化氧化固碳的实验研究

DOI: 10.13334/j.0258-8013.pcsee.2015.S.017, PP. 125-131

Keywords: 煤矿乏风,蜂窝陶瓷,分级燃烧,近零排放

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Abstract:

采用溶胶凝胶法和浸渍法制备了Pd/Al2O3整体式催化剂和LaMnO3/MgO整体式催化剂,运用XRD、SEM等方法对催化剂进行表征,对催化剂催化活性及热稳定性进行评价。结果表明,对CH4浓度为0.5%的煤矿乏风,Pd/Al2O3整体式催化剂T90为441℃,LaMnO3/MgO整体式催化剂T90为547℃,前者具有良好的低温起燃活性;催化剂分别800℃焙烧24h,Pd/Al2O3整体式催化剂甲烷转化率降为87.15%,LaMnO3/MgO整体式催化剂甲烷转化率仍达到97.12%,后者具有更好的热稳定性。煤矿乏风分级燃烧,第1级设置为Pd/Al2O3整体式催化剂,第2级设置为LaMnO3/MgO整体式催化剂,可以有效降低起燃点,促进反应发生,保证高温段的热稳定性。尾部设置固碳段,预热温度为500℃,CH4浓度为1%时,尾气中CO2浓度低于0.2%,实现温室气体的近零排放。

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