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采用反应管对基于过渡金属氧化物载氧体的煤矿通风瓦斯(VAM)处理性能展开了研究.结果表明,经活化后的三种载氧体均能将CH_4完全转化为CO_2,其活性顺序为CuO60/γ-Al_2O_3>Ni O60/γ-Al_2O_3>Fe2O360/γ-Al_2O_3;基于CuO60/γ-Al_2O_3的CH_4转化率随空速的增加而减小,随CuO负载量和床层温度的升高而增大;煤矿通风瓦斯中的CH_4浓度越低,CH_4转化率达到90%所需的床层温度就越低;对活性物质低分散高负载的CuO60/γ-Al_2O_3和活性物质高分散低负载的CuO5.5/γ-Al_2O_3两种CuO/γ-Al_2O_3系载氧体进行了比较,发现两种载氧体的CH_4转化机理均包含有化学链燃烧和催化燃烧两种机理,基于催化燃烧机理的CH_4转化率在一定温度下存在极大值,当床层温度高于该极大值温度时,化学链燃烧对CH_4转化率的贡献明显大于催化燃烧对CH_4转化率的贡献;相同条件下,CuO5.5/γ-Al_2O_3的初期活性优于Cu60/γ-Al_2O_3,但CuO60/γ-Al_2O_3的活性稳定性优于CuO5.5/γ-Al_2O_3.
The reaction tube was used to study the treatment performance of VAM based on transition metal oxide oxygen carrier.The results showed that CH_4 could be completely converted into CO_2 by activated three oxygen carriers and the order of activity was CuO60 / γ-Al_2O_3> Ni O60 / γ-Al_2O_3> Fe2O360 / γ-Al_2O_3. The conversion of CH_4 based on CuO60 / γ-Al_2O_3 decreases with the increase of space velocity. With the increase of CuO loading and bed temperature The lower the CH_4 concentration in coal mine ventilation gas is, the lower the bed temperature required for the conversion of CH_4 to 90%; the low dispersion and high loading of active material CuO60 / γ-Al_2O_3 and the active material with high dispersion and low load CuO5.5 / γ-Al_2O_3 two types of CuO / γ-Al_2O_3 system oxygen carrier were compared and found that the two types of oxygen carrier CH_4 conversion mechanism includes both chemical combustion and catalytic combustion chain catalytic mechanism based on the catalytic combustion When the bed temperature is higher than the maximum temperature, the contribution of chemical combustion to CH 4 conversion is significantly greater than the contribution of catalytic combustion to CH 4 conversion. Under the same conditions, the conversion of CuO 5 The initial activity of .5 / γ-Al_2O_3 is better than that of Cu60 / γ-Al_2O_3, but the initial activity of CuO60 / -Al_2O_3 activity stability is better than CuO5.5 / γ-Al_2O_3.