低浓度甲烷流向变换催化燃烧的研究

甲烷在煤矿工业中被称作为瓦斯，在富含甲烷的矿井中甲烷的体积分数为0．1％～1．0％，在煤矿开采过程中甲烷的体积分数达到5％～15％就会造成瓦斯爆炸。如果能够将煤矿中的甲烷抽取出来利用，不但可以减少矿难事故的发生，而且能够提供更多可利用的清洁能源。因此，如何将此低品位的资源转化为可利用的能源，具有重要的研究价值。另外，甲烷的温室效应是CO2的21倍。因此，将伴随某些工业生产以及石油开采过程产生的低浓度甲烷直接排放到大气中，势必会造成严重后果。

Investigation of catalytic combustion of low concentration methane in reverse flow reactor

The catalytic combustion of low concentration methane was systematically investigated in a pilot scale reverse flow reactor. The influences of cyclic period, the concentration of reactant and the space velocity on the operation performance of reactor were studied. The experimental results showed that, for the reverse flow reactor, cyclic period, the concentration of reactant and the space velocity were three important operation parameters that obviously affected the axial temperature profiles of reactor. It′s possible to maintain autothermal operation with high conversion of methane even though the methane concentration decreased to 0.5%. When the methane concentration was increased up to 0.8%, the highest temperature of catalyst bed was beyond 700 ℃. It suggests that the energy of the hot gas should be recovered and this reactive technology is able to be used in power production with low concentration methane.