甲烷和二氧化碳在煤焦上反应制备合成气实验研究

以煤与甲烷共转化制备合成气的研究为背景，通过考察固定床反应器上甲烷和二氧化碳分别在石英砂、煤灰和煤焦上的反应过程，证实了煤焦中的碳结构在共转化过程中对甲烷转化具有催化作用。同时考察了反应温度（1073K～1223K）、CH₄/CO₂比（0.33~3.00）和气固接触时间等工艺条件对甲烷转化率、气相产物中H₂/CO比的影响。结果表明,甲烷的转化率随着反应温度和气固接触时间的增加而增大，随CH₄/CO₂比的增加而减小。在考察范围内甲烷的转化率最高达到了86%。反应物中CH₄/CO₂比的改变可以起到调节产品气中H₂/CO比的作用，0.4~2.0调节。

Production of syngas from reforming of methane and carbon dioxide over coal char in a fixed-bed reactor

Based on coal gasification combined with methane reforming process, the reaction of methane and carbon dioxide was investigated over quartz sand, coal ash and char, respectively, in a fixed bed system. It was proved that coal char has distinct catalytic effect on methane conversion during the coal gasification combined with methane reforming process. Other experiments were carried out with sets of operation conditions including temperature ranging from 1073K to 1223K , the inlet CH_4/CO_2 ratio increasing from 0.33 to 3.00 and the gas-solid contact time varying from 0.13(g·min)/mL to 1.04(g·min)/mL. The results show that methane conversion increases with increasing temperature and gas-solid contact time, but decreases with increasing CH_4/CO_2 ratio. The highest methane conversion rate can get 86%. H_2/CO ratio in the product gas can be adjusted from 0.4 to 2.0 through changing the reactants' ratio of CH_4/CO_2.