焦炭体系下二氧化碳重整甲烷制取合成气

Carbon Dioxide Reforming of Methane to Produce Syngas with Coal Char

利用连续流动固定床反应器,研究了不同煤种制得的焦炭及反应器的操作参数对CH4和CO2转化率的影响,并用比表面孔径测定仪和扫描电镜对反应前后焦炭进行表征.研究结果表明:采用的几种样品中,灰分含量最低的铜川煤焦催化活性最好;但是在不同焦炭上反应气转化行为相似,初始转化率比较高,30 min后降低至一个相对平稳的阶段;较低的反应气流速和较高的反应温度有利于反应气的转化;焦炭粒径在0.53 mm以下适合进行动力学研究;反应后焦炭比表面积有所降低,反应过程中部分焦炭发生了气化.

The fixed bed reactor was applied to study the influence of different chars and operation parameters on reactant gas conversion. The characteristics of char samples were also analyzed using the surface area and porosity analyzer and the SEM analyzer. The results show that Tongchuan char with the lowest ash concentration exhibits the highest activity, and all the char samples show similar behaviors. A higher conversion is always achieved at the beginning, and then it decreases and levels off at a stable value after 30 min. Lower flow rate and higher temperature are favorable to reactant gas conversion. The reaction kinetics can be obtained with the particle diameter of 0. 53 mm and below. BET surface area of char decreases after reaction and gasification reaction also occurs during the reforming process.