关键词: 合成气甲烷化, 合成天然气, 甲烷化工艺, 绝热固定床

Abstract: Compared with other coal-to-chemicals routes, Coal to SNG is characterized by synthesis gas methanation. In view of reactor type, syngas methanation processes can be classified into adiabatic fixed bed process, isothermal fixed bed process, fluidized bed process and slurry bed process. Adiabatic fixed bed process has been proven in industrial application and has been widely used in Coal to SNG projects. Adiabatic fixed bed processes are introduced and five specific processes are analyzed and compared in terms of process, technology characteristics and application situation. Domestic adiabatic fixed bed technology has reached the same level of foreign processes, ready for commercialization. But further research is required on energy saving, consumption reduction and catalyst life. Furthermore, isothermal fixed bed process, fluidized bed process and slurry bed process are also introduced. Their existing problems and further research points are analyzed. As to isothermal fixed bed process, attention should be paid to reaction temperature control and reactor development. Research on fluidized bed process should be focused on the development of catalyst with high strength and engineering scale-up. About slurry bed process, efforts should be made to increase CO conversion rate and decrease catalyst loss.

Key words: synthesis methanation, synthetic natural gas, methanation process, adiabatic fixed bed