COAL FLY ASH AS AN INDUCER TO STUDY ITS APPLICATION IN THE PRODUCTION OF METHANE GAS FROM DOMESTIC WASTE

摘要

China's traditional treatment of domestic waste such as landfill, composting and incineration lias problems such as high pollutant emissions and low utilization rate. In order to realize the clean treatment and resource utilization of domestic garbage, waste gasification technology has received extensive attention from researchers at home and abroad. However. China's current energy structure is characterized by "rich coal, lean oil. and less gas.'* This energy structure determines that C'hinas energy consumption can only be dominated by coal. The conversion of coal gasification to natural gas has become an important strategic option. The use of domestic waste incthanation reaction to produce methane gas. the formation of synthetic natural gas can achieve the purpose of turning waste into a waste of life. The key issue in tlic methanation process is how to improve the selectivity and yield of methane and prevent the carbon deposition of the catalyst from deactivating. The development of efficient methanation catalysts is one of the focuses of methanation technology research. Since coal fly ash contains a large amount of silicon and aluminum sources, the supported methanation catalysts commonly have carriers Al：Oi, Si〇2, ZrO： and TiO：. Although the earner lias no catalytic activity, it has a significant eflccl on the activity of the catalyst. Therefore, in this study, coal fly ash was used as a catalyst carrier inducer for the methanation reaction of domestic waste, and Ni was used as the active component to prepare a Ni-coal fly ash (Ni-CFA) catalyst with coal fly ash carrier inducer. Tlie catalytic performance of methanation of Ni-coal fly ash used in different coal fly ash was studied. At the same time, the stability and performance evaluation of Ni-coal fly ash (Ni-CFA) catalyst were also tested. The results show that the cata-lytic performance of methanation of Ni-coal fly ash (Ni-CFA) catalyst increases with the increase of coal fly ash dosage, and Ni- coal fly ash has better carbon deposition resistance.