In order to develop a method which can convert CH4 and CO2 obtained from biomass pyrolysis into syngas production,the reforming of CH4 with CO2 by a biomass char was conducted with microwave heating in this paper. The influences of particle diameter,microwave power,the molar ratio of CO2 and CH4 as well as the volumetric hourly space velocity on the CH4 and CO2 conversions were investigated,and the behaviors of CH4 decomposition,the reforming of CH4 with CO2 and CO2 gasification reaction were studied. The results indicate that reactant gases conversions are found to be almost unchanged when the particle diameter is below 0.83 mm. And increasing microwave power,enhancing the molar ratio of CO2 and CH4 or reducing the volumetric hourly space velocity result in an increase in the reactant gas conversions. In the reforming reaction,higher conversions of CH4 and CO2 can be obtained at the beginning,and then the CO2 conversion is decreased slightly,together with a sustained decrease in the CH4 conversion. Compared to the reforming reaction,more significant decrease in the CH4 conversion is observed in the CH4 decomposition reaction. The initial CO2 conversion in the gasification reaction is higher than that in the reforming reaction,and then it is lower than that in the reforming reaction after 60 min. The results indicate that biomass char has a good catalytic effect on the reforming of CH4 with CO2 under microwave irradiation.%为了开发一种将生物质热解气中CO2和CH4转化为合成气的方法,该文以生物质焦为催化剂,利用微波加热方式开展了CO2重整CH4试验研究,探讨了粒径、微波功率、CO2与CH4摩尔比及空速对反应气转化率的影响,研究了CH4裂解、CO2重整CH4和CO2气化的反应特性.研究发现,使用粒径为0.83 mm以下的生物质焦催化CO2重整CH4,反应气转化率变化不大.增加微波功率、增大CO2与CH4摩尔比和降低空速均可以提高反应气转化率.重整反应中反应气初始转化率较高,随后CO2转化率降低幅度很小,CH4转化率则一直降低.相比于重整反应,裂解反应中CH4转化率降低幅度更大,气化反应前期CO2转化率高出重整反应,反应60 min后则低于重整反应.结果表明微波场中生物质焦对CO2重整CH4具有较好的催化效果.
展开▼
