流化床反应器中CO_(2)甲烷化过程实验研究

Experimental Study on CO_(2) Methanation Reaction in Fluidized Bed Reactor

设计制造一套千瓦级容量甲烷化流化床反应装置,进行甲烷化流化床反应器运行特性实验研究。综合考察温度、空速、压力对甲烷化反应转化特性的影响,并在此基础上对电转气工艺设计思路进行探讨和分析。结果表明:随着温度的升高,CO_(2)转化率先逐渐上升再下降,因此在单级流化床反应器内难以兼顾反应转化效率和副产蒸汽品质;甲烷化反应速率快,空速增大时CO_(2)转化率只有小幅降低,因此采用大空速可节省催化剂用量,但可能会带来颗粒破碎隐患;压力增大可有效提高CO_(2)转化率,但会提高电转气工艺投资成本,应采用分离设备或水汽冷凝脱除设备,低压下实现高转化率。

A fluidized bed methanation reactor with kilowatts capacity was built, and then the performance of the reactor was comprehensively investigated. The effect of temperature, space velocity and pressure on the methanation reaction was studied. And the design idea of the power-to-gas technology was analyzed. The results showed that,CO_(2) conversion first gradually increased and then decreased with increasing the temperature. So it is difficult to satisfy both high CO_(2) conversion and high-grade steam in a single methanation reactor. CO_(2) conversion reduced slightly with increasing of the space velocity because the rate of the methanation reaction was very fast. Therefore, the amount of catalyst can be reduced when high space velocity is applied, but it may bring about particle breakage. CO_(2) conversion was effectively improved with increasing of the operating pressure. But the investment of the power-to-gas technology would be very high in case of the high pressure. And then the separation equipment or water removal equipment should be used to achieve a high conversion under low pressure.