甲烷入口条件对紧凑型重整器燃烧管道化学反应与产热特性影响

Effects of Methane Inlet Conditions on Chemical Reactions and Heat Production in a Combustion Duct of Compact Methane Reformer

紧凑型甲烷重整器燃烧管道由燃料气体通道、多孔层以及固体平板组成。采用三维数值模拟方法,对甲烷入口速度、温度等对催化燃烧反应以及产热特性影响进行了研究。结果显示,甲烷入口速度由2.5 m/s增大到10 m/s时,最大化学反应速率提高了20.4%,CH4利用率下降了41.2%,最大热流量提高了11.8%;温度由873 K升高到1023 K时,反应速率提高了16.9倍;CH4利用率提高了7.5%;最大温升提高了2.1倍。研究结果对紧凑型甲烷重整器的设计开发具有一定的指导意义。

A composite combustion duct in compact methane reformers consists of a gas flow channel,porous layer and solid plates.By three dimensional CFD approach,the effects of methane inlet conditions such as velocity and temperature on chemical reactions and heat production were studied.It is revealed that by increasing inlet velocity from 2.5 to 10 m/s,the maximum reaction rate and heat flux increased 20.4%and 11.8%,respectively.In addition,the CH_4 utilization reduced 41.2%.It is also found that by increasing inlet temperature from 873 K to 1023 K,the maximum reaction rate and the CH_4 utilization increased 1690%and 7.5%,respectively.At the same time,the 2.1 times maximum temperature raise was observed.The results are of some significance on designing and developing compact methane reformers.