内置多孔介质卷式反应器内甲烷富燃制氢的数值模拟

Numerical simulation of hydrogen production from rich combustion of methane in built-in porous media Swiss-roll reactor

为了解甲烷在内置多孔介质卷式反应器内超绝热富燃制氢特性,采用计算流体力学与详细的化学反应机理相结合的方法,对甲烷在该反应器的富燃制氢过程进行了数值模拟,研究当量比和预混气体流速对燃烧区峰值温度、合成气组分和甲烷转化效率的影响,并和实验值进行对比。结果表明,多孔介质内甲烷的燃烧温度远超过其绝热火焰温度,实现了超绝热条件下富燃制氢;在研究范围内,甲烷-氢气的转化效率随当量比和气体流速的增大而增大,数值模拟结果与实验值基本吻合。

To understand the working features of hydrogen production from methane super-adiabatic combustion in the built-in porous media Swiss-roll reactor,the computational fluid dynamics and detailed chemical reaction mechanism GRI1.2 were combined to simulate the reaction process of hydrogen production in the reactor.The effects of equivalence ratio and premixed gas velocity on the maximum temperature of burning zone,the components of synthesis gas and methane conversion efficiency were studied and compared with the experimental results.The results show that CH4 combustion temperature inside the porous media is much higher than the adiabatic combustion temperature,and the hydrogen production on the condition of superadiabatic combustion is realized.Within the scope of this research,methane-hydrogen conversion efficiency increase with the increase of equivalence ratio and premixed gas velocity.Numerical results agree well with the experimental results.