甲烷微尺度催化燃烧的数值模拟

NUMERICAL SIMULATION OF CATALYTIC COMBUSTION OF CH_4 IN MICRO-SCALE

本文联合使用计算流体力学软件FLUENT和可以计算表面反应的化学反应动力学软件DETCHEM对有逆流换热的微尺度燃烧器进行了数值计算。计算中忽略空间反应。燃料-空气混合物的当量比为0.4,反应器壁面采用等温边界条件。计算结果表明,采用催化燃烧可以实现微尺度下通常情况下无法实现的甲烷稳定燃烧。通过适当设置催化表面,可以实现燃料低温、高效转变。甲烷的总转变率受流动状态、反应温度和催化表面的大小等因素的影响。

In this paper was preformed numerical simulation for micro-scale combustor with coun-terflow heat exchanger using both CFD FLUENT and surface chemistry subroutine DETCHEM. The gas phase reactions were neglected in calculations. Stoichiometric ratio of fuel-air mixture is 0.4. Constant wall temperature has adopted as a boundary condition. Results indicate that stable methane micro-scale combustion can be realized under catalytic combustion. Hydrocarbons can convert in high efficiency at low temperature on Pt catalyst surface. Flow conditions, reaction temperature and catalyst surface have influence on total conversion of methane.