摘要
为研究不同催化壁面对燃烧的影响,采用甲烷和空气预混催化燃烧方式,运用连续介质层流有限速率模型和二阶离散方法对微型燃烧腔内不同催化壁面对甲烷催化燃烧的影响进行了三维数值模拟。结果表明,壁面温度、甲烷与氧气摩尔比和甲烷质量流量变化时,下催化壁面对甲烷催化燃烧效率影响最大,侧面次之,上催化壁面最小。下催化壁面单位面积催化燃烧效率约是上催化壁面的3倍,其催化剂利用率也最高。涂敷催化剂时,下底面应适当多涂,侧面适量,上底面尽量少涂。得到了不同催化壁面对甲烷催化燃烧的影响规律和贡献率,提出了涂覆催化剂的优化策略,降低催化燃烧成本。
In order to study the effects of different catalytic walls on combustion characteristics, the premixed catalytic combustion characteristics of methane/air in micro-combustor are studied. It lays the foundation for the combustion technology of hydrocarbon-fuel in micro-engine. Numerical simulation of flow and catalytic combustion in micro-combustor was done by using laminar finite-rate and second-order upwind discretization methods. The results show that when wall temperature, CH4/O2 mole ratio and methane mass flow rate change, the influence of lower catalytic wall on the methane catalytic combustion efficiency is biggest, followed by side catalytic wall, the smallest is upper catalytic wall. The methane catalytic combustion efficiency unit area of lower catalytic wall is about three times of that of upper catalytic wall. The utilization of catalyst on lower catalytic wall is maximal . Therefore, when coating catalyst, the quantity of katalyst on lower catalytic wall should be appropriate more, moderate on the side catalytic wall, as little as possible on the upper catalytic wall. The influence disciplinarian and contribution rate of different catalytic wall on methane combustion have been gained. The optimized strategy of catalyst coating was put forward and reduced the cost of catalytic combustion.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第10期1159-1164,共6页
Journal of Chongqing University
基金
国家自然科学基金资助项目(50906103
20876118)
关键词
微型燃烧器
甲烷
燃烧
催化壁面
数值模拟
micro-combustor
methane
combustion
catalytic wall
computer simulation
