多孔介质回热微燃烧器的扩散燃烧

Diffusion Combustion in a Micro Heat-Recirculating Combustor Using Porous Media

设计了多孔介质回热微燃烧器.进行了微燃烧器的扩散燃烧特性实验研究,得到了其燃烧效率、出口尾气温度、壁面温度和热损失率随燃烧热功率和过量空气系数的变化规律.实验发现,在较宽的操作范围内,微燃烧器具有较高的燃烧效率和出口尾气温度,而且随着燃烧功率和过量空气系数的增大,微燃烧器的壁面温度和热损失率反而减小.分析表明,采用回热夹层和多孔介质相向的进气方式,使得反应气体的流动方向与散热方向相反,有效回收了热量损失,提高了微燃烧器的热效率和出口尾气温度.所设计的多孔介质回热微燃烧器对开发微燃烧透平发电系统具有重要应用价值.

A micro heat-recirculating combustor using porous media plates is designed, and experimental investigation is performed to study its diffusion combustion characteristics, including variations of combustion efficiency, exhaust gas temperature and wall temperature, heat loss ratio with combustion thermal power and excess air ratio. It is shown that higher combustion efficiency and exhaust temperature can be obtained within a wider combustion opera- tion range. Moreover, wall temperature and heat loss ratio decrease with the increase of combustion thermal power and excess air ratio. It is confirmed that by adopting the special structure of regenerative jacket and opposite direction inlet mode of reaction gas through porous media plates, flow direction of reaction gas is opposite to that of heat loss. Hence, heat loss is efficiently recuperated into the micro combustor, and both thermal efficiency and exhaust gas temperature are obviously raised. The micro heat-recirculating combustor has a very important application value in developing the micro gas turbine power generation system.