平面火焰微燃烧器及其温差热电转换系统

Plat-Flame Micro Combustor and Its Application in Thermoelectric Power Generation System

提出了一种厘米级别的平面火焰微燃烧器及其温差热电转换系统原理,即燃料氧化剂混合气相向穿过两块平行布置烧结多孔平板并在其表面形成稳定的火焰,实现燃烧器壁面温度远低于火焰温度的目的;进行燃烧器和微发电系统原型性能实验.在燃烧器烟气通道外壁面布置高导热系数薄匀热片能够有效改善热电模块热端温度场均匀性,从而提高系统安全性和输出性能.在燃烧燃料当量比(甲烷/空气)φ=0.6时,火焰温度高于800℃,壁面温度低于200℃,水冷条件下,商用碲化铋(Bi2Te3)热电模块热端150℃,系统可以获得8 V开路电压和1 W以上稳定输出功率,系统综合效率达1.6%.

A centimeter magnitude plat-flame micro combustor,which burns hydrocarbon mixture and provides heat source for thermoelectric（TE）power generation system,has been developed the performance of the micro combustor and the TE power generation system have been tested.The working principle of the plat-flame micro combustor is that two porous parallel plate chamber walls act as mixture inlets,and a plat-flame can form on the surface of porous chamber wall,so the temperature of combustor wall is much lower than flame temperature.A thin high heat conduction coefficient brass slice is set between the outside wall of exhaust gas channel and the hot side of TE module,and it has uniformed the hot side temperature field of TE modules and improved the performance of TE power generation system.When burning CH4/air mixture at equivalence ratio φ=0.6,the flame temperature is above 800 ℃,and the combustor’s wall temperature is lower than 200 ℃;cooled by water,the hot side temperature of commercial Bi2Te3 TE module is 150 ℃,the system generates 8 V open circuit volt and above 1 W output power,and the overall system efficiency is 1.6%.