预混天然气在多孔介质燃烧器中的燃烧与传热

在一台小型渐变型多孔介质燃烧器上进行了预混天然气燃烧与传热试验研究，探讨了天然气速度和多孔介质厚度对多孔介质燃烧室的温度分布、排烟温度和流动阻力的影响。结果表明，天然气在渐变型多孔介质燃烧器中燃烧稳定，燃烧室与水冷夹套间的换热受天然气速度和多孔介质厚度影响，换热效果比空管中燃烧明显增强，同时预混天然气通过多孔介质的进出口压差随着天然气速度和多孔介质厚度的增加而增加。

Combustion and heat transfer of premixed natural gas in a porous media burner

The experiments on the premixed natural gas combustion and heat transfer were conducted in a bench-scale porous media burner. The porous media used is a kind of gradually-varied porous media. It is found that the premixed natural gas can burn steadily in the burner, and gas velocity and porous media thickness have influences on the temperature profile, exit gas temperature and pressure drop. Heat transfer coefficient between the flame and water in the jacket was measured. Experimental results show that the heat transfer is enhanced in the gradually-varied porous media, comparing to the free flame combustion. Meanwhile, a pressure drop along the burner increases as the gas velocity and porous media thickness increase.