煤粉燃烧颗粒粒子云辐射特性的研究

分析了在560nm的测量波长处煤粉炉中炭粒和飞灰粒子云的辐射特性。利用Mie理论,分别计算了燃烧器出口和炉膛的上部颗粒粒子云的辐射特性,发现在燃烧器出口区,炭粒对颗粒总体辐射减弱系数的影响较大,占90%以上;而在炉膛的上部,飞灰的影响较大。从数值计算结果中可以看出,飞灰粒子云的散射率高达91.6%,其对辐射的散射作用比吸收更强,而炭粒子的散射率仅为50%。

Numerical Simulation on the Radiative Characteristics of the Particles in the Pulverized Coal Furnace

The radiative characteristics of char and ash in the pulverized coal furnace at the wavelength of 560 nm are analyzed here.The particles’radiative coefficients are calculated in the exit of the burner and in the upper part of the furnace separately according to the Mie theory.It can be inferred that in the exit of the burner,char has a great effect on the particles’radiative co-efficient,which accounts for a percentage of 90%.While in the upper of the furnace,ash dominates the particles’radiative coef-ficient.The scattering ratio of the ash is calculated to be 91.6 and the scattering ratio of the char is only 50%.