高温低氧气氛下煤粉颗粒燃烧特性实验

Experimental research on combustion characteristics of pulverized coal particles in high temperature and low oxygen content environments

在平面扩散火焰煤粉燃烧实验台上,采用光纤光谱仪测量了煤粉颗粒燃烧辐射光谱,根据普朗克定律和双色法研究了不同热氛围(热协流)温度(1 400~1 800 K)和氧体积分数(5%~20%)下煤粉燃烧的颗粒温度和发射率变化规律。实验结果表明:平面扩散火焰燃烧器可以为煤粉颗粒燃烧提供一维稳定且均匀的热氛围;当热氛围氧体积分数从5%增加到20%,煤粉颗粒平均温度增加了约270 K;相同氧体积分数下,当热氛围温度从1 400 K提高到1 800 K,煤粉燃烧的颗粒平均温度增加了460 K左右,着火距离缩短,火焰亮度提高。

On the flat diffusion flame pulverized coal combustion test bench,the radiation spectrums of pulverized coal combustion were measured by the fiber optic spectrometer.Based on the Planck’s law and two-color method,the change laws of the coal particle temperature and emissivity of pulverized coal combustion were studied at different hot coflow temperatures(1 400~1 800 K)and oxygen volume fractions(5%~20%).The experimental results show that,the flat diffusion flame burner can provide a stable and uniform hot coflow for the combustion of pulverized coal particles.As oxygen volume fraction in the hot coflow increases from 5%to 20%,the temperature of pulverized coal particle increases,and the average particle temperature increases by about 270 K.At the same oxygen volume fraction,when the hot coflow temperature increases from 1 400 K to 1 800 K,the average particle temperature of pulverized coal combustion increases by about 460 K,the ignition distance is shortened,and the flame brightness increases.