燃烧状态及煤粉粒径对火焰光谱的影响

THE EFFECT OF FLAME SPECTRUM BY COMBUSTION STATE AND SIZE OF PULVERIZED COAL

本文利用CCD光纤光谱仪,对不同燃烧状态下的煤粉火焰光谱进行测量。发现通过光谱法测得的火焰温度和使用热电偶测得的火焰温度存在一定的偏差。光谱法的温度较热电偶的温度高100-700℃,燃烧条件变差时热电偶的温度下降,光谱法的温度升高,两者偏差增大,光谱法温度的波动范围增加。随着一次风煤粉浓度下降, K的发射谱线强度下降。相同燃烧条件下,煤粉细度提高使得光谱法测得的温度下降,温度波动加剧。

By using a CCD fiber-optic spectroscopy, the temperature of pulverized coal flame in different combustion states was measured with a novel spectrum analysis method. The experiments show that the flame temperature measured by spectrum analysis method and the thermocouple are different. The spectrum temperature is higher 100~700℃than the thermocouple temperature. Once combustion condition being worse, the thermocouple temperature became lower, and the flame spectrum temperature became higher and the temperature fluctuation increase too. The emitted line intensity of K decreases with reducing of the concentration of pulverized coal. The flame spectrum temperature decreased and the range of temperature fluctuation increased, when the size of pulverized coal became smaller.