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高炉直吹管内煤粉燃烧是在有限空间内进行的,煤粉的燃烧受到限制。为了促进直吹管内煤粉的燃烧,通过二维模型研究了不同的煤粉性能和高炉操作条件对双枪喷煤时直吹管内煤粉燃烧率的影响。结果表明。煤粉的粒度越小,煤粉的燃烬率越高;煤粉的挥发分质量分数越高、热风的氧气质量分数越高,煤粉的燃烬率也越高。较高的热风温度有利于煤粉的燃烧.但当热风温度提高到1 200℃以上时,继续提高热风温度对煤粉燃烬率的影响较小。此外,还对直吹管内挥发分、温度以及各种气体成分的分布情况进行了对比分析,以便更好地理解上述操作条件对煤粉燃烧的影响。
Pulverized coal blast furnace blast furnace combustion is carried out in a limited space, the combustion of pulverized coal is limited. In order to promote the combustion of pulverized coal in the straight blow pipe, the effects of different pulverized coal properties and operating conditions of blast furnace on the combustion rate of pulverized coal in straight blowpipe were studied by two-dimensional model. The results show. The smaller the particle size of pulverized coal is, the higher the burning rate of pulverized coal is. The higher the volatilization mass fraction of pulverized coal is, the higher the oxygen mass fraction of hot air is and the higher the burning rate of pulverized coal is. Higher hot air temperature is beneficial to the combustion of pulverized coal, but when the temperature of the hot air is increased above 1200 ℃, the effect of hot air temperature on the burning rate of pulverized coal is small. In addition, the volatile components, the temperature and the distribution of various gas components in the blowpipe were also compared and analyzed in order to better understand the impact of the above operating conditions on the combustion of pulverized coal.