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通过建立数学模型,在Fluent软件的基础上结合自编程序,对不同预热温度下高炉喷吹煤粉的燃烧进行了模拟,得到了预热温度对煤粉燃烧的影响规律.模型中包含了煤粉与O2,CO2及水蒸汽的异相反应,且考虑了焦炭的燃烧反应.确定了回旋区的大小与形状,将煤粉燃烧空间划分为4个区域,对不同区域分别提出不同假设进行处理.计算结果表明,煤粉预热后进行喷吹可促进煤粉在风口前提前气化,使煤粉的燃烧区域前移,提高了煤粉在回旋区的燃尽率;预热温度每提高50℃,煤粉在回旋区的燃尽率平均提高2%.
Through the establishment of mathematical model and the combination of Fluent software and self programming, the combustion of pulverized coal injection at different preheating temperatures was simulated and the influence of preheating temperature on pulverized coal combustion was obtained.The model contains Coal and O2, CO2 and water vapor heterogeneous reaction, and taking into account the combustion reaction of coke to determine the size and shape of the convolution area, the combustion of coal combustion is divided into four regions, different regions were put forward different assumptions The results show that the pulverized coal injection after preheating can promote the pulverized coal to gasify before the tuyere and make the combustion area of pulverized coal move forward and increase the burnout rate of pulverized coal in the convolution zone. Increase 50 ℃, pulverized coal pulverizer burn rate increased by 2% on average.