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高炉富氧喷煤是增产节焦的有效途径,实现超量喷吹煤粉,关键是煤粉的燃烧问题。本文针对富氧喷煤并用循环炉顶煤气来控制理论燃烧温度的炼铁工艺,建立了适用于高炉直吹管风口区的煤粉燃烧气化数学模型,经实验室模拟燃烧实验证明,该模型基本上是合理的。用数学模型对不同操作条件下的煤粉燃烧过程作了模拟计算,并以实验考察了喷吹方式对燃烧过程的影响。结果表明:用循环炉顶煤气来控制理论燃烧温度,能满足高炉冶炼的要求;增加喷煤量,将使煤粉燃烧率下降,进入回旋区内未燃尽煤粉量急剧增多,要实现超量喷吹煤粉,应选用燃烧性能好的烟煤作为喷吹用煤,适当降低煤粉的粒度,选择适宜的喷吹角度。
Oxygen-rich pulverized coal injection blast furnace is an effective way to increase the production of coke, to achieve excessive injection of pulverized coal, the key is the combustion of coal. In this paper, a mathematical model of pulverized coal combustion and gasification suitable for direct blowing tuyere area of blast furnace is established for oxygen-rich coal injection and the process of ironmaking with circulating top gas to control the theoretical combustion temperature. The laboratory simulation combustion experiment proves that the basic model It is reasonable. The mathematical model was used to simulate the combustion process of pulverized coal under different operating conditions. The effect of injection mode on the combustion process was experimentally investigated. The results show that using circulating top gas to control the theoretical combustion temperature can meet the requirements of blast furnace smelting. Increasing the amount of coal injected will reduce the combustion rate of pulverized coal and increase the amount of unburnt coal powder into the raceway. The amount of pulverized coal injection, should use a good burning performance of bituminous coal as blowing coal, appropriate to reduce the particle size of coal, select the appropriate angle of injection.