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在二维流动模型中进行的试验表明,倒V形软熔带对高炉内的透气性来说是最佳的。在喷吹煤粉时,也就是要节省焦炭时,焦炭层厚度应当保持在一定范围内,以便将透气性恶劣的多种颗粒炉料层限制得最薄。通过提高软熔带峰顶位置,可以-增加焦炭窗口数,从而减小这个范围内的透气阻力。燃烧试验表明,喷吹煤粉的最大数量与喷吹煤的种类和粒度有关。试验中没有找到最佳的喷吹煤粉粒度值。超过最大喷吹量时引起燃烧率曲线陡降,同时也会因为炉内未燃烧的煤粉积存而导致透气性变差,炉身下部空隙容积减小而引起炉况失常。为了不致影响高炉的透气性,煤粉必须在循环区内完全燃烧。
Experiments conducted in a two-dimensional flow model show that the inverted V-shaped reflow ribbon is optimal for air permeability within the blast furnace. When blowing pulverized coal, that is, to save coke, the thickness of the coke layer should be kept within a certain range in order to limit the most gas-permeable multiple particle charge layers to the thinnest. By increasing the peak position of the reflow ribbon, you can - increase the number of coke windows, thereby reducing the resistance to breathe within this range. Burning tests show that the maximum amount of pulverized coal injection is related to the type and particle size of PCI coal. No optimal pulverized coal particle size was found during the test. Exceeding the maximum injection rate causes a sharp drop in the combustion rate curve, but also because of unburned coal stored in the furnace resulting in deterioration of air permeability, reducing the volume of the lower part of the body of the furnace caused by abnormal furnace conditions. In order not to affect the breathability of the blast furnace, the pulverized coal must be completely burned in the recirculation zone.