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布料模式决定了炉料的空隙度,而炉料的空隙度分布决定了煤气流的第2次分布。采用三维竖炉数学模型,考察了单环布料情况下,挡位分别在竖炉炉顶直径的0.0、0.8、1.6、2.0、2.4、2.8m时竖炉内煤气压差和煤气流的变化情况。结果表明:布料过程在料面上发生的炉料粒度偏析对煤气流分布的影响很大,料堆尖处煤气流速很低。随着布料档位外移,竖炉整体压差和围管压差呈现增加的趋势,而反窜煤气比例呈现先微弱降低后迅速增加的趋势,拐点出现在2.0m布料档位。竖炉炉料布料方式对煤气流有再分配的作用,较为适宜的布料档位为1.6m,不宜超过2.0m。
The cloth pattern determines the porosity of the charge, and the void fraction distribution of the charge determines the second distribution of the gas flow. The mathematical model of three-dimensional shaft furnace was used to investigate the variation of gas pressure and gas flow in the shaft furnace when the gear positions were 0.0, 0.8, 1.6, 2.0, 2.4 and 2.8 m . The results show that the particle size segregation on the material surface affects the distribution of gas flow greatly and the gas velocity at the tip of the material pile is very low. With the shift of the fabric stalls, the overall pressure of the shaft furnace and the pressure drop around the tube show an increasing trend, while the proportion of the anti-blow-through gas shows a trend of first increasing rapidly after slightly weakening. The inflection point appears in the 2.0m cloth gear. Shaft furnace charge material distribution has the effect of redistribution of gas flow, the more appropriate cloth gear is 1.6m, not more than 2.0m.