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根据相似原理,对高炉滴落带初渣流动进行了区域模拟的实验研究。结果表明:在现代高炉操作条件下,初渣偏流现象是不可避免的;初渣在滴落带横截面上呈二次项分布。在正常操作条件下,铁液的滴落几乎不受横向气流的作用,因而,生铁一经生成便与初渣分离而垂直下滴,而初渣则主要集中在软熔带内边缘附近区域流动。初渣偏流影响到焦窗的透气性。提高焦炭强度,保证滴落带焦炭柱中大于20mm 的大顺粒组成高于80%,或对小颗粒焦炭进行分级整粒入炉,将减轻滴落带初渣偏流,改善高炉下部的透气性和透液性。
According to the similar principle, the experiment of regional simulation on the initial slag flow in blast furnace drip zone was carried out. The results show that the drift of primary slag is unavoidable under the operation conditions of modern blast furnace. The primary slag is quadratic term in the cross section of the dripping strip. Under normal operating conditions, the dripping of the molten iron is hardly affected by the transverse airflow. Therefore, once the pig iron is separated from the primary slag, it drips vertically while the primary slag flows mainly in the vicinity of the inner edge of the reflow band. Primer drift affects the coke window ventilation. Improve the coke strength, to ensure drip with coke column greater than 20mm large cis-grain composition of more than 80%, or small particles of coke grading into the furnace, will reduce the drip with the initial slag bias current to improve the lower part of the blast furnace gas permeability And liquid permeability.