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直吹管是高炉送风系统中一个不可缺少的热工部件,最早采用铸铁或低碳钢制作。这种材质的吹管在高温热风的作用下易变形,甚至烧穿损坏,限制了入炉风温的提高;同时由于金属导热率高,当热风流过时通过辐射和对流传热向外界散失大量热能,造成风温下降。自五十年代初以来,相继采用耐火混凝土浇捣内衬的吹管,适应了当时高风温操作的要求,但是单层内衬保温效果较差。为了有效地解决直吹管散热问题,减少热风温度损失,以达到降低焦比、提高产量的目的,我们于1983年设计了一种双层内衬保温直吹管,并对所用耐火、保温材料
Direct blowing pipe blast furnace air supply system is an indispensable thermal components, the earliest use of cast iron or low carbon steel production. The material of the blow pipe under the action of hot air is easy to deform, and even burn through damage, limiting the furnace temperature increase; the same time as the metal thermal conductivity is high, when the hot air through the radiation and convection heat to the outside world to lose a lot of heat , Causing the temperature drop. Since the early 1950s, the blowpipes with refractory concrete pouring and pounding have been used one by one to meet the requirements of high-temperature operation at that time, but the effect of single-layer lining is poor. In order to effectively solve the problem of direct blow pipe cooling and reduce the hot air temperature loss, in order to reduce the coke ratio and increase the output, we designed a double-layer insulated straight blow pipe in 1983, and used the refractory and insulation materials