Maintenance method of blast furnace main channel

Abstract

The invention discloses a maintenance method of a blast furnace main channel. The maintenance method comprises the following steps of replacing an old steel tank with a new steel tank, respectively arranging a refractory brick layer and a heat insulation layer at the bottom and the side surface of the new steel tank, and sequentially arranging a bottom permanent layer and a prefabricated part layer on the refractory brick layer, wherein a hole for arranging a thermocouple is reserved on the surface, close to a heat insulation layer, of each prefabricated part in the prefabricated part layer, and the thermocouple penetrates through the heat insulation layer through shells at two sides of the steel tank and is inserted into the hole of the prefabricated part; and then, hanging a mold above the bottom permanent layer and the prefabricated part, and pouring refractory materials among the permanent layer, the prefabricated part layer and the mold to form a working layer. According to the maintenance method of the blast furnace main channel, the working layer of the main channel covers the large-volume and firm prefabricated part, so that the structure is stable. Even if the prefabricated part is damaged, a certain damaged prefabricated part can be lifted out for replacement, and the process is simple. Meanwhile, the thermocouple is additionally arranged, so that an operator can judge the working condition of the working layer of the corresponding area in real time, an accurate maintenance scheme is provided, the maintenance period is prolonged, and the service life of the main channel is prolonged.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting, and in particular relates to a method for maintaining a main ditch of a blast furnace. Background technique [0002] The large-scale blast furnace has four tapholes, which are evenly distributed around the blast furnace. Under normal conditions, the working method of the taphole is: open one of the No. Carry out plugging; after about 10-30 minutes, open the counter iron hole of the number of iron holes to tap iron. During the tapping of the two opposite iron ports in this way, the main grooves corresponding to the two adjacent iron ports are in the maintenance state. After about 45 days, switch to the two adjacent iron gates to tap iron in turn, and maintain the main ditch corresponding to the two opposite iron gates during this period. [0003] The main ditch is an important part of the blast furnace slag and iron treatment system. It not only serves as the primary channel for s...

AI Technical Summary

Problems solved by technology

[0008] 5) During the maintenance of the main ditch, when cleaning the slag remaining in the main ditch, the main ditch will be physically damaged

[0009] Because the main ditch is exposed to high temperature, thermal stress, mechanical erosion, chemical erosion and physical damage for a long time, memory loss and structural damage will inevitably occur. Although all iron works have taken corresponding measures, there are still major safety hazards

For example, during the overhaul of a domestic steel factory, it was found that the steel shell of the main ditch of one field was completely broken, and similar cracks appeared in the main ditch of other fields. If production continued, molten iron would leak and cause major production accidents.

Therefore the main ditch needs regular maintenance and replacement

Images