Laying method of blast-furnace bottom for guiding furnace bottom to be in shape of pot bottom

Abstract

The invention relates to a laying method of a blast-furnace bottom for guiding the furnace bottom to be in the shape of pot bottom. Ceramic bricks are not laid in the center of a furnace bottom ceramic brick layer, a refractory clay pouring material is adopted for pouring, after a blast furnace is put into operation, the refractory clay pouring material in the center of the furnace bottom is gradually eroded by molten iron, and thus the furnace bottom is in the shape of pot bottom. According to the laying method, the ceramic bricks are not laid in the center of the furnace bottom ceramic bricklayer, the refractory clay pouring material is adopted for pouring, the characteristic of poor molten iron erosion resistance of the clay material is used, the pot bottom is gradually eroded and formed after 6-9 months of blast furnace operation, then the whole furnace bottom gradually forms a 'pot bottom' shape, the service life of the first generation of the blast furnace can be effectively prolonged, meanwhile because the clay pouring material is low is price and fast in construction, the investment is saved, and the construction speed is increased.

Description

technical field [0001] The invention relates to a blast furnace construction method, in particular to a blast furnace bottom masonry method for guiding the bottom of the blast furnace into a pot bottom shape. Background technique [0002] In iron and steel enterprises, blast furnace ironmaking costs and energy consumption account for more than 70% of joint enterprises. The main problems of blast furnaces are smooth running and longevity, and longevity is the key to the sustainable development of ironmaking. Since 2003, our country has been greater than 2000m 3 Hearth burn-through accidents occurred in more than 10 large-scale blast furnaces, some of which even occurred in the early stage of furnace service. Hearth burn-through accidents caused great difficulties and huge economic losses to business operations. At present, there are still a large number of large-scale blast furnaces that have potential safety hazards. The blast furnaces are forced to take measures to reduce...

AI Technical Summary

Problems solved by technology

Since 2003, our country has been greater than 2000m 3 Hearth burn-through accidents have occurred in more than 10 large blast furnaces, some of which even occurred in the early stages of furnace operation. Hearth burn-through accidents have caused great difficulties and huge economic losses to business operations

After the damage investigation, it is believed that because the bottom of the furnace has an "inverted pot bottom" or "flat" shape, within the range of 100mm to 200mm from the upper edge of the ceramic pad on the bottom of the furnace, there is always a layer of molten or semi-molten molten iron stored. Since the molten iron in this state has almost no fluidity, the molten iron circulates mainly along the hearth side wall during the tapping process of the blast furnace. Therefore, the erosion of carbon bricks in the range of 200mm from the upper edge of the furnace bottom ceramic pad to 1000mm below the center line of the taphole is aggravated.

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