Large blast furnace body gas leakage prevention method

Abstract

The invention discloses a large blast furnace body gas leakage prevention method. According to the method, the blast furnace gas leakage is processed; the lower furnace body gas is processed according to the following case: the furnace foundation cooling-free zone and first to third cooling surface zones are respectively provided with holes, a plastic sealed grouting material with a retarding agent is pressed into the holes of the furnace foundation cooling-free zone, and a plastic sealing material is pressed into the holes of the first to third cooling surface zones, wherein the pressing pressure is gradually reduced to 2MPa from 12-16MPa. By comprehensively applying the method of the invention, the furnace foundation gas leakage is effectively controlled, so the blast furnace life is greatly prolonged, and the blast furnace can continuously and normally smelt.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a method for preventing gas leakage from a large blast furnace body. Background technique [0002] During the normal production of large blast furnaces, due to the high pressure in the furnace and the high smelting intensity, the amount of gas produced is also large. The hearth and bottom of the furnace have adopted relatively good gas sealing methods to prevent gas leakage. However, after two to three years of production in most large-scale blast furnaces, the following defects and problems have appeared under the condition of relatively high smelting intensity: cracks in the joints of the furnace base sealing plate; There is a large amount of gas leakage between the sleeves; the temperature of the furnace bottom and the side wall of the furnace hearth increases; the corrosion of the furnace bottom, furnace hearth and inner lining refractory material...

AI Technical Summary

Problems solved by technology

However, after two to three years of production in most large-scale blast furnaces, the following defects and problems have appeared under the condition of relatively high smelting intensity: cracks in the joints of the furnace base sealing plate; There is a large amount of gas leakage between the sleeves; the temperature of the furnace bottom and the side wall of the furnace hearth increases; the corrosion of the furnace bottom, furnace hearth and inner lining refractory material is intensified, and the life of the blast furnace is shortened; the blast furnace is operated under reduced pressure, and the output is greatly reduced; , hearth, cooling water temperature difference decreases, the cooling effect becomes worse

However, the gas concentration around the blast furnace exceeds 400ppm, r