Blast furnace hot air branch pipe end hole refractory repairing method

Abstract

The invention relates to a blast furnace hot air branch pipe end hole refractory repairing method. The repairing method comprises the following steps that firstly, a hot air branch pipe end hole refractory damage part is thoroughly cleaned, and the part is blown by compressed air for cleaning; a pouring steel mould is manufactured according to a diameter of the inner wall of a hot air pipeline andfixed through a pouring steel mould fixing bracket; a pouring framework is manufactured and fixed; a pouring sealing plate is welded along a plane or a flange face of a original refractory end hole,and high-strength ceramic material is used for pouring; and curing, demolding and grinding are carried out on the pouring part, and the pouring part is put into use. According to the method, the hot air branch pipe end hole needing to be repaired is repaired through a principle of pouring material indefinite molding; and the pouring framework is welded and fixed to a branch pipe flange and a refractory brick seam to "take root", so that the overall stability of the pouring part is improved. The high-temperature-resistant and extrusion-resistant performance of the pouring material after solidification meets the production environment requirement of the hot air branch pipe, the heat insulation effect of the branch pipe flange is achieved, and the production requirement is met.

Description

technical field [0001] The invention belongs to the technical field of fault treatment of blast furnace hot blast stove equipment, and relates to a method for repairing refractory materials at the ports of blast furnace hot blast branch pipes. Background technique [0002] The lower port of the flange of the hot air branch pipe is usually made of refractory material, which plays a role of heat insulation for the steel shell of the hot air branch pipe and the connecting flange. The refractory material at the hot air branch pipe port is prone to cracking, peeling or even large-scale shedding due to water leakage from the hot air valve and other reasons. During production at a temperature greater than 1100°C and a pressure greater than 300KPa, the temperature at the flange of the hot air branch pipe will exceed the control standard (greater than 250°C), forming a major safety hazard. The traditional repair method after the refractory material is damaged is to use refractory br...

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Problems solved by technology

However, this will reduce the blast furnace air temperature by more than 80-100°C, which will seriously affect the combustion consumption of the blast furnace, increase the cost of molten iron, and even lead to the deterioration of the furnace condition.

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