Blast furnace cooling wall maintenance method

Abstract

The invention discloses a blast furnace cooling wall maintenance method. The method comprises the following steps that a series pipeline with water leakage is determined; holes are drilled in a water inlet main pipe and a water outlet main pipe of the series pipeline, N water inlet holes and M water outlet holes are obtained, the hole diameter of the water inlet holes is the same as that of the water outlet holes, M-N is equal to 1 or M-N is equal to 2, water inlet valves are installed on the water inlet holes, and water outlet valves are installed on the water outlet holes; the water outlet valves are opened, a water outlet main valve of the series pipeline is closed, soft water is made to flow out of the water outlet valves, and the water inlet valves are connected with cooling water; and a water inlet main valve of the series pipeline is gradually closed while the water inlet valves are gradually opened, so that the cooling water replaces soft water to cool a cooling wall. According to the blast furnace cooling wall maintenance method, on the premise that the cooling effect is guaranteed, cooling water with small flow is used for cooling the cooling wall, the water leakage amount is reduced, meanwhile, the pipeline is prevented from being further damaged, and a soft water circulation system is prevented from being polluted.

Description

technical field [0001] The invention relates to the technical field of blast furnace cooling, in particular to a method for maintaining a cooling wall of a blast furnace. Background technique [0002] The service life of the blast furnace depends on the service life of the stave. When the blast furnace enters the later stage of production and service, the stave in the high temperature zone will be damaged to varying degrees, resulting in water leakage in the stave. For blast furnaces that adopt soft water closed-circuit circulation cooling, because the copper staves in the high-temperature zone are cooled in series from bottom to top, it is difficult to confirm the specific leaking staves when the blast furnace leaks, and because the blast furnace adopts a customized repair system, from an economic point of view, The blast furnace cannot be shut down to replace the cooling wall at any time, so the maintenance work after the cooling wall leaks is particularly important. Afte...

AI Technical Summary

Problems solved by technology

After the cooling wall leaks, the gas enters into the cooling wall, and a large amount of impurities in the gas enters the soft water circulation system, which pollutes the water in the entire circulating cooling system. If it is not treated in time, it will cause scale formation on the cooling wall and reduce the cooling effect of the blast furnace. The stave is further damaged due to the reduction of the cooling effect, thereby reducing the service life of the stave

The soft water closed-circuit cooling system is a closed system with high internal pressure. Once the cooling wall is damaged, water leakage will accelerate into the blast furnace through the damaged part, causing the furnace temperature to drop, and the blast furnace air flow changes to affect the normal production of the blast furnace.

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