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Method for jumper connection of cooling stand pipe in medium repair of blast furnace

A riser and jumper technology, which is applied in the field of steelmaking plants, can solve the problems of heavy and tight time, achieve the effect of prolonging the service life, solving the problem of leak detection defects and potential safety hazards, and ensuring stable and smooth operation

Active Publication Date: 2022-08-05
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process requires 15 days to safely shut down the furnace and replace 138 staves.

Method used

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  • Method for jumper connection of cooling stand pipe in medium repair of blast furnace
  • Method for jumper connection of cooling stand pipe in medium repair of blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0064] Before shutting down the furnace, use spray paint to spray the number plates of 46 cooling staves in 6 sections and 40 cooling staves in 10 sections with numbers, so as to facilitate the jumping of pipes and the successful installation of cooling U-shaped connecting hoses. The leather pipe is hoisted to the 10-stage platform with a crane.

[0065] There are 46 cooling risers in East C area, and 23 double-numbered jumpers. Specific operations:

[0066] In the 14th section of the furnace top, turn off all double-number return water valves and open the exhaust valve;

[0067] The soft water closed-circuit circulation system of the single-number temporary connection remains normal, and the jumper connection is completed.

[0068] In the first stage of the furnace base, turn off all double-number water supply valves and open the sewage to drain the water.

[0069] The single-number temporary water closed-circuit circulation system remains normal, and the jumping is complet...

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Abstract

The invention provides a method for jumper connection of a cooling vertical pipe in medium repair of a blast furnace, and relates to the technical field of steel plants. The method comprises the steps that S1, spraying paint is used for spraying codes on cooling walls of the upper section and the lower section of a to-be-repaired section and cooling walls of the upper section and the lower section of an access door; s2, double water supply valves and water return valves on all the cooling walls are closed, exhaust valves are opened, all the double water supply valves are closed, pollution discharge and water emptying are started, and normal circulation is maintained through single valves; s3, jumping connection between the two numbers is started, the originally connected two numbers are disconnected, the cooling wall of the to-be-repaired section is skipped, and connection of the upper section and the lower section of the cooling wall of the to-be-repaired section is completed; s4, a double-number water supply valve and a water return valve are opened, double-number connection works normally, single-number valves are all closed, and the cooling wall is replaced; and S5, the cooling walls of all the sections are sequentially connected with single numbers and then connected with double numbers. According to the method, the cooling wall can be replaced without shutdown, the cooling effect of the water cooling pipe and the cooling wall is guaranteed, and medium repair is completed on schedule.

Description

technical field [0001] The invention relates to the technical field of steelmaking plants, in particular to a method for jumping connection of a cooling riser in a blast furnace. Background technique [0002] The cooling stave soft water closed-circuit circulation joint system of the large blast furnace needs to be shut down for maintenance after many years due to a lot of wear and tear of the cooling stave. Specifically, the 54 furnace bottom water cooling tubes and the hearth cooling wall need to be replaced to ensure the cooling strength, thereby ensuring the smooth circulation of the soft water quality. This process takes 15 days to safely shut down the furnace and replace 138 cooling staves, any heavy and time-critical. The intermediate repair of the blast furnace is mainly the water system, air supply system and coal injection system of the blast furnace body, which need to be replaced at the same time, involving various safety cross operations. SUMMARY OF THE INVEN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B7/10
CPCC21B5/00C21B7/10Y02P10/20
Inventor 熊才年夏建国祝道朋余建伍何国芳陈强张杰余家炎蒋安健
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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