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On-line changing method of hot blast main duct of blast furnace

A technology of hot air main pipe and replacement method, applied in blast furnace, blast furnace details, blast furnace parts and other directions, can solve problems such as refractory brick damage, large owner loss, shell deformation, etc., saving construction period and cost, small production impact, and low cost Effect

Active Publication Date: 2010-12-01
MCC5 GROUP CORP SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long-term hot blast main pipe under high-temperature working conditions, the hot blast main pipe is easily damaged locally, which is manifested in severe deformation of the outer shell and damage to the internal refractory bricks
During maintenance, due to the high-altitude operation, there are great safety hazards; and the poisonous gas is seriously harmful, and it has not been able to be partially dismantled and repaired online. The current traditional method is to stop production of all hot blast stoves, and replace the entire hot blast main pipe after dismantling
In this way, production is affected, and the owner loses a lot

Method used

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  • On-line changing method of hot blast main duct of blast furnace
  • On-line changing method of hot blast main duct of blast furnace
  • On-line changing method of hot blast main duct of blast furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Such as figure 1 As shown, the hot blast stove 11, the hot blast stove 12, the hot blast stove 13 and the hot blast stove 14 are respectively connected on the hot blast main pipe 31 by the hot blast valve 21, the hot blast valve 22, the hot blast valve 23 and the hot blast valve 24. The section 311 of the hot blast main pipe needs to be replaced, and an expansion joint 41 is installed on both sides of the section 311 of the hot blast main pipe to be removed. The online replacement method of the hot blast main pipe of the blast furnace is adopted. After the hot blast stove is shut down and the energy medium pipelines are closed, follow the steps below: Remove the hot air main pipe → seal the pipe openings at both ends of the unremoved section → build the tee part of the hot air main pipe on the ground → hoist the hot air main pipe → build the hot air main pipe online → remove the heat insulation sealing wall, the specific steps are:

[0023] When dismantling the hot blas...

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Abstract

The invention relates to an on-line changing method of a hot blast main duct of a blast furnace, belonging to the field of construction of a pipeline system used for gas distribution in a brick-built hot blast furnace. The on-line changing method of the hot blast main duct of the blast furnace sequentially comprises the following steps after the hot blast furnace stops producing and each energy medium pipeline is closed: disassembling the hot blast main duct; plugging pipeline openings positioned on both ends of a section which is not disassembled; building the three-way part of the hot blast main duct on the ground; lifting the hot blast main duct; building the hot blast main duct on line; and disassembling a heat-insulation plugging wall. The invention has short construction period, low cost and little influence on production.

Description

technical field [0001] The invention relates to the field of pipeline system construction for gas distribution in brick hot blast stoves, in particular to an online replacement method for a blast furnace hot blast main pipe. Background technique [0002] The hot blast pipe is a pipe used to send the hot blast flowing from the hot blast stove into the blast furnace through the hot blast main pipe, the hot blast surrounding pipe, and the air supply branch pipe. The blast furnace hot blast main pipe is the main gas passage connecting the blast furnace and the hot blast stove. The material is steel pipe, and the inner lining is made of refractory material for heat insulation. The three-way port is connected to the hot blast valve at the outlet of the hot blast branch pipe of the hot blast stove. Connect the two ends of a section of the main pipe of each hot blast stove on the hot blast main pipe to connect the expansion joints. Due to the long-term hot blast main pipe under hi...

Claims

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Application Information

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IPC IPC(8): C21B9/10
Inventor 任社安郭晓宇谭春华冉丛辉
Owner MCC5 GROUP CORP SHANGHAI
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