Off-line stove cooling method for hot-blast stove

A hot blast stove and cool stove technology, applied in the field of hot blast stove maintenance, can solve problems such as broken or collapsed vault refractory bricks

Active Publication Date: 2020-09-15
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the cooling control is not good, it may even lead to vicious accidents such as breakage or collapse of refractory bricks in vaults and other parts.

Method used

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  • Off-line stove cooling method for hot-blast stove
  • Off-line stove cooling method for hot-blast stove

Examples

Experimental program
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Effect test

Embodiment 1

[0082] The off-line cooling method of the hot blast stove of this application is in Baowu Group Shaoguan Iron and Steel 3200m 3 Applied to blast furnace internal combustion silica brick hot blast stove.

[0083] Install a K-type thermocouple in the original radiation thermometer installation hole on the side of the hot blast stove vault. The diameters of the first manhole and the second manhole are both 700mm. The diameter of the main pipeline is 900mm, equipped with an electric butterfly valve, the diameter of the branch pipeline is 700mm, the second pipeline is laid at the second manhole, and the adjusting flap is equipped, the diameter of the second pipeline is 700mm.

[0084] First cool down to 700°C at a cooling rate of 6-8°C / h, and keep warm at 700°C for 24 hours, then cool down to 300°C at a cooling rate of 2-3°C / h, and keep warm at 300°C for 24 hours, and finally use Cool down to 60°C at a cooling rate of 1-2°C / h. The entire process of cooling the stove is completed ...

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PUM

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Abstract

The invention provides an off-line stove cooling method for a hot-blast stove, and relates to the technical field of hot-blast stove maintenance. The off-line stove cooling method for the hot-blast stove comprises the steps: a K-type thermocouple is arranged on the arch apex side of the hot-blast stove, and a first pipeline is laid between a first manhole and a standby combustion fan; a gas inlet,an oxidant gas inlet and a waste gas discharge outlet of the hot-blast stove are closed, and a combustor of the hot-blast stove is stopped; cool air is blown to the hot-blast stove through the firstpipeline, and after the cool air is subjected to heat exchanging in the hot-blast stove, generated hot air is discharged from a second manhole; and taking the temperature of the K-type thermocouple asthe main basis and the temperature of a B-type thermocouple as the reference, by adjusting the air inlet speed of the cool air and the discharging speed of the hot air, the cooling speed of the hot-blast stove is controlled to be 1-8 DEG C / h. According to the stove cooling method, the hot-blast stove to be subjected to first-aid repair can be independent from a hot-blast stove system, the coolingspeed of the hot-blast stove can be strictly controlled, the temperature control requirement of stove cooling is met, and inclement accidents such as refractory brick breaking or collapsing of partssuch as the arch apex of the hot-blast stove are prevented.

Description

technical field [0001] The present application relates to the technical field of hot blast stove maintenance, and in particular, relates to an off-line cooling method of a hot blast stove. Background technique [0002] In the emergency repair of silica brick hot blast stove, the cooling effect directly determines the structural state, operating state, maintenance workload, maintenance period and life of the follow-up hot blast stove refractory. [0003] The main chemical composition of silica bricks is SiO 2 (≥93%), can exist in different crystal forms at different temperatures, and can be transformed into each other under certain conditions. The transformation of crystal forms is accompanied by stress caused by volume changes. Since the silica brick has multiple crystallization temperature zones during the cooling process, its volume expansion (or contraction) is relatively large. In order to prevent the collapse and collapse of the silica brick masonry caused by sudden sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D9/00F27D1/16
CPCF27D9/00F27D1/16F27D2009/0005
Inventor 杨国新包锋李伟王善增温映桃王宏平邹林詹开洪罗钟铭
Owner SGIS SONGSHAN CO LTD
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