Off-line stove cooling method for hot-blast stove

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...

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.

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