Rapid furnace cooling method of improved top combustion type hot-blast stove

Abstract

The invention relates to a rapid furnace cooling method of an improved top combustion type hot-blast stove. The method comprises the steps that a hot air eduction pipe and an annular water fetching pipe are manufactured according to the diameter of a combustion chamber manhole before furnace cooling; in the blast furnace lowering charge level stage, a blast furnace blower is used for supplying air, and the arch crown temperature of the hot-blast stove is lowered to about 950-900 DEG C; in the separation process of a hot-blast stove system and a blast furnace system, the manhole in a hot-blaststove combustion chamber is opened, and the originally-manufactured hot air eduction pipe and the annular water fetching pipe are installed; after the hot-blast stove system is completely cut off, thehot air eduction pipe and the annular water fetching pipe are opened to fetch water, the blast furnace blower is used for blowing air to cool the stove, and the blast capacity of the blast furnace blower is gradually increased according to a progressive principle; and the arch crown temperature is lowered to about 60 DEG C or below, and protective cooling of the hot-blast stove is finished. The method has good popularization significance in reducing the influence on production of iron-making blast furnaces.

Description

technical field [0001] The invention relates to the technical field of blast furnace hot blast stove technology, more specifically, it relates to a fast cooling method of an improved top-combustion hot blast stove. Background technique [0002] Because there is no strict requirement for crystal orientation transformation in the cooling of high-alumina brick hot blast stoves, rapid and protective cooling can be considered in hot blast stove repairs. The existing method of cooling the hot blast stove is to use the combustion-supporting fan to blow air through the combustion-supporting air pipe-burner-regenerator lattice brick-furnace grate-flue. After the temperature of the furnace grate exceeds the control temperature, the hot blast stove The bottom manhole blows air into the furnace grate through the axial flow fan, and then exhausts the air through the hot air branch pipe-hot air main pipe-backflow pipe to cool the furnace. Because the checker bricks store a lot of heat, t...

AI Technical Summary

Problems solved by technology

Because the checker bricks store a lot of heat, the grate will heat up quickly due to reverse blowing, and it is easy to reach the control standard. If the temperature continues to rise, it will cause damage to the grate, and even endanger the collapse of the regenerator. 400-600mm), resulting in a small exhaust capacity, this traditional cooling method usually exceeds 10 days

If you want to speed up the process of cooling the stove, there is another way to fetch water or atomize during the air supply process, but both will cause irreversible damage to the refractory materials of the hot blast stove, greatly reducing the refractory materials of the hot blast stove or the overall life of the hot blast stove, which is not worth the candle.

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