Blast furnace hearth and blast furnace hearth pouring long life prolonging method

Abstract

The invention relates to a blast furnace hearth and a blast furnace hearth pouring long life prolonging method. The blast furnace hearth comprises a furnace shell, a pouring layer, a cooling wall, a ramming layer, carbon bricks and a furnace hearth pouring layer. The side walls of the furnace shell, the pouring layer, the cooling wall, the ramming layer, the carbon bricks and the furnace hearth pouring layer are arranged in sequence from outside to inside, and the furnace bottoms of the furnace hearth pouring layer and the carbon bricks are arranged from top to bottom. The method comprises thesteps that after the charge level is lowered, the water fetching amount for cooling furnace hearth scrap iron in slag is controlled through intermittent water fetching operation and evaporation cooling operation; a first drill hole and a second drill hole are formed in the furnace hearth region according to the thickness calculation of the furnace shell, the pouring layer and the cooling wall, and the first drill hole and the second drill hole communicate with each other; a press-in short pipe is arranged in the first drill hole, a valve is installed on the short pipe to be used for follow-upair exhaust, drainage and press-in operation, and the valve is closed after the operation is accomplished; baking operation is conducted after furnace hearth pouring operation is accomplished, and drain valves are sequentially opened to conduct air exhaust and drainage; and the baking operation of the furnace hearth is accomplished, and carbon quality materials are pressed into the cooling wall and the ramming layer by the press-in short pipe in the blowing-in material charging process after the drain valves are opened to drain water.

Description

technical field [0001] The invention relates to the technical field of blast furnace technology, more specifically, it relates to a blast furnace hearth and a method for improving the casting longevity of the hearth. Background technique [0002] At present, the iron-making industry is very sure of the various hazards of water to the hearth carbon bricks, and tries to reduce the water intake in the hearth during production. More and more rapid repairs of the existing blast furnace hearth are carried out by pouring, that is, after the blast furnace has finished lowering the material level, in order to achieve the purpose of shortening the construction period and quick repair, before the hearth is ready for construction, the method of cooling the furnace with water is adopted. The method quickly lowers the temperature of the high-temperature slag and iron in the hearth. During the process of pumping water to cool the furnace, part of the water overflowed the blast furnace in ...

AI Technical Summary

Problems solved by technology

If these gaseous water and condensed water cannot be discharged from the furnace body in time, the heat transfer effect between the new casting material of the furnace hearth and the carbon brick, the ramming layer between the carbon brick and the cooling wall, and the cooling wall will be greatly reduced. New castables will be eroded faster, resulting in shortened hearth pouring life

Therefore, if gaseous water and condensed water are formed during hearth pouring, if they are not discharged out of the hearth in time, it will affect the overall heat transfer of the hearth, resulting in a significant shortening of the life of the hearth after pouring. However, there is no blast furnace in the existing blast furnace technology Hearth and its casting longevity improvement method

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