Converter baking method performed after 120t converter replaces furnace lining refractory material

Abstract

The invention discloses a converter baking method performed after a 120t converter replaces a furnace lining refractory material. The method comprises the following steps that (1), eight tons of coke and one ton of waste wood are added into the converter before converter baking is performed, and the wood is ignited; (2), an oxygen lance is fed for blowing oxygen, and after the wood is ignited, the coke is added into the converter in batches from a stock bin at the top of the converter; (3), the oxygen flow is controlled, specifically, the flow is set as 5000 m<3> / h before the oxygen lance is fed, and the flow is adjusted to 8000 m<3> / h according to the combustion situation; (4), the position of the oxygen lance is controlled, specially, the height between the oxygen lance and the top face of the coke in the converter is 2.5 m before blowing, twenty minutes later, the position of the oxygen lance is raised, and the temperature of a furnace lining maintains being raised uniformly; (5), bottom blowing is controlled, and specifically a bottom blowing device is started to blow nitrogen gas; (6), converter baking is finished, specially the temperature of the furnace lining in the later period of converter baking reaches 780-820 DEG C, converter baking is finished, and hot metal is charged for converting immediately after the oxygen lance is lifted. By means of the converter baking method, the temperature is raised at a uniform speed in the converter baking process, natural water and crystal water in the furnace lining refractory material are removed completely, the furnace lining is tight in combination after converter baking, the hearth temperature reaches the design requirement, the converter baking time is shortened, and the service life of the furnace lining is prolonged.

Description

technical field [0001] The invention belongs to a furnace method for replacing furnace lining refractory materials in a 120-ton converter of a steelmaking enterprise, in particular to a furnace method for replacing furnace lining refractory materials in a 120-ton converter. Background technique [0002] The purpose of the converter oven is to remove the natural water and crystal water in the refractory material of the furnace lining, so as to avoid the furnace body bursting, bubbling or deformation or even the collapse of the furnace wall due to the rapid rise of furnace temperature and the large expansion of water when smelting molten steel. , affecting the strength and service life of the converter lining. [0003] It takes 4 hours to open a new furnace for a 120t converter, which not only takes a long time but also causes uneven heating of the furnace temperature, resulting in poor furnace effect and shortened furnace lining life. SUMMARY OF THE INVENTION [0004] The ...

AI Technical Summary

Problems solved by technology

[0002] The purpose of the converter oven is to remove the natural water and crystallization water in the lining refractory material, so as to avoid the furnace body bursting, bubbling or deformation and even the furnace wall collapse due to the rapid rise of the furnace temperature when the molten steel is smelted. , affecting the strength and service life of the converter lining

[0003] The 120t converter opened a new furnace and baked it for 4 hours. Not only did the furnace take a long time, but also the furnace temperature rose unevenly, resulting in poor baking effect and shortened furnace lining life.

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