Top pressure increasing baking method of blast furnace

Abstract

The invention relates to a top pressure increasing baking method of a blast furnace. The top pressure increasing baking method comprises a cold air passing phase, a three-grade heating and temperature keeping phase and a final cooling phase in sequence; when the third-time temperature keep is performed, the top pressure of the blast furnace is increased by 10 kpa every a certain time, and is finally not higher than 70 kpa; and the waste gas humidity of the blast furnace is equal to the atmospheric humidity, and the central temperature of first and second layers of supercompact clay bricks of the blast furnace is not lower than 90 DEG C, the third-time temperature keeping is stopped. The top pressure increasing baking method of the blast furnace can slowly and stably heat up the temperature in the furnace, enables the moisture to be slowly evaporated, prevents the rupture and pulverization of refractory brick layers caused by quick dehydration, and prolongs the service life of the blast furnace; and the method controls the top pressure of the furnace body to be slowly heated up in the baking process, can urge the moisture to be condensed to water drops to slip along the inner wall of the blast furnace and to be drained from a drain hole in the furnace bottom, and can quicken the discharge of the moisture.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for raising the top of a blast furnace and pressing a furnace. Background technique [0002] The blast furnace is an important equipment in the metallurgical industry. When the blast furnace is smelting, the temperature inside the furnace is as high as thousands of degrees Celsius. In order to ensure safety, multiple thermocouples are buried along different depths in the furnace bottom of the blast furnace from the refractory brick layer to the furnace body of the stave to monitor the temperature of the blast furnace body in real time. Under normal circumstances, the temperature of the furnace body gradually decreases from the inside to the outside. , the stave temperature should be below 30°C. If the thermocouple detects that the temperature of a layer is higher than the normal range, it indicates that the layer of refractory bricks has been damaged, and if it is ...

AI Technical Summary

Problems solved by technology

However, there is currently no standard blast furnace baking method in China. In the past, blast furnace baking was only based on experience.

There is no mature and reliable oven technology, so it often occurs that the temperature of some parts of the refractory layer is detected to be high soon after the blast furnace smelting operation starts, and the damage point gradually expands over time, eventually leading to complete damage of the blast furnace, which significantly reduces the life of the blast furnace

Moreover, the existing oven method focuses on controlling the temperature of the oven to increase slowly to avoid damage to the furnace body, which results in a relatively long time for the oven process

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