A Furnace Charge Replacement Method Under A Blast Furnace Accident

Abstract

The invention discloses a furnace charge replacement method under a blast furnace accident. Blast furnace air supply continues to be carried out through an existing air supply system under the condition that blast furnace top pressure is normal pressure. The area of an air opening is reduced (the air opening is blocked, and the diameter of the air opening is reduced). After air supply, a certain amount of coke is added, then light load materials and clean coke are added at intervals for feeding, and the light load materials are obtained through gradual transition according to the furnace temperature, the furnace condition antegrade condition and the slag iron discharge condition. The furnace temperature is sufficient, discharging is carried out stably and smoothly, the air opening is gradually opened to increase the air blast according to the condition of the furnace top pressure, a work air opening is more than 2 / 3 of the whole air opening, replacement of heavy load materials is completed, blast furnace temperature is sufficient, and furnace blocking materials start to be fed. Slag iron is treated in a normal production manner, the labor intensity of workers cannot be increased, the workers do not need to enter a blast furnace, and water lifting is avoided. Meanwhile, when air supply restores, the blast furnace is basically filled with coke, air supply restores relatively smoothly, and the probability of bursting cool slag iron through blasting is extremely low. The influence on the service life of the blast furnace is small. Treatment cost is low, treatment time is short, and the influence on production is small.

Description

technical field [0001] The invention relates to a method for sealing a blast furnace, in particular to a method for replacing furnace charges under a blast furnace accident. Background technique [0002] Since blast furnace smelting is carried out in a closed container under high temperature and high pressure, when an accident occurs, the blast furnace must stop production for accident handling. However, the handling of the heavy-duty charge in the blast furnace has always been a difficult problem for technicians. There are two ways to deal with the high-temperature and heavy-duty charge in the blast furnace: [0003] 1. Blast furnace tuyere scraping method: that is, manually pick out the charge inside the blast furnace from the blast furnace tuyere. This treatment method has some disadvantages in actual operation: it takes a long time, and thousands of tons of furnace materials have to be cooled by pumping water, and they are manually pulled out from the tuyere, which tak...

AI Technical Summary

Problems solved by technology

This treatment method has some disadvantages in actual operation: it takes a long time, and thousands of tons of furnace materials have to be cooled by pumping water, and they are manually pulled out from the tuyere, which takes as little as half a month and as much as 1-2 months.

Reduce the service life of the blast furnace, because water needs to be pumped when cleaning the hearth, the water will contact the refractory bricks, especially the carbon bricks, which will reduce the service life of the refractory bricks, and at the same time, the blast furnace will be reduced from a high temperature state to a normal temperature state, resulting in thermal expansion and contraction of the brick body , The deformation of the steel structure will affect the stability of the overall structure

The processing cost is high. It takes a lot of cost to organize personnel to pick up materials, install safety tents, and transport thousands of tons of materials.

[0004] 2. Direct furnace sealing method: If the heavy-duty material in the furnace is not processed, the furnace is directly sealed, and the hearth of the blast furnace will inevitably freeze, which is harmful to the blast furnace and takes a long time to restore the air supply

At the same time, during the freezing process of the hearth, the tuyere is easy to fill with slag and burn out, so it must be manually handled by shutting off the wind