Coal gas treatment method for eliminating black smoke from top of blast furnace

Abstract

The invention discloses a coal gas treatment method for eliminating black smoke from the top of a blast furnace. According to the method, under the condition that no equipment is added, the problem that black smoke is emitted from the top of the blast furnace in the damping down and reblowing processes of the blast furnace is solved by changing a coal gas treatment operation program and utilizingan existing dry dedusting coal gas purification system. Specifically, according to the method, in the damping down and reblowing processes of the blast furnace, under the condition that the interior of the furnace is still under positive pressure, a blow-off valve at the top of the furnace is not opened, coal gas is introduced into a cloth bag dedusting box, the coal gas is dedusted through the dedusting function of a cloth bag, and then clean coal gas is discharged through a blow-off pipe of a cloth bag deduster, so that the phenomenon that black smoke is emitted from the top of the furnace in the damping down and reblowing processes is completely eliminated.

Description

technical field [0001] The invention relates to a method for shutting down and restoring air of a blast furnace, in particular to a gas treatment method for eliminating black smoke from the top of a blast furnace during the process of shutting down and restoring wind of a blast furnace. Background technique [0002] Shutdown and revival of blast furnace is a blast furnace operation method in which blast furnace production is temporarily stopped and then resumed. The basic operation of stopping production and resuming production of blast furnace is to stop the air supply to the furnace and resume the air supply to the furnace. During the normal operation of the blast furnace, a large amount of black smoke will be released from the top of the furnace during the shutdown and recovery process, which will cause serious pollution to the environment. The main reason for the black smoke: the pressure inside the blast furnace is about 420KPa during normal production, and the pressur...

AI Technical Summary

Problems solved by technology

For example, the utility model patent "A Blast Furnace Top Gas Purification and Discharge Device" with application number 2017201780512 can solve the problem of black smoke from the furnace top, but it needs to add a gas purification discharge device (second dust collector). The second dust collector is installed on the ground, because the pipeline is too long, it is difficult to guide the gas, and the expected effect cannot be achieved

If the second dust collector is installed on the furnace roof, it is difficult to find a suitable position due to the high position of the furnace roof and the small space, and if the dust accumulation of the second dust collector is not handled properly, it will become another source of pollution

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