Converter flue gas treatment system and operation method thereof

Abstract

The invention relates to a converter flue gas treatment system which comprises a converter smoke hood, an evaporative cooling flue, a waste heat recovery device, a dust removal mechanism and a switching station which are sequentially connected through a flue gas pipeline, a flue gas outlet of the switching station is connected with a diffusion chimney and a gas holder, the flue gas pipeline between the evaporative cooling flue and the waste heat recovery device comprises a mixed flow pipe body, and a swirler capable of enabling flue gas to generate rotational flow is arranged in the mixed flow pipe body. In addition, the invention also relates to an operation method of the converter flue gas treatment system. According to the system and the operation method, the swirler is arranged in the pipeline in front of the waste heat recovery device, so that the contact collision probability between the gas component of the flue gas and oxygen can be increased, the oxygen contained in the flue gas and the residual oxygen in the pipeline can be quickly consumed, and the possibility that the gas is mixed with the oxygen to explode when the temperature of the gas is reduced to be below the spontaneous ignition point is obviously reduced; and in addition, by means of the rotational flow effect of the flue gas, a certain smoke dust removal effect can be achieved, and the situation that the interior of the waste heat recovery device is blocked by dust is reduced.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular relates to a converter flue gas treatment system and an operating method thereof. Background technique [0002] Converter steelmaking is currently the most important steelmaking method. Oxygen blowing decarburization is one of the most important processes in converter steelmaking. During the process of oxygen blowing decarburization, the converter will generate a large amount of flue gas, the main component of which is CO (about 66%), CO 2 (about 16%) and N 2 (about 17%), and a small amount of O 2 and Ar. Because converter flue gas contains a large amount of CO, converter flue gas is also called converter gas, which is flammable and explosive. The initial temperature of converter gas is generally around 1600°C, which contains a large amount of dust generated from steelmaking, and the dust content is about 80-150g / m 3 , the main components of dust are FeO, Fe, ...

AI Technical Summary

Problems solved by technology

At this time, when the flue gas at about 900°C is directly sprayed with water or cooled by water mist, all the waste heat is wasted and cannot be recovered, which affects the overall energy efficiency of the system

In addition, due to the small dust particles in the converter flue gas, it is difficult for the dust removal effect of the electrostatic precipitator to achieve the effect of ultra-low emission

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