Gas drying type dust removal system of converter

Abstract

The invention relates to a primary dust removal system of a converter, which adopts a complete drying method for dust removal. A tower / venturi system and a sewage treatment system are eliminated, the system is changed into a multi-stage gas heat exchange type dust removal device, and environmental protection requirements can be finally achieved via introduction of high-temperature flue gas into the multi-stage gas heat exchange type dust removal system through a vaporizing and cooling flue, prevention of mixing between cooling air and the high-temperature gas, primary dust removal during cooling of the flue gas, and flow of the cooled flue gas into a gas bag type dust removal device for secondary dust removal. The gas drying type dust removal system has a simple structure, can be operatedconveniently, occupies a small space, needs low investment and no water, and is power-saving. Heat of the air can be further recycled after heat exchange, and a large amount of energy can be saved for steel mills.

Description

technical field [0001] The invention relates to a primary dedusting system, in particular to a converter gas dry dedusting system, which adopts a multi-stage gas heat exchange dedusting system to realize complete dry dedusting of the converter. Background technique [0002] At present, most of the primary dedusting systems for converters in China use OG wet method, LT dry method, and semi-dry Tavan system, among which OG wet method is the most widely used and has the most problems. [0003] The traditional OG wet dust removal was jointly developed by Nippon Steel and Kawasaki in the 1960s. It consists of flue gas cooling, purification, and sewage treatment systems. The main equipment includes two-stage venturi tubes, dehydrators, and water mist For separators and other equipment, water is used as the working medium, and a large amount of water is sprayed at the first and second places to reduce the temperature of the flue gas of the converter from 900-1000 degrees to about 2...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: the dust content of the treated gas is high, usually above 100mg / Nm3; the secondary pollution of the sewage system is serious; the system resistance loss is large; the floor area is large, the energy consumption is high, and the maintenance and operation costs are high.

[0006] No matter which method is used for dust removal, there are two common problems: a large amount of new water is consumed. According to the average consumption level of 0.5 tons of new water per ton of steel, the annual consumption of new water in the country reaches 200 million tons; The flue gas temperature is 900-1000 degrees, this part of the heat is lost in vain, and the heat is absorbed by the water, and the water needs to be cooled, which consumes a certain amount of electric energy

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