Converter flue gas purification and waste heat recovery system and method

Abstract

The invention relates to a converter smoke gas purification and afterheat recovery system and method. The system comprises a vaporization cooling flue and an afterheat recovery device, wherein a cotton filter is arranged on the flue arranged between the vaporization cooling flue and the afterheat recovery device, and is used for filtering big particle dust and at least partial fine particle dust in the smoke gas. The converter smoke gas purification and afterheat recovery system and method provided by the invention have the advantages that the cotton filter is used for filtering away big particle dust in the smoke gas in front of the afterheat recovery device; the big particle dust carrying sparks are prevented from entering the afterheat recovery device, so that the explosion of the smokegas in the afterheat recovery device can be prevented; in addition, the cotton filter can be used for filtering most fine particle dust, so that the quantity of dust entering the afterheat recovery device is little; the problem of too low efficiency of the afterheat recovery device due to dust adhesion can be effectively avoided; the flushing abrasion of the dust on the heated surface of the afterheat recovery device can be reduced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a converter flue gas purification and waste heat recovery system and method. Background technique [0002] One of the most important steps in converter steelmaking is oxygen blowing decarburization. During this process, the converter will produce a large amount of flue gas, the main components of which are 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. The initial temperature of converter gas is about 1600°C, which contains a large amount of dust from steelmaking, and the dust content is about 80-150g / m 3 , the main components of dust are FeO, Fe, CaO, MnO, SiO 2 And C, etc., may burn when exposed to oxygen. Converter gas is flammable and explosive, and its explosion conditions are as follows: 1) CO content is wit...

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Problems solved by technology

However, these methods have not been applied in industry, and at the same time, there are also the following disadvantages: 1) the above methods cannot completely solve the problem of converter gas explosion in the middle and low temperature section; It not only affects the heat exchange efficiency, but also affects the normal operation of the system; 3) If the bag is used for fine dust removal, there is usually a risk of burning; if the electrostatic precipitator is used, it often affects normal production due to frequent explosion venting

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