Converter dust removal equipment through semidry method

Abstract

The invention provides converter dust removal equipment by semidry method. Two ends of the equipment are connected with a vaporization flue and a fan respectively; the equipment comprises a dry evaporative cooler, a wet electrostatic precipitator, dry dust outward transport equipment, circulating water treatment equipment and mud or sludge outward transport equipment, wherein the dry evaporative cooler is connected with the vaporization flue and is used for cooling high-temperature flue gas and performing coarse dust removal; the wet electrostatic precipitator is respectively connected with the dry evaporative cooler and the fan and is used for fine dust removal and demisting of the flue gas; the dry dust outward transport equipment is connected with the dry evaporative cooler; the circulating water treatment equipment is connected with the wet electrostatic precipitator; the mud or sludge outward transport equipment is connected with the circulating water treatment equipment. The dry evaporative cooler and the wet electrostatic precipitator are combined, so that the dust concentration of the discharge flue gas and recovered coal gas can be reduced, the sewage treatment amount of washing the dust is reduced, and the energy consumption is reduced. The equipment is simple in structure and easy to maintain, the explosion hidden danger is reduced, direct emission pollution of dirt flue gas is eliminated, and the equipment is suitable for novel converter dust removal and is particularly suitable for technical transformation of conventional wet and dry dust removal systems.

Description

technical field [0001] The invention relates to the technical field of metallurgical environmental protection and resource recovery and utilization. Specifically, the invention relates to a converter semi-dry dedusting equipment that combines a dry evaporative cooler and a wet electrostatic precipitator for primary flue gas of a converter. Background technique [0002] In the prior art, the primary dedusting of the converter has always been carried out by wet method, and a small part by dry method. figure 1 It is a schematic diagram of a module structure of a converter wet dedusting equipment in the prior art. Such as figure 1 As shown, the converter 101 is used as a flue gas source and is connected to a fume hood 102 for collecting flue gas, and then connected to a 20-30 meter long vaporization flue 103 to cool the flue gas. Then the vaporization flue 103 is connected with the wet dedusting equipment 100, which can include a water spray cooler 104, a fine dust collector 1...

AI Technical Summary

Problems solved by technology

[0004] 1. The dust concentration of exhaust gas and recovered gas is as high as 50-100mg / Nm 3 , can no longer meet the environmental protection control requirements of China and most countries and regions in the world, especially the dust emitted is mostly PM2.5 fine particle dust, which is extremely harmful. The recovery of gas usually requires a wet electrostatic precipitator after the gas cabinet. Purified to ≤10mg / Nm 3 It can be economically used as fuel; and for direct power generation of gas turbines, it needs to be further purified at the inlet to ≤1mg / Nm 3 ;

[0005] 2. Water treatment requires a lot of investment, covers a large area, and has high operating costs

[0006] 3. High energy consumption, the power consumption of the primary dust removal fan caused by the high energy consumption of the circulating water treatment operation and the high fan pressure is about 2 times the power consumption of the dry method

[0009] 1. Large amount of maintenance: mainly due to the dust accumulation of the evaporative cooler 204, the gas pipeline, especially the dry electrostatic precipitator 205, the maintenance amount and cost of the equipment are large, and the maintenance process affects the production of the converter 201;

[0010] 2. There are many automatic control chains, and the operation and maintenance are difficult. When the system is running normally, it is very good. Once a problem occurs, it is difficult to detect and maintain, which also reduces the operation rate of the converter 201;

[0011] 3. There are hidden dangers of explosion venting in different degrees. Explosion venting not only damages the equipment, but also leads to direct discharge of dirty smoke pollution

[0012] Chinese invention patent CN02136785.X discloses a converter semi-dry dedusting process, which combines evaporative cooling scrubber + wet electrostatic precipitator. Like the wet process, all dust is washed into the drainage, although the water treatment capacity is reduced. However, it cannot completely solve the problem of sewage treatment

Chinese patent CN10138263A discloses a converter flue gas cooling and purification method, which uses a dry evaporative cooler to initially cool and purify the flue gas, but uses a Venturi tube for fine dust removal, and the energy consumption and emissions of dust removal are still high

Japanese patents JPA 1981075508, JPA1987093308, and JP 63297520A 1-5 all disclose different types of converter semi-dry dedusting processes and equipment. Dry cooling dedusting adopts blade dust removal + filter dust removal, cyclone dust collector + waste heat boiler, or particle layer cooling Different dry high-temperature flue gas cooling and coarse dust collectors such as dust removal, but the wet dust removal still uses the Venturi tube, which cannot solve the problem of high energy consumption caused by the high pressure of the wet fan

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