Semi-dry dedusting device and process for steelmaking converter flue gas with waste heat recovery

Abstract

Disclosed is a novel semi-dry method steelmaking converter smoke dust removal device with a waste heat recovery function. The device comprises a converter, a cover skirt, a vaporization flue, a smoke preprocessor, a high-temperature connecting flue, an anti-detonation explosion-proof vertical flue type waste heat boiler, a circulation cyclone dust collector, a circular seam dust collector, a combined dehydrator, an induced draft fan and a switching station, wherein the converter, the cover skirt, the vaporization flue, the smoke preprocessor, the high-temperature connecting flue, the anti-detonation explosion-proof vertical flue type waste heat boiler, the circulation cyclone dust collector, the circular seam dust collector, the combined dehydrator, the induced draft fan and the switching station are communicated in sequence. The gas exhausted by the induced draft fan passes through the switching station and is connected with a gas holder and a diffusion tower. The circulation cyclone dust collector is communicated with a converter dust recycling system through a total ash bin of an ash conveying system. The provided device and a technology have the advantages that converter smoke dust removal and water conservation, converter smoke waste heat recovery, converter fan electricity saving and converter dust recycling are achieved, the pure dry converter dust collection rate is 80%, energy conversation and environmental protection are achieved, the operability is high, and the economic benefit is high.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a new semi-dry dedusting device for steelmaking converter flue gas with waste heat recovery. Background technique [0002] Steelmaking converter flue gas is the most special flue gas in the metallurgical industry. It has three major resources: one is the high temperature of the flue gas, which can reach 800-1000 °C; the second is the high content of CO, which can reach 70%; High dust concentration, about 80~150g / m 3 . When these three resources are integrated, flue gas dust removal becomes a difficult problem. [0003] At present, the converter flue gas dedusting process adopted at home and abroad is to spray water to cool down and purify. The processes include: OG method, LT method, and a small amount of semi-dry method. The difference between these three processes lies in the different water spraying methods: OG method—two-stage Venturi tube water spraying;...

AI Technical Summary

Problems solved by technology

[0004] The most common feature of the above three dedusting processes is the consumption of water resources and the minimization of the efficiency of the three major resources of the converter flue gas: the heat energy of the converter flue gas cannot be recovered; the converter CO gas becomes water and steam gas; the converter dust loses iron oxide, The original properties of the oxides of calcium oxide and magnesium oxide become hydrous iron oxide, calcium hydroxide, magnesium hydroxide and other substances, which cannot be directly returned to the converter for use

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