Multi-stage humidification powder dedusting method and device for cyclic dedusting

Abstract

The invention discloses a multi-stage humidification powder dedusting method and a multi-stage humidification powder dedusting device for cyclic dedusting. The method comprises the following steps of: conveying output powder by using a conveyor device, performing first-stage humidification on the powder in the conveyor device, at least performing second-stage humidification on the powder which is not fully humidified and discharging the powder; and simultaneously performing suction separation on dust-containing gases produced by the humidification and treating the gases by utilizing a wet dedusting method. In the method and the device, the dust-containing gases are treated by adopting the wet dedusting method, dedusting wastewater is used for cyclically humidifying the powder, a water volume is extremely easy to regulate and control, the humidified powder stably keeps a critical saturation state and the problems of difficulties of conventional equipment in water volume adjustment are solved.

Description

technical field [0001] The invention belongs to the gravity dedusting technology, in particular to a multi-stage humidifying powder dedusting technology for unloading ash from a blast furnace gravity deduster. Background technique [0002] Blast furnace gravity dust collector background technology: At present, the domestic blast furnace gravity dust collector ash unloading and loading equipment is mainly a double-shaft stirring humidifier, and there are several problems: the humidification water volume is not easy to adjust during the blast furnace gravity dust collector unloading and loading operation, If the amount of water is too large, it will be muddy; if the amount of water is small, a large amount of dry ash that has not been humidified will cause serious dust; due to the high pressure of the blast furnace dust collector, the discharged gas ash entrains gas, and the high temperature of the gas ash in the blast furnace gravity dust collector is as high as 150 ° C. Humi...

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Problems solved by technology

[0002] Blast furnace gravity dust collector background technology: At present, the domestic blast furnace gravity dust collector ash unloading and loading equipment is mainly a double-shaft stirring humidifier, and there are several problems: the humidification water volume is not easy to adjust during the blast furnace gravity dust collector unloading and loading operation, If the amount of water is too large, it will be muddy; if the amount of water is small, a large amount of dry ash that has not been humidified will cause serious dust; due to the high pressure of the blast furnace dust collector, the discharged gas ash entrains gas, and the high temperature of the gas ash in the blast furnace gravity dust collector is as high as 150 ° C. Humidification with water produces a large amount of water vapor, and part of the gas ash that has not been stirred and humidified is spewed out by water vapor and gas, resulting in a large amount of dust in the ash transportation area, and poisonous and harmful mixed gases such as gas, dust, and water vapor are everywhere. Diffuse seriously pollutes the on-site environment; gas, dust, water vapor and other toxic and harmful mixed gases diffuse everywhere, affecting the safety and health of on-site ash unloading workers; gas, dust, water vapor and other toxic and harmful mixed gases diffuse everywhere, and observe the ash discharge on site The loading situation is relatively difficult, which often causes the loading dust to spill out of the compartment, causing pollution on the working ground, etc., and then affecting the surrounding environment; equipment is easy to be blocked, and gas ash is easy to adhere to the blades of the dual-axis agitating humidifier, causing equipment jams Blockage, poor material conveying, large amount of operation and maintenance

However, the application of the above-mentioned technology has not completely solved the above-mentioned problems. The reason is that the high-temperature dust at 150°C will generate a large amount of water vapor during the humidification process. The water vapor will cause the gas ash and gas to spew out, and the water vapor still contains The diffusion of dust and dusty gas will still cause the above problems

However, there is no relevant literature on how to solve the above problems

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