Combined purifying method and device

Abstract

The invention discloses a combined purifying method and the device; wherein, the method is characterized in that: the cyclone dedusting and filter bag dedusting are combined into a whole, and two-grade dedusting method is adopted. The first grade is the cyclone dedusting; the air with dust enters a rotary flue along the wall of a purifier and rotates at a high speed in the annular rotary flue; under the action of the centrifugal force, the solid particles in the dust air are separated from the air at first, and deposit at the bottom of a dust hopper arranged below the purifier. The second grade is filter bag dedusting; the dust air undergoing the first grade cyclone dedusting enters a filter bag chamber through a plurality of ring holes in the annular rotary flue from the bottom up; the filter bag is arranged in the filter bag chamber and used for fending the fine particles remained in the dust air outside the filter bag; the purified air enters a clean air chamber and is exhausted out from an air outlet of the clean air chamber. The combined dedusting method has the advantages of improved dedusting efficiency and/or purifying efficiency of the air with dust, and reducing the maintenance workload and the floor area of the equipment.

Description

technical field [0001] The invention relates to a combined purification method and device, belonging to the technical field of dust removal and purification of dust-containing gas. Background technique [0002] In metal smelting, the discharged dusty gas contains a large amount of dust, and the dust in the dusty gas needs to be recovered and reused through the recovery system, and the harmful gas in the dusty gas needs to be adsorbed and purified by adsorbents. According to the different chemical properties of different metals or harmful gases in the gas to be recovered, the adsorbent uses powdery substances with different chemical properties, and the adsorbent after adsorbing harmful gases also needs to be recycled. In order to improve dust removal efficiency and purification efficiency, it is best to carry out multi-stage separation and / or purification of dusty gas and / or harmful gas, but multi-stage separation and / or multi-stage purification generally require large equipm...

AI Technical Summary

Problems solved by technology

In order to improve dust removal efficiency and purification efficiency, it is best to carry out multi-stage separation and / or purification of dusty gas and / or harmful gas, but multi-stage separation and / or multi-stage purification generally require large equipment investment, and The equipment occupies an area and the operation and maintenance costs are high

[0003] In the current bag filter, the dust-containing gas is usually blown directly into the filter, which makes the air flow field in the filter seriously unbalanced. Generally, the local flow velocity of the air flow on one side of the box is too fast, so that the dust attached to the bag filter is extremely high. Uneven, so that the windward side of the bag cannot adhere to solid particles, and a large number of particles gather on the leeward side of the bag

Due to the uneven distribution of solid particles on the filter bag, the air permeability of the windward side is better, and some particles and harmful gases enter the clean air chamber through the filter bag, so that the purification efficiency and dust removal efficiency of the system cannot be improved.

In addition, due to the large difference in flow velocity between the windward side and the leeward side of the bag, the gas-solid two-phase flow washes the bag surface of the filter bag from the windward side, resulting in premature damage to the cloth bag, which increases the maintenance workload of the system

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