High-efficiency pre-separation pulse bag-type dust collector

Abstract

The invention relates to a high-efficiency pre-separation pulse bag-type dust collector. The high-efficiency pre-separation pulse bag-type dust collector comprises a dust collector air outlet formed on an upper box body, and a dust collector air inlet formed on the lower part of a middle box body; a blowpipe, a nozzle, a framework and a cloth bag are arranged in the middle box body; the dust collector air inlet is formed on the upper part of the middle box body, and a separator is arranged between the dust collector air inlet and the framework; the cloth bag is arranged on the framework; and a guide plate is arranged below the separator. The high-efficiency pre-separation pulse bag-type dust collector has the advantages that: the motion distance of flue gas and particles inside the dust collector is increased, the adsorption efficiency of alumina particles is improved, the adsorption effect in the whole purification process is improved, gas-solid separation is realized before dust reaches a filter bag, the compressed air consumption is reduced, the load of the filter bag is reduced, and the service life of the filter bag is prolonged. The dust collector is limited to an electrolysis flue gas purification system, and can be applied to other industries of dust removal and flue gas purification.

Description

technical field [0001] The invention relates to a bag filter, in particular to a high-efficiency pre-separation pulse bag filter which can be used in the recovery and treatment of smoke and dust in non-ferrous metals, iron and steel, cement and other industries. Background technique [0002] In the dry purification process of electrolytic aluminum flue gas, the bag filter plays an important role. It not only filters dust and captures particulate matter, but the filter layer on the bag also plays the role of absorbing hydrogen fluoride in the flue gas. Research It is found that about 5% of the hydrogen fluoride in the electrolysis flue gas is adsorbed on the filter layer of the dust collector. Therefore, it is an important equipment to ensure the efficient adsorption of hydrogen fluoride. At present, there are two types of dust collectors used in domestic electrolytic aluminum plants, one is the reverse blowing dust collector, and the other is the traditional pulse dust coll...

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Problems solved by technology

However, the dust collector also has the following technical problems during operation: (1) The airflow is unevenly distributed inside the dust collector, the airflow velocity in some areas reaches 3-5 m / s, and the flow velocity in some areas is maintained at 0-0.5 m / s ; (2) The mixing of alumina particles and flue gas is not sufficient, and the adsorption reaction cannot be completed well; (3) The filter bag is heavily loaded, and a large amount of alumina particles must be added to the pipeline before the reaction, and the particle concentration reaches 100~ 150g / m 3 , most of these particles are brought to the filter bag, resulting in heavy load on the filter bag and frequent dust cleaning; (4) The service life of the filter bag is short and the amount of maintenance is large

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