Pulsed type bag dedusting device

Abstract

The invention discloses a pulsed type bag dedusting device which comprises a box combined type bag dust collector, a pulse airflow back-flushing cooling device and a second draught fan, wherein the pulse airflow back-flushing cooling device is arranged on the box combined type bag dust collector; the second draught fan is used for forming negative pressure suction in the pulse airflow back-flushing cooling device; the box combined type bag dust collector comprises at least two dedusting boxes, an exhausting channel, an air inlet channel and a dust collecting device; the dedusting boxes are successively arrayed from left to right; each dedusting box comprises a lower dust filtering chamber, an upper sealing air chamber, a sealing pattern plate, a cloth bag, a dust collecting hopper and a lifting valve device; the sealing pattern plate with a plurality of through holes is arranged between the lower dust filtering chamber and the upper sealing air chamber; the cloth bag is arranged on the position corresponding to the through holes on the sealing pattern plate; and an air inlet port of a second high temperature draught fan is communicated with an air outlet of the exhausting channel. The pulsed type bag dedusting device has the characteristics of reasonable structure design, complete function, high dedusting efficiency, safety, reliability, long service life and ultrahigh marketing value.

Description

technical field [0001] The invention relates to a dust removal device, in particular to a pulse bag dust removal device for filtering dust-containing tail gas generated during the processing of expanded perlite. Background technique [0002] During the production process of expanded perlite, the dust is sucked out by the exhaust fan, and the large particles and fine dust are separated through the inertial filter, and then filtered by the bag filter again and discharged into the atmosphere. The bag filter currently used is mainly the air box bag filter, but the traditional air box bag filter still has the following defects: 1) In terms of engineering design, most of the dust removal systems of the air box bag filter are A single-box pulse bag filter is used as the purification equipment for dust-containing gas. Due to the high dust concentration of the inhaled dust-containing gas, if the single-box pulse bag filter performs pulse back blowing during dust removal, it will not ...

AI Technical Summary

Problems solved by technology

The bag filter currently used is mainly the air box bag filter, but the traditional air box bag filter still has the following defects: 1) In terms of engineering design, most of the dust removal systems of the air box bag filter are A single-box pulse bag filter is used as the purification equipment for dust-containing gas. Due to the high dust concentration of the inhaled dust-containing gas, if the single-box pulse bag filter performs pulse back blowing during dust removal, it will not only reduce the blowback. The dust blowing effect also greatly shortens the service life of the bag, increases the frequency of replacing the bag and the workload of maintenance, and also greatly increases the operating cost of the user, and once the single box bag filter fails, it will cause The purification effect of the pulse bag filter is reduced, and the dust emission concentration after purification often cannot meet the national emission standards; 2) The bag filter is a common dry dust removal device, which is suitable for capturing small, dry, non-fibrous Dust, the principle is to filter the dust-containing gas by using the filtering effect of fiber fabrics. When the dust-containing gas enters the bag filter, the dust with large particles and high specific gravity will naturally settle due to the action of gravity and fall into the ash storage hopper; Dust is retained by the filter bag

The fine dust in the air is blocked by the bag and adheres to the bag. With the increase of the working time of the bag filter, more and more dust is accumulated on the bag, and it becomes more and more difficult for the gas to pass through the bag, which affects the performance of the bag filter. The efficiency of dust removal can cause damage to the equipment

Therefore, a dust removal device needs to be installed on the bag filter to regularly remove the dust on the bag, and a method in the prior art is to install a vibrator in the bag filter, and the vibrator vibrates all the bags to achieve the purpose of cleaning. The defect of this cleaning method is that the bag filter is often affected by mechanical force and is damaged quickly; another method is to use a blower to perform large-area rotary blowing. The blowing effect is poor, causing a large amount of dust to accumulate on the cloth bag, the suction resistance increases, and the air volume decreases, so that a large amount of dust generated during the production of expanded perlite cannot be effectively discharged, causing a large amount of dust to enter the factory building and pollute the air environment; 3) The material of the bag in the air box bag filter is usually glass fiber film, and the limit temperature that can withstand is 250°C. Generally, the normal working temperature does not exceed 180°C. The temperature of the dust tail gas is generally 300 ℃ ~ 400 ℃. If the flue gas with relatively high temperature enters the bag filter and is not within the reasonable range of the filter bag for a long time, it will cause danger, and at least it will cause equipment damage and affect production. In severe cases, the temperature and pressure in the bag dust removal gas will rise, which will easily cause the equipment to burst and endanger the life safety of the workers. It does not have a temperature control device and a pressure detection device, so the safety is not high and the service life is short.

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