CN101254386A - Semi-offline dust bag dust collector - Google Patents

Abstract

A semi-offline dust removal bag filter belongs to the technical field of dust collectors. Its purpose is to provide a semi-offline bag dust collector which can not only improve the dust removal efficiency, reduce the resistance of the dust collector, but also avoid damage to the dust collector body caused by excessive negative pressure in the upper clean air chamber of the flower plate during dust removal. Its technical points: In the clean air chamber (9) above each row of filter bags in each bag room, there are nozzles (7) corresponding to each row of filter bags (4) in parallel, and the inlet end of the nozzle is connected to the pulse The outlet of the valve (6) is connected; the spray pipe is provided with nozzles (8) which are perpendicular to the spray pipe, have the same number as the filter bags, and are concentric with the filter bag mouth; a box with a A poppet valve (10) in two working states of fully open and half closed. Compared with offline dust cleaning, it will not increase the filter load of other bag chambers; compared with online dust cleaning, the bag chamber filtration wind speed and the wind speed between bags are reduced by 1/2-2/3, which is more conducive to the dust being stripped of settlement.

Description

Semi-offline dust bag dust collector

technical field

The invention relates to a bag filter for semi-offline dust removal, belonging to the technical field of bag filters.

Background technique

At present, the row pulse bag dust collector widely used in building materials and metallurgical industries is equipped with a 3-inch large-diameter pulse valve in each row of filter bags, through a 3-inch blowing pipe parallel to the flower plate, and the number of filter bags The injection branch pipe, which is equal and concentric with the filter bag mouth, sprays compressed air of about 0.3MPa and ejected air (the ejected air flow is 2-4 times the amount of compressed air) into the filter bag at the same time to achieve the purpose of dust removal .

Line pulse bag dust collector is divided into two types: off-line and on-line according to the cleaning method.

Off-line dust cleaning refers to cutting off the filter airflow of a certain unit to clean the filter bag of the unit; the advantage is that the cleaning efficiency is high, and the disadvantage is that when the filter airflow of a certain unit is cut off, the filter load of other filter units will be increased; at the same time, due to the cleaning unit It is a relatively closed unit. At the moment of blowing, the dust cleaning unit does not have more injection airflow to supplement, so that the space of the clean air chamber above the flower plate of the dust cleaning unit instantly forms a greater negative pressure, causing cracks in the relevant parts of the equipment. .

On-line dust cleaning refers to cleaning while filtering; the advantage is that there is no need to cut off the filter air flow of the filter unit, and the filter load of other filter units will not be increased when cleaning the dust. The disadvantage is that the finer dust particles cleaned from the filter bag are in the process of falling It is held up again by the rising airflow between the filter bags, and is absorbed by the filter bags. The dust cleaning efficiency is low, which makes the running resistance of the dust collector relatively high.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the above two types of line pulse bag dust collectors, and provide a semi-offline dust removal bag dust collector, which can not only improve the efficiency of dust removal, reduce the resistance of the dust collector, but also avoid the dust on the upper part of the flower plate during dust removal. The damage to the dust collector body caused by excessive negative pressure in the clean air chamber.

Its technical solution is: a semi-offline dust removal bag filter, including a box with an ash hopper, each bag room set in the box is composed of a room partition and a filter bag installed on the flower plate, and the flower plate The clean air chamber formed between the top of the box body, and the air inlet and outlet ducts formed by the air duct partitions are characterized in that: the clean air chamber above each row of filter bags in each bag chamber is parallel There are nozzles corresponding to each row of filter bags, and the inlet end of the nozzles is connected to the outlet of the pulse valve; the nozzles are vertical to the nozzles, have the same number as the filter bags, and are concentric with the mouth of the filter bags; A poppet valve with two working states of fully open and half closed is arranged on the box body above the bag chamber.

The semi-closed working state of the above-mentioned poppet valve is that the valve of the poppet valve is closed by 1/2-2/3.

Its technical effect is: since the poppet valve, pulse valve, spray pipe and nozzle with two working states of fully open and half closed form the pulse dust cleaning system of each bag chamber, when a certain bag chamber of the bag filter is cleaned , that is, the valve of the lifting valve of the bag chamber can be closed by 1/2-2/3 (at this time, the filtering wind speed of the bag chamber and the rising speed of the air flow between the filter bags will be reduced, which is conducive to the settlement of dust during dust cleaning), and then in turn Open each pulse valve of the bag room, spray compressed air into the filter bag through the nozzle connected to the outlet of the pulse valve and parallel to the flower plate hole, and the nozzle perpendicular to the nozzle and concentric with the filter bag mouth; While spraying into the filter bag, the surrounding air that is 2-4 times the amount of compressed air is ejected into the filter bag together; since the air outlet poppet valve is in a partially open and closed state, the clean air in the outlet duct passes through the outlet while ejecting. The air outlet is supplemented to the clean air room space above the flower plate, so as to ensure the ejection air flow and achieve the best dust cleaning effect, and will not form a large negative pressure in the clean air room space above the flower plate. It not only reduces the consumption of compressed air, but also reduces the amount of dust adsorption on the filter bag, greatly reduces the filter resistance of the filter bag and the discharge of dust-containing gas concentration at the outlet, and improves the service life of the filter bag.

Compared with offline dust removal, this semi-offline dust removal bag filter will not increase the filter load of other bag chambers; compared with online dust removal, this semi-offline dust removal bag dust collector reduces the filter air speed of the bag chamber and the wind speed between bags 1/2-2/3, more conducive to the settlement of the stripped dust. Therefore, the advantages of the semi-offline dust cleaning bag filter are very significant. It can really achieve low pressure and large air volume cleaning. Compared with the other two bag filters of the same specification and air volume, the technical and economic indicators are far ahead, and the running resistance of the whole machine is 600 -1000Pa, outlet emission <25mg/nm ³ , system fan power consumption can be saved by 30%-50%, and filter bag life can reach 3 years. Suitable for line pulse long bag dust collector or short bag dust collector.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the structure of the bag chamber of the present invention.

Detailed ways

As shown in Figures 1 and 2, a semi-offline dust removal bag filter includes a box body 3 with an ash hopper 2, and the box body is composed of a room partition 15 and a filter bag 4 installed on a flower plate 5 Each bag room 11 of each, the clean air chamber 9 that is formed between flower board 5 and the top of box body, and the air inlet channel 12 and the air outlet channel 14 that are formed by the air channel partition plate 13. In the clean air chamber above each row of filter bags in each bag room, nozzle pipes 7 corresponding to each row of filter bags are arranged in parallel, and the inlet end of the nozzle pipe is connected with the outlet of the pulse valve 6; The pipe is vertical, the same number as the filter bag and the nozzle 8 concentric with the filter bag mouth; a poppet valve 10 with two working states of fully open and half closed is installed on the box above each bag chamber.

The semi-closed working state of the poppet valve 10 refers to closing the valve of the poppet valve by 1/2-2/3.

The distance from the above nozzle to the mouth of the filter bag is 75--85mm.

The bottom of the ash hopper 2 is provided with an ash unloading device 1 .

Its working principle: when the dust-laden gas enters the ash hopper from the air inlet pipe, the large particles of dust will first fall into the ash hopper due to gravity and inertial collision, which plays the role of pre-collecting dust, and the rest of the finer dust will pass through the ash hopper with the airflow. After the filter bag is filtered, the dust is blocked on the outer surface of the filter bag, and the purified gas enters the exhaust pipe through the clean air chamber and the lift valve hole, and then is discharged into the atmosphere by the fan, thus achieving the purpose of purification. As the filtration continues, the dust attached to the outside of the filter bag continues to thicken, and the resistance of the dust collector also continues to rise. When the resistance reaches a certain value, the dust collector needs to be cleaned. "Pulse dust cleaning system" issues instructions. First, the poppet valve of the first bag room is closed by 1/2-2/3, reducing the amount of filtered gas in the first bag room (filtering wind speed is reduced by 1/2-2/3), the bag room The pulse valve is opened in turn (0.15 seconds), and the compressed air of 0.2-0.3Mpa and the air flow ejected from the air duct enter the inside of the filter bag through the nozzle and the nozzle, so that the filter bag vibrates, bulges, and accumulates outside the filter bag The dust on the surface is stripped off and falls into the ash hopper. After 4 seconds, the poppet valve of the first chamber is reopened, and the first chamber enters the filtering state again; each chamber is cleaned according to the above process in turn, and so on. The working frequency of the dust cleaning system can be adjusted according to the resistance of the dust collector.

Claims (4)

1, a kind of semi-off-line deash bag dust-cleaning equipment, comprise the casing of being with ash bucket, be arranged in the casing by the chamber dividing plate and be installed in each bag chamber that the filter bag on the card constitutes, by the air-purifying chamber that forms between card and the casing top, reach the air inlet duct and the exhaust passage that constitute by the air channel dividing plate, it is characterized in that: in the air-purifying chamber (9) of every row's filter bag top of described each bag chamber, all be arranged with in parallel and the corresponding jet pipe of every row's filter bag (4) (7), the entrance point of jet pipe is connected with the outlet of pulse valve (6); Jet pipe is provided with vertical with jet pipe, identical and concentric nozzle (8) with filter pocket mouths with filter bag quantity; On the casing of top, each bag chamber one side a lift valve (10) with standard-sized sheet and two kinds of duties of semi-closure is set all.

2, a kind of semi-off-line deash bag dust-cleaning equipment according to claim 1 is characterized in that: described lift valve (10) semi-closure duty is the valve closing 1/2-2/3 of lift valve.

3, a kind of semi-off-line deash bag dust-cleaning equipment according to claim 1 is characterized in that: described nozzle (8) to the distance of filter pocket mouths is 75--85mm.

4, a kind of semi-off-line deash bag dust-cleaning equipment according to claim 1 is characterized in that: the bottom of described ash bucket (2) is provided with ash-discharging device (1).

Images