CN201140008Y - Positive pressure reverse suction bag filter - Google Patents

Abstract

The utility model provides a positive pressure reverse suction bag type dust collector. Including the body, filter bag, dust-containing fan, uniform air reducer, ash hopper and ash conveying pipe; several filter bags are installed in each filter chamber above the body, a chimney is arranged above the filter chamber, and a chimney is installed below the filter chamber. Ash hopper, the lower end of the ash hopper is provided with an ash unloader and connected with the ash conveying pipeline; the uniform air variable diameter pipe is connected with the ash hopper through the air inlet valve; the uniform air variable diameter pipe is connected with the outlet of the dust fan; The variable diameter pipe is connected with the reverse suction pipe through the branch pipe and the reverse suction valve; the reverse suction pipe is directly connected with the inlet of the dust-containing fan. A secondary ash hopper containing a material level gauge is arranged between the ash hopper and the ash conveying pipeline, and the lower end of the secondary ash hopper is connected with the ash conveying pipeline through a gate valve. The utility model has the advantages of reasonable structure, easy manufacture, thorough ash cleaning, avoiding secondary adsorption, reduced running resistance, low running cost, good air lock effect, avoiding secondary dust, and is especially suitable for collecting fine dust with light specific gravity.

Description

Positive pressure reverse suction bag filter

Technical field

The utility model relates to a dust removal device, in particular to a positive pressure reverse suction bag type dust collector.

Background technique

At present, the positive pressure reverse suction dust collector is mainly used in the dust control work of the flue gas generated by submerged arc furnace smelting, and recovers the oxidized dust with economic value in the flue gas. The existing positive pressure reverse suction dust collector generally adopts a structure in which a dust-containing fan is blown in front of the dust collector, and a reverse suction fan is supplemented by a reverse suction fan at the back to blow back the airflow into the dust collector again. However, the anti-suction fan is not only vulnerable during operation, but also increases the operating cost; moreover, due to the strong adhesion of oxidation dust in the flue gas produced by submerged arc furnace smelting, the existing positive pressure anti-suction bag type dust collector The device belongs to the form of weak wind dust removal, and the back suction air cannot completely suck down the dust on the surface of the filter bag, and these oxidized dusts are fine and light in specific gravity, and are not easy to settle for a long time. When the dust in the filter bag is still floating in the air, The new filtering process has started, and the dust floating in the air is re-adsorbed to the surface of the filter bag by the filtered airflow, forming a secondary adsorption phenomenon, which is not conducive to the cleaning of the filter bag, resulting in the resistance of the dust collector after running for a period of time increase, does not function properly. In addition, the discharge valves used in the ash hopper ash discharge port of the existing positive pressure reverse suction bag filter are usually single-stage electric ash unloaders and pneumatic flap valves. The disadvantage of not being able to lock the wind; some use single-connected flap valves, double-connected hammer flap valves, etc., such unloading devices have valve plates that cannot be completely sealed, especially when the positive pressure reverse suction dust collector is in the positive position. In the state of high pressure operation, its sealing performance is even worse, so that it is difficult to guarantee the air lock effect, causing part of the dust-laden gas to be ejected from the ash discharge port, resulting in secondary dust.

Utility model content

In order to overcome the deficiencies of the prior art, the utility model provides a positive-pressure reverse air filter that cleans thoroughly, avoids secondary adsorption, has small running resistance, low running cost, and small air leakage coefficient, and is suitable for collecting fine dust with light specific gravity. Suction bag filter.

The technical solution adopted by the utility model to solve the technical problem is: including the body, filter bag, dust-containing fan, uniform wind variable diameter pipe, ash bucket and ash conveying pipeline; each filter chamber above the body is provided with several filter bags to filter There is a chimney above the filter chamber, an ash hopper below the filter chamber, and an ash unloader at the lower end of the ash hopper, which is connected with the ash conveying pipeline; The variable-diameter pipe is connected with the outlet of the dust-containing fan; the air-uniform variable-diameter pipe is connected with the reverse-suction pipe through the branch pipe and the anti-suction valve; the feature is that the anti-suction pipe is directly connected with the inlet of the dust-containing fan. In this way, the reverse suction fan used for high-pressure reverse suction in the existing similar dust collectors is cancelled, thereby reducing operating power and operating costs, and reducing operating equipment and loss parts. When the air inlet valve of the dust collector is closed and the back suction valve is opened, the filter chamber realizes back suction and dust removal through the back suction air pipe and the negative pressure of the dust-containing fan, and can make the dust suspended in the air fall to the air as soon as possible. In the ash hopper, the generation of secondary adsorption is avoided, and the ash cleaning is more thorough.

In order to solve the air leakage problem at the bottom of the ash hopper, there is a secondary ash hopper between the ash hopper and the ash conveying pipeline, a material level gauge is installed in the secondary ash hopper, and the lower end of the secondary ash hopper is conveyed to the ash through the gate valve. pipes connected. Under normal conditions, the gate valve is closed, and the ash collected in the ash hopper first enters the secondary ash hopper for storage. The gate valve at the lower end of the ash hopper, and start the ash conveying pipeline. In this way, when the unloading valve is unloading the ash, the gate valve below is in a completely closed state, and with the help of the settled dust, the purpose of completely locking the air is realized, and the secondary dust is avoided.

The beneficial effects of the utility model are: reasonable structure, easy manufacture, thorough dust removal, avoiding secondary adsorption, reduced running resistance and low running cost, good wind locking effect, avoiding secondary dust, especially suitable for fine, specific gravity Light dust collection.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the right side view of Fig. 1 .

In the figure: 1 is the dust-containing fan, 2 is the anti-suction air pipe, 3 is the uniform air reducing pipe, 4 is the flower plate, 5 is the filter bag, 6 is the chimney, 7 is the deflector, 8 is the air inlet valve, 9 is the anti-suction valve, 10 is the ash hopper, 11 is the unloader, 12 is the secondary ash hopper, 13 is the ash conveying pipe, 14 is the material level meter, 15 is the body, 16 is the filter chamber, 17 is the sub-unit Fork pipe, 18 are gate valves.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

The utility model mainly includes a body 16, a filter bag 5, a dust-containing fan 1, an air uniform variable diameter pipe 3, an ash hopper 10, a secondary ash hopper 12 and an ash conveying pipeline 13; There are several filter bags 5, a chimney 6 is arranged above the filter chamber 16, an ash hopper 10 is arranged below the filter chamber 16, and an ash unloader 11 is arranged at the lower end of the ash hopper 10. The uniform air reducing pipe 3 is connected to the ash hopper 10 through the air inlet valve 8; the uniform air reducing pipe 3 is connected to the outlet of the dust-containing fan 1; It is connected with the suction pipe 2. The air uniform reducing pipe 3 is connected with the outlet of the dust-containing fan 1; the bifurcated pipe 17 is connected with the reverse-suction pipe 2 through the anti-suction valve 9; the anti-suction pipe 2 is directly connected with the inlet of the dust-containing fan 1. A secondary ash hopper 12 is provided at the lower end of the ash hopper 10, and a material level gauge 14 is arranged in the secondary ash hopper 12, and the lower end of the secondary ash hopper 14 is connected with the ash conveying pipeline 13 through a gate valve 18.

During work, the dust-laden gas from the polluted air source is introduced by the dust-laden fan 1 through the pipeline, blown into the air-balancing variable-diameter tube 3 for air-balancing treatment under the action of the dust-laden fan 1, and enters the dust through the air inlet valve 8. The bucket 10, under the action of the deflector 7, the dust-laden air flow enters each filter bag 5 evenly, and penetrates the filter bag 5 from the inside to the outside, the dust is blocked on the inner surface of the filter bag 5, and the purified gas flows from the top. Chimney 6 discharges. As the filtering conditions continue, the dust on the inner surface of the filter bag 5 accumulates more and more, and the operating resistance of the equipment gradually increases. In order to ensure the normal operation of the system, the upper limit of the resistance of the dust collector is usually maintained at 1200-1600Pa. Within this limited range, carry out back suction cleaning. First close the air inlet valve 8 and open the back suction valve 9 at the same time. At this time, the filter bag 5 shrinks and deforms due to the negative pressure provided by the dust fan 1 and the back suction air pipe 2, and part of the dust is separated from the inner surface of the filter bag 5. Settling under the action of the back-suction airflow, but due to insufficient cleaning power, the filter bag 5 only shrinks and deforms, and at this time a lot of dust cannot leave the filter bag 5; after 10 seconds, the back-suction valve 9 is closed, The air inlet valve 8 is opened again, and the positive pressure dust-laden gas immediately bulges up the filter bag 5 again. When the filter bag 5 bulges up instantly, due to the reverse force, the dust on the filter bag 5 is completely separated from the surface of the filter bag 5 . Then the air inlet valve 8 is closed, and the anti-suction air valve 9 is opened to perform back-suction cleaning for the second time. At this time, the dust detached from the surface of the filter bag 5 enters the ash hopper 10 to settle down with the back-suction air flow. After tens of seconds, the anti-suction valve 9 is closed, and the filter chamber 16 realizes sedimentation and dust removal in a static state. After a certain period of time, the air inlet valve 8 is opened, and the filter chamber 16 returns to the filtering state, and enters the next unit for further cleaning. Dust removal, in this way, the dust is removed room by room. The dust cleared by the filter bag 5 falls into the ash hopper 10, and the unloader 11 (rigid impeller feeder) at the lower end of the ash hopper 10 keeps running to send the collected ash into the secondary ash hopper 12. A rapper is provided on the outer side of the ash hopper 10, and rapping is performed at regular intervals to assist ash discharge. When the dust in the secondary ash hopper 12 reaches a certain height, the material level gauge 14 immediately sends a signal to open the gate valve 18, and starts the ash conveying pipeline 13, and sends the dust to a designated place for packaging.

Claims (2)

1, malleation back suction wind sleeve formula deduster comprises body, filter bag, dust-laden blower fan, equal wind reducer pipe, ash bucket and grey material conveying tube road; Be provided with several filter bags in each filter chamber of body top, the top of filter chamber is provided with chimney, and the below of filter chamber is provided with ash bucket, and the lower end of ash bucket is provided with discharge apparatus and links to each other with grey material conveying tube road; All the wind reducer pipe interlinks through air intake valve and ash bucket; All the wind reducer pipe links to each other with the outlet of dust-laden blower fan; All the wind reducer pipe links to each other with the back suction airduct through bifurcated pipe, back suction air-valve; It is characterized in that: the back suction airduct directly links to each other with the import of dust-laden blower fan.

2, malleation back suction wind sleeve formula deduster according to claim 1, it is characterized in that: be provided with the secondary ash bucket between ash bucket and grey material conveying tube road, be provided with level-sensing device in the secondary ash bucket, the lower end of secondary ash bucket links to each other with grey material conveying tube road through slide valve.