CN219209325U

CN219209325U - Dust removing device of bag type dust collector

Info

Publication number: CN219209325U
Application number: CN202223575587.8U
Authority: CN
Inventors: 王胜; 王文娴; 金煜宸
Original assignee: Wuxi Hongda Environmental Protection Equipment Co ltd
Current assignee: Wuxi Hongda Environmental Protection Equipment Co ltd
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-06-20
Anticipated expiration: 2032-12-31

Abstract

The utility model provides an ash removing device of a bag type dust collector, which comprises an air bag, an injection pipe with an injection port, a pulse valve, a pulse controller and an injection device, wherein the injection device is coaxially arranged with a filter bag of the bag type dust collector and is configured to enable the injection flow of the injection air from the injection port to inject the environmental gas into the ash removing gas of the filter bag in a boundary and same diameter with the filter bag so as to enter the filter bag in a wall attaching mode. Because of the arrangement of the injection device, the injection airflow can obtain a larger jet expansion angle, the injection airflow can be enabled to be attached to the wall just before entering the mouth of the filter bag in a shorter distance, and meanwhile, the airflow speed is continuously reduced from the mouth of the bag to the bottom of the bag, so that the volume of the jet is continuously increased in the process of flushing the jet to the bottom of the bag, the whole filter bag is rapidly expanded, dust is dropped off, but the impact force is gradually reduced to the bottom of the bag, and damage to the filter bag is avoided.

Description

Dust removing device of bag type dust collector

Technical Field

The utility model relates to the technical field of bag dust removal, in particular to a dust removing device of a bag type dust remover.

Background

At present, the long bag dust remover of low pressure is widely used in metallurgical, chemical industry, a plurality of fields such as building materials, and typical ash removal device comprises pulse valve, air pocket, jetting pipe, filter bag, bag cage and pulse controller etc. its theory of operation is: the pulse controller sequentially triggers the pulse valves to enable the compressed gas in the gas bag to be sprayed out of the spraying pipe and to be sprayed to the bottom of the bag through the mouth of the filter bag. When the airflow bottoms out, the airflow rebounds towards the bag mouth, and acts against the airflow entering subsequently to enable the filter bag to expand rapidly, so that dust accumulated on the outer surface of the filter bag is shaken off.

The ash removal device designed according to the principle requires that the distance between the injection pipe and the mouth of the filter bag is short enough and the initial velocity of the injection air flow is high enough, but two problems are caused by the fact that:

1) Because the jet air flow has a entrainment effect on surrounding air (because the distance is short, the jet air flow enters the bag opening and is attached to the wall, the surrounding air in the bag is entrained in the distance, a negative pressure area is formed in the range which is more than 1 meter close to the bag opening, the filter bag is contracted inwards and tightly pressed on a bag cage in the filter bag, when the bottoming rebound air flow reaches the vicinity of the bag opening, the filter bag rapidly expands outwards, the service life of the filter bag is greatly shortened due to repeated extrusion and friction between the filter bag and the bag cage, and when the jetting speed is insufficient, the rebound air flow cannot reach the vicinity of the bag opening and cannot drop dust adsorbed near the bag opening, so that the filtering area of the whole dust remover is actually reduced;

2) In order for the rebounded air flow to reach the vicinity of the mouth from the bottom of the bag, the jet air flow must have sufficient momentum when reaching the bottom of the bag, but the impact of such strong momentum in turn makes the bottom of the filter bag very susceptible to breakage.

Disclosure of Invention

In order to overcome the defects, the utility model provides the ash removing device of the bag type dust collector, which can enable the filter bag to be in an ash shaking state all the time in the process of enabling pulse jet to reach the bottom of the filter bag from top to bottom.

The utility model aims to design a dust removing device of a bag type dust collector, so that the boundary diameter of jet flow (also called jet flow) entering the bag mouth of a filter bag from the dust removing device is approximately equal to the diameter of the bag mouth when the jet flow reaches the vicinity of the bag mouth of the filter bag, the jet flow can attach a wall filter bag at the beginning, the filter bag cannot shrink and expand when the jet flow attaches a wall, a series of reverse eddies are generated in the jet flow due to the action of the inner wall of the filter bag after the jet flow attaches the wall, the jet flow speed is continuously reduced from the bag mouth to the bag bottom, and the influence on the service life of the filter bag caused by the fact that the jet flow forms larger impact on the filter bag when reaching the bag bottom is avoided.

The utility model provides a dust removing device of a bag type dust collector, which comprises an air bag, a blowing pipe with a blowing port, a pulse valve and a pulse controller, and is characterized by also comprising an injection device, wherein the injection device is coaxially arranged with a filter bag of the bag type dust collector and is configured to enable blowing air flow from the blowing port to inject the environmental gas into the filter bag in a boundary and the same diameter as the filter bag so as to enable the environmental gas to enter the filter bag in a wall-attached mode.

In the utility model, because of the arrangement of the injection device, the jet air flow (namely working gas) can obtain a larger jet expansion angle, the jet air flow can roll and absorb the ambient gas to form ash cleaning gas into the filter bag in a shorter distance, and the ash cleaning gas can be attached to the wall at the beginning of entering the mouth of the filter bag, so that dust on the filter bag can be shaken off from the beginning, and because a series of reverse eddies are generated in the air flow in the downward flowing process of the jet air flow, the air flow speed is continuously reduced from the mouth of the filter bag to the bottom of the filter bag, namely, the flow speed of the air flow in front is always lower than the flow speed of the follow-up air flow, so that the volume of the jet air flow is continuously increased in the process of flushing to the bottom of the filter bag, the whole filter bag is rapidly expanded, the dust is dropped off, but the impact force is gradually reduced to the bottom of the filter bag, and damage to the filter bag is avoided.

Further, the injection device comprises a first injection spray pipe and a second injection spray pipe which are coaxially installed, the first injection spray pipe is installed at the injection opening of the injection pipe, and the second injection spray pipe is installed below the first injection spray pipe.

Because the first jet nozzle and the second jet nozzle are arranged, the jet air flow coming out of the jet pipe is ejected twice, so that the dust removing gas boundary diameter is equivalent to the filter bag opening diameter under the condition that the distance between the jet pipe and the filter bag opening is short, the jet flow can be attached to the wall after entering the bag opening, the size of the upper box body of the dust remover is not required to be increased, the manufacturing cost of equipment is not increased, and the improvement of the existing equipment is more facilitated.

Further, the inlet of the second jet nozzle is flush with the outlet of the first jet nozzle.

Through the structure, the jet air flow from the first jet nozzle is enabled to scratch the environmental air and then enters the second jet nozzle.

Still further, above-mentioned bag collector ash removal device still includes dish gas collecting ring, and it installs in the sack department of filter bag, and the second jet nozzle is installed on this dish gas collecting ring through the bracing piece.

Through the setting of dish collection gaseous ring for the air current from the second jet nozzle is rolled up and is absorbed the sack that the environment gas can be better, more be guided into the filter bag, simultaneously, the setting of dish collection gaseous ring can also help the second jet nozzle to install between first jet nozzle and filter bag sack.

Still further, the first jet nozzle is a tapered nozzle with a slot in the trailing edge.

Through the structure, the jet air flow from the first jet nozzle not only has enhanced speed, but also has expanded jet injection angle, and particularly, because the jet air flow has larger pressure difference with surrounding ambient air, when the jet air flow is ejected from a narrow slit (trailing edge slit), a series of flow direction eddies (the direction of the eddies is consistent with the direction of the air flow) can be generated, and the flow direction eddies strengthen entrainment of the jet air flow on surrounding air.

Further, the rear edge of the first jet nozzle is provided with 3-6 narrow slits.

By means of such a narrow slit design, it is possible to increase the gas recirculation, i.e. the entrainment of the jet stream emerging from the first jet nozzle, so that the jet orifice area can be designed to be smaller (e.g. 0.7 to 0.8 times the calculation result provided by the calculation methods provided in the prior art), but a higher entrainment capacity can be achieved, i.e. the gas consumption of such a structure is relatively low.

Still further, the second jet nozzle includes a straight tube section and a lobe nozzle.

Under this kind of structure setting, the straight tube section can be concurrently used as the drainage mixing tube of first jet nozzle, and the structure of lobe nozzle not only helps producing the flow direction vortex, still is favorable to strengthening the mixing between jet air flow and the ambient gas (i.e. main secondary stream), and under the condition of equal exit area, the lobe nozzle still has the characteristics that boundary perimeter increases for stickness shearing between the main secondary stream is mixed the reinforcing. In a word, the second jet nozzle with the structure has strong jet capability and short mixing distance.

Still further, the lobe nozzle has 6 to 12 lobes, each having a divergence angle of 30 ° to 50 °.

Still further, the area ratio of the cross section of the filter bag to the outlet cross section of the lobe nozzle is 3.5-4, and the distance from the lobe nozzle to the bag mouth is 0.4-0.5 of the diameter of the bag mouth.

By this structural arrangement, the jet stream from the second jet nozzle is entrained with ambient gas and enters the mouth of the bag at a boundary commensurate with the diameter of the mouth and is coanda.

Further, the area ratio of the cross section of the straight pipe section to the outlet cross section of the first jet nozzle is 40-50, and the length-diameter ratio of the straight pipe section is 2-3.

Through the structure, the injection ratio can be effectively improved, namely the ratio of the injection air flow to the ambient air is improved, so that the air consumption is low under the condition of the same ash removal effect.

Still further, the second jet nozzle is mounted on the injection tube or is fixed on a bag cage within the filter bag.

The second jet nozzle is arranged in various modes.

These and other aspects of the utility model will be apparent from and elucidated with reference to the embodiments described hereinafter.

Drawings

The construction and further objects and advantages of the present utility model will be better understood from the following description taken in conjunction with the accompanying drawings, wherein like reference numerals identify like elements:

FIG. 1 is a schematic view of a bag house ash removal device according to an embodiment of the utility model;

FIG. 2 is a front view of a first jet nozzle of the ash removal device of the baghouse shown in FIG. 1;

FIG. 3 is a bottom view of the first jet nozzle of FIG. 2;

fig. 4 is a schematic perspective view of a second jet nozzle of the ash removal device of the baghouse shown in fig. 1.

Description of the embodiments

Specific embodiments of the present utility model will be described below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the ash removal device 100 of the bag filter according to one embodiment of the present utility model includes an air bag 1, a blowing pipe 3 having a blowing port 30, a pulse valve 5, a pulse controller 7, a first injection nozzle 8 and a second injection nozzle 9, wherein the first injection nozzle 8 and the second injection nozzle 9 form an injection device. As shown in fig. 1, the first injection nozzle 8 and the second injection nozzle 9 are both disposed coaxially with the filter bag 200 of the bag house (not shown), and are configured to enable the injection of the ambient air from the injection port 30 to form a boundary with the filter bag 200 so as to wall-feed the ash removal gas into the filter bag 200 (the filter bag 200 is mounted on the faceplate 400).

As shown in fig. 1, the first ejector nozzle 8 is installed at the injection port 30 on the injection pipe 3, the second ejector nozzle 9 is installed below the first ejector nozzle 8, and the outlet of the first ejector nozzle 8 and the inlet of the second ejector nozzle 9 are arranged to be flush, and the second ejector nozzle 9 is arranged such that the airflow ejected by the second ejector nozzle is used for sucking the environmental gas to form the ash cleaning gas, and the boundary of the ash cleaning gas is equal to the diameter of the bag port 201 when the ash cleaning gas enters the bag port 201 of the filter bag 200.

As shown in fig. 1, in the present embodiment, the ash removal device 100 for a bag collector further includes a dish-shaped gas collecting ring 6, the dish-shaped gas collecting ring 6 is mounted at a mouth 201 of the filter bag 200, and the second injection nozzle 9 is mounted on the dish-shaped gas collecting ring 6 via the support rod 4.

In this embodiment, as shown in fig. 2 and 3, the first jet nozzle 8 is a tapered nozzle with a slit at the rear edge, and 3 to 6 narrow slits 80 are formed in the rear edge. In the present embodiment, as shown in fig. 1, the first lance 8 is welded to the lance 3. Of course, in other embodiments, the first jet nozzle 8 may also be mounted to the lance 3 by an interference fit or the like.

As shown in fig. 4, in the present embodiment, the second ejector nozzle 9 includes a straight pipe section 90 and a lobe nozzle 92, the lobe nozzle 92 having 6 to 12 lobes 93, the divergence angle α of each lobe 93 being 30 ° to 50 °; the area ratio of the cross section of the filter bag 200 to the outlet cross section of the lobe nozzle 92 is 3.5-4, and the distance between the lobe nozzle 92 and the pocket mouth 201 is 0.4-0.5 of the diameter of the pocket mouth 201; the area ratio of the cross section of the straight pipe section 90 to the outlet cross section of the first jet nozzle 8 is 40 to 50, and the aspect ratio (i.e., the ratio of length to diameter) of the straight pipe section 90 is 2 to 3.

Although in the present embodiment, the second jet nozzle 9 is mounted on the dish-shaped gas collecting ring 6 via the support rod 4, in another embodiment, the second jet nozzle 9 may be mounted on the blowing pipe 3 via, for example, a support frame or a support rod, or may be fixed to the bag cage 203 in the filter bag 200 via an intermediate connector.

In this embodiment, the blowing pipe 3 of the ash removing device 100 of the bag collector is provided with a plurality of blowing openings 30, each blowing opening 30 is provided with an injection device, and each injection device is used for removing ash from a corresponding filter bag 200.

The following describes the operation of the ash removal device 100 of the bag collector according to the present embodiment with reference to fig. 1 to 4:

under the triggering of the pulse controller 7, the pulse valve 5 is opened, and the compressed gas in the air bag 1, namely the jet air flow, instantaneously enters the jet pipe 3 and is jetted out from each jet opening 30 of the jet pipe 3;

the jet air flow in the jet pipe 3 enters the first jet nozzle 8 through the jet opening 30, the jet air flow sprayed through the first jet nozzle 8 is downwards curled to absorb peripheral air and enters the straight pipe 92 of the second jet nozzle 9 together, and the peripheral air and the jet air are mixed in the straight pipe 92;

the mixed air flow enters the lobe nozzle 92 from the straight pipe 92, and is ejected from the lobe nozzle 92, the ejected air flow ejected twice through the second ejection jet pipe 9 is rapidly expanded, and one path of the ejected air flow is downwards and simultaneously catches surrounding environmental gas to form ash cleaning gas, and the ash cleaning gas enters the bag mouth 201 of the filter bag 200 through the disc-shaped gas collecting ring 6;

the jet air flow is attached to the wall at the beginning of entering the bag mouth 201, and directly reaches the bag bottom from the bag mouth 201, and in the process that the jet flow flows from the bag mouth 201 to the bag bottom at high speed in the filter bag 200, the front jet flow gradually slows down due to the continuous speed reduction, pressure boost and aggregation of the jet flow under the action of the inner wall of the filter bag 200, the subsequent air continuously moves downwards under the action of inertia, the filter bag is quickly expanded under the interaction of the air, and dust adsorbed by the outer wall of the filter bag 200 is shaken off, so that the dust cleaning process is completed once.

In the above embodiment of the present utility model, since the jet air flows out of the second jet nozzle 9 and the ambient air is sucked and attached to the filter bag 200 from the beginning, the filter bag 200 is not excessively strong or weak by a certain section of air flow, and the filter bag 200 is not contracted and expanded due to the change of the acting direction of the air flow, which not only enhances the ash removing capability, but also prolongs the service life of the filter bag. In addition, due to the arrangement of the injection device, the size of the dust collector box body does not need to be increased, so that the manufacturing cost of equipment cannot be increased additionally due to the need of increasing the size of the dust collector box body, and the improvement and production of the existing equipment are facilitated.

While the technical content and features of the present utility model have been disclosed above, it will be understood that various changes and modifications to the above-described structure, including combinations of technical features individually disclosed or claimed herein, and other combinations of these features as apparent to those skilled in the art may be made under the inventive concept of the present utility model. Such variations and/or combinations fall within the technical field to which the utility model relates and fall within the scope of the claims of the utility model.

Claims

1. The dust removing device of the bag type dust collector comprises an air bag, a blowing pipe with a blowing port, a pulse valve and a pulse controller, and is characterized by further comprising an injection device, wherein the injection device is coaxially arranged with a filter bag of the bag type dust collector and is configured to enable blowing air flow from the blowing port to inject dust removing gas entering the filter bag in a wall-attached mode by forming a boundary with the same diameter of the filter bag.

2. The ash removal device of a bag filter as defined in claim 1, wherein the injection device comprises a first injection nozzle and a second injection nozzle coaxially mounted, the first injection nozzle being mounted on the injection pipe at the injection port, the second injection nozzle being mounted below the first injection nozzle.

3. The baghouse ash handling device of claim 2 wherein the inlet of the second jet nozzle is flush with the outlet of the first jet nozzle.

4. The ash removal device of a bag house as defined in claim 3, further comprising a dished gas collecting ring mounted at the mouth of said filter bag, said second jet nozzle being mounted to said dished gas collecting ring via a support rod.

5. The ash removal apparatus as set forth in claim 2, 3 or 4, wherein said first ejector nozzle is a tapered nozzle with a slit at the trailing edge.

6. The ash removal device of a bag filter as defined in claim 5, wherein the rear edge of the first jet nozzle is provided with 3-6 slots.

7. The baghouse ash handling device as defined in claim 4 wherein said second ejector nozzle includes a straight pipe section and a lobe nozzle.

8. The baghouse ash removal device as set forth in claim 7, wherein said lobe nozzle has 6 to 12 lobes each having a divergence angle of 30 ° to 50 °.

9. The ash removal device of a bag house as set forth in claim 8, wherein the area ratio of the cross section of the filter bag to the outlet cross section of the lobe nozzle is 3.5-4, and the distance of the lobe nozzle from the mouth is 0.4-0.5 of the diameter of the mouth.

10. The ash removal device of bag house dust collector as set forth in claim 9, wherein the area ratio of the cross section of said straight tube section to the outlet cross section of said first ejector nozzle is 40-50, and the aspect ratio of said straight tube section is 2-3.