Airflow diffusion structure of bag-type dust collector

Abstract

The utility model relates to the technical field of dust removers, in particular to an airflow diffusion structure of a bag-type dust remover, which comprises an airflow diffusion box and an air inlet channel with a wedge-shaped structure, the bottom surface of the air inlet channel is open, the airflow diffusion box is integrally L-shaped, two ends of the airflow diffusion box are open, an L-shaped channel is formed in the airflow diffusion box, one end of the airflow diffusion box is provided with an air inlet, and the other end of the airflow diffusion box is connected with the air inlet channel; the bag-type dust collector has the advantages that the structure is reasonable and simple, the production cost is low, the installation and the use are convenient, the air inlet energy of the air inlet channel can be effectively reduced under the condition that the air inlet resistance is not improved, the invalid air flow in the bag-type dust collector is reduced, and the dust collection efficiency is improved. Impact and abrasion of airflow to the cloth bag are effectively weakened, so that the service life of the cloth bag is prolonged, and meanwhile, the dust falling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dust collectors, in particular to an airflow diffusion structure of a bag dust collector. Background Art

[0002] At present, most bag filter designs mainly consider optimizing the flow field by evenly distributing the intake air, but do not consider the effect of the kinetic energy of the dust-laden gas in the box on the flow rate and concentration of the dust-laden gas from an energy perspective. Dust-laden gas with excessively high flow velocity will cause the bags in local areas to be severely impacted, shortening the life of the bags, while a reasonable gas movement velocity will extend the service life of the bags and reduce the frequency of bag replacement.

[0003] The existing publication number: CN117282180A "Pulse bag dust collector air intake device based on intake kinetic energy dissipation" effectively solves the above problems, but it is found during use that the device is mainly used for working conditions with a large number of large-size particles, and has relatively complex structures such as a particle pre-separation device, an airflow diffusion box, and a wedge-shaped air inlet duct arc guide plate. When the structure is used for working conditions with small-size particles (below 200μm), it cannot play the best effect: the particle pre-separation device cannot play a full role and will damage the uniformity of the diffusion flow field. Therefore, the air inlet duct in the device must be provided with a highly adjustable guide plate, and the guide plate position is adjusted according to the difference in the intake speed to achieve a reasonable distribution of the airflow. This complex structure is very necessary in the case of a high content of large-size particles, but in the working condition of small-size particles, it will greatly increase the equipment cost. To this end, a bag dust collector airflow diffusion structure for working conditions with small-size particles (below 200μm) is provided. Utility Model Content

[0004] The utility model aims to solve the above problems, thereby providing an airflow diffusion structure for a bag dust collector.

[0005] The utility model solves the above problems and adopts the following technical solutions:

[0006] An airflow diffusion structure for a bag dust collector comprises an airflow diffusion box and an air inlet duct of a wedge-shaped structure with an opening on the bottom. The airflow diffusion box is L-shaped as a whole, with open structures at both ends and an L-shaped channel formed inside. An air inlet is provided at one end of the airflow diffusion box, and the other end is connected to the air inlet duct; a diversion component is provided in the airflow diffusion box to divert the dust-containing gas flowing in from the air inlet.

[0007] Compared with the prior art, the utility model adopting the above technical solution has the following outstanding features:

[0008] The utility model has a reasonable and simple structure, low production cost, and is easy to install and use. It can effectively reduce the intake energy of the air inlet duct without increasing the intake resistance, reduce the invalid gas flow inside the bag dust collector, and effectively weaken the impact and wear of the airflow on the bag, thereby increasing the life of the bag and improving the dust removal efficiency. The dust-containing gas first enters the airflow diffusion box from the air inlet, then enters the air inlet duct, and finally enters the bag dust collector. The flow direction of the gas flowing into the airflow diffusion box from the air inlet pipe is perpendicular to the flow direction of the gas flowing into the air inlet duct from the airflow diffusion box, which prompts the airflow to turn. After the turned airflow is dispersed into the wedge-shaped air inlet duct, a vortex motion is formed in the air inlet duct, thereby realizing the consumption of intake energy, significantly reducing the invalid gas flow flowing into the ash hopper, reducing the impact of the airflow on the bag, and avoiding dust in the ash hopper of the bag dust collector.

[0009] As a preferred embodiment, a further technical solution of the utility model is:

[0010] The diversion assembly includes a first guide plate and a second guide plate. The first guide plate is located on the center line of the airflow diffusion box and runs through the entire airflow diffusion box channel, dividing the internal channel of the airflow diffusion box into two. The second guide plate is located on the center line of the air inlet and divides the air inlet into two. The first guide plate and the second guide plate are seamlessly connected, dividing the airflow diffusion box into two independent left and right channels that are not connected to each other; the dust-containing gas is diverted, and the diverted gas can be dispersed in the air inlet and form countless vortex flows, which can achieve effective kinetic energy dissipation in the air inlet.

[0011] The air inlet is trumpet-shaped, and the opening size of the larger opening end is adapted to the channel size of the air flow diffusion box; the streamline of the dust-containing gas at the air inlet is trumpet-shaped and evenly diffused, thereby reducing the gas flow rate.

[0012] The internal L-shaped channel corner of the airflow diffusion box is an arc-shaped corner, which is conducive to the turning of dust-laden gas and can prevent dust accumulation at the corner. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the main structure of the utility model.

[0014] Figure 2 This is a schematic diagram of the structure of the airflow diffusion box of the utility model.

[0015] Figure 3 It is an exploded view of the diversion component of the utility model.

[0016] Figure 4 The utility model is a schematic diagram of a bag dust collector equipped with an air flow diffusion box.

[0017] Figure 5 This is the trace diagram of the bag dust collector without airflow diffusion box.

[0018] Figure 6 This is the trace diagram of the bag filter with air flow diffusion box.

[0019] Figure 7 This is the total pressure cloud diagram of the bag dust collector without airflow diffusion box.

[0020] Figure 8 This is the total pressure cloud diagram of the bag dust collector with an air flow diffusion box.

[0021] Fig. 9 This is the velocity cloud diagram of the bag dust collector box and ash hopper cross section without airflow diffusion box.

[0022] Fig.10 This is a velocity cloud diagram of the bag dust collector box and ash hopper cross section with an air flow diffusion box.

[0023] Fig.11 This is a graph showing the percentage of dust particles of different sizes settling in the ash hopper of a bag dust collector with and without an airflow diffusion box.

[0024] Marked in the figure are: air flow diffusion box 1, air inlet 2, air inlet duct 3, first guide plate 4, second guide plate 5. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0026] See also Figure 1-Figure 4 A bag dust collector airflow diffusion structure includes an airflow diffusion box 1 and an air inlet duct 3 with a wedge-shaped structure and an opening on the bottom. The airflow diffusion box 1 is L-shaped as a whole, with open structures at both ends and an L-shaped channel formed inside. An air inlet 2 is provided at one end of the airflow diffusion box 1, and the other end is connected to the air inlet duct 3; a diversion component is provided in the airflow diffusion box 1 to divert the dust-containing gas flowing in from the air inlet 2.

[0027] The diversion assembly includes a first guide plate 4 and a second guide plate 5. The first guide plate 4 is located on the center line of the airflow diffusion box 1 and runs through the entire channel of the airflow diffusion box 1, dividing the internal channel of the airflow diffusion box 1 into two. The second guide plate 5 is located on the center line of the air inlet 2 and divides the air inlet 2 into two. The first guide plate 4 and the second guide plate 5 are seamlessly connected, dividing the airflow diffusion box 1 into two independent left and right channels that are not connected to each other; the dust-containing gas is diverted, and the diverted gas can be dispersed in the air inlet 3 and form countless vortex flows, which can achieve effective kinetic energy dissipation in the air inlet 3.

[0028] The air inlet 2 is trumpet-shaped, and the opening size of the larger opening end is adapted to the channel size of the air flow diffusion box 1; the streamline of the dust-containing gas at the air inlet 2 is trumpet-shaped and evenly diffused, reducing the gas flow rate.

[0029] The corner of the L-shaped channel inside the airflow diffusion box 1 is an arc-shaped corner, which is beneficial to the turning of the dust-containing gas and can reduce the impact effect of the airflow on the corner.

[0030] See also Figure 5-Figure 6 , Figure 5 This is a trace diagram of a bag filter without an airflow diffusion box. The dusty gas at the inlet hits the partition, moves parallel to the partition and hits the side wall of the hopper. In the jet channel, the high-speed dusty gas consumes less kinetic energy, but the kinetic energy of the dusty gas is still high. Part of the dusty gas turns to the bag area, gradually consuming kinetic energy and causing bag wear; the other part of the gas flows downward into the hopper, forming a vortex, making it difficult for dust particles to settle.

[0031] Figure 6 This is the trace diagram of the bag dust collector equipped with an airflow diffusion box. The inlet dust-containing gas is diverted by the first guide plate and the second guide plate in the airflow diffusion box, and two airflows are formed on both sides of the guide plate. Then they flow forward respectively and turn under the guidance of the arc corner, and then the dust-containing gas is dispersedly diffused into the wedge-shaped air inlet duct; the dust-containing gas dispersed into the wedge-shaped air inlet duct forms a vortex motion in the air inlet duct, which can consume a large amount of intake kinetic energy and reduce the kinetic energy of the dust-containing gas; then the dust-containing gas is diffused into the ash hopper at a low speed and evenly, and the invalid gas flow is significantly reduced.

[0032] See also Figure 7-Figure 8 , which are the total pressure cloud diagrams of bag dust collectors with and without air diffusion boxes. The total pressure difference of the bag dust collector without air diffusion box is 1279.2Pa; the total pressure difference of the bag dust collector with air diffusion box is 1237.9Pa. It can be seen that the bag dust collector equipped with air diffusion box can not only improve the performance of the dust collector, but also reduce the resistance of the equipment.

[0033] See also Figure 9-10 , Fig. 9The velocity cloud diagram of the bag filter box and the ash hopper without air diffusion box. Sections (a) to (b) show the velocity cloud diagram of the box. It can be observed that the air velocity around the bag is high in the left and rear areas of the box, and the air velocity near the bottom of the bag is even higher. The maximum air velocity at the bottom of the box is 22.3 m·s-1, and the maximum air velocity at the top is 9.1 m·s-1. The high-speed airflow has a large scouring effect on the filter bag, which seriously affects the service life of the filter bag. Sections (c) to (d) show the velocity cloud diagram of the ash hopper. The high-speed airflow is mainly distributed in the left and rear areas of the ash hopper. The maximum air velocity at the top is 21.8 m·s-1, and the maximum air velocity in the local area at the bottom is 17.4 m·s-1. The existence of high-speed airflow is not conducive to the sedimentation of dust and is prone to secondary dust.

[0034] Fig.10 The velocity cloud diagram of the cross section of the bag dust collector box and the ash hopper with an air flow diffusion box. Sections (a) to (b) show the cross-sectional velocity cloud diagram of the box. It can be observed that the maximum airflow velocity at the bottom of the box is 6.1 m·s-1, and the top is 3.1 m·s-1. Compared with the bag dust collector without a diffusion box, the maximum airflow velocity in the box is reduced by nearly 1 / 3, and the airflow distribution is more uniform, which effectively extends the service life of the filter bag. Sections (c) to (d) show the cross-sectional velocity cloud diagram of the ash hopper. The maximum airflow velocity at the top of the ash hopper is 12.9 m·s-1, and the bottom is only 3.2 m·s-1. This shows that the early consumption of the intake kinetic energy reduces the kinetic energy in the ash hopper, which is conducive to the sedimentation of dust particles and reduces the generation of secondary dust.

[0035] See also Fig.11 , is the proportion of dust particles of different sizes settling in the ash hopper of the bag dust collector with or without an airflow diffusion box. The sedimentation ratio of 25 μm and 50 μm dust particles is not significantly improved, but the sedimentation of 75 μm, 100 μm, 150 μm, and 200 μm dust particles in the ash hopper increased by 13.9%, 32.1%, 60.2%, and 66.5%, respectively. This shows that the intake kinetic energy is consumed in large quantities before the ash hopper, and the ineffective flow and kinetic energy of the gas after flowing into the ash hopper are reduced, which improves the sedimentation capacity of the dust particles. At the same time, it also improves the sedimentation capacity of the dust particles that are captured, agglomerated, and cleaned after being captured by the bag. It can be seen that the reasonable consumption of intake kinetic energy is conducive to the sedimentation of dust particles, reduces the number of pulse injections, and prolongs the service life of the bag.

[0036] Therefore, when the utility model is used, without increasing the air intake resistance, the dust-containing gas first enters the airflow diffusion box from the air intake port, then enters the air intake duct, and finally enters the bag dust collector. The flow direction of the gas flowing from the air intake duct into the airflow diffusion box is perpendicular to the flow direction of the gas flowing from the airflow diffusion box into the air intake duct, which promotes the airflow to turn. After the turned airflow is dispersed into the wedge-shaped air intake duct, a vortex motion is formed in the air intake duct, thereby realizing the consumption of air intake energy, significantly reducing the ineffective gas flow flowing into the ash hopper, reducing the impact of the airflow on the bag, and avoiding dust in the ash hopper of the bag dust collector.

[0037] The utility model has a reasonable and simple structure, low production cost, and is easy to install and use. It can effectively reduce the intake energy of the intake duct without increasing the intake resistance, reduce the ineffective gas flow inside the bag dust collector, and effectively weaken the impact and wear of the airflow on the bag, thereby increasing the life of the bag and improving the dust removal efficiency.

[0038] The above description is only a preferred feasible embodiment of the present utility model, and does not limit the scope of rights of the present utility model. All equivalent changes made using the contents of the present utility model specification and its drawings are included in the scope of rights of the present utility model.

Claims

1. An airflow diffusion structure for a bag filter, comprising an airflow diffusion box and an air inlet duct of a wedge-shaped structure with an opening on the bottom surface, characterized in that: The air flow diffusion box is L-shaped as a whole, with open structures at both ends and an L-shaped channel formed inside. An air inlet is provided at one end of the air flow diffusion box, and the other end is connected to the air inlet duct; a diversion component is provided in the air flow diffusion box to divert the dust-containing gas flowing in from the air inlet.

2. The airflow diffusion structure of a bag filter according to claim 1 is characterized in that: The diversion assembly includes a first guide plate and a second guide plate. The first guide plate is located on the center line of the airflow diffusion box and runs through the entire airflow diffusion box channel, dividing the internal channel of the airflow diffusion box into two. The second guide plate is located on the center line of the air inlet and divides the air inlet into two. The first guide plate and the second guide plate are seamlessly connected, dividing the airflow diffusion box into two independent channels on the left and right that are not connected to each other.

3. The airflow diffusion structure of a bag filter according to claim 1 is characterized in that: The air inlet is trumpet-shaped, and the opening size of the larger opening end is adapted to the channel size of the airflow diffusion box.

4. The airflow diffusion structure of a bag filter according to claim 1 is characterized in that: The internal L-shaped channel corner of the airflow diffusion box is a curved corner.

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