Baghouse dust collectors that reduce clogging

Abstract

This utility model provides a bag filter dust collector that reduces clogging. The technical solution is as follows: it includes a housing, with an air inlet at the lower part of the side wall and an air outlet at the upper part of the side wall. A bag fixing plate is also fixed inside, with several through holes on the fixing plate. A first bag group, a second bag group, and a third bag group are sequentially arranged in these through holes according to the air inlet direction. The first and third bag groups are symmetrically arranged along the centerline of the air inlet direction, with Y rows and X bags per row. The second bag group has 2Y rows, with X+2 bags per row, where Y is a positive integer greater than or equal to 3 and less than or equal to 8, and X is a positive integer greater than or equal to 4 and less than or equal to 6. The beneficial effects of this utility model are: (1) significantly reduced clogging frequency; (2) significantly reduced labor intensity; (3) improved equipment operating efficiency; (4) more uniform airflow distribution; (5) extended bag lifespan; and (6) optimized energy consumption.

Description

Technical Field

[0001] This utility model belongs to the technical field of baghouse dust collectors, and particularly relates to a baghouse dust collector that reduces the probability of clogging. Background Technology

[0002] In the drying process of sodium hypophosphite production, the bag filter originally used a structure with the same number of filters in each row, but the following problems exist in actual operation: (1) Frequent blockage at the air inlet: The front row of cloth bags is directly subjected to the impact of high-speed airflow, and dust accumulates quickly. It needs to be cleaned 2-3 times a day, and each cleaning takes 20 minutes. (2) Clogging of the tail bag: When the airflow reaches the tail, the speed decreases and dust accumulation causes the tail bag to become clogged 1-2 times a week, requiring the machine to be stopped for unclogging. (3) Limitations of traditional improvements: Simply reducing the number of bags at the air inlet will cause turbulent airflow at the tail end, and simply increasing the number of bags in the middle cannot balance the pressure difference at both ends. Summary of the Invention

[0003] To address the frequent bag clogging problem in the existing technology, this utility model provides a bag filter dust collector that reduces clogging. The technical solution includes a housing with an air inlet at the lower part of the side wall and an air outlet at the upper part of the side wall. A bag fixing plate is also fixed inside the housing, and the bag fixing plate has several through holes. A first bag group, a second bag group, and a third bag group are sequentially arranged in these through holes according to the air inlet direction. The first and third bag groups are symmetrically arranged along the centerline of the air inlet direction, with Y rows and X bags per row. The second bag group has 2Y rows and X+2 bags per row, where Y is a positive integer greater than or equal to 3 and less than or equal to 8, and X is a positive integer greater than or equal to 4 and less than or equal to 6.

[0004] In a preferred embodiment, the spacing between the rows of the first bag group along the air intake direction decreases sequentially, and the decrease difference is the same. The minimum row spacing is 150mm, and the spacing between the last row of the first bag group and the second bag group is the minimum spacing minus 30mm.

[0005] In a more preferred embodiment, the spacing between rows of the second bag assembly is the minimum spacing minus 30mm.

[0006] In a preferred embodiment, the bag fixing plate is provided with several pulse air pipes above it, and several pulse nozzles are provided on the pulse air pipes. The jet direction of the pulse nozzles is directly facing the bag openings of the first bag group, the second bag group, and the third bag group.

[0007] In a preferred embodiment, the bottom of the shell is fixedly connected to the ash collection hopper.

[0008] In a preferred embodiment, the bags in the first and third bag groups are made of antistatic polypropylene needle-punched felt, with a nano-coating treatment on the surface and a pore size of 1-3μm.

[0009] In a more preferred embodiment, the nano-coating is one of fluorosilane-coated multi-walled carbon nanotubes, fluorosilane-modified nano-SiO2, or perfluoroalkyl-modified PTFE nanoparticles.

[0010] In a preferred embodiment, the bags in the second bag group are made of polyester fiber needle-punched felt with a pore size of 1-3 μm.

[0011] The beneficial effects of this utility model are: (1) Significantly reduced clogging frequency: By reducing the number of bags at the air inlet and tail, and optimizing the airflow distribution, the problem of dust accumulation caused by airflow impact and retention at both ends of the traditional dust collector was solved. The clogging frequency at the air inlet was reduced from 2-3 times a day to less than once a week, and the clogging frequency at the tail was reduced from 1-2 times a week to less than once a month. The overall clogging probability was reduced by more than 90%. (2) Significantly reduced labor intensity: The frequency of manual cleaning and bag replacement has been reduced, and the time for a single maintenance has been shortened from the traditional 1-2 hours to within 30 minutes, which can save a lot of labor costs every year and reduce labor intensity by about 70%; (3) Improved equipment operating efficiency: Reduced downtime due to blockage, extended continuous operating time of equipment, and increased production efficiency by 15%-25%, especially suitable for continuous drying production of chemical products such as sodium hypophosphite; (4) More uniform airflow distribution: The gradual spacing design and symmetrical layout make the airflow pass through the middle filter bag evenly in the dust collector, avoid excessive local load, improve the overall filtration efficiency, and keep the dust recovery rate above 99.5%; (5) Extended service life of the filter bag: Differentiated material configuration (wear-resistant and hydrophobic materials are used at the air inlet and tail) reduces dust adhesion and wear, extending the filter bag replacement cycle from 6 months to more than 1 year, and reducing maintenance costs by more than 50%. (6) Energy consumption optimization: By optimizing the airflow path, the airflow resistance is reduced, and the energy consumption of the equipment is reduced by 10%-20% compared with the traditional structure, which meets the requirements of energy-saving production. Attached Figure Description

[0012] Figure 1 This is a front view of the present invention.

[0013] Figure 2 This is a top sectional view of the bag assembly in this utility model.

[0014] In the diagram: 1. Shell; 2. Air inlet; 3. Air outlet; 4. First bag assembly; 5. Second bag assembly; 6. Third bag assembly; 7. Ash collection hopper; 8. Pulse air pipe; 9. Pulse nozzle; 10. Bag fixing plate. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Example like Figure 1-2 The bag filter dust collector shown includes a housing 1. An air inlet 2 is provided on the lower part of the side wall of the housing 1, and an air outlet 3 is provided on the upper part of the side wall. A bag fixing plate 10 is also fixed inside. The bag fixing plate 10 has several through holes. A first bag group 4, a second bag group 5, and a third bag group 6 are arranged in sequence on these through holes according to the air inlet direction. The first bag group 4 and the third bag group 6 are symmetrically arranged along the center line of the air inlet direction, with 3 rows and 4 bags in each row. The second bag group 5 has 6 rows and 6 bags in each row.

[0017] Furthermore, the distance between the first row of bags and the second row of bags in the first bag group 4 is L1, where L1 is 180mm; the distance between the second row of bags and the third row of bags is L2, where L2 is 150mm; and the distance between the third row of bags and the second bag group 5 is L3, where L3 is 120mm. The first bag group 4 at the air inlet reduces the impact of high-speed airflow on the bags by expanding the initial buffer space. The third bag group 6 at the air outlet gradually changes in the opposite direction to increase the airflow discharge speed and reduce tail stagnation.

[0018] Furthermore, the spacing between rows of the second bag group 5 is L3, where L3 is 120mm. The even distribution of the second bag group 5 ensures uniform airflow and avoids local dust accumulation.

[0019] Furthermore, a plurality of pulse air pipes 8 are provided above the bag fixing plate 10, and a plurality of pulse nozzles 9 are provided on the pulse air pipes 8. The jet direction of the pulse nozzles 9 is directly facing the bag openings of the first bag group 4, the second bag group 5 and the third bag group 6. The external air source of the pulse air pipes 8 is connected to the air bag.

[0020] Furthermore, the bottom of the housing 1 is welded to the dust collection hopper 7, which is used to collect the dust dropped by the pulse blowing.

[0021] Furthermore, the bags in the first bag group 4 and the third bag group 6 are made of antistatic polypropylene needle-punched felt, and the surface is treated with a nano-coating with a pore size of 1-3μm. The nano-coating can be applied to the surface of the bag through a spraying process to form a hydrophobic layer, which effectively reduces the sticky adhesion of sodium hypophosphite dust.

[0022] Furthermore, the nano-coating is one of fluorosilane-coated multi-walled carbon nanotubes, fluorosilane-modified nano-SiO2, or perfluoroalkyl-modified PTFE nanoparticles.

[0023] If fluorosilane is chosen to coat multi-walled carbon nanotubes, the following effects are achieved: (1) Eliminate hydrophilic defects: The original carbon nanotube surface may have residual hydroxyl groups (introduced during the preparation process), which easily adsorb water vapor. By coating and sealing the hydrophilic groups with fluorosilane, the hydrophobic properties are ensured to be uniform. (2) Maintaining stable conductivity: The fluorosilane coating layer is extremely thin (5-10 nm), which does not block the conductive network formed by carbon nanotubes, and the surface resistance remains stable at 10. 6 -10 8 Ω, meeting anti-static requirements; (3) Reduction resistance: The carbon material and fluorosilane provide dual protection, completely resisting the strong reducing properties of sodium hypophosphite.

[0024] If fluorosilanes are chosen to modify nano-SiO2, the following effects are achieved: (1) Constructing micro-nano rough surfaces: Nano SiO2 forms a "peak-valley" structure on the coating surface, which works in synergy with modified PTFE to form a hydrophobic structure with "low surface energy and roughness", and the static contact angle can be increased to 120-130° (ordinary PTFE coating is about 100-110°). (2) Chemical inertness: SiO2 itself does not react with sodium hypophosphite, and fluorosilane modification further enhances hydrophobicity, avoiding the influence of SiO2's own hydrophilic groups on the effect; (3) Does not clog filter pores: The nanoscale of 50-100nm is much smaller than the diameter of PP needle-punched felt filter pores of 1-3μm, and does not affect air permeability.

[0025] If perfluoroalkyl-modified PTFE nanoparticles are selected, they have the following effects: (1) Extremely low surface energy: Perfluoroalkyl groups further reduce the surface energy to 15-25 mN / m (compared to 20-30 mN / m for ordinary PTFE), which is much lower than that of water molecules, thus preventing water from spreading at the source; (2) Resistance to reduction and temperature: It retains the high stability of the CF bond, and sodium hypophosphite cannot be reduced. It does not soften or decompose at a drying temperature of 120℃. (3) Synergistic anti-adhesion: The low surface energy simultaneously inhibits the adhesion of sodium hypophosphite dust (surface energy of 60-70mN / m after deliquescence), and the hydrophobic and anti-adhesion functions are superimposed.

[0026] Furthermore, the bags in the second bag assembly 5 are made of polyester fiber needle-punched felt with a pore size of 1-3μm. Since the second bag assembly 5 is subjected to less impact, ordinary polyester fiber needle-punched felt is used to reduce costs while meeting the filtration requirements after the airflow in the middle section stabilizes.

[0027] The device is also equipped with other conventional bag filter configurations, such as conventional pressure monitoring systems and conventional clean air chambers. The pressure monitoring system monitors the degree of dust accumulation on the filter bags. When the pressure reaches a specified threshold, it automatically blows the filter bags, causing them to fall into the dust collection hopper 7. Since the inventive point of this utility model is not in these aspects, they will not be described in detail here.

[0028] In our company's sodium hypophosphite drying line, the modified dust collector operated continuously for 72 hours without clogging, which is 9 times better than the traditional structure; the frequency of manual maintenance was reduced from 3 times a day to once a week, saving about 800 hours of labor per year; and the dust emission concentration remained stable below 40mg / m³, meeting environmental protection standards.

Claims

1. A baghouse filter for reducing pluggage, characterized by, Includes a housing (1), with an air inlet (2) at the lower part of the side wall of the housing (1) and an air outlet (3) at the upper part of the side wall. A bag fixing plate (10) is also fixed inside. Several through holes are opened on the bag fixing plate (10). A first bag group (4), a second bag group (5) and a third bag group (6) are arranged in sequence on these through holes according to the air intake direction. The first bag group (4) and the third bag group (6) are symmetrically arranged along the center line of the air intake direction, with Y rows and X bags in each row. The second bag group (5) has 2Y rows and X+2 bags in each row, where Y is a positive integer greater than or equal to 3 and less than or equal to 8, and X is a positive integer greater than or equal to 4 and less than or equal to 6.

2. The bag filter for reducing clogging according to claim 1, characterized in that, The spacing between the rows of the first bag group (4) along the air intake direction decreases sequentially, and the decrease difference is the same. The minimum row spacing is 150mm. The spacing between the last row of the first bag group (4) and the second bag group (5) is the minimum spacing minus 30mm.

3. The reduced plugging baghouse of claim 2, wherein, The spacing between rows of the second bag group (5) is the minimum spacing minus 30mm.

4. The reduced plugging baghouse of claim 1, wherein, The bag fixing plate (10) is provided with several pulse air pipes (8) above it, and several pulse nozzles (9) are provided on the pulse air pipes (8). The jet direction of the pulse nozzles (9) is directly facing the bag openings of the first bag group (4), the second bag group (5) and the third bag group (6).

5. The reduced plugging baghouse of claim 1, wherein, The bottom of the shell (1) is fixedly connected to the ash collection hopper (7).

6. The reduced plugging baghouse of claim 1, wherein, The first bag group (4) and the third bag group (6) are made of antistatic polypropylene needle-punched felt, with a nano-coating on the surface and a pore size of 1-3μm.

7. The reduced plugging baghouse of claim 6, wherein, The nano-coating is one of the following: fluorosilane-coated multi-walled carbon nanotubes, fluorosilane-modified nano-SiO2, or perfluoroalkyl-modified PTFE nanoparticles.

8. The reduced plugging baghouse of claim 1, wherein, The second bag group (5) has a polyester fiber needle-punched felt bag with a pore size of 1-3μm.

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