Wet dust removal device for coal mine screening workshop

Abstract

The utility model relates to dust removal equipment technical field discloses coal mine screening workshop wet dust removal device, including the casing, the casing bottom fixedly connected with the base, the casing outside is equipped with the air inlet and the drain, the casing inside fixedly connected with the air pipe, the air pipe one end is fixedly connected with the air inlet, the air pipe outside is equipped with a plurality of air holes, the casing bottom fixedly connected with the sewage tank, the sewage tank bottom communicates with the drain, the casing inside is fixed from below to above in proper order with the first stage ring pipe, the second stage ring pipe and the third stage ring pipe, the first stage ring pipe bottom is equipped with the first stage nozzle, the first stage ring pipe one side is fixed with the first stage water pipe, realizes the gradient capture of dust " from coarse to fine " through the combination of the first stage nozzle, the second stage nozzle and the third stage nozzle, under the condition that the total water quantity is invariable, greatly promotes PM2.5 grade dust capture efficiency, and simultaneously, adds a plurality of baffle plates between the second stage and the third stage spray layer, divides the airflow, makes the airflow fully contact with the water mist, thereby promotes the dust removal effect.

Description

Technical Field

[0001] This utility model relates to the field of dust removal equipment technology, specifically a wet dust removal device for coal mine screening workshops. Background Technology

[0002] In coal mine production, the screening workshop is one of the core areas for dust generation. Due to the mechanical action of coal crushing, screening, and conveying, a large amount of coal dust diffuses into the air, causing the dust concentration in the working environment to exceed the standard, seriously threatening workers' health and causing the following problems: Dry dust collectors need to be installed independently outdoors, but dust generation points in the screening workshop are scattered (such as vibrating screens, conveyor belt drop points, etc.), resulting in a large number of dust collectors and long pipelines, which not only occupy a lot of space, but also require subsequent maintenance to pass through the building walls, increasing the risk of secondary dust leakage; if the dry dust collectors are moved indoors, a new independent explosion-proof room needs to be built, and the existing workshop building structure (such as floor height and load-bearing capacity) often cannot meet the equipment installation requirements, with renovation costs reaching millions of yuan; therefore, wet dust collectors are needed for dust removal.

[0003] However, most wet scrubbers only have one layer of solid cone nozzles (orifice diameter 5-8mm). When handling large air volumes (>15000m³ / h), the contact time between droplets and dust is less than 0.5 seconds, resulting in an escape rate of over 30% for fine particulate matter below PM10. Utility Model Content

[0004] The purpose of this utility model is to provide a wet dust removal device for coal mine screening workshops to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a wet dust removal device for a coal mine screening workshop, comprising a shell; a base is fixedly connected to the bottom of the shell; an air inlet and a drain outlet are provided on the outer side of the shell; a duct is fixedly connected inside the shell; one end of the duct is fixedly connected to the air inlet; several air outlets are provided on the outer side of the duct; a wastewater tank is fixedly connected to the bottom of the shell; the bottom of the wastewater tank is connected to the drain outlet; a scraping assembly is provided inside the wastewater tank; a primary ring pipe, a secondary ring pipe, and a tertiary ring pipe are fixedly arranged from bottom to top inside the shell; a primary nozzle is provided at the bottom of the primary ring pipe; a primary water inlet pipe is fixed on one side of the primary ring pipe; a secondary nozzle is provided at the bottom of the secondary ring pipe; a secondary water inlet pipe is fixed on one side of the secondary ring pipe; a tertiary nozzle is provided at the bottom of the tertiary ring pipe; a tertiary water inlet pipe is fixed on one side of the tertiary ring pipe; and a demister is fixedly connected to the air outlet at the upper end of the shell.

[0006] Preferably, the primary nozzle is a large-diameter spiral nozzle (8-10mm), the secondary nozzle is a solid conical nozzle (3-5mm), and the tertiary nozzle is an air atomizing nozzle (1-2mm).

[0007] Preferably, the scraping assembly includes a motor, which is fixed on a base. A rotating shaft is fixedly connected to the output end of the motor. The upper end of the rotating shaft is inserted into the sewage tank. Several scrapers are fixedly connected to the outside of the rotating shaft through several connecting rods. The scrapers are all L-shaped and fit against the inner wall of the sewage tank and the bottom wall of the housing.

[0008] Preferably, a dispersion plate is fixedly connected inside the housing, the dispersion plate is located between the air duct and the primary ring pipe, and the dispersion plate is uniformly provided with a plurality of dispersion holes.

[0009] Preferably, a plurality of partitions are provided between the secondary ring pipe and the tertiary ring pipe, and the partitions are all fixed inside the housing, with an air duct formed between two adjacent partitions.

[0010] Compared with existing technologies, the combination of primary, secondary and tertiary nozzles achieves gradient dust collection from coarse to fine, greatly improving the collection efficiency of PM2.5 dust while keeping the total water volume constant. At the same time, several baffles are added between the secondary and tertiary spray layers to divide the airflow, allowing the airflow to fully contact the water mist, thereby improving the dust removal effect. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a cross-sectional view of the internal structure of this utility model;

[0013] Figure 3 This is a schematic diagram of the internal structure of the sewage tank of this utility model.

[0014] In the diagram: 1. Housing; 2. Air inlet; 3. Drain outlet; 4. Scraper assembly; 41. Motor; 42. Shaft; 43. Connecting rod; 44. Scraper; 5. Wastewater tank; 6. Base; 7. Primary water inlet pipe; 8. Primary ring pipe; 9. Primary nozzle; 10. Secondary water inlet pipe; 11. Secondary ring pipe; 12. Secondary nozzle; 13. Tertiary water inlet pipe; 14. Tertiary ring pipe; 15. Tertiary nozzle; 16. Demister; 17. Air duct; 18. Air outlet; 19. Dispersion plate; 20. Dispersion hole; 21. Baffle plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-3 The present invention provides the following technical solution:

[0017] Example 1: A wet dust removal device for a coal mine screening workshop includes a shell 1; a base 6 is fixedly connected to the bottom of the shell 1; an air inlet 2 and a drain outlet 3 are provided on the outside of the shell 1; an air duct 17 is fixedly connected inside the shell 1, one end of the air duct 17 is fixedly connected to the air inlet 2, and several air outlets 18 are provided on the outside of the air duct 17; a sewage tank 5 is fixedly connected to the bottom of the shell 1, and the bottom of the sewage tank 5 is connected to the drain outlet 3; inside the shell 1, from bottom to top, a primary ring pipe 8, a secondary ring pipe 11, and a tertiary ring pipe 14 are fixedly fixed; a primary nozzle 9 is provided at the bottom of the primary ring pipe 8; a primary water inlet pipe 7 is fixed on one side of the primary ring pipe 8; and the bottom of the secondary ring pipe 11... The device is equipped with a secondary nozzle 12 at one end, a secondary water inlet pipe 10 fixed on one side of the secondary ring pipe 11, a tertiary nozzle 15 at the bottom of the tertiary ring pipe 14, a tertiary water inlet pipe 13 fixed on one side of the tertiary ring pipe 14, and a demister 16 fixedly connected to the air outlet at the upper end of the housing 1. Through the combination of the primary nozzle 9, the secondary nozzle 12 and the tertiary nozzle 15, the dust is captured in a gradient from coarse to fine. Under the condition that the total water volume remains unchanged, the dust collection efficiency of PM2.5 level is greatly improved. At the same time, several baffles 21 are added between the secondary and tertiary spray layers to divide the airflow and make the airflow fully contact the water mist, thereby improving the dust removal effect.

[0018] The first-stage nozzle 9 is a large-aperture spiral nozzle with an orifice diameter of 8-10mm, forming a high-pressure water curtain to capture large dust particles >50μm, reducing the load on subsequent treatment. The second-stage nozzle 12 is a solid cone nozzle with an orifice diameter of 3-5mm, capturing medium-sized dust particles 10-50μm through dense water mist. The third-stage nozzle 15 is an air atomizing nozzle with an orifice diameter of 1-2mm, generating fine mist droplets 5-20μm, efficiently capturing PM2.5 dust.

[0019] A dispersion plate 19 is fixedly connected inside the housing 1. The dispersion plate 19 is located between the air duct 17 and the primary ring pipe 8. Several dispersion holes 20 are evenly provided on the dispersion plate 19 to evenly distribute the airflow and prevent the local flow velocity from being too high, which would cause dust to escape.

[0020] Several baffles 21 are provided between the secondary ring pipe 11 and the tertiary ring pipe 14. The baffles 21 are all fixed inside the housing 1. An air duct is formed between two adjacent baffles 21 to divide the airflow and allow the airflow to fully contact the water mist, thereby improving the dust removal effect.

[0021] In use, an external fan delivers air containing coal dust into the duct 17. The airflow is dispersed into the housing 1 through several air outlets 18, and further dispersed through several dispersion holes 20 to evenly distribute the airflow and prevent dust from escaping due to excessively high local flow velocities. Then, dust removal is performed through primary nozzle 9, secondary nozzle 12, and tertiary nozzle 15. Primary nozzle 9 forms a high-pressure water curtain to capture large dust particles >50μm, reducing the load on subsequent processing. Secondary nozzle 12 is a solid conical nozzle with an orifice diameter of 3-5mm, capturing medium dust particles of 10-50μm through dense water mist. Tertiary nozzle 15 is an air atomizing nozzle with an orifice diameter of 1-2mm, generating fine mist droplets of 5-20μm, efficiently capturing PM2.5 dust and greatly improving the dust removal effect. The airflow after dust removal is discharged from the outlet through the demister 16.

[0022] In embodiment two, based on the technical solution of embodiment one, a scraping component 4 is also provided. The scraping component 4 includes a motor 41, which is fixed on the base 6. The output end of the motor 41 is fixedly connected to a rotating shaft 42. The upper end of the rotating shaft 42 is inserted into the sewage tank 5. Several scrapers 44 are fixedly connected to the outside of the rotating shaft 42 through several connecting rods 43. The scrapers 44 are all L-shaped and are in contact with the inner wall of the sewage tank 5 and the bottom wall of the shell 1. The sewage after dust removal will be concentrated in the sewage tank 5. When the sewage is discharged through the drain outlet 3 or when the internal parts of the shell 1 are cleaned later, the motor 41 drives the rotating shaft 42 to rotate. The rotating shaft 42 drives the scrapers 44 to rotate in the sewage tank 5 through several connecting rods 43, thereby scraping off the sludge adhering to the inner wall of the sewage tank 5 and the bottom wall of the shell 1 so that the sludge can be discharged with the sewage.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wet dust removal device for a coal mine screening plant, characterized in that, Includes the housing (1); The bottom of the housing (1) is fixedly connected to a base (6). An air inlet (2) and a drain outlet (3) are provided on the outside of the housing (1). An air duct (17) is fixedly connected inside the housing (1). One end of the air duct (17) is fixedly connected to the air inlet (2). Several air outlets (18) are provided on the outside of the air duct (17). A sewage tank (5) is fixedly connected to the bottom of the housing (1). The bottom of the sewage tank (5) is connected to the drain outlet (3). A scraping component (4) is provided inside the sewage tank (5). Inside the housing (1), a first-stage ring pipe (8), a second-stage ring pipe (11), and a third-stage ring pipe (14) are fixed from bottom to top. The first-stage ring pipe (8) has a first-stage nozzle (9) at its bottom end and a first-stage water inlet pipe (7) fixed on one side. The second-stage ring pipe (11) has a second-stage nozzle (12) at its bottom end and a second-stage water inlet pipe (10) fixed on one side. The third-stage ring pipe (14) has a third-stage nozzle (15) at its bottom end and a third-stage water inlet pipe (13) fixed on one side. A demister (16) is fixedly connected to the air outlet at the top of the housing (1).

2. The coal mine screening plant wet dust removal device according to claim 1, characterized in that: The first-stage nozzle (9) is a large-diameter spiral nozzle, the second-stage nozzle (12) is a solid conical nozzle, and the third-stage nozzle (15) is an air atomizing nozzle.

3. The coal mine screening plant wet dust removal device according to claim 1, characterized in that: The scraping assembly (4) includes a motor (41), which is fixed on the base (6). The output end of the motor (41) is fixedly connected to a rotating shaft (42). The upper end of the rotating shaft (42) is inserted into the sewage tank (5). Several scrapers (44) are fixedly connected to the outside of the rotating shaft (42) through several connecting rods (43). The scrapers (44) are all L-shaped and fit against the inner wall of the sewage tank (5) and the bottom wall of the shell (1).

4. The wet dust removal device for coal mine screening workshops according to claim 1, characterized in that: A dispersion plate (19) is fixedly connected inside the housing (1). The dispersion plate (19) is located between the air duct (17) and the primary ring pipe (8). A number of dispersion holes (20) are uniformly provided on the dispersion plate (19).

5. The wet dust removal device for coal mine screening workshops according to claim 1, characterized in that: A number of partitions (21) are provided between the secondary ring pipe (11) and the tertiary ring pipe (14). The partitions (21) are all fixed inside the shell (1), and an air duct is formed between two adjacent partitions (21).

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