A coal mill dust removal and recovery device

Abstract

This utility model discloses a coal mill dust removal and recovery device, including a recovery box with an air inlet and an air outlet on its sides. A recovery chamber communicating with the air inlet and outlet is provided within the recovery box. The recovery chamber contains a recovery mechanism for recovering coal dust from the gas. The recovery mechanism includes an impeller rotatably disposed within the recovery chamber, with its blades rotating towards the air inlet so that the blades move in the opposite direction to the airflow. The recovery mechanism also includes a humidification component for humidifying the contact surface between the blades and the incoming gas, assisting the blades in collecting coal dust from the gas. This utility model, through a controllable humidification component, forms a moist adsorption layer on the blade surface, effectively capturing dust of various particle sizes, including fine coal dust, improving the collection and recovery effect, and reducing dust generation.

Description

Technical Field

[0001] This utility model relates to the technical field of industrial dust removal equipment, specifically to a coal mill dust removal and recovery device. Background Technology

[0002] During coal processing, coal milling systems generate large amounts of high-concentration, fine-particle coal dust. This dust not only pollutes the environment and endangers human health, but also represents a waste of resources if directly emitted as a valuable raw material. Therefore, efficient dust removal and coal dust recovery from the dust-laden gases generated by coal milling systems are crucial.

[0003] Existing coal mill dust removal equipment, such as bag filters and electrostatic precipitators, is widely used, but coal dust tends to adhere to it, which is not conducive to the cleaning and recovery of coal dust. At the same time, some coal dust will still remain in the gas and be discharged, resulting in poor dust removal and recovery effects. Utility Model Content

[0004] Technical objective: To address the shortcomings of existing coal mill equipment, this utility model discloses a coal mill dust removal and recovery device.

[0005] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: This utility model discloses a coal mill dust removal and recovery device, including a recovery box with an air inlet and an air outlet on its sides. A recovery chamber communicating with the air inlet and outlet is provided within the recovery box. The recovery chamber contains a recovery mechanism for recovering coal dust from the gas. The recovery mechanism includes an impeller rotatably disposed within the recovery chamber, with its blades rotating towards the air inlet so that the blades move in the opposite direction to the airflow. The recovery mechanism also includes a humidification component for humidifying the contact surface between the blades and the incoming gas, assisting the blades in collecting coal dust from the gas.

[0006] Preferably, the humidification component of this utility model is an atomizing nozzle fixed in the recovery chamber, which is connected to an external water supply device to spray atomized water droplets for humidification; the atomizing nozzle is located on the air inlet flow path.

[0007] Preferably, the blades of this invention have a hollow structure, and water-permeable micropores are opened on the surface of the impeller that contacts the air intake. Water inside the impeller is drawn out to the blades through the water-permeable micropores to capture coal ash in the incoming air.

[0008] Preferably, the recovery chamber of this utility model is further provided with a cleaning mechanism for cleaning the coal ash adhering to the blade surface. The cleaning mechanism is located on the side near the air outlet. After the blade captures coal powder in the gas, the cleaning mechanism cleans and separates the coal ash from the blade, so that the blade can continue to carry out the next round of coal ash capture and recovery.

[0009] Preferably, the ash removal mechanism of this utility model includes a scraper rotatably disposed in the recovery chamber, wherein the end profile of the scraper matches the cross-sectional shape of the blade, and the scraper scrapes off the coal ash captured by the blade.

[0010] Preferably, the scraper of this utility model includes a scraper body and a telescopic scraper head slidably disposed on the scraper body for cooperating with the blades. The end face of the telescopic scraper head near the scraper body is connected to the scraper body by a spring.

[0011] Beneficial effects: The coal mill dust removal and recovery device disclosed in this utility model has the following beneficial effects: 1. This invention utilizes a reverse impeller rotation design, causing the blades to move in the opposite direction to the dust-laden airflow, significantly increasing the relative velocity and collision probability between dust particles and the collecting blades. Combined with a controllable humidification component, a moist adsorption layer is formed on the blade surface, effectively capturing dust particles of various sizes, including fine coal dust, thus improving collection and recovery efficiency.

[0012] 2. This invention introduces a humidification component to provide appropriate surface humidity for the collection process. This not only enhances the adhesion of dust to the blades and effectively prevents the collected coal dust from being re-entrained by high-speed airflow or mechanical force, but also allows the coal dust to be removed and recovered in slightly damp clumps by controlling the amount of humidification, making it easier to collect compared to a completely dry state.

[0013] 3. This utility model is equipped with a dust removal mechanism that can automatically remove the coal ash accumulated on the blade surface. This ensures the continuous cleanliness of the blade collection surface and efficient collection capacity, avoiding the trouble of manual cleaning or equipment shutdown for dust removal, and realizing continuous and automated operation of the dust removal and recycling process.

[0014] 4. The humidification and collection method of this utility model is highly targeted, only wetting the collection surface or premixing the aerosol, using very little water, and the water is absorbed or evaporated by the coal powder, basically not producing any process wastewater discharged externally, saving water resources and eliminating the need for a complicated wastewater treatment system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0016] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a schematic diagram showing the interaction between the dust removal mechanism and the blades of this utility model; Figure 3 This is a cross-sectional view of the scraper structure of this utility model; Among them, 1-recovery box, 2-air inlet, 3-air outlet, 4-recovery chamber, 5-impeller, 6-scraper, 7-scraper body, 8-telescopic scraper head, 9-spring. Detailed Implementation

[0017] Reference will now be made in detail to embodiments of the present disclosure, one or more of which are set forth herein. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. Rather, the following description provides convenient illustrations for implementing exemplary embodiments of the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0018] like Figure 1 As shown, this utility model discloses a coal mill dust removal and recovery device, including a recovery box 1. The recovery box 1 is provided with an air inlet 2 and an air outlet 3, which are respectively located on both sides of the recovery box 1. A recovery chamber 4 is provided inside the recovery box 1, which communicates with the air inlet 2 and the air outlet 3. The recovery chamber 4 is provided with a recovery mechanism for recovering coal dust in the gas. The recovery mechanism includes an impeller 5 rotatably disposed in the recovery chamber 4. The blades of the impeller 5 rotate toward the air inlet side so that the movement direction of the blades is opposite to the airflow direction. The recovery mechanism is also provided with a humidification component for humidifying the contact surface between the blades and the airflow gas to assist the blades in collecting coal dust in the gas.

[0019] In one specific embodiment, the humidification component of this invention is an atomizing nozzle fixed in the recovery chamber, which is connected to an external water supply device to spray atomized water droplets for humidification; the atomizing nozzle is located on the air inlet flow path; if, in order to improve the impeller's capture effect on coal dust, as a preferred embodiment, this invention provides another humidification component embodiment, in which the blades of this invention adopt a hollow structure, and water-passing micropores are opened on the surface of the impeller that contacts the air inlet; the corresponding impeller shaft can be designed as a hollow structure and connected to the impeller, and the shaft is connected to an external water supply device. The components are connected by a rotary joint, which ensures that water supply is maintained while the shaft rotates driven by a motor or other equipment. The rotary joint is a mature pipeline connection device, and the connected pipelines can rotate relative to each other to transport various media such as gas, liquid, and oil. This utility model will not elaborate on the specific water flow. During the impeller rotation, water in the impeller is drawn out to the blades through water-passing micro-holes to capture coal ash in the incoming air. To make the conveying process controllable, a valve can also be used to achieve intermittent water supply.

[0020] To ensure the continuous operation of the dust removal and coal powder collection processes, such as Figure 2 and Figure 3As shown, the recovery chamber of this utility model is also equipped with a cleaning mechanism for cleaning the coal ash adhering to the blade surface. The cleaning mechanism is located on the side near the air outlet. After the blade captures coal powder in the gas, the cleaning mechanism cleans and separates the coal ash from the blade, so that the blade can continue to carry out the next round of coal ash capture and recovery.

[0021] The ash removal mechanism of this utility model includes a scraper 6 rotatably disposed in the recovery chamber. The scraper 6 can be driven to rotate by a motor so that the rotation angle can be controlled. The end profile of the scraper 6 matches the cross-sectional shape of the blade. The scraper 6 scrapes off the coal ash collected by the blade. The number of blades is preferably 4 sets, and should not be too many, otherwise it will not be conducive to the cleaning of the blade surface and may cause interference. The blades preferably adopt a cylindrical structure with a concave center to facilitate the collection and retention of coal ash. The end face of the scraper 6 also adopts a matching arc shape. By moving the scraper 6 on the blade surface, the attached coal powder is scraped off, and the blade surface is cleaned so that coal ash can be collected again.

[0022] During scraper cleaning, since the collection process mainly relies on the contact between coal dust and the impeller surface for adhesion, the impeller speed requirement is not high. The impeller rotates slowly, and the blades only provide a surface for coal dust adhesion. Therefore, during the upward rotation of the blades, the scraper can be used to gradually rotate from the root of the impeller to the tip to clean the coal dust from the blade surface. By pre-simulating the trajectory, the rotation of the scraper 6 is controlled while the impeller rotates at a constant speed, so that the rotation trajectory of the scraper 6 matches the positional changes of the blades caused by the impeller rotation. This allows the coal dust cleaning of the blade surface to be completed simultaneously without stopping the machine. The structural strength of the blades should be designed as a rigid structure capable of withstanding the force of the scraper 6, for example, using alloy materials to provide rigidity and prevent deformation.

[0023] To further improve structural reliability and avoid structural damage caused by rigid collisions, such as Figure 3 As shown, the scraper 6 of this utility model includes a scraper body 7 and a telescopic scraper head 8 slidably disposed on the scraper body 7 for cooperating with the blade. The end of the telescopic scraper head 8 near the scraper body 7 is T-shaped. The scraper body 7 has a sliding cavity that cooperates with the telescopic scraper head 8. The end face of the telescopic scraper head 8 near the scraper body 7 is connected to the inner wall of the cavity of the scraper body 7 by a spring 9. The spring 9 is configured to provide a certain thrust to the telescopic scraper head 8 in advance. When the force does not exceed the thrust, the position of the telescopic scraper head 8 remains unchanged. When the force exceeds the thrust, it slides into the scraper body 7 to protect the equipment. To ensure smooth sliding, a sliding guide structure such as a guide rail can be set to guide the sliding and improve the stability of the structure.

[0024] In use, the air inlet 2 or air outlet 3 is connected to a fan. The fan draws in gas containing coal dust, providing the power to propel the airflow for the entire dust collection and recovery device. After the gas enters the recovery chamber 1, the impeller 5 rotates at a predetermined speed driven by a connected motor. The humidification component sprays water or adds water through micropores on the blade surface to ensure the blades capture the coal dust in the gas. When the blades containing coal dust rotate to... Figure 1 When the scraper of the ash removal mechanism moves to the root of the corresponding blade in the right-hand area of ​​the recovery chamber as shown, the scraper rotates counterclockwise and moves towards the end of the blade while the blade rotates. In the next process, the coal dust on the surface of the blade is cleaned. The telescopic scraper head 8 is moved by the spring 9 to ensure the smooth implementation of the entire scraper action. The range of motion of the scraper is limited to the range of the blade. It is preferable to adopt a swing form. After moving to the end of the blade, the scraper will reset and start cleaning the next blade after the blade has rotated. This eliminates the need to rotate a full circumference and reduces the space requirement in the upper part of the recovery chamber.

[0025] The coal dust removed by the scraper will accumulate at the bottom of the recovery chamber. After a period of time, the recovered coal dust can be removed through the window or operating door pre-drilled on the recovery box.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A coal mill dust removal and recovery device, characterized in that, The system includes a recovery box (1), on which an air inlet (2) and an air outlet (3) are provided. The air inlet (2) and the air outlet (3) are located on opposite sides of the recovery box (1). A recovery chamber (4) communicating with the air inlet (2) and the air outlet (3) is provided inside the recovery box (1). The recovery chamber (4) is provided with a recovery mechanism for recovering coal powder in the gas. The recovery mechanism includes an impeller (5) rotatably disposed in the recovery chamber (4). The blades of the impeller (5) rotate toward the air inlet side so that the movement direction of the blades is opposite to the air flow direction. The recovery mechanism is also provided with a humidification component for humidifying the contact surface between the blades and the air inlet to assist the blades in collecting coal powder in the gas.

2. The coal mill dust removal and recovery device according to claim 1, characterized in that, The humidification component is an atomizing nozzle fixed in the recovery chamber. It is connected to an external water supply device through the atomizing nozzle to spray atomized water droplets for humidification. The atomizing nozzle is located on the air inlet flow path.

3. The coal mill dust removal and recovery device according to claim 1, characterized in that, The blades have a hollow structure, with water-permeable micropores on the surface of the impeller that comes into contact with the air intake. Water is drawn out of the impeller to the blades through the micropores to capture coal ash in the incoming air.

4. The coal mill dust removal and recovery device according to claim 1, characterized in that, The recovery chamber is also equipped with a cleaning mechanism for cleaning coal ash adhering to the blade surface. The cleaning mechanism is located on the side near the air outlet. After the blades capture coal powder in the gas, the cleaning mechanism cleans and separates the coal ash from the blades, allowing the blades to continue the next round of coal ash capture and recovery.

5. The coal mill dust removal and recovery device according to claim 4, characterized in that, The ash removal mechanism includes a scraper (6) that is rotatably disposed in the recovery chamber. The end profile of the scraper (6) matches the cross-sectional shape of the blade. The scraper (6) scrapes off the coal ash collected by the blade.

6. The coal mill dust removal and recovery device according to claim 5, characterized in that, The scraper (6) includes a scraper body (7) and a telescopic scraper head (8) slidably disposed on the scraper body (7) for cooperating with the blade. The end face of the telescopic scraper head (8) near the scraper body (7) is connected to the scraper body (7) by a spring (9).

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