Dust removal process for open-air crushing station of coal mine

Abstract

The invention discloses a dust removal process for an open-air crushing station of a coal mine. A coal shed is arranged above a coal dumping position of a coal conveyor of the open-air crushing station, and the coal shed is provided with a coal conveyor entrance and exit; s2; a dust collection cover is arranged in the coal shed and connected with a first dust collection hose, and the first dust collection hose is connected with a centrifugal fan and an ultrafiltration dust remover; (S3); conveying the pulverized coal in the ultrafiltration dust remover into a curing and mixing stirrer, adding the composite colloidal solution into the curing and mixing stirrer, stirring and curing the composite colloidal solution and the pulverized coal, and outputting granular pulverized coal by the curing and mixing stirrer; (S4); and conveying the granular pulverized coal output by the curing and mixing stirrer to a coal conveying belt through a scraper conveyor, and enabling the granular pulverized coal to enter system coal flow. The pulverized coal flying away from the open-air crushing station can be effectively utilized, and coal resources are saved.

Description

Technical Field

[0001] The invention relates to the field of coal dust management in coal mines, and in particular to a dust removal process for an open-air crushing station in a coal mine. Background Art

[0002] Coal mine open-pit crushing station is one of the mechanical equipment used in open-pit coal mining. It is mainly used to crush and grade the collected ore. The ore is crushed into the required particle size through the crushing equipment, so that it reaches the appropriate size to enter the next production link. Reasonable crushing and grading can reduce the transportation and processing costs of ore, significantly increase the output of ore dressing, and reduce the burden of ore dressing process, thereby improving the production efficiency of the entire mining industry and thus improving economic benefits.

[0003] In the related art, common open-air crushing stations are open-top. Coal trucks transport coal to open-air crushing stations, and the coal is dumped into the unloading hopper. After dumping, the coal is transported to the crusher by a conveyor for crushing. There is no shelter in the unloading hopper of the coal truck at the open-air crushing station. The coal powder is directly blown into the air after passing through the ambient wind, forming a large amount of dust. The coal powder content of a truck of coal is about 20-30% (finely crushed coal powder, i.e., coal powder). During the dumping process, 5-10% of the coal powder will be flying and lost under the action of the wind. Assuming that a truck transports 60 tons of coal, at least 0.6 tons of coal will be lost.

[0004] With regard to the above-mentioned related technologies, when the coal truck at the open-air crushing station dumps materials from the unloading hopper, coal dust is seriously generated, mostly in the form of impact dust. Due to the lack of shelter and any dust removal methods, the coal dust cannot be suppressed or collected and can only fly and dissipate into the environment. The flying and dissipated coal dust cannot be utilized, resulting in a waste of resources and serious pollution to the environment. Summary of the invention

[0005] In order to effectively utilize the coal powder scattered by the open-air crushing station and save coal resources, the present application provides a dust removal process for the open-air crushing station in a coal mine.

[0006] The present application provides a dust removal process for an open-pit crushing station in a coal mine, which adopts the following technical solution:

[0007] A dust removal process for an open-pit crushing station in a coal mine comprises the following steps:

[0008] S1; a coal shed for limiting the spread of coal powder is set above the coal dumping place of the coal truck of the open-air crushing station, and the coal shed is provided with an inlet and outlet for the coal truck;

[0009] S2; a dust collecting hood cooperating with the unloading hopper of the coal truck is arranged in the coal shed, the dust collecting hood is connected to a first dust collecting hose, the first dust collecting hose is connected to an ultrafiltration dust collector, the ultrafiltration dust collector effectively absorbs, filters, settles and collects the coal powder absorbed by the dust collecting hood, and the ultrafiltration dust collector is connected to a centrifugal fan driving the dust collecting hood to extract;

[0010] S3; the pulverized coal in the ultrafiltration dust collector is transported to a solidification mixer, and then the composite colloidal solution and the pulverized coal are added to the solidification mixer for mixing and solidification, and the output of the solidification mixer is granular pulverized coal;

[0011] S4: The granular coal powder output from the solidifying mixer is transported to the coal conveying belt through a scraper conveyor and enters into the system coal flow.

[0012] Optionally, two hydraulic cylinders for controlling the upward and downward movement and rotation of the dust collecting hood are fixedly connected to the top of the coal shed, and the output ends of the hydraulic cylinders are both rotatably connected to the dust collecting hood.

[0013] Optionally, a side suction port is provided on the side of the lower end portion of the coal shed, and the side suction port is connected to a second dust collecting hose, and the second dust collecting hose is connected to the first dust collecting hose.

[0014] Optionally, the inner walls of the first dust collection hose and the second dust collection hose are coated with a hydrophobic and wear-resistant coating.

[0015] Optionally, an automatic sensing electric door is provided at the entrance and exit of the coal truck of the coal shed, a position sensor for detecting the position of the coal truck is installed near the automatic sensing electric door, and the automatic sensing electric door is installed with a distance sensor for controlling the opening size of the electric door.

[0016] Optionally, the mass ratio of water to colloid in the composite colloidal solution is 40-50:1, and the mass ratio of the composite colloidal solution to coal powder is 1:10-20.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] 1. First, a coal shed is set up to limit the diffusion path of coal powder, and then the flying coal powder in the unloading process is absorbed by the dust collecting hood and the side suction port, and then transported to the ultrafiltration dust collector for re-absorption, filtration, sedimentation, and collection, and then transported to the solidification mixer, and then the composite colloidal solution is added to the coal powder for stirring and solidification. The composite colloidal solution has no effect on the properties of the coal powder itself, but only changes its viscosity, and then outputs it as granular coal powder. Finally, it is transported to the coal conveyor belt through the scraper conveyor and enters the coal flow, realizing the comprehensive control of flying coal powder, avoiding pollution to the environment, and effectively utilizing the flying coal powder, which greatly saves coal resources;

[0019] 2. The side suction port performs side suction, and the coal powder scattered to the lower end of the coal shed during the dumping process is extracted and transported to the first dust collecting hose through the second dust collecting hose, and then enters the ultrafiltration dust collector, further reducing the loss of coal powder; BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a dust removal process for an open-pit crushing station in a coal mine according to an embodiment of the present application.

[0021] Figure 2 It is a schematic diagram of the positions of the automatic induction electric door and the coal truck of the present application.

[0022] Explanation of the reference numerals: 1. Coal truck; 2. Coal shed; 3. Inlet and outlet; 4. Dust hood; 5. First dust collection hose; 6. Ultrafiltration dust collector; 7. Centrifugal fan; 8. Screw conveyor; 9. Solidification mixing agitator; 10. Scraper conveyor; 11. Hydraulic cylinder; 12. Side suction port; 13. Second dust collection hose; 14. Automatic induction electric door; 15. Position sensor; 151. First sensor; 152. Second sensor; 16. Distance sensor; 17. Steel structure support. DETAILED DESCRIPTION

[0023] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0024] The embodiment of the present application discloses a dust removal process for an open-pit crushing station in a coal mine.

[0025] Example

[0026] Reference Figure 1 and Figure 2 , a dust removal process for an open-pit crushing station in a coal mine, comprising the following steps:

[0027] S1; A steel structure coal shed 2 for limiting the spread of coal powder is set above the coal truck 1 unloading place of the open-air crushing station. The structure of the coal shed 2 can withstand the influence of heavy snow and 12-level strong wind. The coal shed 2 limits the dust diffusion area and defines the dust control area.

[0028] The coal shed 2 is provided with an entrance and exit 3 for coal trucks, and an automatic induction electric door 14 is provided at the entrance and exit 3 for coal trucks in the coal shed 2. A position sensor 15 for detecting the position of the coal truck 1 is installed near the automatic induction electric door 14. The position sensor 15 can be a geomagnetic sensor, an infrared sensor, etc. The position sensor 15 includes a plurality of first sensors 151 and a plurality of second sensors 152. When the coal truck 1 reaches the set position of the automatic induction electric door 14, the first sensor 151 senses the position of the coal truck 1, and the automatic induction electric door 14 gradually opens. When the coal truck 1 moves to the specified position in the automatic induction electric door 14 (at this time, the unloading hopper of the coal truck 1 is located between the doors on both sides of the automatic induction electric door 14), the second sensor 152 senses the position of the coal truck 1, and the automatic induction electric door 14 gradually closes. The automatic sensing electric door 14 is equipped with a distance sensor 16 for controlling the size of the electric door opening. The distance sensor 16 can be an infrared sensor. The distance sensor 16 senses the distance between the electric door and the coal truck 1. When the electric door is a set distance away from the coal truck 1, the electric door stops moving, and the size of the electric door opening is determined, thereby eliminating the impact of through-draft ventilation on the airflow inside the steel structure to a greater extent and reducing the flying and loss of coal powder.

[0029] S2; a dust hood 4 cooperating with the unloading hopper of the coal truck 1 is arranged in the coal shed 2, the dust hood 4 is connected to the first dust collecting hose 5, a steel structure bracket 17 is fixedly connected to the top of the coal shed 2, the steel structure bracket 17 is fixedly connected to two hydraulic cylinders 11 for controlling the up and down movement and rotation of the dust hood 4, the two hydraulic cylinders 11 are arranged in parallel, the output ends of the hydraulic cylinders 11 are both rotatably connected to the dust hood 4, the output ends of the two hydraulic cylinders 11 are extended or shortened at the same time to realize the up and down movement of the dust hood 4; the output ends of the two hydraulic cylinders 11 are at different heights, so that the dust hood 4 can be flipped.

[0030] The dust hood 4 is provided with an ultrasonic sensor. After the coal truck 1 enters the designated position of the coal shed 2, when the dust hood 4 descends, the ultrasonic sensor senses the designated distance from the discharge hopper, the dust hood 4 stops descending, and then the angle of the dust hood 4 is adjusted by the hydraulic cylinder 11.

[0031] The ultrafiltration dust collector 6 is connected to a centrifugal fan 7. When the coal truck 1 dumps its discharge hopper, the two hydraulic cylinders 11 cause the dust hood 4 to first move down close to the discharge hopper, and then rotate until the dust hood 4 is parallel to the discharge hopper, so as to absorb the flying coal powder to the greatest extent. The first dust collecting hose 5 is connected to the ultrafiltration dust collector 6. Under the action of the centrifugal fan 7, the first dust collecting hose 5 absorbs the flying coal powder and transports it to the ultrafiltration dust collector 6. The ultrafiltration dust collector 6 effectively absorbs, filters, settles and collects the coal powder absorbed by the dust collecting hood 4.

[0032] During the dumping process of the discharge hopper, some coal powder will fly and escape to the lower end of the coal shed 2. A side suction port 12 is provided on the side of the lower end of the coal shed 2. The side suction port 12 is in the form of a shutter. The side suction port 12 is connected to a second dust collecting hose 13, and the second dust collecting hose 13 is connected to the first dust collecting hose 5. The side suction port 12 in the form of a shutter is used for side suction, and the coal powder scattered to the lower end of the coal shed 2 during the dumping process is extracted and transported to the first dust collecting hose 5 through the second dust collecting hose 13, and enters the ultrafiltration dust collector 6, further reducing the loss of coal powder.

[0033] In order to solve the dust accumulation and sedimentation problem of the first dust collecting hose 5 and the second dust collecting hose 13, a hydrophobic and wear-resistant coating is applied to the inner wall of the first dust collecting hose 5 and the second dust collecting hose 13 to reduce the possibility of dust accumulation and ensure the cleanliness of the pipe; after the suction pipe is coated, it can not only increase the wear resistance and corrosion resistance of the pipe and extend the service life of the pipe, but also improve the hydrophobic performance of the pipe and reduce the probability of water and dust adhesion.

[0034] S3; The coal powder in the ultrafiltration dust collector 6 is conveyed to the solidification mixer 9 through the screw conveyor 8, and then the composite colloidal solution and the coal powder are added to the solidification mixer 9 for stirring and solidification. The mass ratio of water and colloid in the composite colloidal solution is 40-50:1, and the mass ratio of the composite colloidal solution to the coal powder is 1:10-20. The composite colloidal solution can be made of a high water retention material. The composite colloidal solution has no effect on the properties of the coal powder itself, but only changes its viscosity. The composite colloidal solution material is added to the collected coal powder, and then the composite colloidal solution material and the coal powder are fully stirred and mixed by the solidification mixer 9, and finally output as granular coal powder;

[0035] S4; the granular coal powder output from the solidifying mixer 9 is transported to the coal conveying belt through the scraper conveyor 10 and enters the system coal flow.

[0036] In this embodiment, the coal truck inlet and outlet 3 and the automatic induction electric door 14 are provided in two, so that the coal truck 1 can be entered from both directions, thereby improving the unloading and dust removal efficiency. When there are two coal truck inlet and outlet 3, two groups of dust hoods 4 are also provided, and each group of dust hoods 4 is connected to two hydraulic cylinders 11, and the hydraulic cylinders 11 are fixedly connected to the steel structure support 17.

[0037] Through the above-mentioned dust removal process of the present application, the flying coal powder during the unloading process of the open-air crushing station coal truck 1 is finally output as granular coal powder and enters the coal flow, thereby realizing the comprehensive control of the flying coal powder, the flying coal powder is effectively utilized, coal resources are saved, and pollution to the environment is avoided.

[0038] The implementation principle of the dust removal process of an open-pit crushing station in a coal mine in an embodiment of the present application is as follows: first, a coal shed 2 is set up to limit the diffusion path of coal powder, and then the flying coal powder in the unloading process is absorbed by the dust collecting hood 4 and the side suction port 12, and transported to the ultrafiltration dust collector 6 for re-absorption, filtration, sedimentation, and collection, and then transported to the solidification mixing agitator 9 through the screw conveyor 8, and then the composite colloidal solution material is added to the coal powder for stirring and solidification, and the granular coal powder is output, and finally transported to the coal transport belt through the scraper conveyor 10 and enters the coal flow, thereby realizing the comprehensive control of flying coal powder, avoiding pollution to the environment, and effectively utilizing the flying coal powder, which greatly saves coal resources.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dust removal process for an open-pit crushing station in a coal mine, characterized by: The following steps are involved: S1； A coal shed (2) for limiting the spread of coal powder is arranged above the coal dumping place of the coal truck (1) of the open-air crushing station, and the coal shed (2) is provided with an inlet and outlet (3) for the coal truck; S2; a dust collecting hood (4) cooperating with the unloading hopper of the coal transport vehicle (1) is arranged in the coal shed (2); the dust collecting hood (4) is connected to a first dust collecting hose (5); the first dust collecting hose (5) is connected to an ultrafiltration dust collector (6); the ultrafiltration dust collector (6) effectively absorbs, filters, settles and collects the coal powder absorbed by the dust collecting hood (4); the ultrafiltration dust collector (6) is connected to a centrifugal fan (7) for driving the dust collecting hood (4) to extract; S3; the pulverized coal in the ultrafiltration dust collector (6) is transported to the solidification mixer (9), and then the composite colloidal solution and the pulverized coal are added to the solidification mixer (9) for stirring and solidification, and the output of the solidification mixer (9) is granular pulverized coal; S4; the granular coal powder output from the solidifying mixer (9) is transported to the coal conveying belt via the scraper conveyor (10) and enters the system coal flow.

2. A dust removal process for an open-pit coal mine crushing station according to claim 1, characterized in that: Two hydraulic cylinders (11) for controlling the upward and downward movement and rotation of the dust collecting hood (4) are fixedly connected to the top of the coal shed (2), and the output ends of the hydraulic cylinders (11) are both rotationally connected to the dust collecting hood (4).

3. A dust removal process for an open-pit coal mine crushing station according to claim 1, characterized in that: A side suction port (12) is provided on the side of the lower end of the coal shed (2), and the side suction port (12) is connected to a second dust collecting hose (13), and the second dust collecting hose (13) is in communication with the first dust collecting hose (5).

4. A dust removal process for an open-pit coal mine crushing station according to claim 3, characterized in that: The inner walls of the first dust collecting hose (5) and the second dust collecting hose (13) are coated with a hydrophobic and wear-resistant coating.

5. A dust removal process for an open-pit coal mine crushing station according to claim 1, characterized in that: An automatic induction electric door (14) is provided at the coal truck entrance (3) of the coal shed (2), a position sensor (15) for detecting the position of the coal truck (1) is installed near the automatic induction electric door (14), and a distance sensor (16) for controlling the opening size of the electric door is installed on the automatic induction electric door (14).

6. A dust removal process for an open-pit coal mine crushing station according to claim 1, characterized in that: The mass ratio of water to colloid in the composite colloid solution is 40-50:1, and the mass ratio of the composite colloid solution to coal powder is 1:10-20.

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