Coal mine underground coal water purification device

Abstract

The present invention provides a coal water purification device for underground coal mines, comprising a crawler-type mobile base with a driving mechanism, a purification device installed on the crawler-type mobile base, the purification device comprising a primary purification component, a secondary purification component, a tertiary purification component and a water pump; the primary purification component comprises a large slag separation bin and a liquid storage bin, and a vibrating screen is arranged at the bottom of the large slag separation bin; the secondary purification component comprises a secondary purification cylinder and a filter screen; the tertiary purification component comprises a tertiary purification box and a stainless steel filter element; the vibrating screen is driven by a variable frequency motor. The present invention can realize the recycling of underground coal water and improve the underground working environment, and can effectively prevent gas from exceeding the limit in the tunnel, and has the advantages of good purification effect, high purification efficiency, energy saving, simple structure, safety and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of mine equipment, and in particular to a coal water purification device in a coal mine. Background Art

[0002] A good working environment is an indispensable condition for underground coal mine operations. At the same time, preventing gas disasters and ensuring safe production in mines cannot be ignored. With the widespread use of hydraulic measures such as hydraulic punching, hydraulic cutting and hydraulic cavitation in gas outburst prevention and coal seam pressure relief and permeability enhancement technology, the discharge of coal-water mixture and the demand for underground clean water are increasing. When hydraulic measures are taken, the coal-water mixture is directly discharged from the borehole into the tunnel without special treatment, resulting in a poor working environment and being relatively dirty. The gas carried in the discharged mixture may also cause the tunnel gas to exceed the limit, posing a great threat to on-site safety production. Therefore, it is a significant task to purify the discharged coal-water mixture in coal mines and recycle it.

[0003] In the prior art, the treatment method for coal-water mixture in coal mines is usually direct discharge, or through separation equipment such as solid-liquid separators, large pieces of coal slag and coal water are simply separated, and then the coal water is discharged. However, the discharged coal water contains a lot of coal slag of different specifications, which cannot be directly used as reserve water for hydraulic burst prevention technology. These separation equipment cannot be adjusted in stages, which will result in a small amount of coal using a high gear or a large amount of coal using a low gear, resulting in energy waste or affecting separation efficiency, and in severe cases, causing equipment blockage. In addition, these devices cannot remove gas from the discharged coal water, which will cause the roadway gas to exceed the limit. In view of this, it is necessary to provide a new coal water purification device for underground coal mines to solve the above technical problems. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a coal water purification device for underground coal mines which has good purification effect, high purification efficiency, energy saving, simple structure, safety and reliability.

[0005] In order to solve the above technical problems, the present invention adopts the following technical scheme: a coal-water purification device for underground coal mines, characterized in that: it comprises a crawler-type mobile base with a driving mechanism, a purification device installed on the crawler-type mobile base, the purification device comprises a primary purification component, a secondary purification component, a tertiary purification component and a water pump which are sequentially connected through pipelines; the primary purification component comprises a large slag separation bin and a liquid storage bin, a vibrating screen is arranged at the bottom of the large slag separation bin, and the liquid storage bin is located below the vibrating screen; a coal-water mixture inlet is arranged at the upper left side of the large slag separation bin, a coal outlet is arranged at the right side, and a gas extraction outlet is arranged at the top; a primary water outlet is arranged at the bottom left side of the liquid storage bin, and a backwash drain outlet is arranged at the bottom right side; the secondary purification component comprises a large slag separation bin and a liquid storage bin, a vibrating screen is arranged at the bottom of the large slag separation bin, and the liquid storage bin is located below the vibrating screen; a coal-water mixture inlet is arranged at the upper left side of the large slag separation bin, a coal outlet is arranged at the right side, and a gas extraction outlet is arranged at the top; a primary water outlet is arranged at the bottom left side of the liquid storage bin, and a backwash drain outlet is arranged at the bottom right side; The assembly includes a secondary purification cylinder and a filter screen located inside the secondary purification cylinder; the secondary purification cylinder is fixed on a crawler-type mobile base by a bracket; the right side of the secondary purification cylinder is connected to the primary water outlet, and the left side is provided with a secondary water outlet; the tertiary purification assembly includes a tertiary purification box, three parallel stainless steel filter elements located inside the tertiary purification box, the right side of the tertiary purification box is connected to the secondary water outlet, and the left side of the tertiary purification box is provided with a tertiary water outlet, and the tertiary water outlet is connected to the water pump through the main water outlet pipeline; the vibrating screen is driven by a variable frequency motor, and a pressure sensor, a signal converter and a variable frequency controller are provided at the bottom of the coal-water mixture inlet, and the variable frequency motor, the pressure sensor, the signal converter and the variable frequency controller are connected by cables.

[0006] Furthermore, the coal outlet is provided with a ventilation and sealing device, which includes a slag discharge barrel and a slag discharge air-sealing fan blade shaft located in the slag discharge barrel. The bottom of the slag discharge barrel is provided with an opening for coal blocks to fall, and the slag discharge air-sealing fan blade shaft is configured to rotate only in a counterclockwise direction.

[0007] Furthermore, the filter screens in the secondary purification cartridge are arranged in two groups side by side, each group of filter screens includes a textile fiber filter screen and two metal screens, and the two metal screens sandwich the textile fiber filter screen in the middle.

[0008] Furthermore, a four-way valve is arranged on both sides of the three-stage purification box, one of which is connected to the secondary water outlet and divides the water outlet of the secondary water outlet into three paths and enters three stainless steel filter elements respectively; the other four-way valve connects the outlet pipes of the three stainless steel filter elements and merges them into the three-stage water outlet.

[0009] Furthermore, the water pump is a forward and reverse pump. During purification, the water pump is set to forward pumping mode to pump coal water out from the third-level water outlet. After purification, the water pump is set to reverse pumping mode to inject water from the outside into the third-level water outlet, and then into the third-level purification box and the second-level purification cylinder to reversely clean the stainless steel filter element and filter screen; the waste residue is discharged from the backwash drain outlet.

[0010] Furthermore, the pore size of the textile fiber filter mesh and the metal mesh is smaller than the pore size of the vibrating screen, and the pore size of the stainless steel filter element is smaller than the pore size of the textile fiber filter mesh and the metal mesh, that is, the filtration accuracy of the filter mesh is higher than that of the vibrating screen, and the filtration accuracy of the stainless steel filter element is higher than that of the filter mesh.

[0011] The present invention has the following beneficial effects:

[0012] 1. The present invention adopts a multi-stage purification method to improve the purification effect. The purified water can be used again for hydraulic measures such as hydraulic punching, hydraulic cutting, hydraulic cavitation, etc., realizing the recycling of water, saving water resources and improving the underground working environment.

[0013] 2. The present invention can extract gas from the coal-water mixture while separating the coal-water mixture, which can effectively prevent the gas in the tunnel from exceeding the limit and avoid the occurrence of safety accidents.

[0014] 3. The present invention can adjust the vibration frequency of the vibrating screen according to the change of the inflow of the coal-water mixture, thereby reducing energy consumption and improving purification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the disassembled structure of the filter screen of the present invention.

[0017] Figure 3 It is a structural schematic diagram of the three-stage purification box of the present invention.

[0018] The corresponding parts names in the figure are: 1 crawler mobile base; 2 large slag separation bin; 3 liquid storage bin; 4 vibrating screen; 5 coal-water mixture inlet; 6 coal outlet; 7 gas extraction outlet; 8 primary water outlet; 9 backwash drain outlet; 10 secondary purification cylinder; 11 filter screen; 12 bracket; 13 secondary water outlet; 14 tertiary purification box; 15 stainless steel filter element; 16 tertiary water outlet; 17 total water outlet pipeline; 18 water pump; 19 pressure sensor; 20 signal converter; 21 frequency conversion controller; 22 slag discharge cylinder; 23 slag discharge air-closed fan shaft; 24 four-way valve; 11-1 textile fiber filter mesh; 11-2 metal mesh. DETAILED DESCRIPTION

[0019] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods, structures and features of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments. However, the accompanying drawings are only provided for reference and explanation, and are not intended to limit the present invention.

[0020] See also Figures 1 to 3As shown, the present invention provides a coal-water purification device for underground coal mines, comprising a crawler-type mobile base 1 with a driving mechanism, and a purification device installed on the crawler-type mobile base, wherein the purification device comprises a primary purification component, a secondary purification component, a tertiary purification component and a water pump 18 which are sequentially connected through pipelines; the primary purification component comprises a large slag separation bin 2 and a liquid storage bin 3, a vibrating screen 4 is arranged at the bottom of the large slag separation bin, and the liquid storage bin is located below the vibrating screen; a coal-water mixture inlet 5 is arranged at the upper left side of the large slag separation bin, a coal outlet 6 is arranged at the right side, and a gas extraction outlet 7 is arranged at the top; a primary water outlet 8 is arranged at the bottom left side of the liquid storage bin, and a backwash drain outlet 9 is arranged at the bottom right side; the secondary purification component comprises a secondary purification cylinder 10, a backwash drain outlet 9 located inside the secondary purification cylinder The filter screen 11; the secondary purification cylinder is fixed on the crawler-type mobile base by a bracket 12; the right side of the secondary purification cylinder is connected to the primary water outlet 8, and the left side is provided with a secondary water outlet 13; the tertiary purification assembly includes a tertiary purification box 14, three parallel stainless steel filter elements 15 located inside the tertiary purification box, the right side of the tertiary purification box is connected to the secondary water outlet 13, and the left side of the tertiary purification box is provided with a tertiary water outlet 16, and the tertiary water outlet is connected to the water pump 18 through the main water outlet pipeline 17; the vibrating screen is driven by a variable frequency motor (not shown), and a pressure sensor 19, a signal converter 20 and a variable frequency controller 21 are provided at the bottom of the coal-water mixture inlet 5, and the variable frequency motor, the pressure sensor, the signal converter and the variable frequency controller are connected by cables. The coal outlet 6 is provided with a ventilation and sealing device, which includes a slag discharge barrel 22 and a slag discharge air-closed fan blade shaft 23 located in the slag discharge barrel. The bottom of the slag discharge barrel 22 is provided with an open opening for coal blocks to fall, and the slag discharge air-closed fan blade shaft is set to rotate only counterclockwise in one direction. The filter screen 11 in the secondary purification barrel adopts two groups of side-by-side arrangements, and each group of filter screens includes a textile fiber filter mesh 11-1 and two metal meshes 11-2, and the two metal meshes sandwich the textile fiber filter mesh in the middle. A four-way valve 24 is respectively arranged on both sides of the three-stage purification box, one of which is connected to the secondary water outlet and divides the water outlet of the secondary water outlet into three ways to enter three stainless steel filter elements respectively; the other four-way valve connects the outlet pipes of the three stainless steel filter elements and merges them into the third-stage water outlet 16. The water pump 18 is a forward and reverse pumping water pump. During purification, the water pump is set to the forward pumping mode to pump out the coal water from the third-level water outlet. After purification, the water pump is set to the reverse pumping mode to inject water from the outside into the third-level water outlet, and then enter the third-level purification box and the second-level purification cylinder to reversely clean the stainless steel filter element and the filter screen; the waste residue is discharged from the backwashing drain port 9. The apertures of the textile fiber filter mesh 11-1 and the metal mesh 11-2 are smaller than the mesh aperture of the vibrating screen 4, and the mesh aperture of the stainless steel filter element 15 is smaller than the aperture of the textile fiber filter mesh and the metal mesh, that is, the filtering accuracy of the filter screen is higher than that of the vibrating screen, and the filtering accuracy of the stainless steel filter element is higher than that of the filter screen.

[0021] The coal-water purification device for underground coal mines based on the above structural design is powered on during the coal-water separation and purification process, and the backwash drain port 9 is in a closed state. When the coal-water mixture enters the coal-water mixture inlet 5, it falls on the pressure sensor 19, and the pressure sensor 19 will feel the pressure of the coal-water mixture. The pressure sensor 19 transmits the pressure signal to the signal converter 20 to convert it into a digital signal and transmit it to the frequency conversion controller 21. At this time, the frequency conversion controller 21 can control the frequency of the frequency conversion motor on the vibrating screen 4 according to the digital signal to achieve frequency conversion vibration. The gas carried in the coal-water mixture is discharged through the gas extraction port 7 on the top of the large slag separation bin 2. Under the vibration of the vibrating screen 4, the larger coal slag remains on the vibrating screen 4, and the water and fine coal slag particles flow into the liquid storage bin 3 under the action of their own gravity. When the water in the liquid storage bin 3 reaches the set water level, the water pump is turned on to provide the necessary negative pressure for the purification of the secondary purification component and the tertiary purification component. The coal-water enters the secondary purification component and the tertiary purification component in turn for solid-liquid separation to achieve coal-water purification. The coal outlet 6 is provided with a ventilation and sealing device. Larger coal slag enters the slag discharge tube 22 at the coal outlet 6 from the vibrating screen 4. The slag discharge air-sealing fan shaft 23 in the slag discharge tube rotates counterclockwise, which can move the coal blocks to fall and prevent the gas in the coal-water mixture from leaking into the tunnel, thereby playing a good coal unloading and sealing role.

[0022] In the middle of the filter screen 11 is a textile fiber filter sheet 11-1, which has high filtering accuracy and is easy to disassemble, wash and replace, but is relatively soft. To ensure that the filter screen is not broken, the textile fiber filter sheet 11-1 is fixed between two metal mesh sheets 11-2. The three stainless steel filter elements 15 in the three-stage purification box 14 are installed in parallel using a four-way valve. The water from the secondary water outlet 13 enters the three-stage purification box 14. In order to improve the purification efficiency, a four-way valve 24 is used to divide the water into three paths, which are respectively transported to the three stainless steel filter elements 15 for purification. The purified three-path water flows then flow out through another four-way valve 24, are discharged through a water pump 18, and are used again in hydraulic measures such as hydraulic punching, hydraulic cutting, and hydraulic cavitation to achieve water recycling.

[0023] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coal water purification device for underground coal mines, characterized in that: It comprises a crawler-type mobile base with a driving mechanism, and a purification device installed on the crawler-type mobile base, wherein the purification device comprises a primary purification component, a secondary purification component, a tertiary purification component and a water pump which are sequentially connected through pipelines; the primary purification component comprises a large slag separation bin and a liquid storage bin, a vibrating screen is arranged at the bottom of the large slag separation bin, and the liquid storage bin is located below the vibrating screen; a coal-water mixture inlet is arranged at the upper left side of the large slag separation bin, a coal outlet is arranged at the right side, and a gas extraction outlet is arranged at the top; a primary water outlet is arranged at the bottom left side of the liquid storage bin, and a backwash outlet is arranged at the bottom right side; the secondary purification component comprises a secondary purification cylinder and a filter screen located in the secondary purification cylinder; the secondary purification cylinder is fixed on the crawler-type mobile base by a bracket; the secondary purification cylinder is connected to the primary water outlet on the right side, and is provided with a Secondary water outlet; the three-stage purification component includes a three-stage purification box, three parallel stainless steel filter elements located inside the three-stage purification box, the right side of the three-stage purification box is connected to the secondary water outlet, and the left side of the three-stage purification box is provided with a three-stage water outlet, and the three-stage water outlet is connected to the water pump through the main water outlet pipeline; the vibrating screen is driven by a variable frequency motor, and a pressure sensor, a signal converter and a variable frequency controller are provided at the bottom of the coal-water mixture inlet, and the variable frequency motor, the pressure sensor, the signal converter and the variable frequency controller are connected by cables; the water pump is a forward and reverse pumping water pump, and during purification, the water pump is set to the forward pumping mode to pump coal and water out of the three-stage water outlet, and after purification, the water pump is set to the reverse pumping mode to inject water from the outside into the three-stage water outlet, and then enter the three-stage purification box and the two-stage purification cylinder to reversely clean the stainless steel filter element and the filter screen; Waste slag is discharged through the backwash drain outlet; the coal outlet is provided with a ventilation and sealing device, which includes a slag discharge barrel and a slag discharge air-sealed fan blade shaft located in the slag discharge barrel, and an opening is provided at the bottom of the slag discharge barrel for coal blocks to fall, and the slag discharge air-sealed fan blade shaft is set to rotate only in a counterclockwise direction.

2. The coal water purification device for underground coal mine according to claim 1, characterized in that: The filter screens in the secondary purification cartridge are arranged in two groups side by side, each group of filter screens includes a textile fiber filter screen and two metal screens, and the two metal screens sandwich the textile fiber filter screen.

3. The coal water purification device for underground coal mine according to claim 1, characterized in that: A four-way valve is arranged on both sides of the three-stage purification box, one of which is connected to the secondary water outlet and divides the water outflow from the secondary water outlet into three paths and enters three stainless steel filter elements respectively; the other four-way valve connects the outlet pipes of the three stainless steel filter elements and merges them into the three-stage water outlet.

4. The coal water purification device for underground coal mines according to claim 2, characterized in that: The pore size of the textile fiber filter mesh and the metal mesh is smaller than that of the vibrating screen, and the pore size of the stainless steel filter element is smaller than that of the textile fiber filter mesh and the metal mesh, that is, the filtering accuracy of the filter is higher than that of the vibrating screen, and the filtering accuracy of the stainless steel filter element is higher than that of the filter mesh.

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