Optimized demisting and dust falling device for return air shaft

Abstract

The utility model discloses an optimized demisting and dust-settling device for a return shaft. The optimized demisting and dust-settling device comprises a frame enclosure structure shaped like a Chinese character'hui ', an airflow pre-uniform distribution system, a circulating water spraying system and a silk screen plate filtering system, wherein the frame enclosure structure surrounds the periphery of an opening of the return shaft. The airflow pre-uniform distribution system comprises an arc-shaped flood control wall (1) and a plate-shaped guide vane (3), the circulating water spraying system comprises polyhedral hollow sphere filler (5), a spray head (6), a water supply pump (11), a water return pump (15), a circulating water pool (21), a drainage ditch (18) and a drainage blind pipe (20), and the silk screen plate filtering system comprises a silk screen filtering plate (10). The mine return air dust removal device can efficiently remove impurities such as residual blasting fume dust in mine return air and reduce water mist carried in damp and hot air flow, is simple in structure, stable in operation, remarkable in effect and easy and convenient to disassemble and clean, and the fine dust removal rate reaches 92%-95% and the water mist removal rate is 80%-85% according to field measurement. And the removal rate of toxic gas and peculiar smell is 75-90%.

Description

Technical Field

[0001] The utility model belongs to the technical field of mine environmental protection equipment, and particularly relates to a demisting and dust reduction device for an underground mine return air shaft. Background Art

[0002] The purpose of underground mine ventilation is to increase oxygen concentration underground and dilute and remove toxic and harmful gases and dust. Fresh air enters from the surface through the intake shaft, exchanging heat and moisture with various heat and moisture sources, such as underground mining equipment, damp surrounding rock, and the oxidizing ore itself. This gradually increases the temperature and relative humidity of the air underground. By the time it reaches the surface wellhead through the mine's return air shaft, the relative humidity approaches saturation. The return air temperature in deep mines can reach 32°C to 32°C, with a relative humidity of 93% to 96%. When the hot and humid air from underground encounters the cool surface air, it condenses and forms mist droplets. Furthermore, the high air volume in the return air shaft allows the mist droplets to be carried by the high-velocity airflow, creating tall columns of water mist. Furthermore, toxic gases such as nitrogen oxides and sulfides, as well as fine dust, remaining in blasting smoke can be carried by the wind and dispersed into nearby residential areas.

[0003] Residents often mistake the white mist and odor rising from wellheads for "smoke" emitted by burning hazardous substances underground, causing panic and leading to repeated complaints to the Environmental Protection Bureau. Especially in underground mines near cities, the constant "white smoke" rising from the mines during winter creates severe visual pollution, impacting the city's appearance and image. Some local governments have urged mining companies to proactively address this issue, requiring them to implement appropriate technical measures to completely eliminate the "white smoke" phenomenon.

[0004] In addition, the fine dust, toxic gases, water mist droplets and odor carried in the return air flow of underground mines also pollute the environment and have adverse effects on the health of surrounding residents. Summary of the Invention

[0005] The purpose of this utility model is to solve the problem of white smoke appearing in the return air shaft of underground mines in winter, and the problem that the fine dust, toxic gases, water mist droplets and odor carried in the return air flow pollute the environment and have an adverse effect on the health of surrounding residents. An optimized return air shaft demisting and dust reduction device is provided, which can efficiently remove the fine dust, toxic gases, water mist droplets and odor carried in the return air flow.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solutions for an optimized return air shaft demisting and dust reduction device:

[0007] This utility model discloses an optimized return air shaft demisting and dust reduction device, comprising a U-shaped frame enclosure structure surrounding the return air shaft opening. The U-shaped frame enclosure structure comprises an arc-shaped sealing top cover at the top and a steel support wall composed of two layers, inner and outer, surrounding the return air shaft opening. The U-shaped frame enclosure restricts the airflow path, increasing the water-air contact area and prolonging the contact time. It also features an airflow pre-distribution system, a circulating water spray system, and a wire mesh filtration system.

[0008] The airflow pre-distribution system includes a curved flood control wall and plate-type guide vanes. The lower portion of the curved flood control wall is vertically installed on the ground between the inner wall of the U-shaped frame enclosure and the return air shaft opening. The plate-type guide vanes are installed on the lower inner wall of the U-shaped frame enclosure. The airflow pre-distribution system evens out the airflow, reduces air velocity, and intercepts and filters coarse particles carried in the airflow.

[0009] Grille support plates are respectively provided in the middle and upper parts between the inner and outer walls of the U-shaped frame enclosure structure. The grille support plates are fixed to the inner and outer walls of the U-shaped frame enclosure structure through steel supports and corbel supports.

[0010] The circulating water spray system includes multi-faceted hollow ball fillers, nozzles, a water supply pump, a return pump, a circulating water pool, a drainage ditch, and a drainage blind pipe. The multi-faceted hollow ball fillers are mounted on a grille support plate located in the middle between the inner and outer walls of the "U"-shaped frame enclosure. The nozzles are mounted above the multi-faceted hollow ball fillers and are connected to a water supply pump located outside the "U"-shaped frame enclosure via a water supply pipe. The water supply pump is connected to the circulating water pool via a water supply pipe. The circulating water pool is also connected to a return pipe equipped with a return pump. The return pipe inlet of the return pump is connected to a drainage blind pipe, which is connected to a drainage ditch for collecting and absorbing impurity spray water. The circulating water spray system is used to remove fine dust, residual gun smoke, and odors contained in the airflow, while also washing and cooling the airflow, reducing the temperature difference with the outside atmosphere, and reducing the amount of water mist generated.

[0011] The wire mesh filter system includes a wire mesh filter plate, which is arranged on a grille support plate located above the inner and outer walls of the U-shaped frame enclosure. The wire mesh filter system is used to remove water mist from the airflow and perform secondary purification of fine dust.

[0012] Preferably, an electromagnetic regulating valve and a pressure gauge are sequentially provided on the water supply pipe between the nozzle and the water supply pump.

[0013] Preferably, a ball valve is provided on the return pipe connecting the return pump and the circulating water tank.

[0014] Preferably, the circulating water pool is a semi-underground structure, a float-type liquid level gauge is installed in the circulating water pool, and a water supply pipe is provided on the side wall of the circulating water pool, which can automatically replenish water according to the change of the float liquid level; a sewage pipe is provided at the lower part of the side wall of the circulating water pool for regularly discharging accumulated sludge water.

[0015] Preferably, the corbel support is welded and fixed to the steel support wall; the vertical angle of the plate-type guide blade is 45° to 60°, and the plate spacing is 300 to 500 mm; the ball diameter of the multi-faceted hollow ball filler is Ф32mm to Ф50mm, and the stacking height is 1.2 to 1.5m; the mesh size of the wire mesh filter plate is 60% to 75% of the ball diameter.

[0016] Preferably, the thickness of the wire mesh filter plate is 150 to 200 mm; and the atomization angle of the nozzle is 60 to 90°.

[0017] The utility model discloses an optimized return air shaft demisting and dust reduction device which adopts the above technical solution, and has the following beneficial effects:

[0018] (1) The return air shaft demisting and dust reduction device consists of a "U"-shaped frame enclosure structure, an airflow pre-distribution system, a circulating water spray system, and a wire mesh filter system. It can effectively remove fine dust, toxic gases, water mist droplets, and odors carried in the return air flow. Field measurements have shown that the fine dust removal rate is 92% to 95%, and the water mist removal rate is 80% to 85%. The toxic gas and odor removal rates are 75% to 90%. If alkaline solution is added to the circulating water pool, the removal rate can reach 100%.

[0019] (2) The air flow is evenly organized and the operating resistance is low. It has been measured that the total return air volume in the well is reduced by 2% to 5%. The equipment has low energy consumption, the spraying water is recycled, the energy medium demand is small, and the amount of sewage and wastewater discharged is small.

[0020] (3) Simple structure, stable operation, good technical and economic performance, easy maintenance, long service life of the filter device, and easy cleaning and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the exterior structure of an optimized return air shaft demisting and dust reduction device of the utility model;

[0022] Figure 2 for Figure 1 AA cross-sectional structural diagram;

[0023] Figure 3 for Figure 1 BB cross-sectional structural diagram;

[0024] Figure 4 for Figure 1Schematic diagram of CC cross-section structure.

[0025] The accompanying drawings are marked as follows: 1-arc-shaped flood control wall; 2-arc-shaped sealing top cover; 3-plate-type guide blades; 4-steel support wall; 5-multi-faceted hollow ball filler; 6-nozzle; 7-corbel support; 8-steel support; 9-grating support plate; 10-wire mesh filter plate; 11-water supply pump; 12-electromagnetic regulating valve; 13-pressure gauge; 14-ball valve; 15-return water pump; 16-water supply pipe; 17-sewage pipe; 18-drainage ditch; 19-floor drain; 20-drainage blind pipe; 21-circulating water pool; 22-color steel tile. DETAILED DESCRIPTION

[0026] To further illustrate the present invention, the following describes an optimized return air shaft demisting and dust reduction device in more detail, with reference to the accompanying drawings. Obviously, the embodiments described herein represent only a portion of the present invention, and not all of its embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments herein without inventive effort are considered within the scope of protection of the present invention.

[0027] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 This utility model discloses an optimized return air shaft demisting and dust reduction device, comprising a U-shaped frame enclosure structure surrounding the return air shaft opening, an airflow pre-distribution system, a circulating water spray system, and a wire mesh filter system. The U-shaped frame enclosure structure includes a curved sealing top cover 2 at the top, and a two-layer steel support wall 4 surrounding the return air shaft opening. The steel support wall 4 is covered with colored steel tiles 22, and the steel structure above the steel support wall 4 is treated with anti-corrosion to extend its service life.

[0028] The airflow pre-distribution system includes a curved flood control wall 1 and plate-type guide vanes 3. The lower portion of the curved flood control wall 1 is vertically positioned on the ground between the inner wall of the U-shaped frame enclosure and the return air shaft opening. The plate-type guide vanes 3 are mounted on the lower inner wall of the U-shaped frame enclosure. The plate-type guide vanes 3 have a vertical angle of 45° to 60°, and the spacing between the vanes is 300 to 500 mm. After the dust-laden air is discharged from the return air shaft, it passes through the plate-type guide vanes 3, which evens out the airflow, reduces its velocity, and intercepts and filters coarse particles carried in the airflow. The flood control wall prevents external debris and surface water from entering the return air shaft.

[0029] Grille support plates 9 are respectively provided in the middle and upper parts between the inner and outer walls of the U-shaped frame enclosure structure. The grille support plates 9 are fixed to the inner and outer walls of the U-shaped frame enclosure structure through steel support plates 8 and corbel supports 7; the corbel supports 7 are welded and fixed to the steel support enclosure walls 4.

[0030] The circulating water spray system includes a polyhedral hollow ball filler 5, a nozzle 6, a water supply pump 11, a return water pump 15, a circulating water pool 21, a drain ditch 18, and a drainage blind pipe 20. An electromagnetic regulating valve 12 and a pressure gauge 13 are sequentially provided on the water supply pipe between the nozzle 6 and the water supply pump 11. The electromagnetic regulating valve 12 is used to cut off the water supply pipeline and adjust the flow and pressure of the nozzle 6. The pressure gauge 13 displays the water supply pressure of the pipeline; the polyhedral hollow ball filler 5 is placed on a grid support plate 9 provided in the middle between the inner and outer walls of the "U"-shaped frame enclosure structure. The ball diameter of the polyhedral hollow ball filler 5 is Ф32mm~Ф50mm, and the stacking height is 1.2~1.5m. The polyhedral hollow ball filler 5 has the characteristics of large gas-liquid contact area and small resistance, and is generally made of polypropylene; the nozzle 6 is installed above the polyhedral hollow ball filler 5, and the nozzle 6 The atomization angle is 60 to 90 degrees. The nozzle 6 is connected to the water supply pump 11 located outside the "U"-shaped frame enclosure structure through a water supply pipe. The water supply pump 11 is connected to the circulating water pool 21 through a water supply pipe; the circulating water pool 21 is also connected to the return pipe, on which a return pump 15 is provided. A ball valve 14 is provided on the return pipe connecting the return pump 15 and the circulating water pool 21. The ball valve 14 is used to cut off the circulating return water pipeline; the return pipe inlet of the return pump 15 is connected to a drainage blind pipe 20, which is connected to a drainage ditch 18 for collecting and absorbing impurity spray water; the circulating water pool 21 is a semi-underground structure, and a float-type liquid level gauge is installed in the circulating water pool 21; a water supply pipe 16 is provided on the side wall of the circulating water pool 21, and a sewage pipe 17 for regularly discharging accumulated sludge water is provided at the lower part of the side wall of the circulating water pool 21. After passing through the plate-shaped guide vanes 3, the uniform airflow flows upward through the circulating spray tower. This reverse gas-liquid interaction cleans and cools the contaminated return air, removing any fine dust and residual blasting smoke carried by the return air while also reducing the amount of mist entrained in the airflow. The spray water, pressurized by the water supply pump 11, is sprayed downward through the nozzle 6, moistening the surface of the hollow sphere packing. The circulating spray tower packing is composed of polyhedral hollow spheres, offering a large airflow contact area, low resistance, and corrosion resistance. The return airflow fluidizes the system.

[0031] The wire mesh plate filtration system includes a wire mesh filter plate 10, which is arranged on a grille support plate 9 provided at the upper part between the inner and outer walls of the "U"-shaped frame enclosure structure; the thickness of the wire mesh filter plate 10 is 150 to 200 mm; the mesh size of the wire mesh filter plate 10 is 60% to 75% of the ball diameter of the polyhedral hollow ball filler 5.

[0032] The airflow pre-distribution system described in the present invention makes the airflow organized evenly, and at the same time intercepts and filters the coarse particles carried in the airflow; the circulating water spray system is used to remove the fine dust, residual gun smoke and odor contained in the airflow, and at the same time washes and cools the airflow to reduce the temperature difference with the outside atmosphere; the wire mesh plate filtration system removes water mist mixed in the airflow, and the "U"-shaped frame enclosure structure limits the airflow path, increases the water vapor contact area, and prolongs the contact time.

[0033] The spray water is recycled. The impurity-absorbing spray water is collected along the ground slope and drained into a drainage ditch 18, with a slope of preferably 1.5% to 3%. It then flows into a blind drain pipe 20, where it is pressurized by a return pump 15 and sent to a circulating water tank 21. The blind drain pipe should have a diameter of DN180mm to DN250mm, and a floor drain 19 installed at the top to filter debris such as leaves and plastic to prevent clogging. The circulating water tank 21 is equipped with a float-type level gauge and a water supply pipe 16 installed on its sidewall, automatically replenishing the water based on the float level. A sewage pipe 17 is used to regularly drain any accumulated sludge. The circulating water tank 21 is semi-underground, with a capacity designed to accommodate 65% to 85% of the daily circulating water volume. The airflow, after being sprayed, passes through a wire mesh filter 10 again. The wire mesh filter 10 is composed of a fine-porous filter material woven from multiple strands of metal mesh to further remove water mist and fine dust impurities from the airflow. The wire mesh filter plate 10 is prefabricated in the factory and assembled on site, and is placed on the grille support plate 9 located in the lower middle part; the grille support 9 and the steel support 8 are installed at the lower part of the wire mesh filter plate 10, and the steel support is placed on the corbel 6. The corbel is welded and fixed to the steel column 4, providing stable support while facilitating installation and disassembly.

[0034] Among them, the "U"-shaped frame enclosure structure includes an arc-shaped sealing top cover 2, a steel support wall 4 and an outer colored steel tile 22, which is used to limit the air flow movement path and increase the gas-liquid contact area. All steel structures are treated with anti-corrosion to extend their service life.

[0035] In summary, the optimized return air shaft demisting and dust reduction device provided by this utility model can efficiently remove residual blasting smoke and dust in mine return air, and can also reduce water mist in hot and humid airflow. It has a simple structure, stable operation, significant effect, good technical and economical efficiency, and is easy to disassemble and clean. The actual application results of the return air shafts of Baowu Resources Meishan Iron Mine and Zhongjiu Iron Mine show that this process has reliable performance, significant results, stable operation, and mature technology.

[0036] It should be noted that, in this article, terms such as upper, middle, and middle lower are for ease of description, and the "middle" is not necessarily the middle; relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0037] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An optimized return air shaft demisting and dust reduction device, comprising a U-shaped frame enclosure structure surrounding the return air shaft opening, the U-shaped frame enclosure structure comprising an arc-shaped sealing top cover (2) at the top, and a steel support wall (4) located around the return air shaft opening and consisting of an inner and outer layer; characterized in that: It also includes airflow pre-distribution system, circulating water spray system, and wire mesh plate filtration system; The airflow pre-distribution system comprises an arc-shaped flood-proof wall (1) and a plate-shaped guide vane (3); the lower portion of the arc-shaped flood-proof wall (1) is vertically arranged on the ground between the inner wall of the "U"-shaped frame enclosure structure and the return air shaft opening, and the plate-shaped guide vane (3) is arranged on the inner wall of the lower portion of the "U"-shaped frame enclosure structure; A grille support plate (9) is provided in the middle and upper parts between the inner and outer walls of the U-shaped frame enclosure structure, respectively. The grille support plate (9) is fixed to the inner and outer walls of the U-shaped frame enclosure structure through a steel support (8) and a corbel support (7). The circulating water spraying system comprises a polyhedral hollow ball filler (5), a nozzle (6), a water supply pump (11), a return water pump (15), a circulating water pool (21), a drainage ditch (18), and a drainage blind pipe (20); the polyhedral hollow ball filler (5) is placed on a grid support plate (9) provided in the middle between the inner and outer walls of the "U"-shaped frame enclosure structure; the nozzle (6) is installed on the polyhedral hollow ball filler (5); the nozzle (6) is connected to the water supply pump (11) located outside the "U"-shaped frame enclosure structure through a water supply pipe; the water supply pump (11) is connected to the circulating water pool (21) through a water supply pipe; the circulating water pool (21) is also connected to a return water pipe, a return water pump (15) is provided on the return water pipe, the return water pipe inlet of the return water pump (15) is connected to the drainage blind pipe (20), and the drainage blind pipe (20) is connected to a drainage ditch (18) for collecting and absorbing impurity spray water; The wire mesh plate filtering system comprises a wire mesh filter plate (10), which is arranged on a grid support plate (9) provided on the upper portion between the inner and outer walls of a "U"-shaped frame enclosure structure.

2. The optimized return air shaft demisting and dust reduction device according to claim 1, characterized in that: An electromagnetic regulating valve (12) and a pressure gauge (13) are sequentially provided on the water supply pipe between the nozzle (6) and the water supply pump (11).

3. The optimized return air shaft demisting and dust reduction device according to claim 1, characterized in that: A ball valve (14) is provided on a return water pipe connecting the return water pump (15) and the circulating water pool (21).

4. The optimized return air shaft demisting and dust reduction device according to claim 1, characterized in that: The circulating water pool (21) is a semi-underground structure, and a float type liquid level meter is installed in the circulating water pool (21).

5. The optimized return air shaft demisting and dust reduction device according to claim 1, 2, 3 or 4, characterized in that: A water supply pipe (16) is provided on the side wall of the circulating water pool (21), and a sewage pipe (17) for regularly discharging silted water is provided at the lower part of the side wall of the circulating water pool (21).

6. The optimized return air shaft demisting and dust reduction device according to claim 5, characterized in that: The corbel support (7) is welded and fixed to the steel support wall (4).

7. The optimized return air shaft demisting and dust reduction device according to claim 6, characterized in that: The vertical angle of the plate-shaped guide blades (3) is 45° to 60°, and the distance between the plates is 300 to 500 mm.

8. The optimized return air shaft demisting and dust reduction device according to claim 7, characterized in that: The multifaceted hollow ball filler (5) has a ball diameter of 32mm to 50mm and a stacking height of 1.2 to 1.5m; the mesh size of the wire mesh filter plate (10) is 60% to 75% of the ball diameter.

9. The optimized return air shaft demisting and dust reduction device according to claim 8, characterized in that: The thickness of the wire mesh filter plate (10) is 150-200 mm.

10. The optimized return air shaft demisting and dust reduction device according to claim 2, characterized in that: A ball valve (14) is provided on the return pipe connecting the return pump (15) and the circulating water pool (21); the circulating water pool (21) is a semi-underground structure, and a float type liquid level gauge is installed in the circulating water pool (21); a water supply pipe (16) is provided on one side of the circulating water pool (21), and a sewage pipe (17) for regularly discharging silted water is provided on the lower part of one side of the circulating water pool (21); the bracket support (7) is welded and fixed to the steel support wall (4) ; The vertical angle of the plate-type guide blade (3) is 45°~60°, and the plate spacing is 300~500mm; the ball diameter of the multi-faceted hollow ball filler (5) is Ф32mm~Ф50mm, and the stacking height is 1.2~1.5m; the mesh size of the wire mesh filter plate (10) is 60%~75% of the ball diameter; the thickness of the wire mesh filter plate (10) is 150~200mm; the atomization angle of the nozzle (6) is 60~90°.

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