Dust suppression liquid, dust suppression system and dust suppression method integrating active capture, moisturizing and coagulation

Abstract

The present invention discloses a dust suppression liquid that integrates active capture, moisturizing and coagulation, which is used for dust reduction in coal mines. The dust suppression liquid is a composite solution formed by dissolving alum, sulfite and potassium permanganate in water, wherein the mass concentration of alum is 0.02%-0.2%, the mass concentration of sulfite is 0.01%-1%, and the mass concentration of potassium permanganate is 0.01%-1%. The present invention also discloses a dust suppression system and a dust suppression method using the dust suppression liquid that integrates active capture, moisturizing and coagulation. The present invention can generate positive electricity in the dust suppression liquid, increase the positive charge of aluminum hydroxide colloid, and then enhance the ability of droplets and aluminum hydroxide colloid to capture and adsorb coal dust particles, and enhance the coagulation phenomenon by in-situ improving the wettability of coal dust, further improving the effect of gravity sedimentation, thereby achieving efficient and rapid dust removal.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine operation, in particular to a coal dust prevention and control technology in underground coal mines. Background Art

[0002] The dust problem in coal mining faces is becoming increasingly serious, especially with the increasing level of mechanization and automation in mines, the intensity of coal seam gas extraction is also increasing, resulting in more dry coal loss, and a greater amount of floating coal generated by dust sources such as comprehensive excavation, comprehensive mining, and frame transfer. The dust generated by the mining face accounts for more than 85% of all mine dust;

[0003] In the case of no dust control measures taken in the fully mechanized mining face, the dust concentration is as high as 1500mg / m 3 -2500mg / m 3 , which is more than 5,000 times the level of serious ground air pollution. Even if relevant measures are taken, it is difficult to change the harsh conditions of the mine environment.

[0004] Coal mine dust can cause coal dust explosions and pneumoconiosis. In order to control seriously excessive floating coal, dust mist condensation and wet dust reduction and chemical dust suppressants are often used. The dust reduction mechanism relies on the flow, collision and wetting of droplet particles to achieve coal dust sedimentation. They all capture coal dust passively and randomly, ignoring the fact that the contact time between dust particles and water droplets is an important factor affecting the wetting effect of coal dust. They can only affect the migration, escape and wettability of dust to a certain extent, and there are problems such as poor dust reduction effect.

[0005] As the coal industry has higher and higher requirements for the dust suppression ability of chemical dust suppressants, more dust suppressants and their combination with wet dust removal technologies have appeared in the existing technology, but they all start from reducing the surface tension of water, increasing the affinity of water for coal dust, and increasing the probability of dust being wetted, while ignoring the inherent physical and chemical properties of coal dust such as surface wettability, resulting in little effect. Therefore, the existing dust control technology needs to be further improved and developed. Summary of the invention

[0006] The object of the present invention is to provide a dust reduction liquid which integrates active capture, moisturizing and coagulation, and can enhance the capture, moisturizing and coagulation performance of coal dust particles and improve the dust reduction effect.

[0007] To achieve the above purpose, the dust reduction liquid integrating active capture, moisturizing and coagulation of the present invention is used for dust reduction in coal mines. The dust reduction liquid is a composite solution formed by dissolving alum, sulfite and potassium permanganate in water, wherein the mass concentration of alum is 0.02%-0.2%, the mass concentration of sulfite is 0.01%-1%, and the mass concentration of potassium permanganate is 0.01%-1%.

[0008] The sulfite is one or more of sodium sulfite, sodium bisulfite, potassium sulfite and potassium bisulfite.

[0009] The present invention also discloses a dust suppression system using the dust suppression liquid integrating active capture, moisturizing and condensing, comprising a water tank containing the dust suppression liquid integrating active capture, moisturizing and condensing;

[0010] The water tank is connected with an inlet pipe and an outlet pipe. The inlet pipe is used to connect to the underground water supply system and obtain water source; the outlet pipe is connected to the water inlet of the water supply pump, and the water outlet of the water supply pump is connected to the water inlet of the booster pump through a connecting pipeline. The water outlet of the booster pump is connected in parallel with a number of nozzles, which are used to spray dust suppression liquid to the dust generating points. The aperture of the nozzle is 2-3 mm, and the pressure at the nozzle is 1-2 MPa;

[0011] A sieve plate is provided in the water tank at the lower middle part, on which water holes and electrodes are arranged in an array. The water holes and electrodes are arranged alternately, and the electrodes are conductively connected to each other through wires. An electrostatic generator is provided outside the water tank, and the positive pole of the electrostatic generator is connected to the electrodes through wires.

[0012] The water inlet pipe is provided with a water inlet valve, the water outlet pipe is provided with a water outlet valve, and the connecting pipeline is provided with a third valve.

[0013] The present invention also discloses a dust reduction method using the dust reduction system, which is performed in the following steps:

[0014] The dust suppression liquid that integrates active capture, moistening and condensation is referred to as dust suppression liquid;

[0015] The first step is to add water, fill the water tank;

[0016] The second step is to add reagents, add alum, sulfite and potassium permanganate into the water tank, stir evenly, make the mass concentration of alum be 0.02%-0.2%, the mass concentration of sulfite be 0.01%-1%, and the mass concentration of potassium permanganate be 0.01%-1%, so as to form the dust reduction liquid; after alum is dissolved in water, aluminum hydroxide colloid with strong adsorption and positive charge is formed;

[0017] The third step is to start the electrostatic generator, and each electrode on the sieve plate connected to the positive electrode of the electrostatic generator absorbs negative ions in the dust-removing liquid, so that the dust-removing liquid has a trace positive charge and increases the positive charge of the aluminum hydroxide colloid;

[0018] The fourth step is to start the water supply pump and the booster pump. After the dust suppression liquid is pressurized by the water supply pump and the booster pump at two stages, it is sprayed toward the dust generating points through each nozzle at a pressure of 1-2MPa.

[0019] The dust generating points include the frame moving place, coal cutting place and coal discharge port of the fully mechanized mining face.

[0020] The electrode includes an insulating base and a metal conductive part connected to the insulating base, the upper end of the metal conductive part extends upward from the insulating base, the lower end of the metal conductive part extends downward from the insulating base, and the ends of the metal conductive part extending from the insulating base are both arrow-shaped with the tips facing away from the insulating base.

[0021] The dust suppression liquid of the present invention has the following advantages:

[0022] 1. Alum is dissolved in water to generate aluminum hydroxide colloid with strong adsorption and positive charge. Aluminum hydroxide colloid can enhance the ability of droplets to capture and adsorb coal dust particles during the spraying process of the nozzle.

[0023] 2. The non-complexed trivalent manganese produced by the reaction of sulfite and potassium permanganate in the droplets can improve the surface wettability of coal dust within a millisecond time scale, greatly increase the water absorption of coal dust, and prompt the coal dust to absorb more water in the droplets.

[0024] 3. Liquid droplets and their aluminum hydroxide colloids can agglomerate with coal dust particles, thereby promoting gravity sedimentation and improving dust removal effects.

[0025] The dust reduction system of the present invention can generate positive electricity in the dust reduction liquid, increase the positive charge of the aluminum hydroxide colloid, and further enhance the ability of the droplets and the aluminum hydroxide colloid to capture and adsorb coal dust particles, and enhance the coagulation phenomenon by improving the wettability of the coal dust in situ, thereby further improving the effect of gravity sedimentation, thereby achieving efficient and rapid dust removal.

[0026] Using the dust reduction method of the present invention, the droplets of the dust reduction liquid with positive charge and the aluminum hydroxide colloid with positive charge capture and adsorb the coal dust particles with negative charge during the spraying process;

[0027] Then the coal dust particles and the droplets complete a chemical reaction within a millisecond time scale. The non-complexed trivalent manganese produced by the reaction of sulfite and potassium permanganate in the droplets improves the wettability of the coal dust surface within a millisecond time scale, greatly increasing the water absorption of the coal dust and prompting the coal dust to absorb more water in the droplets.

[0028] The wetted coal dust particles agglomerate with the droplets and aluminum hydroxide colloid and then settle by gravity, achieving a rapid and efficient dust suppression effect.

[0029] The technical solution of the present invention has lower requirements on water supply pressure and nozzle aperture. The water supply pressure is reduced from 6-12MPa in the prior art to 1-2MPa, and the nozzle aperture is increased from 0.8-1.2mm in the prior art to 2-3mm, thereby reducing the danger (low pressure) and energy consumption of dust reduction operations, saving water, and avoiding frequent clogging and wear of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is a structural schematic diagram of the dust suppression system of the present invention;

[0031] Figure 2 yes Figure 1 Schematic diagram of the top view of the middle sieve plate;

[0032] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle electrode. DETAILED DESCRIPTION

[0033] The dust suppression liquid integrating active capture, moistening and coagulation of the present invention is used for dust suppression in coal mines. The dust suppression liquid is a composite solution formed by dissolving alum, sulfite and potassium permanganate in water, wherein the mass concentration of alum is 0.02%-0.2%, the mass concentration of sulfite is 0.01%-1%, and the mass concentration of potassium permanganate is 0.01%-1%. The above numerical ranges all include the two end values.

[0034] The sulfite is one or more of sodium sulfite, sodium bisulfite, potassium sulfite and potassium bisulfite.

[0035] like Figures 1 to 3 As shown, the present invention also discloses a dust suppression system using the dust suppression liquid integrating active capture, moisturizing and condensing, comprising a water tank 2, in which the dust suppression liquid integrating active capture, moisturizing and condensing is contained;

[0036] The water tank 2 is connected to a water inlet pipe 12 and a water outlet pipe 10. The water inlet pipe 12 is used to connect to the underground water supply system (such as a water supply pipe) and obtain water; the water outlet pipe 10 is connected to the water inlet of the water supply pump 4, and the water outlet of the water supply pump 4 is connected to the water inlet of the booster pump 6 through a connecting pipe 11. The water outlet of the booster pump 6 is connected in parallel with a plurality of nozzles 7. The nozzles 7 are used to spray dust suppression liquid onto dust-producing points. The aperture of the nozzles 7 is 2-3 mm, and the pressure at the nozzles 7 is 1-2 MPa. The above numerical ranges include both end values.

[0037] A sieve plate 8 is provided in the water tank 2, which is located in the middle and lower part of the water tank 2 (so as to ensure that it is below the water level) (the sieve plate 8 is preferably arranged horizontally), and water holes 82 and electrodes 81 are arranged in an array on the sieve plate 8. The water holes 82 and the electrodes 81 are arranged in an alternating manner, and the electrodes 81 are electrically connected to each other through wires; an electrostatic generator 9 is provided outside the water tank 2, and the positive electrode of the electrostatic generator 9 is connected to the electrodes 81 through wires. The electrode 81 includes an insulating base and a metal conductive part 811 connected to the insulating base 812, and the insulating base 812 is used to be embedded in the sieve plate 8.

[0038] The upper end of the metal conductive part 811 extends upward from the insulating base 812, and the lower end of the metal conductive part 811 extends downward from the insulating base 812. The ends of the metal conductive part 811 extending from the insulating base 812 are both arrow-shaped with the tip pointing away from the insulating base 812, which can better absorb negative ions in the dust reduction liquid.

[0039] The water inlet pipe 12 is provided with a water inlet valve 1 , the water outlet pipe 10 is provided with a water outlet valve 3 , and the connecting pipeline 11 is provided with a third valve 5 .

[0040] The present invention also discloses a dust reduction method using the dust reduction system, which is performed in the following steps:

[0041] The dust suppression liquid that integrates active capture, moistening and condensation is referred to as dust suppression liquid;

[0042] The first step is to add water, fill the water tank 2 with water;

[0043] The second step is to add reagents, add alum, sulfite and potassium permanganate into the water tank 2, stir evenly, make the mass concentration of alum be 0.02%-0.2%, the mass concentration of sulfite be 0.01%-1%, and the mass concentration of potassium permanganate be 0.01%-1%, and form the dust reduction liquid; the above numerical ranges include both end values. Alum is dissolved in water to form aluminum hydroxide colloid with strong adsorption and positive charge;

[0044] The third step is to start the electrostatic generator 9. The electrodes 81 on the sieve plate 8 connected to the positive electrode of the electrostatic generator 9 adsorb the negative ions in the dust-removing liquid, so that the dust-removing liquid has a trace positive charge, increasing the positive charge of the aluminum hydroxide colloid.

[0045] The fourth step is to start the water supply pump 4 and the booster pump 6. After the dust suppression liquid is pressurized by the water supply pump 4 and the booster pump 6, it is sprayed toward the dust generating point through each nozzle 7 at a pressure of 1-2 MPa.

[0046] Using the dust reduction method of the present invention, the droplets of the dust reduction liquid with positive charge and the aluminum hydroxide colloid with positive charge capture and adsorb the coal dust particles with negative charge during the spraying process;

[0047] Then the coal dust particles and the droplets complete a chemical reaction within a millisecond time scale. The non-complexed trivalent manganese produced by the reaction of sulfite and potassium permanganate in the droplets improves the wettability of the coal dust surface within a millisecond time scale, greatly increasing the water absorption of the coal dust and prompting the coal dust to absorb more water in the droplets.

[0048] The wetted coal dust particles agglomerate with the droplets and aluminum hydroxide colloid and then settle by gravity, achieving a rapid and efficient dust suppression effect.

[0049] The dust generating points include the frame moving place, coal cutting place and coal discharge port of the fully mechanized mining face.

[0050] By adopting the present invention, after spraying dust reduction at the three main dust-producing points of the comprehensive mining working face, namely the frame moving point, coal cutting point and coal discharge port, the overall dust reduction rate is significantly improved compared with the conventional spray dust reduction effect, and the dust reduction rate reaches more than 90%, which is a great improvement compared with the existing technology.

[0051] Embodiment 1

[0052] In this embodiment, the mass concentrations of alum, sulfite and potassium permanganate in the dust suppression liquid are 0.02%, 0.02% and 0.01% respectively.

[0053] Embodiment 2

[0054] In this embodiment, the mass concentrations of alum, sulfite and potassium permanganate in the dust suppression liquid are 0.08%, 0.8% and 0.5%, respectively.

[0055] Embodiment 3

[0056] In this embodiment, the mass concentrations of alum, sulfite and potassium permanganate in the dust suppression liquid are 0.2%, 1% and 0.8% respectively.

[0057] The dust suppression liquids in Examples 1 to 3 were used to conduct spray tests on site, and the dust concentrations in the fully mechanized mining face without any dust suppression measures and after the three examples of the present invention were measured, as shown in Table 1.

[0058] Table 1 shows the dust data measured at various locations in the fully mechanized mining face when different measures were adopted.

[0059] Table 1:

[0060]

[0061] As can be seen from Table 1, after spraying dust reduction at the three main dust-producing points of the fully mechanized mining face, namely, the frame moving point, the coal cutting point and the coal discharge point, the total dust reduction rate is significantly improved compared with the conventional spray dust reduction effect, and the dust reduction rate reaches more than 90%, which is a great improvement compared with the existing technology.

[0062] The analysis shows that: (1) after alum is dissolved in water, aluminum hydroxide colloid with strong adsorption and positive charge is generated. The electrode 81 connected to the positive electrode of the electrostatic generator 9 can adsorb some negative ions in the dust suppression liquid, so that the sprayed droplets have a trace positive charge, further increasing the positive charge of the aluminum hydroxide colloid; (2) the positively charged colloid can actively capture the coal dust particles with a large amount of negative charge generated at the dust generating point after being sprayed with the droplets; (3) the non-complexed trivalent manganese produced by the reaction of sulfite and potassium permanganate in the droplets can improve the wettability of the coal dust surface within a millisecond time scale, greatly improve the water absorption of the coal dust, and prompt the coal dust to absorb more water in the droplets; (4) the wetted coal dust particles condense with the droplets and colloids and settle by gravity, which plays a rapid and efficient dust suppression role.

[0063] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A dust suppression liquid that integrates active capture, moistening and coagulation, used for dust reduction in coal mines, characterized by: The dust reduction liquid is a composite solution formed by alum, sulfite and potassium permanganate dissolved in water. The mass concentration of alum is 0.02%-0.2%, the mass concentration of sulfite is 0.01%-1%, and the mass concentration of potassium permanganate is 0.01%-1%. The non-complexed trivalent manganese produced by the reaction of sulfite and potassium permanganate is used to improve the wettability of the coal dust surface within a millisecond time scale.

2. The dust suppression liquid integrating active capture, moistening and coagulation according to claim 1 is characterized in that: The sulfite is one or more of sodium sulfite, sodium bisulfite, potassium sulfite and potassium bisulfite.

3. A dust suppression system using the dust suppression liquid integrating active capture, moisturizing and coagulation as claimed in claim 1 or 2, characterized in that: It includes a water tank, in which the dust suppression liquid integrating active capture, moistening and condensation is contained; The water tank is connected with an inlet pipe and an outlet pipe. The inlet pipe is used to connect to the underground water supply system and obtain water source; the outlet pipe is connected to the water inlet of the water supply pump, and the water outlet of the water supply pump is connected to the water inlet of the booster pump through a connecting pipeline. The water outlet of the booster pump is connected in parallel with a number of nozzles, which are used to spray dust suppression liquid to the dust generating points. The aperture of the nozzle is 2-3 mm, and the pressure at the nozzle is 1-2 MPa; A sieve plate is provided in the water tank at the lower middle part, on which water holes and electrodes are arranged in an array. The water holes and electrodes are arranged alternately, and the electrodes are conductively connected to each other through wires. An electrostatic generator is provided outside the water tank, and the positive pole of the electrostatic generator is connected to the electrodes through wires.

4. The dust suppression system according to claim 3, characterized in that: The water inlet pipe is provided with a water inlet valve, the water outlet pipe is provided with a water outlet valve, and the connecting pipeline is provided with a third valve.

5. A dust suppression method using the dust suppression system according to claim 3, characterized in that Follow these steps in order: The dust suppression liquid that integrates active capture, moistening and condensation is referred to as dust suppression liquid; The first step is to add water, fill the water tank; The second step is to add reagents, add alum, sulfite and potassium permanganate into the water tank, stir evenly, make the mass concentration of alum be 0.02%-0.2%, the mass concentration of sulfite be 0.01%-1%, and the mass concentration of potassium permanganate be 0.01%-1%, so as to form the dust reduction liquid; after alum is dissolved in water, aluminum hydroxide colloid with strong adsorption and positive charge is formed; The third step is to start the electrostatic generator, and each electrode on the sieve plate connected to the positive electrode of the electrostatic generator absorbs negative ions in the dust-removing liquid, so that the dust-removing liquid has a trace positive charge and increases the positive charge of the aluminum hydroxide colloid; The fourth step is to start the water supply pump and the booster pump. After the dust suppression liquid is pressurized by the water supply pump and the booster pump at two stages, it is sprayed toward the dust generating points through each nozzle at a pressure of 1-2MPa.

6. The dust reduction method according to claim 5, characterized in that: The dust generating points include the frame moving place, coal cutting place and coal discharge port of the fully mechanized mining face.

7. The dust reduction method according to claim 5, characterized in that: The electrode includes an insulating base and a metal conductive part connected to the insulating base, the upper end of the metal conductive part extends upward from the insulating base, the lower end of the metal conductive part extends downward from the insulating base, and the ends of the metal conductive part extending from the insulating base are both arrow-shaped with the tips facing away from the insulating base.

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