Blast dust settling control system

Abstract

The blasting smoke dust settlement control system belongs to the technical field of smoke dust settlement control, and particularly relates to a blasting smoke dust settlement control system. The blasting smoke dust settlement control system with fast dust deposition speed is provided. The blasting smoke dust settlement control system comprises a water gun, and is characterized in that positive and negative charges are loaded on the water mist emitted by the water gun to form positive and negative charge water mist.

Description

Technical Field

[0001] This invention belongs to the field of dust and smoke settling technology, and particularly relates to a dust and smoke settling control system for blasting. Background Technology

[0002] Currently, the main component of ammonium nitrate explosives and rock emulsion explosives used in underground iron ore development and preparation projects is ammonium nitrate. After blasting, these explosives produce toxic gases such as nitrogen oxides and sulfur (phosphorus) hydrides, forming blast dust. Long-term inhalation of these toxic gases and dust can cause lung damage and neurasthenia. Some toxic gases can also cause chronic pharyngitis, bronchitis, neurasthenia, and dental erosion, and may induce lung cell carcinoma. Carbon particles entering the lungs can also induce pneumoconiosis. Furthermore, the high concentration, wide particle size distribution, and large diffusion range of blast dust, especially during the collapse of the blasted iron ore body, cause the dust to diffuse even faster due to air compression, thus increasing the difficulty of dust suppression during blasting.

[0003] The treatment of blasting dust in mining areas has become a major concern both domestically and internationally. The main technologies employed in this area include spray dust suppression, fan extraction, and dust collection and filtration. Existing spray dust suppression technologies use water cannons to spray water mist or chemical dust suppressants to inhibit the diffusion and settling of dust. However, these technologies only spray water mist into the air to reduce dust concentration, but the dust adsorption effect is not ideal, and the settling speed is slow, leading to secondary pollution with long-term use. Summary of the Invention

[0004] This invention addresses the aforementioned problems by providing a rapid dust deposition control system for blasting fumes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: the present invention includes a water cannon, characterized in that positive and negative charges are loaded onto the water mist emitted by the water cannon to form positive and negative charged water mist.

[0006] As a preferred embodiment, the charging control signal for loading positive and negative charges in this invention adopts a discontinuous sine wave.

[0007] As another preferred embodiment, the maximum voltage for charge control regulation in this invention is 40kV, and the control method for the duration of water mist with different charges is as follows: U = ±40sin(2πt), t = 1min ~ 4min; U = 0, t = 4min ~ 5min; period T = 5min.

[0008] As another preferred embodiment, the water mist emitted by the water cannon of the present invention is an acidic water mist or an alkaline water mist.

[0009] As another preferred embodiment, the water mist loading of positive and negative charges in this invention is achieved by droplet impact on a charged sphere.

[0010] As another preferred embodiment, the water cannon of the present invention includes a fog cannon vehicle body 1, on which a water tank 2, an acid tank 9, an alkali tank 10, a water pump 4, and a transverse cylinder 12 are provided. A fan 5 is provided at the rear of the transverse cylinder 12. The outlet of the water pump 4 is connected to the inlet of the nozzle 8 through a flexible conduit 6. The nozzle 8 is located at the front of the transverse cylinder 12. A component 7 for loading positive and negative charges onto the water mist is provided on the transverse cylinder 12 corresponding to the outlet of the nozzle 8. The inlet of the water pump 4 is connected to the water tank 2, the acid tank 9, and the alkali tank 10 through a transmission pipe.

[0011] As a preferred embodiment, the lower end of the fog cannon vehicle body 1 of the present invention is provided with rollers.

[0012] As another preferred embodiment, the acid tank 9 and alkali tank 10 of the present invention are equipped with a stirrer 3.

[0013] As another preferred embodiment, the inlet of the water pump 4 of the present invention is connected to the outlet of the connector 11, the first inlet of the connector 11 is connected to the water tank 2 through the first transmission pipe, the second inlet of the connector 11 is connected to the acid tank 9 through the second transmission pipe, and the third inlet of the connector 11 is connected to the alkali tank 10 through the third transmission pipe.

[0014] As another preferred embodiment, the water tank 2, acid tank 9 and alkali tank 10 of the present invention are all provided with liquid inlet and liquid outlet.

[0015] As another preferred embodiment, the water tank 2, acid tank 9, and alkali tank 10 of the present invention are arranged laterally at the lower part of the fog cannon vehicle body 1, the water pump 4 is located at the rear end of the fog cannon vehicle body 1, and the transverse cylinder 12 is located at the front part of the fog cannon vehicle body 1.

[0016] Secondly, the present invention provides a first solenoid valve, a second solenoid valve, and a third solenoid valve at the first inlet, the second inlet, and the third inlet, respectively.

[0017] In addition, the component 7 for loading positive and negative charges onto the water mist according to the present invention uses positive and negative electrodes disposed on the side of the outlet of the nozzle 8.

[0018] The beneficial effects of this invention.

[0019] This invention loads positive and negative charges onto the water mist emitted by the water cannon to form positive and negative charged water mist. The charged water mist repels each other, and the droplets are not easy to aggregate. Therefore, the mist diffuses faster, the particles are smaller, and it is easier to diffuse and expand, adsorb more dust, and accelerate dust deposition. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0021] Figure 1This is a schematic diagram of the water mist particle charging control system, electrical signals (positive charge period T1, negative charge period T2, near-zero charge T3), and charge space of the present invention.

[0022] Figure 2 This is a comparison chart of the water mist charge signal and the water mist condensation rate of this invention. Figure 2 In the middle, 'a' represents the water mist charge signal over 15 minutes. Figure 2 b represents the water mist condensation rate after 15 minutes. Figure 2 The solid curve in section b represents the amount of water mist deposition regulated by charge. Figure 2 The dashed curve in b represents the amount of water mist that settles without being charged.

[0023] Figure 3 This is a schematic diagram of the water cannon structure of the present invention.

[0024] In the diagram, 1 is the main body of the fog cannon vehicle, 2 is the water tank, 3 is the agitator, 4 is the water pump, 5 is the fan, 6 is the flexible duct, 7 is the component that loads positive and negative charges onto the water mist, 8 is the nozzle, 9 is the acid tank, 10 is the alkali tank, 11 is the connector, and 12 is the horizontal cylinder. Detailed Implementation

[0025] As shown in the figure, the present invention includes a water cannon, which loads positive and negative charges onto the water mist emitted by the water cannon to form positive and negative charged water mist.

[0026] The charging control signal for loading positive and negative charges adopts a discontinuous sine wave, such as... Figure 2 As shown in Figure a, a discontinuous sine wave is used to form both positively and negatively charged water mist, as well as near-zero charged water mist. The combined use of positively and negatively charged water mist and near-zero charged water mist yields better results.

[0027] Water mists with different charges meet and settle quickly; alternating spraying of positive and negative charge water mists improves settling efficiency; near-zero charge water mists, due to the lack of repulsion effect from like charges, cause particles to easily aggregate and form larger droplets, which promotes subsequent water mist settling.

[0028] The maximum voltage for charge control is 40kV. The control methods for the duration of water mist with different charges are: U = ±40sin(2πt), t = 1min~4min; U = 0, t = 4min~5min; period T = 5min. Figure 2 As shown in Figure a.

[0029] The following is a comparative verification process of the working effect of this invention:

[0030] Method 1: The water cannon sprays dust in the smoke chamber without applying an electrical signal. After spraying, the water mist settling velocity is measured by the weight of the condensate.

[0031] Method 2: Start the charge control to adjust the maximum voltage to 40kV, and adjust the duration of water mist for different charges as follows. Figure 2 As shown in Figure a, repeat the above experiment.

[0032] like Figure 2 As shown in Figure b, within 5 minutes after the spraying ended, the water mist deposition rate increased by 80% in the experiment with charge control. After 15 minutes of spraying, the dust particle concentration decreased by 95% in the experiment with charge control. The above experiments show that charged water mist has a better dust adsorption effect due to its finer particles. Alternating spraying of water mist with different charges is beneficial for condensation into large water droplets and sedimentation.

[0033] The water mist emitted by the water cannon is either acidic or alkaline.

[0034] The positive and negative charges are loaded by water mist through droplet impact on a charged sphere.

[0035] The water cannon includes a fog cannon vehicle body 1, on which a water tank 2, an acid tank 9, an alkali tank 10, a water pump 4, and a transverse cylinder 12 are installed. A fan 5 is installed at the rear of the transverse cylinder 12. The outlet of the water pump 4 is connected to the inlet of the nozzle 8 through a flexible conduit 6. The nozzle 8 is located at the front of the transverse cylinder 12. A component 7 for loading positive and negative charges onto the water mist is installed on the transverse cylinder 12 corresponding to the outlet of the nozzle 8. The inlet of the water pump 4 is connected to the water tank 2, the acid tank 9, and the alkali tank 10 through a transmission pipe.

[0036] The water tank 2, acid tank 9, and alkali tank 10 are arranged laterally at the lower part of the fog cannon vehicle body 1, the water pump 4 is located at the rear end of the fog cannon vehicle body 1, and the transverse cylinder 12 is located at the front of the fog cannon vehicle body 1.

[0037] Setting up fan 5 facilitates the rapid diffusion of water mist.

[0038] The water pump 4 transfers the liquid from the water tank 2, acid tank 9, and alkali tank 10 to the nozzle 8, and then sprays it out from the nozzle 8.

[0039] The lower end of the fog cannon vehicle body 1 is equipped with rollers to facilitate the movement of the fog cannon vehicle body 1.

[0040] Agitators 3 are installed in the acid tank 9 and alkali tank 10.

[0041] The inlet of the water pump 4 is connected to the outlet of the connector 11. The first inlet of the connector 11 is connected to the water tank 2 through the first transmission pipe. The second inlet of the connector 11 is connected to the acid tank 9 through the second transmission pipe. The third inlet of the connector 11 is connected to the alkali tank 10 through the third transmission pipe.

[0042] A first solenoid valve, a second solenoid valve, and a third solenoid valve are respectively installed at the first inlet, the second inlet, and the third inlet. By controlling the solenoid valves, the type of liquid supplied to the nozzle 8 is controlled.

[0043] For acidic blasting fumes, the third solenoid valve is activated, and the water cannon sprays an alkaline liquid to adsorb the acidic blasting fumes. For alkaline blasting fumes, the second solenoid valve is activated, and the water cannon sprays an acidic liquid to adsorb the alkaline blasting fumes. After acid-base neutralization, the harmful gases are converted into harmless salts.

[0044] The component 7 that loads positive and negative charges onto the water mist uses positive and negative electrodes located beside the outlet of the nozzle 8. When the sprayed droplets pass through the electrodes, they acquire a charge opposite to that of the electrodes, thus charging the droplets. The amount of charge on the water mist is adjusted by controlling the electrodes.

[0045] The water tank 2, acid tank 9 and alkali tank 10 are all equipped with liquid inlets and liquid outlets.

[0046] This invention can be used as a rapid settling water cannon for the treatment of underground blasting gas sources.

[0047] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of the present invention.

Claims

1. A blasting dust settling control system, including a water cannon, characterized in that... Adding positive and negative charges to the water mist emitted by the water cannon creates positively and negatively charged water mist. The water mist with positive and negative charges is sprayed alternately, forming both positive and negative charge water mist as well as near-zero charge water mist. The positive and negative charge water mist and the near-zero charge water mist are used in combination. The charging control signal for applying positive and negative charges uses a discontinuous sine wave; The maximum voltage for charge control is 40 kV. The control methods for the duration of water mist with different charges are: U = ±40sin(2πt), t = 1 min ~ 4 min; U = 0, t = 4 min ~ 5 min; period T = 5 min.

2. The blasting dust settling control system according to claim 1, characterized in that... The water mist emitted by the water cannon is either acidic or alkaline.

3. The blasting dust settling control system according to claim 1, characterized in that... The positive and negative charges are loaded by water mist through droplet impact on a charged sphere.

4. The blasting dust settling control system according to claim 2, characterized in that... The alkaline water mist emitted by the water cannon adsorbs acidic blasting fumes; the acidic water mist emitted by the water cannon adsorbs alkaline blasting fumes.

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