Double-adsorption type solid-liquid two-phase flow dust removal device

Abstract

The invention discloses a double-adsorption type solid-liquid two-phase flow dust removal device, belongs to the technical field of wet spraying dust removal, and aims to solve the problems of high water consumption, low dust removal efficiency and poor dust removal effect of coal in the prior art. The device comprises a magnetite powder suspension atomization unit, a water spraying nozzle, a dust removal microporous membrane, an electromagnet pore plate and an axial flow fan which are sequentially arranged in the flowing direction of dust airflow. The water spraying direction of the water spraying nozzle faces the dust removal microporous membrane, and spraying water sprayed by the water spraying nozzle forms a water membrane on the dust removal microporous membrane; in the dust removal process, the electromagnet pore plate is electrified, so that magnetite powder is adsorbed on the surface, back to the electromagnet pore plate, of the dust removal microporous membrane; after dust removal is completed, the electromagnet pore plate is powered off, so that the magnetite powder is separated from the surface, back to the electromagnet pore plate, of the dust removal microporous membrane. The device can be used for coal dust removal.

Description

Technical Field

[0001] The invention belongs to the technical field of wet spray dust removal, and in particular relates to a double-adsorption solid-liquid two-phase flow dust removal device. Background Art

[0002] Coal dust removal equipment is usually a water film dust collector, which uses a sprayer to disperse water into small droplets in the air. The small droplets collide with the dust to capture the dust and form a water film on the inner wall of the dust collector to prevent the dust from rebounding and washing on the wall to cause secondary dust.

[0003] The water film dust collector has a simple structure and low cost, but it has problems such as high water consumption, low dust removal efficiency, and poor dust removal effect. Summary of the invention

[0004] In view of the above analysis, the present invention aims to provide a double-adsorption solid-liquid two-phase flow dust removal device to solve the problems of large water consumption, low dust removal efficiency and poor dust removal effect of coal in the prior art.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions.

[0006] The present invention provides a double-adsorption solid-liquid two-phase flow dust removal device, comprising a magnetite powder suspension atomization unit, a spray water nozzle, a dust removal microporous membrane, an electromagnetic orifice plate and an axial flow fan which are arranged in sequence along the flow direction of the dust airflow; the spray water nozzle sprays water in a direction toward the dust removal microporous membrane, and the spray water sprayed by the spray water nozzle forms a water film on the dust removal microporous membrane; during the dust removal process, the electromagnetic orifice plate is energized so that the magnetite powder is adsorbed on the surface of the dust removal microporous membrane facing away from the electromagnetic orifice plate; after the dust removal is completed, the electromagnetic orifice plate is de-energized so that the magnetite powder is separated from the surface of the dust removal microporous membrane facing away from the electromagnetic orifice plate.

[0007] Furthermore, the above-mentioned double-adsorption solid-liquid two-phase flow dust removal device also includes a box; the atomization droplet outlet of the magnetite powder suspension atomization unit, the spray water nozzle, the dust removal microporous membrane, the electromagnet orifice plate and the axial flow fan are all located in the box.

[0008] Furthermore, a dust air inlet is provided at one end of the box body, and an air outlet for the air after dust removal is provided at the other end of the box body.

[0009] Furthermore, the shape of the box body is cylindrical or rectangular; the shapes of the dust removal microporous membrane and the electromagnet orifice plate are circular or rectangular.

[0010] Furthermore, the magnetite powder suspension atomization unit includes a magnetite powder suspension preparation device, an air compressor, an atomizer and an atomizing nozzle. The liquid outlet of the magnetite powder suspension preparation device is connected to the inlet end of the atomizer through a liquid supply pipe, the air outlet of the air compressor is connected to the inlet end of the atomizer through an air supply pipe, and the outlet end of the atomizer is connected to the atomizing nozzle.

[0011] Furthermore, the outlet end of the atomizer is located at the center of the box body and the mist outlet direction is the same as the flow direction of the dust airflow.

[0012] Furthermore, the magnetite powder suspension atomization unit also includes a liquid supply regulating valve arranged on the liquid supply pipe and an air supply regulating valve arranged on the air supply pipe.

[0013] Furthermore, the above-mentioned double-adsorption solid-liquid two-phase flow dust removal device also includes an inlet dust concentration monitor arranged at the dust airflow inlet and an outlet dust concentration monitor arranged at the airflow outlet after dust removal.

[0014] Furthermore, the above-mentioned double-adsorption solid-liquid two-phase flow dust removal device also includes a guide groove arranged below the atomized droplet outlet and the spray water nozzle and a sewage collection groove arranged below the dust removal microporous membrane, and the guide groove is connected to the sewage collection groove.

[0015] Furthermore, the above-mentioned double-adsorption solid-liquid two-phase flow dust removal device also includes a mineral powder collection tank arranged below the dust removal microporous membrane.

[0016] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0017] A) The double-adsorption solid-liquid two-phase flow dust removal device provided by the present invention adopts a solid-liquid two-phase flow dust removal method and has the advantages of simple structure, high automation, high recycling rate, good dust removal effect, etc.

[0018] B) The double-adsorption solid-liquid two-phase flow dust removal device provided by the present invention adopts a magnetite powder suspension as a spray source. The magnetite powder can secondary break the droplets sprayed from the magnetite powder suspension atomizing nozzle to achieve secondary atomization, reduce the particle size of the droplets, effectively improve the atomization effect, and reduce water consumption; at the same time, based on the fact that dust is usually negatively charged, the magnetite powder itself has magnetism, and in the process of contact with dust, it can adsorb dust, further enhancing the dust removal effect.

[0019] C) The double-adsorption solid-liquid two-phase flow dust removal device provided by the present invention has an electromagnetic orifice plate arranged behind the dust removal microporous membrane. The dust removal microporous membrane can filter out droplets carrying dust and form a liquid film to avoid secondary dust. The electromagnetic orifice plate can adsorb magnetite powder in an electromagnetic way. The magnetite powder can be recovered and reused by timed power-off and demagnetization of the electromagnetic orifice plate.

[0020] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0022] Figure 1 A schematic structural diagram of a double-adsorption solid-liquid two-phase flow dust removal device provided in Example 1 of the present invention;

[0023] Figure 2 A schematic diagram of the structure of a dust removal microporous membrane in a double-adsorption solid-liquid two-phase flow dust removal device provided in Example 1 of the present invention;

[0024] Figure 3 A schematic diagram of the structure of an electromagnet orifice plate in a double-adsorption solid-liquid two-phase flow dust removal device provided in Example 1 of the present invention;

[0025] Figure 4 A schematic diagram of the process of pollutant discharge and powder removal in a double-adsorption solid-liquid two-phase flow dust removal device provided in Example 1 of the present invention.

[0026] Reference numerals:

[0027] 1-magnetite powder suspension preparation device; 2-air compressor; 3-atomizer; 4-atomizing nozzle; 5-water spray nozzle; 6-dust removal microporous membrane; 7-electromagnetic iron orifice plate; 8-crank connecting rod mechanism; 9-connecting rod; 10-guide rail; 11-box; 12-liquid supply pipe; 13-air supply pipe; 14-liquid supply regulating valve; 15-air supply regulating valve; 16-intake dust concentration monitor; 17-outlet dust concentration monitor; 18-guide trough; 19-wastewater collection trough; 20-connecting shaft; 21-air outlet after dust removal; 22-axial flow fan; 23-dust air inlet; 24-mineral powder collection trough. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0029] Embodiment 1

[0030] This embodiment provides a double adsorption solid-liquid two-phase flow dust removal device, see Figure 1, including a box 11 and a magnetite powder suspension atomization unit, a spray water nozzle 5, and a dust removal microporous membrane 6 (for example, a plastic microporous membrane, see Figure 2 ), electromagnet orifice plate 7 (see Figure 3 ) and axial flow fan 22.

[0031] Among them, the box body 11 is erected on the installation surface (for example, the ground) through a box body bracket; the atomization droplet outlet of the magnetite powder suspension atomization unit, the spray water nozzle 5, the dust removal microporous membrane 6, the electromagnet orifice plate 7 and the axial flow fan 22 are all located in the box body 11, and the axial flow fan 22 is erected in the box body 11 through a fan bracket.

[0032] The water spraying direction of the spray water nozzle 5 is toward the dust removal microporous membrane 6, and the spray water sprayed by the spray water nozzle 5 forms a water film on the dust removal microporous membrane 6; during the dust removal process, the electromagnet orifice plate 7 is energized, so that the magnetite powder is adsorbed on the surface of the dust removal microporous membrane 6 facing away from the electromagnet orifice plate 7. After the dust removal is completed, the electromagnet orifice plate 7 is de-energized, so that the magnetite powder is separated from the surface of the dust removal microporous membrane 6 facing away from the electromagnet orifice plate 7.

[0033] It can be understood that a dust air flow inlet 23 is opened at one end of the box body 11, and a post-dust removal air flow outlet 21 is opened at the other end. According to the flow direction of the dust air flow, the dust air flow inlet 23 is located in front of the magnetite powder suspension atomization unit, and the post-dust removal air flow outlet 21 is located behind the axial flow fan 22.

[0034] During implementation, the specific dust removal method process is as follows:

[0035] Step 1: Turn on the axial flow fan 22 to generate negative pressure in the box 11. The dust airflow flows through the dust airflow inlet 23 and is sucked into the box 11. The magnetite powder suspension atomization unit sprays atomized droplets of the magnetite powder suspension into the box 11. While spraying, the magnetite powder in the atomized droplets performs secondary crushing on the atomized droplets to obtain atomized droplets with smaller particle sizes. The atomized droplets collide with the dust airflow. During the collision, the dust in the dust airflow is captured by the atomized droplets to form solid-liquid two-phase droplets. The dust airflow is subjected to a dust removal operation. Some of the solid-liquid two-phase droplets gather and fall down, and the remaining solid-liquid two-phase droplets continue to flow.

[0036] Step 2: After the primary dust removal, the airflow and the entrained atomized droplets flow to the dust removal microporous membrane 6, and the entrained atomized droplets and the spray water sprayed from the spray water nozzle 5 form a water film on the micropores of the dust removal microporous membrane 6. The water film performs secondary dust removal on the dust airflow, and the atomized droplets gather on the dust removal microporous membrane 6 to form a water flow and flow down in strands with the water film;

[0037] Step 3: During the dust removal process, the electromagnet orifice plate 7 is energized, and the magnetite powder separated from the atomized droplets uses its own adsorption characteristics to perform a third dust removal on the dust in the airflow after the secondary dust removal, and condenses into solid particles. The solid particles are adsorbed on the surface of the dust removal microporous membrane 6 facing away from the electromagnet orifice plate 7 under the action of the electromagnet orifice plate 7. The dust in the solid particles is washed away from the magnetite powder during the flow of water and water film, and flows down with the water flow and water film;

[0038] Step 4: The dust-removed airflow passes through the micropores of the dust-removing microporous membrane 6 and the plate holes of the electromagnet orifice plate 7, and finally flows out from the dust-removed airflow outlet 21, completing the dust removal of the dust airflow;

[0039] Step 5: After dust removal, the electromagnet orifice plate 7 is powered off, so that the magnetite powder is separated from the dust removal microporous membrane 6 and faces away from the surface of the electromagnet orifice plate 7, thereby completing the recovery of the magnetite powder.

[0040] Compared with the prior art, the double-adsorption solid-liquid two-phase flow dust removal device provided in this embodiment adopts a solid-liquid two-phase flow dust removal method, rather than the existing dust removal device which adopts a gas-liquid two-phase flow. It has the advantages of simple structure, high automation, high recycling rate, and good dust removal effect.

[0041] Specifically, on the one hand, by using magnetite powder suspension as the spray source, the magnetite powder can secondary break the droplets sprayed from the magnetite powder suspension atomizing nozzle 4, realize secondary atomization, reduce the particle size of the droplets, effectively improve the atomization effect, and reduce water consumption; at the same time, based on the fact that dust is usually negatively charged, the magnetite powder itself is magnetic, and in the process of contact with dust, it can adsorb dust, further enhancing the dust removal effect.

[0042] On the other hand, an electromagnet orifice plate 7 is arranged behind the dust removal microporous membrane 6. The dust removal microporous membrane 6 can filter out the droplets carrying dust and form a liquid film to avoid secondary dust. The electromagnet orifice plate 7 can adsorb magnetite powder by electromagnetic means. The magnetite powder can be recovered and reused by timing power off and demagnetization of the electromagnet orifice plate 7.

[0043] From the perspective of dust fluid flow, the radial cross-section of the box body 11 is circular, that is, the box body 11 is cylindrical or rectangular.

[0044] Correspondingly, the dust removal microporous membrane 6 and the electromagnet orifice plate 7 are also circular or rectangular in shape, and both are located in the middle part of the box body 11. The dust removal microporous membrane 6 and the electromagnet orifice plate 7 are detachably fixedly connected by bolts.

[0045] As for the structure of the magnetite powder suspension atomization unit, specifically, it includes a magnetite powder suspension preparation device 1, an air compressor 2, an atomizer 3 and an atomizing nozzle 4, the atomizer 3 is fixedly connected to the box body 11 through an atomizer bracket, the liquid outlet of the magnetite powder suspension preparation device 1 is connected to the inlet end of the atomizer 3 through a liquid supply pipe 12, the air outlet of the air compressor 2 is connected to the inlet end of the atomizer 3 through an air supply pipe 13, the inlet end of the atomizer 3 is connected to the outlet end of the atomizer 3 through a metal pipe, the outlet end of the atomizer 3 is threadedly connected to the atomizing nozzle 4, the inlet end of the atomizer 3 is located outside the box body 11, the outlet end of the atomizer 3 is located at the center position in the box body 11, and the mist outlet direction is the same as the flow direction of the dust airflow.

[0046] It can be understood that in order to be able to adjust the mist output of the magnetite powder suspension preparation device 1 and the particle size of the atomized droplets, the above-mentioned magnetite powder suspension atomization unit also includes a liquid supply regulating valve 14 arranged on the liquid supply pipe 12 and an air supply regulating valve 15 arranged on the air supply pipe 13. The mist output of the magnetite powder suspension preparation device 1 and the particle size of the atomized droplets are adjusted by the liquid supply regulating valve 14 and the air supply regulating valve 15.

[0047] In order to monitor the dust removal effect in real time, the above-mentioned dual-adsorption solid-liquid two-phase flow dust removal device also includes an inlet dust concentration monitor 16 arranged at the dust airflow inlet 23 and an outlet dust concentration monitor 17 arranged at the airflow outlet 21 after dust removal. In this way, the inlet dust concentration at the dust airflow inlet 23 is monitored in real time by the inlet dust concentration monitor 16, and the outlet dust concentration at the airflow outlet 21 after dust removal is monitored in real time by the outlet dust concentration monitor 17. If the inlet dust concentration and / or the outlet dust concentration exceeds the threshold, the flow rate of the dust airflow is reduced, the flow rate of the atomized droplets of the magnetite powder suspension is increased, and / or the flow rate of the spray water is increased, so as to improve the dust removal capacity of the dual-adsorption solid-liquid two-phase flow dust removal device and effectively ensure the dust removal effect of the dual-adsorption solid-liquid two-phase flow dust removal device.

[0048] In order to realize the collection of dust and sewage, the above-mentioned double-adsorption solid-liquid two-phase flow dust removal device also includes a guide groove 18 arranged below the atomized droplet outlet and the spray water nozzle 5 and a sewage collection groove 19 arranged below the dust removal microporous membrane 6. The guide groove 18 is connected to the sewage collection groove 19, and the guide groove 18 and the sewage collection groove 19 are located outside the box body 11. In this way, during the flow of the dust airflow and the atomized droplets of the magnetite powder suspension, the dust airflow and the atomized droplets of the magnetite powder suspension can fall into the guide groove 18 after condensation, and further flow into the sewage collection groove 19. The atomized droplets gather into water flow and water film on the dust removal microporous membrane 6 and can flow into the sewage collection groove 19, thereby realizing the collection of dust and sewage.

[0049] Similarly, in order to realize the collection and recovery of magnetite powder, the above-mentioned double-adsorption solid-liquid two-phase flow dust removal device also includes a mineral powder collection tank 24 arranged below the dust removal microporous membrane 6. The mineral powder collection tank 24 is located outside the box body 11. The magnetite powder detached from the surface of the dust removal microporous membrane 6 facing away from the electromagnet orifice plate 7 can fall into the mineral powder collection tank 24, thereby realizing the collection and recovery of magnetite powder.

[0050] In practical applications, it is necessary to separate dust, sewage and magnetite powder. The above-mentioned double-adsorption solid-liquid two-phase flow dust removal device also includes a slide rail assembly. The dust removal microporous membrane 6 is slidably connected through the slide rail assembly box 11. Along the flow direction of the dust airflow, the guide groove 18, the sewage collection groove 19 and the mineral powder collection groove 24 are arranged in sequence; the dust removal microporous membrane 6 has a sewage discharge state and a powder removal state. When the dust removal microporous membrane 6 is in the sewage discharge state, the dust removal microporous membrane 6 slides along the slide rail to the top of the sewage collection groove 19. When the dust removal microporous membrane 6 is in the powder removal state, the dust removal microporous membrane 6 slides along the slide rail to the top of the mineral powder collection groove 24.

[0051] It can be understood that in order to drive the reciprocating motion of the dust removal microporous membrane 6, so as to switch between the sewage discharge state and the powder removal state, the structure of the slide rail assembly is specifically described in detail. Figure 4 , including a guide rail 10, a crank-connecting rod mechanism 8 and a connecting rod 9. The dust-removing microporous membrane 6 is slidably connected to the box body 11 through the guide rail 10, and the dust-removing microporous membrane 6 is connected to the crank-connecting rod mechanism 8 through the connecting rod 9. The crank-connecting rod mechanism 8 can drive the dust-removing microporous membrane 6 to perform reciprocating motion.

[0052] Since magnetite powder contains water, it is easy to adhere to the dust removal microporous membrane 6 and cannot be separated. In addition, dust in sewage is also easy to deposit on the dust removal microporous membrane 6. In order to promote the separation of dust and magnetite powder, the above-mentioned dust removal microporous membrane 6 is provided with a connecting shaft 20. The connecting shaft 20 has a through hole opened in the axial direction. The cross-sectional shape of the through hole is a long strip. One end of the connecting rod 9 is inserted into the through hole and the connecting rod 9 and the hole wall of the through hole have a gap in the vertical direction. The guide rail 10 is arranged in the box body 11 and can be rotated in the horizontal direction. The cross-sectional shape of the guide rail 10 parallel to the movement direction of the dust removal microporous membrane 6 is a triangle.

[0053] Based on the structure of the above slide rail assembly, the process of sewage discharge and powder removal is as follows:

[0054] The dust removal microporous membrane 6 is in a sewage discharge state and is located at the lowest point of the guide rail 10 (i.e., the end close to the dust airflow inlet 23, the height of the lowest point is 0), and the dust removal microporous membrane 6 gradually moves upward along the guide rail 10. At the same time, the end of the connecting shaft 20 moves upward in the through hole, and the gap between the through hole and the connecting shaft 20 adapts to the displacement of the dust removal microporous membrane 6 in the vertical direction;

[0055] When the dust-removing microporous membrane 6 reaches the highest point of the guide rail 10 and continues to move, it will suddenly detach from the guide rail 10, fall in the vertical direction and vibrate. At this time, the dust-removing microporous membrane 6 is in a powder-removing state, and the vibration causes the magnetite powder to immediately detach from the dust-removing microporous membrane 6. At the same time, the guide rail 10 rotates 180°.

[0056] The dust removal microporous membrane 6 is located at the lowest point of the guide rail 10 (i.e., the end away from the dust airflow inlet 23, the height of the lowest point is 0), and the dust removal microporous membrane 6 gradually moves upward along the guide rail 10. At the same time, the end of the connecting shaft 20 moves upward in the through hole, and the gap between the through hole and the connecting shaft 20 adapts to the displacement of the dust removal microporous membrane 6 in the vertical direction;

[0057] When the dust-removing microporous membrane 6 reaches the highest point of the guide rail 10 and continues to move, it will suddenly detach from the guide rail 10, fall in the vertical direction and vibrate. At this time, the dust-removing microporous membrane 6 is in a sewage discharge state, and the vibration causes the dust to immediately detach from the dust-removing microporous membrane 6. At the same time, the guide rail 10 rotates 180°.

[0058] Repeating the above movement process can achieve complete separation of dust and magnetite powder, see Figure 4 .

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A double adsorption solid-liquid two-phase flow dust removal device, characterized in that: It includes a magnetite powder suspension atomization unit, a spray water nozzle, a dust removal microporous membrane, an electromagnet orifice plate and an axial flow fan which are sequentially arranged along the dust airflow direction; The water spraying direction of the spray water nozzle is toward the dust removal microporous membrane, and the spray water sprayed by the spray water nozzle forms a water film on the dust removal microporous membrane; During the dust removal process, the electromagnetic orifice plate is energized, so that the magnetite powder is adsorbed on the surface of the dust removal microporous membrane facing away from the electromagnetic orifice plate; After the dust removal is completed, the electromagnetic orifice plate is powered off, so that the magnetite powder is separated from the dust removal microporous membrane and faces the surface of the electromagnetic orifice plate away from the dust removal microporous membrane.

2. The double adsorption solid-liquid two-phase flow dust removal device according to claim 1 is characterized in that: Also includes a box; The atomized liquid droplet outlet, the spray water nozzle, the dust removal microporous membrane, the electromagnet orifice plate and the axial flow fan of the magnetite powder suspension atomization unit are all located in the box body.

3. The double adsorption solid-liquid two-phase flow dust removal device according to claim 2 is characterized in that: A dust air inlet is provided at one end of the box body, and a dust-removed air outlet is provided at the other end of the box body.

4. The double adsorption solid-liquid two-phase flow dust removal device according to claim 2 is characterized in that: The box body is in the shape of a cylinder or a rectangular column; The dust removal microporous membrane and the electromagnet orifice plate are in a circular or rectangular shape.

5. The double adsorption solid-liquid two-phase flow dust removal device according to claim 1, characterized in that: The magnetite powder suspension atomization unit comprises a magnetite powder suspension preparation device, an air compressor, an atomizer and an atomizing nozzle. The liquid outlet of the magnetite powder suspension preparation device is connected to the inlet end of the atomizer through a liquid supply pipe, the air outlet of the air compressor is connected to the inlet end of the atomizer through an air supply pipe, and the outlet end of the atomizer is connected to the atomizing nozzle.

6. The double-adsorption solid-liquid two-phase flow dust removal device according to claim 5 is characterized in that: The outlet end of the atomizer is located at the center of the box body and the mist outlet direction is the same as the dust airflow direction.

7. The double adsorption solid-liquid two-phase flow dust removal device according to claim 5, characterized in that: The magnetite powder suspension atomization unit further comprises a liquid supply regulating valve arranged on the liquid supply pipe and an air supply regulating valve arranged on the air supply pipe.

8. The double adsorption solid-liquid two-phase flow dust removal device according to claim 1, characterized in that: It also includes an inlet dust concentration monitor arranged at the dust air inlet and an outlet dust concentration monitor arranged at the air outlet of the air flow after dust removal.

9. The double adsorption solid-liquid two-phase flow dust removal device according to claim 1, characterized in that: It also includes a guide groove arranged below the atomized droplet outlet and the spray water nozzle, and a sewage collection groove arranged below the dust removal microporous membrane, and the guide groove is connected to the sewage collection groove.

10. The double adsorption solid-liquid two-phase flow dust removal device according to claim 1, characterized in that: The utility model also comprises a mineral powder collecting tank arranged below the dust removal microporous membrane.

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