Preparation device of magnetite powder suspension and dust removal system

Abstract

The invention discloses a preparation device of magnetite powder suspension liquid and a dust removal system, belongs to the technical field of coal dust removal, and aims to solve the problems that the preparation device of the magnetite powder suspension liquid in the prior art is complicated in structure, and the magnetite powder suspension liquid settles in the conveying and filtering processes. The preparation device comprises a stirring barrel, a stirring impeller, a water inlet pipe, a mineral powder feeding opening and a liquid supply pipe, the stirring impeller is arranged in the stirring barrel and located at the bottom of the stirring barrel, the water inlet pipe is communicated with the interior of the lower portion of the stirring barrel, the water inlet direction of the water inlet pipe is in the tangential direction of the stirring barrel, the mineral powder feeding opening is formed in the top of the stirring barrel, and the liquid supply pipe penetrates through the top of the stirring barrel and extends below the liquid level of the stirring barrel. The device can be used for coal dust removal.

Description

Technical Field

[0001] The invention belongs to the technical field of coal dust removal, and in particular relates to a preparation device for a magnetite powder suspension and a dust removal system. Background Art

[0002] In the prior art, a device for preparing a magnetite powder suspension generally includes an agitator, a slurry pump and a filter, wherein the agitator generates a suspension by stirring, which is then transported to a filter screen by a slurry pump, and the magnetite powder particles and impurities in the suspension are separated on the screen by vibration.

[0003] The structure of the device for preparing the magnetite powder suspension is relatively complex, and the magnetite powder suspension may settle during the transportation and filtration process, which affects the preparation of the magnetite powder suspension. Summary of the invention

[0004] In view of the above analysis, the present invention aims to provide a device for preparing a magnetite powder suspension and a dust removal system to solve the problems in the prior art that the device for preparing a magnetite powder suspension has a complex structure and the magnetite powder suspension undergoes sedimentation during transportation and filtration.

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

[0006] The invention provides a device for preparing a magnetite powder suspension, comprising a stirring barrel, a stirring impeller, a water inlet pipe, a mineral powder feeding port and a liquid supply pipe; the stirring impeller is arranged in the stirring barrel and is located at the bottom of the stirring barrel, the water inlet pipe is connected with the lower part of the stirring barrel, the water inlet direction of the water inlet pipe is along the tangential direction of the stirring barrel, the mineral powder feeding port is arranged at the top of the stirring barrel, and the liquid supply pipe passes through the top of the stirring barrel and extends to below the liquid surface of the stirring barrel.

[0007] Furthermore, the water inlet pipe is a straight pipe or an arc-shaped pipe.

[0008] Furthermore, the stirring impeller is rotatably connected to the bottom of the stirring barrel through a bearing.

[0009] Furthermore, the above-mentioned magnetite powder suspension preparation device also includes a filter mesh arranged at the liquid inlet end of the liquid supply pipe.

[0010] Furthermore, the pore size of the filter mesh is 200 to 300 meshes.

[0011] Furthermore, the ratio of the distance between the top of the stirring impeller and the liquid inlet end of the liquid supply pipe to the distance between the liquid inlet end of the liquid supply pipe and the liquid surface of the stirring barrel is 0.8 to 1.2.

[0012] Furthermore, the height of the mixing barrel is 1-1.2 m, the height of the mixing impeller is 0.1-0.2 m, the distance between the liquid inlet end of the liquid supply pipe and the bottom of the mixing barrel is 0.4-0.5 m, and the distance between the liquid surface of the mixing barrel and the bottom of the mixing barrel is 0.7-0.8 m.

[0013] Furthermore, the above-mentioned magnetite powder suspension preparation device also includes a liquid level monitor arranged in the stirring barrel.

[0014] Furthermore, the liquid level monitor is a static pressure liquid level monitor.

[0015] The present invention also provides a dust removal system, comprising a device for preparing the magnetite powder suspension.

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

[0017] The device for preparing the magnetite powder suspension provided by the present invention adopts the method of tangential water inlet from the bottom, powder inlet from the top, and liquid extraction from the middle, and the stirring and conveying are integrated in the same stirring drum, and the structure is simple. On the one hand, the water in the stirring drum is fully swirled by the tangential water inlet from the bottom and the rotation of the stirring impeller, which strengthens the turbulent effect of the water, promotes the mixing of water and magnetite powder, and facilitates the generation of magnetite powder suspension; on the other hand, since the water inlet from the bottom and the powder inlet from the top in the stirring drum, the magnetite powder suspension in the middle position of the stirring drum is relatively stable and uniform, and the liquid is directly extracted from the middle position of the stirring drum through the liquid supply pipe 12, and then connected to the subsequent dust removal device, and supplied to the dust removal device under the negative pressure suction of the subsequent dust removal device, and used for coal dust removal, which can effectively reduce the sedimentation of the magnetite powder suspension during the conveying and filtering process.

[0018] 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

[0019] 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.

[0020] Figure 1 A schematic structural diagram of a device for preparing a magnetite powder suspension provided in Example 1 of the present invention;

[0021] Figure 2 A schematic diagram of the structure of a dust removal system provided in Embodiment 2 of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a dust removal microporous membrane in a dust removal system provided in the second embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of an electromagnet orifice plate in a dust removal system provided in the second embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the process of pollutant discharge and powder removal in the dust removal system provided in the second embodiment of the present invention.

[0025] Reference numerals:

[0026] 1-mixing barrel; 2-air compressor; 3-atomizer; 4-atomizing nozzle; 5-spray nozzle; 6-dust removal microporous membrane; 7-electromagnetic iron orifice plate; 8-reciprocating drive mechanism; 9-connecting rod; 10-guide rail; 11-box; 12-liquid supply pipe; 13-air supply pipe; 14-liquid regulating valve; 15-air regulating valve; 16-intake dust concentration detector; 17-outlet dust concentration detector; 18-guide trough; 19-sewage collecting trough; 20-connecting shaft; 21-air outlet after dust removal; 22-axial flow fan; 23-dust air inlet; 24-powder collecting trough; 25-mixing impeller; 26-water inlet pipe; 27-mineral powder feeding port; 28-filter gauze; 29-liquid level monitor. DETAILED DESCRIPTION

[0027] 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.

[0028] Embodiment 1

[0029] This embodiment provides a device for preparing a magnetite powder suspension. Figure 1 , comprising a mixing barrel 1, a mixing impeller 25, a water inlet pipe 26, a mineral powder feeding port 27 and a liquid supply pipe 12. The mixing barrel 1 is placed on a mounting surface (e.g., the ground) through a barrel body bracket. The mixing impeller 25 is placed in the mixing barrel 1 and is located at the bottom of the mixing barrel 1. The mixing impeller 25 is rotatably connected to the bottom of the mixing barrel 1 through a bearing. The water inlet pipe 26 is communicated with the lower part of the mixing barrel 1. The water inlet direction of the water inlet pipe 26 is along the tangential direction of the mixing barrel 1. The mineral powder feeding port 27 is opened at the top of the mixing barrel 1. Magnetite powder is added to the mixing barrel 1 through the mineral powder feeding port 27. The liquid supply pipe 12 passes through the top of the mixing barrel 1 and extends to below the liquid level of the mixing barrel 1.

[0030] Compared with the prior art, the device for preparing magnetite powder suspension provided in this embodiment adopts the method of tangential water inlet from the bottom, powder inlet from the top, and liquid extraction from the middle, and the stirring and conveying are integrated in the same stirring drum, with a simple structure.

[0031] On the one hand, the water in the mixing barrel 1 is fully swirled by the tangential water inlet below and the rotation of the stirring impeller 25, thereby strengthening the turbulent effect of the water and promoting the mixing of the water and the magnetite powder, thereby facilitating the generation of a magnetite powder suspension.

[0032] On the other hand, since water is introduced tangentially from the lower part of the mixing barrel 1 and powder is introduced from the upper part, the magnetite powder suspension in the middle part of the mixing barrel 1 is relatively stable and uniform. Liquid is directly taken from the middle part of the mixing barrel 1 through the liquid supply pipe 12, and then connected to the subsequent dust removal device, and supplied to the dust removal device under the negative pressure suction of the subsequent dust removal device for coal dust removal, which can effectively reduce the sedimentation of the magnetite powder suspension during the transportation and filtration process.

[0033] Exemplarily, the water inlet pipe 26 is a straight pipe or an arc-shaped pipe. Preferably, the water inlet pipe 26 is an arc-shaped pipe, that is, the water inlet pipe 26 adopts an asymptote, which can effectively reduce the wear of the wall of the mixing barrel 1 caused by the impact of water.

[0034] In order to filter the magnetite powder suspension entering the liquid supply pipe 12 and avoid clogging subsequent equipment, the above-mentioned magnetite powder suspension preparation device also includes a filter mesh 28 arranged at the liquid inlet end of the liquid supply pipe 12, and the magnetite powder suspension is pre-filtered by the filter mesh 28.

[0035] For example, based on the particle size of the mineral powder being 800 meshes, the aperture of the filter mesh 28 is 200-300 meshes, so that the magnetite powder suspension can be effectively filtered.

[0036] In order to extract a stable and uniform magnetite powder suspension, the ratio of the distance between the top of the stirring impeller 25 and the liquid inlet end of the liquid supply pipe to the distance between the liquid inlet end of the liquid supply pipe and the liquid surface of the stirring barrel 1 is 0.8 to 1.2, that is, the liquid inlet end of the liquid supply pipe is located in the middle position between the top of the stirring impeller 25 and the liquid surface of the stirring barrel 1.

[0037] Exemplarily, the height of the mixing barrel 1 is 1-1.2 m, the height of the mixing impeller 25 is 0.1-0.2 m, the distance between the liquid inlet end of the liquid supply pipe and the bottom of the mixing barrel 1 is 0.4-0.5 m, and the distance between the liquid surface of the mixing barrel 1 and the bottom of the mixing barrel 1 is 0.7-0.8 m.

[0038] Considering that the height of the liquid level in the mixing barrel 1 directly affects the performance of the extracted magnetite powder suspension, the above-mentioned magnetite powder suspension preparation device also includes a liquid level monitor 29 (for example, a hydrostatic liquid level monitor) arranged in the mixing barrel 1, and the liquid level monitor 29 monitors the liquid level of the mixing barrel 1 in real time.

[0039] Embodiment 2

[0040] This embodiment provides a dust removal system. Figure 2, including the preparation device of magnetite powder suspension provided in Example 1.

[0041] Compared with the prior art, the beneficial effects of the dust removal system provided in this embodiment are substantially the same as the beneficial effects of the device for preparing the magnetite powder suspension provided in Example 1, and are not described in detail here.

[0042] Exemplarily, the structure of the dust removal system includes a box 11 and a magnetite powder suspension preparation device, an atomization unit, a spray nozzle 5, and a dust removal microporous membrane 6 (for example, a plastic microporous membrane, see Figure 3 ), electromagnet orifice plate 7 (see Figure 4 ) and an axial flow fan 22, the atomized droplet outlet of the atomizing unit, the spray nozzle 5, the dust removal microporous membrane 6, the electromagnetic orifice plate 7 and the axial flow fan 22 are all located in the box body 11, a dust air flow inlet 23 is provided at one end of the box body 11, and a post-dust removal air flow outlet 21 is provided at the other end; the water spraying direction of the spray nozzle 5 is toward the dust removal microporous membrane 6, and the spray water sprayed by the spray nozzle 5 forms a water film on the dust removal microporous membrane 6; during the dust removal process, the electromagnetic 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 electromagnetic orifice plate 7, and after the dust removal is completed, the electromagnetic 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 electromagnetic orifice plate 7.

[0043] During implementation, the axial flow fan 22 is turned on 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 prepared by the magnetite powder suspension preparation device is sprayed into the box 11 through the atomization unit as atomized droplets of the magnetite powder suspension. While spraying, the magnetite powder in the atomized droplets performs secondary crushing on the atomized droplets to obtain atomized droplets with smaller particle size. 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 primary dust removal, and some of the solid-liquid two-phase droplets gather and fall, while the remaining solid-liquid two-phase droplets continue to flow. 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 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 a water film and flow down in strands; 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 process of the water flow and the water film flowing down, and flows down with the water flow and the water film; the airflow after dust removal passes through the micropores of the dust removal microporous membrane 6 and the plate holes of the electromagnet orifice plate 7, and finally flows out from the air outlet 21 after dust removal, completing the dust removal of the dust airflow; after dust removal, the electromagnet orifice plate 7 is powered off, 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, and the recovery of the magnetite powder is completed.

[0044] The dust removal system of the above structure 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, and has the advantages of simple structure, high automation, high recycling rate, good dust removal effect, etc. On the one hand, by using a magnetite powder suspension as a spray source, the magnetite powder can secondary break the droplets sprayed by 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 has magnetism, and in the process of contact with dust, it can adsorb dust, further enhancing the dust removal effect; on the other hand, an electromagnet orifice plate 7 is arranged behind the dust removal microporous membrane 6, and the dust removal microporous membrane 6 can filter out the droplets entrained with dust, and at the same time form a liquid film to avoid secondary dusting, and the electromagnet orifice plate 7 can adsorb the magnetite powder by electromagnetic means, and the magnetite powder can be recovered and reused by timing power off and demagnetization of the electromagnet orifice plate 7.

[0045] As for the structure of the atomization unit, specifically, it includes 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 supply pipe 12 is connected to the inlet end of the atomizer 3, the air outlet of the air compressor 2 is connected to the inlet end of the atomizer 3 through the 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 inside the box body 11, and the mist outlet direction is the same as the flow direction of the dust airflow.

[0046] It is understandable that in order to adjust the mist output of the atomizing unit and the particle size of the atomized liquid droplets, the atomizing unit further includes a liquid regulating valve 14 disposed on the liquid supply pipe 12 and an air regulating valve 15 disposed on the air supply pipe 13 .

[0047] In order to monitor the dust removal effect in real time, the dust removal system further includes an inlet dust concentration detector 16 disposed at the dust airflow inlet 23 and an outlet dust concentration detector 17 disposed at the airflow outlet 21 after dust removal.

[0048] In order to realize the collection of dust and sewage, the above-mentioned dust removal system also includes a guide groove 18 arranged below the atomized droplet outlet and the spray nozzle 5 and a sewage collecting groove 19 arranged below the dust removal microporous membrane 6. The guide groove 18 is connected to the sewage collecting groove 19, and the guide groove 18 and the sewage collecting 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 collecting 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 collecting 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 dust removal system also includes a powder collecting trough 24 arranged below the dust removal microporous membrane 6. The powder collecting trough 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 powder collecting trough 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 dust removal system 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 dirt collecting groove 19 and the powder collecting groove 24 are arranged in sequence; the dust removal microporous membrane 6 has a dirt discharge state and a powder removal state. When the dust removal microporous membrane 6 is in the dirt discharge state, the dust removal microporous membrane 6 slides along the slide rail to the top of the dirt collecting 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 powder collecting 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 5 , including a guide rail 10, a reciprocating drive mechanism 8 and a connecting rod 9. The dust removal microporous membrane 6 is slidably connected to the box body 11 through the guide rail 10, and the dust removal microporous membrane 6 is connected to the reciprocating drive mechanism 8 through the connecting rod 9. The reciprocating drive mechanism 8 can drive the dust removal 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-removing microporous membrane 6 is in a sewage discharge state and is located at the lowest point of the guide rail 10 (i.e., one end close to the dust airflow inlet 23, where the height of the lowest point is 0). The dust-removing 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 vertical displacement of the dust-removing microporous membrane 6 is adapted through the gap between the through hole and the connecting shaft 20. 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°. The dust-removing microporous membrane 6 is located on the guide rail. 10 (i.e., the end away from the dust airflow inlet 23, the height of the lowest point is 0), the dust-removing microporous membrane 6 gradually moves upward along the guide rail 10, and at the same time, the end of the connecting shaft 20 moves upward in the through hole, and the displacement of the dust-removing microporous membrane 6 in the vertical direction is adapted to the gap between the through hole and the connecting shaft 20; 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 makes the dust immediately detach from the dust-removing microporous membrane 6, and at the same time, the guide rail 10 rotates 180°; repeating the above movement process can achieve complete separation of dust and magnetite powder, see Figure 5 .

[0055] 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 device for preparing a magnetite powder suspension, characterized in that: It includes a mixing barrel, a mixing impeller, a water inlet pipe, a mineral powder feeding port and a liquid supply pipe; The stirring impeller is placed in the stirring barrel and is located at the bottom of the stirring barrel. The water inlet pipe is connected to the lower part of the stirring barrel. The water inlet direction of the water inlet pipe is along the tangent direction of the stirring barrel. The mineral powder feeding port is opened at the top of the stirring barrel. The liquid supply pipe passes through the top of the stirring barrel and extends to below the liquid surface of the stirring barrel.

2. The device for preparing a magnetite powder suspension according to claim 1, characterized in that: The water inlet pipe is a straight pipe or an arc-shaped pipe.

3. The device for preparing a magnetite powder suspension according to claim 1, characterized in that: The stirring impeller is rotatably connected to the bottom of the stirring barrel through a bearing.

4. The device for preparing a magnetite powder suspension according to claim 1, characterized in that: It also includes a filter screen arranged at the liquid inlet end of the liquid supply pipe.

5. The device for preparing a magnetite powder suspension according to claim 4, characterized in that: The pore size of the filter mesh is 200-300 meshes.

6. The device for preparing a magnetite powder suspension according to claim 1, characterized in that: The ratio of the distance between the top of the stirring impeller and the liquid inlet end of the liquid supply pipe to the distance between the liquid inlet end of the liquid supply pipe and the liquid surface of the stirring barrel is 0.8-1.

2.

7. The device for preparing a magnetite powder suspension according to claim 6, characterized in that: The height of the stirring barrel is 1-1.2 m, the height of the stirring impeller is 0.1-0.2 m, the distance between the liquid inlet end of the liquid supply pipe and the bottom of the stirring barrel is 0.4-0.5 m, and the distance between the liquid surface of the stirring barrel and the bottom of the stirring barrel is 0.7-0.8 m.

8. The device for preparing a magnetite powder suspension according to claim 1, characterized in that: Also included is a liquid level monitor arranged in the mixing barrel.

9. The device for preparing a magnetite powder suspension according to claim 8, characterized in that: The liquid level monitor is a static pressure type liquid level monitor.

10. A dust removal system, characterized in that: A device for preparing a magnetite powder suspension comprising the device as claimed in any one of claims 1 to 9.

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