LU501753B1 - Low-resistance Venturi Electrostatic Water Film Dust Collector - Google Patents

Abstract

Venturi tube comprising a contraction section having a small caliber section communicating with a throat section, the two ends of the throat section have the same caliber, the throat section communicates with an expansion section, the caliber of the end of the expansion section away from the throat section is larger than that of the throat section, a plurality of first nozzles are arranged on the throat section; a plurality of second nozzles are fixedly connected on the inner side wall of the cyclone, the second nozzles face the side wall of the cyclone, the expansion section communicates with the cyclone, the top end of the cyclone is fixedly connected with a top cover provided with an exhaust pipe having an exhaust fan, the bottom end of the cyclone is provided with a water outlet which communicates with a circulating water tank communicating with the first and the second nozzles.

Description

DESCRIPTION LU501753 Low-resistance Venturi Electrostatic Water Film Dust Collector

TECHNICAL FIELD The invention relates to the technical field of dust collectors, and in particular to a low-resistance venturi electrostatic water film dust collector.

BACKGROUND Due to the needs of China's economic development, China's industrial scale is huge. However, the speed of energy consumption is accelerating, which leads to the serious decline of air quality in China, which has affected people's daily life and even caused great damage to health. The main pollutant in the air is inhalable particles. When inhalable particles are inhaled by people, the smaller the diameter, the deeper the part that can enter the respiratory tract. Inhalable particles are mainly produced through two ways: the first way is to be discharged into the atmosphere without purification in various industrial production (metallurgy, internal combustion engine, coal combustion, chemical production, etc.); the second way is the secondary formation of ultrafine particles and aerosols in the atmosphere. Under the background that the state is paying more and more attention to environmental governance, the requirements for air quality are getting higher and higher.

SUMMARY The purpose of the present invention is to provide a low-resistance venturi electrostatic water film dust collector to solve the above-mentioned problems in the prior art, reduce the dust content in gas, improve the cleanliness of gas and meet the requirements of gas dust removal.

In order to achieve the above purpose, the present invention provides the following scheme: the present invention provides a low-resistance venturi electrostatic water film dust collector, which comprises: a venturi tube, which comprises a contraction section with a large caliber end and a small caliber end, the small caliber section of the contraction section is communicated with a throat section, both ends of the throat section have the same caliber, and the throat section is communicated with an expansion section, the caliber of the end of the expansion section far away from the throat section is larger than that of the throat section, the throat section is provided with a plurality of first nozzles, and the water outlet ends of the first nozzles face into the throat}501753 section; a cyclone, the inner side wall of which is fixedly connected with a plurality of second nozzles, the second nozzles face the side wall of the cyclone, the expansion section is communicated with the cyclone, the top end of the cyclone is fixedly connected with a top cover, the top cover is provided with an air outlet, the air outlet is communicated with an exhaust pipe, the exhaust pipe is provided with an exhaust fan, the bottom end of the cyclone is provided with a water outlet, and the water outlet is communicated with a circulating water tank, and the circulating water tank is respectively connected with the first nozzles and the water tank.

Preferably, the throat section is provided with a plurality of through holes, the through holes are internally provided with the first nozzles, a first water pump is installed between the first nozzles and the circulating water tank, the first nozzles, the first water pump and the circulating water tank are communicated through a water pipe, and an electromagnetic valve is installed on the water pipe between the first water pump and the circulating water tank.

Preferably, a second water pump is communicated between the second nozzles and the circulating water tank, and the second nozzles, the second water pump and the circulating water tank are communicated through the water pipe, which penetrates through the side wall of the cyclone, and the electromagnetic valve is installed on the water pipe between the second water pump and the circulating water tank.

Preferably, a filter is installed at one end of the water pipe near the circulating water tank, and the filter is respectively communicated with the first water pump and the second water pump through the water pipe.

Preferably, a straight pipe section is communicated between the expansion section and the cyclone, and a plurality of layers of vibrating grids are fixedly connected in the straight pipe section, and a sewage outlet is arranged on the straight pipe section, the sewage outlet is located at the bottom of the vibrating grid, and the sewage outlet is communicated with a sewage pipe which is communicated with the circulating water tank.

Preferably, an air volume control valve is installed on the straight pipe section.

Preferably, the large caliber end of the contraction section is fixedly connected with 4501753 extension section, a blower is fixedly installed on the extension section, and the air outlet end of the blower extends into the extension section.

Preferably, an electrode penetrates through the top cover, and the electrode is electrically connected with a high-voltage power supply.

Preferably, the electrode comprises a trunk, and the trunk, which is fixedly connected with several branches, and the branches are divided into several layers, and there are four branches in each layer, and the branches in each layer are in the same plane.

Preferably, the circulating water tank is provided with a mud outlet.

The invention discloses the following technical effects: the device is provided with an exhaust fan; after the exhaust fan is turned on, negative pressure is generated in the device, and gas enters a venturi tube, which comprises a contraction section, a throat section and an expansion section; after the dusty airflow enters the contraction section of the venturi tube, the speed of the airflow gradually increases, when the airflow enters the throat section, the airflow speed increases to the maximum value, and the first nozzles spray water into the throat section; the high-speed dust flow in the throat section changes the water flow into a droplet shape due to the impact, and wets the dust particles; after the airflow enters the expansion section, the wetting speed of the dust particles decreases, and then gradually merges into larger dust particles; when the mixed airflow enters the cyclone, it will change from a linear motion state to a circular motion state; when the dust particles in the mixed airflow touch the cyclone sidewall, it will lose its inertia force and gradually adhere to the cyclone sidewall; the second nozzles will spray the water flow to the cyclone sidewall, which will adhere to the cyclone; the second nozzles spray water to the side wall of the cyclone, and the water washes the dust particles adhered to the side wall of the cyclone, flows to the water outlet, and flows to the circulating water tank through the water outlet; the device has a simple structure, which significantly reduces the dust content in the gas, improves the cleanliness of the gas and meets the requirements of gas dust removal.

BRIEF DESCRIPTION OF THE FIGURES In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in the field, other drawings can be obtainéd/501753 according to these drawings without paying creative labor.

FIG. 1 is a schematic diagram of the structure of the low-resistance venturi electrostatic water film dust collector of the present invention; FIG. 2 1s a schematic diagram of the electrode structure of the present invention; FIG. 3 is a top view of the electrode of the present invention; FIG. 4 is a schematic diagram of the vibrating grid structure of the present invention; FIG. 5 is a schematic structural diagram of venturi tube according to embodiment 2 of the present invention; FIG. 6 is a position diagram of the first nozzle according to embodiment 2 of the present invention; FIG. 7 is a schematic diagram of the working mechanism of the first nozzle in embodiment 2 of the present invention; FIG. 8 is a schematic diagram of the vibrating grid structure in embodiment 2 of the present invention; FIG. 9 is a physical view of vibrating grid according to embodiment 2 of the present invention; FIG. 10 is a pipeline layout diagram of the second nozzle according to embodiment 2 of the present invention; FIG. 11 is a connection form of the second water pump and the second nozzle according to embodiment 2 of the present invention; FIG. 12 is a schematic diagram of corona electrode structure according to embodiment 2 of the present invention; among them, 1. contraction section; 2. throat section; 3. expansion section; 4. first nozzle; 5. cyclone; 6. second nozzle, 7. top cover; 8. exhaust pipe; 9. exhaust fan; 10. water outlet; 11. circulating water tank; 12. first water pump; 13. electromagnetic valve; 14. second water pump;

15. filter; 16. straight pipe section; 17. vibrating grid; 1701. solder joint; 1702. threaded iron bar;

1703. nylon filament; 18. sewage outlet; 19. sewage pipe; 20. air volume control valve; 21. extension section; 22. blower; 23. high-voltage power supply; 24. trunk; 25. branch; 26. mud outlet; 27. prickle; 28. spike; 29. corona electrode.

DESCRIPTION OF THE INVENTION LU501753 Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of the present invention.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention will be described in further detail below with reference to the drawings and detailed description.

Embodiment 1 Referring to Figs. 1-4, the present invention provides a low-resistance venturi electrostatic water film dust collector, which comprises: a venturi tube, which comprises a contraction section 1 with a large caliber end and a small caliber end, wherein the small caliber section of the contraction section 1 is connected with a throat section 2, both ends of the throat section 2 have the same caliber, and the throat section 2 is connected with an expansion section 3, the caliber of the expansion section 3 at the end away from the throat section 2 is larger than that of the throat section 2, and the throat section 2 is provided with a plurality of first nozzles 4, and the water outlet ends of the first nozzles 4 face into the throat section 2; dusty airflow enters the contraction section 1 of venturi tube, because the flow area of contraction section 1 is getting smaller and smaller, the static pressure in contraction section 1 is continuously transformed into dynamic pressure, which further increases the velocity of dusty airflow in the tube; when the airflow enters the throat section 2, the cross-sectional area of the duct has been reduced to the minimum, the flow pressure of dusty airflow has increased to the maximum, that is, the flow velocity of dusty airflow has increased to the maximum, and the dusty airflow enters the expansion section 3, where the continuous increase of the cross-sectional area of the duct reduces the flow pressure of dusty airflow in the tube; the velocity of dusty airflow is also reduced, and the water jet from the first nozzle 4 to the throat section 2, because there is a high velocity of dusty airflow in the throat section 2, causes the water jet from the first nozzle 4 to be impacted by the high velocity of dusty airflow and then become droplets, and is fully mixed with the dusty airflow, finally wetting the dust particleds}501753 when the airflow enters the expansion section 3, the wetting dust particles speed is reduced, and then gradually merge into larger dust-laden particles.

A cyclone 5, the inner side wall of which is fixedly connected with a plurality of second nozzles 6, the second nozzles 6 face the side wall of the cyclone 5, the expansion section 3 is communicated with the cyclone 5, the top end of the cyclone 5 is fixedly connected with a top cover 7, the top cover 7 is provided with an air outlet, the air outlet is communicated with an exhaust pipe 8, the exhaust pipe 8 is provided with an exhaust fan 9, and the bottom end of the cyclone 5 is provided with a water outlet 10, which is communicated with a circulating water tank 11, and the circulating water tank 11 is respectively connected with the first nozzles 4 and the second nozzles 6; after the exhaust fan 9 is turned on, it exhausts air outwards, which makes the device generate negative pressure; the airflow enters from the end of the contraction section 1, and the airflow containing water and dust particles enters into the cyclone 5 from the expansion section 3; in this embodiment, the lower part of the cyclone 5 is inverted cone, that is, the water outlet 10 is the part with the smallest diameter of the cyclone 5, and the expansion section 3 is connected to the tangent of the cyclone 5; when the mixed airflow flows into the cyclone 5 from the tangential air inlet, it will change from a linear motion state to a circular motion state; the rotating mixed airflow will start from the side wall of cyclone 5, flow downward along the cyclone 5 in the cone direction and take a spiral shape; when the dust particles in the mixed airflow touch the side wall of cyclone 5, they will lose their inertia force and gradually adhere to the side wall of cyclone 5; the circulating water tank 11 provides water for the first nozzles 4 and the second nozzles 6, and the second nozzles 6 spray water flow to the side wall of cyclone 5, which washes the dust particles adhered to the side wall of cyclone 5, and the washed water flow flows to the water outlet 10 and then flows to the circulating water tank through the water outlet

10.

In a further optimization scheme, the throat section 2 is provided with a plurality of through holes, in which the first nozzles 4 penetrate, and a first water pump 12 is installed between the first nozzles 4 and the circulating water tank 11, and the first nozzles 4, the first water pump 12 and the circulating water tank 11 are communicated through a water pipe, and the water pipe between the first water pump 12 and the circulating water tank 11 is installed with an electromagnetic valve 13; the first water pump 12 provides pressurized water to the first nozzl&$)501753 4, which makes the water flow sprayed from the first nozzles 4 finer and increases the mixing effect with the dusty airflow; the electromagnetic valve 13 is used to adjust the water flow of the first nozzles 4.

In a further optimization scheme, a second water pump 14 is communicated between the second nozzles 6 and the circulating water tank 11, and the second nozzles 6, the second water pump 14 and the circulating water tank 11 are communicated through a water pipe which penetrates through the side wall of the cyclone 5, and an electromagnetic valve 13 is installed on the water pipe between the second water pump 14 and the circulating water tank 11; the second water pump 14 provides the pressurized water source to the second nozzles 6, which increases the cleaning effect of washing the cyclone 5 with the water jet from the second nozzles 6.

In a further optimization scheme, a filter 15 is installed at one end of the water pipe near the circulating water tank 11, and the filter 15 is respectively communicated with the first water pump 12 and the second water pump 14 through the water pipe; the filter 15 filters the water extracted from the circulating water tank 11, so that the water flowing to the first nozzle 4 and the second nozzle 6 is cleaner.

In a further optimization scheme, a straight pipe section 16 is provided with a sewage outlet 18, which is located at the bottom of the vibrating grids 17, the sewage outlet 18 is connected with a sewage pipe 19, and the sewage pipe 19 is connected with the circulating water tank 11; when the mixed airflow passes through the vibrating grids 17, the strings in the vibrating grids 17 will vibrate and generate sound waves; dust particles will vibrate due to the influence of the sound waves generated by the vibrating grids 17; the smaller the diameter of dust particles, the greater the vibration speed they will receive; therefore, the particles with different particle sizes will agglomerate at different speeds, so that the small particles in the mixed airflow will keep approaching the large particles, which will cause collision, condensation and then settlement; the settled dust particles will be mixed with water in a mud state, flow out of the sewage outlet 18 and flow to the circulating water tank 11 through the sewage pipe 19.

In a further optimization scheme, an air volume control valve 20 is installed on the straight pipe section 16, and the air volume control valve 20 is used to adjust the air volume passing through the straight pipe section 16.

In a further optimization scheme, the large caliber end of the contraction section 1 is fixedls501753 connected with an extension section 21, and a blower 22 is fixedly installed on the extension section 21, and the air outlet end of the blower 22 extends into the extension section 21; the blower 22 blows air into the extension section 21, so that the venturi tube can quickly reach the maximum ventilation state.

In a further optimization scheme, the top cover 7 is internally provided with an electrode which is electrically connected with a high-voltage power supply 23; the high-voltage power supply supplies high-voltage electricity to the electrodes, ionizes the air into ions, and then the ions move directionally under the action of electric field force; in this process, they collide with dust particles, adhere to the dust particles, and transfer the charges to the dust particles; when the dust particles are charged, they move to the side wall of cyclone 5 under the action of electrostatic force and airflow, and are finally washed away by water flow.

In a further optimization scheme, the electrode comprises a trunk 24, which is fixedly connected with several branches 25; the branches 25 are divided into several layers, there are four branches 25 in each layer, and the branches 25 in each layer are in the same plane; in this embodiment, among several layers of branches 25, from bottom to top, the length of the branches 25 increases continuously, and each layer of branches 25 keeps the same distance from the shape of the side wall of the cyclone 5; in order to increase the uniformity of electric field, the included angle between every two adjacent branches 25 is 90°; through the above arrangement, the electric field generated by the trunk 24 and the branches 25 can be more uniform.

In a further optimization scheme, the circulating water tank 11 is provided with a mud outlet 26; dust-removed water in the circulating water tank 11 is precipitated to form mud, which is discharged through the mud outlet 26.

The use method of the device is that the exhaust fan 9 is turned on, and negative pressure is generated in the device; the airflow enters from the extension section 21 and then enters the throat section 2 after the contraction section 1; at this time, the velocity of the dusty airflow reaches the maximum; under the action of the first water pump 12, the water with high pressure is sprayed from the first nozzles 4, and the water sprayed from the first nozzles 4 is impacted by the high-speed dust flow and then becomes droplets, and is fully mixed with the dusty airflow to wet the dust particles; when the airflow enters the expansion section 3, the velocity of wettidgJ501753 dust particles decreases, and gradually merge into larger dust containing micro particles; after the mixed airflow enters the straight pipe section 16, it impacts the vibrating grids 17, causing vibration and sound waves; the dust particles vibrate due to the influence of the sound waves generated by the vibrating grids 17, so that the small particles in the mixed airflow keep approaching the large particles, causing collision, condensation and further settlement; the settled dust particles are mixed with water in a mud state, flowing out from the sewage outlet 18 and flowing to the circulating water tank 11 through the sewage pipe 19, thus completing the preliminary purification. When the mixed airflow flows into the cyclone 5 through the straight pipe section 16 from the tangential air inlet, it will change from the linear motion state to the circular motion state; the rotating mixed airflow will start from the side wall of the cyclone 5 and flow downward along the cyclone 5 to the cone direction in a spiral shape; when the dust particles in the mixed airflow touch the wall surface, they will lose their inertia force and gradually adhere to the side wall of the cyclone 5. The electrode electrically connected with the high-voltage power supply 23 ionizes the air into ions, which collide with dust particles and attach to dust particles, and transfer charges to the dust particles; when the dust particles are charged, they move to the side wall of the cyclone 5 under the action of electrostatic force and airflow; the second nozzles 6 spray water flow to the side wall of the cyclone 5, and the water flow washes the dust particles attached to the side wall of the cyclone 5; the washed water flow flows to the water outlet 10, and flows to the circulating water tank 11 through the water outlet 10; the water in the circulating water tank 11 is precipitated to form mud, which is discharged through the mud outlet 26.

Embodiment 2 Referring to Figs. 5- 12, in this embodiment, the low-resistance venturi tube is round, because the four corners of the rectangular pipe section can not be effectively covered by water mist, and the dust removal effect is poor; compared with the circular pipe, the processing of the rectangular pipe is more complicated, the processing cost is higher, and the consumables are more; the pipe materials are all made of iron sheet.

The low-resistance venturi tube includes a contraction section 1, which has a large caliber end and a small caliber end; the small caliber section of the contraction section 1 is connected with a throat section 2; both ends of the throat section 2 have the same caliber, and the throkt/501753 section 2 is connected with an expansion section 3; the caliber of the end of the expansion section 3 away from the throat section 2 is larger than that of the throat section 2; the throat section 2 is provided with a plurality of first nozzles 4, and the water outlet ends of the first nozzles 4 face into the throat section 2.

The dust content of the device can be adjusted according to the needs; the rated dust content of the device is 850 m°/h, so the gas velocity of throat section 2 of low-resistance venturi tube should consider the dust concentration, particle size, the gas content and physical and chemical properties of liquid, the efficiency and resistance of dust collector, etc.; it is determined that the geometric parameters of low-resistance venturi tube should meet the basic requirements of high dust removal efficiency and low fluid resistance. However, the wind speed in the throat section 2 of the traditional low-resistance venturi water film dust collector is extremely high; for sub-micron dust particles, the wind speed in the throat section 2 is generally 90-120 m/s with high resistance. Therefore, it is determined that the gas velocity of throat section 2 of low-resistance venturi electrostatic water film precipitator is 30 m/s. The geometric parameters of the low-resistance venturi tube are shown in FIG. 5.

The structural parameters of the low-resistance venturi tube such as pipe length, diameter and cross-sectional area have been calculated as shown in Table 1.

Cross sectional Table 1 The throat section 2 is provided with a plurality of through holes, through which water pipes penetrate, and the water pipes are communicated with the first nozzles 4; a first water pump 12 is installed between the first nozzles 4 and the circulating water tank 11, and the first nozzles 4, the first water pump 12 and the circulating water tank 11 are communicated with each other through water pipes, and an electromagnetic valve 13 is installed on the water pipé/501753 between the first water pump 12 and the circulating water tank 11.

The difference between this embodiment and the first embodiment is that the number of the first nozzles 4 is one, the water pipe penetrates in the extension section 21, the first nozzle 4 is located in the center of the contraction section 1, and the water outlet direction is toward the throat section 2; the axial spray is radially sprayed outwards, which can improve the relative speed of the dispersed water mist particles and the airflow and make the water mist particles as evenly distributed as possible on the entire throat section. In this embodiment, the wind speed in the throat section 2 of the low-resistance venturi tube is at a low value, and the atomization pressure of the first nozzle 4 is increased to improve the atomization effect and the dust removal efficiency. In the axial spray of radial outward spray, a single first nozzle 4 is arranged in the center of the contraction section 1, the spray direction is consistent with the dusty airflow, and the spray range covers the radial range of the throat section 2.

In this embodiment, the first nozzle 4 of low-resistance venturi radial outward spray is arranged at the center of the contraction section 1, the first nozzle 4 is arranged on the central axis of the contraction section 1, the nozzle of the first nozzle 4 is 16 cm away from the center of the front side of the throat section 2, and the atomization angle can be changed by adjusting the water supply pressure valve. As shown in FIG. 6, when the atomization angle is 80°, the water mist particles sprayed by the first nozzle 4 bounce back to the center line of the throat section 2 at the inner wall of the contraction section 1.

The working mechanism is shown in FIG. 7; high-pressure water is sprayed by the first nozzle 4 along the center of the contraction section 1 to form uniform water mist; the water mist particles are all over the throat section 2, and a negative pressure area is formed behind the spray jet. When the dusty airflow passes through the contraction section 1, the flow velocity begins to increase, and the dusty airflow will be sucked into the spray area by the spray field in the low-resistance venturi tube and the negative pressure field behind it, and the dust-laden flow velocity will further increase, and the diffusion range will be enlarged, so that the water mist particles can fully contact and mix with the dusty airflow. When it reaches the throat section 2, the airflow speed reaches the maximum, and the collision probability further increases. At the expansion section 3, the airflow speed decreases, and the dust particles further collide and condense with the dusty airflow to form dusty droplets. Most of the dust is trapped when Lt/501753 collides with the vibrating grids arranged in the inlet section of the water film dust collector.

A straight pipe section 16 is communicated between the expansion section 3 and the cyclone 5, and several layers of vibrating grids 17 are fixedly connected in the straight pipe section 16; the straight pipe section 16 is provided with a sewage outlet 18 located at the bottom of the vibrating grids 17, and the sewage outlet 18 is communicated with a sewage pipe 19 which is communicated with the circulating water tank 11.

In this embodiment, the vibrating grid 17 uses nylon filament with a diameter of 0.3 mm as the vibrating wire; FIG. 8 and FIG. 9 are the structural schematic diagram and physical diagram of vibrating grid 17, respectively. The vibrating grid frame has a parameter of 190 mmx190 mm, and is welded with 10 mm threaded iron bars 1702; there are solder joints 1701 at the welding points of two threaded iron bars 1702; then, nylon filaments 1703 are wound along the threads, and the winding density should meet the industrial requirements.

Dust-containing particles play an important role in dust filtration and collection after being atomized and condensed by venturi tube. The vibrating grid installed in the inlet section of water film dust collector is the influencing factor of dust removal efficiency, so the manufacturing requirements of vibrating grid must meet the industrial demand. The number of vibrating grids, spacing between vibrating wires and materials all have influences on dust removal efficiency and resistance loss, and the low-resistance venturi coupling vibrating grids can start coagulation and dust removal effect.

À plurality of second nozzles 6 are fixedly connected to the inner side wall of the cyclone 5, the second nozzles 6 face the side wall of the cyclone 5, the expansion section 3 is communicated with the cyclone 5, the top end of the cyclone 5 is fixedly connected with a top cover 7, the top cover 7 is provided with an air outlet, the air outlet is communicated with an exhaust pipe 8, the exhaust pipe 8 is provided with an exhaust fan 9, the bottom end of the cyclone 5 is provided with a water outlet 10, the water outlet 10 is communicated with a circulating water tank 11, and the circulating water tank 11 is communicated with the first nozzle 4 and the second nozzles 6 respectively.

The wet water film dust removal cyclone is sprayed with water from the second nozzles 6, and a layer of continuously flowing water film is formed on the wall of the cyclone 5 to enhance the adsorption of dust on the wall of the cyclone 5. Dusty water mist is trapped by vibrating grid$J501753 17 in low-resistance venturi tube, tangentially enters cyclone 5 and then moves in a high-speed circular motion; under the action of centrifugal force, it moves to the cylinder wall, is easily caught by flowing water film and flows to circulating water tank 11 at the bottom of dust collector. Different from cyclone dust collector, which is easy to generate secondary dust, under the action of water film, the trapped dust particles will flow into the bottom of the dust collector along the cylinder wall. At the same time, the water film dust collection plate can enhance the collection of charged dust, and at the same time solve the problem that the dust collection plate of electrostatic precipitator is difficult to clean. A traditional ash hopper is converted into a circulating water tank 11, and a first water pump 12 and a second water pump 14 take water from the circulating water tank 11 to form a film. This can recycle water and save resources.

Water film has a strong adsorption effect on dust, but its uniformity has always been one of the difficulties of this kind of dust collector. The second nozzles 6 are arranged along the tangential direction of the cylinder wall to generate water film, so that the generated water film is stable; considering that too few nozzles will affect the quality of water film, and too many nozzles will lead to redundant pipelines and increased flow field resistance, the number of second nozzles 6 is set to four, and a sealing union 601 and a universal joint pipe 602 are installed between the water pipe and the second nozzle 6, and the second nozzle 6 is communicated with the universal joint pipe 602.

A second water pump 14 is communicated between the second nozzles 6 and the circulating water tank 11, and the second nozzles 6, the second water pump 14 and the circulating water tank 11 are communicated through a water pipe which penetrates through the side wall of the cyclone 5, and an electromagnetic valve 13 is installed on the water pipe between the second water pump 14 and the circulating water tank 11.

In order to obtain a stable flow rate conveniently, the second water pump 14 is used to manufacture the water film. The tube diameter of the low-resistance venturi electrostatic water film dust collector of the invention is determined to be 0.5 m, the effective length of the water film is about 1 m, the calculated water pump flow is 15 L/min, and the 1ZDB6S self-priming clean water pump is selected, with a power of 0.75 kW, a rated flow of 20 L/min and a rated lift of 20 m.

A filter 15 is installed at one end of the water pipe near the circulating water tank 11, add/501753 the filter 15 is respectively communicated with the first water pump 12 and the second water pump 14 through the water pipe.

In order to make the water film cling to the cylinder wall, a flat duckbill second nozzle 6 is installed along the cylinder wall. The second nozzle 6 is arranged according to the pipeline arrangement as shown in FIG. 10. The duckbill nozzle has the best film forming effect, and can produce uniform, continuous, stable and large water film. Under the condition of installing a water pump, the four second nozzles 6 at the positions of the cylinder wall have different line lengths relative to the water pump, that is, the power supply pressure is different, and the arrangement of the lines adopts the series-parallel hybrid method, as shown in FIG. 11. Therefore, the water film pipeline of the dust collector cylinder adopts the series-parallel mixed pipeline structure.

An electrode penetrates through the top cover 7, and the electrode is electrically connected with a high-voltage power supply 23. The pole comprises a trunk 24, which is fixedly connected with several branches 25; the branches 25 are divided into several layers; there are four branches in each layer, and the branches 25 in each layer are in the same plane.

In this embodiment, because of the particularity of installing corona electrode wires in the internal flow field of cyclone 5, cage-type needle-punched corona electrode wires are used. As the cylinder of cyclone 5 is a cone, the electrodes are divided into four layers in proportion; the distance between the dust collection plate and a corona electrode 29 is controlled at about 120 mm, the length of a prickle 27 is 75 mm and reduced to about 53 mm, and the length of a spike 28 is 10 mm. According to the above potential gradient distribution law, as far as possible, the electric field with uniform distribution in the ring can be achieved.

Cage-type needle-punched corona wire: on the basis of the prickle 27, a cage-type design is added, so that the overall potential of the three-dimensional space around the corona wire is relatively uniform, the average field strength of the electric field is improved, and then the electric field is discharged to the anode plate through the tip.

Under the given heteropolar distance, the negative high-voltage DC voltage of corona electrode should not exceed 60 kv, otherwise there is a risk of flashover spark discharge, short circuit of anode plate breakdown and even electric arc, so the maximum operating voltage of the high-voltage power supply of the low-resistance venturi electrostatic water film dust collector 68501753 the present invention is determined to be 60 kV. ZPS-100 negative high-voltage DC power supply is adopted, with input voltage of 220 V AC, output voltage of 0 kV-70 kV and output power of 30 W. It can realize the steady rise of output high-voltage line and stable output of voltage and current.

The insulation methods mainly include the insulation of tuyere section at cathode corona electrode wire, grounding of high-voltage power supply, grounding of anode cylinder wall and grounding of water pump and fan. Cathode corona electrode wire enters the cylinder from the axis just above the air outlet, using PTFE pipe with outer diameter of 4 cm and inner diameter of 1 cm, that is, wall thickness of 1.5 cm, which is embedded outside the guide screw steel with an insulation length of about 1 m to prevent it from being broken down outside the discharge area (mainly refers to a section of galvanized exhaust pipe). The high-voltage output terminal of the high-voltage power supply is wrapped by PTFE plastic pipe, but the shell of the power supply may accumulate electric charge, so the shell must be grounded during operation. In addition to the ground wire provided by itself, several additional ground wires are added. The anode cylinder wall is the direct receiving object of corona discharge charge, so it is necessary to ensure good grounding performance in any case. Therefore, several ground wires are set up around the cylinder wall, especially in the conical discharge area and the air inlet insulation area. In order to move the dust collector flexibly, the water pump and the fan are welded in the integral angle steel frame of the dust collector to be grounded, but the ground wire is still separately set for the outer shell.

In this embodiment, the basic particles discharged by the air-water mixture are mostly negative ions, and the electronegativity of water molecules is strong. Air-water mixture discharge produces more species (positive and negative ions and hydrated electrons) than air discharge. The number of collisions per second in water mist is larger than that in air. The discharge of air-water mixture is more conducive to charging and higher voltage, and the corona charging of air-water mixture is more effective than that of air. Water mist charging has experienced three stages: induction charging, corona charging transition and corona charging; corona voltage has the greatest influence on the charge-mass ratio of water mist, the current of water mist cloud and the power injected into water mist cloud. Water mist can improve the charging efficiency of dust and enhance the ability of vibrating grid to capture charged water mist containing dust; thé/501753 charged vibrating grid has high dust removal efficiency. Gas-liquid-solid three-phase simulation shows that the dust particles move orderly to the outlet with the airflow after passing through the spray area, and the vibrating grid can effectively filter the dusty water mist particles. After adding the spray, the dust collector can obviously improve the dust particle trapping effect. The dust collector of this embodiment has a dust reduction rate of 93.14% for fine dust and 99.50% for ordinary talcum powder. The device has high removal efficiency of fine dust, convenient dust removal and no secondary dust, and has a good application prospect.

In the description of the invention, it should be understood that the azimuth or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on is based on the azimuth or positional relationship shown in the attached drawings for the convenience of describing the invention, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, it cannot be understood as a limitation of the present invention.

The above-mentioned embodiments only describe the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, all kinds of modifications and improvements made by ordinary technicians in the field to the technical scheme of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims (10)

CLAIMS LU501753

1. A low-resistance venturi electrostatic water film dust collector, characterized by comprising: a venturi tube, which comprises a contraction section (1), wherein the contraction section (1) has a large caliber end and a small caliber end; the small caliber section of the contraction section (1) is communicated with a throat section (2); both ends of the throat section (2) have the same caliber; the throat section (2) is communicated with an expansion section (3); the caliber of the expansion section (3) at the end away from the throat section (2) is larger than that of the throat section (2), and the throat section (2) is provided with a plurality of first nozzles (4), and the water outlet ends of the first nozzles (4) face into the throat section (2); a cyclone (5), a plurality of second nozzles (6) are fixedly connected on the inner side wall of the cyclone (5), the second nozzles (6) face the side wall of the cyclone (5), the expansion section (3) is communicated with the cyclone (5), a top cover (7) is fixedly connected to the top of the cyclone (5), and the top cover (7), the top cover (7) is provided with an air outlet, the air outlet is communicated with an exhaust pipe (8), the exhaust pipe (8) is provided with an exhaust fan (9); the bottom of the cyclone (5) is provided with a water outlet (10), and the water outlet (10) is communicated with a circulating water tank (11), which is respectively communicated with the first nozzles (4) and the second nozzles (6).

2. The low-resistance venturi electrostatic water film dust collector according to claim 1, characterized in that the throat section (2) is provided with a plurality of through holes, in which the first nozzles (4) penetrate, and a first water pump (12) is installed between the first nozzles (4) and the circulating water tank (11), and the first nozzles (4), the first water pump (12) and the circulating water tank (11) are communicated through a water pipe, and the water pipe between the first water pump (12) and the circulating water tank (11) is installed with an electromagnetic valve (13).

3. The low-resistance venturi electrostatic water film dust collector according to claim 2, characterized in that a second water pump (14) is communicated between the second nozzles (6) and the circulating water tank (11), and the second nozzles (6), the second water pump (14) and the circulating water tank (11) are communicated through a water pipe which penetrates through the side wall of the cyclone (5), and an electromagnetic valve (13) is installed on the water pip&}501753 between the second water pump (14) and the circulating water tank (11).

4. The low-resistance venturi electrostatic water film dust collector according to claim 3, characterized in that a filter (15) is installed at one end of the water pipe near the circulating water tank (11), and the filter (15) is respectively communicated with the first water pump (12) and the second water pump (14) through the water pipe.

5. The low-resistance venturi electrostatic water film dust collector according to claim 1, characterized in that a straight pipe section (16) is communicated between the expansion section (3) and the cyclone (5), several layers of vibrating grids (17) are fixedly connected in the straight pipe section (16); the straight pipe section (16) is provided with a sewage outlet (18), which is located at the bottom of the vibrating grids (17), the sewage outlet (18) is connected with a sewage pipe (19), and the sewage pipe (19) is connected with the circulating water tank (11).

6. The low-resistance venturi electrostatic water film dust collector according to claim 5, characterized in that the straight pipe section (16) is provided with an air volume control valve (20).

7. The low-resistance venturi electrostatic water film dust collector according to claim 1, characterized in that the large caliber end of the contraction section (1) is fixedly connected with an extension section (21), on which a blower (22) is fixedly installed, and the air outlet end of the blower (22) extends into the extension section (21).

8. The low-resistance venturi electrostatic water film dust collector according to claim 1, characterized in that the top cover (7) is internally provided with an electrode which is electrically connected with a high-voltage power supply (23).

9. The low-resistance venturi electrostatic water film dust collector according to claim 8, characterized in that the electrode comprises a trunk (24), which is fixedly connected with several branches (25); the branches (25) are divided into several layers, there are four branches (25) in each layer, and the branches (25) in each layer are in the same plane.

10. The low-resistance venturi electrostatic water film dust collector according to claim 1, characterized in that the circulating water tank (11) is provided with a mud outlet (26).