An ash cleaning device for an electric precipitator and a method of using the same

Abstract

The application relates to a dust cleaning device for an electric dust collector and a use method thereof, which comprises an electric dust collector shell wall plate, further comprises a liquid nitrogen dust removal device, the liquid nitrogen dust removal device is fixedly arranged on the electric dust collector shell wall plate, one end of the liquid nitrogen dust removal device penetrates through the electric dust collector shell wall plate and extends into the electric dust collector, the liquid nitrogen dust removal device comprises a launching tube and a liquid nitrogen spraying pipe fixed to the bottom of the launching tube, one end of the launching tube is provided with a cyclone air inlet, the other end of the launching tube located in the electric dust collector is provided with a launching port, and a water inlet pipe is communicated with the launching tube; the inside of the liquid nitrogen spraying pipe is communicated with the inside of the launching tube through a liquid nitrogen shunt pipe, and one end of the liquid nitrogen spraying pipe located in the electric dust collector is provided with a liquid nitrogen atomizing nozzle; water drops dripped by the water inlet pipe flow into liquid nitrogen through the liquid nitrogen shunt pipe, the liquid nitrogen is frozen into ice beads, and the ice beads are sprayed out through the launching port to wet the anode plate in the electric dust collector, so that stubborn dust attached to the dust collecting electric plate can be completely removed.

Description

Technical Field

[0001] This invention relates to a dust removal device for electrostatic precipitators and its usage method, belonging to the field of electrostatic precipitator dust removal technology. Background Technology

[0002] The technical principle of an electrostatic precipitator is to ionize the flue gas with high voltage using a negatively charged discharge electrode, which generates a large number of negative ions. These negative ions are attracted to the dust particles in the flue gas, causing the dust particles to become negatively charged. Due to the principle of attraction between opposite charges, the negatively charged dust particles move towards the grounded anode dust collection plate and are captured by the anode dust collection plate.

[0003] CN118218134A discloses a vibratory hammer for filter plates of electrostatic precipitators and a hammering method thereof. The vibratory hammer is driven by a rapping motor, which drives a hammering rod to strike the striking plate, thereby achieving the knocking and dust removal of the dust collecting plate.

[0004] In existing technologies, when the anode dust collection plates need cleaning, a motor installed outside the dust collector drives a vibrating shaft to rotate. The vibrating shaft extends into the dust collector through the side wall panel, and vibrating hammers are mounted on the shaft. The rotation of the vibrating shaft causes the vibrating hammers to strike the vibrating rods at the bottom of the anode plates, causing the anode plates to vibrate and thus dislodging the dust from the anode plates. However, the following problems exist.

[0005] 1. Electrode filter plates closer to the tapping point vibrate more strongly and have a better dust removal effect, while electrode filter plates farther away from the tapping point vibrate less strongly and have a poorer dust removal effect, and may even have cleaning blind spots.

[0006] 2. Stubborn dust adhering to the dust collection plate is difficult to remove completely. Summary of the Invention

[0007] In order to solve the above-mentioned problems in the prior art, the present invention provides a dust removal device for an electrostatic precipitator and a method of using it, which can thoroughly remove stubborn dust adhering to the dust collection plate.

[0008] The technical solution of the present invention is as follows:

[0009] A dust removal device for an electrostatic precipitator includes an electrostatic precipitator shell wall panel and a liquid nitrogen dust removal device. The liquid nitrogen dust removal device is fixedly installed on the electrostatic precipitator shell wall panel, with one end extending through the shell wall panel into the interior of the electrostatic precipitator. The liquid nitrogen dust removal device includes a launching tube and a liquid nitrogen spray pipe fixed to the bottom of the launching tube. One end of the launching tube is provided with a swirling air inlet, and the other end of the launching tube located inside the electrostatic precipitator has a launching port. A water inlet pipe is connected to the launching tube. The interior of the liquid nitrogen spray pipe is connected to the interior of the launching tube through a liquid nitrogen diversion pipe. The end of the liquid nitrogen spray pipe located inside the electrostatic precipitator is provided with a liquid nitrogen atomizing nozzle. Water droplets dripping from the water inlet pipe condense into ice beads as liquid nitrogen flows in through the liquid nitrogen diversion pipe and are sprayed out through the launching port to wet the anode plates inside the electrostatic precipitator.

[0010] The device also includes a rapping shaft, a rapping motor, and an air duct. The air duct is located inside the launching tube, with both ends of the air duct penetrating the launching tube. One end of the air duct is fixedly connected to the output end of the rapping motor, and the other end of the air duct is connected to the rapping shaft. The air duct has an air inlet and an air outlet arranged circumferentially. The air inlet is located inside the launching tube, and the air outlet is located inside the electrostatic precipitator. A heating system is installed inside the air duct to heat the gas entering the air duct.

[0011] The heating system includes a heating coil fixed inside the air duct and a power supply control box fixed on the emitting tube. The power supply control box supplies power to the heating coil and regulates the temperature.

[0012] The launch tube is equipped with a Venturi channel, and both the Venturi channel and the liquid nitrogen diversion pipe are located between the water inlet pipe and the vortex air inlet.

[0013] The emission port of the emission tube is tilted and positioned towards the top of the inside of the electrostatic precipitator.

[0014] The launch tube is equipped with a curved slide plate inside, with one end of the curved slide plate located at the bottom of the water inlet pipe and the other end of the curved slide plate located at the launch port.

[0015] The liquid nitrogen spray pipe is equipped with an electrically controlled valve.

[0016] The air inlet axis is perpendicular to the air duct axis, and the air outlet axis is oriented towards the outlet of the emission port.

[0017] A method of using a dust removal device for an electrostatic precipitator includes the following steps:

[0018] S1: After the electrostatic precipitator stops working, gas is delivered into the inside of the emission tube through the cyclone air inlet. After the gas is split, it passes through the air inlet and the Venturi channel.

[0019] S2: Close the electrically controlled valve inside the liquid nitrogen ejection pipe, and use the external liquid nitrogen injection device to spray liquid nitrogen into the liquid nitrogen ejection pipe. The liquid nitrogen flows into the inside of the launch tube through the liquid nitrogen diversion pipe.

[0020] S3: Turn on the power supply and wiring control box to heat the heating coil, so that the gas entering the air duct through the air inlet is heated, and hot air is continuously supplied to the emission port through the air outlet;

[0021] S4: Several water droplets are slowly dripped into the launch tube from the inlet pipe and fall onto the top of the curved slide plate. The water droplets are condensed into several ice beads by the sprayed liquid nitrogen and then propelled by the gas accelerated by the Venturi channel towards the launch port.

[0022] S5: After several ice beads are ejected from the nozzle, they are melted by hot air and adhere to the surface of the anode plate inside the electrostatic precipitator. Then, the water inlet pipe is stopped and the electrically controlled valve inside the liquid nitrogen spray pipe is opened. Liquid nitrogen is then introduced into the electrostatic precipitator through the nozzle and the liquid nitrogen atomizing nozzle, and it adheres to the surface of the anode plate until it freezes into ice with the water droplets on the surface of the anode plate.

[0023] S6: Start the rapping motor. The rapping motor drives the rapping hammer at the end of the rapping shaft to strike the rapping rod at the bottom of the anode plate, causing the anode plate to vibrate and thus causing the dust on the anode plate that has condensed into ice along with water droplets to fall off.

[0024] The present invention has the following beneficial effects:

[0025] This invention first wets the anode plate inside the electrostatic precipitator with water droplets, and then pours liquid nitrogen into the electrostatic precipitator so that the liquid nitrogen comes into contact with the water droplets attached to the anode plate. The water droplets will fuse with the dust and freeze into ice. Then, the rapping motor is started, and the rapping hammer on the rapping shaft is driven by the rapping motor to strike the anode plate, so that the dust that has frozen with the water on the anode plate is shaken off, thus achieving thorough dust removal. Attached Figure Description

[0026] Figure 1 This is a half-sectional view of the overall structure of the present invention.

[0027] The reference numerals in the figure are as follows:

[0028] 1. Vibrating shaft; 2. Vibrating motor; 3. Electrostatic precipitator housing wall panel; 4. Ejector tube; 5. Liquid nitrogen spray pipe; 6. Water inlet pipe; 7. Air duct; 41. Swirl air inlet; 42. Ejector port; 43. Power supply wiring control box; 44. Venturi channel; 45. Curved slide plate; 51. Liquid nitrogen distribution pipe; 52. Liquid nitrogen atomizing nozzle; 53. Electrically controlled valve; 71. Air inlet; 72. Air outlet; 73. Heating coil. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] Please see Figure 1 The invention provides a technical solution:

[0031] A dust removal device for an electrostatic precipitator includes an electrostatic precipitator shell wall panel 3 and a liquid nitrogen dust removal device. The liquid nitrogen dust removal device is fixedly installed on the electrostatic precipitator shell wall panel 3, with one end extending through the shell wall panel 3 into the interior of the electrostatic precipitator. The liquid nitrogen dust removal device includes a launching tube 4 and a liquid nitrogen spray pipe 5 fixed to the bottom of the launching tube 4. One end of the launching tube 4 is provided with a swirling air inlet 41 to form a swirling flow of the reacting gas. A Venturi channel 44 is provided inside the launching tube 4. The gas forming a swirling flow after passing through the swirling air inlet 41 passes through the Venturi channel 44 and is then sprayed towards the electrostatic precipitator in a high-speed expanding and swirling manner, forming a jet swirling gas. The launching tube 4 is located within the electrostatic precipitator shell wall panel 3. The other end of the dust collector is provided with an outlet 42. The outlet pipe 4 is connected to a water inlet pipe 6. The water droplets dripping into the water inlet pipe 6 will be driven by the jetting swirling gas and sprayed from the outlet 42 toward the inside of the electrostatic precipitator to wet the anode plate. However, since the liquid is difficult to move during the spraying process, the liquid nitrogen spray pipe 5 at the bottom of the outlet pipe 4 is provided with a liquid nitrogen diversion pipe 51. The liquid nitrogen diversion pipe 51 is connected to the inside of the outlet pipe 4. By spraying liquid nitrogen, the liquid nitrogen enters the liquid nitrogen diversion pipe 51 and comes into contact with the water droplets dripping into the water inlet pipe 6, thereby causing the water droplets to condense into ice beads. When several water droplets are condensed into ice beads, the jetting swirling gas can more easily drive the ice beads to be sprayed inward.

[0032] Meanwhile, the Venturi channel 44 and the liquid nitrogen diversion pipe 51 are both located between the water inlet pipe 6 and the swirling air inlet 41 to ensure that the liquid nitrogen entering the inside of the launch tube 4 can come into contact with the water droplets under the action of the jetting swirling gas.

[0033] The liquid nitrogen spray pipe 5 is equipped with a liquid nitrogen atomizing nozzle 52 at one end inside the electrostatic precipitator, and is also equipped with an electrically controlled valve 53. When liquid nitrogen needs to be sprayed into the interior of the launching tube 4 through the liquid nitrogen diversion pipe 51, the electrically controlled valve 53 inside the liquid nitrogen spray pipe 5 is closed.

[0034] Meanwhile, to ensure that the ice beads melt in time after being sprayed and that the water from the melted ice beads wets the anode plate, this device also includes a rapping shaft 1, a rapping motor 2, and an air duct 7. The air duct 7 is located inside the launching tube 4, with both ends of the air duct 7 penetrating the launching tube 4. One end of the air duct 7 is fixedly connected to the output end of the rapping motor 2, and the other end of the air duct 7 is connected to the rapping shaft 1. The air duct 7 is circumferentially provided with an air inlet 71 and an air outlet 72. The air inlet 71 is located inside the launching tube 4, and the air outlet 72 is located inside the electrostatic precipitator. A heating system is installed inside the air duct 7 to heat the gas entering the air duct 7.

[0035] Specifically, the swirling gas formed by the swirl inlet 41 enters the air duct 7 through the inlet hole 71 and moves towards the outlet hole 72. At the same time, the heating system is activated to heat the gas inside. The heated gas is then discharged through the outlet hole 72. Furthermore, the axis of the outlet hole 72 is set towards the outlet of the emission port 42. Therefore, the hot air emitted through the outlet hole 72 continuously blows towards the emission port 42, raising the temperature around the emission port 42 and also raising the temperature inside the electrostatic precipitator. Under the action of the hot air blowing and the temperature increase inside the electrostatic precipitator, and since the ice beads are formed by the condensation of water droplets, the ice beads are small in size and do not have the problem of being difficult to melt. This allows the ice beads to melt relatively quickly after being sprayed out of the emission port 42. As a preferred option, the emission port 42 of the emission tube 4 is inclined towards the top of the inside of the electrostatic precipitator, like a chimney, which can create an effect similar to a rainy day, making the anode plate inside the electrostatic precipitator wet.

[0036] The heating system includes a heating coil 73 fixedly installed inside the air duct 7, and a power supply control box 43 fixedly installed on the emitting tube 4. The power supply control box 43 supplies power to the heating coil 73 and regulates the temperature; any heating system can also be used.

[0037] The inside of the launch tube 4 is equipped with a curved slide plate 45. One end of the curved slide plate 45 is located at the bottom of the water inlet pipe 6, and the other end of the curved slide plate 45 is located at the launch port 42. The ice beads formed by water droplets fall on the surface of the curved slide plate 45, and the curved slide plate 45 can help the ice beads to be sprayed out of the launch port 42 better.

[0038] A method of using a dust removal device for an electrostatic precipitator includes the following steps:

[0039] S1: After the electrostatic precipitator stops working, air is delivered into the emitter tube 4 through the cyclone inlet 41. After the air is split, it passes through the air inlet 71 and the venturi channel 44.

[0040] S2: Close the electrically controlled valve 53 inside the liquid nitrogen injection pipe 5, and use the external liquid nitrogen injection device to spray liquid nitrogen into the liquid nitrogen injection pipe 5. The liquid nitrogen flows into the inside of the launch pipe 4 through the liquid nitrogen diversion pipe 51.

[0041] S3: Turn on the power supply control box 43 to heat the heating coil 73, so that the air entering the air duct 7 through the air inlet 71 is heated and hot air is continuously supplied to the emission port 42 through the air outlet 72;

[0042] S4: Several water droplets are slowly dripped into the launch tube 4 from the water inlet pipe 6 and fall on the top of the curved slide plate 45. The water droplets are condensed into several ice beads by the sprayed liquid nitrogen and then sprayed out towards the launch port 42 by the air accelerated by the Venturi channel 44.

[0043] S5: After several ice beads are ejected through the ejector port 42, they are melted by hot air and adhere to the surface of the anode plate inside the electrostatic precipitator. Then, the input of water inlet pipe 6 is stopped and the electric control valve 53 inside the liquid nitrogen spray pipe 5 is opened. Liquid nitrogen is input into the interior through the liquid nitrogen spray pipe 5. The liquid nitrogen is input into the electrostatic precipitator through the ejector port 42 and the liquid nitrogen atomizing nozzle 52 and adheres to the surface of the anode plate until it freezes into ice with the water droplets on the surface of the anode plate.

[0044] S6: Start the rapping motor 2. The rapping motor 2 drives the rapping hammer at the end of the rapping shaft 1 to strike the rapping rod at the bottom of the anode plate, causing the anode plate to vibrate, thereby causing the dust on the anode plate that has condensed into ice along with water droplets to fall off.

[0045] It is worth mentioning that this design can also achieve a sealing effect. When the electrostatic precipitator is working, the gas is input as described above and heated by the heating system. The heated hot air is then ejected through the air outlet 72. The ejected hot air is sprayed onto the dust collector shell wall panel 3 and forms an air curtain. Under the action of the air curtain, the air can be quickly dispersed and mixed to achieve the effect of preventing air leakage.

[0046] The working principle of the dust removal device for electrostatic precipitators described above is as follows:

[0047] When the dust collector is not in operation and requires thorough cleaning of the internal dust, liquid nitrogen is injected into the inlet of the liquid nitrogen spray pipe 5 through an external liquid nitrogen injection device. The liquid nitrogen is then sprayed into the upper launching pipe 4 through the liquid nitrogen distribution pipe 51. Simultaneously, water droplets are poured into the water inlet pipe 6, and air is drawn in through the vortex air inlet 41. The air from the vortex air inlet 41 is compressed and accelerated through the Venturi channel 44 and sprayed towards the launching port 42. The water droplets dripping from the water inlet pipe 6 immediately condense into ice beads upon contact with the liquid nitrogen. The ice columns, driven by the jetting vortex gas, are ejected towards the launching port 42. The shape of the launching port 42 is arbitrarily fitted to the launching shape, causing the ejected ice beads to spray into the dust collector in a fountain-like manner. At the same time, the heating coil 73 is activated, partially heating the interior of the dust collector. The air inlet 71 blows towards the heating coil 73, and after being heated by the heating coil 73, it is blown out through the air outlet 72. The air outlet is set at a certain angle towards the dust collector housing wall panel 3, so the heated air will be directed towards the ice bead emission port 42. The heated air accelerates the melting of the sprayed ice beads, so that the liquid from the melted ice beads can be sprayed out in a fountain-like manner and adhere to the anode plate. After a certain period of time, that is, after wetting the internal anode plate, the electrically controlled valve 53 inside the liquid nitrogen spray pipe 5 opens, the heating coil is closed, and liquid nitrogen is sprayed out from the liquid nitrogen atomizing nozzle 53 at the bottom, causing the water adhering to the anode plate to condense into ice and completely remove the dust. The rapping motor is started to drive the rapping shaft to vibrate and clean the dust.

[0048] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A dust removal device for an electrostatic precipitator, comprising an electrostatic precipitator shell wall panel (3), characterized in that: It also includes a liquid nitrogen dust removal device, which is fixedly installed on the wall panel (3) of the electrostatic precipitator shell. One end of the liquid nitrogen dust removal device extends into the interior of the electrostatic precipitator through the wall panel (3). The liquid nitrogen dust removal device includes a launching tube (4) and a liquid nitrogen spray pipe (5) fixed to the bottom of the launching tube (4). One end of the launching tube (4) is provided with a swirl inlet (41), and the other end of the launching tube (4) located inside the electrostatic precipitator is provided with a spray nozzle. The outlet (42) is connected to the water inlet pipe (6); the liquid nitrogen spray pipe (5) is connected to the inside of the outlet pipe (4) through a liquid nitrogen diversion pipe (51); the liquid nitrogen spray pipe (5) is located inside the electrostatic precipitator and has a liquid nitrogen atomizing nozzle (52) at one end; the water droplets dripping from the water inlet pipe (6) are condensed into ice beads by the liquid nitrogen flowing into the liquid nitrogen diversion pipe (51) and sprayed out through the outlet (42) to wet the anode plate inside the electrostatic precipitator.

2. The dust removal device for an electrostatic precipitator as described in claim 1, characterized in that: It also includes a rapping shaft (1), a rapping motor (2), and an air duct (7). The air duct (7) is located inside the launching tube (4). Both ends of the air duct (7) pass through the launching tube (4). One end of the air duct (7) is fixedly connected to the output end of the rapping motor (2), and the other end of the air duct (7) is connected to the rapping shaft (1). The air duct (7) is circumferentially provided with an air inlet (71) and an air outlet (72). The air inlet (71) is located inside the launching tube (4), and the air outlet (72) is located inside the electrostatic precipitator. The air duct (7) is provided with a heating system, which is used to heat the gas entering the air duct (7).

3. The dust removal device for an electrostatic precipitator as described in claim 2, characterized in that: The heating system includes a heating coil (73) fixedly installed inside the air duct (7) and a power supply control box (43) fixed on the emitting tube (4). The power supply control box (43) supplies power to the heating coil (73) and regulates the temperature.

4. The dust removal device for an electrostatic precipitator as described in claim 3, characterized in that: The launch tube (4) is provided with a venturi channel (44) inside. The venturi channel (44) and the liquid nitrogen diversion pipe (51) are both located between the water inlet pipe (6) and the vortex air inlet (41).

5. A dust removal device for an electrostatic precipitator as described in claim 4, characterized in that: The emission port (42) of the emission tube (4) is tilted towards the top of the inside of the electrostatic precipitator.

6. A dust removal device for an electrostatic precipitator as described in claim 5, characterized in that: The launch tube (4) is provided with a curved slide plate (45), one end of which is located at the bottom of the water inlet pipe (6), and the other end of which is located at the launch port (42).

7. A dust removal device for an electrostatic precipitator as described in claim 6, characterized in that: An electrically controlled valve (53) is installed inside the liquid nitrogen spray pipe (5).

8. A dust removal device for an electrostatic precipitator as described in claim 7, characterized in that: The axis of the air inlet (71) is perpendicular to the axis of the air duct (7), and the axis of the air outlet (72) is oriented toward the outlet of the emission port (42).

9. The method of using the dust removal device for an electrostatic precipitator as described in claim 8, characterized in that, Includes the following steps: S1: After the electrostatic precipitator stops working, gas is delivered into the emitter tube (4) through the cyclone inlet (41). After the gas is split, it passes through the inlet hole (71) and the Venturi channel (44). S2: Close the electrically controlled valve (53) inside the liquid nitrogen ejector pipe (5), and use the external liquid nitrogen injection device to spray liquid nitrogen into the liquid nitrogen ejector pipe (5). The liquid nitrogen flows into the inside of the launch tube (4) through the liquid nitrogen diversion pipe (51). S3: Turn on the power supply control box (43) to heat the heating coil (73), so that the gas entering the air duct (7) through the air inlet (71) is heated and hot air is continuously supplied to the emission port (42) through the air outlet (72); S4: Several water droplets are slowly dripped into the launch tube (4) from the water inlet pipe (6) and fall on the top of the curved slide plate (45). The water droplets are condensed into several ice beads by the sprayed liquid nitrogen and then sprayed out towards the launch port (42) by the gas accelerated by the Venturi channel (44). S5: After several ice beads are ejected through the ejector port (42), they are melted by hot air and adhered to the surface of the anode plate inside the electrostatic precipitator. Then, the input of the water inlet pipe (6) is stopped and the electric control valve (53) set inside the liquid nitrogen spray pipe (5) is opened. Liquid nitrogen is input into the interior through the liquid nitrogen spray pipe (5). The liquid nitrogen is input into the electrostatic precipitator through the ejector port (42) and the liquid nitrogen atomizing nozzle (52) and adheres to the surface of the anode plate until it freezes into ice with the water droplets on the surface of the anode plate. S6: Start the vibrating motor (2), and drive the vibrating hammer at the end of the vibrating shaft (1) to strike the vibrating rod at the bottom of the anode plate, so that the anode plate vibrates and the dust on the anode plate that has condensed into ice along with water droplets falls off.

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