Wet-type electric dust remover with novel structure

Abstract

The utility model discloses a wet-type electric dust remover with a novel structure, and belongs to the field of industrial tail gas treatment devices containing acid, alkali and particulate matter components. The wet-type electric dust remover comprises a box body, a conical pipe arranged in the box body, an air inlet formed in the conical pipe, an airflow uniform distribution plate arranged in the box body, a wet-type electric dust remover shell arranged on the box body and an air outlet formed in the wet-type electric dust remover shell. A flow dividing structure is arranged in the box body and comprises a grating plate arranged on the airflow uniform distribution plate and a filling material arranged on the grating plate in a filling mode. A plurality of spraying rods are arranged in the box body, and a plurality of nozzles are fixedly installed on the spraying rods. Acid, alkali and particulate matters in waste gas can be simultaneously removed in the same equipment, so that the tail gas treatment efficiency is improved; and meanwhile, flow field distribution in the wet-type electric dust remover is optimized through cooperation of the grating plate and the filler, impact of airflow is reduced, and the service life of the wet-type electric dust remover is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of industrial tail gas treatment devices containing acid, alkali and particulate components, and specifically to a wet electrostatic precipitator with a novel structure. Background Art

[0002] Industrial waste gas from many industries also contains pollutants such as dust (such as silicon dioxide), acidic and alkaline gases (hydrogen chloride, hydrogen fluoride, sulfur dioxide, nitrogen oxides), etc. These pollutants need to be removed to meet the corresponding atmospheric pollutant emission standards. Wet electrostatic precipitators have the advantages of high removal efficiency, corrosion resistance, and the ability to remove extremely fine dust. They are usually used for deep dust removal of waste gas. Packed scrubbers have a strong removal efficiency for acidic and alkaline gas pollutants, and the equipment is simple and reliable in operation. They are often used to absorb acidic gas pollutants in waste gas. In order to remove dust and acidic gas pollutants, they need to be used in series, which has significant disadvantages such as turbulent flow field, large floor space, and high investment.

[0003] like Figure 2 As shown, a conventional wet electrostatic precipitator includes a housing 1', a tapered tube 2' disposed inside the housing 1', an air inlet 21' provided on the tapered tube 2', an air flow uniformly distributing plate 3' disposed inside the housing 1' and connected to the tapered tube 2', a wet electrostatic precipitator housing 4' disposed on the housing 1', an air outlet 41' provided on an end of the wet electrostatic precipitator housing 4' away from the housing 1', and a water tank 5' disposed in the housing 1' for collecting liquid flowing out of the tapered tube 2'. When the gas to be treated enters the lower cavity of the wet electrostatic precipitator through the air inlet 21' on the lower side, eddy currents or strong turbulence often occur due to the uneven distribution of the airflow at the inlet section. The dust removal efficiency will inevitably be low in areas where the flow rate is too high, thereby reducing the overall dust removal efficiency of the wet electrostatic precipitator. At the same time, the continuous flushing of the airflow may cause the internal panels of the wet electrostatic precipitator to break or the fasteners to fall off, affecting the safe, stable and reliable operation of the wet electrostatic precipitator.

[0004] Therefore, the present application provides a wet electrostatic precipitator with a novel structure to solve the above problems. Utility Model Content

[0005] The present application provides a wet electrostatic precipitator with a novel structure, which aims to solve the problems raised in the background technology, such as the uneven distribution of airflow at the inlet section, which often leads to eddy currents or strong turbulence, and low dust removal efficiency in areas with excessively high flow rates, thereby reducing the overall dust removal efficiency of the wet electrostatic precipitator; at the same time, the continuous flushing of the airflow may cause the internal plates of the wet electrostatic precipitator to break or the fasteners to fall off, affecting the safe, stable and reliable operation of the wet electrostatic precipitator.

[0006] To achieve the above objectives, the present application provides the following technical solution: a wet electrostatic precipitator of a novel structure, comprising a housing, a conical tube disposed inside the housing, an air inlet provided on the conical tube, an air flow distribution plate disposed inside the housing and connected to the conical tube, a wet electrostatic precipitator housing disposed on the housing, and an air outlet provided on one end of the wet electrostatic precipitator housing away from the housing, wherein a water tank is provided inside the housing for collecting liquid flowing out of the conical tube;

[0007] The difference from the existing wet electrostatic precipitator is that: a diversion structure for changing the flow direction of the gas is provided in the box, and the diversion structure includes a grid plate provided on the airflow uniform distribution plate away from one end of the conical tube and a filler filled on the grid plate away from one end of the airflow uniform distribution plate; when in use, the exhaust gas first enters the interior of the conical tube through the air inlet, then rises along the airflow uniform distribution plate and hits the grid plate, and the filler on the grid plate offsets the impact force of the gas while changing the flow direction of the airflow. The present application utilizes a grid plate provided above the airflow uniform distribution plate and filler provided above the grid plate. During use, the grid plate disperses the flow rate of the gas, so that the airflow hits the filler at different flow rates, and the filler offsets the impact force of the gas while changing the flow direction of the airflow. The treated exhaust gas is discharged through the air outlet on the wet electrostatic precipitator housing, avoiding the phenomenon that the impact force of the airflow is too large and causes damage to the wet electrostatic precipitator housing.

[0008] Several spray rods are installed inside the housing, corresponding to the top of the filler, with several nozzles fixedly mounted on them. During operation, the spray rods and nozzles work together to spray the exhaust gas, removing acidic and alkaline pollutants from the exhaust gas through gas-liquid countercurrent mass transfer and neutralization reactions. The acidity and alkalinity of the spray liquid are adjusted based on the acidity and alkalinity of the pollutants in the exhaust gas. If the exhaust gas contains acidic pollutants, sodium hydroxide solution is used as the spray liquid; if the exhaust gas contains alkaline pollutants, sulfuric acid solution is used as the spray liquid.

[0009] Preferably, to enhance the grid plate's support for the filler, a support grid plate is fixedly mounted within the housing, between the airflow distribution plate and the grid plate, for supporting the grid plate. When the filler applies gravity to the grid plate, the support grid plate prevents deformation of the grid plate due to the gravity.

[0010] Preferably, in order to facilitate the positioning and installation of the support grid, a circular ring for supporting the support grid is fixedly connected to the interior of the box. The circular ring facilitates the positioning of the support grid inside the box, facilitates the positioning and installation of the support grid, and can also provide a certain degree of support for the support grid.

[0011] Preferably, the filler is polypropylene or ceramic (not the only filler), and its size and type vary according to the exhaust gas conditions.

[0012] Preferably, to facilitate the recycling of the liquid within the water tank, a water pump is provided on the water tank, the output end of the water pump being connected to the input end of the spray rod via a pipe. When the exhaust gas needs to be sprayed, the water pump can transport the liquid within the water tank to the interior of the spray rod, and then spray it out through the nozzle on the spray rod. Through gas-liquid countercurrent mass transfer, the acidic and alkaline pollutants in the exhaust gas are removed by neutralization reaction.

[0013] Preferably, to facilitate collection of liquid flowing out of the conical tube, the water tank has an opening at one end toward the conical tube, into which a drain pipe is inserted, communicating with the water tank and the conical tube. When liquid flows out of the conical tube, the drain pipe can direct the liquid into the water tank, thereby preventing splashing.

[0014] The present application utilizes a grid plate set above the air flow distribution plate and a filler set above the grid plate. During use, the grid plate disperses the flow rate of the gas, so that the air flow hits the filler at different flow rates. The filler offsets the impact force of the gas and changes the direction of the air flow. The treated exhaust gas is discharged through the air outlet on the wet electrostatic precipitator shell, avoiding the phenomenon that the impact force of the air flow is too large and causes damage to the wet electrostatic precipitator shell.

[0015] This application utilizes a spray rod and nozzle to spray waste gas, removing acidic and alkaline pollutants from the waste gas through countercurrent mass transfer between the gas and liquid phases and neutralization reactions. The acidity and alkalinity of the spray liquid are adjusted based on the acidity and alkalinity of the pollutants in the waste gas. For acidic pollutants, a sodium hydroxide solution is used; for alkaline pollutants, a sulfuric acid solution is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a new type of wet electrostatic precipitator;

[0017] Figure 2 Schematic diagram of the structure of a traditional wet electrostatic precipitator.

[0018] In the picture:

[0019] 1. Box body; 2. Conical tube; 21. Air inlet; 22. Drain pipe; 3. Air flow distribution plate; 4. Wet electrostatic precipitator housing; 41. Air outlet; 5. Water tank; 51. Water pump; 6. Diversion structure; 61. Grille plate; 611. Support grille; 6111. Ring; 62. Filler; 7. Spray rod; 71. Nozzle. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] Example 1

[0022] This embodiment provides a new type of wet electrostatic precipitator. Figure 1 As shown, the wet electrostatic precipitator includes a housing 1, a conical tube 2 disposed inside the housing 1, an air inlet 21 provided on the conical tube 2, an air flow uniform distribution plate 3 disposed inside the housing 1 and connected to the conical tube 2, a wet electrostatic precipitator housing 4 disposed on the housing 1, and an air outlet 41 provided on an end of the wet electrostatic precipitator housing 4 away from the housing 1. A water tank 5 is provided inside the housing 1 for collecting liquid flowing out of the conical tube 2.

[0023] What is different from the existing wet electrostatic precipitator is that a diversion structure 6 for changing the direction of gas flow is provided in the box body 1. The diversion structure 6 includes a grid plate 61 arranged on the air flow uniform distribution plate 3 away from the end of the conical tube 2 and a filler 62 filled on the grid plate 61 away from the end of the air flow uniform distribution plate 3; when in use, the exhaust gas first enters the interior of the conical tube 2 through the air inlet 21, then rises along the air flow uniform distribution plate 3, and hits the grid plate 61. The filler 62 on the grid plate 61 offsets the impact force of the gas and changes the direction of the air flow. The present application utilizes a grid plate 61 set above the air flow uniform distribution plate 3 and a filler 62 set above the grid plate 61. During use, the grid plate 61 disperses the flow rate of the gas, so that the air flow hits the filler 62 at different flow rates. The filler 62 offsets the impact force of the gas and changes the flow direction of the air flow. The treated exhaust gas is discharged through the air outlet 41 on the wet electrostatic precipitator housing 4, avoiding the phenomenon that the impact force of the air flow is too large and causes damage to the wet electrostatic precipitator housing 4.

[0024] Specifically, a support grid 611 is fixedly installed inside the housing 1 between the corresponding airflow distribution plate 3 and the grid plate 61 to support the grid plate 61. During use, the support grid 611 is first fixed inside the housing 1, and then the grid plate 61 is installed on the support grid 611. When the filler 62 applies gravity to the grid plate 61, the characteristics of the support grid 611 can prevent the grid plate 61 from deforming due to the gravity.

[0025] More specifically, a ring 6111 is fixedly connected to the interior of the box body 1 for supporting the support grid 611. The ring 6111 facilitates the positioning of the support grid 611 inside the box body 1, facilitates the positioning and installation of the support grid 611, and can also provide a certain support for the support grid 611.

[0026] Specifically, filler 62 is made of polypropylene or ceramic (not the only type of filler 62), and its size and type vary depending on the exhaust gas conditions. The height of filler 62 is designed with two key considerations: ensuring uniform airflow distribution and ensuring the removal efficiency meets emission standards for acidic pollutants of varying concentrations and types. The height of the filler layer is controlled between 1 and 3 meters.

[0027] Specifically, the water tank 5 has an opening at one end facing the tapered tube 2, into which a drain pipe 22 is inserted, communicating with both the water tank 5 and the tapered tube 2. During use, one end of the drain pipe 22 is first inserted into the water tank 5, and then the flange on the drain pipe 22 is bolted to the flange on the tapered tube 2. When liquid flows out of the tapered tube 2, it is directed into the water tank 5 through the drain pipe 22, preventing splashing.

[0028] It should be noted that the wet electrostatic precipitator housing 4, air flow distribution plate 3, support grid plate 611, grid plate 61, and drain pipe 22 are all made of glass fiber reinforced plastic (FRP). The material selection is based on the exhaust gas conditions to ensure excellent corrosion resistance.

[0029] Example 2

[0030] Different from Example 1, (during the process of flue gas electrostatic precipitator, there will be acidic or alkaline substances in the flue gas), for this reason, a number of spray rods 7 are further provided above the corresponding filler 62 inside the box body 1, and a number of nozzles 71 are fixedly mounted on the spray rods 7. When in use, the exhaust gas can be sprayed by the cooperation of the spray rods 7 and the nozzles 71, and the acidic and alkaline pollutants in the exhaust gas are removed by the gas-liquid countercurrent mass transfer and neutralization reaction. Among them, the acidity and alkalinity of the spray liquid are adjusted according to the acidity and alkalinity of the pollutants in the exhaust gas. If the exhaust gas contains acidic pollutants, the spray liquid is selected as sodium hydroxide solution for spraying; if the exhaust gas contains alkaline pollutants, the spray liquid is selected as sulfuric acid solution for spraying. The spray density range is 10m3 / m2 / h to 30m3 / m2 / h. Among them, the spray angle of the nozzle 71 can be selected from 60°, 90°, 120°, etc. The material of the nozzle 71 is not limited to 316L, 2205 stainless steel, C276 Hastelloy, polypropylene, polytetrafluoroethylene, ceramic, PP and other materials. The material is selected in combination with the exhaust gas conditions to ensure excellent corrosion resistance.

[0031] Furthermore, a water pump 51 is provided on the water tank 5 and is in communication with the water tank 5. The output end of the water pump 51 is in communication with the input end of the spray rod 7 via a pipe. During use, the input end of the water pump 51 is first connected to the water tank 5, and the output end of the water pump 51 is connected to the spray rod 7 via a pipe. When the exhaust gas needs to be sprayed, the water pump 51 can transport the liquid inside the water tank 5 to the inside of the spray rod 7, and then spray it out through the nozzle 71 on the spray rod 7. Through gas-liquid countercurrent mass transfer, the acidic and alkaline pollutants in the exhaust gas are removed by neutralization reaction.

[0032] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A wet electrostatic precipitator with a novel structure, comprising a housing (1), a conical tube (2) arranged inside the housing (1), an air inlet (21) provided on the conical tube (2), an air flow distribution plate (3) provided inside the housing (1) and connected to the conical tube (2), a wet electrostatic precipitator housing (4) provided on the housing (1), and an air outlet (41) provided on one end of the wet electrostatic precipitator housing (4) away from the housing (1), wherein a water tank (5) is provided inside the housing (1) for collecting liquid flowing out of the conical tube (2); Its characteristics are: A diversion structure (6) for changing the gas flow direction is provided in the box (1), and the diversion structure (6) comprises a grid plate (61) provided on the airflow distribution plate (3) at one end away from the conical tube (2), and a filler (62) filled on the grid plate (61) at one end away from the airflow distribution plate (3); A plurality of spray rods (7) are further provided inside the box (1) above the filler (62), and a plurality of nozzles (71) are fixedly mounted on the spray rods (7).

2. The novel wet electrostatic precipitator according to claim 1 is characterized in that: A support grid plate (611) for supporting the grid plate (61) is fixedly installed inside the box (1) between the airflow uniform distribution plate (3) and the grid plate (61).

3. The novel wet electrostatic precipitator according to claim 2 is characterized in that: A circular ring (6111) for supporting the supporting grid plate (611) is fixedly connected to the interior of the box body (1).

4. The novel wet electrostatic precipitator according to claim 1 is characterized in that: The filler (62) is polypropylene or ceramic.

5. The novel wet electrostatic precipitator according to claim 1 is characterized in that: The water tank (5) is provided with a water pump (51) in communication with the water tank (5), and the output end of the water pump (51) is in communication with the input end of the spray rod (7) via a pipeline.

6. The novel wet electrostatic precipitator according to claim 1 is characterized in that: The water tank (5) is provided with an opening at one end facing the tapered tube (2), and a drainage pipe (22) is inserted into the opening and is in communication with the water tank (5) and the tapered tube (2).

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