A composite electrostatic cloth bag ultra-low emission dust collector for coking of a steel plant

Abstract

The utility model relates to the technical field of environmental protection dust removal equipment, specifically discloses a composite electrostatic cloth bag ultra-low emission dust collector for steel plant coking, which comprises: an air inlet box, which is a channel structure for connecting a steel plant coking exhaust pipeline and introducing dust-containing flue gas; a filter box is connected to the air inlet box; maintenance doors are installed on both sides of the filter box; and the air inlet box is the main dust removal site. The composite electrostatic cloth bag ultra-low emission dust collector for steel plant coking adopts a plate-type electrostatic dust removal structure and is matched with a thorn wire corona pole. Compared with the traditional corona pole, the thorn wire corona pole has stronger and more uniform discharge, can form a high-density charged area in an electric field, reduces the probability of reverse corona caused by an excessively strong local electric field, ensures the continuous and efficient capture of high specific resistance dust by the electrostatic dust removal cavity, stabilizes the dust removal rate in the electrostatic dust removal stage, and maintains a high level.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection dust removal equipment technology, specifically a composite electrostatic bag filter for ultra-low emission dust removal in steel plant coking. Background Technology

[0002] In the coking production process of steel plants, a large amount of coal dust is introduced into the atmosphere during the coal charging operation of the coke oven. During the coke pushing process, the hot coke comes into contact with the air and burns, producing high-temperature flue gas containing a large amount of dust, tar droplets and sulfur dioxide and other harmful pollutants. When the coke is quenched, the steam generated by the red coke coming into contact with water carries dust and other pollutants and is emitted together. If the pollutants are discharged directly into the atmosphere without effective treatment, they will cause great harm to the surrounding environment and the health of residents.

[0003] Traditional electrostatic precipitators are prone to back corona when handling high resistivity dust, leading to a significant decrease in dust removal efficiency. For ultrafine particles with a diameter of less than 1 micrometer, the capture effect of electrostatic precipitators is poor. Furthermore, in the use of baghouse dust collectors, the special components such as tar and water vapor contained in the coking flue gas of steel plants make it easy for tar to adhere to the surface of the filter bags and cause them to become clogged. Utility Model Content

[0004] The purpose of this utility model is to provide a composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking, in order to solve the problems mentioned in the background art, such as the back corona phenomenon that easily occurs when the electrostatic precipitator is used to deal with high resistivity dust, resulting in a significant decrease in dust collection efficiency, and the problem that tar easily adheres to the surface of the filter bag and causes the filter bag to become clogged during use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking, comprising an air inlet box, which is a channel structure for connecting the steel plant coking exhaust pipe and introducing dust-laden flue gas. A filter box is snapped into the air inlet box, and inspection doors are snapped into both sides of the filter box. The air inlet box is the main dust collection area.

[0006] The filter box is internally divided into an electrostatic dust removal chamber and a bag filter chamber connected front and back. The electrostatic dust removal chamber is equipped with a corrugated filter plate and an electrostatic precipitator, and the bottom of the electrostatic precipitator is connected to a dust collection hopper.

[0007] The filter box is equipped with a bag filter and a second corrugated filter plate, and the bottom of the bag filter is connected to the second dust collection hopper. The second dust collection hopper and the first dust collection hopper both penetrate the bottom of the air inlet box.

[0008] A composite filter frame is placed between the electrostatic precipitator and the bag filter, and the composite filter frame is arranged parallel to the first corrugated filter plate and the second corrugated filter plate.

[0009] By adopting the above technical solution, the dual-chamber classification of the electrostatic dust removal chamber and the bag dust removal chamber, the corrugated filter plate pre-blocks large particles to reduce electrostatic load and suppress back corona, and the composite filter frame uniformly combines with the bag fine filtration to reduce the direct adhesion of tar dust to the filter bag and alleviate bag clogging.

[0010] Preferably, the intake box has a tapered structure at both ends, and the inspection door on the outer wall of the intake box is flush with the outer wall.

[0011] By adopting the above technical solution, the gradually narrowing structure of the air intake box ensures a stable and uniform flow of flue gas, avoids dust diffusion caused by airflow impact, and reduces the risk of back corona caused by airflow turbulence in the electrostatic field.

[0012] Preferably, the electrostatic precipitator adopts a plate-type electrostatic precipitator structure and includes parallel and spaced dust collecting plates and corona electrodes, with the corona electrodes adopting a barbed wire structure.

[0013] Using the above technical solution, the plate electrostatic precipitator and the barbed wire corona electrode, the strong discharge of the barbed wire can quickly charge the high resistivity dust, avoiding back corona caused by uneven charging.

[0014] Preferably, the electrodes of the electrostatic precipitator are connected to the power controller, and the power controller passes through the air inlet box and the filter box.

[0015] Using the above technical solution, the power-on controller links the electrodes and adjusts the electric field parameters in real time. When encountering dust with high resistivity, it dynamically optimizes the electric field strength and suppresses the occurrence of back corona.

[0016] Preferably, the composite filter frame is a frame structure, and the filter bag mounting positions are arranged in an array inside the composite filter frame.

[0017] Using the above technical solution, the frame structure can be pre-laid with auxiliary filter material to intercept fine dust and tar droplets in advance, reduce the filtration pressure of the bag filter, and delay bag clogging.

[0018] Preferably, the bag filter has an opening at the bottom end near the composite filter frame and an opening at the top end near the corrugated filter plate.

[0019] The above technical solution, with its bottom-inlet and top-outlet design, allows the flue gas to pass through the filter bag for a longer path, increasing the contact time between dust, tar, and the filter bag, thus improving the interception effect.

[0020] Preferably, the bag filter bag of the dust collector is provided with a beater plate on one side, and the beater plate is connected to the output end of the push cylinder through the fish skeleton, and the push cylinder passes through the inspection door.

[0021] Using the above technical solution, periodic vibration can effectively remove the tar and dust mixture adhering to the surface of the filter bag, restore the air permeability of the filter bag, and solve the problems of traditional dust removal methods that easily damage the filter bag and cause the bag to become clogged due to incomplete dust removal.

[0022] Compared with the prior art, the beneficial effects of this utility model are: the composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking:

[0023] 1. The electrostatic precipitator of this dust collector adopts a plate-type electrostatic precipitator structure, equipped with barbed wire corona electrodes. Compared with traditional corona electrodes, barbed wires discharge more strongly and uniformly, forming a high-density charged area in the electric field. When dealing with high resistivity dust, the strong corona discharge can effectively suppress back corona phenomenon. In particular, the tip discharge characteristics of the barbed wires can make the dust quickly and fully charged, reducing the electric field distortion caused by insufficient dust charging. The uniform electric field distribution reduces the probability of back corona caused by excessive local electric field, ensuring the continuous and efficient capture of high resistivity dust in the electrostatic precipitator chamber, and keeping the dust removal rate of the electrostatic precipitator stage at a stable high level.

[0024] 2. Dust-laden flue gas first passes through a corrugated filter plate to initially intercept large dust particles, and then passes through an electrostatic precipitator to remove medium and small dust particles. This dual pre-dust removal can significantly reduce the dust concentration entering the bag filter chamber. At the same time, the composite filter frame evenly distributes the airflow and performs secondary filtration, further reducing the direct impact of dust on the bag filter bags. This reduces the dust load on the filter bags from the source and lowers the risk of tar and dust mixing and adhering to and clogging the filter bags. The bag filter is equipped with a dust removal structure consisting of a push cylinder, a beater plate, and a fish skeleton. Through the elastic linkage design of the fish skeleton, the beater plate can fit the surface of the pleated filter bag. During periodic vibration, the tar and dust mixture adhering to the filter bag can be effectively peeled off.

[0025] 3. The gradually narrowing structure of the air inlet box ensures a gradual and uniform flow of flue gas as it enters. Combined with the parallel arrangement of corrugated filter plate one, composite filter frame, and corrugated filter plate two, the flue gas is evenly distributed within the electrostatic precipitator and bag filter chambers, avoiding local airflow turbulence that could affect the dust removal effect. The graded synergy between electrostatic precipitator and bag filter achieves precise interception of pollutants such as dust and tar of different particle sizes. The inverted conical through-type structure of ash collection hopper one and ash collection hopper two ensures smooth dust discharge and reduces ash accumulation and blockage. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of this utility model;

[0027] Figure 2 This is a three-dimensional structural diagram of the filter box and composite filter frame of this utility model.

[0028] Figure 3This is a three-dimensional structural diagram of the air intake box and filter box of this utility model.

[0029] Figure 4 This is a three-dimensional structural diagram of the inspection door and composite filter installation of this utility model;

[0030] Figure 5 This is a three-dimensional structural diagram of the installation of the corrugated filter plate and the ash collection hopper of this utility model;

[0031] Figure 6 This is a three-dimensional structural diagram of the bag filter and corrugated filter plate of this utility model.

[0032] In the diagram: 1. Air inlet box; 2. Filter box; 3. Inspection door; 4. Corrugated filter plate one; 5. Electrostatic precipitator; 6. Dust hopper one; 7. Composite filter frame; 8. Bag filter; 9. Beating plate; 10. Push cylinder; 11. Dust hopper two; 12. Corrugated filter plate two; 13. Power controller. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figures 1-6 This utility model provides a technical solution: a composite electrostatic bag filter for coking in steel plants with ultra-low emission, including an air inlet box 1, a filter box 2, an inspection door 3, a corrugated filter plate 4, an electrostatic precipitator 5, a dust collection hopper 6, a composite filter frame 7, a bag filter 8, a beater 9, a push cylinder 10, a second dust collection hopper 11, a second corrugated filter plate 12, and a power controller 13;

[0035] Among them, the air intake box 1 is a channel structure that connects the coking exhaust pipe of the steel plant and introduces dust-laden flue gas. The air intake box 1 is fitted with a filter box 2, and the filter box 2 is fitted with maintenance doors 3 on both sides. The air intake box 1 is the main dust removal area.

[0036] The filter box 2 is internally divided into an electrostatic dust removal chamber and a bag filter chamber connected front and back. The electrostatic dust removal chamber is equipped with a corrugated filter plate 4 and an electrostatic precipitator 5. The bottom of the electrostatic precipitator 5 is connected to the dust collection hopper 6. A composite filter frame 7 is placed between the electrostatic precipitator 5 and the bag filter 8. The composite filter frame 7 is arranged parallel to the corrugated filter plate 4 and the corrugated filter plate 12. The composite filter frame 7 has a frame structure and the filter bag mounting positions are arranged in an array inside the composite filter frame 7. The electrostatic precipitator 5 adopts a plate electrostatic dust removal structure and includes parallel and spaced dust collection plates and corona electrodes. The corona electrodes adopt a barbed wire structure. The electrodes of the electrostatic precipitator 5 are connected to the power controller 13, and the power controller 13 passes through the air inlet box 1 and the filter box 2.

[0037] Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, the intake box 1 is connected to the exhaust pipe of the steel plant's coking process. The high-temperature, dust-laden flue gas generated by the steel plant's coking process enters the intake box 1 through the exhaust pipe. The intake box 1 has a tapered structure at both ends, which gradually slows down and evenly distributes the high-speed flue gas during its flow, effectively preventing dust from spreading and flying due to airflow turbulence. The intake box 1 and the filter box 2 are connected by a snap-fit ​​mechanism and secured with sealing strips and bolts to form a tight channel, ensuring that the flue gas enters the dust removal chamber of the filter box 2 smoothly without leakage. After the dust-laden flue gas enters the electrostatic dust removal chamber of the filter box 2, it first encounters the corrugated filter plate 4, which increases the contact area with the flue gas, acting more like a high-efficiency filter. Large dust particles are physically intercepted. At the same time, the corrugated structure cleverly guides the flue gas to flow evenly to the subsequent electrostatic precipitator 5, avoiding local airflow congestion that affects the dust removal effect. When the flue gas enters the electrostatic precipitator 5, the barbed wire corona electrodes in the plate structure are instantly ionized by the high voltage electric field applied by the power controller 13, causing the dust particles in the flue gas to be charged. Under the strong drive of the electric field, the charged dust particles quickly move towards the dust collecting plate and are firmly adsorbed. As the dust accumulates, it falls into the dust collection hopper 6 at the bottom under the action of gravity or with the assistance of the rapping device, efficiently completing the pre-separation of large and medium-sized dust particles and greatly reducing the burden on subsequent filtration.

[0038] The filter box 2 is equipped with a bag filter 8 and a corrugated filter plate 2 12. The bottom of the bag filter 8 is connected to the dust collection hopper 2 11. The dust collection hopper 2 11 and the connected dust collection hopper 1 6 both pass through the bottom of the air inlet box 1. The two ends of the air inlet box 1 are tapered structures. The inspection door 3 on the outer wall of the air inlet box 1 is flush with the bag filter 8. The bottom of the bag filter 8 near the composite filter frame 7 has an opening. The top of the bag filter 8 near the corrugated filter plate 2 12 has an opening. The bag filter 8 has a beater 9 on one side of the pleated filter bag. The beater 9 is connected to the output end of the push cylinder 10 through the fish skeleton. The push cylinder 10 passes through the inspection door 3.

[0039] Referring to the attached diagrams in the instruction manual Figures 1-6As shown, the flue gas after electrostatic precipitator still carries a small amount of escaped fine dust. This dust then enters the composite filter frame 7, which employs a frame structure with internally arranged filter bag mounting positions for secondary interception of residual dust. Its ingenious design, parallel to the corrugated filter plate 4 and corrugated filter plate 12, acts like a precise airflow regulator, ensuring uniform diffusion of the flue gas and a stable and evenly distributed airflow into the bag filter unit. This provides ideal conditions for fine filtration by the bag filter. After entering the bag filter 8, the uniform and stable airflow passes through the pleated structure of the filter bags, made of high-performance filter material. Through the dual action of surface filtration and deep interception, the filter bags act like a precise pollutant trap, capturing fine dust, tar droplets, and other pollutants. The purified flue gas then passes through the top opening of the bag filter 8 and undergoes secondary uniform flow through the corrugated filter plate 12. During continuous operation, dust and tar continuously adhere to the surface of the filter bags, affecting filtration efficiency. At this point, the driving cylinder 10 and the beater plate 9 work together to play a crucial role. When the cylinder 10 extends or retracts, the elastic linkage of the fish skeleton drives the beater 9 to periodically beat the filter bag with precise force and frequency. After the filter bag is vibrated, the dust and tar attached to the surface fall off instantly and fall into the ash collection hopper 2 11 at the bottom. The ash collection hopper 1 6 and the ash collection hopper 2 11 penetrate the bottom of the air inlet box 1. Through the external screw conveyor and other ash conveying equipment, the collected dust is discharged from the equipment at regular intervals. The whole process forms a complete dust removal closed loop, ensuring the continuous, efficient and stable operation of the dust collector and achieving the clean treatment of coking flue gas in steel plants.

[0040] Working Principle: When using this composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking, the dust-laden flue gas generated by the steel plant coking enters the inlet box 1 through the exhaust pipe. Its tapered structure ensures stable and uniform flow of high-speed flue gas. Subsequently, the flue gas smoothly enters the dust collection chamber inside the filter box 2 through the interlocking channels. The dust-laden flue gas enters the electrostatic dust collection chamber of the filter box 2, where large dust particles are first intercepted by the corrugated filter plate 4. Then, the flue gas enters the electrostatic precipitator 5. Under the action of the power controller 13, the barbed wire corona electrode charges the dust particles. The charged dust particles are adsorbed by the dust collecting plates and finally fall into the dust collection hopper 6 under gravity or vibration, completing the pre-separation of large and medium-sized dust particles. The flue gas after electrostatic dust collection enters the bag filter through the composite filter frame 7. After being evenly distributed, the airflow enters the bag filter 8 in the dust chamber. The pleated filter bags perform surface filtration and deep interception, capturing fine dust and tar droplets. The purified flue gas is discharged after passing through the top opening of the bag filter 8 and being uniformly distributed again through the corrugated filter plate 12. During operation, the cylinder 10 drives the beater plate 9 to periodically beat the filter bags through the fish skeleton, causing the dust and tar to fall into the ash collection hopper 11. The ash collection hopper 6 and the ash collection hopper 11 pass through the bottom of the air inlet box 1 and are connected to external ash conveying equipment such as screw conveyors to discharge the collected dust at regular intervals, completing the dust removal closed loop. Before the equipment is shut down, the flue gas inlet valve must be closed first, and the dust removal system must continue to run for a period of time to ensure that the inside of the equipment is clean before the power is turned off, which increases the overall practicality.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking, comprising: The air intake box (1) is a channel structure that connects the steel plant coking exhaust pipe and introduces dust-laden flue gas. The air intake box (1) is fitted with a filter box (2), and inspection doors (3) are fitted on both sides of the filter box (2). The air intake box (1) is the main dust removal site. The filter box (2) is characterized in that: the filter box (2) is divided into an electrostatic dust removal chamber and a bag dust removal chamber connected in front and behind, and the electrostatic dust removal chamber is provided with a corrugated filter plate (4) and an electrostatic dust collector (5), and the bottom of the electrostatic dust collector (5) is connected to a dust collection hopper (6). The filter box (2) is equipped with a bag filter (8) and a corrugated filter plate (12), and the bottom of the bag filter (8) is connected to the dust collection hopper (11). The dust collection hopper (11) and the dust collection hopper (6) are both connected to the bottom of the air inlet box (1). A composite filter frame (7) is placed between the electrostatic precipitator (5) and the bag filter (8), and the composite filter frame (7) is arranged parallel to the corrugated filter plate one (4) and the corrugated filter plate two (12).

2. The composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking as described in claim 1, characterized in that: The intake box (1) has a tapered structure at both ends, and the inspection door (3) on the outer wall of the intake box (1) is flush with it.

3. The composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking as described in claim 1, characterized in that: The electrostatic precipitator (5) adopts a plate-type electrostatic precipitator structure and includes parallel and spaced dust collection plates and corona electrodes. The corona electrodes adopt a barbed wire structure.

4. The composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking as described in claim 1, characterized in that: The electrodes of the electrostatic precipitator (5) are connected to the power controller (13), and the power controller (13) passes through the air inlet box (1) and the filter box (2).

5. A composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking, as described in claim 1, is characterized in that: The composite filter frame (7) is a frame structure, and the filter bag mounting positions are arranged in an array inside the composite filter frame (7).

6. The composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking as described in claim 1, characterized in that: The bag filter (8) has an opening at the bottom end near the composite filter frame (7), and the bag filter (8) has an opening at the top end near the corrugated filter plate (12).

7. A composite electrostatic bag filter for ultra-low emission dust collection in steel plant coking, as described in claim 1, is characterized in that: The bag filter (8) has a beater (9) on one side of the pleated filter bag, and the beater (9) is connected to the output end of the push cylinder (10) through the fish skeleton, and the push cylinder (10) passes through the inspection door (3).

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