Main-electric auxiliary bag type composite dust collector

Abstract

The invention discloses a main-electric-auxiliary-bag type composite dust remover, relates to the technical field of dust removal, and can improve the trapping capability and the application range of an electric dust remover. According to the dust remover, an electric dust removal module comprises at least one electric trapping area, each electric trapping area is composed of a plurality of electric field channels, each electric field channel comprises two anode plate row sets and a cathode row set, each anode plate row set is composed of a plurality of anode plates, and each cathode row set is composed of a plurality of discharge wires and dust collection plates; each of a first plate surface and a second plate surface in the plate sheet structure of the anode plate is formed by sequentially arranging a plurality of arc-shaped plates, and an opening formed by the arc-shaped plates faces the interior of the plate sheet structure; the periphery of the plate sheet structure is composed of an upper sealing plate, a lower sealing plate, a front open groove and a rear clamping groove, and a dust collecting pipe is arranged at the position close to the rear clamping groove. Particulate matters in the flue gas are adsorbed to the plate structures under the action of airflow drag force and electric field force, and the particulate matters secondarily escaping from the plate structures enter the dust collecting pipes; and the bag dust removal module collects particulate matters from the dust collection pipe.

Description

Technical Field

[0001] The present application relates to the technical field of dust removal, and in particular to a main-electric-auxiliary-bag type composite dust collector. Background Art

[0002] Electrostatic precipitators have been widely used in thermal power, metallurgy, building materials, chemical industry and other industries due to their technical advantages such as small pressure drop, stable operation and strong adaptability. The main structure design of the electrostatic precipitator, flue gas conditions, dust characteristics and operation are important factors affecting the efficient and stable operation of the electric field of the electrostatic precipitator. Among them, the dust particle size and dust resistivity are the key to whether the dust can be effectively collected after entering the electric field.

[0003] The traditional electric bag composite dust collector has the electrostatic precipitator in front and the bag dust collector in the back. The electrostatic precipitator collects most of the dust, and the bag dust collector collects secondary escaped dust that is difficult for the electrostatic precipitator to capture. This results in a large number of electrostatic precipitator plates, a large area of ​​bag filter material, high investment, and high operating costs. Summary of the invention

[0004] The present application provides a main-electric and auxiliary-bag composite dust collector, which can, on the one hand, improve the electrostatic precipitator's ability to capture electric field positive particle dust, high resistivity dust and low resistivity dust, thereby expanding the scope of application of the electrostatic precipitator; on the other hand, it can collect and filter the dust before it escapes and spreads for the second time by utilizing a novel electrode surface structure and gas collection type. The amount of flue gas filtered by the bag-type dust collector is a small part of the amount of flue gas processed by the electrostatic precipitator, thereby reducing the amount of flue gas filtered by the bag-type dust collector, thereby reducing the equipment specification selection, and reducing the total equipment construction cost and equipment operating cost.

[0005] In order to achieve the above purpose, this application adopts the following technical solutions:

[0006] In a first aspect of the embodiments of the present application, a main-electric auxiliary-bag type composite dust collector is provided, the dust collector comprising: an electric dust removal module and a bag dust removal module;

[0007] The electrostatic precipitator module comprises at least one electrostatic collection zone, the electrostatic collection zone is composed of a plurality of electric field channels, one of the electric field channels comprises two rows of anode plate groups and one row of cathode groups, the anode plate group is composed of a plurality of independent anode plates;

[0008] The anode plate is a hollow plate structure, which is arranged in parallel with the flue gas flow direction, and includes a first plate surface and a second plate surface, wherein the first plate surface and the second plate surface are both composed of a plurality of arc-shaped plates arranged in sequence, and the opening direction formed by the arc-shaped plates of the first plate surface and the arc-shaped plates at corresponding positions of the second plate surface faces the inside of the plate structure, and the opening formed by the arc-shaped plates of the first plate surface and the opening formed by the arc-shaped plates of the second plate surface are staggered;

[0009] The plate structure is composed of an upper sealing plate, a lower sealing plate, a front slot and a rear slot. The upper sealing plate and the lower sealing plate are parallel to the flue gas flow direction. A dust collecting pipe is also provided between the front slot and the rear slot and adjacent to the rear slot.

[0010] The flue gas first enters the electrostatic precipitator module, and the particles in the flue gas enter and are adsorbed into the plate structure under the action of airflow drag and electric field force, and the particles that escape from the plate structure for a second time enter the dust collecting pipe;

[0011] The bag dust removal module is used to collect particulate matter from the dust collecting pipe.

[0012] In one embodiment, the bag dust removal module includes a pipeline system, a circulation fan, a control unit and a bag dust collector;

[0013] The dust collecting pipe is connected to the bag dust collector through the pipeline system, and the bag dust collector is also connected to the circulating fan;

[0014] The control unit is used to control the rotation speed of the circulating fan, the inlet and outlet flue gas pressures of the management system, and the flue gas pressure in the dust collecting pipe and the piping system, so that after the negative pressure state required by the design is formed in the dust collecting pipe and the piping system, the secondarily escaped particulate matter enters the dust collecting pipe and the piping system, and the particulate matter in the dust collecting pipe is collected by the bag dust collector.

[0015] In one embodiment, the pipeline system includes: a plurality of pneumatic joints, a plurality of branch pipelines, an electric regulating valve and a main pipeline;

[0016] One of the pneumatic joints is used to connect one of the dust collecting pipes and one of the branch pipes, each of the branch pipes is provided with an electric regulating valve, and each of the branch pipes converges to form the main pipe;

[0017] The main pipeline is connected to the bag filter and the circulating fan in sequence, and the control unit is connected to the circulating fan and the electric regulating valve respectively;

[0018] The control unit is specifically used to control the rotation speed of the circulating fan, the inlet and outlet flue gas pressures and the opening of the electric regulating valve, so that after a set negative pressure state is formed in the dust collecting pipe and the branch pipe, the particulate matter that escapes the plate structure for the second time enters the dust collecting pipe, and the bag dust collector is used to collect the particulate matter in the dust collecting pipe.

[0019] In one embodiment, it is characterized in that the front slot and the rear slot are both U-shaped structures, and the width of the rear slot is greater than the width of the front slot.

[0020] In one embodiment, the cathode array is composed of a plurality of cathode discharge wires and a cathode dust collecting plate;

[0021] The cathode wires include needle wires, barbed wires, sawtooth wires and spiral wires.

[0022] In one embodiment, the cathode dust collecting plate adopts an anode plate-like structure, and the anode plate-like structure is a structure in which the plate structure does not include the dust collecting pipe and the lower sealing plate has no through holes.

[0023] In one embodiment, the electrostatic precipitator module further includes a flue gas channel, and an air inlet and an air outlet are arranged on the flue gas channel. The cross-sectional area of ​​the air inlet is small at the front and large at the back, and the cross-sectional area of ​​the air outlet is large at the front and small at the back.

[0024] In one embodiment, the two adjacent anode plates in the same row of the electrostatic precipitator module are oriented in opposite directions, and the two adjacent anode plates in the same column are oriented in opposite directions;

[0025] The cathode wires and the cathode dust collecting plates are arranged alternately.

[0026] In one embodiment, the bag filter comprises: a cloth bag filter and a metal filter bag filter;

[0027] The bag filter material includes polyphenylene sulfide PPS, polyimide PI, polytetrafluoroethylene PTFE, stainless steel material, and intermetallic compounds.

[0028] The cloth bag forms include pleated filter bags and pleated filter cartridges.

[0029] In one embodiment, a plurality of rectangular holes are formed on the dust collecting pipe, and the area of ​​the rectangular holes is smaller as they are farther from the upper sealing plate, so as to ensure that the negative pressure at each rectangular hole is consistent.

[0030] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0031] The main-electric auxiliary bag type composite dust collector provided in the embodiment of the present application includes an electrostatic precipitator module and a bag dust removal module; wherein the electrostatic precipitator module includes at least one electric collection zone, the electric collection zone is composed of a plurality of electric field channels, one of the electric field channels includes two rows of anode plate groups and one row of cathode groups, the anode plate group is composed of a plurality of independent anode plates; the anode plate is a hollow plate structure, the plate structure is arranged parallel to the flue gas flow direction, the plate structure includes a first plate surface and a second plate surface, the first plate surface and the second plate surface are both composed of a plurality of arc plates arranged in sequence, the first plate surface The opening direction formed by the arc plate and the arc plate at the corresponding position of the second plate surface is toward the inside of the plate structure; the plate structure is composed of an upper sealing plate, a lower sealing plate, a front slot and a rear slot. The upper sealing plate and the lower sealing plate are parallel to the flue gas flow direction. A dust collecting pipe is also arranged between the front slot and the rear slot and adjacent to the rear slot; the flue gas first enters the electrostatic precipitator module, and the particulate matter in the flue gas enters and is adsorbed into the plate structure under the action of airflow drag and electric field force, and the particulate matter escaping from the plate structure for a second time enters the dust collecting pipe in the rear slot of the anode plate; a bag dust removal module is used to collect particulate matter from the dust collecting pipe. The main electric and auxiliary bag type composite dust collector provided in the embodiment of the present application has a plate structure of the anode plate that overcomes the problem that fine particles and high and low resistivity dust are difficult to be effectively captured after being charged in the electric field. The cathode dust collecting plate increases the cathode dust collecting area, and the positive particle dust in the electric field can be effectively captured. The bag dust collector collects particulate matter in the dust collecting pipe, which solves the problem of secondary dust caused by vibration cleaning and high and low resistivity dust characteristics, improves the overall dust removal efficiency, achieves ultra-low emissions of difficult-to-collect dust, and reduces the specification selection of the electrostatic precipitator. Before the secondary dust caused by vibration cleaning and high and low resistivity dust characteristics spreads, the new plate surface structure and gas collection type are used to collect and filter this part of the dust. The amount of flue gas filtered by the bag dust collector is a small part of the amount of flue gas processed by the electrostatic precipitator, which reduces the specification selection of the bag dust collector, thereby reducing the total equipment construction cost and equipment operation cost.

[0032] The main-electric and auxiliary-bag composite dust collector of the present application uses electric dust collection as the main part and bag dust collection as the auxiliary part, breaking the structural arrangement of traditional electric bag dust collector with electricity in front and bags in the back. The amount of flue gas processed by the bag dust collector is greatly reduced, and the construction cost and equipment operation cost are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A cross-sectional view of a main-electric auxiliary-bag composite dust collector provided in an embodiment of the present application from a top view;

[0034] Figure 2 A cross-sectional view of a main-electric auxiliary-bag composite dust collector provided in an embodiment of the present application from a left perspective;

[0035] Figure 3A schematic diagram of a dust particle capture area provided in an embodiment of the present application;

[0036] Figure 4 A structural diagram of an anode plate provided in an embodiment of the present application.

[0037] Reference numerals

[0038] 1 ~ flue gas channel; 2 ~ electric capture area; 3 ~ anode plate; 3-1 ~ upper sealing plate; 3-2 ~ lower sealing plate; 3-3 ~ arc plate; 3-4 ~ front slot; 3-5 ~ rear slot; 3-6 ~ dust collecting pipe; 3-7 ~ rectangular hole; 4 ~ cathode wire; 5 ~ cathode dust collecting plate; 6 ~ air inlet; 7 ~ air outlet; 8 ~ air flow distribution plate; 9 ~ pneumatic joint; 10 ~ branch line; 11 ~ main line; 12 ~ bag dust collector; 13 ~ circulating fan; 14 ~ control unit. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0041] Additionally, the use of “based on” or “according to” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” or “according to” one or more conditions or values ​​may, in practice, be based on additional conditions or beyond values.

[0042] Electrostatic precipitators have been widely used in thermal power, metallurgy, building materials, chemical industry and other industries due to their technical advantages such as small pressure drop, stable operation and strong adaptability. The main structure design of the electrostatic precipitator, flue gas conditions, dust characteristics and operation are important factors affecting the efficient and stable operation of the electric field of the electrostatic precipitator. Among them, the dust particle size and dust resistivity are the key to whether the dust can be effectively collected after entering the electric field.

[0043] Working principle of electrostatic precipitator: The cathode system is connected to a high voltage and a grounded anode plate to form a corona discharge. The ionized air generates negative ions that collide with the dust to charge. The charged dust is driven into the anode plate for dust collection under the action of the electric field force. When the external voltage of the electric field of the electrostatic precipitator continues to increase until the electric field discharge generates sparks, the negative corona undergoes electron collapse in the corona area to generate a large number of negative ions. A certain spark rate can ensure that there are enough negative ions in the electric field space to facilitate dust removal. The electric field discharge in the outer area of ​​the corona forms a high-conductivity mixed area of ​​positive and negative ions. A certain amount of positive ions are also generated in the electric field space. This part of the positive ions collides with the dust to form positive particles. The positive particle dust is driven into the cathode discharge electrode. Due to the limited surface area of ​​the cathode discharge electrode, a large number of positive particles escape, affecting the dust collection efficiency of the electrostatic precipitator.

[0044] The charging modes of dust entering the electric field are divided into electric field charging and diffusion charging. Existing studies have shown that dust particles with a diameter of more than 1um are mainly charged by electric field, dust particles with a diameter of less than 0.1um are mainly charged by diffusion, and dust particles with a diameter of 0.1 to 1um have both charging modes. This makes it difficult to charge fine particles with a diameter of ≤0.1um and the charging amount is small, which affects the dust collection efficiency of the electrostatic precipitator. Based on the adaptability of the electrostatic precipitator to dust, it is generally believed that the dust resistivity is 10 6 ~10 11 Dust within the Ω·cm range is more suitable for electrostatic precipitators. However, dust such as carbon black and high-temperature flue gas (≥350℃) has a low specific resistance. After the charged dust reaches the dust collecting electrode, it quickly releases the charge, detaches from the dust collecting electrode plate, returns to the airflow, and then recharges and captures in the electric field. This is repeated, jumping on the electrode plate, causing secondary dust, which affects the dust collection efficiency of the electrostatic precipitator.

[0045] After high resistivity dust enters the electric field, due to the poor conductivity of the particles, the charge is released slowly after reaching the dust collecting plate, resulting in dust accumulation on the surface of the dust collecting plate. When the electric field strength in the dust layer is greater than its critical value, local breakdown occurs between the pores of the dust layer, generating a back corona, and generating positive ions with opposite electrical properties to the corona electrode. The generated ions move toward the corona electrode and neutralize the negatively charged particles in the corona zone, resulting in increased current and reduced voltage, serious secondary dusting, and reduced dust removal efficiency. In order to improve the electrostatic precipitator's ability to capture positive particles in the electric field, improve the low collection efficiency of fine particulate matter caused by the action of electric field ion wind, and the secondary dust problem that is easily generated when the electrostatic precipitator collects high and low resistivity dust, and expand the scope of application of the electrostatic precipitator, the present application optimizes the electric field structure of the traditional electrostatic precipitator, and at the same time increases the bag dust collector to re-capture the secondary dust formed in the electric field, forming a main-electric and auxiliary-bag composite dust collector that can achieve ultra-low emissions of difficult-to-collect dust, achieving ultra-low emissions of difficult-to-collect dust, breaking the traditional electric bag dust collector's structural arrangement of electric power in front and bag behind, greatly reducing the amount of flue gas handled by the bag dust collector, and low construction costs.

[0046] like Figure 1-Figure 4 As shown, an embodiment of the present application provides a composite electrostatic precipitator, which includes: an electrostatic precipitator module and a bag dust collection module; the electrostatic precipitator module includes at least one electric collection zone 2, the electric collection zone is composed of a plurality of electric field channels, one of the electric field channels includes two rows of anode plate groups and one row of cathode groups, and the anode plate group is composed of a plurality of independent anode plates 3.

[0047] The anode plate 3 is a hollow plate structure, which is arranged in parallel with the direction of smoke flow, and includes a first plate surface and a second plate surface, each of which is composed of a plurality of arc-shaped plates 3-3 arranged in sequence, and the opening direction formed by the arc-shaped plates 3-3 of the first plate surface and the arc-shaped plates 3-3 at corresponding positions of the second plate surface is toward the interior of the plate structure; the plate structure is surrounded by an upper sealing plate 3-1, a lower sealing plate 3-2, a front slot 3-4 and a rear slot 3-5, and the upper sealing plate 3-1 and the lower sealing plate 3-2 are parallel to the direction of smoke flow, and a dust collecting pipe 3-6 is also arranged between the front slot 3-4 and the rear slot 3-5 and adjacent to the rear slot 3-5.

[0048] The flue gas first enters the electrostatic precipitator module, and the particulate matter in the flue gas enters and is adsorbed into the plate structure under the action of airflow drag and electric field force, and the particulate matter that escapes from the plate structure for a second time enters the dust collecting pipe 3-6; the bag dust removal module is used to collect particulate matter from the dust collecting pipe 3-6.

[0049] Optionally, the electrostatic precipitator module also includes a flue gas channel 1, the channel between the two rows of anode plates 3 is a flue gas channel 1, and the electric collection area 2 is composed of a plurality of flue gas channels 1; an air inlet 6 and an air outlet 7 are provided on the flue gas channel 1, and the cross-sectional areas of the air inlet 6 and the air outlet 7 are set according to the flue gas flow direction.

[0050] That is to say, the electrostatic precipitator module includes a flue gas channel 1 and an electrostatic collection area 2, and the electrostatic collection area 2 has at least two groups, each group of the electrostatic collection area 2 includes at least two rows of anode plate groups, and a plurality of anode plates 3 arranged parallel to the flue gas flow direction are provided in the same row of anode plate groups, and cathode wires 4 or cathode dust collecting plates 5 are provided between adjacent anode plates 3 in the same row of anode plate groups.

[0051] Optionally, the front slot 3-4 and the rear slot 3-5 are both U-shaped structures, and the width of the rear slot 3-5 is greater than the width of the front slot 3-4.

[0052] It can be understood that the anode plate 3 is a box-type plate structure, and the anode plate 3 includes an upper sealing plate 3-1, a lower sealing plate 3-2, two rows of arc plates 3-3 arranged in an interlaced manner along the flue gas flow direction, and a front slot 3-4 and a rear slot 3-5 located at the front and rear ends of the arc plate 3-3. The upper sealing plate 3-1, the lower sealing plate 3-2, the front slot 3-4 and the rear slot 3-5 are combined into the plate structure of the anode plate 3, and the arc plate 3-3 is fixed in the plate structure. The frame slot width of the rear slot 3-5 of the anode plate 3 is greater than the frame slot width of the front slot 3-4, which can facilitate the front-end escaped dust to enter the rear slot 3-5 for re-capture. The opening formed by the arc plate 3-3 on the first plate surface and the arc plate 3-3 at the corresponding position of the second plate surface is directed toward the interior of the plate structure, which is in line with the parabolic motion trend of the charged dust driven into the anode plate 3 under the action of the electric field force, so that the particulate matter in the flue gas can enter and be adsorbed into the plate structure under the action of the airflow drag and the electric field force.

[0053] In addition, the upper sealing plate 3-1 and the lower sealing plate 3-2 are firmly welded to the front slot 3-4 and the rear slot 3-5. A through hole is opened at the rear end of the lower sealing plate 3-2. A dust collecting pipe 3-6 that is the same length as the surface of the anode plate 3 is arranged in the rear slot 3-5. The lower end of the dust collecting pipe 3-6 is welded to the through hole, and the internal thread is formed by tapping or threading. The upper end of the dust collecting pipe 3-6 is sealed and welded to the upper sealing plate 3-1. The dust collecting pipe 3-6 has a plurality of rectangular holes 3-7 from top to bottom in the windward direction, and the area of ​​the rectangular hole 3-7 that is farther away from the upper sealing plate 3-1 is smaller, so as to ensure that the negative pressure at each rectangular hole is consistent.

[0054] Optionally, the cathode includes a cathode wire 4 and a cathode dust collecting plate 5; the cathode wire 4 includes a needle wire, a barbed wire and a spiral wire. The cathode dust collecting plate 5 adopts an anode plate-like structure, and the anode plate-like structure is a structure in which the plate structure does not include the dust collecting pipe 3-6 and the lower sealing plate 3-2 has no through hole.

[0055] That is to say, the cathode dust collecting plate 5 has a similar structure to the anode plate 3. Unlike the anode plate 3, the rear slot 3-5 of the cathode dust collecting plate 5 does not have a dust collecting pipe 3-6, and the lower sealing plate 3-2 of the cathode dust collecting plate 5 does not have a through hole.

[0056] The two adjacent anode plates 3 in the same row in the electrostatic precipitator module are oriented in opposite directions, and the two adjacent anode plates 3 in the same column are oriented in opposite directions; the cathode wires 4 and the cathode dust collecting plates 5 are arranged alternately. Specifically, one cathode wire 4 and a group of cathode dust collecting plates 5 are arranged alternately, or two cathode wires 4 and a group of cathode dust collecting plates 5 are arranged alternately.

[0057] Optionally, the bag dust removal module includes a pipeline system, a circulating fan 13, a control unit 14 and a bag dust collector 12;

[0058] The dust collecting pipes 3-6 are connected to the bag dust collector 12 through the pipeline system, and the bag dust collector 12 is also connected to the circulating fan 13; the control unit 14 is used to control the power of the circulating fan 13 and the air pressure in the pipeline system, so that after a negative pressure state is formed in the branch pipeline 10, the bag dust collector 12 is used to collect particulate matter in the dust collecting pipes 3-6.

[0059] Specifically, the pipeline system includes: a plurality of pneumatic joints 9, a plurality of branch pipelines 10, an electric regulating valve and a main pipeline 11;

[0060] A pneumatic joint 9 is used to connect a dust collecting pipe 3-6 and a branch pipe 10, and each branch pipe 10 is provided with an electric regulating valve, and each branch pipe 10 converges to form the main pipe 11; the main pipe 11 is connected to the bag dust collector 12 and the circulating fan 13 in sequence, and the control unit 14 is connected to the circulating fan 13 and the electric regulating valve respectively; the control unit 14 is specifically used to control the power of the circulating fan 13 and the electric regulating valve, so that after a negative pressure state is formed in the branch pipe 10, the bag dust collector 12 is used to collect the particulate matter in the dust collecting pipe 3-6.

[0061] Optionally, the bag filter 12 includes: a cloth bag filter 12 and a metal filter bag filter 12; the cloth bag filter material includes polyphenylene sulfide PPS, polyimide PI or polytetrafluoroethylene PTFE.

[0062] The control unit 14 may be a programmable logic controller (PLC), or other control devices or chips.

[0063] During the execution process, an electric regulating valve is arranged in the branch pipeline 10. After the electric regulating valve, each branch pipeline 10 converges to form the main pipeline 11, and the circulating fan 13 is started. The opening of the electric regulating valve and the power of the circulating fan 13 are controlled by PLC to adjust the negative pressure flow rate of the branch pipeline 10. A micro-negative pressure state is formed in the cavity at each opening of the dust collecting pipe 3-6 to prevent the dust that has been captured in the anode plate 3 from escaping to the electric field space again. The dust-containing flue gas entering the dust collecting pipe 3-6 enters the bag filter 12 again. After being efficiently filtered and captured by the bag filter 12, the clean flue gas enters the flue duct of the electrostatic precipitator outlet 7 with the circulating fan 13 and mixes with the clean flue gas of the electrostatic precipitator. In addition, the bag filter module, as a re-capture device for the escaped dust of the electrostatic precipitator, has a small amount of flue gas to be processed and occupies a small space, and can be arranged on the top or both sides of the electrostatic precipitator.

[0064] like Figure 1 and Figure 3 As shown, Figure 1 , Figure 3 The arrow in the figure indicates the direction of smoke flow. Figure 3The arc-shaped arrow line from the cathode to the anode plate 3 is the direction of the electric field, and the irregular line segment is the trajectory of particle movement. Figure 3 As shown, the dust-laden flue gas flows evenly into the electric field under the action of the airflow distribution plate 8, the cathode is coronaed under high voltage power supply conditions, negative ions are generated in the corona area, and the outer area of ​​the corona discharges to form a high-conductivity mixed area of ​​positive and negative ions. The particulate matter in the flue gas enters the electric field and collides with the positive and negative ions to be charged. Under the action of the electric field force, the positive particles and the negative particles make parabolic motions toward the cathode, the cathode dust collecting plate 5 and the anode plate 3, respectively. After low-resistance dust and high-resistance dust enter the electric field and are charged, they make parabolic motion under the action of the electric field force and are driven into the anode plate 3. After reaching the anode plate 3, they enter the space of the arc plate 3-3 of the box plate structure. Under the action of the electric field force and the vortex of the airflow, the charged dust is collected on the arc plate 3-3, the front slot 3-4 and the rear slot 3-5. Most of the dust accumulates in the rear slot 3-5. Under the action of the vibration force, the collected dust, low-resistance dust and high-resistance dust are easy to break away from the anode plate 3 and escape. At this time, the cavities at the several through holes of the dust collecting pipe 3-6 arranged in the rear slot 3-5 of the anode plate 3 from top to bottom form a local micro-negative pressure, and the escaping dust is sucked into the dust collecting pipe 3-6 and enters the bag dust collector 12 for further capture.

[0065] The charge of fine dust in the electric field is small, and it is driven into the anode plate 3 by the electric field ion wind. The arc plates 3-3 are arranged in an interlaced manner, which changes the double helix structure of the ion wind. The fine dust collides and deposits under the action of multiple vortices of the arc plates 3-3, which is conducive to the capture of fine dust. The anode plate 3 and the cathode dust collecting plate 5 have the same structure, but the width of the cathode dust collecting plate 5 along the flue gas flow direction is ≤ the width of the anode plate 3, so that a certain distance can be ensured between the cathode line 4 and the cathode dust collecting plate 5 to avoid high-voltage corona interference.

[0066] In summary, the main-electric auxiliary bag-type composite dust collector provided in the embodiment of the present application, the plate structure of the anode plate 3 overcomes the problem that fine particulate matter and high and low resistivity dust are difficult to be effectively captured after being charged in the electric field. The bag dust collector 12 collects particulate matter in the dust collecting pipe 3-6, and solves the secondary dust problem easily caused by vibration cleaning and high and low resistivity dust characteristics, thereby improving the overall dust removal efficiency and achieving ultra-low emissions of difficult-to-collect dust. In addition, the main-electric auxiliary bag-type composite dust collector of the present application uses electrostatic precipitator as the main and bag dust removal as the auxiliary, breaking the structural arrangement of the traditional electric bag dust collector 12 with electricity in front and bags in the back, and the amount of flue gas processed by the bag dust collector 12 is greatly reduced, and the construction cost is low. Furthermore, the cathode dust collecting plate 5 adopts the same box-type plate structure, and the dust collection area is significantly increased, which can effectively capture positive particles in the electric field and improve the scope of application of the electrostatic precipitator.

[0067] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A main-electric auxiliary-bag type composite dust collector, characterized in that: The dust collector comprises: an electric dust removal module and a bag dust removal module; The electrostatic precipitator module comprises at least one electrostatic collection zone, the electrostatic collection zone is composed of a plurality of electric field channels, one of the electric field channels comprises two rows of anode plate groups and one row of cathode groups, the anode plate group is composed of a plurality of independent anode plates; The anode plate is a hollow plate structure, which is arranged in parallel with the flue gas flow direction, and includes a first plate surface and a second plate surface, wherein the first plate surface and the second plate surface are both composed of a plurality of arc-shaped plates arranged in sequence, and the opening direction formed by the arc-shaped plates of the first plate surface and the arc-shaped plates at corresponding positions of the second plate surface faces the inside of the plate structure, and the opening formed by the arc-shaped plates of the first plate surface and the opening formed by the arc-shaped plates of the second plate surface are staggered; The plate structure is surrounded by an upper sealing plate, a lower sealing plate, a front slot and a rear slot. The upper sealing plate and the lower sealing plate are parallel to the flue gas flow direction, and a dust collecting pipe is also arranged near the rear slot. The flue gas first enters the electrostatic precipitator module, and the particles in the flue gas enter and are adsorbed into the plate structure under the action of airflow drag and electric field force, and the particles that escape from the plate structure for a second time enter the dust collecting pipe; The bag dust removal module is used to collect particulate matter from the dust collecting pipe.

2. The dust collector according to claim 1, characterized in that: The bag dust removal module includes a pipeline system, a circulating fan, a control unit and a bag dust collector; The dust collecting pipe is connected to the bag dust collector through the pipeline system, and the bag dust collector is also connected to the circulating fan; The control unit is used to control the rotation speed of the circulating fan, the inlet and outlet flue gas pressures of the pipeline system, and the flue gas pressure in the dust collecting pipe and the pipeline system, so that after the negative pressure state required by the design is formed in the dust collecting pipe and the pipeline system, the secondarily escaped particulate matter enters the dust collecting pipe and the pipeline system, and the particulate matter in the dust collecting pipe is collected by the bag dust collector.

3. The dust collector according to claim 2, characterized in that: The pipeline system includes: a plurality of pneumatic joints, a plurality of branch pipelines, an electric regulating valve and a main pipeline; One of the pneumatic joints is used to connect one of the dust collecting pipes and one of the branch pipes, each of the branch pipes is provided with an electric regulating valve, and each of the branch pipes converges to form the main pipe; The main pipeline is connected to the bag dust collector and the circulating fan in sequence, and the control unit is connected to the circulating fan, the bag dust collector and the electric regulating valve respectively; The control unit is specifically used to control the rotation speed of the circulating fan, the inlet and outlet flue gas pressures and the opening of the electric regulating valve, so that after a set negative pressure state is formed in the dust collecting pipe and the branch pipe, the particulate matter that escapes the plate structure for the second time enters the dust collecting pipe, and the bag dust collector is used to collect the particulate matter in the dust collecting pipe.

4. The dust collector according to claim 1, characterized in that: The front slot and the rear slot are both U-shaped structures, and the width of the rear slot is greater than the width of the front slot.

5. The dust collector according to claim 1, characterized in that: The cathode row group is composed of a plurality of cathode discharge wires and cathode dust collecting plates; The cathode wires include needle wires, barbed wires, sawtooth wires and spiral wires.

6. The dust collector according to claim 5, characterized in that: The cathode dust collecting plate adopts an anode plate-like structure, and the anode plate-like structure is a structure in which the plate structure does not include the dust collecting pipe and the lower sealing plate has no through holes.

7. The dust collector according to claim 1, characterized in that: The electrostatic precipitator module also includes a flue gas channel; The smoke passage is provided with an air inlet and an air outlet, wherein the cross-sectional area of ​​the air inlet is small at the front and large at the back, and the cross-sectional area of ​​the air outlet is large at the front and small at the back.

8. The dust collector according to claim 5, characterized in that: The two adjacent anode plates in the same row of the electrostatic precipitator module are oriented in opposite directions, and the two adjacent anode plates in the same column are oriented in opposite directions; The cathode wires and the cathode dust collecting plates are arranged alternately.

9. The dust collector according to claim 2, characterized in that: The bag dust collector includes: a cloth bag dust collector and a metal filter bag dust collector; The bag filter material includes polyphenylene sulfide PPS, polyimide PI or polytetrafluoroethylene PTFE, stainless steel material, and intermetallic compound; The cloth bag forms include pleated filter bags and pleated filter cartridges.

10. The dust collector according to claim 1, characterized in that: The dust collecting pipe is provided with a plurality of rectangular holes, and the area of ​​the rectangular holes is smaller as they are farther from the upper sealing plate.

Images