A flue gas dust removal device

Abstract

The present invention relates to a flue gas dust removal device, which comprises a housing, an electric dust removal device and a bag dust removal device which are sequentially arranged in the housing, the housing is provided with an air inlet and an air outlet, the air inlet is connected with the electric dust removal device, and the air outlet is connected with the exhaust port of the bag dust removal device; the bag dust removal device comprises a plurality of filter bags and a magnet arranged in the filter bag, the magnet can form a first magnetic field in the filter bag, and the magnetic field direction of the first magnetic field is perpendicular to the height direction of the filter bag. The flue gas dust removal device can improve the dust removal effect of flue gas dust, reduce the situation that fine particle dust is discharged with flue gas, so that gas emission meets the requirements and avoids pollution.

Description

Technical Field

[0001] The invention relates to the technical field of dust removal equipment, and in particular to a flue gas dust removal equipment. Background Art

[0002] Before industrial flue gas is discharged into the atmosphere, it needs to be filtered by dust removal equipment to avoid environmental pollution. Take bag dust collector as an example. As a common dust collector, bag dust collector is widely used to remove dust particles in the gas. When the dust-containing gas enters the bag dust collector, the dust with large particles and high specific gravity will settle down due to gravity and fall into the ash hopper. When the gas containing fine dust passes through the filter material, the dust is retained, so that the gas is purified. However, it is inevitable that tiny dust particles will pass through the filter bag into the inner wall and be discharged into the atmosphere with the gas, causing pollution.

[0003] Therefore, how to improve the dust removal effect of flue gas and reduce the discharge of fine dust particles with flue gas so that gas emissions meet the requirements and avoid pollution is a technical problem that technicians in this field need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a flue gas dust removal device, which can improve the dust removal effect of flue gas dust, reduce the situation of fine particle dust being discharged with the flue gas, make the gas emission meet the requirements, and avoid pollution.

[0005] In order to solve the above technical problems, the present invention provides a flue gas dust removal equipment, which includes a shell and an electrostatic precipitator and a bag dust collector arranged in sequence in the shell, the shell is provided with an air inlet and an air outlet, the air inlet is connected to the electrostatic precipitator, and the air outlet is connected to the exhaust port of the bag dust collector; the bag dust collector includes a plurality of filter bags and a magnet arranged in the filter bag, the magnet can form a first magnetic field in the filter bag, and the magnetic field direction of the first magnetic field is perpendicular to the height direction of the filter bag.

[0006] When the flue gas passes through the electrostatic precipitator, the gas is ionized to produce anions and cations. The anions and cations are adsorbed on the dust, so that the dust acquires an electric charge. Under the action of the electric field force, the dust with different charge polarities moves to the electrodes with different polarities respectively and deposits on the electrodes, thereby achieving the effect of removing dust. When the flue gas after dust removal by the electrostatic precipitator enters the multiple filter bags of the bag-type dust collector, most of the dust particles have been blocked on the outer wall of the filter bag, and a small amount of fine dust particles enter the filter bag. Since the distance between the electrostatic precipitator and the bag-type dust collector is relatively close, this part of the dust entering the filter bag is still charged.

[0007] In the bag-type dust removal device, a magnet is provided in each filter bag, which can form a first magnetic field in the filter bag. The magnetic field direction of the first magnetic field is perpendicular to the height direction of the filter bag. After the flue gas enters the filter bag, its flow direction is also from bottom to top along the height direction of the filter bag. Therefore, the magnetic field direction of the first magnetic field is perpendicular to the flue gas flow direction. That is to say, some finer dust particles enter the first magnetic field after entering the filter bag, and these dust particles still carry electric charge. Therefore, the charged dust particles will be under the action of the first magnetic field force, so that the positively charged dust particles will be subjected to the magnetic field force away from the magnet, and move to the inner wall of the filter bag under the action of the magnetic field force, and the negatively charged dust particles will be subjected to the magnetic field force on one side of the magnet, and move to one side of the magnet under the action of the magnetic field force, so that the negatively charged dust particles entering the filter bag are adsorbed on the filter screens on both sides of the central magnet of the filter bag, further purifying the flue gas, reducing the situation of fine dust particles being discharged with the flue gas, improving the dust removal effect of the flue gas, and meeting the gas emission requirements.

[0008] Optionally, the outer wall of the magnet is also wrapped with a filter.

[0009] Optionally, the filter screen is fixed to the inner wall of the filter bag and encloses to form a mounting cavity for mounting the magnet.

[0010] Optionally, two ends of the magnet are respectively fitted and fixed to the inner wall of the filter bag.

[0011] Optionally, a ash discharge valve is provided at the bottom end of each filter bag.

[0012] Optionally, a cleaning component is provided at the top of the filter bag, and the cleaning component includes an air storage box and a blow pipe, and the blow pipe is provided with nozzles corresponding to each of the filter bags respectively, and the air storage box can spray compressed air into each of the filter bags through the blow pipe and the nozzle.

[0013] Optionally, it also includes an electromagnetic dust removal device, which includes a power supply, an electromagnetic group and a dust collecting plate. The electromagnetic group includes two oppositely arranged iron cores, and the outer walls of the iron cores are respectively wound with coils. The power supply can supply power to the coils and form a second magnetic field between the two iron cores. The magnetic field direction of the second magnetic field is perpendicular to the airflow direction. The plate surface of the dust collecting plate is respectively parallel to the airflow direction and the magnetic field direction of the second magnetic field. Some dust particles ionized by the electrostatic precipitator can be adsorbed on the dust collecting plate under the action of the magnetic field force of the second magnetic field.

[0014] Optionally, the electromagnetic dust removal device is integrated into the electrostatic dust removal device, which includes multiple rows of anode plates arranged in parallel and cathode wires arranged between two adjacent anode plates; the electromagnetic group is arranged between two adjacent anode plates, and the electromagnetic group can form the second magnetic field between two adjacent anode plates, and the anode plates form the dust collecting plates.

[0015] Optionally, the electromagnetic dust removal device further includes an adjustment component, which is capable of adjusting the power supply current of the power supply to the coil.

[0016] Optionally, the air inlet and the air outlet are respectively provided with a concentration monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a flue gas dust collector provided by an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A top view of

[0019] Figure 3 yes Figure 2 A magnified view of middle;

[0020] Figure 4 It is a schematic diagram of the internal structure of a bag dust removal device;

[0021] Figure 5 It is a cross-sectional view of the filter bag;

[0022] Figure 6 is the distribution diagram of the first magnetic field;

[0023] Figure 7 is the force diagram of the charge in the first magnetic field;

[0024] Figure 8 is the distribution diagram of charge under the action of the first magnetic field;

[0025] Fig. 9 It is a schematic diagram of the magnetic field of the electromagnetic group of the electromagnetic dust removal device;

[0026] Fig.10 It is a schematic diagram of the internal structure of an electrostatic precipitator integrated with an electromagnetic precipitator.

[0027] Attached Figure 1-10 In the figure, the reference numerals are described as follows:

[0028] 1-shell, 11-air inlet, 12-air outlet, 13-horn section;

[0029] 2-electric dust removal device, 21-anode plate, 22-cathode wire;

[0030] 3-bag dust removal device, 31-filter bag, 32-magnet, 33-first magnetic field, 34-filter screen, 35-ash discharge valve;

[0031] 4-cleaning parts, 41-air storage box, 42-blow pipe, 43-nozzle;

[0032] 5-electromagnetic dust removal device, 51-power supply, 52-conducting wire, 53-electromagnetic group, 531-iron core, 532-coil, 54-second magnetic field;

[0033] 6-Concentration monitoring device;

[0034] 7-Ash hopper. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] The embodiment of the present invention provides a flue gas dust collector, such as Figure 1 and Figure 2 As shown, the flue gas dust collector includes a shell 1 and an electrostatic precipitator 2 and a bag dust collector 3 which are arranged in sequence in the shell 1, wherein the shell 1 is provided with an air inlet 11 and an air outlet 12, the air inlet 11 is connected to the flue gas inlet of the electrostatic precipitator 2, and the air outlet 12 is connected to the exhaust port of the bag dust collector 3, that is, after the dust-containing flue gas enters the shell 1 through the air inlet 11, it is first dedusted by the electrostatic precipitator 2, and then dedusted by the bag dust collector 3, and finally discharged into the atmosphere through the air outlet 12.

[0037] When the flue gas passes through the electrostatic precipitator 2, the gas is ionized to produce anions and cations, which are adsorbed on the dust, so that the dust acquires an electric charge. Under the action of the electric field force, the dust with different charge polarities moves to electrodes with different polarities respectively and deposits on the electrodes, thereby achieving the effect of removing dust. When the flue gas after dust removal by the electrostatic precipitator 2 enters the multiple filter bags 31 of the bag-type dust collector 3, most of the dust particles have been blocked on the outer wall of the filter bag 31, and a small amount of fine dust particles enter the filter bag 31. Since the distance between the electrostatic precipitator 2 and the bag-type dust collector 3 is relatively close, this part of the dust entering the filter bag 31 is still charged.

[0038] In the bag-type dust removal device 3 of this embodiment, a magnet 32 ​​(such as Figure 5 As shown), the magnet 32 ​​can form a first magnetic field 33 in the filter bag 31, and the magnetic field direction of the first magnetic field 33 is perpendicular to the height direction of the filter bag 31 (as shown in FIG. Figure 6As shown in FIG. 3 , after the flue gas enters the filter bag 31, its flow direction is also from bottom to top along the height direction of the filter bag 31. Therefore, the magnetic field direction of the first magnetic field 33 is perpendicular to the flue gas flow direction. In other words, some fine dust particles enter the first magnetic field 33 after entering the filter bag 31, and these dust particles still carry electric charge. Therefore, Figure 7 As shown in the figure, the dust particles with the charge will be subjected to the magnetic field force away from the magnet 32 ​​under the action of the first magnetic field 33, and the dust particles with the positive charge will be subjected to the magnetic field force on the side away from the magnet 32, and will move to the inner wall of the filter bag 31 under the action of the magnetic field force, and the dust particles with the negative charge will be subjected to the magnetic field force on the side of the magnet 32, and will move to the side of the magnet 32 ​​under the action of the magnetic field force, so that the dust particles with the negative charge entering the filter bag 31 are adsorbed on the filter screens 34 on both sides of the central magnet 32 ​​of the filter bag (as shown in the figure). Figure 8 As shown), the flue gas can be further purified, the fine dust particles discharged with the flue gas can be reduced, the dust removal effect of the flue gas can be improved, and the gas emission requirements can be met.

[0039] The magnet 32 ​​is disposed in the filter bag 31. Figure 5 As shown, the N pole and S pole of the magnet 32 ​​are respectively oriented to the opposite sides of the filter bag 31, rather than being arranged up and down, as shown in FIG. Figure 6-8 It can be seen that on the same height section, arc-shaped magnetic flux lines are formed between the N pole and the S pole of the magnet 32. These magnetic flux lines are distributed on the section at this height. When the dust particles with charge pass through this height section, they can be affected as follows: Figure 7 The magnetic field force shown, and under the action of the magnetic field force, it moves to Figure 8 Position shown.

[0040] Further, such as Figure 6-8 As shown, the outer wall of the magnet 32 ​​is also wrapped with a filter 34. The negatively charged dust particles can be adsorbed on the filter 34 under the action of the electric field force. Compared with directly adsorbing on the side wall of the magnet 32, it is beneficial to the adsorption of particles and improves the dust removal effect.

[0041] like Figure 6-8 As shown, the filter screen 34 is fixed to the inner wall of the filter bag 31, that is, the filter screen 34 has two layers, and is enclosed in the filter bag 31 to form an installation cavity, and the magnet 32 ​​is located in the installation cavity, or the filter screen 34 can be directly fixed to the outer wall of the magnet 32 ​​by bonding or the like. When the magnet 32 ​​is placed in the installation cavity enclosed by the filter screen 34, the filter screen 34 can be easily cleaned.

[0042] like Figure 6-8As shown, the magnet 32 ​​is fixed to the inner wall of the filter bag 31, so that the magnet 32 ​​can provide support to the filter bag 31 on the inner wall of the filter bag 31, enhance the structural strength of the filter bag 31, and simplify the structure of the filter bag 31 while ensuring that the filter bag 31 has the same structural strength.

[0043] Specifically, there is no restriction on the specific material and fixing method of the filter bag 31 and the filter screen 34. For example, the material of the filter bag 31 and the filter screen 34 can be set to metal material, which is convenient for fixing and installing the ash discharge valve 35, can simplify the processing technology, and when the magnet 32 ​​is set in the installation cavity formed by the metal material, the weakening effect of the magnetic field force can be reduced, thereby ensuring the effect of the magnetic field force to improve the dust filtration efficiency.

[0044] like Figure 4 and Figure 5 As shown, the bottom of each filter bag 31 is also provided with an ash discharge valve 35. Since some fine dust particles will be adsorbed on the inner wall of the filter bag 31 and the outer wall of the filter screen 34 under the action of the magnetic field force, this part of the dust is located in the filter bag 31. When cleaning the filter bag 31, the ash discharge valve 35 can be opened to discharge the dust from the bottom of the filter bag 31. The setting of the ash discharge valve 35 facilitates the cleaning of the filter bag 31. Specifically, there is no restriction on the specific structure of the ash discharge valve 35. It mainly plays the role of a switch. When filtering the flue gas, the ash discharge valve 35 remains closed to prevent the dust-containing flue gas from entering the filter bag 31 from the bottom of the filter bag 31. When cleaning the filter bag 31, the ash discharge valve 35 can be opened to discharge the dust in the filter bag 31 from the bottom of the filter bag 31.

[0045] Further, such as Figure 1 and Figure 4 As shown, a cleaning component 4 is also provided at the top of the filter bag 31, and the cleaning component 4 is used to clean the filter bag 31. Specifically, the cleaning component 4 includes an air storage box 41 and a blow pipe 42. The blow pipe 42 is provided with a plurality of nozzles 43 corresponding to the top of each filter bag 31. The air storage box 41 can pass compressed air from the top into each filter bag 31 through the blow pipe 42 and the nozzle 43. The compressed air can impact the inner wall of the filter bag 31, so that the dust attached to the inner wall of the filter bag 31 and the surface of the filter screen 34 fall down and are discharged from the bottom of the filter bag 31. Part of the gas is discharged from the filter holes on the side wall of the filter bag 31 to clean the dust on the outer wall of the filter bag 31 so that it is separated from the outer wall of the filter bag 31. Finally, the dust outside the filter bag 31 and the dust inside the filter bag 31 fall into the ash hopper 7 located at the bottom of the housing 1. That is to say, in this embodiment, the cleaning operation of the filter bag 31 is the same as that of the traditional filter bag 31, and the applicability is good. Similarly, an ash hopper 7 is also provided below the electrostatic precipitator 2. When the electrostatic precipitator 2 needs to be cleaned, the dust adsorbed on the anode plate 21 can be made to fall into the ash hopper 7 by means of vibration or the like.

[0046] That is to say, since some tiny dust particles can easily pass through the filter bag 31 and affect the dust removal efficiency, the bag dust collector 3 provided in this embodiment, during the dust removal process for the flue gas, after the flue gas enters the filter bag 31, can be subjected to the action of the first magnetic field 33, so that the charged tiny dust particles that pass through the filter bag are adsorbed around the inner wall of the filter bag 31 and on the filter screen 34 for secondary filtration, thereby further improving the dust removal efficiency.

[0047] In the above embodiment, the flue gas dust collector also includes an electromagnetic dust removal device 5, which includes a power supply 51, an electromagnetic group 53 and a dust collecting plate, wherein the electromagnetic group 53 includes two oppositely arranged iron cores 531, and the outer walls of each iron core 531 are respectively wound with a coil 532, and the power supply 51 can supply power to the coil 532 through the wire 52, and form a second magnetic field 54 between the two iron cores 531, and the magnetic field direction of the second magnetic field 54 is perpendicular to the airflow direction, and the plate surface of the dust collecting plate is parallel to the airflow direction and the magnetic field direction of the second magnetic field 54, respectively. When the flue gas passes through the electrostatic precipitator 2, the dust is charged, and when the charged dust passes through the electromagnetic dust removal device 5, according to the left-hand rule, it will be affected by the Lorentz force and adsorbed on the plate surface of the dust collecting plate, thereby further removing dust from the flue gas, and then the flue gas enters the bag dust removal device 3 for further filtration and dust removal, thereby ensuring the cleanliness of the flue gas when it is discharged.

[0048] Specifically, Fig. 9 As shown, the outer wall of the iron core 531 is wound with a coil 532, and the current direction of the coil 532 is rightward as shown by the arrow in the figure. Therefore, the upper end of the electromagnetic group 53 forms an N pole and the lower end forms an S pole. Each electromagnetic group 53 is arranged at intervals in the height direction, so that a second magnetic field 54 is formed between the two electromagnetic groups 53. The direction of the second magnetic field 54 is from the N pole to the S pole, that is, from bottom to top. The airflow direction is perpendicular to the magnetic field direction of the second magnetic field 54, that is, it enters the electromagnetic dust removal device 5 from the side. When the charged dust passes through the second magnetic field 54, it can move to the left or right under the action of the magnetic field force of the second magnetic field 54 (specifically, the positively charged dust particles and the negatively charged dust particles move to the left and right sides respectively), and adsorbed on the dust collecting plate. Of course, the direction of the current in the coil 532 can also be different from that in FIG. Fig. 9 The direction shown is opposite, so that the upper end of the electromagnetic group 53 forms an S pole and the lower end forms an N pole. At this time, the direction of the second magnetic field 54 is from the N pole to the S pole, that is, from top to bottom. When the charged dust passes through the second magnetic field 54, it can move to the left or right under the action of the magnetic field force of the second magnetic field 54 and be adsorbed on the dust collecting plate.

[0049] like Figure 1As shown, in this embodiment, the electromagnetic dust removal device 5 is integrated in the electrostatic dust removal device 2. Specifically, the electrostatic dust removal device 2 includes a plurality of rows of anode plates 21 arranged in parallel and cathode lines 22 arranged between two adjacent anode plates 21. The electromagnetic group 53 is arranged between two adjacent anode plates 21, and the second magnetic field 54 is formed between the two adjacent anode plates 21. At the same time, the anode plate 21 forms the dust collecting plate. Alternatively, the electromagnetic dust removal device 5 can be separately provided from the electrostatic dust removal device 2. When the two are integrated into one, the overall structure can be simplified and the overall space can be reduced, which is convenient for realizing the miniaturization of the overall equipment.

[0050] The electromagnetic dust removal device 5 also includes an adjustment member, which can adjust the current supplied by the power supply 51 to the coil 532. The force F exerted on the charged dust when passing through the electrostatic dust removal device 2 (electromagnetic dust removal device 5) can be calculated according to the following formula:

[0051] F=qE+qvB=qE+qv(μ×H)=qE+qv(μ×N×I) / Le;

[0052] Among them, q is the charge of the dust particles, E is the electric field strength, v is the flow velocity of the dust particles, B is the magnetic induction intensity, μ is the magnetic permeability, H is the magnetic field strength, N is the number of turns of the coil 532, I is the current, and Le is the effective magnetic path length of the iron core 531.

[0053] In the above calculation formula, qE is the electric field force, qv(μ×N×I) / Le is the magnetic field force of the second magnetic field 54. When the current changes, the magnetic field force on the charged dust particles will change. Therefore, the adjustment member can adjust the current at any time according to the flue gas purification requirements of the flue gas dust collector to ensure the purification effect. At the same time, it can also achieve energy saving while meeting the emission requirements. Specifically, how to set the adjustment member and how to adjust the current of the power supply to the coil 532 through the adjustment member are already well-known prior art for those skilled in the art, and no specific restrictions are made here.

[0054] That is to say, in the flue gas dust removal device provided in this embodiment, a second magnetic field 54 is set in the electrostatic precipitator 2, so that the charged dust is affected by the electric field force and the magnetic field force of the second magnetic field 54 at the same time, resulting in electric coagulation and magnetic coagulation, which greatly enhances the coagulation effect of fine dust particles and effectively improves the dust removal efficiency. Specifically, it can be as follows Figure 3 As shown, the cathode line 22 passes through the electromagnetic group 53, or the size of the electromagnetic group 53 can be set smaller, and the electromagnetic groups 53 are arranged on both sides of the cathode line 22. In addition, in this embodiment, there is no restriction on the number of electromagnetic groups 53 between two adjacent anode plates 21. Figure 1As shown, multiple groups of electromagnetic groups 53 are formed between two adjacent anode plates 21, and a second magnetic field 54 (such as Fig. 9 and Fig.10 As shown), this can make the magnetic field force at each position uniform and improve the airflow distribution effect.

[0055] Specifically, Figure 1 As shown, concentration monitoring devices 6 are respectively provided at the air inlet 11 and the air outlet 12 of the shell 1 to monitor the dust content in the flue gas to be purified at the air inlet 11 and the dust content in the flue gas to be discharged at the air outlet 12. The current input by the power supply 51 to the coil 532 is adjusted in real time according to the monitoring results to ensure that the discharged flue gas meets the requirements.

[0056] That is to say, the electromagnetic dust removal device 5 can be opened and closed and adjusted according to specific circumstances. For example, when the dust concentration in the flue gas meets the standard, the electromagnetic dust removal device 5 can be turned off. When the dust concentration in the flue gas at the air outlet 12 is high, the electromagnetic dust removal device 5 can be turned on and the current passing through the coil 532 can be adjusted through the adjustment member. The electromagnetic dust removal device 5 can further remove dust from the flue gas before the flue gas enters the bag dust removal device 3 to reduce the dust removal pressure of the bag dust removal device 3.

[0057] There is no limitation in this embodiment for the magnet 32 ​​disposed in the filter bag 31. For example, it can be set as a permanent magnet 32 ​​or an electromagnet. When it is set as an electromagnet, the magnitude of its magnetic field force can also be adjusted by electric current.

[0058] In addition, if Figure 1 and Figure 2 As shown, the air inlet 11 of the housing 1 is further provided with a trumpet section 13, the cross-sectional area of ​​which gradually increases along the airflow direction to play a buffering role.

[0059] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A flue gas dust collector, characterized in that: The invention comprises a housing (1), and an electric dust removal device (2) and a bag dust removal device (3) which are sequentially arranged in the housing (1), wherein the housing (1) is provided with an air inlet (11) and an air outlet (12), wherein the air inlet (11) is connected to the electric dust removal device (2), and the air outlet (12) is connected to an exhaust port of the bag dust removal device (3); The bag dust removal device (3) comprises a plurality of filter bags (31) and a magnet (32) arranged in the filter bag (31); the magnet (32) can form a first magnetic field (33) in the filter bag (31); the magnetic field direction of the first magnetic field (33) is perpendicular to the height direction of the filter bag (31).

2. The flue gas dust collector according to claim 1, characterized in that: The outer wall of the magnet (32) is also wrapped with a filter screen (34).

3. The flue gas dust collector according to claim 2, characterized in that: The filter screen (34) is fixed to the inner wall of the filter bag (31) and encloses to form a mounting cavity for mounting the magnet (32).

4. The flue gas dust collector according to any one of claims 1 to 3, characterized in that: The two ends of the magnet (32) are respectively fitted and fixed to the inner wall of the filter bag (31).

5. The flue gas dust collector according to claim 4, characterized in that: The bottom end of each filter bag (31) is provided with an ash discharge valve (35).

6. The flue gas dust collector according to any one of claims 1 to 3, characterized in that: A cleaning component (4) is provided at the top end of the filter bag (31), and the cleaning component (4) comprises an air storage box (41) and a blow pipe (42), and the blow pipe (42) is provided with a nozzle (43) corresponding to each of the filter bags (31), and the air storage box (41) can inject compressed air into each of the filter bags (31) through the blow pipe (42) and the nozzle (43).

7. The flue gas dust collector according to any one of claims 1 to 3, characterized in that: The invention also comprises an electromagnetic dust removal device (5), the electromagnetic dust removal device (5) comprising a power source (51), an electromagnetic group (53) and a dust collecting plate, the electromagnetic group (53) comprising two iron cores (531) arranged opposite to each other, the outer walls of the iron cores (531) are respectively wound with coils (532), the power source (51) can supply power to the coils (532), and form a second magnetic field (54) between the two iron cores (531), the magnetic field direction of the second magnetic field (54) is perpendicular to the airflow direction, the plate surface of the dust collecting plate is respectively parallel to the airflow direction and the magnetic field direction of the second magnetic field (54), and part of the dust particles that are charged after being ionized by the electric dust removal device (2) can be adsorbed on the dust collecting plate under the action of the magnetic field force of the second magnetic field (54).

8. The flue gas dust collector according to claim 7, characterized in that: The electromagnetic dust removal device (5) is integrated into the electrostatic dust removal device (2), and the electrostatic dust removal device (2) comprises a plurality of rows of anode plates (21) arranged in parallel and a cathode line (22) arranged between two adjacent anode plates (21); The electromagnetic group (53) is provided between two adjacent anode plates (21), and the electromagnetic group (53) is capable of forming the second magnetic field (54) between the two adjacent anode plates (21), and the anode plates (21) form the dust collecting plates.

9. The flue gas dust collector according to claim 7, characterized in that: The electromagnetic dust removal device (5) further comprises an adjusting member capable of adjusting the power supply current of the power source (51) to the coil (532).

10. The flue gas dust collector according to claim 9, characterized in that: The air inlet (11) and the air outlet (12) are respectively provided with a concentration monitoring device (6).

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