Electric precipitation system and fly ash recovery method

Abstract

The invention belongs to the field of boiler dust removal, and relates to an electric dust removal system which comprises an electric dust removal unit, and the electric dust removal unit comprises a dust removal box, an anode plate, a cathode frame, an ash bucket and an induced draft fan; the anode plate and the cathode frame are mounted in the dust removal box, the dust hopper is mounted at the bottom of the dust removal box, and the water electrolysis unit is arranged in the dust removal box and mounted on the surface of the anode plate; the electrolyzed water unit comprises an electrolysis chamber, a cavity opening is formed in the outer wall of one side of the electrolysis chamber, the electrolysis chamber is fixedly connected to the surface of the anode plate, the cavity opening covers the surface of the anode plate, the outer wall of the electrolysis chamber is connected with a hydrogen pipeline and an oxygen pipeline, and a cathode plate is arranged in the electrolysis chamber. Or environmental pollution and resource waste are caused.

Description

Technical Field

[0001] The invention belongs to the field of boiler dust removal, relates to an electrostatic precipitator system, and also relates to a method for recovering fly ash by using the electrostatic precipitator system. Background Art

[0002] During coal-fired power generation, pulverized coal undergoes significant volume changes during combustion, including an initial expansion followed by a subsequent contraction. This process begins after the pulverized coal is ignited, when the decomposed volatiles begin to burn, causing the pulverized coal to expand in volume due to the escape of these volatiles. As combustion continues, the volume of the pulverized coal gradually decreases. After shrinking to a certain extent, the expanded particles enter the carbon-fixing combustion phase, where their particle size gradually decreases as they burn, ultimately forming fly ash. Meanwhile, some volatiles continue to expand during combustion, detaching from the combustion layer to form coarse ash. Fly ash and coarse ash together constitute fly ash, a significant waste product generated during the operation of thermal power plants.

[0003] Fly ash has a complex chemical composition, primarily consisting of oxides of elements such as Si, Fe, Al, Ca, Mg, and S, along with smaller amounts of metal oxides such as Na and K. Alumina and silica account for approximately 60% of the total fly ash composition. Given the staggering amount of fly ash generated during operation at thermal power plants, its proper handling and recycling is not only of environmental concern but also carries significant economic value.

[0004] Currently, traditional methods of treating fly ash mostly focus on harmless treatment or simple landfill, which not only fails to fully tap the resource potential of fly ash, but also may cause environmental pollution and waste of resources. Summary of the Invention

[0005] An object of the present invention is to provide an electrostatic precipitator system to solve the problem that traditional treatment fails to fully tap the resource potential in fly ash, or causes environmental pollution and waste of resources.

[0006] The first technical solution adopted by the present invention is an electrostatic precipitator system, comprising an electrostatic precipitator unit, which includes a dust removal box, an anode plate, a cathode frame, an ash hopper and an induced draft fan; the anode plate and the cathode frame are installed inside the dust removal box, the ash hopper is installed at the bottom of the dust removal box, and the electrolytic water unit is also included. The electrolytic water unit is provided inside the dust removal box and is installed on the surface of the anode plate;

[0007] The water electrolysis unit includes an electrolysis chamber, an outer wall of which is provided with a cavity, the electrolysis chamber is fixed to the surface of the anode plate and the cavity covers the surface of the anode plate, the outer wall of the electrolysis chamber is connected to a hydrogen pipeline and an oxygen pipeline, and a cathode plate is provided inside the electrolysis chamber;

[0008] The inlet end of the oxygen pipeline extends into the interior of the electrolysis chamber. The oxygen pipeline extending into the interior of the electrolysis chamber is a cathode pipeline. The cathode pipeline is vertically arranged inside the electrolysis chamber. The cathode plate is located inside the cathode tube. An installation groove is opened on the surface of the anode plate. The shape of the installation groove matches the cavity opening, and the cavity opening is inserted into the installation groove.

[0009] Preferably, an inspection ball valve is installed at the bottom of the ash hopper, an emergency ash discharge door is opened on the bottom outer wall of the ash hopper, and the ash hopper is connected to the induced draft fan through a pipeline.

[0010] Preferably, a reaction unit is further included, the reaction unit includes a reaction chamber, the fly ash collected by the ash hopper is sent into the reaction chamber, and the outlet end of the hydrogen pipeline is connected to the reaction chamber.

[0011] Preferably, the reaction unit further comprises a boiler air outlet pipe, and the boiler air outlet pipe passes through the interior of the reaction chamber.

[0012] Preferably, the outlet end of the oxygen pipeline is connected to the boiler.

[0013] Preferably, a mounting groove is provided on the surface of the anode plate, the shape of the mounting groove matches the cavity opening, the cavity opening is inserted into the mounting groove, the inner wall of the mounting groove is lined with a rubber pad, and the edge of the cavity opening presses against the rubber pad.

[0014] The second object of the present invention is to provide a fly ash recovery method, which also solves the problem that traditional treatment fails to fully tap the resource potential in fly ash, or causes environmental pollution and waste of resources.

[0015] Another technical solution adopted by the present invention is a fly ash recovery method using the above-mentioned electrostatic precipitator system, comprising the following steps:

[0016] Step 1: Use the dust removal box to absorb the fly ash of the boiler flue gas and collect it in the ash hopper. The dust collected in the ash hopper is transported to the reaction unit through the matching ash discharge device;

[0017] Step 2: The water electrolysis unit performs a water electrolysis reaction to generate hydrogen and oxygen, and the hydrogen is fed into the reaction unit;

[0018] Step 3: In the reaction unit, hydrogen undergoes a reduction reaction with oxides of silicon, iron, aluminum, calcium, and magnesium in the fly ash, replacing the corresponding elements.

[0019] Step 1 includes the following steps:

[0020] Step 1.1: Inside the dust removal box, the anode plate and cathode frame together form an electric field. When the dust-laden gas passes through, the dust particles are deposited on the anode plate under the action of the electric field force.

[0021] Step 1.2: The dust accumulated on the anode plate is shaken off into the ash hopper by periodically vibrating the anode plate;

[0022] Step 1.3: The dust collected by the ash hopper is transported and processed through the matching ash discharge device.

[0023] Step 2 includes the following steps:

[0024] Step 2.1: The electrolysis chamber is filled with pure water. When the power is turned on, the anode plate and the cathode plate electrolyze the water to generate hydrogen and oxygen.

[0025] Step 2.2: Hydrogen is sent out of the system through the hydrogen pipeline, and oxygen is exported through the oxygen pipeline to ensure that hydrogen and oxygen do not mix.

[0026] Step 3 includes the following steps:

[0027] Step 3.1: The fly ash collected in the ash hopper is sent to the reaction chamber of the reaction unit, and the hydrogen generated during the water electrolysis process enters the reaction chamber through the hydrogen pipeline;

[0028] Step 3.2: The boiler exhaust pipe transports the flue gas generated by the boiler combustion to exchange heat with the hydrogen, thereby providing the heat energy required for the reduction reaction;

[0029] Step 3.3: In the reaction chamber, hydrogen undergoes a reduction reaction with the oxides of silicon, iron, aluminum, calcium, and magnesium in the fly ash, replacing the corresponding elements.

[0030] The beneficial effects of the present invention are:

[0031] 1. The water electrolysis unit of the present invention works in coordination with the electrostatic precipitator unit, and the power supply and anode plate of the electrostatic precipitator system are used as the anode for electrolysis, thereby realizing efficient utilization of resources.

[0032] 2. The present invention installs an inspection ball valve and an emergency ash discharge door at the bottom of the ash hopper to solve the problem of ash accumulation and blockage in the ash hopper in the dust removal system of a thermal power plant, improves the accuracy and reliability of the ash hopper level meter, and thus ensures the safe and efficient operation of the dust removal system.

[0033] 3. The oxygen generated by electrolysis is directly used as a combustion aid in the boiler to improve the combustion efficiency of coal; hydrogen is used as a reducing agent to undergo a reduction reaction with fly ash in the reaction unit to achieve fly ash recycling.

[0034] 4. The mounting groove on the surface of the anode plate precisely matches the cavity of the electrolysis chamber, and the rubber pad achieves sealing and buffering effects. When the anode plate vibrates and shakes off the ash, the rubber pad prevents the fly ash from invading the electrolysis chamber through the tiny gap, protecting the pure water from pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 It is a schematic diagram of the principle of the present invention;

[0037] Figure 2 is a flow chart of the present invention;

[0038] Figure 3 It is a structural schematic diagram of the present invention;

[0039] Figure 4 This is an enlarged view of point A of the present invention;

[0040] Figure 5 A top view of the water electrolysis unit of the present invention;

[0041] Figure 6 Schematic diagram of the structure of the reaction unit of the present invention;

[0042] In the figure, 1. dust removal box, 2. anode plate, 3. cathode frame, 4. ash hopper, 5. inspection ball valve, 6. emergency ash discharge door, 7. water electrolysis unit, 71. electrolysis chamber, 72. hydrogen pipeline, 73. oxygen pipeline, 74. cathode pipeline, 75. cavity, 76. rubber pad, 77. cathode plate, 78. water inlet pipe, 8. reaction unit, 81. reaction chamber, 82. boiler air outlet pipe. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0044] The following is combined with Figure 1 To the attached Figure 6 And specific embodiments, the present invention is discussed in detail:

[0045] An electrostatic precipitator system, reference Figure 1 , including an electrostatic precipitator unit, which includes a dust box 1, anode plates 2, cathode frames 3, ash hopper 4 and induced draft fan. The anode plates 2 and cathode frames 3 are installed inside the dust box 1, and a number of anode plates 2 are vertically installed on the cathode frame 3. Figure 3 、 45. In the electrostatic precipitator system, an electrolytic water unit 7 and a reaction unit 8 are added. The electrolytic water unit 7 is designed based on the existing electrostatic precipitator unit, achieving a coordinated nested operation of the two. The electrolytic water unit 7 is provided inside the dust removal box 1 and is mounted on the surface of the anode plate 2.

[0046] Specifically, the water electrolysis unit 7 includes an electrolysis chamber 71, in which the water electrolysis reaction is carried out. A cavity 75 is provided on the entire outer wall of one side of the electrolysis chamber 71. The electrolysis chamber 71 is fixed to the surface of the anode plate 2 and the cavity 75 covers the surface of the anode plate 2. The electrolysis chamber is filled with pure water, which is in direct contact with the anode plate 2 through the cavity 75, ensuring the smooth progress of the electrolysis process.

[0047] The outer wall of electrolysis chamber 71 is connected to a hydrogen pipeline 72 and an oxygen pipeline 73. A cathode plate 77 is located inside electrolysis chamber 71. When anode plate 2 and cathode plate 77 are powered, they react to produce hydrogen and oxygen. The hydrogen is then safely and efficiently transported out of the system via hydrogen pipeline 72, while the oxygen is discharged via oxygen pipeline 73. Oxygen and hydrogen have their own uses.

[0048] To ensure that hydrogen and oxygen do not mix to form impure gases, the inlet end of oxygen conduit 73 is specifically extended into electrolysis chamber 71. This oxygen conduit 73 extends into electrolysis chamber 71 as a cathode conduit 74. Cathode conduit 74 is vertically positioned within electrolysis chamber 71, with cathode plate 77 located within cathode conduit 74. During the electrolysis process, oxygen bubbles emanating from the surface of cathode plate 77 are smoothly channeled along the vertical cathode conduit 74, without having the opportunity to escape into the water and mix with hydrogen. This design significantly improves gas purity and prevents the formation of mixed gases.

[0049] The ash hopper 4 is installed at the bottom of the dust removal box 1. An inspection ball valve 5 is installed at the bottom of the ash hopper 4. An emergency ash discharge door 6 is opened on the bottom outer wall of the ash hopper 4. The ash hopper 4 is connected to the induced draft fan through a pipeline.

[0050] After the dust from the anode plates 2 is shaken off and falls into the ash hopper 4, the accompanying ash discharge device removes the accumulated dust from the hopper 4. The inspection ball valve 5 assists inspection personnel in checking the dust accumulation in the hopper 4. The induced draft fan (IDF) is activated, creating negative pressure for the electrostatic precipitator system, which removes the accumulated dust from the hopper 4. Opening the inspection ball valve 5 also creates negative pressure in the hopper 4. If there is no negative pressure in the hopper 4, it indicates dust accumulation. The emergency ash discharge door 6 is then opened to clear the accumulated dust from the hopper 4 and prevent the ESP hopper from collapsing.

[0051] refer to Figure 3 、 45. In the electrostatic precipitator system, an electrolytic water unit 7 and a reaction unit 8 are added. The electrolytic water unit 7 is designed based on the existing electrostatic precipitator unit, achieving a coordinated nested operation of the two. The electrolytic water unit 7 is provided inside the dust removal box 1 and is mounted on the surface of the anode plate 2.

[0052] Specifically, the water electrolysis unit 7 includes an electrolysis chamber 71, in which the water electrolysis reaction is carried out. A cavity 75 is provided on the entire outer wall of one side of the electrolysis chamber 71. The electrolysis chamber 71 is fixed to the surface of the anode plate 2 and the cavity 75 covers the surface of the anode plate 2. The electrolysis chamber is filled with pure water, which is in direct contact with the anode plate 2 through the cavity 75, ensuring the smooth progress of the electrolysis process.

[0053] The outer wall of electrolysis chamber 71 is connected to a hydrogen pipeline 72 and an oxygen pipeline 73. A cathode plate 77 is located inside electrolysis chamber 71. When anode plate 2 and cathode plate 77 are powered, they react to produce hydrogen and oxygen. The hydrogen is then safely and efficiently transported out of the system via hydrogen pipeline 72, while the oxygen is discharged via oxygen pipeline 73. Oxygen and hydrogen have their own uses.

[0054] To ensure that hydrogen and oxygen do not mix to form impure gases, the inlet end of oxygen conduit 73 is specifically extended into electrolysis chamber 71. This oxygen conduit 73 extends into electrolysis chamber 71 as a cathode conduit 74. Cathode conduit 74 is vertically positioned within electrolysis chamber 71, with cathode plate 77 located within cathode conduit 74. During the electrolysis process, oxygen bubbles emanating from the surface of cathode plate 77 are smoothly channeled along the vertical cathode conduit 74, without having the opportunity to escape into the water and mix with hydrogen. This design significantly improves gas purity and prevents the formation of mixed gases.

[0055] The outer wall of the electrolysis chamber 71 is connected to a water inlet pipe 78, which is connected to a water source. When there is insufficient pure water in the electrolysis chamber, the water inlet pipe 78 replenishes pure water to ensure that the electrolysis reaction continues.

[0056] The outlet end of the oxygen pipe 73 is connected to the boiler, and the oxygen generated during the water electrolysis process is directly used as a combustion aid for the boiler, thereby achieving effective utilization of resources and significantly improving the combustion efficiency of coal in the boiler.

[0057] Hydrogen is used as a reducing agent for the rough processing of fly ash, and a reduction reaction is carried out in the reaction unit 8, referring to Figure 6 The reaction unit 8 includes a reaction chamber 81, which is connected to the ash hopper 4 through a pipeline. The pipeline sends the fly ash collected by the ash hopper 4 into the reaction chamber 81. The outlet end of the hydrogen pipeline 72 is connected to the reaction chamber 81. The hydrogen produced on the surface of the anode plate 2 enters the reaction chamber 81. The hydrogen reacts with the oxides of silicon, iron, aluminum, calcium, magnesium and ions contained in the fly ash to replace the elemental substances of iron, aluminum, calcium and magnesium.

[0058] The boiler's own air outlet pipe 82 penetrates the interior of the reaction chamber 81 and is responsible for transporting the flue gas generated by the boiler combustion. In the reaction chamber 81, the hydrogen and the flue gas undergo heat exchange, transferring the heat of the flue gas to the heat of the hydrogen, thereby effectively accelerating the process of the reduction reaction.

[0059] The surface of the anode plate 2 is provided with a mounting groove, the shape of which matches the cavity 75, ensuring that the cavity 75 can be firmly inserted into the mounting groove. In order to enhance the sealing and buffering effect, a layer of rubber pad 76 is specially laid on the inner wall of the mounting groove. When the edge of the cavity 75 fits tightly on this layer of rubber pad, an effective seal is formed. During the process of the anode plate 2 vibrating and shaking off dust, the rubber pad 76 not only plays a key sealing role, but also acts as a buffer layer, effectively preventing the tiny gaps that may be generated when the anode plate 2 vibrates, thereby preventing fly ash from invading the electrolysis chamber 71 through these potential gaps and protecting the pure water from pollution.

[0060] The working process of the electrostatic precipitator system provided by the present invention is as follows: the first step is electrostatic precipitator: inside the dust removal box 1, the anode plate 2 and the cathode frame 3 jointly form an electric field, so that when the dust-laden gas passes through, the dust particles are deposited on the anode plate 2 under the action of the electric field force. The accumulated dust is shaken off into the ash hopper 4 by regularly vibrating the anode plate 2. The dust collected in the ash hopper 4 is then transported and processed by a matching ash discharge device. In order to check the dust accumulation in the ash hopper 4, the dust accumulation status can be judged by opening and closing the check ball valve 5 to observe whether negative pressure is generated; if there is no negative pressure in the ash hopper 4, it means that there is too much dust accumulation. At this time, the emergency ash discharge door 6 needs to be opened for manual cleaning to prevent the ash hopper from collapsing.

[0061] The second step is electrolysis of water: the electrolysis water unit 7 is cleverly designed based on the electrostatic precipitator unit, in which the electrolysis chamber 71 is directly mounted on the surface of the anode plate 2 and is in direct contact with the anode plate 2 through the cavity 75. The electrolysis chamber 71 is always filled with pure water. Once the power is turned on, the anode plate 2 and the cathode plate 77 will start the water electrolysis reaction to generate hydrogen and oxygen. The generated hydrogen is safely sent out of the system through a special hydrogen pipeline 72, while the oxygen is exported through the oxygen pipeline 73. This design ensures that hydrogen and oxygen will not mix during the export process. At the same time, the water inlet pipe 78 is connected to the water source to continuously replenish the electrolysis chamber 71 with pure water, thereby ensuring the continuous and stable progress of the water electrolysis reaction.

[0062] The third step is fly ash reduction: Fly ash collected by the ash hopper 4 is fed into the reaction chamber 81 of the reaction unit 8. Simultaneously, hydrogen generated during the water electrolysis process is also introduced into the reaction chamber via the hydrogen pipeline 72. Inside the reaction chamber 81, the hydrogen undergoes a reduction reaction with the oxides of silicon, iron, aluminum, calcium, and magnesium in the fly ash, effectively replacing these elements. To accelerate this reduction reaction, the boiler's own air outlet pipe 82 penetrates the reaction chamber 81, delivering high-temperature flue gas, providing the necessary high-temperature environment for the reaction.

[0063] A fly ash recovery method, reference Figure 2 , using the above-mentioned electrostatic precipitator system, including the following steps:

[0064] Step 1: Use the dust removal box 1 to absorb the fly ash from the boiler flue gas and collect it in the ash hopper 4. The dust collected in the ash hopper is transported to the reaction unit 8 through the matching ash discharge device;

[0065] Step 2: The water electrolysis unit 7 performs a water electrolysis reaction to generate hydrogen and oxygen, and the hydrogen is fed into the reaction unit 8;

[0066] Step 3: In the reaction unit 8, hydrogen undergoes a reduction reaction with the oxides of silicon, iron, aluminum, calcium, and magnesium in the fly ash, replacing the corresponding elements.

[0067] Step 1 includes the following steps:

[0068] Step 1.1: Inside the dust removal box 1, the anode plate 2 and the cathode frame 3 form an electric field. When the dust-laden gas passes through, the dust particles are deposited on the anode plate 2 under the action of the electric field force.

[0069] Step 1.2: The dust accumulated on the anode plate 2 is shaken off into the ash hopper 4 by periodically vibrating the anode plate 2;

[0070] In step 1.3, the dust collected by the ash hopper 4 is transported and processed through the matching ash discharge device.

[0071] Step 2 includes the following steps:

[0072] Step 2.1: The electrolysis chamber 71 is filled with pure water. When the power is turned on, the anode plate 2 and the cathode plate 77 perform water electrolysis reaction to generate hydrogen and oxygen.

[0073] Step 2.2: Hydrogen is sent out of the system through the hydrogen pipeline 72, and oxygen is exported through the oxygen pipeline 73, ensuring that hydrogen and oxygen do not mix.

[0074] Step 3 includes the following steps:

[0075] Step 3.1: The fly ash collected in the ash hopper 4 is fed into the reaction chamber 81 of the reaction unit 8, and the hydrogen generated during the water electrolysis enters the reaction chamber 81 through the hydrogen pipeline 72;

[0076] Step 3.2: The boiler exhaust pipe transports the flue gas generated by the boiler combustion to exchange heat with the hydrogen, thereby providing the heat energy required for the reduction reaction;

[0077] Step 3.3: In the reaction chamber 81, hydrogen undergoes a reduction reaction with oxides of silicon, iron, aluminum, calcium, and magnesium in the fly ash, replacing the corresponding elements.

[0078] The fly ash recovery method provided by the present invention has the advantage that the electrolysis water and the fly ash reduction treatment device work together to achieve multifunctional integration of dust removal, electrolysis water to produce hydrogen and oxygen, and fly ash reduction treatment, which not only improves resource utilization efficiency, but also reduces environmental pollution, achieving the goals of green development and sustainable development.

[0079] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. An electrostatic precipitator system, characterized in that: It comprises an electrostatic precipitator unit, which comprises a dust removal box (1), an anode plate (2), a cathode frame (3), an ash hopper (4) and an induced draft fan; The anode plate (2) and the cathode frame (3) are installed inside the dust removal box (1), and the ash hopper (4) is installed at the bottom of the dust removal box (1). The invention is characterized in that it also includes an electrolytic water unit (7), and the electrolytic water unit (7) is provided inside the dust removal box (1). The electrolytic water unit (7) is installed on the surface of the anode plate (2); The water electrolysis unit (7) includes an electrolysis chamber (71), a cavity (75) is provided on an outer wall of one side of the electrolysis chamber (71), the electrolysis chamber (71) is fixed to the surface of the anode plate (2) and the cavity (75) covers the surface of the anode plate (2), the outer wall of the electrolysis chamber (71) is connected to a hydrogen pipeline (72) and an oxygen pipeline (73), and a cathode plate (77) is provided inside the electrolysis chamber (71); The inlet end of the oxygen pipe (73) extends into the interior of the electrolysis chamber (71). The oxygen pipe (73) extending into the interior of the electrolysis chamber (71) is a cathode pipe (74). The cathode pipe (74) is vertically arranged inside the electrolysis chamber (71), and the cathode plate (77) is located inside the cathode pipe (74).

2. The electrostatic precipitator system according to claim 1, characterized in that: An inspection ball valve (5) is installed at the bottom of the ash hopper (4), an emergency ash discharge door (6) is opened on the outer wall of the bottom of the ash hopper (4), and the ash hopper (4) is connected to the induced draft fan through a pipeline.

3. The electrostatic precipitator system according to claim 2, characterized in that: The invention also includes a reaction unit (8), wherein the reaction unit (8) includes a reaction chamber (81), the reaction chamber (81) is connected to the ash hopper (4) through a pipeline, and the pipeline sends the fly ash collected by the ash hopper (4) into the reaction chamber (81), and the outlet end of the hydrogen pipeline (72) is connected to the reaction chamber (81).

4. The electrostatic precipitator system according to any one of claims 1 to 3, characterized in that: The reaction unit (8) further includes a boiler air outlet pipe (82), wherein the boiler air outlet pipe (82) passes through the interior of the reaction chamber (81).

5. The electrostatic precipitator system according to any one of claims 1 to 3, characterized in that: The outlet end of the oxygen pipe (73) is connected to the boiler.

6. The electrostatic precipitator system according to any one of claims 1 to 3, characterized in that: A mounting groove is provided on the surface of the anode plate (2), the shape of the mounting groove matches the cavity opening (75), the cavity opening (75) is inserted into the mounting groove, the inner wall of the mounting groove is lined with a rubber pad (76), and the edge of the cavity opening (75) presses against the rubber pad (76).

7. A fly ash recovery method, characterized in that: Using the electrostatic precipitator system as claimed in claim 4, comprising the following steps: Step 1: Using the dust removal box (1) to absorb the fly ash from the boiler flue gas, the fly ash is collected in the ash hopper (4); the dust collected in the ash hopper (4) is transported to the reaction unit (8) through a matching ash discharge device; Step 2: The water electrolysis unit (7) performs a water electrolysis reaction to generate hydrogen and oxygen, and the hydrogen is fed into the reaction unit (8); Step 3: In the reaction unit (8), hydrogen undergoes a reduction reaction with oxides of silicon, iron, aluminum, calcium, and magnesium in the fly ash, replacing the corresponding elements.

8. The fly ash recovery method according to claim 7, characterized in that: The step 1 comprises the following steps: Step 1.1, inside the dust removal box (1), the anode plate (2) and the cathode frame (3) together form an electric field. When the dust-laden gas passes through, the dust particles are deposited on the anode plate (2) under the action of the electric field force; Step 1.2, the dust accumulated on the anode plate (2) is shaken off into the ash hopper (4) by periodically vibrating the anode plate (2); Step 1.3: The dust collected by the ash hopper (4) is transported and processed through the matching ash discharge device.

9. The fly ash recovery method according to claim 7, characterized in that: The step 2 comprises the following steps: Step 2.1: The electrolysis chamber (71) is filled with pure water. When the power is turned on, the anode plate (2) and the cathode plate (77) perform an electrolysis reaction on the water to generate hydrogen and oxygen. Step 2.2: Hydrogen is sent out of the system through the hydrogen pipeline (72), and oxygen is exported through the oxygen pipeline (73).

10. The fly ash recovery method according to claim 7, characterized in that: The step 3 comprises the following steps: Step 3.1: The fly ash collected by the ash hopper (4) is sent to the reaction chamber (81) of the reaction unit (8), and the hydrogen generated during the water electrolysis process enters the reaction chamber (81) through the hydrogen pipeline (72); Step 3.2, the boiler outlet pipe (82) transports the flue gas generated by the boiler combustion to exchange heat with the hydrogen, thereby providing the required heat energy for the reduction reaction; Step 3.3: In the reaction chamber (81), hydrogen undergoes a reduction reaction with oxides of silicon, iron, aluminum, calcium, and magnesium in the fly ash, replacing the corresponding elements.

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