Dust waste gas treatment method

Abstract

The invention relates to the technical field of industrial emission treatment, in particular to a dust waste gas treatment method. According to the invention, a wet electrostatic precipitation (WESP) deep pretreatment heat energy cascade recycling humidifying hydrophobic zeolite rotating wheel concentration heat storage type oxidation cooperative treatment chain is constructed. Submicron particles and aerosol are efficiently removed under a high-voltage electric field through the WESP unit, and the risk of physical blockage to the rotating wheel is eliminated; afterheat of high-temperature purified flue gas generated by a heat accumulating type oxidation system is utilized, the temperature of saturated wet flue gas at an outlet of the WESP is increased by 5-15 DEG C through gas-gas heat exchange, the relative humidity is reduced to 60% or below, and an environment suitable for zeolite adsorption is created; and the concentrated organic oxide is oxidized and decomposed in the heat accumulating type oxidizing furnace to release heat energy, so that the heat balance of the system is maintained. According to the method, the comprehensive operation energy consumption of the system is remarkably reduced while dual up-to-standard emission of the particulate matters and the organic oxides is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of industrial emission control technology, specifically a method for treating dusty exhaust gas. Background Technology

[0002] With the advancement of global industrialization and the tightening of environmental standards, single waste gas treatment technologies can no longer meet the complex emission control needs of modern industry. Industrial waste gases are often not single components, but complex fluids mixed with particulate matter, moisture, acid and alkali droplets, and volatile organic compounds. For such waste gases, existing conventional treatment technologies face serious incompatibility issues and energy consumption bottlenecks in practical applications.

[0003] When treating dust-laden exhaust gas, the main technical approaches are divided into two categories: dry and wet methods. Dry filtration (bag filter / cartridge filter): Although bag filters are highly efficient at removing dry dust, the filter bags are prone to clogging when handling exhaust gases containing oil mist, sticky particles, or high humidity. Sticky substances can clog the pores of the filter media, causing a sharp increase in equipment resistance, failure of the dust removal system, and even safety accidents.

[0004] Wet scrubbing (spray tower / Venturi scrubber): Wet dust removal technology can effectively handle high-temperature, high-humidity, flammable, explosive, and sticky dust, and can also remove acidic gases by adding alkaline solutions. However, traditional spray towers, which rely on the inertial collision principle of droplets and particles, have extremely low removal efficiency for fine particles and aerosols with a diameter of less than 1 mm, easily resulting in blue or white smoke trails. Furthermore, the exhaust gas after wet treatment is inevitably saturated with water vapor, which poses a significant obstacle to subsequent treatment of organic compounds.

[0005] For organic compound waste gas, the most commonly used technology is adsorption concentration + combustion technology, among which zeolite rotary concentrator + regenerative oxidizer is the most common.

[0006] Although zeolite molecular sieves undergo hydrophobic modification, they are essentially still porous adsorption materials. Water molecules are highly polar and will compete fiercely with nonpolar or weakly polar organic oxide molecules for adsorption during the adsorption process.

[0007] When the relative humidity (RH) of the exhaust gas exceeds 60%, a large number of water molecules will occupy the micropores of the zeolite, causing the adsorption capacity of the zeolite for organic compounds such as toluene and xylene to decrease exponentially.

[0008] When the RH reaches 80% or higher (such as 100% RH at the outlet of a wet dust collector), the zeolite rotor almost fails, and a large amount of organic compounds penetrate, directly leading to excessive emissions.

[0009] To address the humidity issue, the traditional approach is to use refrigeration dehumidification, cooling the exhaust gas below its dew point to condense the moisture, and then reheating it. However, for industrial exhaust gases with volumes of hundreds of thousands of cubic meters, this process of cooling first and then heating requires massive refrigeration units and consumes enormous amounts of electricity, resulting in extremely high operating costs.

[0010] To address the problem of sticky fine dust, wet electrostatic precipitators (WESPs) have been introduced into industrial waste gas treatment. WESPs utilize high-voltage electric fields and water film flushing technology to efficiently capture PM2.5, acid mist, oil droplets, and heavy metal particles (removal rate >90-99%), with no consumables and low resistance. WESPs serve as the optimal pre-filter to protect downstream adsorption equipment (such as zeolite rotors) from clogging.

[0011] However, the application of WESP further exacerbates the humidity problem. The gas exiting the WESP is not only saturated but may also carry trace amounts of liquid water mist. How to effectively connect a high-efficiency WESP in series with a humidity-sensitive zeolite rotor has become a technical challenge in the industry. Direct series connection will cause rotor failure, while adding a refrigeration dehumidifier in between will result in excessive energy consumption.

[0012] In summary, a system integration method is urgently needed to solve the three major problems mentioned above: dust clogging, high humidity failure, and excessive energy consumption. Summary of the Invention

[0013] This invention provides a method for treating dusty exhaust gas. This method solves the humidity problem caused by wet dust removal by using thermodynamic principles through system integration, achieves perfect coupling between WESP and zeolite rotor, and fully recovers the waste heat of regenerative oxidizer to form a closed-loop control.

[0014] A method for treating dusty exhaust gas includes the following steps: S1. The raw industrial waste gas containing solid particles, oil mist, aerosols and volatile organic compounds is passed into a wet electrostatic precipitator system for electrostatic dust removal treatment, and the treated low-temperature saturated wet waste gas is discharged. S2. The discharged low-temperature saturated wet waste gas is introduced into the humidity control unit to heat the saturated wet waste gas and control the temperature rise of the waste gas to 5°C to 15°C, so that the dry bulb temperature of the waste gas rises while the moisture content remains unchanged, thereby reducing the relative humidity of the waste gas from nearly 100% to below 65%. S3. The treated low-humidity waste gas is sent into the adsorption sector of the zeolite rotor. The high-silicon-alumina ratio hydrophobic zeolite molecules loaded on the zeolite rotor selectively adsorb the organic compound molecules in the waste gas. The purified gas is then discharged into the atmosphere. S4. A small volume of high-temperature desorption gas is introduced and passes in the opposite direction through the desorption sector of the zeolite rotor to release the organic compound components adsorbed in the zeolite channels, forming a high-concentration concentrated waste gas. This concentrated waste gas is then sent to the combustion chamber of the regenerative oxidizer to oxidize and decompose the organic components. S5. The high-temperature purified flue gas generated by the oxidation and decomposition of the regenerative oxidizer is led out after heat exchange through the heat storage body and introduced into the humidity control unit as a heat source to raise the temperature and adjust the humidity of the wet waste gas at the outlet of the wet electrostatic precipitator.

[0015] Preferably, the electrostatic dust removal process specifically includes: After entering the wet electrostatic precipitator, the exhaust gas first passes through a pre-spray layer for cooling and coarse particle washing. Then it enters the high-voltage DC power plant area, where fine dust and droplets are charged and migrate towards the collecting electrode under the action of ion wind generated by corona discharge. The collected pollutants are flushed into the ash hopper through periodic water film rinsing, thereby removing most of the solid suspended matter and soluble droplets in the exhaust gas.

[0016] Preferably, the wet electrostatic precipitator adopts a vertical tubular structure, the anode tube bundle is made of conductive fiberglass or high-grade bidirectional stainless steel and arranged in a honeycomb pattern; the cathode wire is a rigid barbed wire and is suspended in the center of the anode tube.

[0017] Preferably, the temperature of the exhaust gas is controlled below 45°C to meet the activity requirements of the subsequent adsorption material.

[0018] Preferably, the humidity control unit establishes a PID control loop based on the enthalpy-humidity diagram of wet air to control humidity, specifically including: real-time monitoring of the temperature of the exhaust gas at the outlet of the wet electrostatic precipitator and the relative humidity at the inlet of the zeolite rotor; adjusting the flow rate of the heat medium entering the humidity control unit or the opening of the bypass air valve according to the real-time monitoring data; increasing the heat input to raise the dry bulb temperature when the relative humidity is higher than a set threshold; and reducing the heat input or introducing dilution cold air when the rotor inlet temperature exceeds 45°C to protect the structural stability of the zeolite molecular sieve.

[0019] Preferably, the adsorption material of the zeolite rotor is a hydrophobically modified zeolite with a silica to alumina molar ratio greater than 100, preferably an MFI or Beta molecular sieve structure, to minimize the adsorption affinity for water molecules.

[0020] Preferably, the rotational speed of the zeolite rotor is dynamically adjusted according to the inlet organic compound concentration and the adsorption breakthrough curve. Specifically, the method is as follows: The breakthrough curves of the selected zeolite material at different organic compound concentrations were measured to determine the saturated adsorption time required to reach the set breakthrough point at a specific inlet concentration. The concentration of organic compounds at the inlet is monitored in real time. When the concentration of organic compounds at the inlet is detected to increase, the rotor speed is increased to shorten the residence time of zeolite in the adsorption zone and prevent breakthrough due to depletion of adsorption capacity. When the concentration of organic compounds at the inlet is detected to decrease, the rotor speed is decreased to extend the residence time of zeolite in the adsorption zone, so as to improve the concentration ratio and reduce desorption energy consumption. The frequency conversion adjustment range of the rotation speed is limited to 1 to 8 revolutions per hour to ensure that the adsorption efficiency is maintained above 95% under different loads.

[0021] Preferably, the method further includes a pretreatment step, in which a primary cyclone dust collector or venturi scrubber is set up before step S1 to remove coarse dust particles with a diameter greater than 10 in the exhaust gas, thereby reducing the cleaning load and sludge production of the subsequent wet electrostatic precipitator.

[0022] Compared with the prior art, the advantages of this invention are: By using a waste heat and humidity control process, the WESP (best suited for treating complex and dirty waste gases) and the zeolite rotor (best suited for treating low-concentration organic oxides) were successfully connected in series. The WESP protects the rotor from clogging, while the humidity control protects the rotor from water immersion. The two complement each other's weaknesses and extend the lifespan of the core equipment.

[0023] This method abandons energy-intensive refrigeration dehumidification (extremely high electricity consumption) and gas-fired heating dehumidification (high fuel consumption), and instead cleverly utilizes the low-grade waste heat that must be emitted by regenerative thermal oxidation itself. This not only solves the humidity problem, but also recovers the waste heat of regenerative thermal oxidation, significantly reducing operating costs.

[0024] By employing a speed adjustment strategy based on the breakthrough curve, the system can adapt to fluctuations in inlet concentration. It maximizes energy savings at low concentrations (high concentration ratio) and ensures compliance during high concentration surges (high speed to prevent breakthrough), significantly improving the system's process robustness.

[0025] For exhaust gases containing flammable and explosive dust (such as aluminum powder and flour), WESP, as the first process, completely eliminates the risk of dust explosion through water washing and wetting (wet dust removal has no dust cloud), providing inherent safety for subsequent systems. Attached Figure Description

[0026] Figure 1 This is a flowchart of a dust and waste gas treatment method proposed in this invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] A method for treating dusty exhaust gas, based on an exhaust gas treatment system, which mainly includes the following core components: Wet electrostatic precipitator (WESP): Structural form: Vertical flow tube structure; the anode tube is made of conductive fiberglass, which has excellent resistance to acid and alkali corrosion; tube diameter 300mm, tube length 4000mm-5000mm. The cathode wire is made of rigid barbed wire of 2205 duplex stainless steel to enhance discharge intensity and prevent swaying.

[0029] Power supply configuration: It adopts a high-frequency high-voltage switching power supply with a rated output voltage of 80kV and has automatic spark detection and suppression functions.

[0030] Spray system: Set to intermittent rinsing, rinsing once every 4-8 hours for 1-3 minutes, with the rinsing water flowing directly back to the pre-treatment water tank.

[0031] Humidity-regulating heat exchanger: Type: Gas-to-gas plate heat exchanger or finned tube heat exchanger.

[0032] Material: Considering that the exhaust gas from the regenerative oxidation furnace may contain trace amounts of acidic gas, the heat exchange tubes are made of 304 or 316L stainless steel, and the fins are made of hydrophilic aluminum foil or stainless steel.

[0033] Zeolite rotor: Substrate: Ceramic fiber paper honeycomb matrix.

[0034] Adsorbent: Hydrophobic ZSM-5 or Beta zeolite with a high silicon-to-aluminum ratio (Si / Al>150).

[0035] Zones: Adsorption zone (300), Desorption zone (30), Cooling zone (30).

[0036] Intelligent Control Unit (PLC): Core algorithm: Embedded speed PID control module based on Yoon-Nelson adsorption kinetics model.

[0037] A method for treating dusty exhaust gas includes: S1. Wet electrostatic precipitator pretreatment: The raw industrial waste gas containing solid particles, oil mist, aerosols and volatile organic compounds is passed into the wet electrostatic precipitator system for electrostatic dust removal treatment, and the treated low-temperature saturated wet waste gas is discharged.

[0038] Specifically, after entering the wet electrostatic precipitator, the exhaust gas first passes through a pre-spray layer for cooling and coarse particle washing. It then enters the electric field zone through a flow equalization plate. A strong electric field is formed between the cathode wire (discharge electrode) powered by a high-voltage DC power supply (usually negative, 20-80kV) and the grounded anode tube (collecting electrode). Air molecules are ionized, generating a large number of electrons and ions (corona discharge). Dust, oil mist, and acid droplets in the exhaust gas capture ions and become charged as they pass through the electric field. Under the influence of the electric field force, they move towards the anode tube wall and deposit there.

[0039] Since the captured substances may be sticky (such as paint mist) or corrosive (such as acid mist), a water film is formed on the anode tube wall or the tube is periodically cleaned by spraying through nozzles to flush the contaminants into the bottom ash hopper, preventing scale buildup on the electrode plates that could lead to electric field distortion.

[0040] WESP exhibits extremely high removal rates for submicron particles (PM0.1-PM2.5) without the risk of filter clogging, completely eliminating impurities that could potentially poison or clog subsequent zeolite rotors. The outlet gas conditions are low temperature (typically 20-35°C) and water vapor saturated (relative humidity approximately 100%).

[0041] S2. The discharged low-temperature saturated wet exhaust gas is introduced into the humidity control unit. Feedback from temperature and humidity sensors is used to control the heat exchange, limiting the exhaust gas temperature increase to 5°C to 15°C. This ensures the dry-bulb temperature of the exhaust gas rises while the moisture content remains constant, thereby reducing the relative humidity of the exhaust gas from nearly 100% to below 65%. Simultaneously, the maximum temperature is strictly limited to no more than 45°C.

[0042] The humidity control unit establishes a PID control loop based on the enthalpy-humidity diagram of wet air to regulate humidity. Specifically, it includes: real-time monitoring of the temperature of the exhaust gas at the outlet of the wet electrostatic precipitator and the relative humidity at the inlet of the zeolite rotor; adjusting the flow rate of the heat medium entering the humidity control unit or the opening of the bypass air valve according to the real-time monitoring data; increasing the heat input to raise the dry bulb temperature when the relative humidity is higher than the set threshold; and reducing the heat input or introducing dilution cold air when the rotor inlet temperature exceeds the threshold to protect the structural stability of the zeolite molecular sieve.

[0043] This step converts wet flue gas into dry flue gas (in terms of relative humidity), thus relieving the competitive adsorption and blockade of water molecules on the micropores of zeolite.

[0044] S3. The treated low-humidity waste gas is sent into the adsorption sector of the zeolite rotor. The high-silicon-to-alumina ratio hydrophobic zeolite molecules loaded on the zeolite rotor selectively adsorb the organic compound molecules in the waste gas. The purified gas is then discharged into the atmosphere.

[0045] The adsorption material of the zeolite rotor is a hydrophobically modified zeolite (such as ZSM-5 or Beta zeolite with a high silicon-to-alumina ratio), whose lattice structure has a strong affinity for organic molecules and a repulsive force on water molecules.

[0046] Furthermore, the rotation speed of the impeller is not constant but rather controlled by intelligent frequency conversion. The system adjusts based on the adsorption breakthrough curve. The adsorption breakthrough curve reflects the relationship between zeolite adsorption saturation and time at a specific inlet organic compound concentration. When the inlet organic compound concentration increases, the time for zeolite to reach saturation shortens. If the rotation speed remains constant, the zeolite at the end of the adsorption zone may saturate prematurely, leading to organic compound breakthrough (exceeding emission standards). Therefore, this invention monitors the inlet concentration online. When the concentration increases, the rotation speed is automatically increased (18 rph) to allow unsaturated zeolite to enter the regeneration zone more quickly; conversely, when the concentration decreases, the rotation speed is reduced to increase the concentration ratio, thereby reducing desorption air volume and energy consumption.

[0047] S4. A small volume of high-temperature desorption gas is introduced and passes in the opposite direction through the desorption sector of the zeolite rotor, releasing the organic compound components adsorbed in the zeolite channels to form a high-concentration concentrated waste gas. This concentrated waste gas is then sent to the combustion chamber of the regenerative oxidizer. In the combustion chamber, the organic matter undergoes an oxidation reaction at a high temperature of >760℃ and is decomposed into carbon dioxide and water, producing high-temperature purified flue gas. S5. The high-temperature purified flue gas generated by the oxidation and decomposition of the regenerative oxidizer is led out after heat exchange by the heat storage body. It is first used to heat the air for desorption (heating the room temperature air to 180-220℃). The flue gas after the above utilization, or the excess hot flue gas discharged from the regenerative oxidation, is transported to the heat exchanger in step S2 for heating and humidifying the exhaust gas at the WESP outlet.

[0048] This cascade utilization maximizes energy efficiency, so that the entire system requires almost no additional fuel consumption during normal operation (self-heating operation state), except for the power consumption of the wind turbine.

[0049] Example 1: Treatment of exhaust gas from painting workshop in automobile painting (high humidity / viscous particulate conditions).

[0050] In this embodiment, the exhaust gas has the following specific characteristics: Air volume: 100,000 Nm / h.

[0051] Composition: Contains paint mist particles (viscous) and organic oxides (mainly xylene and butyl acetate, with an average concentration of 300 mg / m³ and a fluctuation range of 200-600 mg / m³).

[0052] Inlet conditions: After passing through the water swirl spray booth, the temperature is 25℃, the relative humidity is 95%-100%, and it contains a large amount of fine paint mist and water mist.

[0053] The specific processing flow includes: Step 1: Deep dust removal. The raw exhaust gas is introduced into the WESP system for electrostatic dust removal. The WESP system operates at a stable voltage of 55kV and a secondary current of 400mA.

[0054] After WESP treatment, more than 99% of paint mist particles (outlet particulate matter concentration <1mg / m³) and liquid water droplets were removed from the original waste.

[0055] The temperature of the discharged low-temperature saturated wet exhaust gas is around 23℃ (slightly lower due to water washing), and the relative humidity is close to 100% (saturated).

[0056] Step 2: Thermal control. The discharged low-temperature saturated wet waste gas is introduced into the humidity control unit to heat the saturated wet waste gas.

[0057] In this step, the target relative humidity at the rotor inlet is set to be less than 60%.

[0058] The 120°C hot flue gas discharged from the regenerative oxidation system is used to heat the main exhaust gas through a heat exchanger.

[0059] Ultimately, the main exhaust gas temperature rose from 23℃ to 33℃ (a 10℃ increase). Referring to the enthalpy-humidity chart, the moisture content of saturated air at 23℃ is approximately 17.5 g / kg dry air; after rising to 33℃, the saturated moisture content should be 32.5 g / kg, thus the relative humidity drops to 17.5 / 32.554%. This state meets the requirements for zeolite adsorption.

[0060] Step 3: Rotary adsorption and regenerative oxidation.

[0061] Initial setup: Organic oxide concentration 300 mg / m³, PLC-controlled impeller speed 3.5 rpm. Concentration ratio set to 15 times.

[0062] Variable frequency control process: When the production line was being cleaned to change color, the concentration of organic oxides at the inlet soared to 600 mg / m³.

[0063] At this point, the PID controller calculates based on the Yoon-Nelson model that if the pH is maintained at 3.5, the adsorption breakthrough time will be shortened to less than the residence time of zeolite in the adsorption zone, thus posing a breakthrough risk.

[0064] Therefore, the controller outputs a signal, and the frequency converter drives the motor to accelerate, linearly increasing the speed to 6.8 rph.

[0065] Although the concentration ratio decreased slightly (from 15 times to about 12 times), it ensured that all high-concentration waste gas was transferred out of the adsorption zone and into the desorption zone before penetration, and the concentration of organic oxides at the outlet remained stable below 10 mg / m³.

[0066] Finally, when the concentration dropped to 300 mg / m³, the rotation speed was smoothly adjusted back to 3.5 rph to save energy consumption during the operation of the regenerative oxidizer.

[0067] Example 2: Treatment of mixed emissions of acid, alkali and organic waste gas in the semiconductor industry (corrosive / safety conditions).

[0068] In this embodiment, the exhaust gas has the following characteristics: air volume of 50,000 Nm / h, containing HF acid mist (3 mg / m³), fine particles (silica dust) and IPA (isopropanol, concentration 100-200 mg / m³).

[0069] Regarding this type of exhaust gas, this embodiment adopts a different approach from Embodiment 1 in the following aspects: WESP Material Selection: To prevent HF acid corrosion, in this embodiment, the WESP anode tube and shell are all made of corrosion-resistant vinyl ester resin conductive fiberglass, and the cathode wire is made of Hastelloy C276 material.

[0070] Humidity control strategy adjustment: The exhaust temperature of the semiconductor plant is kept constant at 22°C year-round. The system is set to heat up to 35°C, reducing the relative humidity to around 45%. Because IPA is highly polar and more sensitive to competitive adsorption of moisture, a lower target relative humidity value (<50%) is set to ensure adsorption efficiency.

[0071] Safety adjustment: IPA is flammable. The system adds LEL (lower explosive limit) detection linkage. When the desorbed gas concentration of the rotor exceeds 25% LEL, the system automatically performs two operations: (1) opening the fresh air dilution valve; (2) forcibly increasing the rotor speed to reduce the adsorption saturation, thereby reducing the desorption concentration.

[0072] In summary, this invention eliminates the energy-intensive refrigeration and dehumidification process through thermal integration design, saving significant operating costs. At the same time, due to the efficient protection of WESP, the replacement cycle of the core consumable zeolite rotor is significantly extended, greatly reducing the total life cycle cost.

[0073] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for treating dusty exhaust gas, characterized in that, Includes the following steps: S1. The raw industrial waste gas containing solid particles, oil mist, aerosols and volatile organic compounds is passed into a wet electrostatic precipitator system for electrostatic dust removal treatment, and the treated low-temperature saturated wet waste gas is discharged. S2. The discharged low-temperature saturated wet waste gas is introduced into the humidity control unit to heat the saturated wet waste gas and control the temperature rise of the waste gas to 5°C to 15°C, so that the dry bulb temperature of the waste gas rises while the moisture content remains unchanged, thereby reducing the relative humidity of the waste gas from nearly 100% to below 65%. S3. The treated low-humidity waste gas is sent into the adsorption sector of the zeolite rotor. The high-silicon-alumina ratio hydrophobic zeolite molecules loaded on the zeolite rotor selectively adsorb the organic compound molecules in the waste gas. The purified gas is then discharged into the atmosphere. S4. A small volume of high-temperature desorption gas is introduced and passes in the opposite direction through the desorption sector of the zeolite rotor to release the organic compound components adsorbed in the zeolite channels, forming a high-concentration concentrated waste gas. This concentrated waste gas is then sent to the combustion chamber of the regenerative oxidizer to oxidize and decompose the organic components. S5. The high-temperature purified flue gas generated by the oxidation and decomposition of the regenerative oxidizer is led out after heat exchange through the heat storage body and introduced into the humidity control unit as a heat source to raise the temperature and adjust the humidity of the wet waste gas at the outlet of the wet electrostatic precipitator.

2. The method for treating dusty exhaust gas according to claim 1, characterized in that, The electrostatic dust removal process specifically includes: After entering the wet electrostatic precipitator, the exhaust gas first passes through a pre-spray layer for cooling and coarse particle washing. Then it enters the high-voltage DC power plant area, where fine dust and droplets are charged and migrate towards the collecting electrode under the action of ion wind generated by corona discharge. The collected pollutants are flushed into the ash hopper through periodic water film rinsing, thereby removing most of the solid suspended matter and soluble droplets in the exhaust gas.

3. The method for treating dusty exhaust gas according to claim 1, characterized in that, The wet electrostatic precipitator adopts a vertical tubular structure. The anode tube bundle is made of conductive fiberglass or high-grade bidirectional stainless steel and is arranged in a honeycomb pattern. The cathode wire is a rigid barbed wire that is suspended in the center of the anode tube.

4. The method for treating dusty exhaust gas according to claim 1, characterized in that, The temperature of the exhaust gas is controlled below 45°C to meet the activity requirements of the subsequent adsorption materials.

5. The method for treating dusty exhaust gas according to claim 1, characterized in that, The humidity control unit establishes a PID control loop based on the enthalpy-humidity diagram of wet air to regulate humidity. Specifically, it includes: real-time monitoring of the temperature of the exhaust gas at the outlet of the wet electrostatic precipitator and the relative humidity at the inlet of the zeolite rotor; adjusting the flow rate of the heat medium entering the humidity control unit or the opening of the bypass air valve according to the real-time monitoring data; increasing the heat input to raise the dry bulb temperature when the relative humidity is higher than the set threshold; and reducing the heat input or introducing dilution cold air when the rotor inlet temperature exceeds 45°C to protect the structural stability of the zeolite molecular sieve.

6. The method for treating dusty exhaust gas according to claim 1, characterized in that, The adsorption material of the zeolite rotor is hydrophobically modified zeolite with a silica to alumina molar ratio greater than 100. MFI or Beta molecular sieve structures are preferred to minimize the adsorption affinity for water molecules.

7. The method for treating dusty exhaust gas according to claim 1, characterized in that, The rotational speed of the zeolite rotor is dynamically adjusted based on the inlet organic compound concentration and the adsorption breakthrough curve. The specific method is as follows: The breakthrough curves of the selected zeolite material at different organic compound concentrations were measured to determine the saturated adsorption time required to reach the set breakthrough point at a specific inlet concentration. The concentration of organic compounds at the inlet is monitored in real time. When the concentration of organic compounds at the inlet is detected to increase, the speed of the rotor is increased to shorten the residence time of the zeolite in the adsorption zone and prevent breakthrough due to depletion of adsorption capacity. When the concentration of organic compounds at the inlet is detected to decrease, the rotor speed is reduced to prolong the residence time of zeolite in the adsorption zone, thereby increasing the concentration ratio and reducing desorption energy consumption. The frequency conversion adjustment range of the rotation speed is limited to 1 to 8 revolutions per hour to ensure that the adsorption efficiency is maintained above 95% under different loads.

8. The method for treating dusty exhaust gas according to claim 1, characterized in that, The method also includes a pretreatment step, in which a primary cyclone dust collector or venturi scrubber is set up before step S1 to remove coarse dust particles with a diameter greater than 10 in the exhaust gas, thereby reducing the cleaning load and sludge production of the subsequent wet electrostatic precipitator.

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