A device for off-line regeneration of low-temperature de-nitrification catalyst by microwave

Abstract

The application provides a device for regenerating low-temperature deactivated denitration catalysts offline by using microwaves, comprising: a device shell provided with a microwave resonance cavity and an air inlet channel and an air outlet channel respectively connected with the microwave resonance cavity; a microwave generator arranged in the microwave resonance cavity and used for applying microwaves to the denitration catalyst; a monitoring assembly used for monitoring the weight and the surface temperature of the denitration catalyst in real time; an air exchange assembly arranged in the air outlet channel and used for allowing external air to enter the microwave resonance cavity from the air inlet channel; and a control center electrically connected with the monitoring assembly, the air exchange assembly and the microwave generator and configured to control the air exchange assembly and the microwave generator according to the weight and the temperature so as to regenerate the denitration catalyst. The device can regenerate the low-temperature deactivated denitration catalyst, and can save energy consumption and avoid the sintering side effect of high temperature on the microstructure of the catalyst compared with the existing regeneration process.

Description

Technical Field

[0001] This application relates to the field of catalyst regeneration technology, and more specifically, to a device for offline microwave regeneration of low-temperature deactivated denitration catalysts. Background Technology

[0002] Selective catalytic reduction (SCR) is a major method for flue gas denitrification. This method uses ammonia as a reducing agent, with the aid of a catalyst, to reduce nitrogen oxides in flue gas into harmless nitrogen and water. The performance of the denitrification catalyst is crucial to the operation of SCR denitrification equipment.

[0003] However, when denitrification catalysts operate for extended periods in low-temperature (e.g., <300℃) flue gas environments, ammonium bisulfate or other ammonium salts are prone to deposit on the catalyst surface, leading to reduced catalyst activity or even deactivation. For some equipment, such as SCR equipment in waste-to-energy plants, certain types of organic matter may also deposit as they pass through the catalyst. These catalyst deactivation phenomena caused by various reasons are collectively referred to as low-temperature catalyst deactivation.

[0004] Low-temperature catalyst deactivation is a widespread problem and is becoming increasingly prominent. If deactivated catalysts cannot be effectively regenerated, it will not only reduce denitrification efficiency and increase the environmental and economic costs of power plants, but also cause secondary pollution. Therefore, developing efficient low-temperature deactivation and regeneration methods for denitrification catalysts is of significant practical importance.

[0005] Currently, common methods for regenerating low-temperature deactivated catalysts include high-temperature calcination, water washing, or chemical cleaning. These methods have problems such as high energy consumption, incomplete regeneration, and easy damage to the catalyst. Summary of the Invention

[0006] This application provides at least one device for offline microwave regeneration of low-temperature deactivated denitration catalysts. This device can regenerate low-temperature deactivated denitration catalysts and, compared with existing regeneration processes, can save energy and avoid the side effects of sintering that may occur on the microstructure of the catalyst due to high temperature.

[0007] This application provides an apparatus for offline microwave regeneration of a low-temperature deactivated denitration catalyst, comprising: The device housing is provided with a microwave resonant cavity and an air inlet and an air outlet respectively connected to the microwave resonant cavity; A support device is disposed within the microwave resonant cavity to support the denitrification catalyst to be regenerated; A microwave generator is disposed within the microwave resonant cavity to apply microwaves to the denitration catalyst; The monitoring component includes a load sensor and a temperature sensor. The load sensor is disposed in the microwave resonant cavity to monitor the weight of the denitration catalyst in real time, and the temperature sensor is disposed in the microwave resonant cavity to monitor the surface temperature of the denitration catalyst in real time. The ventilation assembly includes an exhaust fan, which is disposed in the exhaust duct to allow external gas to enter the microwave resonant cavity from the intake duct. The control center, which is electrically connected to the monitoring component, the ventilation component, and the microwave generator respectively, is configured to control the ventilation component and the microwave generator according to the weight and the temperature to regenerate the denitrification catalyst.

[0008] In one alternative embodiment, the device housing is provided with a track, the support device is disposed on the track and is movable along the extension direction of the track to enter and exit the microwave resonant cavity.

[0009] In one optional embodiment, there are multiple microwave generators, each disposed at a different position within the microwave resonant cavity.

[0010] In one optional embodiment, the ventilation assembly further includes a preheating assembly disposed in the air intake duct for preheating the gas entering the air intake duct.

[0011] In one optional embodiment, the ventilation assembly further includes an external air source connected to the air intake end of the air intake duct for supplying inert gas into the air intake duct.

[0012] In one alternative implementation, the controller is specifically configured as follows: The ventilation assembly and the microwave generator are started. Calculate the difference between the initial weight and the current weight of the denitrification catalyst; When the difference reaches the target weight, the microwave generator is controlled to stop running, while the induced draft fan is controlled to continue running. After the induced draft fan has continued to run for the target duration, the induced draft fan is controlled to stop running. When the temperature drops to the target temperature, a regeneration completion signal is output.

[0013] In one alternative implementation, after the control ventilation assembly and the microwave generator are started, the control center is further configured to control the ventilation assembly and the microwave generator to stop operating when the temperature rises to a temperature threshold.

[0014] In one optional embodiment, the monitoring component further includes a pressure sensor disposed within the microwave resonant cavity for real-time monitoring of the internal air pressure of the microwave resonant cavity. After the ventilation assembly and the microwave generator are started, the control center is also configured to adjust the wind speed of the induced draft fan according to the air pressure.

[0015] In one optional embodiment, the monitoring component further includes a gas analyzer disposed within the exhaust gas duct for real-time monitoring of exhaust gas composition. After the ventilation assembly and the microwave generator are started, the control center is also configured to adjust the wind speed of the induced draft fan and / or control the ventilation assembly and the microwave generator to stop operating according to the exhaust composition.

[0016] In one optional implementation, the control center is equipped with a human-machine interface for setting process parameters.

[0017] The above-mentioned technical solution of this application has the following beneficial technical effects: The device for offline microwave regeneration of low-temperature deactivated denitration catalysts, as described in this application, can regenerate low-temperature deactivated denitration catalysts while avoiding the sintering side effects that high temperatures may cause on the catalyst's microstructure. Furthermore, the device features online monitoring and intelligent endpoint determination, replacing the cumbersome traditional cycle of "processing-cooling-removal-weighing-reprocessing," thus saving energy and significantly reducing the total processing time.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this application and, together with the specification, serve to explain the technical solutions of this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of an apparatus for offline regeneration of a low-temperature deactivated denitration catalyst using microwave, provided in an embodiment of this application, is shown. In the diagram: 1. Equipment casing; 11. Microwave resonant cavity; 12. Air inlet duct; 13. Air outlet duct; 2. Support device; 3. Microwave generator; 4. Load cell; 5. Temperature sensor; 6. Exhaust fan; 7. Air inlet valve; 8. Air outlet valve; 9. Preheating module; 10. Gas analyzer. Detailed Implementation

[0021] Various exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application.

[0022] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Currently, common methods for regenerating low-temperature deactivated catalysts include high-temperature calcination, water washing, or chemical cleaning. These methods have problems such as high energy consumption, incomplete regeneration, and easy damage to the catalyst.

[0027] Therefore, this application provides an apparatus for offline microwave regeneration of low-temperature deactivated denitration catalysts. This apparatus can regenerate low-temperature deactivated denitration catalysts and, compared with existing regeneration processes, can save energy and avoid the side effects of sintering that may occur on the microstructure of the catalyst due to high temperature.

[0028] like Figure 1 As shown, the device for offline microwave regeneration of low-temperature deactivated denitration catalyst includes a housing 1, a support device 2, a microwave generator 3, a monitoring component, a ventilation component, and a control center. The housing 1 has a microwave resonant cavity 11 and an inlet duct 12 and an outlet duct 13 connected to the microwave resonant cavity 11. The support device 2 is located inside the microwave resonant cavity 11 and is used to support the denitration catalyst to be regenerated. The microwave generator 3 is located inside the microwave resonant cavity 11 and is used to apply microwaves to the denitration catalyst to remove ammonium salts such as ammonium bisulfate and organic matter deposited on the catalyst. The monitoring component includes a load sensor 4 and a temperature sensor 5. The load sensor 4 is located inside the microwave resonant cavity 11 to monitor the weight of the denitration catalyst in real time, and the temperature sensor 5 is located inside the microwave resonant cavity 11 to monitor the surface temperature of the denitration catalyst in real time. The ventilation assembly includes an induced draft fan 6, which is located in the exhaust duct 13 to allow outside air to enter the microwave resonant cavity 11 from the intake duct 12 and exit from the exhaust duct 13, thereby carrying away the deposited material decomposed during the regeneration process and helping to maintain the internal temperature of the microwave resonant cavity 11. The control center is electrically connected to the monitoring assembly, the ventilation assembly, and the microwave generator 3, and is configured to control the ventilation assembly and the microwave generator 3 based on weight and temperature to regenerate the denitrification catalyst.

[0029] In some embodiments, the device housing 1 is made of stainless steel with microwave shielding properties. Additionally, the inner wall of the cavity may be coated with a corrosion-resistant, microwave-absorbing material such as silicon carbide to reduce standing wave effects and improve energy utilization efficiency.

[0030] In some embodiments, the device housing 1 is provided with a track, and the support device 2 is disposed on the track and is movable along the extension direction of the track to enter and exit the microwave resonant cavity 11. In a specific configuration, the track can be disposed on the bottom surface of the microwave resonant cavity 11. This configuration allows the operator to easily push and pull the support device 2 in and out for loading and unloading the catalyst.

[0031] In some embodiments, the carrier device 2 may be made of a microwave-transparent material (such as polytetrafluoroethylene or quartz ceramic).

[0032] In some embodiments, the carrier device 2 is provided with a grid or positioning structure for positioning the catalyst. This arrangement ensures that the catalyst (honeycomb or plate type) can be neatly and stably arranged and fixed on the material cart, preventing displacement, collision or tipping during transportation, thereby avoiding catalyst damage; at the same time, precise positioning ensures that the relative position of each catalyst piece in the microwave resonant cavity 11 is consistent, which helps to achieve uniform and efficient microwave irradiation, and improves the stability and treatment effect of the regeneration or reaction process.

[0033] In some embodiments, the support device 2 is provided with rollers. By using the rollers in conjunction with the track, the resistance when the support device 2 moves can be reduced, and the convenience of operation can be improved.

[0034] In some embodiments, there are multiple microwave generators 3, each disposed at a different location within the microwave resonant cavity 11. Specifically, the microwave generators 3 can be disposed on the top and side surfaces of the microwave resonant cavity 11. This arrangement enables multi-point input and optimized spatial distribution of microwave energy within the cavity, effectively improving the uniformity of the heating or reaction area and avoiding hotspot concentration or energy dead zones caused by single-point feed. Simultaneously, by independently controlling the output power and phase of each generator, the electromagnetic field distribution within the cavity can be dynamically adjusted, enhancing process control flexibility and improving overall energy utilization efficiency and system processing capacity. It should be understood that in practical applications, in some embodiments, a mode stirrer can also be disposed within the microwave resonant cavity 11. The low-speed rotation of the mode stirrer continuously alters the reflection path of microwaves within the microwave resonant cavity 11, further disrupting the formation of standing waves.

[0035] In some embodiments, the load cell 4 is a pressure sensor. In specific configurations, there are multiple load cells 4, each positioned below the track. It should be understood that in practical applications, the load cell 4 should have high-temperature resistance.

[0036] In some embodiments, the temperature sensor 5 is a non-contact temperature sensor 5. In a specific configuration, there are multiple temperature sensors 5, which are respectively disposed at different positions on the inner wall of the resonant cavity (such as the top surface and the side surface).

[0037] In some embodiments, the monitoring component further includes a pressure sensor disposed within the microwave resonant cavity 11 to monitor the internal air pressure of the microwave resonant cavity 11 in real time.

[0038] In some embodiments, the monitoring component further includes a gas analyzer 10, which is disposed within the exhaust gas duct 13 to monitor the exhaust gas composition in real time. Specifically, the gas analyzer 10 can be an electrochemical or laser sensor. In practical use, the gas analyzer 10 can specifically monitor the concentration of specific components (such as NH3 and SOx) in the exhaust gas in real time. Furthermore, the gas analyzer 10 can display a curve showing the change in the concentration of decomposable products, which can serve as an auxiliary basis for determining the reaction rate and regeneration endpoint.

[0039] In some embodiments, the monitoring component further includes an oxygen sensor disposed within the microwave resonant cavity 11 to monitor the oxygen content inside the microwave resonant cavity 11 in real time.

[0040] In some embodiments, the exhaust fan 6 of the ventilation assembly is a variable frequency speed control fan, whose speed can be automatically adjusted by the control center according to the set ventilation ratio or the internal pressure of the microwave resonant cavity 11, so as to achieve precise control of the gas flow rate.

[0041] In some embodiments, the ventilation assembly further includes an inlet valve 7 and an outlet valve 8, with the inlet valve 7 disposed in the inlet air duct 12 and the outlet valve 8 disposed in the outlet air duct 13. In actual use, the inlet valve 7 and the outlet valve 8 are opened first, and then the induced draft fan 6 is started. After the regeneration process is completed, the control center can control the inlet valve 7 and the outlet valve 8 to automatically close.

[0042] In some embodiments, the ventilation assembly further includes a preheating assembly disposed in the intake duct 12 to preheat the gas entering the intake duct 12. Specifically, the preheating assembly may employ one or more electric heaters. This configuration allows the preheating assembly to preheat the gas entering the microwave resonant cavity 11, helping to improve regeneration efficiency, especially when processing catalysts with high water content. It should be understood that in practical applications, the preheating assembly can preheat the gas to 25°C, 50°C, 100°C, 150°C, 200°C, or 250°C, etc.

[0043] In some embodiments, the ventilation assembly further includes an external air source connected to the air inlet of the air inlet duct 12, for introducing an inert gas (such as nitrogen, argon, or helium) into the air inlet duct 12. This arrangement prevents the catalyst from adversely reacting with oxygen, moisture, or other harmful gases in the air during the treatment process, thereby affecting the performance and regeneration effect of the catalyst.

[0044] In some embodiments, the controller is specifically configured to: control the ventilation assembly and microwave generator 3 to start; calculate the difference between the initial weight and the current weight of the denitrification catalyst; when the difference reaches the target weight, control the microwave generator 3 to stop running and control the induced draft fan 6 to continue running; after the induced draft fan 6 continues running for the target time, control the induced draft fan 6 to stop running; and output a regeneration completion signal when the temperature drops to the target temperature.

[0045] In some embodiments, the control center is also configured to stop the operation of the ventilation assembly and the microwave generator 3 when the temperature rises to a temperature threshold. For example, the temperature threshold can be set to 300°C. When the temperature on the catalyst surface exceeds the temperature threshold, an abnormal temperature can be determined, and the control center can then force a shutdown, stopping the operation of the ventilation assembly and the microwave generator 3. This effectively prevents the catalyst body from overheating and sintering due to "thermal runaway".

[0046] In some embodiments, the control center is also configured to adjust the airflow speed of the induced draft fan 6 according to the air pressure. This ability to adjust the airflow speed of the induced draft fan 6 based on the internal air pressure of the microwave resonant cavity 11 avoids affecting the device's sealing performance or process stability due to excessively high or low pressure. Specifically, excessively high internal air pressure in the microwave resonant cavity 11 may cause problems such as deformation and leakage, while excessively low internal air pressure may affect process stability.

[0047] In some embodiments, the control center is also configured to adjust the speed of the induced draft fan 6 according to changes in the exhaust gas composition. For example, when the concentrations of NH3 and SOx in the exhaust gas reach their peak values, the control center can control the induced draft fan 6 to reduce its speed. In other words, the exhaust gas composition can serve as an auxiliary basis for determining the reaction rate.

[0048] In some embodiments, the control center is also configured to control the ventilation assembly and microwave generator 3 to stop operating based on changes in exhaust gas composition. For example, when the concentrations of NH3 and SOx in the exhaust gas are essentially zero, it can be determined that catalyst regeneration is complete, and the control center can control the microwave generator 3 to stop operating and control the induced draft fan 6 to continue operating for a target duration before stopping. In other words, exhaust gas composition can serve as an auxiliary basis for determining the end point of regeneration.

[0049] In some embodiments, the control center is equipped with a human-machine interface (HMI) for setting process parameters and controlling equipment to start with a single button. For example, process parameters include microwave power, microwave time, target weight loss rate, temperature threshold, and ventilation rate. One-button start-up and automated process control reduce the skill requirements for operators and enable standardized, repeatable regeneration operations.

[0050] In some embodiments, the control center has safety interlock logic to prevent the microwave generator 3 from starting or to stop immediately when abnormal data is detected, and to issue an audible and visual alarm. The robust safety interlock design and automated operating procedures minimize human error and eliminate the risk of microwave and harmful gas leaks.

[0051] In some embodiments, the device housing 1 has a device door, which employs a microwave leakage resistant structure with multiple microswitches to ensure operator safety.

[0052] The device for offline microwave regeneration of low-temperature deactivated denitration catalysts, as described in this application, can regenerate low-temperature deactivated denitration catalysts while avoiding the sintering side effects that high temperatures may cause on the catalyst's microstructure. Furthermore, the device features online monitoring and intelligent endpoint determination, replacing the cumbersome traditional cycle of "processing-cooling-removal-weighing-reprocessing," thus saving energy and significantly reducing the total processing time.

[0053] Example 1 The object being processed is the catalyst for Project A, used in a waste-to-energy plant. It is a corrugated plate type, with a single module volume of approximately 1 cubic meter.

[0054] The processing steps are as follows: 1) Loading: After purging the catalyst module with compressed air to remove ash, its initial weight was measured to be 422.7 kg. It was then placed on the support device, pushed into the microwave resonant cavity, and the equipment door was closed.

[0055] 2) Setting parameters: Total microwave power is 40kW (the system can automatically adjust according to temperature feedback); target weight loss is >25kg; surface temperature threshold is 300℃; air exchange rate is 10 times / hour (automatically maintained by the variable frequency induced draft fan).

[0056] 3) Execution and Monitoring: A. Start-up Procedure. The equipment automatically turns on the induced draft fan and valves, and then starts the microwave system.

[0057] B. Real-time display of the human-machine interface: a) Weight curve: The initial reading was 422.7 kg, and it began to decline smoothly. After about 30 minutes, the online weighing system displayed a weight of 410.4 kg, and after about 60 minutes, the displayed weight was 397.8 kg; b) Temperature curve: The readings of multiple infrared probes fluctuated between 285℃ and 295℃, without reaching the upper limit of 300℃; c) Gas concentration curve: The outlet gas analyzer showed that the NH3 concentration was at its peak within 5-40 minutes after the start of the treatment, and then dropped rapidly.

[0058] C. After about 85 minutes of processing, the online weighing display showed a weight of 396.0 kg, reaching the preset target weight loss value.

[0059] D. The central control system determines that regeneration is complete, automatically stops microwave emission, and the induced draft fan continues to run for 15 minutes for purging and cooling.

[0060] E. Once the catalyst surface temperature drops below 60°C, the system will prompt that it can be unloaded.

[0061] 4) Results: The catalyst was removed, and its weight was verified offline to be 396.0 kg. Its microscopic specific surface area was measured to be 58.3 m² / g, compared to the untreated area (31.5 m² / g), indicating that the pore blockage was efficiently and precisely removed. The entire process required no manual intervention or mid-process weighing.

[0062] Example 2 The catalyst being treated is Project B catalyst used in a coal-fired power plant. It is honeycomb type, with each module having a volume of approximately 1 cubic meter. Some deactivated catalysts may have small amounts of flammable organic matter deposited on them. Using an inert atmosphere can increase safety.

[0063] The processing steps are as follows: 1) Loading: After purging the catalyst module with compressed air to remove ash, its initial weight was measured to be 763.5 kg. It was then placed on the support device, pushed into the microwave resonant cavity, and the equipment door was closed.

[0064] 2) Setting parameters: Total microwave power is 60kW (the system can automatically adjust according to temperature feedback); target weight loss is >25kg; surface temperature threshold is 300℃.

[0065] 3) Set the ventilation program: After startup, first introduce nitrogen gas for 5 minutes to replace the oxygen content in the cavity to below 2% (confirmed by the oxygen sensor in the cavity), and then start microwave treatment.

[0066] 4) Execution and Monitoring: A. The equipment first performs a nitrogen purging procedure. After the purging is completed, the microwave system is automatically started.

[0067] B. Monitor weight changes in real time.

[0068] C. After about 165 minutes of processing, the online weighing display showed a weight of 723.2 kg, reaching the preset target weight loss value.

[0069] D. The central control system determines that regeneration is complete, automatically stops microwave emission, and continues to introduce nitrogen gas for cooling to prevent the high-temperature catalyst from coming into contact with air.

[0070] E. Once the catalyst surface temperature drops below 60°C, the system will prompt that it can be unloaded.

[0071] 5) Results: The final catalyst weight was 723.2 kg, and the microscopic specific surface area recovered from 38.3 m² / g to 47.2 m² / g. The regeneration process was completed safely and efficiently under an inert atmosphere.

[0072] One or more embodiments in this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this specification should be included within the protection scope of this application.

[0073] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for offline microwave regeneration of a low-temperature deactivated denitration catalyst, characterized in that, include: The device housing is provided with a microwave resonant cavity and an air inlet and an air outlet respectively connected to the microwave resonant cavity; A support device is disposed within the microwave resonant cavity to support the denitrification catalyst to be regenerated; A microwave generator is disposed within the microwave resonant cavity to apply microwaves to the denitration catalyst; The monitoring component includes a load sensor and a temperature sensor. The load sensor is disposed in the microwave resonant cavity to monitor the weight of the denitration catalyst in real time, and the temperature sensor is disposed in the microwave resonant cavity to monitor the surface temperature of the denitration catalyst in real time. The ventilation assembly includes an exhaust fan, which is disposed in the exhaust duct to allow external gas to enter the microwave resonant cavity from the intake duct. The control center, which is electrically connected to the monitoring component, the ventilation component, and the microwave generator respectively, is configured to control the ventilation component and the microwave generator according to the weight and the temperature to regenerate the denitrification catalyst.

2. The equipment for offline microwave regeneration of low-temperature deactivated denitration catalyst according to claim 1, characterized in that, The device housing is provided with a track, and the supporting device is disposed on the track and can move along the extension direction of the track to enter and exit the microwave resonant cavity.

3. The equipment for offline microwave regeneration of low-temperature deactivated denitration catalyst according to claim 1, characterized in that, The number of microwave generators is multiple, and the multiple microwave generators are respectively arranged in different positions within the microwave resonant cavity.

4. The equipment for offline microwave regeneration of low-temperature deactivated denitration catalyst according to claim 1, characterized in that, The ventilation assembly further includes a preheating assembly, which is disposed in the air intake duct to preheat the gas entering the air intake duct.

5. The equipment for offline microwave regeneration of low-temperature deactivated denitration catalyst according to claim 1, characterized in that, The ventilation assembly also includes an external air source, which is connected to the air intake end of the air intake duct to introduce inert gas into the air intake duct.

6. The equipment for offline microwave regeneration of low-temperature deactivated denitration catalyst according to claim 1, characterized in that, The controller is specifically configured as follows: The ventilation assembly and the microwave generator are started. Calculate the difference between the initial weight and the current weight of the denitrification catalyst; When the difference reaches the target weight, the microwave generator is controlled to stop running, while the induced draft fan is controlled to continue running. After the induced draft fan has continued to run for the target duration, the induced draft fan is controlled to stop running. When the temperature drops to the target temperature, a regeneration completion signal is output.

7. The equipment for offline microwave regeneration of low-temperature deactivated denitration catalyst according to claim 6, characterized in that, After the ventilation assembly and the microwave generator are started, the control center is also configured to control the ventilation assembly and the microwave generator to stop operating when the temperature rises to a temperature threshold.

8. The equipment for offline microwave regeneration of low-temperature deactivated denitration catalyst according to claim 6, characterized in that, The monitoring component also includes a pressure sensor, which is disposed inside the microwave resonant cavity to monitor the internal air pressure of the microwave resonant cavity in real time. After the ventilation assembly and the microwave generator are started, the control center is also configured to adjust the wind speed of the induced draft fan according to the air pressure.

9. The equipment for offline microwave regeneration of low-temperature deactivated denitration catalyst according to claim 6, characterized in that, The monitoring component also includes a gas analyzer, which is installed in the exhaust gas duct to monitor the exhaust gas composition in real time. After the ventilation assembly and the microwave generator are started, the control center is also configured to adjust the wind speed of the induced draft fan and / or control the ventilation assembly and the microwave generator to stop operating according to the exhaust composition.

10. The equipment for offline microwave regeneration of low-temperature deactivated denitration catalyst according to claim 1, characterized in that, The control center is equipped with a human-machine interface, which is used to set process parameters.

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