A nitrogen-protected spiral-sealed explosion-proof heater

Abstract

This invention discloses a nitrogen-protected rotary seal explosion-proof heater, comprising an explosion-proof housing, a heating module, a rotary sealing device, a nitrogen protection module, a control module, and a protection device. The heating module is located inside the explosion-proof housing and uses electric heating. The rotary sealing device includes a rotating shaft, a sealing ring, a bearing, and a drive device to ensure an effective seal during heater operation. The nitrogen protection module continuously supplies nitrogen to maintain a positive pressure environment inside that is higher than outside, preventing the entry of external hazardous gases. The control module monitors the heating power, nitrogen flow rate, and sealing status in real time through an intelligent controller and sensors. The protection device provides over-temperature, over-pressure, and power failure protection. This invention achieves long-term stable explosion-proof performance and is easy to operate during maintenance.

Description

Technical Field

[0001] This invention relates to a nitrogen-protected rotary seal explosion-proof heater. Background Technology

[0002] Existing explosion-proof heaters are prone to problems such as seal aging, external oxygen infiltration, and overheating when operating in high-risk environments. This is especially true in flammable and explosive industries like petroleum and chemicals, where these issues can lead to fires or explosions. Traditional explosion-proof heaters primarily rely on physical seals and external coatings to prevent explosive gas leaks or ignition by external sparks; however, these measures often fail over long-term use, creating safety hazards. Furthermore, because heaters operate at high temperatures, their explosion-proof performance gradually decreases with the aging of sealing materials or changes in environmental pressure, affecting the reliability and lifespan of the equipment.

[0003] The market urgently needs a new type of heating equipment with more reliable and durable explosion-proof performance, especially in harsh environments with high temperature and frequent pressure fluctuations, which can effectively prevent external air from entering the heater and fundamentally solve the safety problem of heating equipment in high-risk environments.

[0004] Therefore, those skilled in the art urgently need an explosion-proof heater that can provide stable nitrogen protection and maintain a positive pressure state to avoid oxidation and fire risks caused by oxygen infiltration, thereby improving the safety and lifespan of the equipment. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a nitrogen-protected rotary seal explosion-proof heater. This design combines nitrogen protection and rotary sealing, providing not only long-term stable explosion-proof performance but also convenient operation during equipment maintenance. The specific solution is as follows:

[0006] A nitrogen-protected rotary seal explosion-proof heater includes an explosion-proof housing, a heating module, a rotary sealing device, a nitrogen protection module, a control module, and a protection device. The heating module is disposed within the explosion-proof housing and includes a heating element and a heat conduction device. The heating element is electrically heated. The rotary sealing device is disposed within the explosion-proof housing and includes a rotating shaft, a sealing ring, a bearing, and a drive device. The nitrogen protection module communicates with the interior of the explosion-proof housing and includes a nitrogen supply device, a flow control valve, and a positive pressure protection device for continuously supplying nitrogen to the interior of the explosion-proof housing. The system supplies nitrogen gas and maintains the internal nitrogen pressure higher than the external ambient pressure. The control module connects the heating module, the rotary sealing device, and the nitrogen protection module. The control module includes monitoring sensors and an intelligent controller for real-time monitoring and control of heating power, nitrogen flow rate, and sealing status. The protection devices are located inside the explosion-proof enclosure and include over-temperature protection, over-pressure protection, and power failure protection. The nitrogen protection module regulates the nitrogen flow rate through the flow control valve, and the control module controls the operating status of the heating module, rotary sealing device, and nitrogen protection module through the intelligent controller based on data from the monitoring sensors.

[0007] Furthermore, the heat conduction device includes a heat pipe made of oxygen-free copper and heat dissipation fins made of aluminum alloy. The heat pipe has a diameter of 15mm and a length of 500mm. The heat conduction device is in close contact with the heating element through silver-based brazing. The heat dissipation fins are 0.5mm thick, 30mm high, and spaced 2mm apart, evenly distributed on the outer surface of the heat pipe, with a total heat dissipation area greater than 1.5 square meters. The heat pipe is filled with n-octadecane phase change material with a melting point of 58°C, accounting for 80% of the internal volume of the heat pipe. The heat pipe wall is 1mm thick and has a capillary structure with a diameter of 0.5mm inside. Oxygen-free copper has excellent thermal conductivity, which can quickly conduct heat and improve the thermal efficiency of the heating module. At the same time, the high purity of oxygen-free copper reduces the impact of impurities on thermal conductivity, ensuring the stability and reliability of the system.

[0008] The oxygen-free copper heat pipe is tightly brazed with a silver base to ensure efficient heat transfer. The interior is filled with n-octadecane phase change material with a melting point of 58°C, which utilizes its latent heat to achieve stable temperature control and improve the thermal management efficiency of the system. The capillary structure further enhances the heat conduction capacity of the heat pipe, ensuring that heat can be quickly and evenly distributed throughout the heating module.

[0009] Furthermore, the rotary sealing device also includes a five-stage labyrinth sealing structure, which is disposed between the rotating shaft and the explosion-proof housing. Each labyrinth has a gap of 0.1 mm, a depth of 5 mm, and a total length of 50 mm. The five-stage labyrinth sealing structure is made of zirconia ceramic material, and its surface roughness Ra value does not exceed 0.2 μm. Zirconia ceramic has extremely high temperature resistance and excellent corrosion resistance, ensuring that it can maintain excellent sealing performance under high temperature and high pressure environments. Its low coefficient of friction helps to reduce sealing loss and improve the overall efficiency of the equipment. The five-stage labyrinth design effectively prevents nitrogen leakage and external gas intrusion by increasing the sealing path, providing multiple physical barriers and significantly improving sealing performance.

[0010] Furthermore, the drive device is a permanent magnet synchronous variable frequency motor with IP68 protection rating, rated power of 5kW, speed range of 50-3000rpm, and torque accuracy of ±0.1%. Its wide speed range and high torque accuracy enable the heater to accurately control the rotary sealing device, adapt to different process requirements, and improve the adaptability and flexibility of the equipment.

[0011] Furthermore, the nitrogen supply device includes a nitrogen storage tank, a two-stage pressure reducing valve, and a nitrogen purity detector. The nitrogen storage tank has a volume of 2 cubic meters and is made of stainless steel. The pressure reducing accuracy of the two-stage pressure reducing valve is ±0.1 MPa, and the detection accuracy of the nitrogen purity detector is 0.1 ppm.

[0012] Furthermore, the positive pressure protection device includes a pressure sensor and a solenoid valve. When the internal pressure is detected to be 100 Pa lower than the external pressure, it automatically increases the nitrogen supply to maintain a positive pressure of no less than 200 Pa. The overpressure protection device includes a spring-loaded safety relief valve that opens to release pressure when the internal pressure exceeds 1.1 times the maximum working pressure. Through a nitrogen storage tank, two-stage pressure reducing valves, and a high-precision nitrogen purity detector, the stability and purity of the nitrogen supply are ensured. Precise adjustment of the flow control valve ensures that the internal nitrogen pressure remains consistently higher than the external ambient pressure, preventing the entry of oxygen and other harmful gases. The positive pressure protection device, through the linkage of the pressure sensor and the solenoid valve, monitors and adjusts the nitrogen supply in real time to ensure stable internal pressure and improve overall safety.

[0013] Furthermore, the monitoring sensors include a platinum resistance temperature sensor, a pressure sensor, an electrochemical oxygen content sensor, and a piezoelectric vibration sensor. The intelligent controller dynamically adjusts the heating power and nitrogen flow rate based on real-time data from the monitoring sensors, achieving a control accuracy of ±1°C for temperature and ±0.5 kPa for pressure. The integrated monitoring sensors collect equipment operating data in real time, and the intelligent controller uses an adaptive PID algorithm to dynamically adjust the heating power and nitrogen flow rate based on the real-time data, achieving a temperature control accuracy of ±1°C and a pressure control accuracy of ±0.5 kPa. This high-precision control capability not only improves heating efficiency but also ensures the stability and safety of the production process.

[0014] Furthermore, the over-temperature protection device includes a thermal fuse with a rated operating temperature of 150°C and a temperature control circuit using an independent thermocouple. When the temperature exceeds the set threshold of 145°C, the over-temperature protection device automatically cuts off the power supply within 100ms. It also includes a remote monitoring module based on 4G-LTE technology, which is connected to the control module via wireless communication technology. The over-temperature protection device uses a thermal fuse and an independent thermocouple temperature control circuit, which can quickly cut off the power supply when the temperature exceeds the set threshold to prevent safety accidents caused by overheating of the equipment. The overpressure protection device automatically releases pressure exceeding the safe range through a spring-loaded safety relief valve to prevent damage to the equipment due to overpressure. The power failure protection device ensures that the equipment can be safely shut down when the power is interrupted, avoiding potential dangers under abnormal conditions.

[0015] Furthermore, the explosion-proof enclosure is internally coated with a 100μm thick polytetrafluoroethylene (PTFE) anti-corrosion coating; it also includes a self-cleaning device, which uses four evenly distributed high-pressure nitrogen nozzles to spray at a pressure of 0.8MPa and a flow rate of 50Nm³ / h. The self-cleaning device automatically runs for 30 seconds every 8 hours. The PTFE anti-corrosion coating inside the explosion-proof enclosure effectively prevents corrosive media from eroding the equipment and extends its service life. The self-cleaning device periodically sprays high-pressure nitrogen through the nozzles to remove deposits on the surface of the heating module, maintains heat transfer efficiency, reduces maintenance frequency, and improves the equipment's continuous operation capability.

[0016] Furthermore, the control module also includes an energy recovery device, which consists of a thermoelectric power generation module with a thermoelectric conversion efficiency of 8%. This energy recovery device converts excess heat above 80°C into electrical energy, which is then stored in a 12V / 100Ah lithium battery or fed back to the grid via an MPPT controller. The heating module adopts a modular design, with each module measuring 200mm × 150mm × 100mm. Electrical and mechanical connections are achieved through quick-connect interfaces. The control module integrates the energy recovery device, converting excess heat into electrical energy through the thermoelectric conversion module and utilizing the MPPT controller for efficient energy management. This achieves effective energy utilization and feedback, improving overall energy efficiency, reducing operating costs, and making the heating module easy to install, disassemble, and replace. This greatly simplifies the maintenance process, reduces equipment downtime, and improves production efficiency.

[0017] Beneficial effects: The nitrogen protection module continuously supplies high-purity nitrogen to maintain positive internal pressure, preventing oxygen and other flammable gases from entering, which significantly reduces the risk of explosion. At the same time, the introduction of multiple protection devices ensures that the equipment can respond quickly in abnormal situations and ensures operational safety.

[0018] Modular design simplifies the installation, disassembly, and replacement of equipment, reducing the time and labor costs required for maintenance;

[0019] This device does not use an explosion-proof enclosure for sealing, but rather a rotary sealing device, which avoids overall leakage caused by damage to the explosion-proof enclosure and achieves a stronger sealing effect.

[0020] The design of efficient heat transfer devices and the application of phase change materials enable rapid heat transfer and stable temperature control, significantly improving heating efficiency and reducing energy consumption. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the control principle of a protection device for a nitrogen-protected rotary seal explosion-proof heater;

[0022] Figure 2 This is a cross-sectional structural diagram of a nitrogen-protected rotary seal explosion-proof heater;

[0023] Figure 3 yes Figure 2 A magnified view of a section of A;

[0024] In the diagram: 100, explosion-proof housing; 200, heating module; 300, rotary sealing device; 301, rotating shaft; 302, sealing ring; 303, bearing; 304, drive device; 400, nitrogen protection module; 500, control module; 600, protection device. Detailed Implementation

[0025] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0026] Please refer to Figure 1-3 A nitrogen-protected rotary seal explosion-proof heater includes an explosion-proof housing 100, a heating module 200, a rotary sealing device 300, a nitrogen protection module 400, a control module 500, and a protection device 600. The heating module 200 is disposed inside the explosion-proof housing 100 and includes a heating element and a heat conduction device. The heating element is electrically heated. The rotary sealing device 300 is disposed inside the explosion-proof housing 100 and includes a rotating shaft 301, a sealing ring 302, a bearing 303, and a drive device 304. The nitrogen protection module 400 is connected to the interior of the explosion-proof housing 100 and includes a nitrogen supply device, a flow control valve, and a positive pressure protection device 600 for supplying nitrogen to the explosion-proof housing 100. The system continuously supplies nitrogen internally and maintains the internal nitrogen pressure higher than the external ambient pressure. A control module 500 connects to the heating module 200, the rotary sealing device 300, and the nitrogen protection module 400. The control module 500 includes monitoring sensors and an intelligent controller for real-time monitoring and control of heating power, nitrogen flow rate, and sealing status. A protection device 600 is located inside the explosion-proof enclosure 100 and includes an over-temperature protection device 600, an over-pressure protection device 600, and a power failure protection device 600. The nitrogen protection module 400 regulates the nitrogen flow rate via a flow control valve, and the control module 500 controls the operating status of the heating module 200, the rotary sealing device 300, and the nitrogen protection module 400 via the intelligent controller based on data from the monitoring sensors.

[0027] The rotary sealing device 300 employs a five-stage labyrinth seal structure. Its working principle primarily relies on the multiple gaps and grooves within the labyrinth structure. Each stage of the labyrinth seal has a tiny gap of 0.1 mm and a depth of 5 mm. When gas or liquid passes through these narrow gaps and tortuous paths, the flow resistance increases significantly, gradually dispersing and dissipating energy, thereby greatly reducing fluid leakage. This structure effectively prevents external substances from entering and ensures a sealed internal environment.

[0028] The heat conduction device includes a heat pipe made of oxygen-free copper and heat dissipation fins made of aluminum alloy. The heat pipe has a diameter of 15mm and a length of 500mm. The heat conduction device and the heating element are in close contact through silver-based brazing. The heat dissipation fins are 0.5mm thick, 30mm high, and 2mm apart, and are evenly distributed on the outer surface of the heat pipe, with a total heat dissipation area of ​​more than 1.5 square meters. The heat pipe is filled with n-octadecane phase change material with a melting point of 58°C, and the filling ratio is 80% of the internal volume of the heat pipe. The heat pipe wall thickness is 1mm, and the heat pipe has a capillary structure with a diameter of 0.5mm inside.

[0029] The rotary sealing device 300 also includes a five-stage labyrinth sealing structure, which is set between the rotary shaft 301 and the explosion-proof housing 100. The gap between each labyrinth stage is 0.1 mm, the labyrinth depth is 5 mm, and the total length of the labyrinth is 50 mm. The material of the five-stage labyrinth sealing structure is zirconia ceramic material, and the surface roughness Ra value of the five-stage labyrinth sealing structure does not exceed 0.2 μm.

[0030] The drive unit 304 is a permanent magnet synchronous variable frequency motor with IP68 protection rating, rated power of 5kW, speed range of 50-3000rpm, and torque accuracy of ±0.1%.

[0031] The nitrogen supply device includes a nitrogen storage tank, a two-stage pressure reducing valve, and a nitrogen purity detector. The nitrogen storage tank has a volume of 2 cubic meters and is made of stainless steel. The pressure reducing accuracy of the two-stage pressure reducing valve is ±0.1 MPa, and the detection accuracy of the nitrogen purity detector is 0.1 ppm.

[0032] The positive pressure protection device 600 includes a pressure sensor and a solenoid valve. When the internal pressure is detected to be 100 Pa lower than the external pressure, the nitrogen supply is automatically increased to maintain the positive pressure at no less than 200 Pa. The overpressure protection device 600 includes a spring-loaded safety relief valve, which opens to relieve pressure when the internal pressure exceeds 1.1 times the maximum working pressure.

[0033] The monitoring sensors include a platinum resistance temperature sensor, a pressure sensor, an electrochemical oxygen content sensor, and a piezoelectric vibration sensor; the intelligent controller dynamically adjusts the heating power and nitrogen flow rate based on the real-time data from the monitoring sensors, achieving a control accuracy of ±1°C for temperature and ±0.5 kPa for pressure.

[0034] The over-temperature protection device 600 includes a thermal fuse with a rated operating temperature of 150°C and a temperature control circuit using an independent thermocouple. When the temperature exceeds the set threshold of 145°C, the over-temperature protection device 600 automatically cuts off the power supply within 100ms. It also includes a remote monitoring module based on 4G-LTE technology, which is connected to the control module 500 via wireless communication technology.

[0035] The explosion-proof housing 100 has a 100μm thick polytetrafluoroethylene anti-corrosion coating inside; it also includes a self-cleaning device, which uses four evenly distributed high-pressure nitrogen nozzles to spray at a pressure of 0.8MPa and a flow rate of 50Nm³ / h. The self-cleaning device automatically runs for 30 seconds every 8 hours to periodically clean the deposits on the surface of the heating module 200.

[0036] The control module 500 also includes an energy recovery device, which consists of a thermoelectric power generation module with a thermoelectric conversion efficiency of 8%. The energy recovery device can convert excess heat with a temperature above 80°C into electrical energy, which is then stored in a 12V / 100Ah lithium battery or fed back to the grid via an MPPT controller. The heating module 200 adopts a modular design, with each module measuring 200mm×150mm×100mm. Electrical and mechanical connections are achieved through quick-connect interfaces.

[0037] For clarity, the following examples will be used to provide a detailed description.

[0038] The heating module 200 includes a 5kW electric heating element, employing an oxygen-free copper heat pipe and aluminum alloy heat sink fins. The heat pipe has a diameter of 15mm and a length of 500mm, and is internally filled with 80% volume of n-octadecane phase change material. The heat sink fins are 0.5mm thick, 30mm high, and spaced 2mm apart, evenly distributed around the heat pipe, providing a total heat dissipation area of ​​1.5 square meters. The rotary sealing device 300 includes a five-stage labyrinth sealing structure, with each labyrinth having a gap of 0.1mm, a depth of 5mm, and a total length of 50mm. The material is zirconia ceramic with a surface roughness Ra value not exceeding 0.2μm. The rotating shaft 301 is driven by a permanent magnet synchronous frequency conversion motor with a speed range of 50-3000rpm and a torque accuracy of ±0.1%. The nitrogen protection module 400 includes a nitrogen storage tank, a two-stage pressure reducing valve, and a positive pressure protection device 600. The nitrogen storage tank has a volume of 2 cubic meters and maintains an internal pressure 200Pa higher than the external pressure through a flow control valve. The positive pressure protection device 600 monitors the internal pressure in real time through a pressure sensor and automatically adjusts the nitrogen flow rate when the pressure drops. The control module 500 is equipped with a platinum resistance temperature sensor, a pressure sensor, an electrochemical oxygen content sensor, and a piezoelectric vibration sensor for real-time monitoring of the heater's temperature, pressure, and sealing status. Through an intelligent controller, the control module 500 can dynamically adjust the heating power and nitrogen flow rate, achieving a control accuracy of ±1°C for temperature and ±0.5 kPa for pressure. The protection device 600 includes over-temperature protection and over-pressure protection functions. When the internal temperature of the heater exceeds the set threshold of 145°C, the over-temperature protection device 600 will activate the thermal fuse within 100ms. The internal power supply is cut off. At the same time, the overpressure protection device 600 automatically opens to release pressure when the pressure exceeds 1.1 times the maximum working pressure via a spring-loaded safety relief valve. The self-cleaning device sprays nitrogen gas at a pressure of 0.8MPa through a high-pressure nitrogen nozzle, automatically cleaning the surface deposits of the heating module 200 every 8 hours to ensure the stability of the equipment during long-term operation. The energy recovery device uses thermoelectric power generation technology to convert excess heat above 80°C into electrical energy, which is stored in a 12V / 100Ah lithium battery or fed back to the grid, improving energy efficiency.

[0039] The following is an implementation example:

[0040] The explosion-proof heater is fixed to the equipment to be heated by bolts. The heating module 200, electrical connection module, and nitrogen supply pipeline are all installed inside the explosion-proof housing 100 through quick-connect interfaces. After installation, the explosion-proof housing 100 is fixed first, and the system starts the drive device 304. The drive device 304 drives the rotating shaft 301 to rotate, and the rotating shaft 301 drives the sealing ring 302 to rotate. The rotating shaft 301 has a threaded structure. When rotating, the distance between the sealing ring 302 and the explosion-proof housing 100 will increase, and the pressure between the sealing ring 302 and the equipment to be heated will increase. The five-stage labyrinth seal structure on the sealing ring 302 can further enhance the sealing effect. This device does not seal through the explosion-proof housing 100, but through the rotating sealing device 300, which avoids damage to the explosion-proof housing 100 and overall leakage, and achieves a stronger sealing effect.

[0041] Before starting the heater, nitrogen is first introduced into the explosion-proof enclosure 100 through the nitrogen supply module to ensure that the internal oxygen concentration is below 0.1ppm and to maintain a positive pressure. When the pressure sensor detects that the internal pressure is 100Pa lower than the external pressure, the positive pressure protection device 600 automatically increases the nitrogen flow to ensure that the internal pressure is maintained within a safe range of not less than 200Pa.

[0042] When the control module 500 receives the start signal, the electric heating element starts to work. Heat is conducted to the aluminum alloy heat sink fins through the heat pipe for rapid heat dissipation. The storage and release of heat are achieved through the n-octadecane phase change material inside the heat pipe, ensuring that a stable heat output can still be provided in the event of a sudden power outage or load fluctuation.

[0043] The labyrinth seal structure of the rotary sealing device 300 effectively prevents external gases or dust from entering the explosion-proof heater. At the same time, the high wear resistance of the zirconia ceramic material ensures the long-term operation of the sealing device. During the operation of the equipment, the rotation speed of the rotary shaft 301 is controlled by a permanent magnet synchronous frequency conversion motor to ensure high-precision torque control under different working conditions.

[0044] The heater is connected to a remote monitoring system via a built-in 4G-LTE communication module. Users can view the heater's working status in real time via mobile devices or computers and remotely adjust the heating power and nitrogen supply parameters. When the equipment malfunctions, such as when the temperature or pressure exceeds the set range, the over-temperature protection device 600 and the over-pressure protection device 600 will immediately activate to cut off the power or release the pressure to prevent accidents.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A nitrogen-protected rotary seal explosion-proof heater, characterized in that, The device includes an explosion-proof enclosure, a heating module, a rotary sealing device, a nitrogen protection module, a control module, and a protection device. The heating module is located inside the explosion-proof enclosure and includes a heating element and a heat conduction device; the heating element is electrically heated. The rotary sealing device is also located inside the explosion-proof enclosure and includes a rotating shaft, a sealing ring, a bearing, and a drive device. The nitrogen protection module communicates with the interior of the explosion-proof enclosure and includes a nitrogen supply device, a flow control valve, and a positive pressure protection device, used to continuously supply nitrogen to the interior of the explosion-proof enclosure and maintain internal pressure. The nitrogen pressure is higher than the external ambient pressure. The control module connects the heating module, the rotary sealing device, and the nitrogen protection module. The control module includes a monitoring sensor and an intelligent controller for real-time monitoring and control of heating power, nitrogen flow rate, and sealing status. The protection device is located inside the explosion-proof enclosure and includes an over-temperature protection device, an over-pressure protection device, and a power failure protection device. The nitrogen protection module regulates the nitrogen flow rate through the flow control valve, and the control module controls the operating status of the heating module, the rotary sealing device, and the nitrogen protection module through the intelligent controller based on the data from the monitoring sensor.

2. The explosion-proof rotary seal heater based on nitrogen protection according to claim 1, characterized in that... The heat conduction device includes a heat pipe made of oxygen-free copper and heat dissipation fins made of aluminum alloy. The heat pipe has a diameter of 15 mm and a length of 500 mm. The heat conduction device and the heating element are in close contact through silver-based brazing. The heat dissipation fins are 0.5 mm thick, 30 mm high, and 2 mm apart, and are evenly distributed on the outer surface of the heat pipe, with a total heat dissipation area greater than 1.5 square meters. The heat pipe is filled with n-octadecane phase change material with a melting point of 58°C, and the filling ratio is 80% of the internal volume of the heat pipe. The heat pipe wall thickness is 1 mm, and the heat pipe has a capillary structure with a diameter of 0.5 mm inside.

3. The nitrogen-protected rotary seal explosion-proof heater according to claim 1, characterized in that, The rotary sealing device also includes a five-stage labyrinth sealing structure, which is set between the rotating shaft and the explosion-proof shell. The gap between each labyrinth stage is 0.1 mm, the labyrinth depth is 5 mm, and the total length of the labyrinth is 50 mm. The material of the five-stage labyrinth sealing structure is zirconia ceramic material, and the surface roughness Ra value of the five-stage labyrinth sealing structure does not exceed 0.2 μm.

4. The nitrogen-protected rotary seal explosion-proof heater according to claim 1, characterized in that, The drive unit is a permanent magnet synchronous variable frequency motor with IP68 protection rating, rated power of 5kW, speed range of 50-3000rpm, and torque accuracy of ±0.1%.

5. A nitrogen-protected rotary seal explosion-proof heater according to claim 1, characterized in that, The nitrogen supply device includes a nitrogen storage tank, a two-stage pressure reducing valve, and a nitrogen purity detector. The nitrogen storage tank has a volume of 2 cubic meters and is made of stainless steel. The pressure reducing accuracy of the two-stage pressure reducing valve is ±0.1 MPa, and the detection accuracy of the nitrogen purity detector is 0.1 ppm.

6. The nitrogen-protected rotary seal explosion-proof heater according to claim 1, characterized in that, The positive pressure protection device includes a pressure sensor and a solenoid valve. When the internal pressure is detected to be 100 Pa lower than the external pressure, the nitrogen supply is automatically increased to maintain a positive pressure of not less than 200 Pa. The overpressure protection device includes a spring-loaded safety relief valve, which opens to release pressure when the internal pressure exceeds 1.1 times the maximum working pressure.

7. A nitrogen-protected rotary seal explosion-proof heater according to claim 1, characterized in that, The monitoring sensors include a platinum resistance temperature sensor, a pressure sensor, an electrochemical oxygen content sensor, and a piezoelectric vibration sensor; the intelligent controller dynamically adjusts the heating power and nitrogen flow rate based on the real-time data from the monitoring sensors, achieving a control accuracy of ±1°C for temperature and ±0.5 kPa for pressure.

8. A nitrogen-protected rotary seal explosion-proof heater according to claim 1, characterized in that, The over-temperature protection device includes a thermal fuse with a rated operating temperature of 150°C and a temperature control circuit using an independent thermocouple. When the temperature exceeds the set threshold of 145°C, the over-temperature protection device automatically cuts off the power supply within 100ms. It also includes a remote monitoring module based on 4G-LTE technology, which is connected to the control module via wireless communication technology.

9. A nitrogen-protected rotary seal explosion-proof heater according to claim 1, characterized in that, The explosion-proof housing has a 100μm thick polytetrafluoroethylene anti-corrosion coating inside; it also includes a self-cleaning device, which uses four evenly distributed high-pressure nitrogen nozzles to spray at a pressure of 0.8MPa and a flow rate of 50Nm³ / h. The self-cleaning device runs automatically for 30 seconds every 8 hours.

10. A nitrogen-protected rotary seal explosion-proof heater according to claim 1, characterized in that, The control module also includes an energy recovery device, which consists of a thermoelectric power generation module with a thermoelectric conversion efficiency of 8%. The energy recovery device can convert excess heat above 80°C into electrical energy, which is then stored in a 12V / 100Ah lithium battery or fed back to the grid via an MPPT controller. The heating module adopts a modular design, with each module measuring 200mm×150mm×100mm, and electrical and mechanical connections are achieved through quick-connect interfaces.

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