Rotary sealing type anti-explosion heater based on nitrogen protection

Abstract

The invention discloses a rotary sealing type anti-explosion heater based on nitrogen protection, which is composed of an anti-explosion shell, a heating module, a rotary sealing device, a nitrogen protection module, a control module and a protection device, the heating module is located in the anti-explosion shell and adopts an electric heating mode, and the rotary sealing device comprises a rotating shaft, a sealing ring, a bearing and a driving device. Effective sealing is guaranteed when the heater operates, the nitrogen protection module keeps the positive pressure environment higher than the external pressure inside by continuously supplying nitrogen to the inside, external hazardous gas is prevented from entering, and the control module monitors the heating power, the nitrogen flow and the sealing state in real time through an intelligent controller and a sensor. And the protection device provides overtemperature, overvoltage and power-off protection. According to the invention, the long-term stability of the explosion-proof performance can be realized, and the operation is simple and convenient in the maintenance process.

Description

Technical Field

[0001] The invention relates to a rotary sealed explosion-proof heater based on nitrogen protection. Background Art

[0002] Existing explosion-proof heaters are prone to problems such as seal aging, external oxygen infiltration, and equipment overheating when operating in high-risk environments. Especially in flammable and explosive industries such as petroleum and chemical industries, these problems may lead to fire or explosion accidents. Traditional explosion-proof heaters mainly use physical seals and external coatings to prevent explosive gas leakage or ignition by external sparks, but these measures often fail in long-term use, leading to safety hazards. In addition, since the heater operates at high temperatures, the explosion-proof performance will gradually decrease with the aging of the sealing material or changes in environmental pressure, affecting the reliability and service life of the equipment.

[0003] The market is in urgent need of 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 problems of heating equipment in high-risk environments.

[0004] Therefore, those skilled in the art are in urgent need of 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 life of the equipment. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above prior art and provide a rotary sealed explosion-proof heater based on nitrogen protection. The design of combining nitrogen protection and rotary sealing can not only provide long-term stable explosion-proof performance, but also facilitate operation during equipment maintenance. The following is a specific solution:

[0006] A rotary-sealed explosion-proof heater based on nitrogen protection, comprising an explosion-proof housing, a heating module, a rotary sealing device, a nitrogen protection module, a control module and a protection device, wherein the heating module is arranged in the explosion-proof housing, the heating module comprises a heating element and a heat conduction device, and the heating method of the heating element is electric heating; the rotary sealing device is arranged in the explosion-proof housing, the rotary sealing device comprises a rotating shaft, a sealing ring, a bearing and a driving device; the nitrogen protection module is connected to the inside of the explosion-proof housing, the nitrogen protection module comprises a nitrogen supply device, a flow control valve and a positive pressure protection device, and is used to continuously supply nitrogen to the inside of the explosion-proof housing. Nitrogen is supplied, and the internal nitrogen pressure is maintained higher than the external environmental pressure; the control module is connected to the heating module, the rotary sealing device and the nitrogen protection module, and the control module includes a monitoring sensor and an intelligent controller for real-time monitoring and control of the heating power, the nitrogen flow rate and the sealing state; the protection device is arranged inside the explosion-proof housing, and the protection device includes an over-temperature protection device, an over-pressure protection device and a power-off protection device; wherein the nitrogen protection module adjusts the nitrogen flow rate through the flow control valve, and the control module controls the working states of the heating module, the rotary sealing device and the nitrogen protection module through the intelligent controller according to the data of the monitoring sensor.

[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 15 mm and a length of 500 mm. The heat conduction device is in close contact with the heating element through silver-based brazing. The heat dissipation fins are 0.5 mm thick, 30 mm high, and 2 mm apart. They are evenly distributed on the outer surface of the heat pipe, and the total heat dissipation area is greater than 1.5 square meters. The interior of 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 wall thickness of the heat pipe is 1 mm, and the interior of the heat pipe has a capillary structure with a diameter of 0.5 mm. Oxygen-free copper has excellent thermal conductivity and can quickly conduct heat, thereby improving the thermal efficiency of the heating module. At the same time, the high purity of oxygen-free copper reduces the influence of impurities on thermal conductivity, thereby ensuring the stability and reliability of the system.

[0008] The oxygen-free copper heat pipe and the heating element are tightly connected by silver-based brazing to ensure efficient heat transfer. The interior is filled with n-octadecane phase change material with a melting point of 58°C, and its latent heat is used to achieve stable temperature control, thereby improving the thermal management efficiency of the system. The capillary structure further enhances the thermal conductivity of the heat pipe, ensuring that heat can be quickly and evenly distributed to the entire heating module.

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

[0010] Furthermore, the drive device is a permanent magnet synchronous variable frequency motor with IP68 protection grade, 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 rotating 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 volume of the nitrogen storage tank is 2 cubic meters, the material of the nitrogen storage tank is stainless steel, the pressure reduction accuracy of the two-stage pressure reducing valve is ±0.1MPa, and the detection accuracy of the nitrogen purity detector is 0.1ppm.

[0012] Furthermore, the positive pressure protection device includes a pressure sensor and a solenoid valve. When it is detected that the internal pressure is 100Pa lower than the external pressure, the nitrogen supply is automatically increased to maintain a positive pressure of not less than 200Pa; the overpressure protection device includes a spring-loaded safety pressure relief valve, which opens to relieve pressure when the internal pressure exceeds 1.1 times the maximum working pressure; the stability and purity of the nitrogen supply are ensured by a nitrogen storage tank, a two-stage pressure reducing valve and a high-precision nitrogen purity detector. The precise adjustment of the flow control valve ensures that the internal nitrogen pressure is continuously higher than the external environmental pressure to prevent oxygen and other harmful gases from entering. The positive pressure protection device monitors and adjusts the nitrogen supply in real time through the linkage of the pressure sensor and the solenoid valve to ensure the stability of the internal pressure and improve overall safety.

[0013] Furthermore, the monitoring sensors include platinum resistance temperature sensors, pressure sensors, electrochemical oxygen content sensors and piezoelectric vibration sensors; the intelligent controller dynamically adjusts the heating power and nitrogen flow rate according to the real-time data of the monitoring sensors, and the control accuracy reaches temperature ±1°C and pressure ±0.5kPa; the integrated monitoring sensors collect equipment operation data in real time, and the intelligent controller adopts an adaptive PID algorithm to dynamically adjust the heating power and nitrogen flow rate according to the real-time data to achieve temperature control accuracy of ±1°C and pressure control accuracy of ±0.5kPa. This high-precision control capability not only improves the 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 through 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 over-pressure protection device automatically releases the pressure beyond the safety range through a spring-loaded safety relief valve to prevent the equipment from being damaged due to overpressure. The power-off protection device ensures that the equipment can be safely shut down when the power is interrupted to avoid potential dangers in abnormal conditions.

[0015] Furthermore, the explosion-proof housing is provided with a polytetrafluoroethylene anti-corrosion coating with a thickness of 100 μm; and also includes a self-cleaning device, which uses 4 evenly distributed high-pressure nitrogen nozzles with a spray pressure of 0.8 MPa and a flow rate of 50 Nm 3 / h, the self-cleaning device automatically runs for 30 seconds every 8 hours; the PTFE anti-corrosion coating inside the explosion-proof housing effectively prevents the erosion of the equipment by corrosive media and extends the service life of the equipment; the self-cleaning device regularly sprays through a high-pressure nitrogen nozzle to remove deposits on the surface of the heating module, maintain heat conduction efficiency, reduce maintenance frequency, and improve the continuous operation capability of the equipment.

[0016] Furthermore, the control module also includes an energy recovery device, which is composed of a temperature difference power generation module with a thermoelectric conversion efficiency of 8%. The energy recovery device can convert excess heat with a temperature higher than 80°C into electrical energy, and store the electrical energy in a 12V / 100Ah lithium battery or feed it back to the power grid through an MPPT controller; the heating module adopts a modular design, and the size of a single module is 200mm×150mm×100mm, and electrical and mechanical connections are achieved through a quick connection interface; the control module integrates an energy recovery device, converts excess heat into electrical energy through a thermoelectric conversion module, and uses an MPPT controller for efficient energy management to achieve effective utilization and feedback of energy, thereby improving overall energy utilization efficiency and reducing operating costs. The modular design makes the heating module easy to install, disassemble and replace, 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 internal positive pressure, preventing oxygen and other flammable gases from entering, significantly reducing 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 safe operation.

[0018] The modular design makes the installation, removal and replacement of equipment easy, reducing the time and labor costs required for maintenance;

[0019] This device is not sealed by an explosion-proof housing, but by a rotary sealing device, which avoids overall leakage caused by damage to the explosion-proof housing and achieves a stronger sealing effect;

[0020] The efficient heat conduction device design and the application of phase change materials realize rapid heat transfer and stable temperature control, which significantly improves heating efficiency and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the control principle of a protective device for a rotary sealed explosion-proof heater based on nitrogen protection;

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of a rotary sealed explosion-proof heater based on nitrogen protection;

[0023] Figure 3 yes Figure 2 A partial perspective enlarged view of the middle A;

[0024] In the figure: 100, explosion-proof housing, 200, heating module, 300, rotary sealing device, 301, rotating shaft, 302, sealing ring, 303, bearing, 304, driving device, 400, nitrogen protection module, 500, control module, 600, protection device. DETAILED DESCRIPTION

[0025] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0026] Please see Figure 1-3 A rotary-sealed explosion-proof heater based on nitrogen protection comprises 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 arranged in the explosion-proof housing 100, and the heating module 200 comprises a heating element and a heat conduction device, and the heating method of the heating element is electric heating; the rotary sealing device 300 is arranged in the explosion-proof housing 100, and the rotary sealing device 300 comprises a rotating shaft 301, a sealing ring 302, a bearing 303 and a driving device 304; the nitrogen protection module 400 is connected to the inside of the explosion-proof housing 100, and the nitrogen protection module 400 comprises a nitrogen supply device, a flow control valve and a positive pressure protection device 600, which is used to supply nitrogen to the explosion-proof housing 100. Nitrogen is continuously supplied internally, and the internal nitrogen pressure is maintained higher than the external environmental pressure; the control module 500 is connected to the heating module 200, the rotary sealing device 300 and the nitrogen protection module 400, and the control module 500 includes a monitoring sensor and an intelligent controller for real-time monitoring and control of the heating power, nitrogen flow rate and sealing status; the protection device 600 is arranged inside the explosion-proof housing 100, and the protection device 600 includes an over-temperature protection device 600, an over-pressure protection device 600 and a power-off protection device 600; wherein, the nitrogen protection module 400 adjusts the nitrogen flow rate through a flow control valve, and the control module 500 controls the working status of the heating module 200, the rotary sealing device 300 and the nitrogen protection module 400 through the intelligent controller according to the data of the monitoring sensor.

[0027] The rotary sealing device 300 adopts a five-level labyrinth seal structure, and its working principle mainly relies on the multiple gaps and grooves in the labyrinth structure. Each level of the labyrinth seal has a tiny gap of 0.1mm and a depth of 5mm. When gas or liquid passes through these narrow gaps and curved paths, the flow resistance is greatly increased, and the energy is gradually dispersed and dissipated, thereby greatly reducing the leakage of the fluid. This structure can effectively prevent foreign substances from entering and ensure the internal closed 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 15 mm and a length of 500 mm. The heat conduction device is in close contact with the heating element through silver-based brazing. The heat dissipation fins are 0.5 mm thick, 30 mm high, and 2 mm apart. They are evenly distributed on the outer surface of the heat pipe, and the total heat dissipation area is greater than 1.5 square meters. The interior of 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 wall thickness of the heat pipe is 1 mm, and the interior of the heat pipe has a capillary structure with a diameter of 0.5 mm.

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

[0030] The driving device 304 is a permanent magnet synchronous variable frequency motor with IP68 protection level, a rated power of 5 kW, a speed range of 50-3000 rpm, and a 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 volume of the nitrogen storage tank is 2 cubic meters. The material of the nitrogen storage tank is stainless steel. The pressure reduction accuracy of the two-stage pressure reducing valve is ±0.1MPa, and the detection accuracy of the nitrogen purity detector is 0.1ppm.

[0032] The positive pressure protection device 600 includes a pressure sensor and a solenoid valve. When it detects that the internal pressure is 100Pa lower than the external pressure, it automatically increases the nitrogen supply to maintain the positive pressure not less than 200Pa. The overpressure protection device 600 includes a spring-loaded safety pressure relief valve, which opens to relieve pressure when the internal pressure exceeds 1.1 times the maximum working pressure.

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

[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 through wireless communication technology.

[0035] The explosion-proof housing 100 is provided with a polytetrafluoroethylene anti-corrosion coating with a thickness of 100 μm; it also includes a self-cleaning device, which uses 4 evenly distributed high-pressure nitrogen nozzles with a spray pressure of 0.8 MPa and a flow rate of 50 Nm 3 / h, the self-cleaning device automatically runs for 30 seconds every 8 hours to regularly clean the deposits on the surface of the heating module 200.

[0036] The control module 500 also includes an energy recovery device, which is composed of a temperature difference power generation module with a thermoelectric conversion efficiency of 8%. The energy recovery device can convert excess heat with a temperature higher than 80°C into electrical energy, and store the electrical energy in a 12V / 100Ah lithium battery or feed it back to the power grid through an MPPT controller; the heating module 200 adopts a modular design, with a single module size of 200mm×150mm×100mm, and electrical and mechanical connections are achieved through a quick connection interface.

[0037] For the purpose of greater clarity, the invention is described in detail through the following examples.

[0038] The heating module 200 includes an electric heating element with a power of 5kW, a heat pipe made of oxygen-free copper and an aluminum alloy heat sink fin design, the heat pipe has a diameter of 15mm and a length of 500mm, and is filled with 80% volume of n-octadecane phase change material. The heat sink fins are 0.5mm thick, 30mm high, and 2mm apart, evenly distributed outside the heat pipe, with a total heat dissipation area of ​​1.5 square meters; the rotary sealing device 300 includes a five-level labyrinth sealing structure, with a gap of 0.1mm and a depth of 5mm at each level, and a total length of 50mm. The material is zirconia ceramic, the surface roughness Ra value does not exceed 0.2μm, the rotating shaft 301 is driven by a permanent magnet synchronous variable frequency motor, the speed range is 50-3000rpm, and the torque accuracy is ±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 volume of the nitrogen storage tank is 2 cubic meters. The internal pressure is maintained 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 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 temperature, pressure and sealing status of the heater. Through the intelligent controller, the control module 500 can dynamically adjust the heating power and nitrogen flow rate, and the control accuracy reaches ±1°C for temperature and ±0.5kPa 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 cut off the power supply within 100ms through the thermal fuse. At the same time, the over-pressure protection device 600 automatically opens the pressure relief valve through the spring-loaded safety relief valve when the pressure exceeds 1.1 times the maximum working pressure. The self-cleaning device sprays nitrogen at a pressure of 0.8MPa through a high-pressure nitrogen nozzle, and automatically cleans the surface deposits of the heating module 200 every 8 hours to ensure the stability of the equipment for long-term operation. The energy recovery device uses temperature difference 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 power grid to improve 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, the electrical connection module and the nitrogen supply pipeline are all installed in the explosion-proof housing 100 through the quick connection interface. After the installation is completed, the explosion-proof housing 100 is fixed first, and the system starts the driving device 304. The driving 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 sealing ring 302 will be farther and farther away from the explosion-proof housing 100, so that the pressure between the sealing ring 302 and the equipment to be heated is increasing, and the five-level labyrinth sealing structure on the sealing ring 302 can further enhance the sealing effect. The device is not sealed by the explosion-proof housing 100, but is sealed by the rotating sealing device 300, which avoids the overall leakage caused by damage to the explosion-proof housing 100 and has a stronger sealing effect.

[0041] Before starting the heater, nitrogen is first filled into the explosion-proof enclosure 100 through the nitrogen supply module to ensure that the internal oxygen concentration is lower than 0.1ppm and maintain a positive pressure state. 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 rate 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 working, and the heat is transferred to the aluminum alloy heat sink fins through the heat pipe to quickly dissipate the heat. The heat is stored and released through the n-octadecane phase change material inside the heat pipe, ensuring that stable heat output can still be provided in the event of a sudden power outage or load fluctuation.

[0043] The labyrinth sealing structure of the rotating sealing device 300 effectively prevents external gas or dust from entering the interior of 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 speed of the rotating shaft 301 is controlled by a permanent magnet synchronous variable frequency motor to ensure high-precision torque control under different working conditions.

[0044] The heater is connected to the remote monitoring system through the built-in 4G-LTE communication module. The user can view the working status of the heater in real time through a mobile device or computer, and remotely adjust the heating power and nitrogen supply parameters; when the equipment has an abnormal situation, such as the temperature or pressure exceeds the set range, the over-temperature protection device 600 and the over-pressure protection device 600 will be activated immediately to cut off the power supply or release the pressure to prevent accidents.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A rotary sealed explosion-proof heater based on nitrogen protection, characterized in that: The invention comprises an explosion-proof housing, a heating module, a rotary sealing device, a nitrogen protection module, a control module and a protection device, wherein the heating module is arranged in the explosion-proof housing, the heating module comprises a heating element and a heat conduction device, and the heating method of the heating element is electric heating; the rotary sealing device is arranged in the explosion-proof housing, the rotary sealing device comprises a rotating shaft, a sealing ring, a bearing and a driving device; the nitrogen protection module is communicated with the interior of the explosion-proof housing, the nitrogen protection module comprises a nitrogen supply device, a flow control valve and a positive pressure protection device, which is used to continuously supply nitrogen to the interior of the explosion-proof housing and maintain the internal pressure. The nitrogen pressure is higher than the external environment pressure; the control module is connected to the heating module, the rotary sealing device and the nitrogen protection module, and the control module includes a monitoring sensor and an intelligent controller for real-time monitoring and control of the heating power, the nitrogen flow rate and the sealing state; the protection device is arranged inside the explosion-proof housing, and the protection device includes an over-temperature protection device, an over-pressure protection device and a power-off protection device; wherein, the nitrogen protection module adjusts the nitrogen flow rate through the flow control valve, and the control module controls the working states of the heating module, the rotary sealing device and the nitrogen protection module through the intelligent controller according to the data of the monitoring sensor.

2. A rotary sealed explosion-proof 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 a heat dissipation fin made of aluminum alloy. The heat pipe has a diameter of 15 mm and a length of 500 mm. The heat conduction device is in close contact with the heating element through silver-based brazing. The heat dissipation fins are 0.5 mm thick, 30 mm high, and 2 mm apart. They are evenly distributed on the outer surface of the heat pipe, and the total heat dissipation area is 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 wall thickness of the heat pipe is 1 mm, and the heat pipe has a capillary structure with a diameter of 0.5 mm.

3. A rotary sealed explosion-proof heater based on nitrogen protection according to claim 1, characterized in that: The rotary sealing device also includes a five-level labyrinth sealing structure, which is arranged between the rotating shaft and the explosion-proof casing. The gap of each level of the labyrinth is 0.1mm, the labyrinth depth is 5mm, and the total length of the labyrinth is 50mm; the material of the multi-level labyrinth sealing structure is zirconia ceramic material, and the surface roughness Ra value of the multi-level labyrinth sealing structure does not exceed 0.2μm.

4. A rotary sealed explosion-proof heater based on nitrogen protection according to claim 1, characterized in that: The driving device is a permanent magnet synchronous variable frequency motor with IP68 protection level, a rated power of 5kW, a speed range of 50-3000rpm, and a torque accuracy of ±0.1%.

5. The rotary sealed explosion-proof heater based on nitrogen protection 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 volume of the nitrogen storage tank is 2 cubic meters. The material of the nitrogen storage tank is stainless steel. The pressure reduction accuracy of the two-stage pressure reducing valve is ±0.1MPa, and the detection accuracy of the nitrogen purity detector is 0.1ppm.

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

7. The rotary sealed explosion-proof heater based on nitrogen protection 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 according to the real-time data of the monitoring sensors, and the control accuracy reaches ±1°C for temperature and ±0.5kPa for pressure.

8. The rotary sealed explosion-proof heater based on nitrogen protection 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 through wireless communication technology.

9. The nitrogen-protected rotary-sealed explosion-proof heater according to claim 1, characterized in that: The explosion-proof housing is provided with a 100 μm thick polytetrafluoroethylene anti-corrosion coating; it also includes a self-cleaning device, which uses 4 evenly distributed high-pressure nitrogen nozzles with a spray pressure of 0.8 MPa and a flow rate of 50 Nm 3 / h, the self-cleaning device automatically runs for 30 seconds every 8 hours.

10. The nitrogen-protected rotary-sealed explosion-proof heater according to claim 1, characterized in that: The control module also includes an energy recovery device, which consists of a temperature difference power generation module with a thermoelectric conversion efficiency of 8%. The energy recovery device can convert excess heat with a temperature higher than 80°C into electrical energy, and store the electrical energy in a 12V / 100Ah lithium battery or feed it back to the power grid through an MPPT controller; the heating module adopts a modular design, with a single module size of 200mm×150mm×100mm, and electrical and mechanical connections are achieved through a quick connection interface.

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