Membrane group temperature protection system of underground coal mine membrane separation nitrogen generation device

Abstract

The utility model discloses a membrane module temperature protection system of an underground coal mine membrane separation nitrogen-making device, which comprises a vehicle body, an electric heater and a nitrogen-making system, the electric heater is connected with the nitrogen-making system, and the electric heater comprises a container cavity, a first explosion-proof cavity, a second explosion-proof cavity, a wiring cavity and an electric heating device. The container cavity, the first explosion-proof cavity, the second explosion-proof cavity and the wiring cavity are sequentially assembled and connected through flanges from bottom to top, the electric heating device is assembled in the container cavity, the structure of the electric heater is designed, the heat exchange efficiency can be effectively improved, the energy consumption is reduced, when a nitrogen making system is started, the electric control box collects temperature signals of the membrane front sensor, and the temperature signals of the membrane front sensor are acquired. The temperature of gas in a pipeline in front of a film is monitored in real time, meanwhile, an electric heater is controlled through a PID temperature control module, the temperature of gas at a gas outlet pipe of the electric heater is automatically adjusted to 55 DEG C controlled by a system, and precise temperature control is conducted on compressed air entering the film so that the purposes of protecting the film set and efficiently generating nitrogen can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine underground fire prevention and extinguishing equipment, and particularly provides a membrane group temperature protection system for a membrane separation nitrogen generation device in coal mines underground. Background Technique

[0002] A nitrogen generation device refers to a device that uses air as a raw material and separates oxygen and nitrogen therein by physical methods to obtain nitrogen.

[0003] The common gas source components of a membrane separation nitrogen generation device are composed of an air compressor and heat exchange equipment. Due to the physical property limitations of the hollow fiber membrane of the membrane separation nitrogen generator, the gas temperature entering the membrane group needs to be constant at 55 °C to reach the best working state. If the temperature of the compressed air output by a conventional air compressor is too low after passing through the pipeline system of the nitrogen generator and entering the membrane group, it will lead to a decrease in the gas permeation rate of the membrane group, insufficient gas separation, resulting in a reduction in the nitrogen production of the equipment. If the temperature of the gas entering the membrane group is too high, it will damage the structure of the membrane material, affect the service life of the separation membrane, and even damage the membrane group. The hollow fiber membrane group on the market is expensive, and the maintenance and replacement costs are high, which will cause unnecessary economic losses to mining enterprises. Therefore, the precise temperature control of the inlet gas is a decisive factor to ensure the efficient operation of the membrane nitrogen generation equipment.

[0004] At present, the common temperature control of underground nitrogen generators on the market is temperature control by a spiral plate heat exchanger. The spiral plate heat exchanger uses the waste heat of the air compressor to mix with cold air to regulate the appropriate temperature to heat the inlet gas. The heating speed is slow, the adjustment accuracy is not high, the inlet membrane temperature is unstable, and temperature deviation is likely to occur. Moreover, the spiral plate heat exchanger occupies a large area, and at the same time, the number of pipe fittings increases, the pipeline is complex, increasing the failure rate of the nitrogen generator, and thus affecting the effective progress of nitrogen generation work.

[0005] When an electric heater is applied in an explosive hazardous environment in coal mines underground, high temperature and electric arcs will be generated during operation. Once the concentration of the flammable mixture in the environment reaches the explosion limit range, it will cause the surrounding environment to explode.

[0006] Therefore, a membrane group temperature protection system for a membrane separation nitrogen generation device in coal mines underground and an electric heater with multi-stage explosion protection are needed to precisely control the temperature of the inlet gas and make the nitrogen generation equipment operate efficiently and reliably. Content of the Utility Model

[0007] To solve the above problems, the utility model provides a membrane group temperature protection system for a membrane separation nitrogen generation device in coal mines underground.

[0008] To achieve the above purpose, the technical solution adopted by the utility model is: a membrane group temperature protection system for a membrane separation nitrogen generation device in coal mines underground, including a vehicle body, an electric heater and a nitrogen generation system, and the electric heater and the nitrogen generation system are both assembled on the vehicle body, and the electric heater is connected to the nitrogen generation system.

[0009] The electric heater includes a container cavity, a first flameproof cavity, a second flameproof cavity, a wiring cavity, and an electric heating device. The container cavity, the first flameproof cavity, the second flameproof cavity, and the wiring cavity are sequentially assembled and connected by flanges from bottom to top, and the electric heating device is assembled in the container cavity.

[0010] The container cavity includes a housing, a probe protection tube, a probe protection head, a baffle plate, and a metal sleeve. The first flameproof cavity includes a temperature protection sleeve, a cold-end protection sleeve, a heating tube fixing sleeve, and a central temperature transmitter. The second flameproof cavity includes a cylinder body. The wiring cavity includes a wiring cavity tube, an A1 connecting joint, an A5 connecting joint, and a wiring terminal. The electric heating device includes an electric heating tube, an electric heating tube wiring terminal, and an insulating bead.

[0011] A plurality of the baffle plates are assembled in the inner cavity of the housing in a staggered manner from top to bottom and left to right. A plurality of the metal sleeves are vertically assembled in the housing, and the upper ends of the metal sleeves are respectively connected to the cold-end protection sleeves. The heating tube fixing sleeve is assembled at the upper end of the cold-end protection sleeve, and the electric heating tube is placed inside the cold-end protection sleeve and the metal sleeve. The probe protection tube is assembled inside the housing, and the probe protection head is fixedly installed at the lower end of the probe protection tube. The temperature protection sleeve is assembled between the housing and the cylinder body. The central temperature transmitter is assembled inside the probe protection tube and the temperature protection sleeve, and the lower end of the central temperature transmitter is located inside the probe protection head. The wiring cavity tube is assembled at the upper end of the cylinder body, and the wiring terminal is assembled inside the wiring cavity tube. The A1 connecting joint and the A5 connecting joint are respectively assembled on the side surface of the wiring cavity tube. The electric heating tube wiring terminal and the insulating bead are fixedly installed at the upper end of the electric heating tube. A plurality of the wiring terminals are respectively electrically connected to the central temperature transmitter, the electric heating tube wiring terminal, the A1 connecting joint, and the A5 connecting joint.

[0012] Further, a sewage outlet is provided at the lower end of the housing. A housing support seat and an air outlet pipe are assembled on the lower side of the outer wall of the housing, and the housing support seat is welded to the vehicle body. An air inlet pipe is assembled on the upper side of the outer wall of the housing.

[0013] Further, round holes are evenly formed on the surface of the baffle plate, and the metal sleeve is assembled in the round holes. The metal sleeve and the electric heating tube are threaded tubes that match each other.

[0014] Further, an insulating sleeve is assembled on the inner side of the upper end of the heating tube fixing sleeve, and the electric heating tube is located inside the insulating sleeve.

[0015] Further, a wiring cavity partition plate and a wiring cavity upper cover are respectively fixedly installed at the lower end and the upper end of the wiring cavity tube. The wiring cavity is assembled at the upper end of the cylinder body through the wiring cavity partition plate.

[0016] Furthermore, the outer shell, the first flameproof chamber, and the second flameproof chamber are all connected by flanges.

[0017] Furthermore, the A1 connecting section is electrically connected to the central temperature transmitter through a communication line for transmitting the signal of the central temperature transmitter, and a cable line is installed in the A5 connecting section for supplying power to the electric heater.

[0018] Furthermore, the nitrogen generation system includes a gas-liquid separator, a three-stage precision filter, an activated carbon fiber filter, a gas collecting pipe, and a membrane module, and the gas-liquid separator, the three-stage precision filter, the activated carbon fiber filter, the electric heater, the gas collecting pipe, and the membrane module are connected in sequence.

[0019] Furthermore, it also includes a cooler and a pre-membrane sensor. The input end of the cooler is connected to the external gas source system through a pipeline, and the output end of the cooler is connected to the gas-liquid separator through a pipeline. The pre-membrane sensor is assembled on the outlet pipe of the electric heater.

[0020] Furthermore, it also includes an electric control box which is fixedly installed on the vehicle body. The electric control box includes an electric heater control unit, a PID temperature control module, and an analog output module. The electric heater control unit is assembled on the electric heater. The PID temperature control module is connected to the pre-membrane sensor, and the analog output module is connected to the electric heater control unit.

[0021] The beneficial effects of using the present utility model are as follows:

[0022] When the nitrogen generation system of the present utility model is started, the electric control box collects the temperature signal of the pre-membrane sensor to monitor the temperature of the gas in the pre-membrane pipeline in real time. At the same time, the electric heater is controlled through the PID temperature control module to automatically adjust the gas temperature at its outlet pipe to 55°C controlled by the system, so as to precisely control the temperature of the compressed air entering the membrane to achieve the purpose of protecting the membrane module and efficiently producing nitrogen.

[0023] In the present utility model, the electric heater is designed as a multi-stage flameproof increased safety type, and the electric heating tube is designed with a non-heating part of 200 mm at the end. A cold end protection sleeve and a metal sleeve are designed outside the electric heating tube, which can effectively eliminate the possibility of explosion transmission caused by the continuous increase of the surface temperature of the electric heating tube and ensure its safety.

[0024] The present utility model designs the structure of the electric heater, and at the same time, both the electric heating tube and the metal sleeve are designed as threaded tubes with textured surfaces, which can effectively improve the heat exchange efficiency and reduce energy consumption. Description of the Drawings

[0025] Figure 1 It is a three-dimensional schematic diagram of the electric heater of the present utility model.

[0026] Figure 2This is a schematic diagram of the connection relationship of the membrane group temperature protection system of the membrane separation nitrogen generation device underground in the mine of the present utility model.

[0027] Figure 3 This is a schematic structural diagram of the electric heater of the present utility model.

[0028] Figure 4 This is a schematic structural diagram of the electric heating tube of the present utility model.

[0029] Figure 5 This is a control system diagram of the present utility model.

[0030] The reference numerals include: 1, electric heater; 11, container cavity; 111, outer shell; 112, sewage outlet; 113, outer shell support seat; 114, outlet pipe; 115, inlet pipe; 116, probe protection tube; 117, probe protection head; 118, baffle plate; 119, metal sleeve; 12, first flameproof cavity; 121, temperature protection sleeve; 122, cold end protection sleeve; 123, heating tube fixing sleeve; 124, central temperature transmitter; 125, insulating sleeve; 13, second flameproof cavity; 131, cylinder body; 14, wiring cavity; 141, wiring cavity partition; 142, wiring cavity pipe; 143, wiring cavity upper cover; 144, A1 connecting joint; 145, A5 connecting joint; 146, internal earthing post; 15, electric heating device; 151, electric heating tube; 152, electric heating tube terminal; 153, insulating bead; 2, cooler; 3, pre-membrane sensor; 4, electric control box; 5, gas-liquid separator; 6, three-stage precision filter; 7, activated carbon fiber filter; 8, gas collecting pipe; 9, membrane group. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] Refer to Figures 1 to 4 , a membrane group temperature protection system of a membrane separation nitrogen generation device underground in a coal mine, including a vehicle body, an electric heater 1, and a nitrogen generation system, and the electric heater 1 and the nitrogen generation system are both assembled on the vehicle body, and the electric heater 1 is connected to the nitrogen generation system.

[0033] The electric heater 1 includes a container cavity 11, a first flameproof cavity 12, a second flameproof cavity 13, a wiring cavity 14, and an electric heating device 15, and the container cavity 11, the first flameproof cavity 12, the second flameproof cavity 13, and the wiring cavity 14 are sequentially assembled and connected by flanges from bottom to top, and the electric heating device 15 is assembled in the container cavity 11.

[0034] The electric heater 1 is designed with two flameproof cavities, namely the first flameproof cavity 12 and the second flameproof cavity 13, which isolate the possible ignition sources, prevent the explosive mixture outside the shell 111 from exploding, and can withstand the explosion pressure of the internal explosive gas mixture, being able to resist explosion and prevent the transmission of explosion.

[0035] The container cavity 11 includes a shell 111, a probe protection tube 116, a probe protection head 117, a baffle plate 118 and a metal sleeve 119. The first flameproof cavity 12 includes a temperature protection sleeve 121, a cold-end protection sleeve 122, a heating tube fixing sleeve 123 and a central temperature transmitter 124. The second flameproof cavity 13 includes a cylinder body 131. The wiring cavity 14 includes a wiring cavity tube 142, an A1 connecting joint 144, an A5 connecting joint 145 and wiring terminals. The electric heating device 15 includes an electric heating tube 151, an electric heating tube wiring terminal 152 and an insulating bead 153.

[0036] A plurality of baffle plates 118 are assembled in a staggered manner from top to bottom and left to right in the inner cavity of the shell 111. A plurality of metal sleeves 119 are vertically assembled in the shell 111, and the upper ends of the metal sleeves 119 are respectively connected to the cold-end protection sleeves 122 in a one-to-one correspondence. The heating tube fixing sleeve 123 is assembled at the upper end of the cold-end protection sleeve 122, and the electric heating tube 151 is placed inside the cold-end protection sleeve 122 and the metal sleeve 119. The probe protection tube 116 is assembled inside the shell 111, and the probe protection head 117 is fixedly installed at the lower end of the probe protection tube 116. The temperature protection sleeve 121 is assembled between the shell 111 and the cylinder body 131. The central temperature transmitter 124 is assembled inside the probe protection tube 116 and the temperature protection sleeve 121, and the lower end of the central temperature transmitter 124 is located inside the probe protection head 117. The wiring cavity tube 142 is assembled at the upper end of the cylinder body 131, and the wiring terminals are assembled inside the wiring cavity tube 142. The A1 connecting joint 144 and the A5 connecting joint 145 are respectively assembled on the side surface of the wiring cavity tube 142. The electric heating tube wiring terminal 152 and the insulating bead 153 are fixedly installed at the upper end of the electric heating tube 151. A plurality of wiring terminals are electrically connected to the central temperature transmitter 124, the electric heating tube wiring terminal 152, the A1 connecting joint 144 and the A5 connecting joint 145 respectively.

[0037] The inner surface of the shell of the electric heater 1 is sprayed with 1320 arc paint, and there shall be no paint on the flameproof surface. After the shell of the electric heater 1 is welded, it needs to be subjected to a water pressure test with a pressure of 1 MPa for 10 s. There should be no continuous dripping phenomenon, and the shell should have no structural damage or permanent deformation that affects the flameproof performance, playing the role of flameproof and explosion resistance.

[0038] An external grounding post is provided on the outer wall of the shell 111 for connecting an external grounding device.

[0039] The probe protection tube 116 and the probe protection head 117 play a role in protecting and explosion-proofing the central temperature transmitter 124.

[0040] The staggered assembly of the baffle plates 118 can make the gas heating uniform, improve the heat exchange efficiency, reduce the energy consumption, and the baffle plates 118 have a simple structure and are convenient to install.

[0041] The temperature protection sleeve 121 is located at the middle position of the first explosion-proof chamber 12, and the temperature protection sleeve 121 is perpendicular to the upper and lower flanges of the first explosion-proof chamber 12 respectively. The cold-end protection sleeve 122 and the heating tube fixing sleeve 123 are parallel to the temperature protection sleeve 121.

[0042] The central temperature transmitter 124 is used to measure the temperature of the compressed gas in the container chamber 11. When the temperature control system fails and the temperature measured by the central temperature transmitter 124 exceeds 150 °C, the electric control box 4 controls the external gas source to automatically cut off the power, stop the gas supply and stop the machine.

[0043] The upper end part of the electric heating tube 151 is designed with a non-heating part of 200 mm, which is located inside the cold-end protection sleeve 122, which can ensure that the high temperature of the electric heating tube 151 will not be transmitted to the electric heating tube terminal 152, and avoid the possibility of detonating the gas in the chamber due to the too high temperature of the electric heating tube terminal 152; the other parts of the electric heating tube 151 are located inside the metal sleeve 119, which can avoid the possibility of explosion transmission when the surface temperature of the electric heating tube 151 continues to rise and encounters condensed water, and increase the safety.

[0044] The nickel-chromium electrothermal alloy wires are evenly distributed along the central axis inside the electric heating tube 151, and the gaps are filled and compacted with magnesia sand with good insulation and heat conduction performance, which can improve the heating efficiency and make the heat generation uniform. When there is current passing through the nickel-chromium electrothermal alloy wires, the electrical energy is converted into heat energy, diffuses to the surface of the metal sleeve 119 through the magnesia sand, and then is transmitted to the heated air to achieve the purpose of heating.

[0045] The electric heating tube terminal 152 is welded to the nickel-chromium electrothermal alloy wire and then inserted into the electric heating tube 151, and the end of the electric heating tube 151 is sealed with sealant and insulating beads 153.

[0046] The insulating beads 153 are made of ceramic, and the sealant is 704 high-temperature resistant insulating glue.

[0047] The design pressure of the electric heater 1 is 1.6 MPa, the power is 25 Kw, and the overall protection level of the machine is IP54.

[0048] Specifically, as Figure 1 shown, a sewage outlet 112 is provided at the lower end of the outer shell 111. The lower side of the outer wall of the outer shell 111 is equipped with an outer shell support seat 113 and an air outlet pipe 114, and the outer shell support seat 113 is welded to the vehicle body. The upper side of the outer wall of the outer shell 111 is equipped with an air inlet pipe 115.

[0049] The drain port 112 is used for discharging condensate water.

[0050] Specifically, round holes are evenly formed on the surface of the partition plate 118, and the metal sleeve 119 is assembled in the round holes. The metal sleeve 119 and the electric heating tube 151 are threaded tubes that match each other.

[0051] The threaded tube adopts a stainless steel 304 threaded tube.

[0052] Textures are designed on the threaded tube surfaces of the metal sleeve 119 and the electric heating tube 151. The heat exchange area is increased through the textures, and the metal sleeve 119 and the electric heating tube 151 can also be strengthened.

[0053] Specifically, as Figure 3 shown, an insulating sleeve 125 is assembled on the inner side of the upper end of the heating tube fixing sleeve 123, and the electric heating tube 151 is located inside the insulating sleeve 125.

[0054] Specifically, as Figure 3 shown, a wiring cavity partition plate 141 and a wiring cavity upper cover 143 are respectively fixedly installed at the lower end and the upper end of the wiring cavity tube 142. The wiring cavity 14 is assembled on the upper end of the cylinder body 131 through the wiring cavity partition plate 141.

[0055] A nameplate, a safety sign board, a warning sign board, and an Ex sign board are assembled on the surface of the wiring cavity upper cover 143 through rivets.

[0056] Specifically, the outer shell 111, the first explosion-proof cavity 12, and the second explosion-proof cavity 13 are all connected through flanges.

[0057] The connection can be better completed through the flanges, and the mating surfaces between the flanges require explosion-proof surface machining.

[0058] Specifically, the A1 connecting section 144 is electrically connected to the central temperature transmitter 124 through a communication line for transmitting the signal of the central temperature transmitter 124. A cable line is installed in the A5 connecting section 145 for supplying power to the electric heater 1.

[0059] The wiring terminals in the wiring cavity 14 include JF6 - 660 wiring terminals and JF8 - 1140 wiring terminals. A communication line is installed in the A1 connecting section 144 and connected to the JF6 - 660 wiring terminals, and the JF6 - 660 wiring terminals are connected to the central temperature transmitter 124 to realize the transmission of the signal of the central temperature transmitter 124.

[0060] A cable line is installed in the A5 connecting section 145 and connected to the JF8 - 1140 wiring terminals, and the JF8 - 1140 wiring terminals are connected to the electric heating tube wiring terminal 152 to realize power supply.

[0061] Specifically, asFigure 2 As shown in the figure, the nitrogen generation system includes a gas-liquid separator 5, a three-stage precision filter 6, an activated carbon fiber filter 7, a gas collecting pipe 8, and a membrane module 9. The gas-liquid separator 5, the three-stage precision filter 6, the activated carbon fiber filter 7, an electric heater 1, the gas collecting pipe 8, and the membrane module 9 are connected in sequence.

[0062] The gas-liquid separator 5, the three-stage precision filter 6, and the activated carbon fiber filter 7 belong to the filtration system.

[0063] Specifically, as Figure 2 shown in the figure, it also includes a cooler 2 and a pre-membrane sensor 3. The input end of the cooler 2 is connected to the external gas source system through a pipeline, and the output end of the cooler 2 is connected to the gas-liquid separator 5 through a pipeline. The pre-membrane sensor 3 is assembled on the gas outlet pipe 114 of the electric heater 1.

[0064] The cooler 2 uses water as the medium and can efficiently cool the high-temperature compressed gas of the external gas source, avoiding damage to the nitrogen generation system by high-temperature gas and playing a role in cooling and removing oil. The water pressure requirement of the cooler 2 is between 0.2 MPa and 0.5 MPa. The cooler 2 is equipped with a water pressure switch. When the water pressure is lower than 0.2 MPa, the electric control box 4 controls the external gas source to automatically cut off the power, stop the gas supply, and stop the machine.

[0065] Specifically, as Figure 2 shown in the figure, it also includes an electric control box 4, and the electric control box 4 is fixedly installed on the vehicle body. The electric control box 4 includes an electric heater control unit, a PID temperature control module, and an analog output module. The electric heater control unit is assembled on the electric heater 1. The PID temperature control module is connected to the pre-membrane sensor 3, and the analog output module is connected to the electric heater control unit.

[0066] The electric heater 1, the cooler 2, the pre-membrane sensor 3, and the electric control box 4 belong to the temperature protection system.

[0067] As Figure 5 shown in the figure, it is a control system diagram. For the control of the temperature protection system of the nitrogen generator, first, the electric control box 4 collects the 4-20 mA temperature signal of the pre-membrane sensor 3, performs A / D conversion on the temperature signal, and feeds the obtained variable value back to the PID temperature control module that controls the electric heater 1. The PID temperature control module that controls the electric heater 1 performs self-tuning operation on the variable value to obtain an intermediate variable. This intermediate variable is converted into a 4-20 mA current value through D / A conversion, and the current value is fed back to the electric heater control unit through the analog output module to control the heating temperature of the electric heater 1 according to the current value. While maintaining the gas flow rate and velocity of the gas flowing through the electric heater 1 unchanged, the temperature of the gas outlet is accurately adjusted to 55 °C, ensuring the smooth and effective operation of the subsequent membrane nitrogen generation work.

[0068] The nitrogen generation device adopts a one-key start control method, which includes starting the air compressor (external air source system). When all parameters of the air compressor are normal, the electric heater 1 is started after 5 minutes to heat the air (the electric heater 1 will not start if there is no air flowing through it); the air compressor compresses the air to form high-temperature compressed gas, and the high-temperature compressed gas completes preliminary condensation and oil removal through the cooler 2 in the temperature protection system, and after obtaining cold air at 30°C, it passes through the filtration system (WS type gas-liquid separator 5, three-stage precision filter 6 and activated carbon fiber filter 7) to complete further water, oil and dust removal work and reaches the electric heater 1. The cold air is heated in the electric heater 1, and the pre-membrane sensor 3 measures the temperature of the heated compressed gas and feeds the signal back to the electric control box 4. The electric control box 4 collects the temperature signal of the pre-membrane sensor 3 to monitor the temperature of the compressed gas in the pre-membrane pipeline in real time. The PID temperature control module provided in the system controls the temperature of the electric heater 1, so that the temperature of the gas flowing out of the electric heater 1 accurately reaches 55°C and flows into the membrane nitrogen generator as the gas entering the membrane.

[0069] In this process, while ensuring the uniform flow rate and velocity of the gas entering the membrane, the electric heater 1 realizes precise temperature control of the gas entering the membrane to achieve the purpose of protecting the membrane group and efficiently producing nitrogen.

[0070] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, many changes can be made in the specific implementation manner and application scope. As long as these changes do not depart from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A membrane group temperature protection system for a membrane separation nitrogen production device in an underground coal mine, characterized in that: It comprises a vehicle body, an electric heater (1) and a nitrogen production system, wherein the electric heater (1) and the nitrogen production system are both mounted on the vehicle body, and the electric heater (1) is connected to the nitrogen production system; The electric heater (1) comprises a container cavity (11), a first flameproof cavity (12), a second flameproof cavity (13), a wiring cavity (14) and an electric heating device (15), wherein the container cavity (11), the first flameproof cavity (12), the second flameproof cavity (13) and the wiring cavity (14) are sequentially connected by flange assembly from bottom to top, and the electric heating device (15) is assembled in the container cavity (11); The container cavity (11) comprises an outer shell (111), a probe protection tube (116), a probe protection head (117), a flow separator (118) and a metal sleeve (119); the first flameproof cavity (12) comprises a temperature protection sleeve (121), a cold end protection sleeve (122), a heating tube fixing sleeve (123) and a central temperature transmitter (124); the second flameproof cavity (13) comprises a cylinder (131); the wiring cavity (14) comprises a wiring cavity tube (142), an A1 connecting joint (144), an A5 connecting joint (145) and a connecting terminal; the electric heating device (15) comprises an electric heating tube (151), an electric heating tube connecting terminal (152) and an insulating bead (153); A plurality of the flow partitions (118) are staggeredly installed in the inner cavity of the shell (111) from top to bottom and from left to right; a plurality of the metal sleeves (119) are vertically installed in the shell (111), and the upper ends of the metal sleeves (119) are connected to the cold end protection sleeves (122) in a one-to-one correspondence; the heating tube fixing sleeve (123) is installed at the upper end of the cold end protection sleeve (122), and the electric heating tube (151) is placed inside the cold end protection sleeve (122) and the metal sleeve (119); the probe protection tube (116) is installed inside the shell (111), and the probe protection head (117) is fixedly installed at the lower end of the probe protection tube (116); the temperature protection sleeve (121) is installed between the shell (111) and the cylinder (131); the central temperature variable The transmitter (124) is installed in the probe protection tube (116) and the temperature protection sleeve (121), and the lower end of the central temperature transmitter (124) is located in the probe protection head (117). The wiring cavity tube (142) is installed at the upper end of the cylinder (131), and the wiring terminal is installed inside the wiring cavity tube (142). The A1 connecting node (144) and the A5 connecting node (145) are respectively installed on the side surface of the wiring cavity tube (142). The electric heating tube terminal (152) and the insulating bead (153) are fixedly installed on the upper end of the electric heating tube (151). The multiple terminals are respectively electrically connected to the central temperature transmitter (124), the electric heating tube terminal (152), the A1 connecting node (144), and the A5 connecting node (145).

2. According to the membrane group temperature protection system of the membrane separation nitrogen production device in underground coal mines as described in claim 1, it is characterized by: The lower end of the shell (111) is provided with a sewage outlet (112), the lower side of the outer wall of the shell (111) is equipped with a shell support seat (113) and an air outlet pipe (114), and the shell support seat (113) is welded to the vehicle body, and the upper side of the outer wall of the shell (111) is equipped with an air intake pipe (115).

3. According to the membrane group temperature protection system of the membrane separation nitrogen production device in underground coal mines as described in claim 1, it is characterized by: The surface of the flow partition (118) is evenly provided with circular holes, and the metal sleeve (119) is assembled in the circular hole. The metal sleeve (119) and the electric heating tube (151) are matching threaded tubes.

4. According to the membrane group temperature protection system of the membrane separation nitrogen production device in underground coal mines as described in claim 1, it is characterized by: An insulating sleeve (125) is mounted on the inner side of the upper end of the heating tube fixing sleeve (123), and the electric heating tube (151) is located inside the insulating sleeve (125).

5. According to the membrane group temperature protection system of the membrane separation nitrogen production device in underground coal mines as described in claim 1, it is characterized by: A wiring cavity partition (141) and a wiring cavity upper cover (143) are respectively fixedly mounted on the lower end and the upper end of the wiring cavity tube (142); the wiring cavity (14) is assembled on the upper end of the cylinder (131) via the wiring cavity partition (141).

6. According to the membrane group temperature protection system of the membrane separation nitrogen production device in underground coal mines as described in claim 1, it is characterized by: The housing (111), the first flameproof chamber (12) and the second flameproof chamber (13) are all connected via flanges.

7. According to the membrane group temperature protection system of the membrane separation nitrogen production device in underground coal mines as described in claim 1, it is characterized by: The A1 connecting node (144) is electrically connected to the central temperature transmitter (124) via a communication line for transmitting the signal of the central temperature transmitter (124). The A5 connecting node (145) is equipped with a cable for supplying power to the electric heater (1).

8. According to the membrane group temperature protection system of the membrane separation nitrogen production device in underground coal mines as described in claim 1, it is characterized by: The nitrogen production system comprises a gas-liquid separator (5), a three-stage precision filter (6), an activated carbon fiber filter (7), a gas collecting pipe (8) and a membrane group (9), wherein the gas-liquid separator (5), the three-stage precision filter (6), the activated carbon fiber filter (7), the electric heater (1), the gas collecting pipe (8) and the membrane group (9) are connected in sequence.

9. A membrane group temperature protection system for a membrane separation nitrogen production device in an underground coal mine according to claim 8, characterized in that: It also includes a cooler (2) and a pre-membrane sensor (3), wherein the input end of the cooler (2) is connected to an external gas source system via a pipeline, and the output end of the cooler (2) is connected to a gas-liquid separator (5) via a pipeline, and the pre-membrane sensor (3) is mounted on the gas outlet pipe (114) of the electric heater (1).

10. The membrane group temperature protection system of the membrane separation nitrogen production device in underground coal mines according to claim 9, characterized in that: It also includes an electric control box (4), and the electric control box (4) is fixedly installed on the vehicle body, the electric control box (4) includes an electric heater control unit, a PID temperature control module and an analog output module, the electric heater control unit is assembled on the electric heater (1), the PID temperature control module is connected to the front membrane sensor (3), and the analog output module is connected to the electric heater control unit.

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