Membrane separation equipment for helium purification

Abstract

The invention belongs to the technical field of helium purification, and particularly relates to membrane separation equipment for helium purification, the membrane separation equipment comprises a first circular shell and a second circular shell, and openings of the first circular shell and the second circular shell are hermetically connected with a first shell cover and a second shell cover through bolts respectively. The helium purification membrane separation device not only has the functions of gas washing, efficient dust removal, purification blockage prevention, selective purification of helium-rich raw gas, helium purification efficiency monitoring and circulating purification of a plurality of purified water layers, but also has the function of timely and automatic cleaning of the helium separation membrane mechanism and the hydrogen separation membrane mechanism; the device does not purify oxygen-enriched feed gas with low helium concentration, so that the energy consumption of the device can be reduced, the energy-saving and environment-friendly performance of the device is further improved, the purity of helium purification can be effectively improved through two-time purification, the device has the continuous purification capacity through automatic cleaning of a helium purification membrane structure, and the service life of the device is prolonged. Therefore, the helium purification efficiency and reliability of the device can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of helium purification, and in particular relates to a membrane separation device for helium purification. Background Art

[0002] Membrane separation is a relatively advanced helium purification technology. This technology uses advanced helium separation membrane materials as core components, uses the partial pressure difference of the gas on both sides of the membrane as a driving force, and separates and purifies helium through the difference in the selective permeability of the membrane to different component gases. The membrane separation method can be operated at room temperature, has low pressure requirements, and has the characteristics of small size, low energy consumption, simple operation, no energy required, and high degree of automation. For example, a separation device using a gas membrane to purify helium is proposed in patent announcement number CN116585845A.

[0003] When the existing helium purification device is in use, some helium-rich raw gas contains hydrogen and trace dust particles. Although pretreatment measures such as filtration are adopted, a very small amount of dust particles and hydrogen still pass through the pretreatment equipment into the membrane separation helium purification device, wherein the dust will gradually accumulate on the membrane surface, reducing the helium separation and purification efficiency of the separation membrane. Therefore, the helium separation membrane needs to be cleaned regularly to remove impurities adsorbed on the surface, etc. However, the concentration of dust particles in the helium-rich raw gas is unstable, and the helium separation membrane is located inside the device, so the staff cannot timely understand the specific blockage of the helium separation membrane, and it is easy to cause the helium separation membrane to be untimely cleaned. At the same time, due to the small molecular volume of hydrogen, it will penetrate the helium separation membrane under the action of pressure difference, which has an adverse effect on the purity of helium purification, not only affecting the efficiency of helium purification, but also affecting the reliability of the use of the helium purification device; In addition, when the helium purification device is working, the helium concentration in the helium-rich raw gas is not stable. When the helium concentration is low, if the device still purifies the raw gas with low helium concentration, not only will the helium purification output be low, but it will also affect the efficiency of subsequent purification of helium-rich raw gas, and increase the energy consumption of the helium purification device, further affecting the energy-saving and environmental protection performance of the helium purification device.

[0004] Therefore, we propose a membrane separation device for helium purification to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a membrane separation device for helium purification in view of the above problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: a membrane separation device for helium purification, comprising a first circular shell and a second circular shell, wherein the openings of the first circular shell and the second circular shell are respectively sealed and connected with a first shell cover and a second shell cover by bolts, and the first circular shell and the second circular shell are fixedly connected with a rectangular cylinder on opposite sides, and the outer walls of the first circular shell and the second circular shell on opposite sides are both provided with connecting through holes, and the hole walls of the connecting through holes are fixedly connected with a first sealing bearing, and the inner walls of the inner rings of the two first sealing bearings are fixedly connected with a rotating disk mechanism; The connecting grooves on both sides of the rotating disk mechanism are respectively connected to a helium separation membrane mechanism and a hydrogen separation membrane mechanism; An air guide mechanism is fixedly connected to the upper surface of the rectangular tube; The bottom outer walls of the first circular shell and the second circular shell are commonly connected with a circulating air washing mechanism; The inner side walls of the first shell cover and the second shell cover are fixedly connected with the first partition plate and the second partition plate respectively, the outer wall of the first circular shell is fixedly connected with the monitoring mechanism, and the top outer wall of the second shell cover is fixedly connected with the discharge valve.

[0007] In the above-mentioned membrane separation equipment for helium purification, the outer wall of the first partition is fixedly connected to a first sealing ring, and the outer wall of the first sealing ring is in sealing contact with the inner wall of the first circular shell, the outer wall of the side end of the rotating disk mechanism and the outer wall of the helium separation membrane mechanism. The first partition cooperates with one side end of the rotating disk mechanism to separate the internal cavity of the first circular shell into a helium purification zone, a first cleaning zone and an exhaust zone. The outer wall of the second partition is fixedly connected to a second sealing ring, and the outer wall of the second sealing ring is in sealing contact with the inner wall of the second circular shell, the outer wall of the other side end of the rotating disk mechanism and the outer wall of the hydrogen separation membrane mechanism. The second partition cooperates with the other side end of the rotating disk mechanism to separate the internal cavity of the second circular shell into a hydrogen separation zone, a second cleaning zone and a gas guide zone.

[0008] In the above-mentioned membrane separation equipment for helium purification, the rotating disk mechanism includes a rotating rod fixedly connected to the inner walls of two first sealing bearings, both ends of the rotating rod are fixedly connected to air-permeable ceramic connecting disks, the inner wall of the connecting groove of the air-permeable ceramic connecting disk is provided with two symmetrically distributed slots, the outer wall of the air-permeable ceramic connecting disk is fixedly connected to the second sealing bearing, the outer wall of the second sealing bearing is movably sealed with a sealing rubber ring, the outer walls of the two second sealing bearings and the sealing rubber ring are respectively fixedly connected to the inner walls of the first circular shell and the second circular shell, the inner wall of the rectangular cylinder is fixedly connected to a driving motor, the output end of the driving motor is fixedly connected to a gear, and the rod wall of the rotating rod is fixedly sleeved with an external gear ring meshing with the outer wall of the gear.

[0009] In the above-mentioned membrane separation equipment for helium purification, the helium separation membrane mechanism includes a first breathable ceramic support plate connected to the inner wall of the connecting groove of the breathable ceramic connecting plate, the inlet side surface of the first breathable ceramic support plate is fixedly sleeved with a helium separation membrane cover, the inner wall of the connecting groove of the breathable ceramic connecting plate is sealingly sleeved with the membrane surface of the helium separation membrane cover located on the side of the first breathable ceramic support plate, and the outlet side surface of the first breathable ceramic support plate is fixedly connected with two first plug-in blocks matching with the slots.

[0010] In the above-mentioned membrane separation equipment for helium purification, the hydrogen separation membrane mechanism includes a second breathable ceramic support plate connected to the inner wall of the connecting groove of the breathable ceramic connecting plate, the air inlet side surface of the second breathable ceramic support plate is fixedly sleeved with a hydrogen separation membrane cover, the inner wall of the connecting groove of the breathable ceramic connecting plate is sealingly sleeved with the membrane surface of the hydrogen separation membrane cover located on the side of the second breathable ceramic support plate, and the air outlet side surface of the second breathable ceramic support plate is fixedly connected with two second plug-ins that cooperate with the slots.

[0011] In the above-mentioned membrane separation equipment for helium purification, the air guiding mechanism includes a first unidirectional air pump and a second unidirectional air pump fixedly connected to the upper surface of the rectangular cylinder, the air inlet end of the first unidirectional air pump is fixedly connected to the outer wall of the first circular shell located in the exhaust area, the air outlet end of the first unidirectional air pump is fixedly connected to a first conduit, the air outlet end of the first conduit is fixedly connected to the outer wall of the second circular shell located in the hydrogen separation area, the air inlet end of the second unidirectional air pump is fixedly connected to the outer wall of the second circular shell located in the air guiding area, the air outlet end of the second unidirectional air pump is fixedly connected to the second conduit, and the air outlet end of the second conduit passes through the rectangular cylinder and extends downward.

[0012] In the above-mentioned membrane separation equipment for helium purification, the circulating scrubbing mechanism includes a support block fixedly connected to the bottom end of the first circular shell, the bottom end of the support block is fixedly connected to a scrubbing water tank, the side end bottom of the scrubbing water tank is fixedly connected to an air inlet connecting valve, the outlet end of the second conduit is fixedly connected to the top of the scrubbing water tank, the side end top of the scrubbing water tank is fixedly connected to a delivery pipe, the outlet end of the delivery pipe is fixedly connected to a gas-liquid separator, the outlet end of the gas-liquid separator is fixedly connected to the top outer wall of the first shell cover, the inner wall of the scrubbing water tank is fixedly connected to a one-way water pump, the side end of the scrubbing water tank is provided with a mounting hole, and the hole wall of the mounting hole is fixedly connected to a filter cartridge, the water outlet end of the one-way water pump is fixedly connected to the side end of the filter cartridge, the inner wall of the filter cartridge is fixedly connected to a sealing support ring, the outer wall of the sealing support ring is sleeved with a ceramic filter cover, and the inner wall of the ceramic filter cover is fixedly The filter cartridge is fixedly connected to a sponge filter sleeve, and the side end of the filter cartridge is threadedly connected to a sealing plug for limiting the ceramic filter cover, the outer wall of the filter cartridge is fixedly connected to a first water pipe, the water outlet end of the first water pipe is fixedly connected to the outer wall of the first shell cover located in the first cleaning area, the bottom ends of the first circular shell and the second circular shell are jointly fixedly embedded with a U-shaped water pipe, the top ends of both sides of the U-shaped water pipe extend to the tops of the first cleaning area and the second cleaning area respectively, the outer wall of the second circular shell located in the second cleaning area is fixedly embedded with a second water pipe, the bottom end of the second water pipe passes through the top of the cleaning water tank, the top end of the second water pipe is fixedly connected to a water inlet check valve, the upper surface of the gas washing water tank is fixedly connected to a PLC controller, the bottom end of the gas washing water tank is filled with a first pure water layer, the bottom end of the first cleaning area is filled with a second pure water layer, and the bottom end of the second cleaning area is filled with a third pure water layer.

[0013] In the above-mentioned membrane separation equipment for helium purification, the monitoring mechanism includes a helium concentration sensor and an impurity concentration sensor, the helium concentration sensor is fixedly embedded and connected to the outer wall of the first circular shell located in the helium purification area, and the impurity concentration sensor is fixedly embedded and connected to the outer wall of the first circular shell located in the first cleaning area. The top end of the first circular shell is fixedly connected to a control solenoid valve, and the air outlet end of the control solenoid valve is fixedly connected to an L-shaped nozzle. An electronic burner is provided under the nozzle of the L-shaped nozzle, and the outer wall of the electronic burner is fixedly connected to the outer wall of the first circular shell.

[0014] In the above-mentioned membrane separation device for helium purification, the bottom ends of the first circular shell and the second circular shell are fixedly connected with connecting rods, and the rod wall of the connecting rod is sleeved with a soft brush via a rolling bearing.

[0015] Compared with the existing technology, the advantages of a membrane separation device for helium purification are: 1. Through the circulating scrubbing mechanism, helium separation membrane mechanism and hydrogen separation membrane mechanism, when the helium-rich raw gas is used for helium purification, the helium-rich raw gas first passes through the first pure water layer in the scrubbing water tank to perform scrubbing and dust removal of the helium-rich raw gas, so as to avoid the dust impurities in the helium-rich raw gas from clogging the helium separation membrane mechanism, and then the water in the helium-rich raw gas is separated by the gas-liquid separator, and then the helium-rich raw gas is preliminarily purified by the helium separation membrane mechanism, and then the preliminarily purified helium is transported to the hydrogen separation membrane mechanism through the gas guide mechanism for hydrogen separation and further purification, and the helium purification process is equipped with The combined monitoring mechanism detects the helium concentration of the helium-rich raw gas. When the helium concentration does not meet the standard, the device does not purify the helium, thereby reducing the energy consumption of the device. After the helium concentration meets the standard, the helium is purified. This mechanism enables the helium purification membrane separation device to not only have the function of efficient gas washing, dust removal and purification blockage prevention, but also has the function of selectively purifying the helium-rich raw gas. The hydrogen-rich raw gas with low helium concentration is not purified to reduce the energy consumption of the device. Moreover, the two purifications can effectively improve the purity of the helium purification, as well as the efficiency and reliability of the device in purifying helium, and further improve the energy-saving and environmental protection performance of the device.

[0016] 2. Through the setting of the rotating disk mechanism, during the helium purification process, the PLC controller controls the rotating disk mechanism to work, and the rotating disk mechanism can drive the helium separation membrane mechanism and the hydrogen separation membrane mechanism to rotate, and the helium separation membrane cover and the hydrogen separation membrane cover are cleaned by the second pure water layer and the third pure water layer respectively during the rotation process, and the soft brush assistance during the cleaning process can improve the cleaning effect, so that the membrane structure will not be blocked during the helium membrane purification process to affect the purification efficiency, and the automatic cleaning does not require the suspension of the device for manual maintenance, which saves time and effort. The mechanism enables the device to have the function of timely and automatic cleaning of the helium separation membrane mechanism and the hydrogen separation membrane mechanism, and there is no need to stop the device for manual cleaning of the helium purification membrane structure, so that the device has the ability of continuous purification, which not only improves the convenience of device maintenance and cleaning, but also improves the efficiency and reliability of helium purification, and reduces the labor intensity of the staff.

[0017] 3. Through the impurity concentration sensor and circulating gas washing mechanism, when the impurity concentration sensor detects that the powder concentration of the second pure water layer in the first cleaning area exceeds the standard, it means that the helium-rich raw gas transported to the helium purification area has more particulate impurities, which can easily cause the helium separation membrane cover helium channel blockage and affect the efficiency of helium purification. At this time, the PLC controller controls the actual power of the drive motor and the one-way water pump to increase to the rated maximum power, and speeds up the rotation and cleaning speed of the helium separation membrane cover to ensure that the helium purification is not blocked by dust and the efficiency of helium purification is ensured. The increase in the operating power of the one-way water pump can speed up the circulation purification speed of the first pure water layer, the second pure water layer and the third pure water layer, ensuring that the second pure water layer in the first cleaning area and the third pure water layer in the second cleaning area maintain a high cleanliness level, thereby ensuring the cleaning effect of the helium separation membrane cover and the hydrogen separation membrane cover. This mechanism enables the device to have the functions of helium purification efficiency monitoring and circulation purification of multiple pure water layers, which can not only ensure the efficiency of helium purification, but also improve the convenience of device maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a membrane separation device for helium purification provided by the present invention; Figure 2 It is a schematic structural diagram of a cross-section of a membrane separation device for helium purification provided by the present invention; Figure 3 yes Figure 1 A schematic structural diagram of the first circular shell portion as viewed from the right side; Figure 4 yes Figure 1 A schematic structural diagram of the second circular shell portion from the left side; Figure 5 It is a structural schematic diagram of a helium separation membrane mechanism in a membrane separation device for helium purification provided by the present invention; Figure 6 It is a structural schematic diagram of a hydrogen separation membrane mechanism in a membrane separation device for helium purification provided by the present invention; Figure 7 It is a structural schematic diagram of a gas permeable ceramic connecting disk part in a membrane separation device for helium purification provided by the present invention; Figure 8 It is a schematic diagram of the structure inside the filter cartridge in a membrane separation device for helium purification provided by the present invention; Fig. 9 It is a structural schematic diagram of a monitoring mechanism in a membrane separation device for helium purification provided by the present invention; Fig.10 It is a structural schematic diagram of part A of a membrane separation device for helium purification provided by the present invention.

[0019] In the figure: 1 first circular shell, 2 second circular shell, 3 first shell cover, 4 rotating disk mechanism, 41 rotating rod, 42 air permeable ceramic connecting disk, 43 slot, 44 second sealing bearing, 45 sealing rubber ring, 46 driving motor, 47 gear, 48 outer gear ring, 5 helium separation membrane mechanism, 51 first air permeable ceramic support plate, 52 helium separation membrane cover, 53 first plug block, 6 hydrogen separation membrane mechanism, 61 second air permeable ceramic support plate, 62 hydrogen separation membrane cover, 63 second plug block, 7 air guide mechanism, 71 first one-way air pump, 72 second one-way air pump, 73 first conduit, 74 second conduit, 8 circulating washing mechanism, 81 support block, 82 washing water tank, 83 air inlet connecting valve, 84 delivery pipe, 85 gas-liquid separator, 86 one-way water pump, 87 filter cartridge, 88 sealing support Support ring, 89 ceramic filter cover, 810 sponge filter sleeve, 811 sealing plug, 812 first water pipe, 813 U-shaped water pipe, 814 second water pipe, 815 water inlet check valve, 816 PLC controller, 817 first pure water layer, 818 second pure water layer, 819 third pure water layer, 9 monitoring mechanism, 91 helium concentration sensor, 92 impurity concentration sensor, 93 control solenoid valve, 94 L-shaped nozzle, 95 electronic burner, 10 second shell cover, 11 rectangular cylinder, 12 first sealing bearing, 13 first partition, 14 second partition, 15 discharge valve, 16 first sealing ring, 17 helium purification area, 18 first cleaning area, 19 exhaust area, 20 hydrogen separation area, 21 second cleaning area, 22 gas guide area, 23 connecting rod, 24 soft brush, 25 second sealing ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1-Figure 10 As shown, a membrane separation device for helium purification includes a first circular shell 1 and a second circular shell 2, the openings of the first circular shell 1 and the second circular shell 2 are respectively sealed and connected with a first shell cover 3 and a second shell cover 10 by bolts, the first circular shell 1 and the second circular shell 2 are fixedly connected with a rectangular cylinder 11 on opposite sides, and the outer walls of the first circular shell 1 and the second circular shell 2 on opposite sides are both provided with connecting through holes, and the hole walls of the connecting through holes are fixedly connected with a first sealed bearing 12.

[0022] The connecting grooves on both sides of the rotating disk mechanism 4 are respectively connected to the helium separation membrane mechanism 5 and the hydrogen separation membrane mechanism 6. The helium separation membrane mechanism 5 includes a first breathable ceramic support plate 51 connected to the inner wall of the connecting groove of the breathable ceramic connecting disk 42. The inlet side surface of the first breathable ceramic support plate 51 is fixedly sleeved with a helium separation membrane cover 52. The inner wall of the connecting groove of the breathable ceramic connecting disk 42 is sealed with the membrane surface of the helium separation membrane cover 52 located on the side of the first breathable ceramic support plate 51. The outlet side surface of the first breathable ceramic support plate 51 is fixedly connected with two first plug-in blocks 53 that match the slots 43. The hydrogen separation membrane mechanism 6 includes a second breathable ceramic support plate 61 connected to the inner wall of the connecting groove of the breathable ceramic connecting disk 42. The second breathable ceramic support plate 61 A hydrogen separation membrane cover 62 is fixedly sleeved on the air inlet side surface, the inner wall of the connecting groove of the air permeable ceramic connecting plate 42 is sealingly sleeved with the membrane surface of the hydrogen separation membrane cover 62 located on the side of the second air permeable ceramic support plate 61, and two second plug-in blocks 63 matching with the slots 43 are fixedly connected to the air outlet side surface of the second air permeable ceramic support plate 61. This mechanism can separate hydrogen from the initially purified helium, thereby further improving the purity of the helium purification.

[0023] The inner walls of the inner rings of the two first sealed bearings 12 are fixedly connected with a rotating disk mechanism 4, and the rotating disk mechanism 4 includes a rotating rod 41 fixedly connected to the inner walls of the two first sealed bearings 12, and both ends of the rotating rod 41 are fixedly connected with a breathable ceramic connecting disk 42, and the inner wall of the connecting groove of the breathable ceramic connecting disk 42 is provided with two symmetrically distributed slots 43, and the outer wall of the breathable ceramic connecting disk 42 is fixedly connected with a second sealed bearing 44, and the outer wall of the second sealed bearing 44 is movably sealed with a sealing rubber ring 45, and the outer walls of the two second sealed bearings 44 and the sealing rubber ring 45 are respectively connected to the first circular shell 1 and the second circular shell 1. The inner wall of the rectangular shell 2 is fixedly connected, the inner wall of the rectangular cylinder 11 is fixedly connected with a driving motor 46, the output end of the driving motor 46 is fixedly connected with a gear 47, and the rod wall of the rotating rod 41 is fixedly sleeved with an outer gear ring 48 meshing with the outer wall of the gear 47. This mechanism enables the device to have the function of timely automatic cleaning of the helium separation membrane mechanism 5 and the hydrogen separation membrane mechanism 6, and there is no need to stop the device to manually clean the helium purification membrane structure, which saves time and effort, and enables the device to have the ability of continuous purification, which not only improves the convenience of maintenance and cleaning of the device, but also improves the efficiency and reliability of helium purification, and reduces the labor intensity of the staff.

[0024] An air guiding mechanism 7 is fixedly connected to the upper surface of the rectangular cylinder 11, and the air guiding mechanism 7 includes a first one-way air pump 71 and a second one-way air pump 72 fixedly connected to the upper surface of the rectangular cylinder 11. The air inlet end of the first one-way air pump 71 is fixedly connected to the outer wall of the first circular shell 1 located at the exhaust area 19, and the air outlet end of the first one-way air pump 71 is fixedly connected to a first conduit 73, and the air outlet end of the first conduit 73 is fixedly connected to the outer wall of the second circular shell 2 located at the hydrogen separation area 20. The air inlet end of the second one-way air pump 72 is fixedly connected to the outer wall of the second circular shell 2 located at the air guiding area 22, and the air outlet end of the second one-way air pump 72 is fixedly connected to a second conduit 74. The air outlet end of the second conduit 74 passes through the rectangular cylinder 11 and extends downward. This mechanism can increase the pressure difference of helium purification and ensure the effect of helium purification.

[0025] The outer walls of the bottom ends of the first circular shell 1 and the second circular shell 2 are commonly connected with a circulating air-washing mechanism 8, which includes a support block 81 fixedly connected to the bottom end of the first circular shell 1, a washing water tank 82 fixedly connected to the bottom end of the support block 81, an air inlet connection valve 83 fixedly connected to the bottom of the side end of the washing water tank 82, an air outlet end of the second conduit 74 is fixedly connected to the top of the washing water tank 82, a delivery pipe 84 is fixedly connected to the top of the side end of the washing water tank 82, and an air outlet end of the delivery pipe 84 is fixedly connected to a gas-liquid separator 8 5, the gas outlet end of the gas-liquid separator 85 is fixedly connected to the outer wall of the top end of the first shell cover 3, the inner wall of the gas washing water tank 82 is fixedly connected with a one-way water pump 86, the side end of the gas washing water tank 82 is provided with a mounting hole, and the hole wall of the mounting hole is fixedly connected with a filter cartridge 87, the water outlet end of the one-way water pump 86 is fixedly connected to the side end of the filter cartridge 87, the inner wall of the filter cartridge 87 is fixedly connected with a sealing support ring 88, the outer wall of the sealing support ring 88 is sleeved with a ceramic filter cover 89, and the inner wall of the ceramic filter cover 89 is fixedly connected with a sponge filter cover 810, The side end of the filter cartridge 87 is threadedly connected with a sealing plug 811 for limiting the ceramic filter cover 89. The outer wall of the filter cartridge 87 is fixedly connected with a first water pipe 812. The water outlet end of the first water pipe 812 is fixedly connected with the outer wall of the first shell cover 3 located in the first cleaning area 18. The bottom ends of the first circular shell 1 and the second circular shell 2 are jointly fixedly embedded with a U-shaped water pipe 813. The top ends of both sides of the U-shaped water pipe 813 extend to the tops of the first cleaning area 18 and the second cleaning area 21 respectively. The second circular shell 2 is located outside the second cleaning area 21. A second water pipe 814 is fixedly embedded in the wall, and the bottom end of the second water pipe 814 passes through the top of the cleaning water tank. The top end of the second water pipe 814 is fixedly connected to a water inlet check valve 815. The upper surface of the gas washing water tank 82 is fixedly connected to a PLC controller 816. The bottom end of the gas washing water tank 82 is filled with a first pure water layer 817, the bottom end of the first cleaning area 18 is filled with a second pure water layer 818, and the bottom end of the second cleaning area 21 is filled with a third pure water layer 819. This mechanism enables the helium-rich raw gas to be washed and dust-removed.

[0026] The inner walls of the first shell cover 3 and the second shell cover 10 are fixedly connected with the first partition plate 13 and the second partition plate 14 respectively. The outer wall of the first circular shell 1 is fixedly connected with a monitoring mechanism 9, and the monitoring mechanism 9 includes a helium concentration sensor 91 and an impurity concentration sensor 92. The helium concentration sensor 91 is fixedly embedded in the outer wall of the first circular shell 1 located in the helium purification area 17, and the impurity concentration sensor 92 is fixedly embedded in the outer wall of the first circular shell 1 located in the first cleaning area 18. The top of the first circular shell 1 is fixedly connected with a control solenoid valve 93, and the air outlet end of the control solenoid valve 93 is fixedly connected with an L-shaped nozzle 94. An electronic burner 95 is provided under the nozzle of the L-shaped nozzle 94, and the outer wall of the electronic burner 95 is fixedly connected to the outer wall of the first circular shell 1. This mechanism enables the device to have the functions of helium purification efficiency monitoring and multiple pure water layer circulation purification, which can not only ensure the efficiency of helium purification, but also improve the convenience of device maintenance.

[0027] The top outer wall of the second shell cover 10 is fixedly connected to a discharge valve 15, the outer wall of the first partition 13 is fixedly connected to a first sealing ring 16, the outer wall of the first sealing ring 16 is in sealing contact with the inner wall of the first circular shell 1, the side outer wall of the rotating disk mechanism 4 and the outer wall of the helium separation membrane mechanism 5, the first partition 13 cooperates with one side end of the rotating disk mechanism 4 to separate the internal cavity of the first circular shell 1 into a helium purification zone 17, a first cleaning zone 18 and an exhaust zone 19, the outer wall of the second partition 14 is fixedly connected to a second sealing ring 25, the outer wall of the second sealing ring 25 is in sealing contact with the inner wall of the second circular shell 2, the other side outer wall of the rotating disk mechanism 4 and the outer wall of the hydrogen separation membrane mechanism 6, the second partition 14 cooperates with the other side end of the rotating disk mechanism 4 to separate the internal cavity of the second circular shell 2 into a hydrogen separation zone 20, a second cleaning zone 21 and a gas guide zone 22.

[0028] The bottom ends of the first circular shell 1 and the second circular shell 2 are both fixedly connected with a connecting rod 23, and the rod wall of the connecting rod 23 is sleeved with a soft brush 24 through a rolling bearing. The soft brush 24 can clean the helium separation membrane cover 52 and the hydrogen separation membrane cover 62 to ensure the efficiency of helium purification.

[0029] The first unidirectional air pump 71, the second unidirectional air pump 72, the unidirectional water pump 86, the drive motor 46, the control solenoid valve 93 and the electronic burner 95 are all electrically connected to the output end of the PLC controller 816 through wires. The helium concentration sensor 91 and the impurity concentration sensor 92 are all electrically connected to the input end of the PLC controller 816 through wires. The helium concentration sensor 91 is a thermal conductivity sensor. The thermal conductivity sensor uses the difference in thermal conductivity between helium and other gases to detect the helium concentration. When the mixed gas containing helium passes through the thermal conductivity sensor, the high thermal conductivity of helium will cause the temperature distribution in the sensor to change, thereby causing the resistance value of the thermistor to change. The concentration of helium can be determined by measuring the change in resistance value. The impurity concentration sensor 92 is a turbidity sensor. The turbidity sensor is based on the principle of light scattering or transmission. It reflects the concentration of particulate matter in the water by measuring the change in light intensity caused by the scattering or absorption of particulate matter when light passes through pure water. The above-mentioned power-on equipment and electrical connections are all existing technologies and are not described here.

[0030] The operating principle of the present invention is described as follows: when the helium-rich raw gas needs to be purified by helium, the helium separation membrane mechanism 5 is first installed in the air-permeable ceramic connection disk 42 inside the first circular shell 1, and the first shell cover 3 is connected to seal, and the hydrogen separation membrane mechanism 6 is installed in the air-permeable ceramic connection disk 42 inside the second circular shell 2, and the second shell cover 10 is connected to seal, and then the helium-rich raw gas is transported to the first pure water layer 817 of the scrubbing water tank 82 through the air inlet connection valve 83. Since helium is insoluble in water, the dust reduction effect of the first pure water layer 817 can be used to scrub the helium-rich raw gas to remove most of the particulate dust in the helium-rich raw gas, which can prevent the particulate dust from clogging the helium separation membrane cover 52 and affecting the efficiency of helium purification. Then the helium-rich raw gas in the scrubbing water tank 82 is transported to the gas-liquid separator 85 through the delivery pipe 84 to remove moisture, and finally the helium-rich raw gas with low dust content and no moisture is transported to the helium purification area 17 of the first circular shell 1; At the same time, the helium concentration sensor 91 detects the helium concentration of the helium-rich raw gas input into the helium purification zone 17, and the detected helium concentration value is sent to the PLC controller 816 in the form of an electrical signal. If the helium concentration value detected by the helium concentration sensor 91 is lower than the ineffective warning value preset by the PLC controller 816, that is, the helium content is lower than 0.1%, it has no purification value. If the helium-rich raw gas with low helium concentration is directly purified by helium, not only will the helium output be low, but it will also take a long time and affect the purification efficiency. Efficiency, and also high energy consumption cost due to the operation of various power-consuming devices in the device, the PLC controller 816 controls the first one-way vacuum pump 71, the second one-way vacuum pump 72, the one-way water pump 86 and the drive motor 46 not to start, so as to improve the energy-saving and environmental protection performance of the device, and at the same time, the PLC controller 816 starts the control solenoid valve 93 and the electronic burner 95 to work, and the raw gas in the helium purification area 17 is sprayed to the flame of the electronic burner 95 through the opened control solenoid valve 93 and the L-shaped nozzle 94 for harmless treatment; If the helium concentration value detected by the helium concentration sensor 91 is higher than the ineffective warning value preset by the PLC controller 816, the PLC controller 816 controls the first one-way air pump 71, the second one-way air pump 72, the one-way water pump 86, the drive motor 46, the control solenoid valve 93 and the electronic burner 95 to be powered on and started, and the first one-way air pump 71 sucks the air in the exhaust area 19 in the first circular shell 1, so that the air pressure in the exhaust area 19 is reduced, thereby forming a pressure difference on both sides of the helium separation membrane cover 52. This pressure difference can cause the helium in the helium purification area 17 to preferentially pass through the helium separation membrane cover 52, at the same time, a small amount of hydrogen in the helium-rich raw gas also passes through the helium separation membrane cover 52 under the action of the pressure difference, and then the helium and a small amount of hydrogen pass through the first gas-permeable ceramic support plate 51 and the gas-permeable ceramic connecting plate 42 to enter the exhaust area 19, thereby achieving preliminary purification of the helium, and the tail gas of the helium-rich raw gas is sprayed to the flame of the electronic burner 95 through the opened control solenoid valve 93 and the L-shaped nozzle 94 for harmless treatment, and then the helium and a small amount of hydrogen are transported to the gas guide area 22 of the second circular shell 2 through the first conduit 73, and at this time the second unidirectional air pump 72 sucks the air in the hydrogen separation area 20 The gas is passed through the second gas permeable ceramic support plate 61 and the gas permeable ceramic connection plate 42, and then the hydrogen separation zone 20 is placed in a low-pressure environment, thereby generating a pressure difference on both sides of the hydrogen separation membrane cover 62. This pressure difference can cause the hydrogen located in the gas guide zone 22 to preferentially pass through the hydrogen separation membrane cover 62, and only a small amount of helium passes through the hydrogen separation membrane cover 62, thereby improving the purity of the helium purification. The hydrogen and a small amount of helium pass through the second gas permeable ceramic support plate 61 and the gas permeable ceramic connection plate 42 and enter the hydrogen separation zone 20, thereby completing the re-purification of the helium. The purified helium is discharged through the exhaust valve and the helium is collected in the storage tank, while the hydrogen and a small amount of helium sucked by the second one-way air pump 72 are The amount of helium is then returned to the scrubbing water tank 82 through the second conduit 74, and the small amount of helium is purified and collected again to avoid wasting helium as much as possible. This mechanism enables the helium purification membrane separation device to not only have the function of high-efficiency dust removal and purification blockage prevention for scrubbing, but also have the function of selectively purifying helium-rich raw gas, and does not purify oxygen-rich raw gas with low helium concentration to reduce the energy consumption of the device, while increasing the output of helium purification of the device, and the two purifications can effectively improve the purity of helium purification, and can effectively improve the efficiency and reliability of the device for purifying helium, and further can improve the energy-saving and environmental protection performance of the device; After the PLC controller 816 controls the drive motor 46 to start, the drive motor 46 runs at an economical actual power of 70% of the rated power. This actual power can not only ensure the reliable use of the drive motor 46, but also reduce the power consumption and wear of the drive motor 46, and extend the service life of the drive motor 46. The drive motor 46 drives the rotating rod 41 to rotate slowly through the gear 47 and the outer gear ring 48. The rotating rod 41 drives the helium separation membrane mechanism 5 and the hydrogen separation membrane mechanism 6 to rotate at the same time through the breathable ceramic connecting plate 42 and the slot 43. During the rotation of the helium separation membrane mechanism 5 and the hydrogen separation membrane mechanism 6, the barrier effect of the first sealing ring 16 and the second sealing ring 25 makes the helium purification area 17 and the first cleaning area 18 in a sealed isolation state, and the gas guide area 22 and the hydrogen separation area 20 are also in a sealed isolation state, so that the gas will not escape from the first circular shell 1 and the second circular shell 2. The reliability of the device is ensured, and the helium separation membrane mechanism 5 rotates During the process, a small amount of dust embedded in the helium separation membrane cover 52 can be rotated and carried to the second pure water layer 818 of the first cleaning area 18, and is brushed by the soft brush 24 in the second pure water layer 818. Then, the cleaned part of the helium separation membrane cover 52 is rotated to the helium purification area 17 to work again. During the rotation process, the water stains on the surface of the helium separation membrane cover 52 are also scraped off by the first sealing ring 16 to ensure that the surface of the helium separation membrane cover 52 is dry and can reliably purify helium. Similarly, the second cleaning area 21 of the second circular shell 2, the third pure water layer 819 and the soft brush 24 can also clean and maintain the hydrogen separation membrane cover 62. This mechanism enables the device to have the function of timely and automatic cleaning of the helium separation membrane mechanism 5 and the hydrogen separation membrane mechanism 6. There is no need to stop the device to manually clean the helium purification membrane structure, so that the device has the ability of continuous purification, which not only improves the convenience of device maintenance and cleaning, but also improves the efficiency and reliability of helium purification, and reduces the labor intensity of the staff. After the PLC controller 816 controls the one-way water pump 86 to work, the one-way water pump 86 operates at an economic actual power of 70% of the rated power. This actual power can not only ensure the reliable use of the one-way water pump 86, but also reduce the power consumption and wear of the one-way water pump 86, and extend the service life of the one-way water pump 86. At the same time, the impurity concentration sensor 92 continuously monitors the particle impurity concentration of the second pure water layer 818 in the first cleaning area 18. The impurity concentration sensor 92 sends the detection value to the PLC controller 816 in the form of an electrical signal. If the detection value of the impurity concentration sensor 92 exceeds the preset value of the PLC controller 816, When the warning value reaches , it means that the helium-rich raw gas delivered to the helium purification area 17 contains a lot of particulate impurities, which may easily cause the helium passage of the helium separation membrane cover 52 to be blocked and affect the efficiency of helium purification. At this time, the PLC controller 816 controls the actual power of the drive motor 46 and the one-way water pump 86 to be increased to the rated maximum power, and the speed of the helium separation membrane cover 52 rotating and cleaning is accelerated to ensure that the helium purification is not blocked by dust and the efficiency of helium purification is ensured. The increase in the operating power of the one-way water pump 86 can accelerate the speed of the circulation purification of the first pure water layer 817, the second pure water layer 818 and the third pure water layer 819. The second pure water layer 818 of the first cleaning area 18 and the third pure water layer 819 of the second cleaning area 21 are ensured to maintain a high cleanliness level, thereby ensuring the cleaning effect of the helium separation membrane cover 52 and the hydrogen separation membrane cover 62. Specifically, the one-way water pump 86 transports the first pure water layer 817 of the washing water tank 82 to the filter cartridge 87 for filtration. The sponge filter sleeve 810 and the ceramic filter cover 89 in the filter cartridge 87 can purify the first pure water layer 817, and large particles of dust are intercepted by the sponge filter sleeve 810. The ceramic filter cover 89 can filter fine impurities and microorganisms, and can even filter ionic impurities. During maintenance, it is only necessary to replace the ceramic filter cover 89 and the sponge filter cover 810, which saves time and effort. Then, the purified pure water is transported to the first cleaning area 18 through the first water pipe 812, and is also transported to the second cleaning area 21 through the U-shaped water pipe 813. The water containing impurities in the first cleaning area 18 and the second cleaning area 21 is returned to the gas washing water tank 82 through the water inlet one-way valve 815 and the second water pipe 814 for recycling. This mechanism enables the device to have the functions of helium purification efficiency monitoring and multiple pure water layer circulation purification, which can not only ensure the efficiency of helium purification, but also improve the convenience of device maintenance.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A membrane separation device for helium purification, comprising a first circular shell (1) and a second circular shell (2), characterized in that: The openings of the first circular shell (1) and the second circular shell (2) are respectively sealed and connected to a first shell cover (3) and a second shell cover (10) by bolts; a rectangular cylinder (11) is fixedly connected to the first circular shell (1) and the second circular shell (2) on opposite sides; connecting through holes are formed on the outer walls of the first circular shell (1) and the second circular shell (2) on opposite sides; and first sealed bearings (12) are fixedly connected to the hole walls of the connecting through holes; and a rotating disk mechanism (4) is fixedly connected to the inner walls of the inner rings of the two first sealed bearings (12); The connecting grooves on both sides of the rotating disk mechanism (4) are respectively connected to a helium separation membrane mechanism (5) and a hydrogen separation membrane mechanism (6); An air guide mechanism (7) is fixedly connected to the upper surface of the rectangular tube (11); The outer walls of the bottom ends of the first circular shell (1) and the second circular shell (2) are commonly connected to a circulating air washing mechanism (8); The inner side walls of the first shell cover (3) and the second shell cover (10) are respectively fixedly connected to a first partition plate (13) and a second partition plate (14); the outer wall of the first circular shell (1) is fixedly connected to a monitoring mechanism (9); and the top outer wall of the second shell cover (10) is fixedly connected to a discharge valve (15).

2. A membrane separation device for helium purification according to claim 1, characterized in that: The outer wall of the first partition (13) is fixedly connected to a first sealing ring (16), the outer wall of the first sealing ring (16) is in sealing contact with the inner wall of the first circular shell (1), the outer wall of the side end of the rotating disk mechanism (4) and the outer wall of the helium separation membrane mechanism (5), the first partition (13) cooperates with one side end of the rotating disk mechanism (4) to separate the internal cavity of the first circular shell (1) into a helium purification zone (17), a first cleaning zone (18) and an exhaust zone (19), the outer wall of the second partition (14) is fixedly connected to a second sealing ring (25), the outer wall of the second sealing ring (25) is in sealing contact with the inner wall of the second circular shell (2), the outer wall of the other side end of the rotating disk mechanism (4) and the outer wall of the hydrogen separation membrane mechanism (6), the second partition (14) cooperates with the other side end of the rotating disk mechanism (4) to separate the internal cavity of the second circular shell (2) into a hydrogen separation zone (20), a second cleaning zone (21) and a gas guide zone (22).

3. The membrane separation device for helium purification according to claim 1, characterized in that: The rotating disk mechanism (4) comprises a rotating rod (41) fixedly connected to the inner walls of two first sealed bearings (12); two ends of the rotating rod (41) are fixedly connected to a permeable ceramic connecting disk (42); the inner wall of a connecting groove of the permeable ceramic connecting disk (42) is provided with two symmetrically distributed slots (43); the outer wall of the permeable ceramic connecting disk (42) is fixedly connected to a second sealed bearing (44); the outer wall of the second sealed bearing (44) is movably sealed to a sealing rubber ring (45); the outer walls of the two second sealed bearings (44) and the sealing rubber ring (45) are respectively fixedly connected to the inner walls of the first circular shell (1) and the second circular shell (2); the inner wall of the rectangular cylinder (11) is fixedly connected to a driving motor (46); the output end of the driving motor (46) is fixedly connected to a gear (47); and the rod wall of the rotating rod (41) is fixedly sleeved with an outer toothed ring (48) meshing with the outer wall of the gear (47).

4. A membrane separation device for helium purification according to claim 3, characterized in that: The helium separation membrane mechanism (5) comprises a first air-permeable ceramic support plate (51) connected to the inner wall of a connecting groove of an air-permeable ceramic connection plate (42); a helium separation membrane cover (52) is fixedly sleeved on the air inlet side surface of the first air-permeable ceramic support plate (51); the inner wall of the connecting groove of the air-permeable ceramic connection plate (42) is sealedly sleeved with a membrane surface of the helium separation membrane cover (52) located on the side of the first air-permeable ceramic support plate (51); and two first plug blocks (53) that match the slots (43) are fixedly connected to the air outlet side surface of the first air-permeable ceramic support plate (51).

5. The membrane separation device for helium purification according to claim 3, characterized in that: The hydrogen separation membrane mechanism (6) comprises a second breathable ceramic support plate (61) connected to the inner wall of the connecting groove of the breathable ceramic connecting plate (42); the inlet side surface of the second breathable ceramic support plate (61) is fixedly sleeved with a hydrogen separation membrane cover (62); the inner wall of the connecting groove of the breathable ceramic connecting plate (42) is sealedly sleeved with the membrane surface of the hydrogen separation membrane cover (62) located on the side of the second breathable ceramic support plate (61); and the outlet side surface of the second breathable ceramic support plate (61) is fixedly connected with two second plug blocks (63) that match the slots (43).

6. The membrane separation device for helium purification according to claim 1, characterized in that: The air guide mechanism (7) comprises a first one-way air pump (71) and a second one-way air pump (72) fixedly connected to the upper surface of the rectangular cylinder (11); an air inlet end of the first one-way air pump (71) is fixedly connected to the outer wall of the first circular shell (1) located at the exhaust area (19); an air outlet end of the first one-way air pump (71) is fixedly connected to a first conduit (73); an air outlet end of the first conduit (73) is fixedly connected to the outer wall of the second circular shell (2) located at the hydrogen separation area (20); an air inlet end of the second one-way air pump (72) is fixedly connected to the outer wall of the second circular shell (2) located at the air guide area (22); an air outlet end of the second one-way air pump (72) is fixedly connected to a second conduit (74); and an air outlet end of the second conduit (74) passes through the rectangular cylinder (11) and extends downward.

7. The membrane separation device for helium purification according to claim 6, characterized in that: The circulating air-washing mechanism (8) comprises a support block (81) fixedly connected to the bottom end of the first circular shell (1); the bottom end of the support block (81) is fixedly connected to an air-washing water tank (82); the bottom of the side end of the air-washing water tank (82) is fixedly connected to an air inlet connection valve (83); the air outlet end of the second conduit (74) is fixedly connected to the top of the air-washing water tank (82); the top of the side end of the air-washing water tank (82) is fixedly connected to a delivery pipe (84); the air outlet end of the delivery pipe (84) is fixedly connected to a gas-liquid separator (85); the air outlet end of the gas-liquid separator (85) is connected to the first shell cover. The top outer wall of the washing water tank (82) is fixedly connected, the inner wall of the washing water tank (82) is fixedly connected to a one-way water pump (86), the side end of the washing water tank (82) is provided with a mounting hole, and the hole wall of the mounting hole is fixedly connected to a filter cartridge (87), the water outlet end of the one-way water pump (86) is fixedly connected to the side end of the filter cartridge (87), the inner wall of the filter cartridge (87) is fixedly connected to a sealing support ring (88), the outer wall of the sealing support ring (88) is sleeved with a ceramic filter cover (89), the inner wall of the ceramic filter cover (89) is fixedly connected to a sponge filter cover (810), and the filter cartridge (87) is fixedly connected to the inner wall of the filter cartridge (87). ) is threadedly connected to a sealing plug (811) for limiting the position of the ceramic filter cover (89); the outer wall of the filter cartridge (87) is fixedly connected to a first water pipe (812); the water outlet end of the first water pipe (812) is fixedly connected to the outer wall of the first shell cover (3) located in the first cleaning area (18); the bottom ends of the first circular shell (1) and the second circular shell (2) are jointly fixedly embedded with a U-shaped water pipe (813); the top ends of both sides of the U-shaped water pipe (813) extend to the top of the first cleaning area (18) and the top of the second cleaning area (21) respectively; the second circular shell (2) is located in the second cleaning area (18); A second water pipe (814) is fixedly embedded in the outer wall of the cleaning area (21); the bottom end of the second water pipe (814) passes through the top of the cleaning water tank; the top end of the second water pipe (814) is fixedly connected to a water inlet check valve (815); the upper surface of the gas washing water tank (82) is fixedly connected to a PLC controller (816); the bottom end of the gas washing water tank (82) is filled with a first pure water layer (817); the bottom end of the first cleaning area (18) is filled with a second pure water layer (818); and the bottom end of the second cleaning area (21) is filled with a third pure water layer (819).

8. The membrane separation device for helium purification according to claim 1, characterized in that: The monitoring mechanism (9) comprises a helium concentration sensor (91) and an impurity concentration sensor (92); the helium concentration sensor (91) is fixedly embedded in the outer wall of the first circular shell (1) located in the helium purification area (17); the impurity concentration sensor (92) is fixedly embedded in the outer wall of the first circular shell (1) located in the first cleaning area (18); the top end of the first circular shell (1) is fixedly connected to a control solenoid valve (93); the gas outlet end of the control solenoid valve (93) is fixedly connected to an L-shaped nozzle (94); an electronic burner (95) is provided below the nozzle of the L-shaped nozzle (94); the outer wall of the electronic burner (95) is fixedly connected to the outer wall of the first circular shell (1).

9. The membrane separation device for helium purification according to claim 7, characterized in that: The bottom ends of the first circular shell (1) and the second circular shell (2) are both fixedly connected with a connecting rod (23), and a soft brush (24) is sleeved on the rod wall of the connecting rod (23) via a rolling bearing.

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