Device for purifying nitrogen in air by applying multi-stage membrane separation technology

Abstract

The utility model discloses a device for purifying air and nitrogen by applying a multistage membrane separation technology, and belongs to the technical field of concrete quality gas purification. A device for purifying air and nitrogen by applying a multistage membrane separation technology comprises a rack, a pretreatment box is fixed to the upper side of the rack, and an air storage tank and a nitrogen recovery tank are sequentially arranged on one side of the pretreatment box; according to the utility model, the innovation of an air nitrogen purification device is realized by combining a multi-stage membrane separation technology and a constant temperature control device, so that nitrogen is purified stage by stage under the action of different membrane pore sizes, and the purity and purification efficiency of the nitrogen are improved; meanwhile, by matching with the adjustment of a gas booster pump and a pressure meter, the working pressure is optimized, the purification efficiency of the nitrogen is improved, and the stability of gas molecules at a constant temperature is ensured and the performance of the membrane is maintained by applying a constant-temperature device, so that the purposes of improving the purity and the purification efficiency of the nitrogen and ensuring the stability and the reliability of the device at the same time are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete quality gas purification, in particular to an air nitrogen purification device applied with a multi-stage membrane separation technology. Background Art

[0002] Nitrogen, with the chemical formula N2, is a colorless, odorless, chemically inactive gas. It accounts for about 78% of the total atmosphere of the earth and is one of the main components of air. The role of nitrogen is extensive and important. In the chemical industry, nitrogen is used as protective gas, replacement gas, washing gas, safety gas, etc.; in the electronics industry, high-purity nitrogen is an essential material for manufacturing semiconductors, integrated circuits and other electronic devices; in the food industry, nitrogen is used for food preservation and packaging to extend the shelf life of food. In addition, nitrogen is also used in many fields such as medical treatment and metal processing, and is an indispensable and important resource in modern society.

[0003] Through research and analysis, it was found that traditional nitrogen purification methods such as cryogenic separation and molecular sieve adsorption have problems such as high energy consumption, complex equipment, and difficult operation and maintenance, which restrict the further development of nitrogen purification technology; secondly, the membrane separation technology used in the existing technology is a new separation technology. With its high efficiency, environmental protection, and low energy consumption, it has shown great potential in the field of gas separation. However, when dealing with complex gas mixtures, single membrane separation technology often has problems such as poor separation effect and short membrane service life. Therefore, it is necessary to improve the shortcomings and defects of the existing technology. Utility Model Content

[0004] The purpose of the present invention is to provide a multi-stage membrane separation technology applied to an air nitrogen purification device to solve the problems raised in the background technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A multi-stage membrane separation technology is applied to an air nitrogen purification device, comprising: a frame, a pretreatment box is fixed on the upper side of the frame, an air storage tank and a nitrogen recovery tank are sequentially arranged on one side of the pretreatment box, a plurality of graded treatment tanks are arranged between the air storage tank and the nitrogen recovery tank, the output end of the pretreatment box is connected with the bottom of the air storage tank through a conduit 1, an air suction pump 1 is fixed on the conduit 1, the output end of the air storage tank is connected with the bottom of the graded treatment tank through a conduit 2, an air suction pump 2 is fixed on the conduit 2, two graded treatment tanks are connected through a conduit 3, a gas booster pump is fixed on the conduit 3, the graded treatment tank is connected with the nitrogen recovery tank through a conduit 4, an air suction pump 4 is fixed on the conduit 4, and a thermostat and a pressure gauge are respectively installed and fixed on the inner and outer sides of the graded treatment tank.

[0007] Furthermore, a box body is provided on the pretreatment box, the lower side of the box body is fixedly connected to the top of the frame, an induced draft fan is fixedly installed on one side of the input end of the box body, and filter plates and dehumidification plates are sequentially arranged in the induced draft fan along the air circulation direction.

[0008] Furthermore, the filter plate and the dehumidification plate are both embedded and fixed in the slots in the box body, the filter plate is used to filter dust and particulate matter in the air, and the dehumidification plate is filled with calcium oxide.

[0009] Furthermore, the grading treatment tank comprises an integrally formed outer shell and an inner liner, the inner liner is located inside the outer shell, a separation membrane is fixed to the inner side of the inner liner in a horizontal direction, and the pressure gauge is connected to the inner side of the inner liner through a connecting pipe.

[0010] Furthermore, the pore sizes of the separation membranes in the plurality of graded treatment tanks between the pretreatment box and the nitrogen recovery tank are gradually reduced, so as to achieve step-by-step purification of the air.

[0011] Furthermore, the constant temperature device is provided with a liquid storage box and a coil. The upper side of the liquid storage box is connected to the input end of the coil through an injection pipe, and the output end of the coil is connected to the liquid storage box through a discharge pipe. A liquid pump is installed and fixed on the injection pipe, and the coil is spirally fixed in a closed area composed of the outer shell and the inner tank.

[0012] Furthermore, the upper sides of the inner liner, the air storage tank and the nitrogen recovery tank are all preset with external discharge ports, and sealing covers are fixed on the external discharge ports.

[0013] Compared with the prior art, the utility model provides a multi-stage membrane separation technology applied to an air nitrogen purification device, which has the following beneficial effects:

[0014] In the utility model, by combining the multi-stage membrane separation technology and the constant temperature control device, the innovation of the air nitrogen purification device is realized. The device uses the separation membrane arranged in the multi-stage treatment tank to purify the nitrogen step by step under the action of different membrane pore sizes, thereby improving the purity and purification efficiency of the nitrogen; at the same time, by coordinating the adjustment of the gas booster pump and the pressure gauge, the working pressure is optimized, the nitrogen permeation amount is further increased, and the nitrogen purification efficiency is improved. The application of the constant temperature device ensures the stability of the gas molecules at a constant temperature, promotes the nitrogen permeation process, and maintains the performance of the membrane, thereby achieving the purpose of improving the nitrogen purity and purification efficiency while ensuring the stability and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view structural diagram of a multi-stage membrane separation technology proposed in the utility model applied to an air nitrogen purification device;

[0016] Figure 2 This is a schematic diagram of the top view of the structure of a multi-stage membrane separation technology proposed in the utility model applied to an air nitrogen purification device;

[0017] Figure 3 This is a rear view structural schematic diagram of a multi-stage membrane separation technology proposed in the utility model applied to an air nitrogen purification device;

[0018] Figure 4 This is a schematic cross-sectional view of a pretreatment box of an air nitrogen purification device using a multi-stage membrane separation technology proposed in the utility model;

[0019] Figure 5 This is a schematic cross-sectional structure diagram of a grading treatment tank in an air nitrogen purification device using a multi-stage membrane separation technology proposed in the utility model.

[0020] In the figure: 1. rack; 10. duct one; 11. suction pump one; 12. duct two; 13. suction pump two; 14. duct three; 15. gas booster pump; 16. duct four; 17. suction pump four; 2. pretreatment box; 21. box body; 22. induced draft fan; 23. filter plate; 24. dehumidification plate; 25. slot; 3. air storage tank; 4. nitrogen recovery tank; 5. graded treatment tank; 51. outer shell; 52. liner; 53. separation membrane; 6. constant temperature device; 61. liquid storage box; 62. injection pipe; 63. liquid pump; 64. discharge pipe; 65. coil; 7. pressure gauge; 8. external outlet. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] Embodiment 1:

[0024] Reference Figure 1-5A multi-stage membrane separation technology is applied to an air nitrogen purification device, comprising: a frame 1, characterized in that a pretreatment box 2 is fixed on the upper side of the frame 1, an air storage tank 3 and a nitrogen recovery tank 4 are sequentially arranged on one side of the pretreatment box 2, a plurality of graded treatment tanks 5 are arranged between the air storage tank 3 and the nitrogen recovery tank 4, the output end of the pretreatment box 2 is connected with the bottom of the air storage tank 3 through a conduit 10, an air suction pump 11 is fixed on the conduit 10, the output end of the air storage tank 3 is connected with the bottom of the graded treatment tank 5 through a conduit 2 12, an air suction pump 2 13 is fixed on the conduit 2 12, the two graded treatment tanks 5 are connected through a conduit 3 14, a gas booster pump 15 is fixed on the conduit 3 14, the graded treatment tank 5 and the nitrogen recovery tank 4 are connected through a conduit 4 16, an air suction pump 4 17 is fixed on the conduit 4 16, and a constant temperature device 6 and a pressure gauge 7 are respectively installed and fixed on the inner and outer sides of the graded treatment tank 5.

[0025] like Figure 4 As shown, a box body 21 is provided on the pretreatment box 2, and the lower side of the box body 21 is fixedly connected to the top of the frame 1. An induced draft fan 22 is fixedly installed on one side of the input end of the box body 21. A filter plate 23 and a dehumidification plate 24 are sequentially arranged in the induced draft fan 22 along the air flow direction.

[0026] like Figure 4 As shown, the filter plate 23 and the dehumidification plate 24 are both embedded and fixed in the slots 25 in the box body 21. The filter plate 23 is used to filter dust and particulate matter in the air, and the dehumidification plate 24 is filled with calcium oxide.

[0027] Embodiment 2:

[0028] The difference between this embodiment and embodiment 1 is that:

[0029] like Figure 5 As shown, the classification treatment tank 5 includes an integrally formed outer shell 51 and an inner liner 52. The inner liner 52 is located in the outer shell 51. A separation membrane 53 is fixed to the inner side of the inner liner 52 in the horizontal direction. The pressure gauge 7 is connected to the inner side of the inner liner 52 through a connecting pipe.

[0030] like Figure 5 As shown, the pore sizes of the separation membranes 53 in the plurality of graded treatment tanks 5 between the pretreatment box 2 and the nitrogen recovery tank 4 are gradually reduced, so as to achieve step-by-step purification of the air.

[0031] like Figure 2 , Figure 5As shown, the constant temperature device 6 is provided with a liquid storage tank 61 and a coil 65. The upper side of the liquid storage tank 61 is connected to the input end of the coil 65 through an injection pipe 62, and the output end of the coil 65 is connected to the liquid storage tank 61 through a discharge pipe 64. A liquid pump 63 is fixedly installed on the injection pipe 62, and the coil 65 is spirally fixed in the closed area composed of the outer shell 51 and the inner tank 52.

[0032] like Figure 1 As shown, an external discharge port 8 is preset on the upper side of the inner liner 52 and the air storage tank 3 and the nitrogen recovery tank 4, and a sealing cover is fixed on the external discharge port 8.

[0033] Working principle: When the utility model is in working state, the induced draft fan 22 on the pretreatment box 2 is started to absorb external air into the box body 21, and the dust and particulate matter in the air can be filtered and removed through the filter plate 23. Then, when the filtered air passes through the dehumidification plate 24, the calcium oxide on the dehumidification plate 24 can react and absorb the water vapor in the air with part of the carbon dioxide gas. It should be noted that since the filter plate 23 and the dehumidification plate 24 are embedded in the preset card slot 25 in the box body 21, they are of detachable design, which facilitates the operator to clean and replace the filter plate 23 and the dehumidification plate 24 in time; starting the suction pump 11 can pump the filtered gas at the tail of the pretreatment box 2 into the air storage tank 3 through the conduit 10, and starting the suction pump 13 The air in the air storage tank 3 can be pumped into the classification treatment tank 5 through the conduit 2 12. When the air passes through the separation membrane 53 in the classification treatment tank 5, due to the different molecular diameters of different gases in the air, there are differences in solubility and diffusion coefficient in the separation membrane 53. Oxygen, carbon monoxide, carbon dioxide, water vapor and the like with smaller molecular diameters in the air quickly pass through the separation membrane 53 upward, while nitrogen with larger molecular diameters will be retained due to its low permeability, so that the nitrogen after extraction is retained at the bottom of the inner tank 52. Since the pore sizes of the separation membranes 53 in the multiple classification treatment tanks 5 are gradually reduced, the purification rate of nitrogen can be made higher and higher. Finally, the suction pump 4 17 is started to collect the finally purified nitrogen into the nitrogen recovery tank 4 through the conduit 4 16;

[0034] The gas booster pump 15 and the pressure gauge 7 provided between the multiple grading treatment tanks 5 can be used to adjust the working pressure between the grading treatment tanks 5 at each level during the nitrogen purification process. When the working pressure increases, the concentration difference of the gas molecules on both sides of the separation membrane 53 increases, so that the gas molecules have a higher driving force to pass through the membrane pores, which helps to increase the amount of nitrogen permeation in the membrane and improve the purification efficiency; on the contrary, reducing the working pressure can reduce the resistance of the gas molecules passing through the membrane pores, which is conducive to extending the service life of the separation membrane 53. At the same time, at a lower working pressure, the rate at which oxygen molecules pass through the membrane pores will also be reduced accordingly, thereby improving the purity of the nitrogen;

[0035] Starting the liquid pump 63 on the thermostatic device 6 can inject the thermostatic liquid in the liquid storage box 61 into the coil 65 through the injection pipe 62. The coil 65 has a spiral structure, which can ensure that the inner tank 52 is in a constant temperature state. Under a higher constant temperature state, the thermal motion speed of the gas molecules is accelerated, making it easier for the gas molecules to pass through the membrane pores, which helps to increase the penetration of nitrogen in the membrane and improve the purification efficiency. However, too high a temperature may cause thermal expansion or denaturation of the membrane material, affecting the separation performance of the membrane; on the contrary, at a lower temperature, the thermal motion speed of the gas molecules slows down, and the rate at which oxygen molecules pass through the membrane pores is reduced, which helps to improve the purity of the nitrogen. At the same time, low temperature can also reduce the physical and chemical changes of the membrane material and maintain the stability of the membrane; in summary, by precisely controlling the working pressure and temperature, the nitrogen purification efficiency and purity can be maximized while ensuring the stability and reliability of the device.

Claims

1. A multi-stage membrane separation technology is applied to an air nitrogen purification device, comprising: The frame (1) is characterized in that a pretreatment box (2) is fixed on the upper side of the frame (1), an air storage tank (3) and a nitrogen recovery tank (4) are arranged in sequence on one side of the pretreatment box (2), a plurality of graded treatment tanks (5) are arranged between the air storage tank (3) and the nitrogen recovery tank (4), the output end of the pretreatment box (2) is connected to the bottom of the air storage tank (3) through a conduit (10), an air suction pump (11) is fixed on the conduit (10), and the output end of the air storage tank (3) is connected to the bottom of the air storage tank (3) through a conduit (2). The second conduit (12) is connected to the bottom of the classification treatment tank (5), and an air suction pump (13) is fixed on the second conduit (12). The two classification treatment tanks (5) are connected through a third conduit (14), and a gas booster pump (15) is fixed on the third conduit (14). The classification treatment tank (5) and the nitrogen recovery tank (4) are connected through a fourth conduit (16), and an air suction pump (17) is fixed on the fourth conduit (16). A constant temperature device (6) and a pressure gauge (7) are respectively installed and fixed on the inner and outer sides of the classification treatment tank (5).

2. The multi-stage membrane separation technology according to claim 1 is applied to an air nitrogen purification device, characterized in that: The pretreatment box (2) is provided with a box body (21), the lower side of the box body (21) is fixedly connected to the top of the frame (1), an induced draft fan (22) is fixedly installed on one side of the input end of the box body (21), and a filter plate (23) and a dehumidification plate (24) are sequentially arranged in the induced draft fan (22) along the air circulation direction.

3. The multi-stage membrane separation technology according to claim 2 is applied to an air nitrogen purification device, characterized in that: The filter plate (23) and the dehumidification plate (24) are both embedded and fixed in the slots (25) in the box body (21); the filter plate (23) is used to filter dust and particulate matter in the air; and the dehumidification plate (24) is filled with calcium oxide.

4. The multi-stage membrane separation technology according to claim 1 is applied to an air nitrogen purification device, characterized in that: The classification treatment tank (5) comprises an integrally formed outer shell (51) and an inner liner (52); the inner liner (52) is located inside the outer shell (51); a separation membrane (53) is fixed to the inner side of the inner liner (52) in a horizontal direction; and the pressure gauge (7) is connected to the inner side of the inner liner (52) via a connecting pipe.

5. The multi-stage membrane separation technology according to claim 4 is applied to an air nitrogen purification device, characterized in that: The pore sizes of the separation membranes (53) in the plurality of graded treatment tanks (5) between the pretreatment box (2) and the nitrogen recovery tank (4) are gradually reduced, so as to achieve step-by-step purification of the air.

6. The multi-stage membrane separation technology according to claim 4 is applied to an air nitrogen purification device, characterized in that: The thermostatic device (6) is provided with a liquid storage box (61) and a coil (65). The upper side of the liquid storage box (61) is connected to the input end of the coil (65) via an injection pipe (62), and the output end of the coil (65) is connected to the liquid storage box (61) via a discharge pipe (64). A liquid pump (63) is fixedly mounted on the injection pipe (62), and the coil (65) is spirally fixed in a closed area formed by the outer shell (51) and the inner tank (52).

7. The multi-stage membrane separation technology according to claim 4 is applied to an air nitrogen purification device, characterized in that: The inner container (52), the air storage tank (3) and the nitrogen recovery tank (4) are all provided with an external discharge port (8) on their upper sides, and a sealing cover is fixed on the external discharge port (8).

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