Helium recovery and purification structure for chemical safety production

Abstract

The invention discloses a helium recovery and purification structure for chemical safety production, and belongs to the field of efficient activated carbon purification, the helium recovery and purification structure comprises an equipment shell and a gas inlet pipe mounted at the bottom of the equipment shell and used for inputting helium, and the helium in the gas inlet pipe penetrates through an activated carbon net in the equipment shell and is discharged from a discharge outlet in the upper half section of the equipment shell; a low-temperature mechanism is further arranged in the equipment shell, a cold flow pipe is arranged in the low-temperature mechanism to reduce the working temperature of the activated carbon net, and meanwhile, the low-temperature mechanism rotates below the activated carbon net, so that the low-temperature uniformity is improved, and the activated carbon net is driven to vibrate at low frequency. According to the helium recovery and purification structure for chemical safety production, the working temperature of the activated carbon net and the initial temperature of helium before filtration are reduced in a mode of introducing cold fluid, efficiency improvement and moisture removal of the activated carbon net are realized in this way, and the overall recovery and purification efficiency of helium is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, specifically to a helium recovery device based on high-efficiency activated carbon filtration, and more specifically to a helium recovery and purification structure for safe chemical production. Background Technology

[0002] Helium, a high-value rare gas, is commonly used in cryogenic experiments, semiconductor manufacturing, and gas-shielded welding. Direct emission of helium not only causes economic losses but also pollutes the atmosphere due to its impurities. Therefore, recycling and purification can significantly reduce economic costs. For example, a helium recovery and purification device (publication number CN220003471U) relates to the field of helium recovery and purification equipment technology. It includes a base plate with a fixing groove on one side of its top. A caster wheel is rotatably mounted inside the fixing groove. A fixing box is fixedly mounted on the top of the caster wheel. A partition is fixedly mounted inside the fixing box. A base is slidably mounted inside the fixing box. A placement groove is fixedly mounted on the top center of the base. A spring is fixedly mounted on the bottom of the base. Clamping plates are slidably mounted at both ends of the top of the fixing box. This application, through the setting of casters, a fixed box, and a pallet, allows the helium-loading device to be fixed inside the fixed box by the pallet, preventing it from shaking during transportation and causing unstable internal pressure. The casters can move the helium-loading device, making it easy to move the helium-loading device to the filtration and recovery device.

[0003] For example, prior art publication CN118987882A discloses a combined heating and cooling activated carbon adsorber and its usage method for helium purification, comprising a reaction bed cylinder, a multi-layer metal heat shield, and a double-layer liquid nitrogen insulated tank; the reactor cylinder is encased in a multi-layer metal heat shield, which is placed inside the double-layer liquid nitrogen insulated tank; the reactor cylinder contains a spiral guide plate, and activated carbon packing is loaded along the spiral guide plate; an armored heater is welded to the middle of the spiral guide plate; a lower filter plate and a higher filter plate are respectively installed in the upper and lower parts of the reactor cylinder. This application utilizes the different adsorption properties of activated carbon for impurity gases in helium at low temperatures to achieve the adsorption of gases with lower condensation points.

[0004] The aforementioned existing technologies achieve good technical results by filtering helium gas from the perspectives of equipment docking and the use of high-efficiency activated carbon. However, they still have certain shortcomings. After use, helium gas is prone to contain a certain amount of moisture and initial heat due to the influence of the usage environment and the loss of sealing during the recycling process. The adsorption efficiency of high-efficiency activated carbon is inversely proportional to the working temperature. At high temperatures, the equilibrium shifts towards desorption. The lower the temperature, the larger the adsorption equilibrium constant, and the more gas a unit mass of activated carbon can adsorb. Therefore, it is necessary to keep the high-efficiency activated carbon in a relatively low-temperature working environment and treat the water vapor simultaneously. Summary of the Invention

[0005] The purpose of this invention is to provide a helium recovery and purification structure for safe chemical production, so as to solve the problems existing in the prior art mentioned in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a helium recovery and purification structure for chemical safety production, comprising an equipment shell and an inlet pipe installed at the bottom of the equipment shell for inputting helium. The helium in the inlet pipe passes through an activated carbon mesh in the equipment shell and is discharged from the exhaust port in the upper half of the equipment shell. The equipment shell is also provided with a cryogenic mechanism, which has a built-in cold flow pipe to reduce the working temperature of the activated carbon mesh. At the same time, the cryogenic mechanism rotates below the activated carbon mesh, thereby improving the uniformity of low temperature and driving the activated carbon mesh to vibrate at low frequency.

[0007] As a further step, the cryogenic mechanism includes a rotatably mounted receptacle inside the equipment housing, the receptacle having a hollow internal structure for accommodating the middle section of the cold flow tube, and the rotation of the receptacle not interfering with the cold flow tube.

[0008] As a further step, the input and output ends of the cold flow tube both pass through the top opening of the housing and the internal hollow structure of the rotating shaft, extending and being fixed to the outside of the equipment housing, wherein the housing is connected to the motor output shaft located at the top of the equipment housing via the rotating shaft.

[0009] As a further step, the cross-sectional area of ​​the container is smaller than the surface area of ​​the activated carbon mesh, while the activated carbon mesh is sealed and penetrated by the rotating shaft in the vertical direction.

[0010] As a further step, the lower end face of the activated carbon mesh is fitted with magnetic strips distributed at equal angles, which are used to adsorb metal powder in helium gas.

[0011] As a further step, another set of magnetic strips is installed on the upper surface of the container. These magnetic strips, along with the magnetic strips installed on the lower end face of the activated carbon mesh, are intermittently distributed vertically during the rotation of the container, and the two adjacent sets of magnetic strips are arranged to repel each other.

[0012] As a further step, the top end of the air intake pipe is connected to the vertical rod, and the top end of the vertical rod is equipped with a guide rod with its outer end inclined downward. A nozzle is installed on the upper end face of the guide rod, and the nozzle is connected to the air intake pipe through the guide rod and the air chamber in the vertical rod.

[0013] As a further step, the lower end face of the container is an inverted bowl shape, and the inclined surface is parallel to the guide rod provided below it. Moreover, a scraper is installed at the edge of the upper end face of the guide rod. The top of the scraper is in contact with the lower end face of the container, and the height of the scraper is higher than the height of the adjacent nozzle.

[0014] As a further step, the bottom end of the guide rod extends outside the coverage area of ​​the container, wherein a collection hole is provided on the upper surface of the bottom end of the guide rod, and the condensate collected by the collection hole is discharged to the outside of the equipment housing through a vertical pipe connected to its bottom end.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the helium recovery and purification structure for chemical safety production reduces the working temperature of the activated carbon mesh and the initial temperature before helium filtration by introducing a cold fluid. In this way, the efficiency of the activated carbon mesh and the removal of water vapor are improved, effectively improving the overall helium recovery and purification efficiency, as shown in the following details.

[0016] 1. First, a container is designed in the device as the housing structure for the cold flow tube. By controlling the cold flow inside the cold flow tube from outside the device, the container is kept at a low temperature. The container is also designed to fit the activated carbon filter screen. The position of the cold flow tube passing through the filter screen is designed so that the filter screen itself can be kept at a relatively low temperature, avoiding the thermal effect that would reduce the adsorption rate and improving the filtration effect. Furthermore, by designing the container to be rotatable, the magnetic strip on the upper surface of the container rotates synchronously. This utilizes the principle of magnetic repulsion to allow the core of the activated carbon filter located above it to be in a low-frequency vibration state, thereby preventing the activated carbon in the filter from self-tightening and achieving better performance.

[0017] 2. Based on the rotatable container, the lower end face of the container is designed as a concave bowl-shaped structure. With the help of vertical rods and guide rods to guide the flow of helium, the helium can fully contact the lower end face of the container, thereby allowing the water vapor in the helium to condense and precipitate out. This reduces the water content of the helium, thereby reducing the filtration burden on the activated carbon mesh and improving the equipment life. At the same time, the condensate can be removed by rotation, making the design more reasonable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the internal structure of the device casing; Figure 3 This is a schematic diagram of the structure of the container and the activated carbon mesh after separation. Figure 4 This is a bottom view of the activated carbon mesh structure of the present invention; Figure 5 This is a schematic diagram of the distribution structure of the cold flow tubes inside the container body according to the present invention; Figure 6 This is a schematic diagram of the internal structure of Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the guide rod distribution structure of the present invention; Figure 8 This is a schematic diagram of the longitudinal cross-sectional structure of the container of the present invention; Figure 9 This is a schematic diagram of the longitudinal section structure of the vertical rod and guide rod of the present invention.

[0019] In the diagram: 1. Equipment casing; 2. Air inlet pipe; 3. Activated carbon mesh; 4. Cold flow pipe; 5. Container; 6. Rotating shaft; 7. Magnetic strip; 8. Vertical rod; 9. Guide rod; 10. Nozzle; 11. Scraper; 12. Collection hole; 13. Vertical pipe; 14. Air chamber. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-9 The present invention provides the following technical solution: Example 1: The solution disclosed in this example is intended to solve the problems existing in the prior art, such as... Figures 1-2As shown, the purification structure includes a housing 1 and an inlet pipe 2 installed at the bottom of the housing 1 for inputting helium gas. The helium gas in the inlet pipe 2 passes through the activated carbon mesh 3 in the housing 1 and is discharged from the exhaust port in the upper half of the housing 1. The housing 1 also has a cryogenic mechanism with a built-in cold flow pipe 4 to reduce the working temperature of the activated carbon mesh 3. The cryogenic mechanism rotates below the activated carbon mesh 3 to improve the uniformity of the cryogenic temperature and drive the activated carbon mesh 3 to vibrate at a low frequency. The cryogenic mechanism includes a container 5 rotatably installed inside the housing 1. The hollow structure inside the container 5 is used to accommodate the middle section of the cold flow pipe 4, and the rotation of the container 5 does not interfere with the cold flow pipe 4. The input and output ends of the cold flow pipe 4 pass through the top opening of the container 5 and the hollow structure inside the rotating shaft 6, extending and being fixed to the outside of the housing 1. The container 5 is connected to the motor output shaft located at the top of the housing 1 via the rotating shaft 6. The cross-sectional area of ​​the container 5 is smaller than the surface area of ​​the activated carbon mesh 3, and the activated carbon mesh 3 is sealed by the rotation of the rotating shaft 6 in the vertical direction. Helium gas is normally introduced into the equipment casing 1 through the lower inlet pipe 2, and discharged from the upper exhaust pipe after passing through the activated carbon mesh 3. During this process, a large amount of rising helium gas will come into contact with the cryogenic mechanism, namely the container 5. Therefore, the chlorine gas, which is initially at room temperature or high temperature, will be cooled accordingly. Moreover, since the container 5 is close to the activated carbon mesh 3, and the cold source delivery channel also passes through the filter screen, the working temperature of the filter screen will be reduced accordingly, thereby improving the adsorption efficiency of the activated carbon for impurities in the helium gas. Furthermore, the container 5 is installed in a rotating manner. Driven by a motor drive structure installed at the top of the equipment casing 1, the drive method is bevel gear transmission, etc. The rotating shaft 6 will drive the container 5 to rotate. The hollow structure in the container 5 and the rotating shaft 6 is used to accommodate and rotate the cold flow pipe 4. The upper half of the cold flow pipe 4 is installed in the equipment casing 1 in a relatively fixed manner. Therefore, the cold flow pipe 4 will work normally without being affected when the container 5 rotates. After sufficient heat exchange, the container 5 will also evenly affect the activated carbon mesh 3 through rotation, thereby improving the treatment effect.

[0022] The additional solution disclosed in this embodiment further generates a vibration effect through rotation. Vibration within a limited amplitude can also, to some extent, address the gradual self-tightening of activated carbon particles caused by gas escape, thereby preventing a decrease in porosity. Specifically, as shown... Figures 3-5As shown, the lower end face of the activated carbon mesh 3 is equipped with magnetic strips 7 distributed at equal angles. These magnetic strips 7 are used to adsorb metal powder in helium gas. Another set of magnetic strips 7 is installed on the upper surface of the container 5. These magnetic strips 7 and the magnetic strips 7 installed on the lower end face of the activated carbon mesh 3 are intermittently distributed vertically during the rotation of the container 5, and the two adjacent sets of magnetic strips 7 are arranged to repel each other. As the rotating shaft 6 drives the container 5 to rotate, the magnetic strips 7 installed on its upper end face will rotate synchronously. When the lower magnetic strip 7 rotates to be perpendicular to the upper magnetic strip 7 installed on the lower end face of the activated carbon mesh 3, The repulsive force between the upper and lower sets of magnetic strips 7 will cause the activated carbon mesh 3, which is already elastically slidably installed, to move vertically by a small amplitude. In the device housing 1, the activated carbon mesh 3 can be vertically elastically slidably installed in the device housing 1 as a whole, or the outer frame of the filter screen can be fixed in the device housing 1, while the inner filter element can be vertically elastically slidably installed in the outer frame. This will not be further elaborated here. At the same time, the magnetic strips 7 will also absorb any metal powder that may be present in the helium gas. As for cleaning the metal powder, the device housing 1 can be opened periodically for manual cleaning.

[0023] Example 2: The solution disclosed in this example is an extension of the principle that the container 5 can rotate. On one hand, it allows the high-temperature helium gas to directly contact the low-temperature container 5, preventing helium gas containing a large amount of water vapor from directly contacting the activated carbon mesh 3 from the edge of the container 5. On the other hand, it effectively cleans the generated condensate, preventing it from remaining in the equipment casing 1 and affecting subsequent purification and recycling. Specifically, as shown... Figures 6-9As shown, the top end of the air inlet pipe 2 is connected to the vertical rod 8. A guide rod 9 with its outer end inclined downward is installed at the top end of the vertical rod 8. A nozzle 10 is installed on the upper end face of the guide rod 9. The nozzle 10 is connected to the air inlet pipe 2 through the guide rod 9 and the air chamber 14 in the vertical rod 8. The lower end face of the container 5 is an inverted bowl shape, and the inclined surface is parallel to the guide rod 9 installed below it. A scraper 11 is installed at the edge of the upper end face of the guide rod 9. The top end of the scraper 11 is in contact with the lower end face of the container 5, and the height of the scraper 11 is higher than the height of the adjacent nozzle 10. The bottom end of the guide rod 9 extends outside the coverage area of ​​the container 5. A collection hole 12 is opened on the upper surface of the bottom end of the guide rod 9. The condensate collected by the collection hole 12 is discharged to the outside of the equipment housing 1 through the vertical pipe 13 connected to its bottom end. Unlike the first embodiment, the latter half of the helium gas is guided to flow. The process takes place in the vertical rod 8, then enters the interior of the guide rod 9, and finally sprays out from the nozzle 10 installed on the surface of the guide rod 9 toward the container 5. Since the lower end face of the container 5 is designed with a concave center and a downward drooping edge, the airflow sprayed from the nozzle 10 will directly hit the upper part of the surface of the container 5, and after sufficient contact and flow, it will escape from the edge of the container 5. At the same time, since the container 5 itself is in a rotating state, the low temperature of its surface will more evenly and fully exchange heat with the continuously sprayed helium, and the water vapor will also fully condense. Since the container 5 is in a rotating state, the scraper 11 will also have the effect of scraping off the condensate, and after flowing, it will be discharged from the collection hole 12 and the vertical pipe 13. In order to avoid helium leakage, the vertical pipe 13 can be designed with a valve control scheme to discharge the condensate at regular intervals.

[0024] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A helium recovery and purification structure for safe chemical production, comprising an equipment housing (1) and an inlet pipe (2) installed at the bottom of the equipment housing (1) for inputting helium, wherein the helium in the inlet pipe (2) passes through an activated carbon mesh (3) in the equipment housing (1) and is discharged from an outlet in the upper half of the equipment housing (1), characterized in that: The device housing (1) is also provided with a low-temperature mechanism, which has a built-in cold flow tube (4) to reduce the working temperature of the activated carbon mesh (3). At the same time, the low-temperature mechanism rotates below the activated carbon mesh (3) to improve the uniformity of low temperature and drive the activated carbon mesh (3) to vibrate at low frequency.

2. The helium recovery and purification structure according to claim 1, characterized in that: The cryogenic mechanism includes a container (5) rotatably mounted inside the equipment housing (1), the hollow structure of which is used to accommodate the middle section of the cold flow tube (4), and the rotation of the container (5) does not interfere with the cold flow tube (4).

3. The helium recovery and purification structure according to claim 2, characterized in that: The input and output ends of the cold flow tube (4) pass through the top opening of the container (5) and the internal hollow structure of the rotating shaft (6), extending and being fixed to the outside of the equipment housing (1). The container (5) is connected to the motor output shaft located at the top of the equipment housing (1) through the rotating shaft (6).

4. The helium recovery and purification structure according to claim 3, characterized in that: The cross-sectional area of ​​the container (5) is smaller than the surface area of ​​the activated carbon mesh (3), while the activated carbon mesh (3) is rotated and sealed through by the shaft (6) in the vertical direction.

5. The helium recovery and purification structure according to claim 3, characterized in that: The lower end face of the activated carbon mesh (3) is equipped with magnetic strips (7) distributed at equal angles, which are used to adsorb metal powder in helium gas.

6. The helium recovery and purification structure according to claim 5, characterized in that: Another set of magnetic strips (7) is installed on the upper surface of the container (5). The magnetic strips (7) and the magnetic strips (7) installed on the lower end face of the activated carbon mesh (3) will be intermittently distributed vertically during the rotation of the container (5), and the two adjacent sets of magnetic strips (7) are set to repel each other.

7. The helium recovery and purification structure according to claim 3, characterized in that: The top end of the air intake pipe (2) is connected to the vertical rod (8). The top end of the vertical rod (8) is equipped with a guide rod (9) with its outer end inclined downward. The upper end face of the guide rod (9) is equipped with a nozzle (10). The nozzle (10) is connected to the air intake pipe (2) through the guide rod (9) and the air chamber (14) in the vertical rod (8).

8. The helium recovery and purification structure according to claim 7, characterized in that: The lower end face of the container (5) is an inverted bowl shape, and the inclined surface is parallel to the guide rod (9) provided below it. A scraper (11) is installed at the edge of the upper end face of the guide rod (9). The top of the scraper (11) is in contact with the lower end face of the container (5), and the height of the scraper (11) is higher than the height of the adjacent nozzle (10).

9. The helium recovery and purification structure according to claim 8, characterized in that: The bottom end of the guide rod (9) extends outside the coverage area of ​​the container (5), and a collection hole (12) is provided on the upper surface of the bottom end of the guide rod (9). The condensate collected by the collection hole (12) is discharged to the outside of the equipment housing (1) through the vertical pipe (13) connected to its bottom end.

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