Gas purification device

Abstract

The utility model discloses a gas purification device which comprises an outer purification pipe and an inner purification pipe, and a pure gas outlet is formed in a lower end cover of the outer purification pipe; the inner purification pipe is nested in the outer purification pipe, and a raw gas inlet is formed in the top end of an extension pipe of the inner purification pipe; the upper silk screen partition plate is mounted at the bottom end of an extension pipe of the inner purification pipe; the lower silk screen supporting partition plate is installed below the inner purification pipe, the flow guide pipe is provided with an air inlet end and an air outlet end, the air inlet end is communicated and connected with the lower end of the inner purification pipe, and the air outlet end penetrates through the upper silk screen partition plate and is arranged in a space between the upper silk screen partition plate and an upper end cover of the outer purification pipe; the filter element is mounted between the lower silk screen supporting partition plate and the lower end cover; according to the utility model, the casing pipe combination is adopted, so that the catalyst filling has the optimal height-diameter ratio, and the gas path series connection mode is adopted, so that the equipment volume can be reduced, and the distance between functional towers can be shortened, thereby improving the purification efficiency to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of high-purity gas purification, specifically to a gas purification device. Background Technology

[0002] High-purity gases in laboratories mainly come from piped gas and cylinder gas. To ensure gas purity, high-purity gas purification equipment is usually installed in gas stations or cylinder rooms to increase the purity to over 99.9999%, and then the gas is transported to various points of use via pipelines. However, secondary contamination of pure gas by pipelines is a factor that cannot be ignored.

[0003] The impact of gas source quality on purity: Whether it is piped gas or cylinder gas, it is impossible to guarantee that the purity of the gas source will remain consistent over a relatively long period of time; there will always be some fluctuations.

[0004] The impact of the inner wall of the pipe on purity: Food-grade stainless steel pipes such as 304, 316 or 316L have an oxide layer on their inner wall. Because the oxide layer has a porous structure, it has adsorption properties and can adsorb a certain amount of impurities such as oxygen, water and carbon dioxide. These impurities cannot be completely removed by purging and will be slowly released, causing the gas purity to decrease or fluctuate.

[0005] The impact of pipeline micro-leakage on purity: Various pressure reducing valves, ball valves, pressure gauges, etc. in pipelines use compression fittings or threaded connections, which cannot guarantee zero leakage. Impurities such as oxygen and moisture in the air can diffuse into the pipeline through micro-pores. The more interfaces there are and the longer the service life, the greater the micro-leakage.

[0006] Currently, research institutes, universities, and enterprises generally adopt a layout scheme of centralizing various inert gases and special gases at gas stations, using centralized purification and decentralized use, and transmitting them to various gas usage points through pipelines. This inevitably leads to secondary pollution. Usually, the solution to this problem is to install a purifier nearby in the laboratory. However, conventional purifiers are large and occupy laboratory space. When there are multiple gases in the laboratory, it is very difficult to place multiple purifiers. In addition, they also have disadvantages such as high power consumption, heat radiation sources, regeneration emission of waste gas, valve noise, and high investment costs. Therefore, as the requirements for pure gas in laboratories become higher and higher, traditional purifiers are difficult to meet the needs. Utility Model Content

[0007] Based on this, the technical problem to be solved by this utility model is to provide a small-volume gas purification device that is small in size, easy to install, and equipped with a room-temperature high-efficiency refining agent, which can effectively solve the problem of secondary pollution of pure gas by transmission pipelines.

[0008] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0009] This utility model provides a gas purification device, including: an outer purification tube, an inner purification tube, an upper wire mesh partition, a lower wire mesh support partition, a guide tube, and a filter element. The outer purification tube is sealed with an upper end cap at the top and a lower end cap at the bottom, with the lower end cap having a pure gas outlet. The inner purification tube has a smaller diameter and height than the outer purification tube and is nested inside the outer purification tube. The top of the inner purification tube is narrowed and extended to form an extension tube, which extends through the upper end cap of the outer purification tube, with the top of the extension tube serving as the raw gas inlet. The upper wire mesh partition is installed on the outer purification tube... The bottom end of the extension tube of the inner purification tube is fitted between the inner wall of the outer purification tube and the outer wall of the inner purification tube; the lower wire mesh support partition is installed below the inner purification tube and is spaced a certain distance from the lower end cap of the outer purification tube; the guide tube has an air inlet end and an air outlet end, with the air inlet end at the bottom and the air outlet end at the top, the air inlet end being connected to the lower end of the inner purification tube, and the air outlet end penetrating the upper wire mesh partition and placed in the space between the upper wire mesh partition and the upper end cap of the outer purification tube; the filter element is installed between the lower wire mesh support partition and the lower end cap.

[0010] Raw gas enters the inner purification pipe through the raw gas inlet, then enters the outer purification pipe through the guide pipe, and finally exits from the pure gas outlet.

[0011] Furthermore, it also includes an inner wire mesh support partition, which is installed in the lower part of the inner purification tube.

[0012] Furthermore, the air inlet end of the guide pipe is located below the inner wire mesh support partition.

[0013] Furthermore, the filter element is arc-shaped and covers the pure gas outlet.

[0014] Furthermore, the raw gas inlet and pure gas outlet are equipped with compression fittings, threaded fittings, or quick-connect fittings.

[0015] Furthermore, the height-to-diameter ratio of the inner purification tube is between 1 and 20.

[0016] Furthermore, the volume ratio of the inner purification tube to the outer purification tube is 1:0.2 to 1:5.

[0017] Furthermore, the lower wire mesh support partition includes multiple support legs and a wire mesh partition. The wire mesh partition is composed of an upper screen plate, multiple layers of wire mesh, and a lower screen plate arranged sequentially from top to bottom. The upper screen plate and the lower screen plate are uniformly provided with screen holes, and the screen hole diameter is larger than the wire mesh diameter.

[0018] Furthermore, the inner purification tube is filled with packing material.

[0019] Furthermore, filler is installed in the outer purification pipe between the upper and lower wire mesh partitions.

[0020] Advantages and beneficial effects of this utility model:

[0021] 1. The advantage of this utility model is that the outer purification tube and the inner purification tube can be filled with two kinds of refined agents respectively, which facilitates the implementation of graded and series purification processes in gas purification.

[0022] 2. The advantage of this utility model is that it achieves three-stage purification. The raw gas first enters the inner purification tube to complete the first stage of purification, and then enters the outer purification tube under the action of the guide tube to complete the second stage of purification. The pure gas passes through the filter element to complete the third stage of purification.

[0023] 3. The advantage of this utility model is that the gas flow direction in the outer purification tube and the inner purification tube is always from top to bottom, which avoids the boiling and peristalsis of the refining agent due to the airflow, reduces the powdering of the refining agent due to peristalsis and friction, and thus extends its service life.

[0024] 4. The advantage of this utility model is that the raw gas first passes through the inner purification pipe and then enters the outer purification pipe. When the inner purification pipe generates reaction heat, it will be carried by the airflow to the outer purification pipe, which is more conducive to heat dissipation through the outer purification pipe cylinder.

[0025] 5. The advantage of this utility model is that the air outlet end of the guide pipe is bent towards the central axis of the pipe and arranged along a concentric circle tangent on the cross-section of the upper uniformly distributed space, so that the airflow will rotate and mix after entering the upper uniformly distributed space, and the airflow distribution is more uniform when passing through the upper uniformly distributed space, avoiding dead zone space.

[0026] 6. The advantage of this utility model is that the lower wire mesh support partition is welded to the bottom of the inner purification tube, which can enhance the stability of the inner purification tube. The lower uniformly distributed space formed by it can make the airflow evenly distributed on the filter element.

[0027] 7. The advantage of this utility model is that both the raw gas inlet and the pure gas outlet are easy-to-disassemble interfaces, such as ferrule interfaces, clamp interfaces, threaded interfaces, quick-connect interfaces, etc., which facilitates quick replacement of the purification device. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] Figure 2 This is a schematic diagram of the outlet end of the uniformly distributed space guide pipe.

[0030] Figure 3a This is the front view of the upper wire mesh partition;

[0031] Figure 3b for Figure 3a Top view.

[0032] Figure 4a Main view of the lower wire mesh support partition;

[0033] Figure 4b for Figure 4a Top view.

[0034] Marked in the image:

[0035] 1. Raw gas inlet; 2. Upper end cap; 3. Gas outlet; 4. Upper wire mesh baffle; 5. External purification pipe; 6. Guide pipe; 7. Internal purification pipe; 8. Internal wire mesh support baffle; 9. Inlet end; 10. Uniformly distributed space of internal purification pipe; 11. Lower end cap; 12. Pure gas outlet; 13. Filter element; 14. Lower uniformly distributed space; 15. Lower wire mesh support baffle; 16. Packing space of external purification pipe; 17. Packing space of internal purification pipe; 18. Upper uniformly distributed space; 19. Extension pipe; 15-1 Upper sieve plate; 15-3 Wire mesh; 15-2 Lower sieve plate; 15-4 Support foot; 4-1 Upper annular sieve plate; 4-2 Lower annular sieve plate; 4-3 Annular wire mesh layer. Detailed Implementation

[0036] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings and relevant prior art, so that the advantages and features of this utility model can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this utility model. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] like Figure 1 As shown, a gas purification device of this utility model includes: an outer purification tube 5, an inner purification tube 7, an upper wire mesh partition 4, a lower wire mesh support partition 15, a guide tube 6, and a filter element 13.

[0038] The external purification tube 5 serves as the tower body of the purification device. The top of the external purification tube 5 is sealed with an upper end cap 2, and the bottom is sealed with a lower end cap 11. The lower end cap is provided with a pure gas outlet 12.

[0039] The inner purification pipe 7 has a smaller diameter and height than the outer purification pipe 5. The inner purification pipe 7 is nested within the outer purification pipe 5. The top of the inner purification pipe 7 is narrowed and extended to form an extension pipe 19, which protrudes from the upper end cap 2 of the outer purification pipe. The top of the extension pipe 19 is the raw gas inlet 1. The height-to-diameter ratio of the inner purification pipe is between 1 and 20. The volume ratio of the inner purification pipe to the outer purification pipe is between 1:0.2 and 1:5.

[0040] An inner wire mesh support partition 8 is installed in the lower part of the inner purification pipe. The inner wire mesh support partition 8 is composed of an upper screen plate, multiple layers of wire mesh, and a lower screen plate arranged sequentially from top to bottom. The space between the inner wire mesh support partition 8 and the bottom end of the inner purification pipe is the uniform distribution space 10 of the inner purification pipe. The height-to-diameter ratio of the uniform distribution space 10 of the inner purification pipe is between 0.2 and 2.

[0041] The upper wire mesh partition 4 is installed at the bottom end of the extension tube of the inner purification tube, and is clamped between the inner wall of the outer purification tube and the outer wall of the inner purification tube. For example... Figure 3a , Figure 3b As shown, the upper wire mesh partition 1 is annular, consisting of an upper annular screen plate 4-1, an annular wire mesh layer 4-3, and a lower annular screen plate 4-2 arranged sequentially from top to bottom.

[0042] The space between the upper wire mesh partition 4 and the upper end cover 2 is an upper uniformly distributed space 18, and the height-to-diameter ratio of the upper uniformly distributed space is between 0.2 and 2.

[0043] like Figure 4a , Figure 4b As shown, the lower wire mesh support partition includes multiple support legs 15-4 and a wire mesh partition. The wire mesh partition is composed of an upper screen plate 15-1, multiple layers of wire mesh 15-3, and a lower screen plate 15-2 arranged sequentially from top to bottom. The upper and lower screen plates are uniformly perforated with sieve holes, the hole diameter of which is larger than the mesh diameter. The upper screen plate is concentrically welded to the lower part of the inner purification pipe, and the lower screen plate is welded with support legs.

[0044] Preferably, the upper and lower screen plates of the lower wire mesh support partition are both stainless steel plates with a specification of φ70×2mm, and are covered with round holes with a specification of φ2~10mm, and the flow area is not less than 30%. The multi-layer wire mesh has a specification of 20~100 mesh (preferably 10~100 mesh) and a stack thickness of about 0.5~2mm. In this embodiment, the preferred specification is 80 mesh with a stack thickness of 1mm.

[0045] The lower wire mesh support partition 15 is installed below the inner purification pipe and is spaced a certain distance from the lower end cap of the outer purification pipe; the space between the lower wire mesh support partition and the lower end cap of the outer purification pipe is the lower uniformly distributed space 14. The height-to-diameter ratio of the lower uniformly distributed space 14 is between 0.2 and 2.

[0046] The function of the lower wire mesh support partition is threefold: first, to isolate a space as a lower uniform distribution space; second, to fix the inner purification tube; and third, to support the catalyst packing in the outer purification tube.

[0047] The guide pipe 6 has an air inlet end 9 and an air outlet end 3, with the air inlet end at the bottom and the air outlet end at the top. The air inlet end is connected to the lower end of the inner purification pipe, and the air outlet end penetrates the upper wire mesh partition and is placed in the upper uniformly distributed space 18 between the upper wire mesh partition and the upper end cap of the outer purification pipe. The air inlet end of the guide pipe is located in the uniformly distributed space 10 of the inner purification pipe below the inner wire mesh support partition. The air outlet end of the guide pipe is bent towards the central axis of the pipe and arranged along a concentric tangent line on the cross-section of the upper uniformly distributed space.

[0048] Raw gas enters the inner purification pipe through the raw gas inlet, then enters the outer purification pipe through the guide pipe, and finally exits from the pure gas outlet.

[0049] The filter element 13 is installed between the lower wire mesh support partition and the lower end cap, with a filtration accuracy of less than 1 micrometer. The filter element is arc-shaped and covers the pure gas outlet. Preferably, the filter element has a semi-open structure, such as a semi-open cylindrical shape, a hemispherical shell shape, a semi-elliptical shell shape, etc. In this embodiment, the preferred specification is a semi-elliptical shell shape, with dimensions of approximately φ50×20mm, a thickness of 2~6mm, and a filtration accuracy of 1μm.

[0050] To facilitate disassembly, the raw gas inlet and pure gas outlet are equipped with compression fittings, threaded fittings, quick-connect fittings, welded fittings, etc. Different fitting types are selected according to different applications to meet pressure resistance requirements and ensure airtightness and replaceability.

[0051] The inner purification tube contains the inner purification tube packing space 17, and the outer purification tube between the upper wire mesh partition and the lower wire mesh partition contains the outer purification tube packing space 16.

[0052] Preferably, the pipe materials in this embodiment are all 316L stainless steel clean pipes, and the selected pipe specifications, such as pipe diameter, thickness, and height, are optimized based on the gas type, raw gas index, and treatment index.

[0053] Preferably, this embodiment operates at a pressure of 0.5 MPa and a gas processing capacity of 2 Nm³. 3 The design uses 316L stainless steel pipes with the following specifications: the outer purification pipe has a diameter of φ76×3×360mm, the inner purification pipe has a diameter of φ45×1×300mm, the guide pipe has a diameter of φ4×0.5mm, the upper uniform distribution space is 25mm high, and the lower uniform distribution space is 35mm high.

[0054] Application Example 1

[0055] A room temperature hydrogen purification device

[0056] The purification column of this embodiment can purify various gases by filling it with different refining agents. In this embodiment, the inner purification tube is filled with a deoxygenation catalyst and getter, which can catalyze oxygen in hydrogen into water or other oxides. The outer purification tube is filled with adsorbents of various specifications, which can adsorb water, carbon dioxide, and some hydrocarbons.

[0057] Testing revealed that using high-purity hydrogen conforming to GB / T 3634.2-2011 Part 2: Pure Hydrogen, High-Purity Hydrogen and Ultra-Purity Hydrogen, with a purity index of 99.999%, as the raw gas in this embodiment, the output pure gas, after purification by the apparatus of this embodiment, reached the ultra-pure hydrogen index, i.e., a purity of 99.9999%. No dust particles ≥1μm were detected in the pure gas.

[0058] Application Example 2

[0059] A room-temperature nitrogen, argon, and helium purification device

[0060] Nitrogen, argon, and helium are all chemically inert gases. In routine laboratory testing, a purity of 6N is generally sufficient; therefore, a purification column can be used. When filling the refining agent, the catalyst ratio can be adjusted according to the user's specific needs to meet the requirements.

[0061] In this embodiment, the purification column is filled with metal oxide dehydrogenation and deoxygenation catalysts, getters, etc., which can convert impurity gases such as hydrogen, oxygen, carbon monoxide, methane and hydrocarbons into water, carbon dioxide or be adsorbed in the form of oxides. The outer purification column is filled with adsorbents of various specifications, which can adsorb water, carbon dioxide and some hydrocarbons.

[0062] Testing revealed that high-purity nitrogen, meeting the requirements for high-purity gas in GB / T 8979-2008 (pure nitrogen, high-purity nitrogen, and ultrapure nitrogen), with a purity of 99.999%, was used as the raw gas in this embodiment. After purification by the apparatus in this embodiment, the output pure gas reached the ultrapure nitrogen standard, i.e., a purity of 99.9999%. No dust particles ≥1μm were detected in the pure gas.

[0063] Although the present invention has been described according to the specific embodiments above, the inventive concept of the present invention is not limited to this invention. Any modifications that utilize the inventive concept will be included within the scope of protection of this patent.

Claims

1. A gas purification device, characterized in that, include: An external purification tube, wherein the top of the external purification tube is sealed with an upper end cap and the bottom is sealed with a lower end cap, and the lower end cap is provided with a pure gas outlet; The inner purification tube is smaller in diameter and height than the outer purification tube. The inner purification tube is nested inside the outer purification tube. The top of the inner purification tube is narrowed and extended to form an extension tube. The extension tube passes through the upper end cap of the outer purification tube, and the top of the extension tube is the raw gas inlet. The upper wire mesh partition is installed at the bottom end of the extension tube of the inner purification tube and is clamped between the inner wall of the outer purification tube and the outer wall of the inner purification tube. The lower wire mesh support partition is installed below the inner purification pipe and is spaced a certain distance from the lower end cap of the outer purification pipe to form a lower uniformly distributed space. The guide tube has an air inlet end and an air outlet end, with the air inlet end at the bottom and the air outlet end at the top. The air inlet end is connected to the lower end of the inner purification tube, and the air outlet end penetrates the upper wire mesh partition and is placed in the upper evenly distributed space between the upper wire mesh partition and the upper end cap of the outer purification tube. A filter element is installed between the lower wire mesh support partition and the lower end cover. Raw gas enters the inner purification pipe through the raw gas inlet, then enters the outer purification pipe through the guide pipe, and finally exits from the pure gas outlet.

2. The gas purification apparatus according to claim 1, characterized in that, It also includes an inner wire mesh support partition, which is installed in the lower part of the inner purification tube. The space between the inner wire mesh support partition and the bottom end of the inner purification tube is the uniform distribution space of the inner purification tube.

3. The gas purification apparatus according to claim 2, characterized in that, The air inlet of the guide pipe is located in the space where the inner purification pipes are evenly distributed below the inner wire mesh support partition.

4. The gas purification apparatus according to claim 1, characterized in that, The filter element is arc-shaped and covers the pure gas outlet.

5. The gas purification apparatus according to claim 1, characterized in that, The raw gas inlet and pure gas outlet are equipped with compression fittings, threaded fittings, or quick-connect fittings.

6. The gas purification apparatus according to claim 1, characterized in that, The height-to-diameter ratio of the inner purification tube is between 1 and 20.

7. The gas purification apparatus according to claim 1, characterized in that, The volume ratio of the inner purification tube to the outer purification tube is 1:0.2 to 1:

5.

8. The gas purification apparatus according to claim 1, characterized in that, The lower wire mesh support partition includes multiple support legs and a wire mesh partition. The wire mesh partition is composed of an upper screen plate, multiple layers of wire mesh, and a lower screen plate arranged sequentially from top to bottom. The upper screen plate and the lower screen plate are uniformly provided with screen holes, and the screen hole diameter is larger than the wire mesh diameter.

9. The gas purification apparatus according to claim 1, characterized in that, The internal purification pipe is filled with packing material.

10. The gas purification apparatus according to claim 1, characterized in that, The outer purification pipe between the upper and lower wire mesh partitions is filled with filler.

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