Low-temperature gas-liquid separator

Abstract

The utility model provides a low-temperature gas-liquid separator. The low-temperature gas-liquid separator comprises a shell, a flow guide pipe, a gas outlet pipe and a liquid outlet pipe, wherein a separation cavity is formed in the shell, the air outlet pipe is communicated with the top of the separation cavity, and the liquid outlet pipe is communicated with the bottom of the separation cavity. And meanwhile, a separation section is arranged at the end part of the flow guide pipe and is accommodated in the separation cavity. In addition, separation holes are formed in the separation section, so that when the gas-liquid mixture is conveyed to the separation section along the flow guide pipe, the gas-liquid mixture can be sprayed out along the separation holes and is sprayed to the inner wall of the separation cavity pair, and gas and liquid in the gas-liquid mixture are separated. And meanwhile, the separated gas and liquid respectively ascend and descend in the separation cavity under the action of gravity. Finally, gas flows out of the separation cavity along the gas outlet pipe, liquid flows out of the separation cavity along the liquid outlet pipe, and the purpose of gas-liquid separation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas-liquid separators, in particular to a low-temperature gas-liquid separator. Background Art

[0002] Cryogenic gas-liquid separators are widely used in air separation units and LNG liquefaction units. They mainly use the different gravity characteristics of gas and liquid to separate the gas-liquid mixture.

[0003] However, in actual use, the gas-liquid separator is mostly composed of components such as an ordinary stainless steel cylinder, a wire mesh demister or a baffle, which results in the separator having an excessively high manufacturing cost and a complex internal structure. Utility Model Content

[0004] The utility model aims to provide a low-temperature gas-liquid separator, which can realize gas-liquid separation and simplify the structure of the gas-liquid separator.

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

[0006] A low-temperature gas-liquid separator is used to separate gas and liquid in a gas-liquid mixture, and the low-temperature gas-liquid separator comprises: a shell, a separation chamber is arranged inside the shell; a guide tube is used to transport the gas-liquid mixture; the end of the guide tube is arranged as a separation section; the separation section is accommodated in the separation chamber; the separation section extends along the circumferential side direction of the inner wall of the separation chamber; an air outlet pipe, one end of which is connected to the top of the separation chamber and the other end extends out of the separation chamber for leading out the gas; and a liquid outlet pipe, which is connected to the bottom of the separation chamber for leading out the liquid; wherein, a separation hole is opened on the circumferential side of the separation section so that the gas-liquid mixture in the separation section can be sprayed toward the inner wall of the separation chamber.

[0007] In one embodiment of the present application, the free end of the separation section is closed; or, the free end of the separation section is provided with an end hole with a smaller aperture than the separation hole, and the end hole is used to spray out the gas-liquid mixture in the separation section.

[0008] In one embodiment of the present application, the separation chamber is cylindrical; the separation section is curved and adapted to the cross-sectional shape of the separation chamber.

[0009] In one embodiment of the present application, the separation section extends in the horizontal direction, is located in the middle of the separation chamber in the vertical direction, and is spaced apart from the inner wall of the separation chamber.

[0010] In one embodiment of the present application, the separation holes are provided in a plurality of groups, and the plurality of groups of separation holes are distributed on the separation section along a horizontal direction.

[0011] In one embodiment of the present application, the separation hole includes a horizontal hole and an inclined hole; the horizontal hole is arranged on the side of the separation section facing the inner wall of the separation chamber, and the horizontal hole extends horizontally in the direction toward the inner wall of the separation chamber; the inclined hole is arranged on the side of the separation section facing the inner wall of the separation chamber, and is located below the horizontal hole; the inclined hole is arranged to be inclined downward in the direction toward the inner wall of the separation chamber.

[0012] In one embodiment of the present application, the low-temperature gas-liquid separator further includes a filter assembly; the filter assembly is installed in the separation chamber and is located on the gas flow path from the separation chamber to the gas outlet pipe to filter the gas.

[0013] In one embodiment of the present application, the filter assembly includes a fixing member and a wire mesh; the fixing member is connected to the top of the separation chamber and extends downward; the wire mesh is connected to the fixing member and is spaced apart from the top of the separation chamber.

[0014] In one embodiment of the present application, the flow guide tube is further provided with a connecting section; the connecting section is located in the separation chamber; one end of the connecting section is connected to the fixed end of the separation section and is fixed to the inner wall of the separation chamber.

[0015] In one embodiment of the present application, the shell includes an inner shell and an outer shell; the inner shell forms the separation chamber; the outer shell and the inner shell are spaced apart to form a heat insulation layer.

[0016] In one embodiment of the present application, the thermal insulation layer is configured as a vacuum insulation layer.

[0017] It can be seen from the above technical solution that the utility model has at least the following advantages and positive effects:

[0018] In the utility model, the low-temperature gas-liquid separator includes a shell, a flow guide pipe, an air outlet pipe and a liquid outlet pipe. A separation chamber is arranged inside the shell, the air outlet pipe is connected to the top of the separation chamber, and the liquid outlet pipe is connected to the bottom of the separation chamber. At the same time, a separation section is arranged at the end of the flow guide pipe, and the separation section is accommodated in the separation chamber. In addition, a separation hole is provided on the separation section, so that when the gas-liquid mixture is transported to the separation section along the flow guide pipe, the gas-liquid mixture can be sprayed along the separation hole and sprayed onto the inner wall of the separation chamber, so that the gas and liquid in the gas-liquid mixture are separated. At the same time, the separated gas and liquid rise and fall in the separation chamber respectively under the action of gravity. Finally, the gas flows out of the separation chamber along the air outlet pipe, and the liquid flows out of the separation chamber along the liquid outlet pipe, so as to achieve the purpose of gas-liquid separation.

[0019] In addition, since the low-temperature separator sets a separation hole on the separation section, the gas-liquid mixture is ejected from the separation hole by utilizing the pressure generated by the gas-liquid mixture itself in the guide tube, and the gas-liquid mixture can be sprayed onto the inner wall of the separation chamber through the small hole diffusion principle, thereby simplifying the internal structure of the gas-liquid separator and reducing the manufacturing cost of the separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a low-temperature gas-liquid separator according to an embodiment of the utility model.

[0021] Figure 2 yes Figure 1 A top view of the separation section of a low-temperature gas-liquid separator.

[0022] Figure 3 yes Figure 2 Cross-sectional view of the pipeline of the separation section.

[0023] The following are the descriptions of the reference numerals:

[0024] 10-shell; 11-separation chamber; 12-inner shell; 13-outer shell; 20-flow guide tube; 21-separation section; 22-separation hole; 23-horizontal hole; 24-inclined hole; 25-connecting section; 26-end plate; 31-air outlet pipe; 32-liquid outlet pipe; 40-filter assembly; 41-fixing part; 42-wire mesh. DETAILED DESCRIPTION

[0025] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.

[0026] In the description of the present invention, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In actual use, the gas-liquid separator is mostly composed of ordinary stainless steel cylinder, wire mesh demister or baffle and other components. The structure of the wire mesh demister or baffle and other components is relatively complex and difficult to manufacture, resulting in high manufacturing cost of the separator and complex internal structure. Therefore, a low-temperature gas-liquid separator is proposed to solve the above problems.

[0029] The scheme is further illustrated by the following examples:

[0030] See also Figure 1 The cryogenic gas-liquid separator of this embodiment is used to separate gas and liquid in a gas-liquid mixture. Specifically, the cryogenic gas-liquid separator is used to separate cryogenic gas-liquid mixed media in an air separation unit or an LNG liquefaction unit.

[0031] In this embodiment, the low-temperature gas-liquid separator includes a shell 10, a flow guide pipe 20, a gas outlet pipe 31 and a liquid outlet pipe 32. A separation chamber 11 is provided inside the shell 10 so that the gas and liquid separated from the gas-liquid mixture can coexist in the separation chamber 11. The flow guide pipe 20 is used to transport the gas-liquid mixture so that the gas-liquid mixture can flow into the separation chamber 11 along the flow guide pipe 20. At the same time, the end of the flow guide pipe 20 is provided as a separation section 21. The separation section 21 is accommodated in the separation chamber 11, and the free end is closed. In this embodiment, the separation section 21 extends along the circumferential direction of the inner wall of the separation chamber 11, and a separation hole 22 is provided on the circumferential side of the separation section 21 so that the gas-liquid mixture in the separation section 21 can be sprayed toward the inner wall of the separation chamber 11, so that the gas-liquid mixture can form a gas-liquid separation state on the inner wall of the separation chamber 11. At the same time, under the action of gravity, the gas rises to the top of the separation chamber 11, and the liquid descends to the bottom of the separation chamber 11. In addition, one end of the gas outlet pipe 31 is connected to the top of the separation chamber 11, and the other end extends out of the separation chamber 11 to guide the gas above the separation chamber 11. One end of the liquid outlet pipe 32 is connected to the bottom of the separation chamber 11, and the other end extends out of the separation chamber 11 to guide the liquid gathered at the bottom of the separation chamber 11, so that the separated gas and liquid can be respectively guided to different storage containers to separate and collect the gas-liquid mixture.

[0032] See also Figure 1The shell 10 includes an inner shell 12 and an outer shell 13. In this embodiment, the inner shell 12 and the outer shell 13 are both strain-hardened to improve the structural strength of the shell 10. In addition, the inner shell 12 is formed with a separation chamber 11, and the outer shell 13 is spaced apart from the inner shell 12 to form an insulation layer, thereby ensuring that the low-temperature gas and liquid in the separation chamber 11 are not affected by the external environment. Specifically, the insulation layer is set as a vacuum insulation layer to improve the insulation capacity of the shell 10.

[0033] It should be noted that, in some other embodiments, thermal insulation materials may also be filled in the thermal insulation layer to improve the thermal insulation capacity of the shell 10.

[0034] See also Figure 1 and Figure 2 , the separation chamber 11 is cylindrical, and the separation section 21 is curved and matches the cross-sectional shape of the separation chamber 11. It should be noted that the separation section 21 is set to be curved, which can not only increase the length of the separation section 21, but also have a certain expansion margin when the separation section 21 is affected by environmental changes, so that the separation section 21 can change with the deformation of the shell 10. In this embodiment, Figure 2 As shown, the separation section 21 is similar to a semicircular ring structure, and the radius R of the semicircular ring structure is slightly smaller than the radius of the separation chamber 11. Specifically, the separation section 21 is spaced 10 cm from the inner wall of the separation chamber 11 to ensure the separation effect of the separation section 21 on the gas-liquid mixture.

[0035] It should be noted that, in some other embodiments, the separation chamber 11 may also be configured as a rectangular box structure to meet the needs of different scenarios. At the same time, the separation section 21 may also be configured as a spiral or annular shape to increase the length of the separation section 21 in the separation chamber 11 and improve the efficiency of the separation section 21 in separating the gas-liquid mixture.

[0036] See also Figure 1 In this embodiment, the separation section 21 extends in the horizontal direction and is located in the middle of the separation chamber 11 in the vertical direction, and is spaced apart from the inner wall of the separation chamber 11 to prevent the gas-liquid mixture from flowing directly to the inner wall of the separation chamber 11 after it comes out of the separation section 21, thereby affecting the separation effect. At the same time, the separation section 21 is arranged in the middle of the separation chamber 11 in the vertical direction, so that the gas-liquid mixture has sufficient separation space when it is ejected from the separation section 21, and the separation medium at the ejection point of the separation section 21 is prevented from affecting the gas outlet pipe 31 or the liquid outlet pipe 32, thereby ensuring that the gas outlet pipe 31 and the liquid outlet pipe 32 can respectively duct gas and liquid.

[0037] See also Figure 2 and Figure 3There are multiple groups of separation holes 22, and the multiple groups of separation holes 22 are distributed on the separation section 21 in the horizontal direction, so that the gas-liquid mixture sprayed from the separation section 21 can be evenly sprayed onto the inner wall of the separation chamber 11, ensuring the separation effect of the separation section 21 on the gas-liquid mixture.

[0038] It should be noted that, in this embodiment, the free end of the separation section 21 is welded with an end plate 26 to close the free end of the separation section 21 and enable the gas-liquid mixture to be ejected from the separation section 21 through the separation hole 22. Of course, in some other embodiments, the end plate 26 may also be configured as a bolt plug or a closing valve to close the free end of the separation section 21.

[0039] In addition, in some other embodiments, the free end of the separation section 21 may also be provided with an end hole for spraying out the gas-liquid mixture in the separation section 21 and performing gas-liquid separation on the gas-liquid mixture.

[0040] See also Figure 3 In this embodiment, the separation hole 22 includes a horizontal hole 23 and an inclined hole 24. The horizontal hole 23 is arranged on the side of the separation section 21 facing the inner wall of the separation chamber 11, and the horizontal hole 23 extends horizontally in the direction toward the inner wall of the separation chamber 11. The inclined hole 24 is arranged on the side of the separation section 21 facing the inner wall of the separation chamber 11, and is located below the horizontal hole 23, and the inclined hole 24 is inclined downward in the direction toward the inner wall of the separation chamber 11 to enhance the separation effect of the separation hole 22 on the gas-liquid mixture. Specifically, the inclined hole 24 is arranged at a position 45° below the horizontal hole 23 and facing the inner wall of the separation chamber 11 to improve the separation effect of the horizontal hole 23 and the inclined hole 24, and prevent the horizontal hole 23 and the inclined hole 24 from interfering with each other when spraying the gas-liquid mixture.

[0041] It should be noted that, in the present embodiment, the horizontal hole 23 and the inclined hole 24 are set as through holes, and the apertures of the horizontal hole 23 and the inclined hole 24 are smaller than the cross-sectional aperture of the separation section 21, so as to ensure the separation effect of the horizontal hole 23 and the inclined hole 24 on the gas-liquid mixture. That is, the horizontal hole 23 and the inclined hole 24 separate the gas-liquid mixture through the principle of small hole diffusion, so that the gas-liquid mixture forms a state of gas and liquid separation after being ejected from the separation section 21. In addition, after the gas-liquid mixture diffuses through the horizontal hole 23 and the inclined hole 24, the liquid medium is sprayed onto the inner wall of the separation chamber 11 and separated under the action of gravity, that is, the liquid medium flows to the bottom of the separation chamber 11, and the gaseous medium rises to the top of the separation chamber 11. Specifically, in the present embodiment, the horizontal hole 23 and the inclined hole 24 can separate droplets with a diameter of more than 200 microns.

[0042] See also Figure 1The flow guide pipe 20 is also provided with a connecting section 25. The connecting section 25 is located in the separation chamber 11, one end of the connecting section 25 is connected to the fixed end of the separation chamber 21, and is fixed on the inner wall of the separation chamber 11, so as to guide the gas-liquid mixture to the separation chamber 21.

[0043] See also Figure 1 The low-temperature gas-liquid separator further includes a filter assembly 40. The filter assembly 40 is installed in the separation chamber 11 and is located on the gas flow path from the separation chamber 11 to the gas outlet pipe 31, that is, it covers the connection between the gas outlet pipe 31 and the separation chamber 11 to filter the gas. Specifically, in this embodiment, the filter assembly 40 is used to further separate the liquid in the gaseous medium separated by the separation section 21 to improve the purity of the gas flowing out of the gas outlet pipe 31.

[0044] Specifically, the filter assembly 40 includes a fixing member 41 and a wire mesh 42. The fixing member 41 is connected to the top of the separation chamber 11 and extends downward. The wire mesh 42 is connected to the fixing member 41 and is spaced apart from the top of the separation chamber 11 to prevent the wire mesh 42 from being affected by the liquid accumulated on the inner wall of the separation chamber 11. In this embodiment, the distance between the wire mesh 42 and the connection between the air outlet pipe 31 and the separation chamber 11 is greater than or equal to 300 mm, that is, the distance between the wire mesh 42 and the top of the inner wall of the separation chamber 11 is greater than or equal to 300 mm, so as to ensure the separation effect of the wire mesh 42 on the gaseous medium.

[0045] It should be noted that, in the present embodiment, the screen 42 can separate droplets of 3-5 microns to accurately separate the gas in the separation chamber 11 and ensure the overall separation effect of the gas-liquid separator.

[0046] In summary, the gas-liquid separator filters the gas-liquid mixture step by step by setting the separation section 21 and the filter assembly 40 in the separation chamber 11 to separate the gas and liquid in the gas-liquid mixture, and sets the gas outlet pipe 31 and the liquid outlet pipe 32 to respectively guide the separated gas and liquid, thereby achieving separation of the gas-liquid mixture. It should be noted that since the structures of the separation section 21 and the filter assembly 40 in the gas-liquid separator are relatively simple, the manufacturing cost of the gas-liquid separator can be reduced.

[0047] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A low-temperature gas-liquid separator for separating gas and liquid in a gas-liquid mixture, characterized in that: The low-temperature gas-liquid separator comprises: A shell body, wherein a separation chamber is provided inside the shell body; A flow guide pipe, which is used to transport a gas-liquid mixture; the end of the flow guide pipe is set as a separation section; the separation section is accommodated in the separation chamber; the separation section extends along the circumferential side direction of the inner wall of the separation chamber; an air outlet pipe, one end of which is connected to the top of the separation chamber and the other end of which extends out of the separation chamber for outlet of gas; and A liquid outlet pipe connected to the bottom of the separation chamber for leading out liquid; Wherein, separation holes are opened on the peripheral side of the separation section so that the gas-liquid mixture in the separation section can be sprayed toward the inner wall of the separation chamber.

2. The low-temperature gas-liquid separator according to claim 1, characterized in that: The free end of the separation section is closed; or, the free end of the separation section is provided with an end hole with a smaller aperture than the separation hole, and the end hole is used to spray out the gas-liquid mixture in the separation section.

3. The low-temperature gas-liquid separator according to claim 1, characterized in that: The separation chamber is cylindrical; the separation section is curved and matched with the cross-sectional shape of the separation chamber.

4. The low-temperature gas-liquid separator according to claim 1, characterized in that: The separation section extends in the horizontal direction, is located in the middle of the separation chamber in the vertical direction, and is spaced apart from the inner wall of the separation chamber.

5. The low-temperature gas-liquid separator according to claim 3 or 4, characterized in that: The separation holes are arranged in a plurality of groups, and the plurality of groups of separation holes are distributed on the separation section along the length direction of the separation section.

6. The low-temperature gas-liquid separator according to claim 3 or 4, characterized in that: The separation hole includes a horizontal hole and an inclined hole; the horizontal hole is arranged on the side of the separation section facing the inner wall of the separation chamber, and the horizontal hole extends horizontally in the direction toward the inner wall of the separation chamber; the inclined hole is arranged on the side of the separation section facing the inner wall of the separation chamber and is located below the horizontal hole; the inclined hole is arranged to be inclined downward in the direction toward the inner wall of the separation chamber.

7. The low-temperature gas-liquid separator according to claim 1, characterized in that: It also includes a filter assembly; the filter assembly is installed in the separation chamber and is located on the gas flow path from the separation chamber to the gas outlet pipe to filter the gas.

8. The low-temperature gas-liquid separator according to claim 7, characterized in that: The filter assembly includes a fixing member and a wire mesh; the fixing member is connected to the top of the separation chamber and extends downward; the wire mesh is connected to the fixing member and is spaced apart from the top of the separation chamber.

9. The low-temperature gas-liquid separator according to claim 1, characterized in that: The flow guide pipe is also provided with a connecting section; the connecting section is located in the separation chamber; one end of the connecting section is connected to the fixed end of the separation section and is fixed on the inner wall of the separation chamber.

10. The low-temperature gas-liquid separator according to claim 1, characterized in that: The shell comprises an inner shell and an outer shell; the inner shell forms the separation cavity; the outer shell and the inner shell are spaced apart to form a heat insulation layer.

11. The low-temperature gas-liquid separator according to claim 10, characterized in that: The heat insulating layer is configured as a vacuum heat insulating layer.

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