Low-temperature methanol washing lean methanol precision filtering device and low-temperature methanol washing system

Abstract

This utility model discloses a low-temperature methanol washing lean methanol precision filtration device and a low-temperature methanol washing system. The filtration device includes an installation and connection structure, a filter element installation assembly, and an external pipeline structure. At least one end of the installation and connection structure along its axial direction is provided with the filter element installation assembly, and the external pipeline structure is provided on the outer side of the filter element installation assembly. The filter element installation assembly and the installation and connection structure are plugged into each other along the axial direction, and the external pipeline structure and the installation and connection structure are plugged into each other along the axial direction, with the external pipeline structure and the installation and connection structure being relatively fixed. The filter element installation assembly adopts a plug-in connection. Compared with the complex disassembly and assembly steps of traditional filtration devices, this device does not require the additional disassembly of a large number of connecting parts. The filter element installation assembly can be plugged in and unplugged to complete the replacement of the low-temperature methanol washing lean methanol filtration equipment, greatly simplifying the operation process, saving manpower and time costs, and effectively solving the problem of cumbersome filter element replacement in existing equipment.

Description

Technical Field

[0001] This utility model relates to the field of low-temperature methanol washing of lean methanol, and in particular to a low-temperature methanol washing lean methanol precision filtration device and a low-temperature methanol washing system. Background Technology

[0002] In the chemical production field, low-temperature methanol washing is an extremely important and widely used gas purification technology. This process mainly utilizes the excellent absorption capacity of methanol for acidic gases (such as carbon dioxide and hydrogen sulfide) at low temperatures, thereby removing impurities from the feed gas and achieving gas purification. Lean methanol, as the key absorbent in the low-temperature methanol washing process, needs to be continuously recycled within the system.

[0003] During the lean methanol cycle, various impurities inevitably get mixed in, such as rust in the system, debris from pipes, and small particles of incompletely filtered reaction byproducts. Although there are various devices for methanol filtration on the market, there are still many problems with precision filtration of lean methanol washed with low-temperature methanol.

[0004] Traditional filtration equipment is not well-designed in terms of structure. For example, the installation and replacement of filter elements are cumbersome, requiring a lot of manpower and time. Furthermore, it is difficult to ensure good sealing during installation, which can easily lead to leakage. This not only affects the filtration effect but also poses certain safety hazards. Utility Model Content

[0005] In view of this, the present invention provides a low-temperature methanol washing lean methanol precision filtration device, which is easy to disassemble and improves the filter element replacement efficiency. Furthermore, the present invention also provides a low-temperature methanol washing system incorporating the above-mentioned low-temperature methanol washing lean methanol precision filtration device.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A low-temperature methanol washing lean methanol precision filtration device includes an installation and connection structure, a filter element installation assembly, and an external pipeline structure. At least one end of the installation and connection structure along its own axis is provided with a filter element installation assembly, and an external pipeline structure is provided on the outside of the filter element installation assembly. The filter element installation assembly is inserted into the installation and connection structure along the axis, and the external pipeline structure is inserted into the filter element installation assembly along the axis, and the external pipeline structure and the installation and connection structure are relatively fixedly arranged.

[0008] As a preferred embodiment of this utility model, in the above-mentioned low-temperature methanol washing lean methanol precision filtration device, the installation and connection structure includes a filter pipe, and the end of the filter pipe is provided with a first connection groove.

[0009] The filter element mounting assembly includes a filter element body and a mounting sleeve. The mounting sleeve is fitted onto the outside of the filter element body and inserted into the first connecting groove. The filter element body is inserted into the filter pipe.

[0010] As a preferred embodiment of this utility model, in the above-mentioned low-temperature methanol washing lean methanol precision filtration device, the side of the mounting sleeve away from the filter pipe along the axial direction has a snap-fit ​​groove; the external pipe structure includes a liquid outlet pipe, one end of which has a snap-fit ​​sealing ring, and the snap-fit ​​sealing ring is connected to the snap-fit ​​groove in a sealed plug-in connection.

[0011] As a preferred embodiment of this utility model, in the above-mentioned low-temperature methanol washing lean methanol precision filtration device, the snap-fit ​​sealing ring and the bottom of the snap-fit ​​groove are mutually abutted and limited along the axial direction of the mounting sleeve.

[0012] As a preferred embodiment of this utility model, in the above-mentioned low-temperature methanol washing lean methanol precision filtration device, the filter pipe and the external pipe structure are connected by a flange.

[0013] As a preferred embodiment of this utility model, in the above-mentioned low-temperature methanol washing lean methanol precision filtration device, a first flange is provided on the outer surface of the filter pipe, and a second flange is provided on the outside of the snap-fit ​​sealing ring, and the first flange and the second flange are fixedly connected.

[0014] As a preferred embodiment of this utility model, in the above-mentioned low-temperature methanol washing lean methanol precision filtration device, filter element mounting assemblies are provided at both ends of the mounting and connecting structure along the axial direction, and external pipeline structures are connected to both ends of the mounting and connecting structure along the axial direction.

[0015] As a preferred embodiment of this utility model, the above-mentioned low-temperature methanol washing lean methanol precision filtration device further includes a support structure for supporting the installation and connection structure.

[0016] As a preferred embodiment of this utility model, in the above-mentioned low-temperature methanol washing lean methanol precision filtration device, the support structure includes: a support rod, the top of which is provided with a fixing sleeve, the fixing sleeve being sleeved on the outside of the installation and connection structure and being connected in a coordinated manner;

[0017] The support pad is located at the bottom of the support rod and is a flexible component.

[0018] Furthermore, a second aspect of this application discloses a low-temperature methanol washing system, comprising a regeneration tower, a filtration device, and an absorption tower connected in sequence, wherein the filtration device is any of the aforementioned low-temperature methanol washing lean methanol precision filtration devices.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This utility model discloses a filter element installation assembly for a low-temperature methanol washing lean methanol precision filtration device that uses a plug-in connection. Compared with the complex disassembly and assembly steps of traditional filtration devices, this device does not require the additional disassembly of a large number of connecting parts. The filter element installation assembly can be plugged in and unplugged to complete the replacement of the low-temperature methanol washing lean methanol filtration device, which greatly simplifies the operation process, saves manpower and time costs, and effectively solves the problem of cumbersome filter element replacement in existing equipment.

[0021] In addition, this embodiment also discloses a low-temperature methanol washing system, including a regeneration tower, a filtration device and an absorption tower connected in sequence. The filtration device is the filtration device disclosed in the above embodiment. Therefore, the low-temperature methanol washing system with this filtration device also has all the above-mentioned technical effects, which will not be repeated here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the main structure of the low-temperature methanol washing lean methanol precision filtration device provided by this utility model;

[0024] Figure 2 A first-view diagram of the low-temperature methanol washing lean methanol precision filtration device provided by this utility model.

[0025] Figure 3 A second-view diagram of the low-temperature methanol washing lean methanol precision filtration device provided by this utility model;

[0026] Figure 4 A cross-sectional schematic diagram of the low-temperature methanol washing lean methanol precision filtration device provided by this utility model;

[0027] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0028] Among them, 10-support structure, 101-support rod, 102-fixed sleeve, 103-support pad;

[0029] 20-Installation connection structure, 201-Filter pipe, 202-First connecting groove, 203-First flange, 204-Locking bolt;

[0030] 30-Filter element mounting assembly, 301-Mounting sleeve, 302-Connecting limit ring, 303-Snap-fit ​​groove, 304-Filter element body;

[0031] 40 - External piping structure, 401 - Second flange, 402 - Snap-fit ​​sealing ring, 403 - Liquid outlet pipe. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0034] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0035] like Figure 1 As shown, this utility model provides a low-temperature methanol washing lean methanol precision filtration device, including a support structure 10, an installation and connection structure 20, a filter element installation assembly 30, and an external pipeline structure 40.

[0036] The support structure 10 has a mounting connection structure 20 at its top. A filter element mounting assembly 30 is provided at at least one end of the mounting connection structure 20 along its axial direction. Optionally, filter element mounting assemblies 30 are provided on both sides of the mounting connection structure 20 along its axial direction. The filter element mounting assembly 30 is capable of filtering low-temperature methanol wash lean methanol.

[0037] An external pipe structure 40 is provided on the outside of the filter element mounting assembly 30.

[0038] In this embodiment, the filter element mounting assembly 30 and the mounting connection structure 20 are connected by insertion along the axial direction of the mounting connection structure 20. Optionally, the filter element mounting assembly 30 is inserted into the interior of the mounting connection structure 20.

[0039] The external pipe structure 40 and the filter element mounting assembly 30 are connected by insertion along the axial direction of the mounting connection structure 20. Optionally, the external pipe structure 40 is inserted into the inside of the filter element mounting assembly 30, so that one end of the filter element mounting assembly 30 is connected to the mounting connection structure 20 and the other end is connected to the external pipe structure 40.

[0040] It should be noted that the filter element installation assembly 30 of the low-temperature methanol washing lean methanol precision filtration device in this embodiment adopts a plug-in connection. Compared with the complicated disassembly and assembly steps of traditional filtration devices, this device does not require the additional disassembly of a large number of connecting parts. The filter element installation assembly 30 can be plugged in and unplugged to complete the replacement of the low-temperature methanol washing lean methanol filtration device, which greatly simplifies the operation process, saves manpower and time costs, and effectively solves the problem of cumbersome filter element replacement in existing equipment.

[0041] In some embodiments, the external pipe structure 40 and the mounting connection structure 20 are fixedly arranged relative to each other. Optionally, the external pipe structure 40 and the mounting connection structure 20 can be connected by a connector.

[0042] The external pipeline structure 40 is fixedly connected to the installation connection structure 20, which can resist the flow pressure of lean methanol at low temperature (usually -30℃ to -70℃), ensuring that the components of the low temperature methanol washing lean methanol precision filter device are stably connected under low temperature and high pressure environment, and ensuring that the filtration link is continuously embedded in the lean methanol circulation process.

[0043] In the low-temperature methanol washing process, the lean methanol regenerated by the regeneration tower needs to be recycled to the absorption tower to participate in the absorption of acidic gases again. During this process, the lean methanol will first enter the installation connection structure 20, and during the flow through the filter element installation assembly 30 inserted inside the installation connection structure 20, the filter element installation assembly 30 can filter out impurities such as rust and catalyst particles mixed in the lean methanol. The filtered lean methanol is then transported to the inlet of the absorption tower through the external pipeline structure 40 to complete the circulation.

[0044] Figure 1 In the middle, the support structure 10 includes a support rod 101, a fixing sleeve 102 and a support pad 103.

[0045] The support rod 101 has a fixed sleeve 102 at the top along the height direction and a support pad 103 at the bottom along the height direction.

[0046] The fixing sleeve 102 is a hollow cylindrical structure. Optionally, the fixing sleeve 102 is a cylindrical structure, and the mounting connection structure 20 can be inserted into the fixing sleeve 102.

[0047] In the example, the fixed sleeve 102 is fixedly connected to the support rod 101 at its midpoint along the axial direction. Optionally, the fixed sleeve 102 and the support rod 1001 are integrally formed or welded together. The support rod 101 is perpendicular to the axial direction of the fixed sleeve 102.

[0048] In the equipment layout of the low-temperature methanol washing process, the support rod 101 raises the installation connection structure 20 to a height that matches the circulation pipeline by vertically supporting the fixed sleeve 102, so that the filter element installation assembly 30 in the installation connection structure 20 is precisely connected to the lean methanol circulation pipeline, ensuring that the lean methanol can flow into the installation connection structure 20 naturally by relying on the system pressure.

[0049] In some embodiments, the support pad 103 is made of rubber, which can maintain elasticity in low-temperature environments. This increases the friction with the ground to prevent the device from shifting due to pipeline vibration, and also buffers the high-frequency vibration generated by the pump body during the process. This can alleviate the loosening of the interface between the installation connection structure 20 and the main circulation pipeline caused by the impact force generated by the fluctuation of lean methanol flow, and ensure the stability of lean methanol transportation.

[0050] like Figures 2 to 5 As shown, the installation connection structure 20 includes a filter pipe 201, a first connecting groove 202 and a first flange 203; the filter element installation assembly 30 includes an installation sleeve 301, a connecting limiting ring 302, a snap-fit ​​groove 303 and a filter element body 304; the external pipe structure 40 includes a second flange 401, a snap-fit ​​sealing ring 402 and a liquid outlet pipe 403.

[0051] The filter pipe 201 has a first connecting groove 202 at at least one end along the axial direction, and a first flange 203 is provided on the outer side of at least one end along the axial direction. In the example, the filter pipe 201 has a first connecting groove 202 and a first flange 203 at both ends along the axial direction.

[0052] The mounting sleeve 301 and the filter pipe 201 are arranged along the axial direction of the filter pipe 201, and the filter element body 304 is provided inside the mounting sleeve 301. A connecting limit ring 302 is provided at one end of the mounting sleeve 301 along the axial direction near the external pipe structure 40.

[0053] The outlet pipe 403 and the mounting sleeve 301 are arranged along the axial direction of the filter pipe 201, and a snap-fit ​​sealing ring 402 is provided at one end of the outlet pipe 403 near the mounting sleeve 301, and a second flange 401 is provided on the outer side of the end of the outlet pipe 403 near the mounting sleeve 301.

[0054] In this embodiment, the filter pipe 201 serves as the core channel and can be optionally a circular pipe structure. The filter pipe 201 receives lean methanol from the regeneration tower. The internal space of the filter pipe 201 ensures that the lean methanol has sufficient residence time to fully contact the filter element; therefore, the size of the filter pipe 201 is not specifically limited. The filter pipe 201 is inserted into the fixing sleeve 102. This can be understood as the fixing sleeve 102 being fitted onto the outside of the filter pipe 201, thereby fixing the fixing sleeve 102 to the filter pipe 201, and thus fixing the support structure 10 and the mounting connection structure 20.

[0055] The filter pipe 201 has a first connecting groove 202 on both sides of the side wall along the axial direction. The installation sleeve 301 is inserted into the first connecting groove 202 to achieve precise positioning of the filter element installation assembly 30 using the first connecting groove 202, ensuring that the lean methanol flows completely through the filter element body 304 without bypass.

[0056] In some embodiments, the first connecting groove 202 is an annular groove at the end of the filter pipe 201, and the mounting sleeve 301 is inserted into the annular groove to achieve a fixed connection between the filter pipe 201 and the mounting sleeve 301.

[0057] In this embodiment, the filter pipe 201 and the mounting sleeve 301 are connected by a plug-in connection, which can ensure the sealing of the filter pipe 201 and the mounting sleeve 301 after connection, and help prevent lean methanol leakage.

[0058] The filter element body 304 serves as the filter structure of the filter element mounting assembly 30 and is located inside the mounting sleeve 301. This can be understood as the mounting sleeve 301 being fitted onto the outside of the filter element body 304, and the filter element body 304 and the mounting sleeve 301 being fixed together. Optionally, the filter element body 304 and the mounting sleeve 301 are connected in a cooperative manner.

[0059] The filter element body 304 extends into the interior of the filter pipe 201.

[0060] In this embodiment, the filter element body 304 is stably placed inside the filter pipe 201 by the fixed connection between the filter pipe 201 and the mounting sleeve 301.

[0061] In some embodiments, the filter element body 304 uses a high-precision filter material to filter lean methanol. Optionally, the filter element body 304 uses a sintered metal mesh or a composite filter membrane material to filter out tiny impurities smaller than 5μm in lean methanol (such as FeS particles generated by system corrosion), thereby meeting the requirements of the low-temperature methanol washing process for the cleanliness of lean methanol.

[0062] The filtration accuracy of the filter element body 304 in this embodiment can be set according to different needs, and all of them are within the protection range.

[0063] In some embodiments, the connecting limiting ring 302 and the mounting sleeve 301 are arranged radially along the mounting sleeve 301, and the connecting limiting ring 302 is located in the inner ring of the mounting sleeve 301. There is a gap between the connecting limiting ring 302 and the mounting sleeve 301 in the radial direction, and the gap is formed as a snap-fit ​​groove 303. It can be understood that the end of the mounting sleeve 301 near the external pipe structure 40 in the axial direction has an annular snap-fit ​​groove 303.

[0064] The snap-fit ​​sealing ring 402 of the outlet pipe 403 is inserted into the snap-fit ​​groove 303 to achieve a sealed and fixed connection between the outlet pipe 403 and the mounting sleeve 301, preventing unfiltered lean methanol from bypassing the filter element body 304 and directly entering the downstream process.

[0065] The end of the connecting limiting ring 302 away from the outlet pipe 403 is fixedly connected to the mounting sleeve 301, thus forming the bottom of the snap-fit ​​groove 303. The snap-fit ​​sealing ring 402 is inserted into the snap-fit ​​groove 303, and the snap-fit ​​sealing ring 402 abuts against the bottom of the snap-fit ​​groove 303, thereby using the snap-fit ​​sealing ring 402 to axially limit the filter element mounting assembly 30, preventing the filter element mounting assembly 30 from shifting to the outside of the pipeline under the impact of lean methanol.

[0066] As lean methanol enters the filter pipe 201 at a certain flow rate, the connecting limiting ring 302 restricts the displacement of the installation sleeve 301 under fluid impact, ensuring that the filter element body 304 is always in the center of the flow channel.

[0067] In some embodiments, the snap-fit ​​sealing ring 402 is made of low-temperature resistant rubber and is tightly snapped into the snap-fit ​​groove 303 of the mounting sleeve 301 to achieve a seal between the liquid outlet pipe 403 and the mounting sleeve 301.

[0068] In this embodiment, the first flange 203 and the second flange 401 of the external pipeline structure 40 are tightly connected by locking bolts 204. The connection between the first flange 203 and the second flange 401 ensures that the external pipeline structure 40 and the installation connection structure 20 can still provide sufficient pre-tightening force at low temperatures, preventing loosening of the connection due to material thermal shrinkage. This ensures that the filtered lean methanol smoothly enters the buffer tank before the absorption tower through the external pipeline structure 40 and is integrated into the entire circulation process.

[0069] Furthermore, in this embodiment, the insertion of the snap-fit ​​sealing ring 402 and the snap-fit ​​groove 303 forms an axial limit on the filter element mounting assembly 30, preventing the filter element mounting assembly 30 from shifting to the outside of the pipeline under the impact of lean methanol; then, through the fit between the second flange 401 and the first flange 203 and the tightening of the locking bolt 204, the limiting force is converted into rigid fixation, ensuring that the position of the filter element mounting assembly 30 remains unchanged during long-term operation.

[0070] In addition, the dual fixing structure not only ensures the effective contact area between the filter element body 304 and the lean methanol, but also prevents gaps from appearing on the sealing surface at low temperatures by uniformly applying force to the locking bolts 204, thus preventing unfiltered lean methanol from short-circuiting into the downstream process and ensuring that the filtered lean methanol fully meets the absorption efficiency requirements of the absorption tower for acidic gases.

[0071] In the lean methanol circulation process, the second flange 401 and the first flange 203 are fastened together by locking bolts 204 to ensure a rigid connection between the liquid outlet pipe 403 and the filter pipe 201, which can adapt to the thermal expansion and contraction stress at low temperatures. Combined with the sealing connection between the snap-fit ​​sealing ring 402 and the snap-fit ​​groove 303, a double seal (snap-fit ​​seal + flange face seal) can be formed to prevent leakage of lean methanol at low temperatures due to seal failure (methanol is still highly volatile at low temperatures, and leakage can easily cause safety risks).

[0072] The outlet pipe 403 transports the filtered lean methanol to the inlet of the circulating pump, where it continues to participate in the acid gas absorption process of the absorption tower, ensuring the recycling rate of lean methanol.

[0073] In some embodiments, the support pad 103 is made of rubber.

[0074] During the continuous operation of the low-temperature methanol washing process, fluctuations in the lean methanol flow rate within the filter pipe 201 generate impact forces. The rigid connection between the fixed sleeve 102 and the filter pipe 201 transmits these impact forces to the support rod 101, dispersing them to the support pad 103. The support pad 103 does not become brittle at low temperatures and buffers the impact forces through its own deformation, preventing fatigue cracking of the weld seams in the filter pipe 201 due to long-term stress. Simultaneously, the anti-slip properties of the rubber material ensure that the device does not slip on the workshop floor (where condensation may exist), guaranteeing the connection accuracy between the filter device and upstream and downstream pipelines and maintaining a stable flow rate of lean methanol in the process.

[0075] Based on the connection relationship of the low-temperature methanol washing lean methanol precision filtration device disclosed in this embodiment, it can be seen that in the filter element replacement stage of the lean methanol filtration process (usually every 3-6 months), the plug-in design of the mounting sleeve 301 and the first connecting groove 202 allows the operator to quickly pull out the component without disassembling the entire pipeline, reducing process downtime.

[0076] Furthermore, the fixing structure (such as a sealing ring) between the filter element body 304 and the mounting sleeve 301 ensures that it does not shake under high-speed flow of lean methanol (typically 1-3 m / s), thus avoiding any impact on filtration accuracy. The filter element body 304 is located inside the filtration pipe 201, ensuring that all flowing lean methanol must pass through the filter medium, guaranteeing that the impurity content in the lean methanol entering the absorption tower is ≤1 ppm, meeting the stringent requirements for absorbent cleanliness in the low-temperature methanol washing process.

[0077] The working process of the low-temperature methanol washing lean methanol precision filtration device disclosed in this embodiment is as follows:

[0078] First, the support structure 10, through the cooperation of the support rod 101, the fixed sleeve 102 and the support pad 103, stably supports the filter pipe 201 at a height that matches the circulation system. The support pad 103 buffers the vibration of the pump body and pipes during the process, ensuring the overall position of the device is stable and preventing the interface from loosening. The lean methanol after regeneration in the regeneration tower (which needs to participate in the absorption of acidic gases again) is transported to the filter pipe 201 of the installation and connection structure 20 through the upstream pipeline.

[0079] Secondly, the lean methanol entering the filter pipe 201 is driven by the system pressure to flow to the filter element mounting assemblies 30 on both sides. The mounting sleeve 301 of the filter element mounting assembly 30 is positioned by being inserted into the first connecting groove 202 of the filter pipe 201. The filter element body 304 inside the mounting sleeve 301 extends into the flow channel of the filter pipe 201, ensuring that all lean methanol must flow through the filter element body 304. The filter element body 304 is used to filter out tiny impurities (such as rust, FeS particles, catalyst debris, etc.) smaller than 5μm in the lean methanol, achieving precision filtration. The connecting limiting ring 302 of the mounting sleeve 301 can limit the displacement of the mounting sleeve 301 under fluid impact, ensuring that the filter element body 304 is always in the center of the flow channel and in full contact with the lean methanol.

[0080] The filtered clean lean methanol enters the external pipeline structure 40, and is transported to the downstream circulating pump or the buffer tank before the absorption tower via the outlet pipe 403 of the external pipeline structure 40. It then re-enters the absorption tower to participate in the acid gas absorption process, thus completing the recycling of lean methanol.

[0081] The plug-in, snap-fit, and bolt-fixing structure of each component in this embodiment not only ensures filtration accuracy and sealing, but also facilitates the periodic (usually every 3-6 months) disassembly of the external pipeline structure 40 and the extraction of the filter element installation assembly 30 for replacement of the filter element body 304, reducing process downtime and ensuring the continuous and stable operation of the low-temperature methanol washing system.

[0082] Furthermore, this application also discloses a low-temperature methanol washing system, comprising a regeneration tower, a filtration device, and an absorption tower connected in sequence. The filtration device is the low-temperature methanol washing lean methanol precision filtration device disclosed in the above embodiments. Therefore, the low-temperature methanol washing system with this low-temperature methanol washing lean methanol precision filtration device also has all the above-mentioned technical effects, which will not be elaborated here.

[0083] The filter pipe 201 of the low-temperature methanol washing lean methanol precision filter is connected to the regeneration tower, and the external pipe structure 40 of the low-temperature methanol washing lean methanol precision filter is connected to the absorption tower.

[0084] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0085] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-temperature methanol washing lean methanol precision filtration device, characterized in that, It includes an installation connection structure (20), a filter element installation assembly (30), and an external pipeline structure (40). The installation connection structure (20) has the filter element installation assembly (30) at at least one end along its own axis, and the external pipe structure (40) is provided on the outside of the filter element installation assembly (30). The filter element mounting assembly (30) is inserted into the mounting connection structure (20) along the axial direction, and the external pipe structure (40) is inserted into the filter element mounting assembly (30) along the axial direction, and the external pipe structure (40) and the mounting connection structure (20) are fixedly arranged relative to each other.

2. The low-temperature methanol washing lean methanol precision filtration device according to claim 1, characterized in that, The installation connection structure (20) includes a filter pipe (201), and a first connection groove (202) is provided at the end of the filter pipe (201). The filter element mounting assembly (30) includes a filter element body (304) and a mounting sleeve (301). The mounting sleeve (301) is sleeved on the outside of the filter element body (304) and inserted into the first connecting groove (202). The filter element body (304) is inserted into the filter pipe (201).

3. The low-temperature methanol washing lean methanol precision filtration device according to claim 2, characterized in that, The mounting sleeve (301) has a snap-fit ​​groove (303) on the side away from the filter pipe (201) along the axial direction. The external pipeline structure (40) includes a liquid outlet pipe (403), one end of which has a snap-fit ​​sealing ring (402), which is sealed and plugged into the snap-fit ​​groove (303).

4. The low-temperature methanol washing lean methanol precision filtration device according to claim 3, characterized in that, The snap-fit ​​sealing ring (402) and the bottom of the snap-fit ​​groove (303) are abutted and limited along the axial direction of the mounting sleeve (301).

5. The low-temperature methanol washing lean methanol precision filtration device according to claim 4, characterized in that, The filter pipe (201) is connected to the external pipe structure (40) via a flange.

6. The low-temperature methanol washing lean methanol precision filtration device according to claim 5, characterized in that, The outer surface of the filter pipe (201) is provided with a first flange (203), and the outer side of the snap-fit ​​sealing ring (402) is provided with a second flange (401). The first flange (203) and the second flange (401) are fixedly connected.

7. The low-temperature methanol washing lean methanol precision filtration device according to any one of claims 1 to 6, characterized in that, The installation connection structure (20) is provided with filter element installation components (30) at both ends along the axial direction, and the installation connection structure (20) is connected to the external pipe structure (40) at both ends along the axial direction.

8. The low-temperature methanol washing lean methanol precision filtration device according to any one of claims 1 to 6, characterized in that, It also includes a support structure (10) for supporting the mounting connection structure (20).

9. The low-temperature methanol washing lean methanol precision filtration device according to claim 8, characterized in that, The support structure (10) includes: A support rod (101) is provided with a fixing sleeve (102) at its top. The fixing sleeve (102) is sleeved on the outside of the mounting connection structure (20) and is connected in a fitting manner. Support pad (103) is disposed at the bottom of the support rod (101) and the support pad (103) is a flexible component.

10. A low-temperature methanol washing system, characterized in that, It includes a regeneration tower, a filtration device, and an absorption tower connected in sequence, wherein the filtration device is a low-temperature methanol washing lean methanol precision filtration device as described in any one of claims 1 to 9.

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