System and method for separating impurities in raw material natural gas

Abstract

The invention relates to the technical field of natural gas treatment, in particular to a system and method for separating impurities in raw natural gas. The system comprises a separation device, a flash evaporation device, a filtering device, a purification device and a removal agent catcher, the separation device comprises a separation cavity, an exhaust core pipe and a liquid discharge pipe; the separation cavity is provided with a cylinder section and a conical cylinder section, a first inlet and a second inlet are formed in the side wall of the cylinder section, an atomizing nozzle is arranged in the second inlet, the outlet direction of the second inlet is opposite to the rotational flow direction of the raw material natural gas, and the first inlet is flush with the second inlet; the exhaust core pipe is communicated with the interior of the separation cavity; the liquid discharge pipe is communicated with the interior of the separation cavity; the second inlet, the flash evaporation device, the filtering device, the purifying device and the removing agent catcher are connected in sequence. According to the method, the impurity removal rate of the raw material natural gas can be remarkably increased, the probability that the amine liquid is polluted can be greatly reduced, recycling of the eluent can be achieved, and the treatment cost is reduced.

Description

Technical Field

[0001] This application relates to the field of natural gas processing technology, specifically to a system and method for separating impurities from raw natural gas. Background Technology

[0002] With the rapid development of my country's natural gas industry and the promulgation and implementation of the national standards GB17820-2018 "Natural Gas" and GB 31570-2015 "Emission Standards for Pollutants from Petroleum Refining Industry," higher requirements have been placed on the efficient and stable production of natural gas. Natural gas purification is a crucial link in the production and supply of natural gas. The dominant desulfurization process is the amine method. However, the amine desulfurization and decarbonization solution (referred to as amine solution) is easily contaminated and deteriorated by residues carried by the raw natural gas during the natural gas purification process, leading to contamination of the desulfurization amine solution and affecting the normal operation of the natural gas purification unit.

[0003] In the natural gas purification process, the presence of foreign liquid and solid contaminants in the feed gas is a major cause of unstable operation of natural gas purification units. Natural gas often contains well-produced fluids. These fluids are intercepted at each stage of the separation process from the well station to the gas gathering station to the natural gas purification plant. However, the composition of these fluids is complex, and the entrained particles are small. Some extremely small particles are lifted by the high-speed airflow or evaporate into droplets or aerosols, exceeding the precision of each separator and filter. These particles then enter the desulfurization solution in the natural gas purification plant, contaminating the amine solution, increasing its foaming tendency, strengthening its corrosiveness, and reducing its desulfurization performance. Such contamination leading to unit malfunctions is common. Effectively separating impurities from the feed gas and maintaining the cleanliness of the amine solution is crucial for stable and high-yield production in the natural gas purification process. Summary of the Invention

[0004] This application provides a system and method for separating impurities in raw natural gas. By introducing the raw natural gas into a cyclone separator while simultaneously introducing the eluent into the cyclone separator in an atomized manner, the raw natural gas can effectively remove impurities entrained in it through the eluent during cyclone separation, thereby maintaining the cleanliness of the amine solution and solving the problem of equipment malfunction caused by contamination from external pollutants, which is common in existing natural gas purification devices.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, this application provides a system for separating impurities in raw natural gas, including a separation device, a flash evaporation device, a filtration device, a purification device, and a desiccant collector;

[0007] The separation device includes:

[0008] A separation chamber has a cylindrical section and a conical section. A first inlet and a second inlet are provided on the side wall of the cylindrical section. The first inlet is used to connect to the raw material natural gas supply port, and the second inlet is used to connect to the eluent supply port. An atomizing nozzle is provided in the second inlet. The outlet direction of the second inlet is arranged opposite to the swirling direction of the raw material natural gas. The first inlet and the second inlet are flush in the axial direction of the cylindrical section.

[0009] An exhaust core pipe is connected to one axial end of the cylindrical section and communicates with the interior of the separation chamber.

[0010] A drain pipe is connected to one axial end of the conical section and communicates with the interior of the separation chamber.

[0011] The flash evaporator is connected to the drain pipe, the filter is connected to the flash evaporator, the purification device is connected to the filter, and the remover collector is connected to the purification device and to the second inlet.

[0012] In some alternative embodiments, the first inlet is configured as a volute structure.

[0013] In some alternative embodiments, the first inlet is configured as a 90° or 180° annular volute structure.

[0014] In some optional embodiments, the height-to-diameter ratio of the inner cavity of the separation chamber is configured to be 2 to 4, wherein the inner diameter of the cylindrical section is configured to be 75 to 150 cm.

[0015] In some alternative embodiments, the exhaust core tube is configured as a spiral slotted diverter.

[0016] In some alternative embodiments, the port on the exhaust core tube located inside the separation chamber is flush with the first inlet.

[0017] In some alternative embodiments, the exhaust core tube is configured as a round tube, a tapered tube, or a combination of the two.

[0018] In some alternative embodiments, the port on the exhaust core tube located inside the separation chamber is configured as an open structure.

[0019] In some optional embodiments, the drain pipe includes a first conical section and a second conical section, the larger diameter section of the first conical section is connected to the conical section, the smaller diameter section of the first conical section is connected to the larger diameter section of the second conical section, and the diameter of the first conical section is smaller than the diameter of the second conical section.

[0020] In some alternative embodiments, the diameter of the first tapered tube segment is configured to be 0.7 to 0.9 times the diameter of the inner port of the separation chamber on the exhaust core tube.

[0021] In some alternative embodiments, the first entrance is arranged directly opposite the second entrance.

[0022] In some alternative embodiments, the atomizing nozzle is configured as a pressure nozzle.

[0023] In some alternative embodiments, the number of the separating devices is configured to be multiple, and the multiple separating devices are arranged in a circular or spiral arrangement.

[0024] Secondly, this application provides a method for separating impurities from raw natural gas, implemented based on the raw natural gas impurity separation system described in the first aspect, comprising the following:

[0025] The first inlet and the second inlet are connected to the raw natural gas supply port and the eluent supply port, respectively. The flow rate ratio of the raw natural gas to the atomized eluent is configured to be 1 to 2:1. The flow rate of the raw natural gas is configured to maintain a swirling flow in the separation chamber for 0.05 to 2 seconds. The flow rate of the eluent is configured to be 2 to 50 g when the feed rate of the raw natural gas is 1 cubic meter.

[0026] After the eluent enters the purification device through the separation device and the purification device becomes saturated with adsorption, demineralized water is introduced into the purification device to replace the eluent.

[0027] The organic regenerated liquid is passed into a purification device to regenerate the adsorbent;

[0028] The demineralized water is passed into the purification device to replace the organic regenerated liquid;

[0029] The demineralized water is replaced by the eluent in the purification device.

[0030] In some optional embodiments, the eluent is configured as a mixture of one or more of MDEA, DEA, water, sulfolane, and piperazine.

[0031] In some optional embodiments, the atomizing nozzle is configured such that the particle size of the eluent is 20–50 μm after the eluent is atomized.

[0032] In some alternative embodiments, the organic regenerated liquid is configured as methanol, ethanol, isopropanol, or acetone.

[0033] Compared with the prior art, this application has the following advantages and beneficial effects:

[0034] This application provides a system and method for separating impurities from raw natural gas. The system allows for the simultaneous introduction of raw natural gas and eluent into a separation chamber via a first inlet and a second inlet. The eluent, atomized by an atomizing nozzle, has a large surface area, increasing the contact points between the eluent and the raw natural gas. The raw natural gas enters the separation chamber with a high swirling velocity. Since the inlet direction of the second inlet is opposite to the swirling direction of the raw natural gas, the atomized eluent and the swirling raw natural gas can briefly collide to create turbulence. This ensures thorough and uniform mixing of the eluent and the raw natural gas, thereby improving the elution effect, increasing impurity removal efficiency, improving the quality of the separated raw natural gas, and reducing the probability of amine contamination. The eluent containing impurities can be regenerated through a flash evaporation device, a filtration device, a purification device, and a removal agent trap to achieve recycling, thus reducing operating costs. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the exemplary embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0036] Figure 1 This is a schematic diagram of the connection of the impurity separation system in the raw natural gas provided in an embodiment of this application;

[0037] Figure 2 This is a schematic diagram of the separation device structure provided in the embodiments of this application;

[0038] Figure 3 This is a simplified cross-sectional structural diagram of the separation device provided in the embodiments of this application;

[0039] Figure 4 This is a top view of the separation device provided in an embodiment of this application;

[0040] Figure 5 A velocity vector reference diagram of the raw material natural gas and eluent after entering the separation chamber, provided for embodiments of this application.

[0041] The attached diagram shows the markings and corresponding component names:

[0042] 1-Separation device, 11-First inlet, 12-Exhaust core pipe, 13-Drain pipe, 14-Cylindrical section, 15-Conical section, 16-Second inlet, 2-Flash evaporation device, 3-Filtration device, 4-Purification device, 5-Removing agent trap, 6-Eluent circulation pump, 7-Regenerated liquid pump. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0044] Firstly, you can refer to this as well. Figures 1-5 This application provides a system for separating impurities in raw natural gas. The system includes a separation device 1, a flash evaporation device 2, a filtration device 3, a purification device 4, and a desiccant collector 5. The separation device 1 includes a separation chamber, an exhaust core pipe 12, and a drain pipe 13.

[0045] The separation chamber is a hollow body and can adopt an existing cyclone separator chamber. That is, the separation chamber can have a cylindrical section 14 and a conical section 15. A first inlet 11 and a second inlet 16 are provided on the side wall of the cylindrical section 14. The first inlet 11 is used to connect to the raw material natural gas supply port, and the second inlet 16 is used to connect to the eluent supply port. The cross-sectional shapes of the first inlet 11 and the second inlet 16 can be the same or different. The type of cross-sectional shape of the first inlet 11 and the second inlet 16 is not limited; they can be set as circular, square, triangular, or other irregular shapes. Preferably, the cross-sectional shape of both the first inlet 11 and the second inlet 16 can be set as square for ease of processing. An atomizing nozzle is provided inside the second inlet 16, so that after the eluent flows through the second inlet 16, it can be converted into fine droplets and bubbles, which can greatly increase the contact probability between the eluent and impurities in the raw material natural gas. This design improves the elution effect. The outlet direction of the second inlet 16 is opposite to the swirling direction of the raw natural gas. This means that when the raw natural gas is introduced through the first inlet 11 alone, its swirling direction in the cylindrical section 14 is clockwise. When the eluent is introduced through the second inlet 16 alone, its swirling direction in the cylindrical section 14 is counterclockwise. This allows the eluent, after being atomized and entering the separation chamber, to briefly collide with the raw natural gas. At this time, the raw natural gas and the atomized eluent can form small turbulences in the separation chamber, meaning the atomized eluent can be fully and evenly mixed with the raw natural gas. This improves the elution effect. Furthermore, the first inlet 11 and the second inlet 16 are aligned axially in the cylindrical section 14, ensuring that the raw natural gas has a high swirling velocity before impacting the eluent, thus improving the mixing effect between the raw natural gas and the atomized eluent.

[0046] The exhaust core pipe 12 is connected to one axial end of the cylindrical section 14 and communicates with the interior of the separation chamber.

[0047] The drain pipe 13 is connected to one axial end of the cone section 15 and communicates with the inside of the separation chamber.

[0048] The flash evaporator 2 is connected to the drain pipe 13. Specifically, the flash evaporator 2 can be configured as a flash tank. After the eluent washes the raw natural gas, it forms droplets with a larger diameter, which enter the flash tank through the drain pipe 13. The flash tank can separate the raw natural gas entrained in the eluent.

[0049] The filter device 3 is connected to the flash evaporator 2. After the raw natural gas is separated by the flash evaporator, the eluent enters the filter device 3, which can filter out solid impurities in the eluent.

[0050] The purification device 4 is connected to the filter device 3. The eluent is filtered by the filter device 3 and then enters the purification device 4. The purification device 4 can be configured as a packed tower. The packed tower is filled with an adsorbent, which can remove foaming impurities from the eluent.

[0051] The remover trap 5 is connected to the purification device 4. After the eluent is purified, it enters the remover trap 5. The remover trap 5 can remove the adsorbent entrained in the eluent, so that the eluent can meet the standard for reuse. An eluent circulation pump 6 can be set between the remover trap 5 and the second inlet 16 to control the flow rate, flow rate and other parameters of the eluent entering the separation chamber.

[0052] In operation, the raw natural gas enters the cylindrical section 14 of the separation chamber through the first inlet 11, forming a swirling flow within it. Simultaneously, the eluent enters the separation chamber through the second inlet 16. The atomizing nozzles within the second inlet 16 atomize the eluent, making it appear as a gaseous flow. Since the outlet direction of the second inlet 16 is opposite to the swirling flow direction of the raw natural gas, the atomized eluent briefly collides with the swirling raw natural gas. At this time, a small turbulence is formed near the second inlet 16 between the raw natural gas and the atomized eluent. The atomized eluent has a larger contact area with the raw natural gas, so the raw natural gas can be fully mixed with the eluent during a brief impact. The eluent can combine with impurities in the raw natural gas to form large-diameter droplets. Under the action of gravity, the large-diameter droplets are discharged through the drain pipe 13 and then pass through the flash evaporator 2, filter 3, purification device 4 and descaling agent trap 5 in sequence to regenerate the eluent. The eluent discharged through the descaling agent trap 5 is introduced into the separation chamber through the second inlet 16 to reuse the eluent. The raw natural gas that has been treated by descaling and cyclone separation is discharged from the exhaust core pipe 12 for subsequent processing.

[0053] The impurity separation system for raw natural gas provided in this application embodiment has a second inlet 16 on the separation chamber, and an atomizing nozzle is installed in the second inlet 16. The eluent can be directly introduced into the separation chamber after atomization, and mix with the raw natural gas in the swirling state in the separation chamber. The mixing effect of the raw natural gas and the eluent is better and more uniform, so the eluent has a better washing effect on the raw natural gas. That is, the quality of the natural gas produced after swirling treatment is better, and the probability of amine liquid being contaminated is greatly reduced, which is conducive to ensuring the normal operation of the purification system / equipment. After washing the raw natural gas, the eluent carries a large number of impurities. The eluent is treated by a flash evaporator 2, a filter 3, a purification device 4, and a removal agent trap 5 so that the eluent can be recycled and reused, reducing costs.

[0054] In some alternative embodiments, the first inlet 11 is configured as a volute structure, meaning that the extension direction of the first inlet 11 is a spiral, and the outlet direction of the first inlet 11 is tangent to the cylindrical section 14.

[0055] In this embodiment, the volute structure guides the raw natural gas, allowing it to form a swirling flow state beforehand. This prevents the natural gas from colliding with the inner wall of the separation chamber upon entry, ensuring stable flow initially. Simultaneously, the volute structure accelerates the flow rate of the natural gas into the separation chamber, reducing the risk of blockage by impurities at the first inlet 11 and improving the mixing effect between the natural gas and the atomized eluent. In practice, the first inlet 11 can be constructed as a 90° or 180° annular volute structure, meaning the angle between the two ends of the first inlet 11 and the center of the cylindrical section 14 is 90° or 180°. This ensures uniformity of the natural gas flow rate.

[0056] In some optional embodiments, the height-to-diameter ratio of the inner cavity of the separation chamber is configured to be 2 to 4, wherein the inner diameter of the cylindrical section 14 is configured to be 75 to 150 cm. This configuration, with sufficient inner cavity space and a reasonable inner diameter, ensures a more uniform distribution of the raw natural gas within the separation chamber, a more stable swirling flow velocity, and a more reasonable mixing time between the raw natural gas and the eluent. This is beneficial for improving the elution and swirling separation effects of the raw natural gas, thereby enhancing the quality of the natural gas produced.

[0057] In some alternative embodiments, the exhaust core tube 12 is configured as a spiral slotted diverter.

[0058] In this embodiment, the spiral slit diverter has a good dispersing effect on the gas, which helps to stabilize the gas flow and prevent the natural gas separated by the swirl from forming turbulence at the exhaust core pipe 12. This ensures that the natural gas is discharged normally and helps to avoid the phenomenon of gas disturbance in the separation chamber caused by the natural gas not being discharged normally.

[0059] In some optional embodiments, the port of the exhaust core tube 12 located inside the separation chamber is flush with the first inlet 11. The raw natural gas flow rate at the first inlet 11 is relatively high. If the height of the exhaust core tube 12 is higher than the first inlet 11, the natural gas after cyclone separation may mix with the raw natural gas at the first inlet 11, causing repeated cyclone separation. Therefore, by setting the port of the exhaust core tube 12 to be flush with the first inlet 11, the natural gas after cyclone separation can be smoothly discharged from the exhaust core tube 12, ensuring the natural gas production efficiency. In actual implementation, the exhaust core tube 12 can be configured as a circular tube, a tapered tube, or a combination of both.

[0060] In some alternative embodiments, the port on the exhaust core tube 12 located inside the separation chamber is configured as an open structure. The open structure facilitates the entry of the natural gas after swirl separation into the exhaust core tube 12, which will help improve the exhaust efficiency of natural gas, thereby ensuring the production efficiency of natural gas.

[0061] In some optional embodiments, the drain pipe 13 includes a first conical section and a second conical section, the larger diameter section of the first conical section is connected to the conical section 15, the smaller diameter section of the first conical section is connected to the larger diameter section of the second conical section, and the diameter of the first conical section is smaller than the diameter of the second conical section.

[0062] In this embodiment, the first conical tube section allows impurities at the elution point to enter quickly, reducing their residence time in the separation chamber and preventing blockage. After entering the first conical tube section, the impurities flow relatively quickly into the second conical tube section. The second conical tube section has a larger diameter than the first, meaning its inner diameter can be set larger, thus regulating the impurity flow rate and facilitating impurity discharge. The statement that the diameter of the first conical tube section is smaller than the diameter of the second conical tube section refers to the diameter at axially equidistant positions. For example, if the first and second conical tube sections have the same axial length, and are placed vertically at any height, the diameter of the second conical tube section will always be larger than the diameter of the first conical tube section. Preferably, the diameter of the first tapered tube section is configured to be 0.7 to 0.9 times the diameter of the inner port of the exhaust core tube 12 located in the separation chamber, that is, the large-diameter port diameter of the first tapered tube section is 0.7 to 0.9 times the diameter of the lower port of the exhaust core tube 12.

[0063] In some optional embodiments, the first inlet 11 is arranged directly opposite the second inlet 16. This arrangement allows the raw natural gas to immediately collide with the atomized eluent upon entering the separation chamber. At this point, the raw natural gas has a high swirling velocity, and the atomized eluent has minimal impact on the raw natural gas during the collision process. This ensures a more stable flow pattern of the raw natural gas within the separation chamber and also improves the mixing efficiency and effect between the raw natural gas and the eluent.

[0064] In some alternative embodiments, the atomizing nozzle is configured as a pressure nozzle.

[0065] In some alternative embodiments, the number of separation devices 1 is configured to be multiple, and the multiple separation devices 1 are arranged in a circular or spiral arrangement.

[0066] Secondly, embodiments of this application provide a method for separating impurities from raw natural gas, implemented based on the impurity separation system for raw natural gas described in the first aspect, including the following:

[0067] The first inlet 11 and the second inlet 16 are respectively connected to the raw natural gas supply port and the eluent supply port. The flow rate ratio of the raw natural gas to the atomized eluent is configured to be 1 to 2:1. The flow rate of the raw natural gas is configured to maintain a swirling flow in the separation chamber for 0.05 to 2 seconds. The flow rate of the eluent is configured to be 2 to 50 g when the feed rate of the raw natural gas is 1 cubic meter.

[0068] The eluent, atomized by the atomizing nozzle, forms droplets with a particle size of 20–50 μm. The height-to-diameter ratio of the separation chamber is configured to be 2–4, the diameter of the cylindrical section 144 is configured to be 75–150 cm, the six separation devices 1 are arranged in a spiral pattern, the first inlet 111 is constructed as a 180° volute structure, the exhaust core pipe 122 is configured as a spiral slit diversion pipe, and the inlets of the first inlet 111 and the second inlet 166 are arranged opposite each other.

[0069] After the eluent enters the purification device 4 through the separation device 1 and the purification device 4 becomes saturated with adsorption, demineralized water is introduced into the purification device 4 to replace the eluent.

[0070] The organic regenerated liquid is passed into the purification device 4 to regenerate the adsorbent.

[0071] The organic regenerated liquid can be pumped into the purification device 4 via the regenerated liquid pump 7. The organic regenerated liquid can clean and purify the inhalant containing impurities, thereby restoring the activity of the adsorbent.

[0072] The demineralized water is introduced into the purification device 4 to replace the organic regenerated liquid and separate the adsorbent and the organic regenerated liquid.

[0073] The adsorbent and demineralized water are separated by replacing the demineralized water with the eluent in the purification device 4.

[0074] In some optional embodiments, the eluent may be configured as a mixture of one or more of MDEA, DEA, water, sulfolane, and piperazine.

[0075] In some alternative embodiments, the organic regenerant can be configured as methanol, ethanol, isopropanol, or acetone.

[0076] Before being put into the impurity separation system in the raw natural gas provided in the embodiments of this application:

[0077]

[0078] After being fed into the impurity separation system for raw natural gas provided in this application embodiment:

[0079]

[0080] Therefore, the impurity separation system in the raw natural gas provided in this application embodiment removes impurities from the raw natural gas using an eluent while performing cyclone separation. The resulting raw natural gas has significantly reduced foaming impurities, the foaming degradation products in the desulfurization solution do not increase significantly, the foaming height is significantly reduced compared to before input, and the defoaming time is significantly shortened.

[0081] As can be seen from the above, the embodiments of this application, by setting a second inlet for the eluent to enter on the separation chamber and setting an atomizing nozzle in the second inlet, and configuring the inlet direction of the second inlet to be opposite to the swirling direction of the raw natural gas in the separation chamber, can significantly improve the impurity removal rate of the raw natural gas. Compared with a general cyclone separator, the removal rate is increased by a factor of two, which can greatly reduce the probability of amine liquid being contaminated, thereby effectively ensuring that the purification system can work normally.

[0082] The specific embodiments described above illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0083] It should be noted that in this specification, similar reference numerals and letters in the above figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing this application 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 on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this application, it should be noted that unless otherwise expressly specified and limited, the terms "installed," "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; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0084] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A system for separating impurities from raw natural gas, characterized in that, It includes a separation device (1), a flash evaporation device (2), a filtration device (3), a purification device (4), and a desiccant collector (5); The separation device (1) includes: The separation chamber has a cylindrical section (14) and a conical section (15). A first inlet (11) and a second inlet (16) are provided on the side wall of the cylindrical section (14). The first inlet (11) is used to connect to the raw material natural gas supply port, and the second inlet (16) is used to connect to the eluent supply port. An atomizing nozzle is provided in the second inlet (16). The outlet direction of the second inlet (16) is arranged opposite to the swirling direction of the raw material natural gas. The first inlet (11) and the second inlet (16) are flush in the axial direction of the cylindrical section (14). Exhaust core pipe (12), the exhaust core pipe (12) is connected to one axial end of the cylindrical section (14) and communicates with the interior of the separation cavity; Drainage pipe (13), the drainage pipe (13) is connected to one axial end of the conical section (15) and communicates with the interior of the separation chamber; The flash evaporation device (2) is connected to the drain pipe (13), the filter device (3) is connected to the flash evaporation device (2), the purification device (4) is connected to the filter device (3), and the remover trap (5) is connected to the purification device (4) and connected to the second inlet (16).

2. The impurity separation system in raw natural gas according to claim 1, characterized in that, The first inlet (11) is constructed as a volute structure.

3. The impurity separation system for raw natural gas according to claim 1 or 2, characterized in that, The first inlet (11) is constructed as a 90° or 180° annular volute structure.

4. The impurity separation system in raw natural gas according to claim 1, characterized in that, The height-to-diameter ratio of the inner cavity of the separation chamber is configured to be 2 to 4, wherein the inner diameter of the cylindrical section (14) is configured to be 75 to 150 cm.

5. The impurity separation system in raw natural gas according to claim 1, characterized in that, The exhaust core pipe (12) is configured as a spiral slit diverter.

6. The impurity separation system in raw natural gas according to claim 5, characterized in that, The port on the exhaust core pipe (12) located inside the separation chamber is flush with the first inlet (11).

7. The impurity separation system for raw natural gas according to claim 5 or 6, characterized in that, The exhaust core tube (12) is configured as a round tube, a tapered tube, or a combination of the two.

8. The impurity separation system in raw natural gas according to claim 5, characterized in that, The port on the exhaust core pipe (12) located inside the separation cavity is constructed as an open structure.

9. The impurity separation system in raw natural gas according to claim 1, characterized in that, The drain pipe (13) includes a first conical section and a second conical section. The larger diameter section of the first conical section is connected to the conical section (15), and the smaller diameter section of the first conical section is connected to the larger diameter section of the second conical section. The diameter of the first conical section is smaller than the diameter of the second conical section.

10. The impurity separation system in raw natural gas according to claim 9, characterized in that, The diameter of the first tapered tube section is configured to be 0.7 to 0.9 times the diameter of the inner port of the separation chamber on the exhaust core tube (12).

11. The impurity separation system in raw natural gas according to claim 1, characterized in that, The first entrance (11) is positioned directly opposite the second entrance (16).

12. The impurity separation system in raw natural gas according to claim 1, characterized in that, The atomizing nozzle is configured as a pressure nozzle.

13. The impurity separation system in raw natural gas according to claim 1, characterized in that, The number of the separation devices (1) is configured to be multiple, and the multiple separation devices (1) are arranged in a circular or spiral arrangement.

14. A method for separating impurities from raw natural gas, implemented based on the raw natural gas impurity separation system as described in any one of claims 1 to 13, characterized in that, Includes the following: The first inlet (11) and the second inlet (16) are respectively connected to the raw material natural gas supply port and the eluent supply port. The flow rate ratio of the raw material natural gas to the atomized eluent is configured to be 1 to 2:

1. The flow rate of the raw material natural gas is configured to maintain a swirling flow in the separation chamber for 0.05 to 2 seconds. The flow rate of the eluent is configured to be 2 to 50 g when the feed rate of the raw material natural gas is 1 cubic meter. After the eluent enters the purification device (4) through the separation device (1) and the purification device (4) is saturated with adsorption, demineralized water is introduced into the purification device (4) to replace the eluent therein. The organic regenerated liquid is passed into the purification device (4) to regenerate the adsorbent; The demineralized water is introduced into the purification device (4) to replace the organic regenerated liquid; The demineralized water is replaced by the eluent in the purification device (4).

15. The method for separating impurities from raw natural gas according to claim 14, characterized in that, The eluent is configured as a mixture of one or more of MDEA, DEA, water, sulfolane, and piperazine.

16. The method for separating impurities from raw natural gas according to claim 14, characterized in that, The atomizing nozzle is configured such that the particle size of the eluent is 20–50 μm after atomization.

17. The method for separating impurities from raw natural gas according to claim 14, characterized in that, The organic regenerated liquid is prepared as methanol, ethanol, isopropanol or acetone.

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