Separation device, system and method for impurities in raw material natural gas

Abstract

The invention relates to the technical field of natural gas treatment, in particular to a separation device, system and method for impurities in raw natural gas. The 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, the first inlet is used for being connected with a raw material natural gas supply port, the second inlet is used for being connected with an eluent supply port, and 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 in the axial direction of the cylinder section; the exhaust core pipe is connected to one axial end of the cylindrical section and is communicated with the interior of the separation cavity; and the liquid discharge pipe is connected to one axial end of the conical cylinder section and is communicated with the interior of the separation cavity. According to the invention, the impurity removal rate of the raw material natural gas can be obviously improved, and the probability that the amine liquid is polluted can be greatly reduced, so that the normal operation of purification equipment can be ensured.

Description

Technical Field

[0001] This application relates to the field of natural gas processing technology, specifically to a device, 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 the natural gas purification unit; among these, malfunctions caused by contamination from foreign contaminants are particularly 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 device, 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 be mixed with the eluent inside the cyclone separator to remove impurities from the raw natural gas, 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 device for separating impurities in raw natural gas, comprising:

[0007] 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.

[0008] An exhaust core pipe is connected to one axial end of the cylindrical section and communicates with the interior of the separation chamber.

[0009] A drain pipe is connected to one axial end of the conical section and communicates with the interior of the separation chamber.

[0010] In some alternative embodiments, the first inlet is configured as a volute structure.

[0011] In some alternative embodiments, the first inlet is configured as a 90° or 180° annular volute structure.

[0012] In some optional embodiments, the height-to-diameter ratio of the inner cavity of the separation chamber is configured to be 3 to 6, wherein the inner diameter of the cylindrical section is configured to be 75 to 150 cm.

[0013] In some alternative embodiments, the exhaust core tube is configured as a spiral slotted diverter.

[0014] In some alternative embodiments, the port on the exhaust core tube located inside the separation chamber is flush with the first inlet.

[0015] In some alternative embodiments, the exhaust core tube is configured as a round tube, a tapered tube, or a combination of the two.

[0016] In some alternative embodiments, the port on the exhaust core tube located inside the separation chamber is configured as an open structure.

[0017] 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.

[0018] 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.

[0019] In some alternative embodiments, the first entrance is arranged directly opposite the second entrance.

[0020] In some alternative embodiments, the atomizing nozzle is configured as a pressure nozzle.

[0021] Secondly, this application provides a system for separating impurities in raw natural gas, including multiple separation devices for impurities in raw natural gas as described in the first aspect, wherein the multiple separation devices for impurities in raw natural gas are arranged in a circular or spiral arrangement.

[0022] Thirdly, this application provides a method for separating impurities from raw natural gas, implemented based on the impurity separation system for raw natural gas described in the second aspect, comprising the following:

[0023] Connect the first inlet and the second inlet to the raw material natural gas supply port and the eluent supply port, respectively;

[0024] 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 eluent is configured to be 5 to 10 g when the feed rate of the raw natural gas is 1 cubic meter, and the pressure difference between the eluent and the raw natural gas is configured to be 0.1 to 0.3 MPa.

[0025] In some optional embodiments, the eluent is configured as a mixture of one or more of MDEA, DEA, water, sulfolane, and piperazine.

[0026] In some optional embodiments, the atomizing nozzle is configured such that, after the eluent is atomized, the particle size of the eluent is 2 to 10 times the median particle size of impurities in the feedstock natural gas.

[0027] Compared with the prior art, this application has the following advantages and beneficial effects:

[0028] This application provides a device, system, and method for separating impurities in raw natural gas. The device 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 form turbulence. This allows the eluent to be thoroughly and uniformly mixed with the raw natural gas, thereby improving the elution effect, increasing impurity removal efficiency, improving the quality of the product after separation, and reducing the probability of amine contamination. Attached Figure Description

[0029] 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:

[0030] Figure 1 A schematic diagram of the structure of the impurity separation device in the raw natural gas provided in the embodiments of this application;

[0031] Figure 2 A simplified cross-sectional structural diagram of the device for separating impurities in raw natural gas provided in this application embodiment;

[0032] Figure 3 A top view of the structure of the device for separating impurities in raw natural gas provided in the embodiments of this application;

[0033] Figure 4 A velocity vector reference diagram of the raw material natural gas and eluent after entering the separation chamber, provided in the embodiments of this application;

[0034] Figure 5 This is a simplified structural diagram of a system for separating impurities in raw natural gas, provided in an embodiment of this application.

[0035] The attached diagram shows the markings and corresponding component names:

[0036] 1-First inlet, 2-Exhaust core pipe, 3-Drain pipe, 4-Cylindrical section, 5-Conical section, 6-Second inlet. Detailed Implementation

[0037] 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.

[0038] Example 1:

[0039] Firstly, you can refer to this as well. Figures 1-4 This application provides a device for separating impurities in raw natural gas, which includes a separation chamber, an exhaust core pipe 2, and a drain pipe 3.

[0040] The separation chamber is a hollow body and can adopt an existing cyclone separator chamber, i.e., the separation chamber can have a cylindrical section 4 and a conical section 5. A first inlet 1 and a second inlet 6 are provided on the side wall of the cylindrical section 4. The first inlet 1 is used to connect to the raw material natural gas supply port, and the second inlet 6 is used to connect to the eluent supply port. The cross-sectional shapes of the first inlet 1 and the second inlet 6 can be the same or different. The type of cross-sectional shape of the first inlet 1 and the second inlet 6 is not limited; they can be set as circular, square, triangular, or other irregular shapes. Preferably, the cross-sectional shapes of both the first inlet 1 and the second inlet 6 can be set as square for ease of processing. An atomizing nozzle is provided inside the second inlet 6, so that after the eluent flows through the second inlet 6, 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, thus improving efficiency. To improve the elution effect, the outlet direction of the second inlet 6 is arranged opposite to the swirling direction of the raw natural gas. This means that when the raw natural gas is introduced through the first inlet 1 alone, the swirling direction of the raw natural gas in the cylindrical section 4 is clockwise. When the eluent is introduced through the second inlet 6 alone, the swirling direction of the eluent in the cylindrical section 4 is counterclockwise. Thus, after the eluent is atomized and enters the separation chamber, it can form a brief collision with the raw natural gas. At this time, the raw natural gas and the atomized eluent can form a small turbulence in the separation chamber. That is, the atomized eluent can be fully and evenly mixed with the raw natural gas, which will help improve the elution effect. In the axial direction of the cylindrical section 4, the first inlet 1 and the second inlet 6 are aligned, thus ensuring that the raw natural gas has a large swirling velocity before impacting the eluent, improving the mixing effect of the raw natural gas and the atomized eluent.

[0041] The exhaust core pipe 2 is connected to one axial end of the cylindrical section 4 and communicates with the inside of the separation chamber.

[0042] The drain pipe 3 is connected to one axial end of the cone section 5 and communicates with the inside of the separation chamber.

[0043] In operation, the raw natural gas enters the cylindrical section 4 of the separation chamber through the first inlet 1, forming a swirling flow within the cylindrical section 4. Simultaneously, the eluent enters the separation chamber through the second inlet 6. The atomizing nozzle within the second inlet 6 atomizes the eluent, making it resemble a gas flow. Since the outlet direction of the second inlet 6 is opposite to the swirling flow direction of the raw natural gas, the atomized eluent can briefly collide with the swirling raw natural gas. At this time, a small turbulence is formed near the second inlet 6. The atomized eluent has a larger contact area with the raw natural gas, allowing the raw natural gas to mix thoroughly with the eluent during the brief collision. The eluent combines with impurities in the raw natural gas to form large-diameter droplets, which are discharged through the drain pipe 3 under gravity. The raw natural gas, after being separated and swirling, is discharged through the exhaust core pipe 2 for further processing.

[0044] The impurity separation device for raw natural gas provided in this application embodiment has a second inlet 6 on the separation chamber and an atomizing nozzle inside the second inlet 6. The eluent can be directly introduced into the separation chamber after atomization and mixed 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.

[0045] In some alternative embodiments, the first inlet 1 is constructed as a volute structure, meaning that the extension direction of the first inlet 1 is a spiral, and the outlet direction of the first inlet 1 is tangent to the cylindrical section 4.

[0046] In this embodiment, the volute structure guides the raw natural gas, allowing it to form a swirling flow state beforehand. This prevents the raw 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 raw natural gas into the separation chamber, reducing the risk of blockage by impurities at the first inlet 1 and improving the mixing effect between the raw natural gas and the atomized eluent. In practice, the first inlet 1 can be constructed as a 90° or 180° annular volute structure, meaning the angle between the two ends of the first inlet 1 and the center of the cylindrical section 4 is 90° or 180°. This helps ensure uniformity of the raw natural gas flow rate.

[0047] In some optional embodiments, the height-to-diameter ratio of the inner cavity of the separation chamber is configured to be 3–6, wherein the inner diameter of the cylindrical section 4 is configured to be 75–150 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.

[0048] In some alternative embodiments, the exhaust core tube 2 is configured as a spiral slotted diverter.

[0049] 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 2. 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.

[0050] In some optional embodiments, the port of the exhaust core pipe 2 located inside the separation chamber is flush with the first inlet 1. The raw natural gas flow rate at the first inlet 1 is relatively high. If the height of the exhaust core pipe 2 is higher than the first inlet 1, the natural gas after cyclone separation may mix with the raw natural gas at the first inlet 1, causing repeated cyclone separation. Therefore, by setting the port of the exhaust core pipe 2 to be flush with the first inlet 1, the natural gas after cyclone separation can be smoothly discharged from the exhaust core pipe 2, ensuring the natural gas production efficiency. In actual implementation, the exhaust core pipe 2 can be configured as a circular pipe, a tapered pipe, or a combination of both.

[0051] In some alternative embodiments, the port on the exhaust core pipe 2 located inside the separation chamber is configured as an open structure. This open structure facilitates the entry of the natural gas after swirl separation into the exhaust core pipe 2, which will improve the natural gas discharge efficiency and thus ensure natural gas production efficiency.

[0052] In some optional embodiments, the drain pipe 3 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 5, 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.

[0053] 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 2 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 2.

[0054] In some optional embodiments, the first inlet 1 is arranged directly opposite the second inlet 6. 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.

[0055] In some alternative embodiments, the atomizing nozzle is configured as a pressure nozzle.

[0056] Secondly, embodiments of this application provide a system for separating impurities in raw natural gas, which can be referred to... Figure 5 This includes multiple separation devices for impurities in the raw natural gas, as described in the first aspect, which are arranged in a circular or spiral pattern.

[0057] Thirdly, 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 second aspect, including the following:

[0058] Connect the first inlet 1 and the second inlet 6 to the raw material natural gas supply port and the eluent supply port, respectively;

[0059] The gas flow rate of the raw material natural gas can be configured to be 11-12 m / s, the flow rate of the eluent after atomization is 5.5-12 m / s, the flow rate of the eluent is configured to be 5-10 g when the feed rate of the raw material natural gas is 1 cubic meter, and the pressure difference between the eluent and the raw material natural gas is configured to be 0.1-0.3 MPa.

[0060] In some optional embodiments, the eluent is configured as a mixture of one or more of MDEA, DEA, water, sulfolane, and piperazine.

[0061] In some optional embodiments, the atomizing nozzle is configured such that, after the eluent is atomized, the particle size of the eluent is 2 to 10 times the median particle size of impurities in the feedstock natural gas.

[0062] Example 2:

[0063] This embodiment is an application example based on Embodiment 1.

[0064] Application Example 1:

[0065] The flow rate of the raw natural gas was configured to be 600 × 10 4 m 3 / d, gas velocity 12m / s, entrained impurity particle size range: 0.09-20um, concentration (under standard conditions): 2.34mg / m³ 3 .

[0066] The separation chamber has a height-to-diameter ratio of 4, a cylindrical section 4 with a diameter of 100 cm, and six separation devices arranged in a spiral configuration. The first inlet 1 is constructed as a 180° volute structure, the exhaust core pipe 2 is configured as a spiral slit diversion pipe, the diameter of the first conical section is 0.8 times the port diameter of the exhaust core pipe 2, the inlets of the first inlet 1 and the second inlet 6 are arranged opposite each other, the atomizing nozzle is configured such that after the eluent is atomized, the particle size of the eluent is 60-100 μm, the eluent flow rate is 12 m / s, the eluent is configured as an MDEA aqueous solution, and the eluent flow rate is configured such that when the feed natural gas feed rate is 1 cubic meter, the eluent feed rate is 5 g.

[0067] Comparative Example 1:

[0068] The flow rate of the raw natural gas was configured to be 600 × 10 4 m 3 / d, gas velocity 12m / s, entrained impurity particle size range: 0.09-20um, concentration (under standard conditions): 2.34mg / m³ 3 .

[0069] The separation chamber has a height-to-diameter ratio of 4, the cylindrical section 4 has a diameter of 100cm, the six separation devices are arranged in a spiral, the first inlet 1 is constructed as a 180° volute structure, the exhaust core pipe 2 is configured as a spiral slit diversion pipe, and the diameter of the first tapered pipe section is 0.8 times the port diameter of the exhaust core pipe 2.

[0070] The produced natural gas was tested, and in Application Example 1, the impurity particle size was 0.09–0.8 μm, and the concentration was 0.058 mg / m³.3 The impurity removal rate was 97.51%, and the impurity particle size in Comparative Example 1 was 0.04–1.3 μm, with a concentration of 1.505 mg / m³. 3 The removal rate was 35.67%, and the removal rate in application example 1 increased exponentially.

[0071] Application Example 2:

[0072] The flow rate of the raw natural gas was configured to be 300 × 10 4 m 3 / d, gas velocity 11m / s, entrained impurity particle size range: 0.18-1.9um, concentration (under standard conditions): 1.71mg / m³ 3 .

[0073] The separation chamber has a height-to-diameter ratio of 3, a cylindrical section 4 with a diameter of 85 cm, and four separation devices arranged circumferentially. The first inlet 1 is constructed as a 90° volute structure, the exhaust core pipe 2 is configured as a spiral slit diversion cone pipe, the diameter of the first cone pipe section is 0.7 times the diameter of the exhaust core pipe 2 port, the inlet directions of the first inlet 1 and the second inlet 6 are perpendicular, the atomizing nozzle is configured such that after the eluent is atomized, the particle size of the eluent is 20-50 μm, the eluent flow rate is 7.33 m / s, the eluent is configured as a mixed solution of MDEA, sulfolane, and water, and the eluent flow rate is configured such that when the feed natural gas feed rate is 1 cubic meter, the eluent feed rate is 10 g.

[0074] Comparative Example 2:

[0075] The flow rate of the raw natural gas was configured to be 300 × 10 4 m 3 / d, gas velocity 11m / s, entrained impurity particle size range: 0.18-1.9um, concentration (under standard conditions): 1.71mg / m³ 3 .

[0076] The separation chamber has a height-to-diameter ratio of 3, the cylindrical section 4 has a diameter of 85cm, the four separation devices are arranged in a circle, the first inlet 1 is constructed as a 90° volute structure, the exhaust core pipe 2 is configured as a spiral slit diversion cone pipe, and the diameter of the first cone pipe section is 0.7 times the diameter of the exhaust core pipe 2 port.

[0077] The produced natural gas was tested, and in Application Example 2, the impurity particle size was 0.08–0.6 μm, and the concentration was 0.028 mg / m³. 3 The impurity removal rate was 98.36%, and the impurity particle size in Comparative Example 2 was 0.08–1.2 μm, with a concentration of 1.177 mg / m³. 3 The removal rate was 31.18%, and the removal rate in application example 2 increased exponentially.

[0078] Application Example 3:

[0079] The flow rate of the raw natural gas was configured to be 400 × 10 4 m 3 / d, gas velocity 11m / s, entrained impurity particle size range: 0.10~3.2um, concentration (under standard conditions): 1.05mg / m³ 3 .

[0080] The separation chamber has a height-to-diameter ratio of 5, a cylindrical section 4 with a diameter of 75 cm, and four separation devices arranged in a circular pattern. The first inlet 1 is constructed as a 90° volute structure, the exhaust core pipe 2 is configured as a conical spiral slit diversion type, the diameter of the first conical pipe section is 0.9 times the diameter of the exhaust core pipe 2 port, the inlet direction angle between the first inlet 1 and the second inlet 6 is 120°, the atomizing nozzle is configured such that after the eluent is atomized, the particle size of the eluent is 50-80 μm, the eluent flow rate is 5.5 m / s, the eluent is configured as a mixed solution of MDEA, sulfolane, and water, and the eluent flow rate is configured such that when the feed natural gas feed rate is 1 cubic meter, the eluent feed rate is 8 g.

[0081] Comparative Example 3:

[0082] The flow rate of the raw natural gas was configured to be 400 × 10 4 m 3 / d, gas velocity 11m / s, entrained impurity particle size range: 0.10-3.2um, concentration (under standard conditions): 1.05mg / m³ 3 .

[0083] The separation chamber has a height-to-diameter ratio of 5, the cylindrical section 4 has a diameter of 75cm, the four separation devices are arranged in a circle, the first inlet 1 is constructed as a 90° volute structure, the exhaust core pipe 2 is configured as a conical spiral slit diversion type, and the diameter of the first conical pipe section is 0.9 times the port diameter of the exhaust core pipe 2.

[0084] The produced natural gas was tested, and in Application Example 3, the impurity particle size was 0.07–0.8 μm, and the concentration was 0.037 mg / m³. 3 The impurity removal rate was 96.48%, and the impurity particle size in Comparative Example 3 was 0.06–1.3 μm, with a concentration of 0.82 mg / m³. 3 The removal rate was 21.90%, and the removal rate in application example 3 showed a multiple increase.

[0085] As can be seen from the above, the embodiments of this application, by setting a second inlet 6 for the eluent to enter on the separation chamber and setting an atomizing nozzle in the second inlet 6, and configuring the inlet direction of the second inlet 6 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.

[0086] 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.

[0087] 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.

[0088] 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 device for separating impurities from raw natural gas, characterized in that, include: The separation chamber has a cylindrical section (4) and a conical section (5). A first inlet (1) and a second inlet (6) are provided on the side wall of the cylindrical section (4). The first inlet (1) is used to connect to the raw material natural gas supply port, and the second inlet (6) is used to connect to the eluent supply port. An atomizing nozzle is provided in the second inlet (6). The outlet direction of the second inlet (6) is arranged opposite to the swirling direction of the raw material natural gas. The first inlet (1) and the second inlet (6) are flush with each other in the axial direction of the cylindrical section (4). Exhaust core pipe (2), the exhaust core pipe (2) is connected to one axial end of the cylindrical section (4) and communicates with the interior of the separation cavity; The drain pipe (3) is connected to one axial end of the conical section (5) and communicates with the interior of the separation chamber.

2. The apparatus for separating impurities in raw natural gas according to claim 1, characterized in that, The first inlet (1) is constructed as a volute structure.

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

4. The apparatus for separating impurities 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 3 to 6, wherein the inner diameter of the cylindrical section (4) is configured to be 75 to 150 cm.

5. The apparatus for separating impurities in raw natural gas according to claim 1, characterized in that, The exhaust core tube (2) is configured as a spiral slit diverter.

6. The apparatus for separating impurities in raw natural gas according to claim 5, characterized in that, The port on the exhaust core pipe (2) located inside the separation chamber is flush with the first inlet (1).

7. The apparatus for separating impurities in raw natural gas according to claim 5 or 6, characterized in that, The exhaust core tube (2) is configured as a round tube, a tapered tube, or a combination of the two.

8. The apparatus for separating impurities in raw natural gas according to claim 5, characterized in that, The port on the exhaust core pipe (2) located inside the separation chamber is constructed as an open structure.

9. The apparatus for separating impurities in raw natural gas according to claim 1, characterized in that, The drain pipe (3) 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 (5). 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 apparatus for separating impurities 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 (2).

11. The apparatus for separating impurities in raw natural gas according to claim 1, characterized in that, The first entrance (1) is positioned directly opposite the second entrance (6).

12. The apparatus for separating impurities in raw natural gas according to claim 1, characterized in that, The atomizing nozzle is configured as a pressure nozzle.

13. A system for separating impurities from raw natural gas, characterized in that, It includes multiple separation devices for impurities in raw natural gas as described in any one of claims 1 to 12, wherein the multiple separation devices for impurities in raw natural gas are arranged in a circular or spiral arrangement.

14. A method for separating impurities from raw natural gas, implemented based on the impurity separation system for raw natural gas as described in claim 13, characterized in that, Includes the following: Connect the first inlet (1) and the second inlet (6) to the raw material 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 eluent is configured to be 5 to 10 g when the feed rate of the raw natural gas is 1 cubic meter, and the pressure difference between the eluent and the raw natural gas is configured to be 0.1 to 0.3 MPa.

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, after the eluent is atomized, the particle size of the eluent is 2 to 10 times the median particle size of impurities in the feedstock natural gas.

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