A compact standpipe layout natural gas absorption and deacidification purification device

Abstract

The present invention provides a compact vertical pipe layout natural gas absorption deacidification purification device, in which a tubular atomization mixing mass transfer section is connected to a liquid flow channel with a liquid injection port, the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section are arranged in parallel in a U shape, the tubular gas-liquid separation section includes an outer tube and a cyclone separation tube located inside the outer tube, the inlet of the cyclone separation tube is connected to the gas-liquid outlet of the pipeline side wall of the tubular atomization mixing mass transfer section; there is an annular space between the cyclone separation tube and the outer tube, an exhaust pipe is provided at the top of the outer tube, there is a liquid discharge annular gap between the exhaust pipe and the top of the cyclone separation tube, the liquid discharge annular gap is connected to the annular space, and a secondary liquid discharge port is provided at the bottom of the outer tube. The present invention combines tubular atomization mixing mass transfer with tubular gas-liquid separation, and proposes a vertical pipe layout natural gas absorption deacidification treatment device for natural gas deacidification purification treatment, which has the characteristics of high gas-liquid mass transfer efficiency, compact structure, large processing capacity, and simple operation.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas gathering, transportation, purification and processing, and in particular to a natural gas absorption and deacidification purification device with a compact riser layout. Background Art

[0002] When the acid gas content in the natural gas extracted from the underground gas reservoir exceeds the standard, the natural gas needs to be deacidified and purified to meet the quality index requirements of long-distance pipeline transportation, liquefaction processing and commercial natural gas for acid gas. Among the current natural gas deacidification processes, the chemical solvent absorption method based on alcohol amine solution has strong processing capacity and high purification degree, so it is the most widely used in industry.

[0003] In the prior art, CN 107974320A proposes a highly efficient natural gas deacidification device, the main structure of which includes components such as a deacidification tower, a spherical arc plate, a deacidification pipe, a diversion sleeve, an amine liquid diversion plate, and a sponge layer. An acid gas inlet is provided at the bottom of the deacidification tower, and the spherical arc plate is provided with a plurality of air holes and connected to the deacidification pipe and the diversion sleeve, and the amine liquid flows into the diversion sleeve evenly. However, this device still adopts a traditional tower device, which has the disadvantages of complex internal structure, large volume, low gas-liquid mass transfer efficiency, and high transportation and installation costs.

[0004] The applicant has found that the prior art has at least the following technical problems: the natural gas absorption and deacidification system in the prior art generally adopts tower-type gas-liquid absorption and mass transfer equipment such as bubble absorption tower and packed absorption tower, but such equipment generally has disadvantages such as low mass transfer efficiency, large weight and large floor space, and it is difficult to meet the requirements of equipment size and weight on offshore platforms and remote areas on land. Therefore, a compact natural gas absorption and deacidification purification device and method is urgently needed. Summary of the invention

[0005] The purpose of the present invention is to provide a compact standpipe layout natural gas absorption and deacidification purification device to solve the technical problems of low mass transfer efficiency and large floor space of tower-type gas-liquid absorption mass transfer equipment in the prior art. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The compact standpipe layout natural gas absorption and deacidification purification device provided by the present invention comprises a tubular atomization mixing mass transfer section and a tubular gas-liquid separation section, wherein:

[0008] The top and bottom ends of the tubular atomizing mixing and mass transfer section are respectively provided with an acid gas inlet and a primary liquid discharge port, and the tubular atomizing mixing and mass transfer section is connected to a liquid flow channel having a liquid injection port;

[0009] The tubular atomization mixing mass transfer section and the tubular gas-liquid separation section are arranged in parallel and have a U-shaped structure. The tubular gas-liquid separation section includes an outer tube and a cyclone separation tube located inside the outer tube. The inlet of the cyclone separation tube is connected to the gas-liquid outlet of the pipe side wall of the tubular atomization mixing mass transfer section to generate a cyclone centrifugal force.

[0010] An annular space exists between the cyclone separation tube and the outer tube, an exhaust pipe is provided at the top of the outer tube, a drainage annular gap exists between the exhaust pipe and the top of the cyclone separation tube, the drainage annular gap is connected with the annular space, and a secondary drainage port is provided at the bottom of the outer tube.

[0011] Preferably, a purified gas outlet is provided at the top of the exhaust pipe, and the axes of the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section are arranged in parallel. The number of the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section is one group or more than two groups. When the number of the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section is more than two groups, each group of structures is arranged in series horizontally or vertically, and the purified gas outlet of the tubular gas-liquid separation section of the upper level is connected to the acid gas inlet of the tubular atomization mixing mass transfer section of the lower level.

[0012] Preferably, the tubular atomization mixing mass transfer section comprises a gas steady flow straight pipe section, a gas contraction acceleration section, an annular gap throat, a gas-liquid dispersion expansion section, and a contact mixing mass transfer pipe which are sequentially connected along the gas flow direction, wherein:

[0013] The inner diameter of the gas contraction acceleration section gradually decreases in the direction away from the gas steady flow straight pipe section, and the inner diameter of the gas-liquid dispersion expansion section gradually increases in the direction away from the annular gap throat. A jet component is arranged in the annular gap throat, and the jet component is connected to the liquid injection port for atomizing the liquid.

[0014] Preferably, the jet component is provided with radial spray holes, and the radial spray holes are arranged perpendicular to the axis of the tubular atomization mixing and mass transfer section.

[0015] Preferably, a gas guide cone is provided at the windward end of the jet component, and the windward surface of the gas guide cone is an ellipsoidal convex surface.

[0016] Preferably, a stationary swirling element is provided in the swirling separation tube, and swirling blades are provided on the outer periphery of the stationary swirling element. The swirling blades are spirally curved, and the outer edges of the swirling blades are fixedly connected to the inner wall of the swirling separation tube.

[0017] Preferably, the windward end of the main body of the stationary rotating element is provided with an elliptical guide cone, and the leeward end of the main body of the stationary rotating element is provided with a conical guide cone.

[0018] Preferably, an anti-rotation blade is provided on the outer wall of the outlet section of the cyclone separation tube, and the anti-rotation blade is located below the drainage annular gap to prevent the formation of a cyclone field inside the outer tube.

[0019] Preferably, an inner annular drainage port is provided at the upper end of the cyclone separation tube, the inner annular drainage port is trumpet-shaped, and its inner diameter gradually increases in the direction toward the exhaust pipe;

[0020] An outer annular gas collecting port is arranged at one end of the exhaust pipe facing the cyclone separation pipe, the outer edge of the outer annular gas collecting port is a rounded structure, and the drainage annular gap is located between the outer annular gas collecting port and the inner annular drainage port.

[0021] Preferably, the cyclone separation tube, the exhaust pipe and the outer tube are coaxially arranged.

[0022] The compact vertical pipe layout natural gas absorption and deacidification purification device provided by the present invention has the following beneficial effects compared with the prior art: the present invention combines tubular atomization mixing contact mass transfer with tubular gas-liquid separation, and innovatively proposes a vertical pipe layout natural gas deacidification purification treatment device. The tubular atomization mixing contact mass transfer section ensures the rapid atomization and mixing of the absorption liquid, so that it has the advantages of compact structure, small amount of absorbent, high gas-liquid interface mass transfer coefficient and good gas-liquid mixing contact uniformity. The tubular gas-liquid cyclone separation adopts a built-in cyclone separation tube in the pipeline to ensure the compactness and reliability of the gas-liquid separation components. At the same time, the tubular atomization mixing contact mass transfer tube and the tubular gas-liquid separation tube are arranged vertically in parallel and in a U-shaped structure, which reduces the overall height of the equipment. Especially in the multi-stage series process of the device, it can be flexibly arranged and distributed horizontally and vertically, which increases the compactness and flexibility of the equipment installation layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic cross-sectional structure diagram of a natural gas absorption and deacidification purification device with a compact riser layout provided for an implementation example of the present invention;

[0025] Figure 2 A schematic diagram of a partial cross-sectional structure of a tubular atomizing mixing mass transfer tube provided for an implementation example of the present invention;

[0026] Figure 3 A schematic diagram of a partial cross-sectional structure of a tubular gas-liquid separation tube provided for an implementation example of the present invention;

[0027] Figure 4 A schematic diagram of a horizontal series installation arrangement provided for an implementation example of the present invention;

[0028] Figure 5 A schematic diagram of a longitudinal series installation arrangement provided for an implementation case of the present invention;

[0029] In the figure, 1, acid gas inlet; 2, liquid injection port; 3, tubular atomizing element; 4, contact mixing mass transfer tube; 5, gas-liquid outlet; 6, primary liquid discharge port; 7, secondary liquid discharge port; 8, inlet elbow; 9, cyclone separation tube; 10, outer tube; 11, stationary swirl element; 12, anti-swirl blade; 13, liquid discharge annular gap; 14, exhaust pipe; 15, purified gas outlet; 16, gas steady flow straight pipe section; 17, gas contraction acceleration section; 18, jet component; 181, radial spray hole; 19, annular gap throat; 20, gas dispersion expansion section; 21, outer annular gas collection port; 22, inner annular drainage port. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] The embodiment of the present invention provides a compact riser layout natural gas absorption deacidification purification device, which has the characteristics of high gas-liquid mass transfer efficiency, compact structure, large processing capacity, simple operation, etc., and is particularly suitable for replacing traditional absorption towers in natural gas deacidification processes in offshore platforms and remote areas on land.

[0033] Combine the following Figure 1-Figure 5 The technical solution provided by the present invention is described in more detail.

[0034] like Figure 1-Figure 3As shown, the compact riser layout natural gas absorption and deacidification purification device provided by the present invention comprises a tubular atomization mixing mass transfer section and a tubular gas-liquid separation section, wherein: the top and bottom ends of the tubular atomization mixing mass transfer section are respectively provided with an acid gas inlet 1 and a primary liquid discharge port 6, and the tubular atomization mixing mass transfer section is connected to a liquid flow channel having a liquid injection port 2; the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section are arranged in parallel, and the overall structure is U-shaped, as shown in FIG. Figure 1 As shown, the tubular atomization mixing mass transfer section includes a tubular atomization element 3, which is used to mix and atomize the gas phase and the liquid phase. The tubular gas-liquid separation section includes an outer tube 10 and a cyclone separation tube 9 located in the outer tube 10. The inlet of the cyclone separation tube 9 is connected to the gas-liquid outlet 5 on the side wall of the pipeline of the tubular atomization mixing mass transfer section, which is used to generate a cyclone centrifugal force; there is an annular space between the cyclone separation tube 9 and the outer tube 10, and an exhaust pipe 14 is provided at the top end of the outer tube 10. There is a drainage annular gap 13 between the exhaust pipe 14 and the top end of the cyclone separation tube 9, and the drainage annular gap 13 is connected to the annular space. The bottom end of the outer tube 10 is provided with a secondary drainage port 7.

[0035] The tubular atomizing mixing mass transfer section atomizes the absorbent into micro-droplets, which enter the contact mixing mass transfer section with the airflow for intense gas-liquid mixing and mass transfer absorption; some of the droplets after mass transfer contact the wall of the mixing mass transfer tube 4 to form a liquid film and fall to the bottom of the pipe to wait for discharge, and some of the droplets fall with the airflow to the free liquid surface of the rich liquid sedimentation chamber at the bottom of the contact mixing mass transfer tube 4 to be captured and separated, and deposited in the rich liquid sedimentation chamber to wait for discharge. The droplets entrained in the high-speed airflow enter the tubular gas-liquid separation section from the gas-liquid outlet 5, and the gas and liquid generate cyclonic centrifugal force in the cyclone separation tube 9, and the droplets are thrown to the wall to form a liquid film, which is discharged along the drainage annular gap 13 to the annular space between the outer tube 10 and the cyclone separation tube 9, and gravity sedimentation separation is carried out in this space, and the rich liquid settles to the bottom rich liquid sedimentation chamber to wait for discharge through the secondary drainage port 7.

[0036] As an alternative embodiment, see Figure 2 The tubular atomization mixing mass transfer section includes a gas steady flow straight pipe section 16, a gas contraction acceleration section 17, an annular gap throat 19, a gas-liquid dispersion expansion section, and a contact mixing mass transfer tube 4 which are sequentially connected along the gas flow direction, wherein: the inner diameter of the gas contraction acceleration section 17 gradually decreases in the direction away from the gas steady flow straight pipe section 16, and the gas flow is accelerated in this section; the inner diameter of the gas-liquid dispersion expansion section gradually increases in the direction away from the annular gap throat 19, and the gas is decelerated in this section; the tubular atomization element 3 includes a jet component 18, the jet component 18 is located in the annular gap throat 19, and the jet component 18 is connected to the liquid injection port 2 for spraying a liquid column.

[0037] Specifically, the inner diameter of the contact mixing mass transfer tube 4 is 20mm-300mm, and the length is 12-16 times the tube diameter, which is determined according to the gas-liquid absorption mass transfer time scale; the contraction angle α of the gas contraction acceleration section 17 ranges from 10° to 30°; the expansion angle β of the gas dispersion expansion section 20 is 5° to 20°; the gas-liquid outlet 5 is located 10-16 times the tube diameter below the contact mixing mass transfer tube 4 section.

[0038] After the airflow is accelerated, the liquid column sprayed from the jet component 18 collides with and mixes with the gas phase at the annular gap throat 19, and then diffuses out from the gas-liquid dispersion expansion section and enters the contact mixing mass transfer tube 4 for further thorough mixing.

[0039] As an alternative embodiment, see Figure 2 As shown, the jet component 18 is provided with radial spray holes 181, and the radial spray holes 181 are arranged perpendicular to the axis of the tubular atomizing mixing and mass transfer section.

[0040] The radial spray hole 181 is perpendicular to the axis of the tubular atomizing mixing and mass transfer section, that is, perpendicular to the direction of the airflow, so as to facilitate the full mixing and atomization of the liquid phase and the airflow.

[0041] As an optional implementation, a gas guide cone is provided at the windward end of the jet component 18, and the windward surface of the gas guide cone is an ellipsoidal convex surface for guiding the gas flow to shear and break the liquid column.

[0042] The liquid column is sheared and broken by the airflow guided by the ellipsoidal gas guide cone on the windward side of the central cylindrical jet component 18, and broken into uniform micro-droplets. The broken and atomized micro-droplets are decelerated by the gas dispersion expansion section 20 and transported to the contact mixing mass transfer pipe 4, which facilitates sufficient atomization and mixing of gas and liquid.

[0043] As an alternative embodiment, see Figure 1 As shown, a stationary swirling element 11 is provided in the cyclone separation tube 9, and a swirling blade 12 is provided on the outer periphery of the stationary swirling element 11. The swirling blade 12 is spirally curved, and the outer edge of the swirling blade 12 is fixedly connected to the inner wall of the cyclone separation tube 9. The gas-liquid mixed phase passes through the stationary swirling element 11, and under the action of the swirling centrifugal force generated by the swirling blade 12, the liquid droplets entrained in the air flow are thrown to the wall to form a liquid film, and the liquid film reaches the drainage annular gap 13 along the inner wall of the cyclone separation tube 9.

[0044] As an alternative embodiment, see Figure 1 As shown, the main windward end of the static swirling element 11 is provided with an elliptical guide cone, and the main leeward end of the static swirling element 11 is provided with a conical guide cone. Similarly, the elliptical guide cone can guide the gas-liquid mixed fluid to collide with the curved blade surface, further improving the separation effect of the two. The conical guide cone facilitates the separated clean gas to converge to the center of the pipeline.

[0045] As an alternative embodiment, see Figure 1 As shown, a rotation-stopping blade is provided on the outer wall of the outlet section of the cyclone separation tube 9 . The rotation-stopping blade is located below the drainage annular gap 13 and is used to prevent a cyclone field from being formed inside the outer tube 10 .

[0046] The anti-rotation blades arranged on the outer wall of the cyclone separation tube 9 can prevent the airflow from generating a swirl in the outer tube 10, thereby affecting the gravity sedimentation of the separated rich liquid.

[0047] Specifically, the inlet elbow 8 connects the gas-liquid outlet 5 and the cyclone separation tube 9, and the two parts can be connected by a flange. The inner diameters of the inlet elbow 8 and the cyclone separation tube 9 are 15mm-200mm; the inner diameter of the outer tube 10 is 20mm-300mm, and the length is 12-16 times the tube diameter; the angle between the curved blades of the stationary rotating element 11 and the axis of the cyclone separation tube 9 is in the range of 30°-60°, and the length of the anti-rotation blade is 2-3 times the inner diameter of the cyclone separation tube 9, and the anti-rotation blade is arranged at a distance of 40mm-80mm below the drainage annular gap 13 to prevent the formation of a cyclone field inside the outer tube 10.

[0048] As an alternative embodiment, see Figure 3 As shown, an inner annular drainage port 22 is provided at the upper end of the cyclone separation tube 9. The inner annular drainage port 22 is trumpet-shaped, and its inner diameter gradually increases in the direction toward the exhaust pipe 14; an outer annular gas collecting port 21 is provided at one end of the exhaust pipe 14 facing the cyclone separation tube 9, and the outer edge of the outer annular gas collecting port 21 is a chamfered structure, and the drainage annular gap 13 is located between the outer annular gas collecting port 21 and the inner annular drainage port 22.

[0049] The inner edge of the inner annular drainage port 22 and the outer edge of the outer annular gas collecting port 21 are both rounded to a certain size, with the edge rounding range R being 2mm-5mm, thereby guiding the separated rich liquid into the outer tube 10 and the dry gas into the exhaust pipe 14 for timely separation and removal.

[0050] As an optional implementation, the cyclone separation tube 9 , the exhaust pipe 14 and the outer tube 10 are coaxially arranged.

[0051] As an alternative embodiment, see Figure 1 As shown, the top of the exhaust pipe 14 is provided with a purified gas outlet 15, and the axis of the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section are vertically arranged in a U shape, see Figure 4 and Figure 5 As shown, the number of tubular atomization mixing mass transfer sections and tubular gas-liquid separation sections is one group or more than two groups. When the number of tubular atomization mixing mass transfer sections and tubular gas-liquid separation sections is more than two groups, each group of structures is arranged in series horizontally or vertically, and the purified gas outlet 15 of the upper-level tubular gas-liquid separation section is connected to the acid gas inlet 1 of the lower-level tubular atomization mixing mass transfer section.

[0052] See also Figure 4 and Figure 5 As shown, the tubular atomizing mixing contact mass transfer tube and the tubular gas-liquid separation tube are arranged vertically in a U shape, which reduces the overall height of the equipment. Especially in the multi-stage series process of the device, they can be flexibly arranged and distributed horizontally and vertically, which increases the compactness and flexibility of the equipment installation layout.

[0053] During operation, natural gas containing acidic gas enters the U-shaped vertically arranged compact riser layout natural gas absorption and deacidification purification device from the acid gas inlet 1, and is contracted and accelerated in the gas contraction acceleration section 17 of the tubular atomizing element 3, and a high-speed airflow is formed in the annular throat 19. The absorbent is injected into the tubular atomizing element 3 from the liquid injection port 2, and a liquid column is sprayed around the annular throat 19 where the high-speed airflow is formed by the central cylindrical jet component 18. The liquid column is sheared and broken by the airflow guided by the ellipsoidal gas guide cone on the windward side of the central cylindrical jet component 18, and is broken into uniform micro-droplets. The broken and atomized micro-droplets are decelerated by the gas dispersion expansion section 20 and transported to the contact mixing mass transfer pipe 4, where intense gas-liquid mixing and mass transfer absorption are carried out to achieve efficient removal of acid gas. After the mass transfer reaction, part of the droplets form a liquid film on the wall of the contact mixing mass transfer tube 4, and fall along the tube wall to the bottom of the contact mixing mass transfer tube 4 to wait for removal, while part of the droplets fall with the airflow to the free liquid surface of the rich liquid sedimentation chamber at the bottom of the contact mixing mass transfer tube 4, are captured and separated, and discharged from the primary discharge port 6. The droplets entrained in the high-speed airflow enter the tubular gas-liquid separation section from the gas-liquid outlet 5, and a small part of the droplets entrained by the airflow directly hits the inlet elbow 8 to form a liquid film. The liquid film formed here returns to the bottom of the contact mixing mass transfer tube 4 along the original path, and most of it reaches the cyclone separation tube 9 with the airflow. The cyclone centrifugal force generated by the static cyclone element 11 throws the droplets entrained in the airflow to the wall to form a liquid film. The liquid film reaches the drainage annular gap 13 along the inner wall of the cyclone separation tube 9, and is separated by the cyclone through the inner annular drainage port 19. The liquid film on the inner wall of the tube 9 is drained and separated, and the separated liquid film enters the space between the outer tube 10 and the cyclone separation tube 9 for gravity sedimentation. The rich liquid settled by gravity enters the rich liquid deposition chamber at the bottom of the outer tube 10 and is discharged from the secondary liquid discharge port 7. At the same time, the outer wall of the cyclone separation tube 9 is provided with anti-rotation blades 12 evenly distributed along the circumferential direction to prevent the airflow from generating vortex in the outer tube 10, which affects the gravity sedimentation of the separated rich liquid; and the separated dry gas is transported to the purified gas outlet 15 by the exhaust pipe 14 for discharge, thereby realizing absorption decarbonization purification treatment.

[0054] If the U-shaped vertically arranged single-stage tubular natural gas deacidification purification absorption device cannot meet the treatment index, two or more stages of tubular natural gas deacidification purification absorption devices can be connected in series, and the horizontal and vertical arrangements can be flexibly selected according to the on-site installation space conditions, such as Figure 4 and Figure 5 As shown, the overall height of the equipment is reduced and the compactness and flexibility of the installation arrangement are increased.

[0055] The compact standpipe layout natural gas absorption deacidification purification device and method provided by the present invention has the following characteristics compared with conventional natural gas deacidification equipment:

[0056] 1. The compact vertical tube natural gas absorption and deacidification purification device described in the present invention innovatively combines the micro-droplet atomization mixing mass transfer in the tube with the gas-liquid cyclone separation in the tube into an integrated device. The droplets atomized in the tube not only improve the uniformity of gas-liquid mixing mass transfer, but also greatly improve the mass transfer efficiency, thereby reducing the amount of absorbent used and achieving the effect of reducing costs and increasing efficiency; at the same time, the gas-liquid cyclone rapid separation method in the tube is adopted, which greatly reduces the entrainment of liquid in the purified gas, achieves one-time high-efficiency removal of acid gas, and saves production costs.

[0057] 2. The compact vertical pipe natural gas absorption and deacidification purification device described in the present invention has a U-shaped vertical arrangement of the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section, which significantly reduces the overall height of the equipment. It can be conveniently and flexibly connected in multiple stages horizontally or vertically in series, which can ensure the deacidification and purification effect of the natural gas absorption and purification treatment on the one hand; on the other hand, it can be more flexibly arranged horizontally or vertically according to the on-site installation conditions, significantly increasing the compactness of the structure and the flexibility of installation and arrangement.

[0058] In the description of this specification, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A compact riser layout natural gas absorption and deacidification purification device, characterized in that: It includes a tubular atomization mixing mass transfer section and a tubular gas-liquid separation section, wherein: The top and bottom ends of the tubular atomizing mixing and mass transfer section are respectively provided with an acid gas inlet and a primary liquid discharge port, and the tubular atomizing mixing and mass transfer section is connected to a liquid flow channel having a liquid injection port; The tubular atomization mixing mass transfer section and the tubular gas-liquid separation section are arranged in parallel and have a U-shaped structure. The tubular gas-liquid separation section includes an outer tube and a cyclone separation tube located inside the outer tube. The inlet of the cyclone separation tube is connected to the gas-liquid outlet on the side wall of the tube of the tubular atomization mixing mass transfer section to generate a cyclone centrifugal force. There is an annular space between the cyclone separation tube and the outer tube, an exhaust pipe is provided at the top of the outer tube, a drainage annular gap exists between the exhaust pipe and the top of the cyclone separation tube, the drainage annular gap is connected to the annular space, and a secondary drainage port is provided at the bottom of the outer tube; A stationary swirling element is arranged in the swirling separation tube, and a swirling blade is arranged on the outer periphery of the stationary swirling element. The swirling blade is spirally curved, and the outer edge of the swirling blade is fixedly connected to the inner wall of the swirling separation tube; The outer wall of the outlet section of the cyclone separation tube is provided with a rotation-stopping blade, and the rotation-stopping blade is located below the drainage annular gap and is used to prevent a cyclone field from being formed inside the outer tube.

2. The compact standpipe layout natural gas absorption and deacidification purification device according to claim 1 is characterized in that: The top of the exhaust pipe is provided with a purified gas outlet, the axes of the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section are arranged in parallel, and the number of the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section is one group or more than two groups; When the number of the tubular atomization mixing mass transfer section and the tubular gas-liquid separation section is more than two groups, each group of structures is arranged in series horizontally or vertically, and the purified gas outlet of the tubular gas-liquid separation section of the upper level is connected to the acid gas inlet of the tubular atomization mixing mass transfer section of the lower level.

3. The compact standpipe layout natural gas absorption and deacidification purification device according to claim 1 is characterized in that: The tubular atomization mixing mass transfer section includes a gas steady flow straight pipe section, a gas contraction acceleration section, an annular gap throat, a gas-liquid dispersion expansion section, and a contact mixing mass transfer pipe which are sequentially connected along the gas flow direction, wherein: The inner diameter of the gas contraction acceleration section gradually decreases in the direction away from the gas steady flow straight pipe section, and the inner diameter of the gas-liquid dispersion expansion section gradually increases in the direction away from the annular gap throat. A jet component is arranged in the annular gap throat, and the jet component is connected to the liquid injection port for atomizing the liquid.

4. The compact standpipe layout natural gas absorption and deacidification purification device according to claim 3 is characterized in that: The jet component is provided with radial spray holes, and the radial spray holes are arranged perpendicularly to the axis of the tubular atomizing mixing and mass transfer section.

5. The compact standpipe layout natural gas absorption and deacidification purification device according to claim 3 is characterized in that: A gas guide cone is arranged at the windward end of the jet component, and the windward surface of the gas guide cone is an ellipsoidal convex surface.

6. The compact standpipe layout natural gas absorption and deacidification purification device according to claim 1, characterized in that: The windward end of the main body of the stationary rotating element is provided with an elliptical flow guide cone, and the leeward end of the main body of the stationary rotating element is provided with a conical flow guide cone.

7. The compact standpipe layout natural gas absorption and deacidification purification device according to claim 1, characterized in that: An inner annular drainage port is provided at the upper end of the cyclone separation tube, the inner annular drainage port is trumpet-shaped, and its inner diameter gradually increases in the direction toward the exhaust pipe; An outer annular gas collecting port is arranged at one end of the exhaust pipe facing the cyclone separation pipe, the outer edge of the outer annular gas collecting port is a rounded structure, and the drainage annular gap is located between the outer annular gas collecting port and the inner annular drainage port.

8. The compact standpipe layout natural gas absorption and deacidification purification device according to claim 1, characterized in that: The cyclone separation tube, the exhaust pipe and the outer tube are coaxially arranged.

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