A natural gas decarbonization device

Abstract

The present invention discloses a natural gas decarbonization device, which relates to the technical field of natural gas purification. The natural gas decarbonization device comprises a processing tank, an air inlet pipe is arranged on the outside of the processing tank, and a carbon dioxide absorption pipe is rotatably installed in the processing tank; a rotor is fixed to the outside of the carbon dioxide absorption pipe, and the rotor is rotatably connected to the inner wall of the processing tank, a decarbonization cavity is radially arranged on the rotor, a semipermeable membrane assembly is detachably fixed in the decarbonization cavity, and there is a pressure difference on both sides of the semipermeable membrane assembly to accelerate the decarbonization of the natural gas in the decarbonization cavity. The natural gas decarbonization device drives the rotor to rotate, so that each decarbonization cavity is intermittently injected with natural gas. When the rotor rotates one circle, the natural gas is decarbonized and discharged, thereby avoiding the situation where the newly input natural gas is mixed with the decarbonized natural gas and the decarbonized natural gas causes the decarbonization effect of the natural gas to decrease.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas purification, in particular to a natural gas decarbonization device. Background Art

[0002] The natural gas extracted from oil and gas fields is mainly composed of hydrocarbons and various impurity gases, the main component of which is methane, in addition to acidic gases such as carbon dioxide. The natural gas quality standard requires that the carbon dioxide content cannot be greater than 3%, and carbon dioxide is very corrosive to steel after being dissolved in the solution. If the pH value is the same, the acidity ratio of carbon dioxide is also relatively high, so the degree of corrosion to steel is also relatively high, and it will also cause serious pollution to the environment.

[0003] At present, the most common natural gas decarbonization process on the market is the absorption liquid method, which is to absorb the gas containing carbon dioxide into the liquid, and then separate the carbon dioxide by distillation. Common absorption liquids include amines, alcohols and inorganic salts. However, although the absorption liquid method is mature and reliable, it has problems such as high energy consumption, low removal rate and easy environmental pollution, and it is difficult to obtain high-purity hydrogen sulfide and carbon dioxide gas. With the introduction of the concept of energy conservation and emission reduction, the country also strictly requires efficient decarbonization of the mined natural gas. Membrane decarbonization is gradually coming to the market. It uses a semi-permeable membrane to separate the gas containing carbon dioxide into two parts: pure carbon dioxide gas and tail gas. Common membranes are polyester membranes, polycarbonate membranes and polyamide membranes. In the membrane separation process, carbon dioxide molecules will preferentially pass through the membrane pores, while nitrogen, oxygen, methane and other molecules are retained on the membrane surface, and finally pure carbon dioxide gas is obtained.

[0004] At present, some decarbonization devices use ultra-gravity desulfurization and decarbonization to remove acidic gases such as hydrogen sulfide and carbon dioxide carried in natural gas through hydrate reaction units and ultra-gravity membrane absorption units respectively. Most of the acidic gases such as hydrogen sulfide and carbon dioxide are stored in the form of solid hydrates, and a small part of the acidic gas is further removed through the ultra-gravity membrane absorption unit, ensuring the removal rate of the acidic gas.

[0005] However, there are still some defects in actual use. Although the semipermeable membrane can filter acidic gases such as hydrogen sulfide and carbon dioxide, on the side of the semipermeable membrane close to the natural gas input, due to the continuous input of raw gas, acidic gases such as hydrogen sulfide and carbon dioxide will also continue to be input along with the natural gas, resulting in incomplete decarbonization and desulfurization, and further causing the acidic gases to be discharged together with the decarbonized natural gas, affecting the decarbonization and desulfurization effect of the natural gas. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a natural gas decarbonization device, which solves the problems raised in the background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a natural gas decarbonization device, including a processing tank, an air inlet pipe is provided on the outside of the processing tank, and also includes a carbon dioxide absorption pipe, the carbon dioxide absorption pipe is rotatably installed in the processing tank; a rotor, the rotor is fixed to the outside of the carbon dioxide absorption pipe, and the rotor is rotatably connected to the inner wall of the processing tank, the rotor is radially provided with a decarbonization cavity, a semipermeable membrane assembly is detachably fixed in the decarbonization cavity, and there is a pressure difference on both sides of the semipermeable membrane assembly to accelerate the decarbonization of natural gas in the decarbonization cavity; a connecting air pipe, the connecting air pipe is provided at one end of the decarbonization cavity away from the carbon dioxide absorption pipe, and the connecting air pipe is connected to the air outlet end of the air inlet pipe during one rotation of the connecting air pipe for inputting natural gas into the decarbonization cavity; natural gas An exhaust hole, wherein the natural gas exhaust hole is arranged at the bottom of the decarbonization chamber, and the natural gas exhaust hole is located on the side of the semipermeable membrane assembly away from the carbon dioxide absorption tube; a receiving plate, wherein the receiving plate is fixed in the processing tank, and a connecting ring in contact with the lower surface of the rotor is fixed on the upper surface of the receiving plate, and an arc groove is opened on the connecting ring, and the natural gas exhaust hole docks with the arc groove during one rotation process, so as to be used for the output of the natural gas after decarbonization; wherein, a high-speed flowing carbon dioxide absorption liquid is arranged inside the carbon dioxide absorption tube, and a first connecting capillary connected to the decarbonization chamber one by one is radially installed on the circumference of the carbon dioxide absorption tube, and the connecting part of the first connecting capillary and the decarbonization chamber is located on the side of the semipermeable membrane assembly close to the carbon dioxide absorption tube, so as to be used for the output of carbon dioxide in the decarbonization chamber.

[0008] Furthermore, the carbon dioxide absorption tube is a Venturi tube, and the first connecting capillary is arranged at the throat of the carbon dioxide absorption tube. The air pressure at the throat of the carbon dioxide absorption tube is the lowest, which produces an adsorption effect to accelerate the output of carbon dioxide inside the decarbonization chamber.

[0009] Furthermore, an annular groove is provided on the side wall of the rotor, and an arc-shaped back plate is fixed inside the processing tank, and the arc-shaped back plate is slidably connected to the annular groove; a piston plate adapted to the connecting air pipe is slidably installed inside the decarbonization chamber, and a spring for driving the piston plate to slide inside the decarbonization chamber is installed on the outside of the connecting air pipe; a connecting slide is fixed on the side of the piston plate close to the inner wall of the processing tank, and after the connecting slide rotates to the arc-shaped back plate with the rotor, the arc-shaped back plate squeezes the connecting slide to move toward the direction of the carbon dioxide absorption tube, so that the air pressure inside the decarbonization chamber on the side of the semipermeable membrane assembly away from the carbon dioxide absorption tube rises.

[0010] Furthermore, the arc corresponding to the arc-shaped support plate is 90°-270°, and the radial diameter of the arc-shaped support plate gradually increases along the rotation direction of the rotor; the arc-shaped groove is within the arc angle range corresponding to the arc-shaped support plate, and the intake pipe is outside the arc angle range corresponding to the arc-shaped support plate.

[0011] Furthermore, a second sealing ring is provided at the bottom of the rotor and located outside the connecting ring, and a connecting groove adapted to the second sealing ring is provided on the upper surface of the receiving plate.

[0012] Furthermore, a suction pump is fixed at the bottom of the receiving plate, the suction end of the suction pump is connected to the arc groove, and the exhaust end of the suction pump is installed with a second venturi tube, and the output end of the second venturi tube is provided with an exhaust pipe that passes through the outer wall of the treatment tank; a second connecting capillary is installed at the throat position of the second venturi tube, and the other end of the second connecting capillary passes through the receiving plate and is arranged between the connecting slide groove and the connecting ring.

[0013] Furthermore, a motor is fixed to the lower surface of the receiving plate, a rotating shaft rotatably connected to the inner wall of the treatment tank is fixed to the output end of the motor, and a worm is installed on the rotating shaft; the carbon dioxide absorption tube is rotatably connected to the receiving plate, and the lower end of the carbon dioxide absorption tube passes through the receiving plate and is installed with a worm wheel, and the worm wheel is meshed with the worm.

[0014] Furthermore, the semipermeable membrane assembly comprises a mounting plate symmetrically mounted on the inner wall of the decarbonization chamber, at least two grid support plates are fixed between the two mounting plates, and the semipermeable membrane is mounted inside the gap of the grid support plates.

[0015] Furthermore, first sealing rings are fixed on both upper and lower ends of the outer side of the rotor, and an interlocking groove slidably connected to the first sealing ring is provided on the inner wall of the processing tank; a one-way valve is installed on the connecting air pipe, and a nozzle is installed on the end of the connecting air pipe facing the carbon dioxide absorption tube; a cover plate is fixed on the upper surface of the rotor, and a sealing gasket adapted to the decarbonization chamber is provided on the lower surface of the cover plate, and the upper end of the carbon dioxide absorption tube passes through the cover plate and is rotatably connected to a liquid injection tube through a bearing.

[0016] Furthermore, the processing tank is provided with a waste liquid chamber in the space below the receiving tray, a discharge pipe is provided at the lower end of the outer side of the waste liquid chamber, and an overflow hole is provided at the outer side of the waste liquid chamber near the receiving tray.

[0017] The present invention has the following beneficial effects:

[0018] (1) The natural gas decarbonization device drives the rotor to rotate so that each decarbonization chamber intermittently injects natural gas. When the rotor rotates one circle, the natural gas is decarbonized and discharged, thereby avoiding the situation where the newly input natural gas mixes with the decarbonized natural gas and causes a decrease in the natural gas decarbonization effect.

[0019] (2) The natural gas decarbonization device reduces the throat pressure through the characteristics of the Venturi tube structure inside the injection pipe, thereby causing the first connecting capillary to suck the carbon dioxide gas filtered inside the decarbonization chamber, and causing the air pressure inside the decarbonization chamber on the side of the semipermeable membrane assembly facing the injection pipe to drop, further causing an air pressure difference on both sides of the semipermeable membrane assembly to accelerate the efficiency of natural gas decarbonization.

[0020] (3) The natural gas decarbonization device, through the setting of the arc-shaped abutment plate, causes the connecting slide plate on the rotor to slide, and further causes the piston plate to slide toward the semipermeable membrane assembly, thereby squeezing the natural gas, causing the gas pressure inside the decarbonization chamber located on the side of the semipermeable membrane assembly away from the injection pipe to rise, and further causing a gas pressure difference on both sides of the semipermeable membrane assembly to accelerate the efficiency of natural gas decarbonization.

[0021] (4) In the natural gas decarbonization device, during the rotation of the rotor, the natural gas exhaust hole at the bottom of the decarbonization chamber will contact the connecting ring. When the exhaust hole meets the arc groove on the connecting ring, the natural gas inside the decarbonization chamber enters the suction pump through the exhaust hole and the arc groove, thereby evacuating the natural gas inside the decarbonization chamber to facilitate the subsequent re-input of natural gas containing acidic gas. In addition, through the provision of the second venturi tube, the second connecting capillary can be used to suck the natural gas leaked between the rotor and the receiving plate, thereby improving the practicality of the equipment.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the installation structure of the rotor in the present invention;

[0025] Figure 3 For the present invention Figure 2 Another perspective of the picture;

[0026] Figure 4 It is a schematic diagram of the internal structure of the processing tank in the present invention;

[0027] Figure 5 An exploded view of the internal parts of the treatment tank in the present invention;

[0028] Figure 6 Schematic diagram of the internal structure of the rotor in the present invention;

[0029] Figure 7 For the present invention Figure 6 The main view;

[0030] Figure 8 It is a schematic diagram of the structure of the semipermeable membrane assembly in the present invention;

[0031] Fig. 9 It is a schematic diagram of the installation structure of the piston plate in the present invention;

[0032] Fig.10 It is a schematic diagram of the installation structure of the arc-shaped abutment plate in the present invention;

[0033] Fig.11 It is a schematic diagram of the connection structure between the arc-shaped abutment plate and the annular groove in the present invention;

[0034] Fig.12 For the present invention Fig.11 A top view of

[0035] Fig.13 It is a schematic diagram of the connection between the arc-shaped abutment plate and the connecting slide plate in the present invention.

[0036] In the figure, 1, treatment tank; 2, discharge pipe; 3, air inlet pipe; 4, overflow hole; 5, exhaust pipe; 6, injection pipe; 7, cover plate; 8, rotor; 9, first sealing ring; 10, decarbonization chamber; 11, control panel; 12, natural gas exhaust hole; 13, connecting air pipe; 14, one-way valve; 15, nozzle; 16, receiving plate; 17, carbon dioxide absorption tube; 18, motor; 19, rotating shaft; 20, worm; 21, worm wheel; 22 , waste liquid chamber; 23, suction pump; 24, second connecting capillary; 25, second venturi tube; 26, first connecting capillary; 27, second sealing ring; 28, connecting slide groove; 29, connecting ring; 30, arc groove; 31, semipermeable membrane assembly; 3101, mounting plate; 3102, grid support plate; 3103, semipermeable membrane; 32, piston plate; 33, connecting slide plate; 34, spring; 35, annular groove; 36, arc-shaped abutment plate. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it is necessary to understand that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements 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.

[0039] See also Figure 1 - Fig.13An embodiment of the present invention provides a technical solution: a natural gas decarbonization device, including a processing tank 1, an air intake pipe 3 is provided on the outside of the processing tank 1, and also includes a carbon dioxide absorption pipe 17, and the carbon dioxide absorption pipe 17 is rotatably installed in the processing tank 1. It should be noted that the natural gas input by the air intake pipe 3 is natural gas that has undergone preliminary desulfurization and decarbonization treatment to reduce the burden of the subsequent semipermeable membrane component 31.

[0040] In addition, the natural gas decarbonization device provided in this embodiment also includes a rotor 8, which is fixed to the outside of the carbon dioxide absorption tube 17. The rotor 8 and the carbon dioxide absorption tube 17 are in a concentric circle, so that the carbon dioxide absorption tube 17 drives the rotor 8 to rotate, and the rotor 8 is rotatably connected to the inner wall of the processing tank 1, and the connection needs to be sealed to avoid natural gas leakage. A decarbonization chamber 10 is radially provided on the rotor 8, and a semipermeable membrane assembly 31 is detachably fixed in the decarbonization chamber 10. The semipermeable membrane assembly 31 is used to remove the acidic gas in the natural gas, and there is a pressure difference on both sides of the semipermeable membrane assembly 31 to accelerate the decarbonization of the natural gas in the decarbonization chamber 10.

[0041] To facilitate the input of natural gas into the decarbonization chamber 10, the natural gas decarbonization device provided in this embodiment also includes a connecting gas pipe 13. The connecting gas pipe 13 is arranged at the end of the decarbonization chamber 10 away from the carbon dioxide absorption pipe 17. The connecting gas pipe 13 is connected to the gas outlet end of the air inlet pipe 3 during one rotation to be used for the input of natural gas into the decarbonization chamber 10. It should be noted that the inner diameter of the air inlet pipe 3 is larger than the inner diameter of the connecting gas pipe 13, so as to facilitate the natural gas to flow from the air inlet pipe 3 into the connecting gas pipe 13.

[0042] In order to facilitate the output of natural gas after decarbonization, the natural gas decarbonization device provided in this embodiment also includes a natural gas exhaust hole 12, which is arranged at the bottom of the decarbonization chamber 10, and the natural gas exhaust hole 12 is located on the side of the semipermeable membrane component 31 away from the carbon dioxide absorption tube 17. In addition, a receiving plate 16 is fixed in the processing tank 1, and a connecting ring 29 in contact with the lower surface of the rotor 8 is fixed on the upper surface of the receiving plate 16. It should be noted that the top surface of the natural gas exhaust hole 12 is projected on the plane where the connecting ring 29 is located to avoid leakage of natural gas from the natural gas exhaust hole 12. Of course, a flexible valve can also be set on the natural gas exhaust hole 12 to improve the decarbonization chamber. In order to improve the sealing effect of 10, and to facilitate the discharge of the decarbonized natural gas inside the decarbonization chamber 10 from the natural gas exhaust hole 12, an arc groove 30 is opened on the connecting ring 29, and the minimum inner diameter of the arc groove 30 is larger than the inner diameter of the natural gas exhaust hole 12, so that the exhaust time can be prolonged, which is conducive to the complete discharge of the decarbonized natural gas inside the decarbonization chamber 10. When the natural gas exhaust hole 12 is connected with the arc groove 30 during one rotation, the decarbonized natural gas inside the decarbonization chamber 10 flows out through the natural gas exhaust hole 12 and the arc groove 30. It should be noted that the angle between the arc groove 30 and the air inlet pipe 3 is preferably between 180°-345°, so as to fully use it for the decarbonization of the natural gas inside the decarbonization chamber 10.

[0043] Among them, a high-speed flowing carbon dioxide absorption liquid is provided inside the carbon dioxide absorption tube 17. The carbon dioxide absorption liquid is preferably a renewable chemical solvent, such as an amine solution, which can also be used for crude decarbonization of natural gas after absorbing the carbon dioxide inside the decarbonization chamber 10. In addition, a first connecting capillary 26 connected one-to-one with the decarbonization chamber 10 is radially installed on the side of the carbon dioxide absorption tube 17. The connecting part of the first connecting capillary 26 and the decarbonization chamber 10 is located on the side of the semipermeable membrane assembly 31 close to the carbon dioxide absorption tube 17, so as to be used for the carbon dioxide output in the decarbonization chamber 10.

[0044] like Figure 1 - Figure 7 As shown, the carbon dioxide absorption tube 17 provided in this embodiment is a venturi tube, and the first connecting capillary 26 is arranged at the throat of the carbon dioxide absorption tube 17. When the carbon dioxide absorption liquid flows at a high speed in the venturi tube, the air pressure at the throat of the venturi tube drops to the minimum, and then the throat of the venturi tube produces an adsorption effect on the surroundings, so that the first connecting capillary 26 sucks the carbon dioxide inside the decarbonization chamber 10, so that there is a positive pressure difference on both sides of the semipermeable membrane assembly 31, so as to accelerate the output of carbon dioxide inside the decarbonization chamber 10.

[0045] like Fig. 9 - Fig.13As shown, the side wall of the rotor 8 provided in this embodiment is provided with an annular groove 35, and an arc-shaped abutment plate 36 is fixed inside the processing tank 1, and the arc-shaped abutment plate 36 is slidably connected to the annular groove 35, and a piston plate 32 adapted to the connecting air pipe 13 is slidably installed inside the decarbonization chamber 10, and a spring 34 for driving the piston plate 32 to slide inside the decarbonization chamber 10 is installed on the outer side of the connecting air pipe 13, and a connecting slide plate 33 is fixed on the side of the piston plate 32 close to the inner wall of the processing tank 1, and after the connecting slide plate 33 rotates with the rotor 8 to the arc-shaped abutment plate 36, the arc-shaped abutment plate 36 squeezes the connecting slide plate 33 to move toward the direction of the carbon dioxide absorption tube 17, so that the air pressure inside the decarbonization chamber 10 on the side of the semipermeable membrane component 31 away from the carbon dioxide absorption tube 17 rises.

[0046] In the present embodiment, when the rotor 8 rotates, the annular groove 35 and the arc-shaped abutment plate 36 rotate relative to each other. When the connecting slide 33 rotates with the rotor 8 to the arc-shaped abutment plate 36, the connecting slide 33 is squeezed by the arc-shaped abutment plate 36, so that the connecting slide 33 moves toward the carbon dioxide absorption tube 17, and further moves the piston plate 32 toward the carbon dioxide absorption tube 17, so that the natural gas inside the decarbonization chamber 10 is squeezed, and the air pressure on the side of the semipermeable membrane assembly 31 inside the decarbonization chamber 10 away from the carbon dioxide absorption tube 17 is increased, so that a positive pressure difference is generated on both sides of the semipermeable membrane assembly 31, thereby accelerating the decarbonization of the natural gas. When the connecting slide 33 is separated from the arc-shaped abutment plate 36, the elastic potential energy of the spring 34 is released to reset the piston plate 32.

[0047] like Fig. 9 - Fig.12 As shown, the arc angle corresponding to the arc-shaped abutment plate 36 provided in this embodiment is 90°-270°. It should be noted that the arc angle corresponding to the arc-shaped abutment plate 36 needs to be smaller than the angle between the arc-shaped groove 30 and the intake pipe 3 to avoid the piston plate 32 still squeezing the internal space of the decarbonization chamber 10 during the natural gas intake process, and the radial diameter of the arc-shaped abutment plate 36 gradually increases along the rotation direction of the rotor 8, so that when the rotor 8 rotates, the piston plate 32 can slowly and uniformly move toward the carbon dioxide absorption tube 17, thereby gradually increasing the internal air pressure of the decarbonization chamber 10 to avoid the air pressure surge causing damage to the semipermeable membrane assembly 31.

[0048] In the present solution, it should be noted that the arc groove 30 is within the arc angle range corresponding to the arc abutment plate 36, and the air inlet pipe 3 is outside the arc angle range corresponding to the arc abutment plate 36, that is, when the decarbonized natural gas is discharged, the internal air pressure of the decarbonization chamber 10 is in a relatively increased state, and when the natural gas is input into the decarbonization chamber 10, the internal air pressure of the decarbonization chamber 10 is in a relatively stable state.

[0049] like Figure 2 - Figure 7As shown, the bottom of the rotor 8 provided in this embodiment is provided with a second sealing ring 27 outside the connecting ring 29, and the upper surface of the receiving plate 16 is provided with a connecting groove 28 adapted to the second sealing ring 27. The second sealing ring 27 makes the gap between the receiving plate 16 and the rotor 8 in a relatively sealed state, thereby reducing natural gas leakage.

[0050] like Figure 2 - Figure 7 As shown, in order to facilitate the further output of decarbonized natural gas, a suction pump 23 is fixed at the bottom of the receiving plate 16 provided in this embodiment, the suction end of the suction pump 23 is connected to the arc groove 30, and the exhaust end of the suction pump 23 is installed with a second venturi tube 25, and the output end of the second venturi tube 25 is provided with an exhaust pipe 5 that passes through the outer wall of the processing tank 1. The suction pump 23 sucks the decarbonized natural gas inside the arc groove 30, and further allows the decarbonized natural gas to flow out through the second venturi tube 25 and the exhaust pipe 5.

[0051] In order to avoid excessive natural gas being retained in the gap between the receiving plate 16 and the rotor 8, a second connecting capillary 24 is installed at the throat of the second venturi tube 25. The other end of the second connecting capillary 24 passes through the receiving plate 16 and is arranged between the connecting groove 28 and the connecting ring 29. The air flow velocity increases and the air pressure decreases at the throat of the second venturi tube 25, so that the throat of the second venturi tube 25 has a certain adsorption effect, and the second connecting capillary 24 further sucks the natural gas in the gap between the receiving plate 16 and the rotor 8. Of course, a small hole can be opened in the side wall of the connecting ring 29 to facilitate the flow of air on both sides of the connecting ring 29, thereby avoiding the retention of natural gas inside the connecting ring 29.

[0052] like Figure 3 - Figure 5 As shown, in order to conveniently drive the carbon dioxide absorption tube 17 to rotate, thereby driving the rotor 8 to rotate, a motor 18 is fixed to the lower surface of the receiving plate 16, and a rotating shaft 19 rotatably connected to the inner wall of the treatment tank 1 is fixed to the output end of the motor 18, and a worm 20 is installed on the rotating shaft 19. The carbon dioxide absorption tube 17 is rotatably connected to the receiving plate 16, and the lower end of the carbon dioxide absorption tube 17 passes through the receiving plate 16 and is installed with a worm gear 21, which meshes with the worm gear 20.

[0053] In this solution, the motor 18 drives the shaft 19 to rotate, which further rotates the worm 20. The worm 20 meshes with the worm wheel 21, so that the worm wheel 21 drives the carbon dioxide absorption tube 17 to rotate, which further rotates the rotor 8.

[0054] like Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the semipermeable membrane assembly 31 provided in this embodiment includes a mounting plate 3101 symmetrically mounted on the inner wall of the decarbonization chamber 10. Preferably, the mounting plate 3101 and the inner wall of the decarbonization chamber 10 are detachably connected, such as snap-on, sliding connection, etc. At least two grid support plates 3102 are fixed between the two mounting plates 3101, and a semipermeable membrane 3103 is installed inside the gap of the grid support plates 3102. The semipermeable membrane 3103 is supported by the grid support plates 3102 to prevent the air pressure change inside the decarbonization chamber 10 from affecting the semipermeable membrane 3103 and causing damage to the semipermeable membrane 3103.

[0055] like Figure 1 - Figure 7 As shown, in order to avoid air leakage between the rotor 8 and the processing tank 1, a first sealing ring 9 is fixed to the upper and lower ends of the outer side of the rotor 8, and the inner wall of the processing tank 1 is provided with an interlocking groove slidably connected to the first sealing ring 9. The sliding connection between the first sealing ring 9 and the interlocking groove improves the sealing effect between the rotor 8 and the processing tank 1 and reduces natural gas leakage. In addition, a control panel 11 is also installed on the outer side of the processing tank 1, and the control panel 11 is electrically connected to the suction pump 23 and the motor 18 respectively to control the operation of the suction pump 23 and the motor 18.

[0056] In order to facilitate the input of natural gas, a one-way valve 14 is installed on the connecting gas pipe 13 to prevent natural gas backflow, and a nozzle 15 is installed at one end of the connecting gas pipe 13 facing the carbon dioxide absorption pipe 17.

[0057] In addition, a cover plate 7 is fixed on the upper surface of the rotor 8. Preferably, the cover plate 7 is detachably connected to the rotor 8 to facilitate the maintenance and loading and unloading of the semipermeable membrane assembly 31 in the later stage. A sealing gasket adapted to the decarbonization chamber 10 is provided on the lower surface of the cover plate 7 to improve the sealing effect of the decarbonization chamber 10. The upper end of the carbon dioxide absorption tube 17 passes through the cover plate 7 and is rotatably connected to the liquid injection tube 6 through a bearing, which is beneficial to the input of the carbon dioxide absorption liquid.

[0058] like Figure 1 As shown, in order to facilitate the reuse of the carbon dioxide absorption liquid, a waste liquid chamber 22 is provided in the space below the receiving tray 16 of the treatment tank 1, and a discharge pipe 2 is provided at the lower end of the outer side of the waste liquid chamber 22. A control valve can be installed on the discharge pipe 2 to control the discharge of the carbon dioxide absorption liquid, and an overflow hole 4 is provided on the outer side of the waste liquid chamber 22 near the receiving tray 16 to avoid excessive accumulation of carbon dioxide absorption liquid inside the waste liquid chamber 22.

[0059] When in use (working), the pretreated natural gas is input from the air inlet pipe 3, the carbon dioxide absorption liquid is input from the injection pipe 6 to the carbon dioxide absorption pipe 17, the motor 18 is started, and the motor 18 drives the rotating shaft 19 to rotate, which further rotates the worm 20, and the worm 20 is meshed with the worm wheel 21, so that the worm wheel 21 drives the carbon dioxide absorption pipe 17 to rotate, and further rotates the rotor 8.

[0060] When the air intake pipe 3 contacts the connecting air pipe 13, the natural gas enters the decarbonization chamber 10 from the air intake pipe 3 and the connecting air pipe 13, and the carbon dioxide is removed through the semipermeable membrane assembly 31. The removed carbon dioxide enters the carbon dioxide absorption pipe 17 through the first connecting capillary 26 and reacts with the carbon dioxide absorption liquid to absorb the carbon dioxide, thereby avoiding the reflux of carbon dioxide caused by the change of air pressure in the decarbonization chamber 10. The absorbed carbon dioxide absorption liquid flows into the waste liquid chamber 22 and can be used for the rough decarbonization of natural gas.

[0061] As the rotor 8 rotates, the annular groove 35 and the arc-shaped abutment plate 36 rotate relative to each other. When the connecting slide 33 rotates to the arc-shaped abutment plate 36 with the rotor 8, the connecting slide 33 is squeezed by the arc-shaped abutment plate 36, so that the connecting slide 33 moves toward the carbon dioxide absorption tube 17, and further the piston plate 32 moves toward the carbon dioxide absorption tube 17, so that the natural gas inside the decarbonization chamber 10 is squeezed, and the air pressure on the side of the semipermeable membrane assembly 31 inside the decarbonization chamber 10 away from the carbon dioxide absorption tube 17 is increased, so that a positive pressure difference is generated on both sides of the semipermeable membrane assembly 31, and the decarbonization of the natural gas is accelerated. When the natural gas exhaust hole 12 is connected to the arc-shaped groove 30, the decarbonized natural gas inside the decarbonization chamber 10 flows out through the natural gas exhaust hole 12 and the arc-shaped groove 30, and the suction pump 23 is started, thereby accelerating the output of the decarbonized natural gas.

[0062] In this process, by setting the second venturi tube 25 and the second connecting capillary 24, the air flow velocity of the decarbonized natural gas at the throat of the second venturi tube 25 is increased and the air pressure is reduced when the decarbonized natural gas is output, so that the throat of the second venturi tube 25 has a certain adsorption effect, and the second connecting capillary 24 further sucks the natural gas in the gap between the receiving plate 16 and the rotor 8, thereby reducing natural gas leakage.

[0063] When the connecting slide plate 33 is separated from the arc-shaped abutment plate 36 , the elastic potential energy of the spring 34 is released, so that the piston plate 32 is reset.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0065] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A natural gas decarbonization device, comprising a processing tank (1), characterized in that: The processing tank (1) is provided with an air inlet pipe (3) on the outside thereof, and further comprises: A carbon dioxide absorption pipe (17), wherein the carbon dioxide absorption pipe (17) is rotatably mounted in the processing tank (1); A rotor (8), the rotor (8) being fixed to the outside of the carbon dioxide absorption pipe (17), and the rotor (8) being rotatably connected to the inner wall of the processing tank (1), the rotor (8) being radially provided with a decarbonization chamber (10), a semipermeable membrane assembly (31) being detachably fixed in the decarbonization chamber (10), and a pressure difference existing on both sides of the semipermeable membrane assembly (31) so as to accelerate the decarbonization of the natural gas in the decarbonization chamber (10); a connecting gas pipe (13), the connecting gas pipe (13) being arranged at one end of the decarbonization chamber (10) away from the carbon dioxide absorption pipe (17), the connecting gas pipe (13) being butted against the gas outlet end of the gas inlet pipe (3) during one rotation, so as to be used for inputting natural gas into the decarbonization chamber (10); A natural gas exhaust hole (12), wherein the natural gas exhaust hole (12) is arranged at the bottom of the decarbonization chamber (10), and the natural gas exhaust hole (12) is located on a side of the semipermeable membrane assembly (31) away from the carbon dioxide absorption tube (17); A receiving plate (16), the receiving plate (16) being fixed in the processing tank (1), and a connecting ring (29) being fixed on the upper surface of the receiving plate (16) and being in contact with the lower surface of the rotor (8), the connecting ring (29) being provided with an arc groove (30), and the natural gas exhaust hole (12) being connected with the arc groove (30) during one rotation process, so as to be used for the output of the natural gas after decarbonization; The carbon dioxide absorption tube (17) is provided with a high-speed flowing carbon dioxide absorption liquid inside, and first connecting capillaries (26) which are connected one-to-one with the decarbonization chamber (10) are radially installed around the carbon dioxide absorption tube (17), and the connection part between the first connecting capillaries (26) and the decarbonization chamber (10) is located on a side of the semipermeable membrane assembly (31) close to the carbon dioxide absorption tube (17) for outputting carbon dioxide in the decarbonization chamber (10).

2. A natural gas decarbonization device according to claim 1, characterized in that: The carbon dioxide absorption tube (17) is a Venturi tube, and the first connecting capillary tube (26) is arranged at the throat of the carbon dioxide absorption tube (17). The air pressure at the throat of the carbon dioxide absorption tube (17) is the lowest, generating an adsorption effect to accelerate the output of carbon dioxide from the decarbonization chamber (10).

3. A natural gas decarbonization device according to claim 1 or 2, characterized in that: The side wall of the rotor (8) is provided with an annular groove (35), and an arc-shaped abutment plate (36) is fixed inside the processing tank (1), and the arc-shaped abutment plate (36) is slidably connected to the annular groove (35); A piston plate (32) adapted to the connecting air pipe (13) is slidably mounted inside the decarburization chamber (10), and a spring (34) for driving the piston plate (32) to slide inside the decarburization chamber (10) is mounted outside the connecting air pipe (13); A connecting slide plate (33) is fixed to a side of the piston plate (32) close to the inner wall of the treatment tank (1). After the connecting slide plate (33) rotates with the rotor (8) to the arc-shaped abutment plate (36), the arc-shaped abutment plate (36) presses the connecting slide plate (33) to move in the direction of the carbon dioxide absorption tube (17), so that the air pressure inside the decarbonization chamber (10) on the side of the semipermeable membrane assembly (31) away from the carbon dioxide absorption tube (17) increases.

4. A natural gas decarbonization device according to claim 3, characterized in that: The arc angle corresponding to the arc-shaped abutment plate (36) is 90°-270°, and the radial diameter of the arc-shaped abutment plate (36) gradually increases along the rotation direction of the rotor (8); The arc-shaped groove (30) is within the arc angle range corresponding to the arc-shaped abutment plate (36), and the air intake pipe (3) is outside the arc angle range corresponding to the arc-shaped abutment plate (36).

5. A natural gas decarbonization device according to claim 4, characterized in that: A second sealing ring (27) is provided at the bottom of the rotor (8) and located outside the connecting ring (29), and a connecting sliding groove (28) adapted to the second sealing ring (27) is provided on the upper surface of the receiving plate (16).

6. A natural gas decarbonization device according to claim 5, characterized in that: A suction pump (23) is fixed at the bottom of the receiving plate (16); the suction end of the suction pump (23) is in communication with the arc-shaped groove (30); and a second venturi tube (25) is installed at the exhaust end of the suction pump (23); and the output end of the second venturi tube (25) is provided with an exhaust pipe (5) penetrating the outer wall of the treatment tank (1); A second connecting capillary (24) is installed at the throat of the second venturi tube (25), and the other end of the second connecting capillary (24) passes through the receiving plate (16) and is arranged between the connecting slide groove (28) and the connecting ring (29).

7. A natural gas decarbonization device according to claim 6, characterized in that: A motor (18) is fixed to the lower surface of the receiving plate (16); a rotating shaft (19) rotatably connected to the inner wall of the processing tank (1) is fixed to the output end of the motor (18); a worm (20) is mounted on the rotating shaft (19); The carbon dioxide absorption tube (17) is rotatably connected to the receiving plate (16), and the lower end of the carbon dioxide absorption tube (17) passes through the receiving plate (16) and is provided with a worm gear (21), wherein the worm gear (21) is meshed with the worm (20).

8. A natural gas decarbonization device according to claim 7, characterized in that: The semipermeable membrane assembly (31) comprises a mounting plate (3101) symmetrically mounted on the inner wall of the decarbonization chamber (10), at least two grid support plates (3102) are fixed between the two mounting plates (3101), and a semipermeable membrane (3103) is mounted inside the gap between the grid support plates (3102).

9. A natural gas decarbonization device according to claim 8, characterized in that: First sealing rings (9) are fixed to both upper and lower ends of the outer side of the rotor (8), and an inner wall of the processing tank (1) is provided with an engaging groove slidably connected to the first sealing ring (9); A one-way valve (14) is installed on the connecting air pipe (13), and a nozzle (15) is installed on one end of the connecting air pipe (13) facing the carbon dioxide absorption pipe (17); A cover plate (7) is fixed to the upper surface of the rotor (8), a sealing gasket adapted to the decarbonization chamber (10) is provided on the lower surface of the cover plate (7), and the upper end of the carbon dioxide absorption tube (17) passes through the cover plate (7) and is rotatably connected to the injection tube (6) via a bearing.

10. A natural gas decarbonization device according to claim 9, characterized in that: The processing tank (1) is provided with a waste liquid chamber (22) in the space below the receiving plate (16), a discharge pipe (2) is provided at the lower end of the outer side of the waste liquid chamber (22), and an overflow hole (4) is provided at the outer side of the waste liquid chamber (22) near the receiving plate (16).

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