A spiral inner groove tube bundle reactor for coal bed gas purification by gas hydrate method

Abstract

This invention discloses a spiral inner-trough tube bundle reactor for coalbed methane purification using the gas hydrate method. The reactor includes a reactor shell with a reaction space inside. A support frame is located inside the reactor shell, and the support frame has a connecting port. A tube bundle reaction mechanism is located inside the reactor shell above the support frame, with its lower end rotatably penetrating the support frame. An exhaust hood is located inside the reactor shell at the top of the tube bundle reaction mechanism, rotatably connected to the tube bundle reaction mechanism. An exhaust port is located at the top of the exhaust hood, with its upper end penetrating the top of the reactor shell. This invention, through a series of structures, achieves primary gas hydrate coalbed methane purification by stirring and mixing coalbed methane with a reaction solution, and secondary gas hydrate coalbed methane purification by spraying and cooling the tube bundle reaction mechanism. This multiple, continuous gas hydrate coalbed methane purification process results in high purification rates and is energy-efficient and environmentally friendly.

Description

Technical Field

[0001] This invention relates to the field of coalbed methane purification reactor technology, specifically to a spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method. Background Technology

[0002] Coalbed methane (CBM) is primarily composed of methane, a gas that is generated during the formation and metamorphism of coal. The gas produced during coal formation is formed from the decomposition of cellulose and organic matter by anaerobic bacteria during the early stages of coal deposition. The main component (95%) of CBM is natural gas. Studies have found that natural gas hydrates have a considerable gas storage capacity; typically, 1 m³ of hydrate can store approximately 150–180 m³ of natural gas. Different forms of gas hydrates can be stored at -25 to -10°C and at normal pressure. After gasification, they can be efficiently utilized, enabling the safe storage and transportation of gases such as natural gas, CBM, landfill gas, and biogas. Industry scholars have found that, under the same conditions, hydrated natural gas storage and transportation technology has a 19% lower capital cost than liquefied petroleum gas (LPG) storage and transportation technology and a 30% lower capital cost than compressed natural gas (CNG) storage and transportation technology, significantly reducing storage and transportation costs. Coalbed methane can be purified through the gas hydrate method. According to hydrate theory, when a gas mixture forms hydrates, the concentrations of these gases in the hydrate phase and the gas phase are different. Therefore, gas components that are more likely to form hydrates are selectively enriched in the hydrate phase, while gas components that are less likely to form hydrates are selectively enriched in the gas phase, thus achieving the effect of separating the gas mixture.

[0003] Currently, the coalbed methane gas hydrate purification method directly introduces coalbed methane into the reaction solution used for gas hydrate purification, or into a tube bundle reactor. The short contact and fusion time between coalbed methane and the reaction solution, the small contact area, and the uniform reaction temperature result in incomplete purification and low purification rate of coalbed methane gas hydrate purification using a single reaction method. The discharged gas has a high residual natural gas content, high cost, and significant resource waste. Summary of the Invention

[0004] The purpose of this invention is to provide a spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a spiral inner-trough tube bundle reactor for coalbed methane purification using the gas hydrate method, comprising a reactor shell, an internal reaction space, a support frame, a communication port, a tube bundle reaction mechanism located inside the reactor shell above the support frame, the lower end of the tube bundle reaction mechanism rotatably penetrating the support frame, an exhaust hood located inside the reactor shell at the top of the tube bundle reaction mechanism, the tube bundle reaction mechanism and the exhaust hood being rotatably connected, an exhaust port located at the top of the exhaust hood, the upper end of the exhaust port penetrating the top of the reactor shell, a lower rotating rod connected to the bottom of the tube bundle reaction mechanism, and an upper rotating rod connected to the top of the tube bundle reaction mechanism. Both the upper and lower rotating rods are hollow structures. The tube bundle reaction mechanism is connected to the refrigeration circulation mechanism via the lower and upper rotating rods. The lower end of the lower rotating rod is sealed and passes through the reactor shell and is connected to the rotation mechanism. The lower end of the reactor shell is a reaction mixing chamber. An air inlet is located at the lower end of one side of the reactor shell. A gas distribution plate is located at the lower end of the reaction mixing chamber and is connected to the air inlet. An outlet is located on one side of the reactor shell at the upper end of the reaction mixing chamber. A spray assembly is located inside the reactor shell. A spray circulation mechanism is located on one side of the reactor shell and is connected to the outlet via the spray circulation mechanism. An agitation mechanism is located on the lower rotating rod inside the reaction mixing chamber. A cleaning port is located on the lower end of the reactor shell on one side of the reaction mixing chamber. The tube bundle reaction mechanism includes a tube bundle reaction shell, an annular slider, a lower gas distribution inlet plate, an upper buffer exhaust plate, spiral inner groove fittings, and a refrigerant cavity. The lower gas distribution inlet plate is located at the bottom of the tube bundle reaction shell, and an annular slider is located on the outer circumference of the lower gas distribution inlet plate. An annular groove is located on the support frame, and the annular slider is slidably located inside the annular groove. An inlet panel is located at the bottom of the lower gas distribution inlet plate, and the inlet panel has several inlet holes. An upper buffer exhaust plate is located at the top of the tube bundle reaction shell, and an exhaust panel is located at the top of the upper buffer exhaust plate, and the exhaust panel has several exhaust holes. Several spiral inner groove fittings are connected between the lower gas distribution inlet plate and the upper buffer exhaust plate.

[0006] Preferably, the internal space of the tube bundle reaction shell between the lower air inlet plate and the upper buffer exhaust plate is set as a refrigerant cavity. A lower rotating rod is fixedly installed in the middle of the bottom of the lower air inlet plate. The lower rotating rod is sealed through the lower air inlet plate and connected to the refrigerant cavity. An upper rotating rod is fixedly installed in the middle of the bottom of the upper buffer exhaust plate. The upper rotating rod is sealed through the upper buffer exhaust plate and connected to the refrigerant cavity.

[0007] Preferably, the refrigeration cycle mechanism includes an upper rotary joint, a lower rotary joint, a first circulation pipe, a cooler, a circulation pump, and a second circulation pipe. The bottom of the lower rotary rod passes through the bottom of the reactor shell and is connected to the lower rotary joint. The top of the upper rotary rod passes through the exhaust hood and is connected to the upper rotary joint through the exhaust port of the reactor shell. The upper rotary joint is connected to the output end of the circulation pump through the second circulation pipe. The input end of the circulation pump is connected to the output end of the cooler through the second circulation pipe. The input end of the cooler is connected to the lower rotary joint through the first circulation pipe.

[0008] Preferably, the agitation mechanism includes rotating blades, connecting rods, and discharge scrapers. Discharge scrapers are provided on both sides of the lower rotating rod at the horizontal height of the discharge port via connecting rods. The end of the discharge scraper away from the connecting rod is located close to the inner wall of the reactor shell. Rotating blades are provided on the lower rotating rod between the connecting rod and the gas distribution plate.

[0009] Preferably, the rotating mechanism includes a drive box, a first bevel gear, a second bevel gear, and a servo motor. The drive box is located at the bottom of the reactor shell. The drive box contains a first bevel gear and a second bevel gear, which are meshed together. A lower rotating rod is fixedly connected to the lower rotating joint through the first bevel gear. One side of the second bevel gear is connected to the output end of the servo motor on one side of the drive box via a coupling.

[0010] Preferably, the spray assembly includes a lower spray plate and an upper spray plate. The lower spray plate is provided inside the reactor shell between the reaction mixing chamber and the support frame, and the upper spray plate is provided inside the reactor shell above the tube bundle reaction mechanism. The upper spray plate is installed through the exhaust hood, and the bottom of both the lower and upper spray plates is provided with several evenly distributed spray heads.

[0011] Preferably, the spray circulation mechanism includes a discharge pipe, a storage tank, a filter screen, a high-pressure pump, a connecting pipe, a branch water pipe, and a regulating valve. The input ends of both the lower and upper spray plates are connected to the branch water pipe. A discharge pipe is provided at the discharge port. A storage tank is provided on one side of the reactor shell. The outlet end of the discharge pipe is located at the upper end inside the storage tank. A filter screen is provided at the lower end inside the storage tank. The lower end of one side of the storage tank is connected to the input end of the high-pressure pump through a connecting pipe. The output end of the high-pressure pump is connected to the branch water pipe through a connecting pipe. A regulating valve is provided on the branch water pipe.

[0012] Preferably, the upper end of the exhaust hood is provided with an arc-shaped hood structure, and the interior of the exhaust hood above the upper spray plate is provided with a water vapor isolation membrane.

[0013] Preferably, the upper end of the exhaust port extends out of the top of the reactor shell, and an exhaust interface is provided on the exhaust port side outside the reactor shell. The exhaust interface is connected to an air purification device through an exhaust pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This spiral internal groove tube bundle reactor is used for coalbed methane purification via gas hydrate method. Through the tube bundle reaction mechanism, reaction mixing chamber and spray assembly set inside the reactor shell, coalbed methane is introduced into the reaction mixing chamber through the gas distribution plate to contact the reaction solution for primary gas hydrate purification. The coalbed methane purified by primary gas hydrate method in the reaction mixing chamber enters the tube bundle reaction mechanism for secondary gas hydrate purification. Thus, this reactor has multiple continuous gas hydrate method coalbed methane purification processes, resulting in a higher coalbed methane purification rate.

[0015] This spiral inner groove tube bundle reactor is used for coalbed methane purification via the gas hydrate method. Several interconnected spiral inner groove tubes are installed between the lower gas inlet plate and the upper buffer exhaust plate. The internal space of the tube bundle reaction shell between the lower gas inlet plate and the upper buffer exhaust plate is a refrigerant chamber. A lower rotating rod fixedly installed at the bottom center of the lower gas inlet plate communicates with the refrigerant chamber, and an upper rotating rod fixedly installed at the bottom center of the upper buffer exhaust plate communicates with the refrigerant chamber. In conjunction with a refrigeration circulation mechanism consisting of an upper rotary joint, a lower rotary joint, a first circulation pipe, a cooler, a circulation pump, and a second circulation pipe, coalbed methane flows upwards within the spiral inner groove tubes, and refrigerant circulates downwards within the refrigerant chamber. Combined with an upper spray plate installed in the exhaust hood above the tube bundle reaction mechanism, the coalbed methane undergoes secondary gas hydrate purification through the spiral inner groove tubes, resulting in more thorough purification. The circulation of the refrigerant and the spray circulation of the reaction solution make the equipment energy-saving and environmentally friendly.

[0016] This spiral inner-trough tube bundle reactor for coalbed methane purification using the gas hydrate method utilizes a rotating mechanism that works in conjunction with the lower and upper rotating rods on the tube bundle reaction mechanism to achieve rotation. This facilitates the separation of the coalbed methane gas hydrate purification products. Furthermore, the rotating blades and discharge scraper on the lower rotating rod enhance the mixing of coalbed methane with the reaction solution within the reaction mixing chamber, thereby increasing the primary gas hydrate coalbed methane purification rate. The discharge scraper conveniently removes the purified coalbed methane gas hydrate products. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the lower rotating rod in this invention; Figure 3 This is a schematic diagram of the tube bundle reaction mechanism in this invention; Figure 4 This is a schematic diagram of the spiral inner groove tube fitting in this invention; Figure 5 This is a schematic diagram of the air intake panel in this invention; Figure 6 This is a schematic diagram of the exhaust hood in this invention.

[0018] In the diagram: 1. Reactor shell; 2. Support frame; 3. Tube bundle reaction mechanism; 31. Tube bundle reaction shell; 32. Annular slider; 33. Lower gas distribution and inlet plate; 331. Inlet panel; 34. Upper buffer exhaust plate; 341. Exhaust panel; 35. Spiral inner groove pipe fitting; 36. Refrigerant chamber; 4. Exhaust hood; 41. Exhaust port; 42. Water vapor isolation membrane; 5. Rotating mechanism; 51. Drive box; 52. First bevel gear; 53. Second bevel gear; 54. Servo motor; 6. Lower rotating rod; 61. Upper rotating rod. 62. Moving rod; 63. Rotating blade; 64. Connecting rod; 7. Discharge scraper; 8. Reaction mixing chamber; 9. Air inlet; 10. Air distribution plate; 11. Lower spray plate; 12. Upper spray plate; 13. Lower rotary joint; 14. No. 1 circulation pipe; 15. Refrigerator; 16. Circulation pump; 17. No. 2 circulation pipe; 18. Discharge port; 19. Discharge pipe; 20. Storage tank; 21. Filter screen; 22. High-pressure pump; 23. Connecting pipe; 24. Branch water pipe; 25. Regulating valve; 26. Cleaning port. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for 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. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0022] like Figures 1 to 6 As shown, the spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method in this embodiment includes a reactor shell 1. The reactor shell 1 has a reaction space inside, and a support frame 2 inside. The support frame 2 has a communication port. A tube bundle reaction mechanism 3 is located inside the reactor shell 1 above the support frame 2. The lower end of the tube bundle reaction mechanism 3 rotatably penetrates the support frame 2. An exhaust hood 4 is located inside the reactor shell 1 at the top of the tube bundle reaction mechanism 3. The tube bundle reaction mechanism 3 and the exhaust hood 4 are rotatably connected. An exhaust port 41 is located at the top of the exhaust hood 4, and its upper end penetrates the top of the reactor shell 1. A lower rotating rod 6 is connected to the bottom of the tube bundle reaction mechanism 3, and an upper rotating rod 61 is connected to the top of the tube bundle reaction mechanism 3. Both the lower and upper rotating rods 6 and 61 are hollow structures. The tube bundle reaction mechanism 3 is connected to a refrigeration cycle mechanism through the lower and upper rotating rods 6 and 61. The lower end of the lower rotating rod 6 is sealed and penetrates the reactor shell 1 to connect with a rotating mechanism 5. The lower end of the reactor housing 1 is configured as a reaction mixing chamber 7. The lower end of one side of the reactor housing 1 is provided with an air inlet 8. The lower end of the reaction mixing chamber 7 is provided with a gas distribution plate 9, which is connected to the air inlet 8. The upper side of the reactor housing 1 of the reaction mixing chamber 7 is provided with a discharge port 18. The interior of the reactor housing 1 is provided with a spray assembly. One side of the reactor housing 1 is provided with a spray circulation mechanism. The spray assembly is connected to the discharge port 18 through the spray circulation mechanism. The lower rotating rod 6 inside the reaction mixing chamber 7 is provided with a stirring mechanism. The lower end of one side of the reactor housing 1 of the reaction mixing chamber 7 is provided with a cleaning port 26, which is provided with a valve. This equipment has a primary gas hydrate method for coalbed methane purification by stirring and mixing coalbed methane and reaction solution, and a secondary gas hydrate method for coalbed methane purification by spraying and cooling the tube bundle reaction mechanism 3. Multiple continuous gas hydrate method coalbed methane purifications result in a higher coalbed methane purification rate. It realizes the circulation of the refrigerant and the circulation of the reaction solution spray in the gas hydrate method coalbed methane purification. The equipment is energy-saving and environmentally friendly. The tube bundle reaction mechanism 3 includes a tube bundle reaction shell 31, an annular slider 32, a lower gas distribution inlet plate 33, an upper buffer exhaust plate 34, a spiral inner groove pipe 35, and a refrigerant chamber 36. The bottom of the tube bundle reaction shell 31 is provided with a lower gas distribution inlet plate 33, and an annular slider 32 is provided on the outer circumference of the lower gas distribution inlet plate 33. The support frame 2 is provided with an annular groove, and the annular slider 32 is slidably disposed inside the annular groove. The bottom of the lower gas distribution inlet plate 33 is provided with an inlet panel 331, and the inlet panel 331 is provided with several inlet holes. The top of the tube bundle reaction shell 31 is provided with an upper buffer exhaust plate 34, and the top of the upper buffer exhaust plate 34 is provided with an exhaust panel 341, and the exhaust panel 341 is provided with several exhaust holes. Several spiral inner groove pipes 35 are provided between the lower gas distribution inlet plate 33 and the upper buffer exhaust plate 34.

[0023] Specifically, the internal space of the tube bundle reaction shell 31 between the lower gas inlet plate 33 and the upper buffer exhaust plate 34 is set as a refrigerant cavity 36. A lower rotating rod 6 is fixedly installed in the middle of the bottom of the lower gas inlet plate 33. The lower rotating rod 6 is sealed through the lower gas inlet plate 33 and connected to the refrigerant cavity 36. An upper rotating rod 61 is fixedly installed in the middle of the bottom of the upper buffer exhaust plate 34. The upper rotating rod 61 is sealed through the upper buffer exhaust plate 34 and connected to the refrigerant cavity 36. The coalbed methane purified by the primary gas hydrate method discharged from the reaction solution enters the interior of the lower gas inlet plate 33 through the air inlet hole on the air inlet panel 331, and enters the spiral inner groove pipe fitting 35 through the lower gas inlet plate 33. The coalbed methane purified by the primary gas hydrate method flows from bottom to top through the spiral inner groove pipe fitting 35 and enters the interior of the upper buffer exhaust plate 34. It is discharged into the interior of the exhaust hood 4 through the exhaust hole on the exhaust panel 341.

[0024] Furthermore, the refrigeration cycle mechanism includes an upper rotary joint 12, a lower rotary joint 13, a first circulation pipe 14, a refrigerator 15, a circulation pump 16, and a second circulation pipe 17. The bottom of the lower rotating rod 61 passes through the bottom of the reactor shell 1 and connects to the lower rotary joint 13. The top of the upper rotating rod 61 passes through the exhaust hood 4 and is connected to the upper rotary joint 12 via the exhaust port 41. The upper rotary joint 12 is connected to the output end of the circulation pump 16 via the second circulation pipe 17. The input end of the circulation pump 16 is connected to the output end of the refrigerator 15 via the second circulation pipe 17. The input end of the refrigerator 15 is connected to the lower rotary joint 13 via the first circulation pipe 14. Under the action of the circulation pump 16, refrigeration... The refrigerant in the device 15 enters the refrigerant cavity 36 inside the tube bundle reaction shell 31 between the lower gas inlet plate 33 and the upper buffer exhaust plate 34 through the second circulation pipe 17 via the upper rotary joint 12 and the upper rotating rod 61 of the hollow structure. The refrigerant circulates from top to bottom through the tube bundle reaction mechanism 3 in the refrigerant cavity 36, and returns to the refrigerator 15 through the lower rotating rod 6, the lower rotary joint 13 and the first circulation pipe 14 of the hollow structure. Thus, the coalbed methane purified by the primary gas hydrate method is purified by the secondary gas hydrate method through the spiral inner groove pipe fitting 35 and is refrigerated. The refrigeration flow direction is set opposite to the coalbed methane flow direction, and the contact area of ​​the secondary gas hydrate purification circulation refrigeration of coalbed methane is large.

[0025] Furthermore, the agitation mechanism includes rotating blades 62, connecting rods 63, and discharge scrapers 64. Discharge scrapers 64 are provided on both sides of the lower rotating rod 6 at the horizontal height of the discharge port 18 via connecting rods 63. The end of the discharge scraper 64 away from the connecting rod 63 is positioned close to the inner wall of the reactor shell 1. Rotating blades 62 are provided on the lower rotating rod 6 between the connecting rod 63 and the gas distribution plate 9. The rotating blades 62 mounted on the lower rotating rod 6 rotate within the reaction mixing chamber 7, agitating the reaction solution. This agitation increases the purification rate of primary gas hydrate coalbed methane in the reaction solution, thereby improving the purification rate of primary gas hydrate coalbed methane in the equipment. The rotating discharge scrapers 64 on the lower rotating rod 6 scrape and discharge the purified coalbed methane hydrate product, facilitating convenient discharge.

[0026] Furthermore, the rotating mechanism 5 includes a drive box 51, a first bevel gear 52, a second bevel gear 53, and a servo motor 54. The drive box 51 is located at the bottom of the reactor shell 1. The drive box 51 contains a first bevel gear 52 and a second bevel gear 53, which are meshed together. The lower rotating rod 6 is fixedly connected to the lower rotating joint 13 through the first bevel gear 52. One side of the second bevel gear 53 is connected to the output end of the servo motor 54 on one side of the drive box 51 via a coupling. The servo motor 54 on the drive box 51 drives the second bevel gear 53 to rotate. The rotation of the second bevel gear 53 drives the lower rotating rod 6 to rotate through the first bevel gear 52 meshing with it. The rotation of the lower rotating rod 6 can drive the rotating blade 62, the discharge scraper 64, and the tube bundle reaction mechanism 3 to rotate synchronously.

[0027] Furthermore, the spray assembly includes a lower spray plate 10 and an upper spray plate 11. The lower spray plate 10 is provided inside the reactor shell 1 between the reaction mixing chamber 7 and the support frame 2, and the upper spray plate 11 is provided inside the reactor shell 1 above the tube bundle reaction mechanism 3. The upper spray plate 11 is installed through the exhaust hood 4. The bottom of both the lower spray plate 10 and the upper spray plate 11 is provided with several evenly distributed spray heads. The upper spray plate 11 sprays water onto the tube bundle reaction mechanism 3. The spray water flows from top to bottom through the exhaust holes on the exhaust panel 341, through the upper buffer exhaust plate 34, the spiral inner groove pipe 35, and the lower air distribution inlet plate 33, and finally falls into the reaction mixing chamber 7 through the air inlet holes on the air inlet panel 331.

[0028] Furthermore, the spray circulation mechanism includes a discharge pipe 19, a storage tank 20, a filter screen 21, a high-pressure pump 22, a connecting pipe 23, a branch water pipe 24, and a regulating valve 25. The input ends of the lower spray plate 10 and the upper spray plate 11 are both connected to the branch water pipe 24. A discharge pipe 19 is provided on the discharge port 18. A storage tank 20 is provided on one side of the reactor shell 1. The outlet end of the discharge pipe 19 is located at the upper end of the storage tank 20. A filter screen 21 is provided at the lower end of the storage tank 20. A discharge port is provided on the storage tank 20. Opening the discharge port is used to remove the product from the storage tank 20. The lower end of one side of the storage tank 20 is connected to the input end of the high-pressure pump 22 through the connecting pipe 23. The output end of the high-pressure pump 22 is connected to the branch water pipe 24 through the connecting pipe 23. The branch water pipe 24 is equipped with a regulating valve 25. The product suspended on the upper layer of the reaction solution enters the storage tank 20 through the discharge pipe 19 along with the reaction solution from the discharge port 18. The discharged reaction solution and product are filtered through the filter screen 21. Under the action of the high-pressure pump 22, the filtered reaction solution in the storage tank 20 enters the upper spray plate 11 and the lower spray plate 10 through the connecting pipe 23 and the branch water pipe 24.

[0029] Furthermore, the upper end of the exhaust hood 4 is set with an arc-shaped hood structure, and the interior of the exhaust hood 4 above the upper spray plate 11 is provided with a water vapor isolation membrane 42. The water vapor isolation membrane 42 separates the water vapor part in the exhaust gas to prevent the exhaust from carrying water vapor out.

[0030] Furthermore, the upper end of the exhaust port 41 extends out of the top of the reactor shell 1, and an exhaust interface is provided on one side of the exhaust port 41 outside the reactor shell 1. The exhaust interface is connected to an air purification device through an exhaust pipe, which can purify the gas discharged from the coalbed methane purification process.

[0031] The usage method of this embodiment is as follows: Coalbed methane is uniformly introduced into the reaction solution in the reaction mixing chamber 7 through the air inlet 8 and the air distribution plate 9. The servo motor 54 on the drive box 51 drives the second bevel gear 53 to rotate. The rotation of the second bevel gear 53 drives the lower rotating rod 6 to rotate through the first bevel gear 52 meshing with it. The rotating blades 62 installed on the lower rotating rod 6 rotate in the reaction mixing chamber 7, stirring the reaction solution. Stirring can increase the purification of primary gas hydrate coalbed methane in the reaction solution, thereby increasing the purification rate of primary gas hydrate coalbed methane in the equipment. The coalbed methane purified by primary gas hydrate discharged from the reaction solution enters the interior of the lower air distribution plate 33 through the air inlet hole on the air inlet panel 331. The coalbed methane purified by the primary gas hydrate method flows from bottom to top through the spiral inner groove pipe fitting 35 and enters the interior of the upper buffer exhaust plate 34. It is then discharged through the exhaust holes on the exhaust panel 341 into the interior of the exhaust hood 4 and finally discharged from the exhaust port 41. During the process of the coalbed methane purified by the primary gas hydrate method flowing through the spiral inner groove pipe fitting 35, the upper spray plate 11 sprays water onto the tube bundle reaction mechanism 3. The spray water flows from top to bottom through the exhaust holes on the exhaust panel 341, through the upper buffer exhaust plate 34, the spiral inner groove pipe fitting 35, and the lower gas distribution and intake plate 33, and finally falls into the reaction mixing chamber 7 through the intake holes on the intake panel 331. Under the action of the rotation of the lower rotating rod 6, the tube bundle reaction mechanism 3 is activated. The rotating function facilitates the separation of coalbed methane hydrate purification products on the spiral inner groove pipe fitting 35. Simultaneously, under the action of the circulating pump 16, the refrigerant in the cooler 15 enters the refrigerant cavity 36 inside the tube bundle reaction shell 31 between the lower gas distribution inlet plate 33 and the upper buffer exhaust plate 34 through the second circulation pipe 17, the upper rotary joint 12, and the hollow upper rotating rod 61. The refrigerant circulates from top to bottom through the tube bundle reaction mechanism 3 within the refrigerant cavity 36, returning to the cooler 15 through the hollow lower rotating rod 6, the lower rotary joint 13, and the first circulation pipe 14. Thus, the coalbed methane purified by the primary gas hydrate method undergoes secondary gas hydrate purification through the spiral inner groove pipe fitting 35, resulting in more thorough coalbed methane purification and improved efficiency. The cold flow direction is set opposite to the coalbed methane flow direction. The secondary gas hydrate purification cycle of coalbed methane has a large contact area for cooling. The coalbed methane gas hydrate purification product is suspended in the upper reaction solution in the reaction mixing chamber 7. As the reaction solution in the reaction mixing chamber 7 increases, the discharge port 18 is opened, and the discharge scraper 64 on the lower rotating rod 6 rotates to scrape and discharge the coalbed methane gas hydrate purification product. The discharge is convenient. The product suspended in the upper layer of the reaction solution enters the storage tank 20 through the discharge port 18 and the discharge pipe 19 along with the reaction solution. The discharged reaction solution and product are filtered through the filter screen 21. Under the action of the high-pressure pump 22, the filtered reaction solution in the storage tank 20 enters the upper spray plate 11 and the lower spray plate 10 through the connecting pipe 23 and the branch water pipe 24.Thus, the coalbed methane purified by the primary gas hydrate method is further purified by spraying before entering the tube bundle reaction mechanism 3 for secondary purification. This achieves circulation of the refrigerant and the reaction solution spraying in the gas hydrate coalbed methane purification process. The equipment is energy-saving and environmentally friendly. Therefore, this equipment combines primary gas hydrate coalbed methane purification through agitation and mixing of coalbed methane and reaction solution, with secondary gas hydrate coalbed methane purification through spraying and cooling rotation of the tube bundle reaction mechanism 3. Multiple continuous gas hydrate coalbed methane purification processes result in a higher coalbed methane purification rate.

[0032] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method, comprising a reactor shell (1), characterized in that: The reactor shell (1) has a reaction space inside, and a support frame (2) is provided inside the reactor shell (1). The support frame (2) has a communication port. The reactor shell (1) above the support frame (2) has a tube bundle reaction mechanism (3). The lower end of the tube bundle reaction mechanism (3) is rotatably connected through the support frame (2). The reactor shell (1) at the top of the tube bundle reaction mechanism (3) has an exhaust hood (4). The tube bundle reaction mechanism (3) and the exhaust hood (4) are rotatably connected. The top of the exhaust hood (4) has an exhaust port (41). The upper end of the exhaust port (41) is connected through the top of the reactor shell (1). The bottom of the tube bundle reaction mechanism (3) is connected to a lower rotating rod (6). The top of the tube bundle reaction mechanism (3) is connected to an upper rotating rod (61). Both the lower rotating rod (6) and the upper rotating rod (61) are hollow structures. The tube bundle reaction mechanism (3) is connected to... The lower rotating rod (6) and the upper rotating rod (61) are connected to the refrigeration cycle mechanism. The lower end of the lower rotating rod (6) is sealed and penetrates the reactor shell (1) and is connected to the rotating mechanism (5). The lower end of the reactor shell (1) is set as the reaction mixing chamber (7). The lower end of one side of the reactor shell (1) is provided with an air inlet (8). The lower end of the reaction mixing chamber (7) is provided with a gas distribution plate (9). The gas distribution plate (9) is connected to the air inlet (8). The upper side of the reactor shell (1) of the reaction mixing chamber (7) is provided with a discharge port (18). The interior of the reactor shell (1) is provided with a spray assembly. The side of the reactor shell (1) is provided with a spray circulation mechanism. The spray assembly is connected to the discharge port (18) through the spray circulation mechanism. The lower rotating rod (6) inside the reaction mixing chamber (7) is provided with a stirring mechanism. The lower end of one side of the reactor shell (1) of the reaction mixing chamber (7) is provided with a cleaning port (26). The tube bundle reaction mechanism (3) includes a tube bundle reaction shell (31), an annular slider (32), a lower gas distribution inlet plate (33), an upper buffer exhaust plate (34), a spiral inner groove tube (35), and a refrigerant chamber (36). The bottom of the tube bundle reaction shell (31) is provided with a lower gas distribution inlet plate (33), and an annular slider (32) is provided on the outer circumference of the lower gas distribution inlet plate (33). An annular groove is provided on the support frame (2), and the annular slider (32) slides in the annular groove. Inside, the bottom of the lower air distribution inlet plate (33) is provided with an air inlet panel (331), and the air inlet panel (331) is provided with several air inlet holes. The top of the tube bundle reaction shell (31) is provided with an upper buffer exhaust plate (34), and the top of the upper buffer exhaust plate (34) is provided with an exhaust panel (341), and the exhaust panel (341) is provided with several exhaust holes. Several interconnected spiral inner groove pipes (35) are provided between the lower air distribution inlet plate (33) and the upper buffer exhaust plate (34).

2. The spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method according to claim 1, characterized in that: The internal space of the tube bundle reaction shell (31) between the lower air inlet plate (33) and the upper buffer exhaust plate (34) is set as a refrigerant cavity (36). A lower rotating rod (6) is fixedly installed in the middle of the bottom of the lower air inlet plate (33). The lower rotating rod (6) is sealed through the lower air inlet plate (33) and connected to the refrigerant cavity (36). An upper rotating rod (61) is fixedly installed in the middle of the bottom of the upper buffer exhaust plate (34). The upper rotating rod (61) is sealed through the upper buffer exhaust plate (34) and connected to the refrigerant cavity (36).

3. The spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method according to claim 1, characterized in that: The refrigeration cycle mechanism includes an upper rotary joint (12), a lower rotary joint (13), a first circulation pipe (14), a refrigerator (15), a circulation pump (16), and a second circulation pipe (17). The bottom of the lower rotary rod (6) passes through the bottom of the reactor shell (1) and is connected to the lower rotary joint (13). The top of the upper rotary rod (61) passes through the exhaust hood (4) and is connected to the upper rotary joint (12) through the exhaust port (41) through the reactor shell (1). The upper rotary joint (12) is connected to the output end of the circulation pump (16) through the second circulation pipe (17). The input end of the circulation pump (16) is connected to the output end of the refrigerator (15) through the second circulation pipe (17). The input end of the refrigerator (15) is connected to the lower rotary joint (13) through the first circulation pipe (14).

4. The spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method according to claim 1, characterized in that: The stirring mechanism includes a rotating blade (62), a connecting rod (63), and a discharge scraper (64). The discharge scrapers (64) are provided on both sides of the lower rotating rod (6) at the horizontal height of the discharge port (18) via the connecting rod (63). The end of the discharge scraper (64) away from the connecting rod (63) is located close to the inner wall of the reactor shell (1). The rotating blade (62) is provided on the lower rotating rod (6) between the connecting rod (63) and the gas distribution plate (9).

5. A spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method according to claim 1, characterized in that: The rotating mechanism (5) includes a drive box (51), a first bevel gear (52), a second bevel gear (53), and a servo motor (54). The bottom of the reactor shell (1) is provided with a drive box (51). Inside the drive box (51) are a first bevel gear (52) and a second bevel gear (53). The first bevel gear (52) and the second bevel gear (53) are meshed together. The lower rotating rod (6) is fixedly connected through the first bevel gear (52) to the lower rotating joint (13). One side of the second bevel gear (53) is connected to the output end of the servo motor (54) on one side of the drive box (51) through a coupling.

6. A spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method according to claim 1, characterized in that: The spray assembly includes a lower spray plate (10) and an upper spray plate (11). The lower spray plate (10) is provided inside the reactor shell (1) between the reaction mixing chamber (7) and the support frame (2). The upper spray plate (11) is provided inside the reactor shell (1) above the tube bundle reaction mechanism (3). The upper spray plate (11) is installed through the exhaust hood (4). The bottom of both the lower spray plate (10) and the upper spray plate (11) is provided with several evenly distributed spray heads.

7. A spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method according to claim 6, characterized in that: The spray circulation mechanism includes a discharge pipe (19), a storage tank (20), a filter screen (21), a high-pressure pump (22), a connecting pipe (23), a branch water pipe (24), and a regulating valve (25). The input ends of the lower spray plate (10) and the upper spray plate (11) are connected to the branch water pipe (24). The discharge port (18) is provided with a discharge pipe (19). A storage tank (20) is provided on one side of the reactor shell (1). The outlet end of the discharge pipe (19) is located at the upper end inside the storage tank (20). A filter screen (21) is provided at the lower end inside the storage tank (20). The lower end of one side of the storage tank (20) is connected to the input end of the high-pressure pump (22) through the connecting pipe (23). The output end of the high-pressure pump (22) is connected to the branch water pipe (24) through the connecting pipe (23). A regulating valve (25) is provided on the branch water pipe (24).

8. A spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method according to claim 6, characterized in that: The upper end of the exhaust hood (4) is provided with an arc-shaped hood structure, and the interior of the exhaust hood (4) above the upper spray plate (11) is provided with a water vapor isolation membrane (42).

9. A spiral inner groove tube bundle reactor for coalbed methane purification using the gas hydrate method according to claim 1, characterized in that: The upper end of the exhaust port (41) extends out of the top of the reactor shell (1). An exhaust interface is provided on one side of the exhaust port (41) outside the reactor shell (1). The exhaust interface is connected to the air purification equipment through an exhaust pipe.

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