Natural gas decarbonization device with low energy consumption

Abstract

The utility model relates to the technical field of natural gas purification, in particular to a low-energy-consumption natural gas decarburization device which comprises a decarburization treatment tank, a top cover is arranged at the top of the decarburization treatment tank, an absorption tower, a heating machine and a desorption machine are sequentially arranged in the decarburization treatment tank, and a liquid outlet pipe is arranged at the bottom of the absorption tower. A spiral heating pipe is arranged in the heating machine, a rich liquid distributor is arranged in the desorption machine, a liquid inlet pipe is arranged on one side of the top of the rich liquid distributor, a rotary spraying mechanism is arranged in the absorption tower, a driving mechanism is arranged on one side of the rotary spraying mechanism, the rotary spraying mechanism comprises a ring piece, a rotating pipe is arranged on the inner side of the ring piece, and a driving mechanism is arranged on one side of the rotating pipe. A fluted disc is arranged on the outer side of the rotating pipe, a supporting ring is arranged below the fluted disc, the two sides of the lower end of the rotating pipe communicate with flow dividing pipes, and a plurality of spraying heads are arranged at the bottoms of the flow dividing pipes at equal intervals; through cooperation of the structure, the purpose of efficiently removing carbon dioxide in natural gas is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of natural gas purification technology, specifically relating to a low-energy-consumption natural gas decarbonization device. Background Technology

[0002] During the oilfield extraction process, a large amount of associated gas is generated, which contains a high concentration of carbon dioxide. The natural gas quality standard requires that the carbon dioxide content not exceed 3%. High concentrations of carbon dioxide can easily cause pipeline bottlenecks and environmental emission problems. Therefore, efficient decarbonization of extracted natural gas has become the key to the rational utilization of natural gas resources.

[0003] Currently, traditional natural gas decarbonization technologies mainly include physical solvent methods, chemical solvent methods, and direct conversion methods. Among chemical solvent methods, the MDEA method uses activated MDEA solution to react with carbon dioxide, offering unique advantages such as high absorption load, fast absorption rate, low cost, and low corrosivity. However, common tower-type decarbonization processes generally suffer from drawbacks such as system complexity, large equipment size, large footprint, high energy consumption, slow mass transfer rate, and long absorption time.

[0004] The long processing time results in losses due to the evaporation of the absorbent, requiring continuous replenishment of fresh absorbent during operation; moreover, the water consumption is high, and the generated wastewater requires further treatment; now, a low-energy-consumption natural gas decarbonization device is provided to alleviate the above-mentioned problems. Summary of the Invention

[0005] This invention utilizes the combination of a rotating spray mechanism and a drive mechanism to enable the decarbonization absorbent to rotate and spray, thereby achieving the goal of efficiently removing carbon dioxide from natural gas.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A low-energy-consumption natural gas decarbonization device includes a decarbonization treatment tank with a top cover. Inside the tank, from top to bottom, are an absorption tower, a heater, and a desorber. The inner wall of the absorption tower is connected to a filter screen, and the bottom of the absorption tower has an outlet pipe. The heater contains a spiral heating tube, and the desorber contains a rich liquid distributor with an inlet pipe on one side of its top. The absorption tower contains a rotating spray mechanism with a drive mechanism on one side. The rotating spray mechanism includes a ring, with a rotating tube inside and a toothed disc outside. A support ring is located below the toothed disc. Both sides of the lower end of the rotating tube are connected to diversion pipes, and multiple spray heads are evenly spaced at the bottom of the diversion pipes.

[0008] Preferably, the absorption tower has an outlet pipe on one side of the top, an inlet pipe penetrating the side wall of the bottom, a carbon dioxide outlet penetrating the side wall of the bottom, and a regeneration lean liquid outlet on the side of the bottom of the desorber away from the carbon dioxide outlet.

[0009] Preferably, the bottom of the rich liquid distributor is provided with multiple atomizing nozzles at equal intervals, the inner wall of the desorption machine is provided with a packing disc, and a reaction component is provided between the rotary spraying mechanism and the air inlet pipe. The reaction component includes wire mesh packing, the sides of which are connected to the inner wall of the absorption tower, and corrugated regular packing is provided at the top and bottom of the wire mesh packing.

[0010] Preferably, the driving mechanism includes a gear, one side of the gear disk is connected to the gear, the upper end of the gear is provided with a rotating shaft, the upper end of the rotating shaft is provided with a motor, and one side of the motor is provided with a fixing member.

[0011] Preferably, the heater has an internal cavity, and the side wall of the heater has a heating liquid inlet and a heating liquid outlet that penetrate the side wall, with the heating liquid inlet and the heating liquid outlet being distributed relatively on the side wall.

[0012] Preferably, the inlet pipe is connected to the inlet of the spiral heating tube, the rich liquid distributor is connected to the outlet of the spiral heating tube, and an inlet pump and an outlet pump are provided on the outlet pipe.

[0013] Preferably, one end of the air inlet pipe is connected to the air outlet of the buffer tank via a pipe fitting, one end of the regenerated lean liquid outlet is connected to the inlet of the condensation circulation device via a pipe fitting, the inlet of the condensation circulation device is connected to the liquid inlet of the storage tank via a pipe fitting, and the liquid outlet of the storage tank is connected to the rotating pipe on the absorption tower via a pipe fitting.

[0014] Compared with the prior art, the gain effect of this utility model is as follows:

[0015] 1. By setting up a rotary spraying mechanism and a drive mechanism, the rotating shaft is driven by a motor to rotate, the rotating shaft drives the gear to rotate, and the gear drives the rotary spraying mechanism to rotate, thereby realizing the rotary spraying of natural gas, increasing the contact area with natural gas, improving the decarbonization efficiency of the device, and utilizing the characteristics of the rotary spraying mechanism to overcome the viscosity and surface tension of the decarbonization absorbent, dispersing the liquid into tiny liquid films, liquid filaments and droplets, thereby strengthening the mass transfer process between gas and liquid, improving the decarbonization rate, and the decarbonization agent can be repeatedly recycled; the present invention has high decarbonization efficiency, low energy consumption, low investment and operating costs, and is conducive to industrial promotion and application.

[0016] 2. By integrating the absorption tower, heater, and desorber into one unit, the large heat loss caused by traditional pipeline connections is avoided. This device is small in size, simple in structure, and easy to operate. Compared with traditional tower equipment, the process has the advantages of high decarbonization rate, low energy consumption, low investment and operating costs, and stable operation. Attached Figure Description

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0019] Figure 3 This is a partial cross-sectional view of the absorption tower according to an embodiment of the present invention;

[0020] Figure 4 This is a system diagram of an embodiment of the present utility model.

[0021] In the diagram: 1. Decarbonization treatment tank; 2. Absorption tower; 3. Heater; 4. Desorption machine; 5. Top cover; 6. Rotary spray mechanism; 601. Ring; 602. Rotating pipe; 603. Support ring; 604. Gear disc; 605. Diverter pipe; 606. Spray head; 7. Drive mechanism; 701. Fixing component; 702. Motor; 703. Rotating shaft; 704. Gear; 8. Filter screen; 9. Corrugated packing; 10. Wire mesh packing; 11. Inlet pipe; 12. Outlet pipe; 13. Spiral heating pipe; 14. Inlet pipe; 15. Inlet pump; 16. Outlet pump; 17. Heating liquid inlet; 18. Heating liquid outlet; 19. Regenerated lean liquid outlet; 20. Carbon dioxide outlet; 21. Packing disc; 22. Rich liquid distributor; 23. Atomizing nozzle; 24. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Example

[0024] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. To make the objectives, technical solutions, and advantages of this utility model clearer, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. Those skilled in the art will recognize that this utility model can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it.

[0025] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this utility model. It should also be noted in the description of this utility model that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances; any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, so as to facilitate a clearer understanding of the present invention.

[0027] Please see Figure 1-4 A low-energy-consumption natural gas decarbonization device includes a decarbonization treatment tank 1, a top cover 5 on the top of the decarbonization treatment tank 1, an absorption tower 2, a heater 3 and a desorption machine 4 fixedly arranged from top to bottom inside the decarbonization treatment tank 1, a filter screen 8 fixedly connected to the top inner wall of the absorption tower 2, an air inlet pipe 11 penetrating the bottom side wall of the absorption tower 2, a rotary spray mechanism 6 inside the absorption tower 2, a drive mechanism 7 on one side of the rotary spray mechanism 6, and a reaction component for decarbonization arranged between the rotary spray mechanism 6 and the air inlet pipe 11.

[0028] In this invention, the characteristics of the rotating spray mechanism 6 can be utilized to overcome the viscosity and surface tension of the decarbonization absorbent, dispersing the liquid into tiny liquid films, liquid filaments and droplets, thereby enhancing the mass transfer process between gas and liquid and improving the decarbonization rate. At the same time, by setting a heater 3 between the absorption tower 2 and the desorber 4, the high-temperature oil inside the cavity can be used to heat the rich liquid to a high-temperature unstable state, which facilitates the subsequent removal of carbon dioxide in the desorber 4.

[0029] Please see Figure 1-4 The rotating spray mechanism 6 includes a ring 601 that is movably connected to the top cover 5. A rotating tube 602 is fixedly installed on the inner side of the ring 601, and a support ring 603 is fixedly installed on the outer side of the rotating tube 602. The bottom of the support ring 603 is in contact with the top of the top cover 5. A toothed disc 604 is fixedly installed on the outer side of the rotating tube 602. The toothed disc 604 is located above the support ring 603. The lower end of the rotating tube 602 passes through the top of the absorption tower 2 and the filter screen 8 in sequence. Both sides of the lower end of the rotating tube 602 are fixedly connected to a diversion pipe 605. Multiple spray heads 606 are equally spaced at the bottom of the two diversion pipes 605.

[0030] Please see Figure 1-4The drive mechanism 7 includes a gear 704, which is meshed with one side of the gear disk 604. A rotating shaft 703 is fixedly mounted on the upper end of the gear 704, and a motor 702 is fixedly mounted on the upper end of the rotating shaft 703. A fixing member 701 is fixedly mounted on one side of the motor 702, and the bottom of the fixing member 701 is fixedly connected to the top of the top cover 5. In this embodiment, the rotating shaft 703 is driven to rotate by the motor 702, thereby driving the gear 704 to rotate. Since the gear 704 is meshed with the gear disk 604, the gear 704 drives the rotating spray mechanism 6 to rotate, thereby realizing the rotating spraying of natural gas, increasing the contact area with natural gas, and improving the decarbonization efficiency of the device.

[0031] Please see Figure 1-4 The reaction components include wire mesh packing 10, the sides of which are fixedly connected to the inner wall of the absorption tower 2. Corrugated and regularized packing 9 is provided at the top and bottom of the wire mesh packing 10. An outlet pipe 12 is provided on one side of the top of the absorption tower 2. The top end of the outlet pipe 12 passes through the top cover 5 and extends to the outside of the decarbonization treatment tank 1. One end of the inlet pipe 11 is connected to the outlet of the buffer tank through a pipe fitting.

[0032] Please see Figure 1-4 A liquid outlet pipe 13 is provided at the bottom of the absorption tower 2 on the side away from the inlet pipe 11. A spiral heating tube 14 is provided in the heater 3. A rich liquid distributor 23 is provided in the inner cavity of the desorption machine 4. A liquid inlet pipe 15 is provided on one side of the top of the rich liquid distributor 23. The liquid inlet pipe 15 is connected to the inlet of the spiral heating tube 14. The rich liquid distributor 23 is connected to the outlet of the spiral heating tube 14. A liquid inlet pump 16 is provided on the liquid outlet pipe 13. A liquid outlet pump 17 is provided on the liquid inlet pipe 15 to supplement the flow power of the rich liquid inside the spiral heating tube 14.

[0033] Please see Figure 1-4 The heating machine 3 has an internal cavity. The side wall of the heating machine 3 is provided with a heating liquid inlet 18 and a heating liquid outlet 19 that penetrate the side wall. The heating liquid inlet 18 and the heating liquid outlet 19 are relatively distributed on the side wall so that the heating medium entering the cavity of the heating machine 3 can fully contact the spiral heating tube 14.

[0034] Please see Figure 1-4Multiple atomizing nozzles 24 are evenly spaced at the bottom of the rich liquid distributor 23. A packing disc 22 is fixedly installed on the inner wall of the desorber 4 located below the atomizing nozzles 24. A carbon dioxide outlet 21 penetrating the side wall is provided on the bottom side wall of the desorber 4. A regenerated lean liquid outlet 20 is provided on the side of the bottom of the desorber 4 away from the carbon dioxide outlet 21, so that the regenerated lean liquid is output separately. Both the carbon dioxide outlet 21 and the regenerated lean liquid outlet 20 are located below the packing disc 22. One end of the regenerated lean liquid outlet 20 is connected to the inlet of the condensation circulation device through a pipe fitting. The inlet of the condensation circulation device is connected to the inlet of the storage tank through a pipe fitting. The outlet of the storage tank is connected to the rotating pipe 602 on the absorption tower 2 through a pipe fitting, so as to realize the recycling of the decarbonization absorbent.

[0035] Working principle: The process of natural gas decarbonization using this device is as follows:

[0036] S1. By starting the motor 702, the drive mechanism 7 drives the rotating tube 602 to rotate. The decarbonization absorbent, as a lean liquid, passes through the rotating tube 602, the diversion pipe 605 and the spray head 606 in sequence, and is sprayed onto the corrugated structured packing 9 and the wire mesh packing 10 in a rotating manner. At the same time, the associated gas in the buffer tank is transported into the absorption tower 2 through the gas inlet pipe 11. After decarbonization is completed, it is discharged from the absorption tower 2 through the liquid outlet pipe 13. The decarbonized natural gas is discharged outside the device through the gas outlet pipe 12.

[0037] S2. The lean liquor absorbs carbon dioxide in the absorption tower 2 and becomes rich liquor. The inlet pump 16 and outlet pump 17 are turned on by the controller. The rich liquor enters the spiral heating tube 14 through the outlet pipe 13 and is heated into high temperature rich liquor in the heater 3.

[0038] S3. The high-temperature rich solution flows into the rich solution distributor 23 through the inlet pipe 15, and then is sprayed onto the packing disc 22 through the atomizing nozzle 24 to remove carbon dioxide and turn it into a lean solution. It is then discharged from the desorber 4 through the regeneration lean solution outlet 20 to complete the regeneration.

[0039] S4. The regenerated lean liquid is transported to the condensation circulation device through pipes for cooling, and then flows into the storage tank for recycling.

Claims

1. A low-energy-consumption natural gas decarbonization device, characterized in that, The system includes a decarbonization treatment tank (1), which has a top cover (5). Inside the decarbonization treatment tank (1), from top to bottom, are an absorption tower (2), a heater (3), and a desorption machine (4). The inner wall of the top of the absorption tower (2) is connected to a filter screen (8). The bottom of the absorption tower (2) is provided with a liquid outlet pipe (13). The heater (3) is provided with a spiral heating tube (14). The desorption machine (4) is provided with a rich liquid distributor (23). The rich liquid distributor (23) has a liquid inlet pipe (15) on one side of its top. The absorption tower (2) is equipped with a rotating spray mechanism (6). The rotating spray mechanism (6) is equipped with a driving mechanism (7) on one side. The rotating spray mechanism (6) includes a ring (601). The inner side of the ring (601) is equipped with a rotating tube (602). The outer side of the rotating tube (602) is equipped with a toothed disc (604). The toothed disc (604) is equipped with a support ring (603) below it. Both sides of the lower end of the rotating tube (602) are connected to a diversion pipe (605). The bottom of the diversion pipe (605) is equipped with multiple spray heads (606) at equal intervals.

2. The low-energy-consumption natural gas decarbonization device according to claim 1, characterized in that, The absorption tower (2) has an outlet pipe (12) on one side of the top, and an inlet pipe (11) that penetrates the side wall of the bottom side wall of the absorption tower (2). The desorber (4) has a carbon dioxide outlet (21) that penetrates the side wall of the bottom, and a regeneration lean liquid outlet (20) is provided on the side of the bottom of the desorber (4) away from the carbon dioxide outlet (21).

3. The low-energy-consumption natural gas decarbonization device according to claim 2, characterized in that, The bottom of the rich liquid distributor (23) is provided with multiple atomizing nozzles (24) at equal intervals. The inner wall of the desorption machine (4) is provided with a packing disc (22). A reaction component is provided between the rotary spraying mechanism (6) and the air inlet pipe (11). The reaction component includes wire mesh packing (10). The side of the wire mesh packing (10) is connected to the inner wall of the absorption tower (2). The top and bottom of the wire mesh packing (10) are provided with corrugated regular packing (9).

4. The low-energy-consumption natural gas decarbonization device according to claim 1, characterized in that, The drive mechanism (7) includes a gear (704), one side of the gear disk (604) is connected to the gear (704), the upper end of the gear (704) is provided with a rotating shaft (703), the upper end of the rotating shaft (703) is provided with a motor (702), and one side of the motor (702) is provided with a fixing member (701).

5. A low-energy-consumption natural gas decarbonization device according to claim 1, characterized in that, The heating machine (3) has an internal cavity. The side wall of the heating machine (3) is provided with a heating liquid inlet (18) and a heating liquid outlet (19) that penetrate the side wall. The heating liquid inlet (18) and the heating liquid outlet (19) are distributed relatively on the side wall.

6. The low-energy-consumption natural gas decarbonization device according to claim 1, characterized in that, The inlet pipe (15) is connected to the inlet of the spiral heating pipe (14), the rich liquid distributor (23) is connected to the outlet of the spiral heating pipe (14), the outlet pipe (13) is equipped with an inlet pump (16), and the inlet pipe (15) is equipped with an outlet pump (17).

7. A low-energy-consumption natural gas decarbonization device according to claim 2, characterized in that, One end of the air inlet pipe (11) is connected to the air outlet of the buffer tank through a pipe fitting. One end of the regenerated lean liquid outlet (20) is connected to the inlet of the condensation circulation device through a pipe fitting. The inlet of the condensation circulation device is connected to the liquid inlet of the storage tank through a pipe fitting. The liquid outlet of the storage tank is connected to the rotating pipe (602) on the absorption tower (2) through a pipe fitting.

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