Low pressure coal bed gas mdea deacidification device

Abstract

This invention relates to the field of coalbed methane purification technology and provides a low-pressure coalbed methane MDEA desulfurization device, comprising: a tower body, with a feed pipe 1 and a feed pipe 2 respectively installed at the top and bottom of the tower body; a gas-liquid distribution mechanism located in the middle of the tower body, the gas-liquid distribution mechanism including a primary desulfurization component and a secondary desulfurization component, with the primary desulfurization component located below the secondary desulfurization component, and the primary and secondary desulfurization components working together through an adjustable flow guiding component; and a secondary dispersion unit, which is used to guide the gas processed by the primary desulfurization component to the working area of ​​the secondary desulfurization component. This invention, through the coordinated arrangement of the gas-liquid distribution mechanism and the secondary dispersion unit, avoids the problem of uneven gas-liquid distribution that easily occurs in existing desulfurization devices when applied to low-pressure coalbed methane, which leads to insufficient contact between the coalbed methane and the MDEA solution and affects the desulfurization effect.

Description

Technical Field

[0001] This invention relates to the field of coalbed methane purification technology, specifically a low-pressure coalbed methane MDEA deacidification device. Background Technology

[0002] Coalbed methane (CBM) is an important clean energy source, primarily composed of methane, but it typically contains certain amounts of acidic gases such as carbon dioxide (CO2) and hydrogen sulfide (H2S). The presence of these acidic gases not only reduces the calorific value of CBM but also corrodes pipelines and equipment, necessitating deacidification treatment. The MDEA method, due to its advantages of high selective absorption of H2S, low energy consumption, and minimal solvent degradation, is widely used in CBM deacidification processes.

[0003] Existing desulfurization devices often suffer from uneven gas-liquid distribution when applied to low-pressure coalbed methane, resulting in insufficient contact between the coalbed methane and the MDEA solution and affecting desulfurization efficiency. Therefore, there is an urgent need to provide a low-pressure coalbed methane MDEA desulfurization device to overcome the shortcomings in current practical applications. Summary of the Invention

[0004] The purpose of this invention is to provide a low-pressure coalbed methane MDEA deacidification device, which aims to solve the problems mentioned in the background art.

[0005] This invention is implemented as follows: a low-pressure coalbed methane MDEA deacidification device, comprising:

[0006] The tower body is provided with a first material guide pipe and a second material guide pipe at its top and bottom, respectively. The first material guide pipe includes an air outlet pipe and a liquid inlet pipe, and the second material guide pipe includes an air inlet pipe and a liquid outlet pipe.

[0007] The gas-liquid distribution mechanism located in the middle of the tower body includes a primary acid removal component and a secondary acid removal component, with the primary acid removal component located below the secondary acid removal component. The primary acid removal component and the secondary acid removal component work together through an adjustable flow guiding component.

[0008] And a secondary dispersion unit, which is used to guide the gas processed by the primary deacidification component to the working area of ​​the secondary deacidification component.

[0009] As a further aspect of the present invention: the primary deacidification component includes:

[0010] A rotating shaft is mounted at the bottom of the tower body, and a motor for driving the rotating shaft is configured at the bottom of the tower body;

[0011] A guide cover is fixedly installed inside the tower body, and a flow guide cover that is connected to each other is fixedly installed on the guide cover;

[0012] A dispersing cone is located inside a guide shroud, the dispersing cone is fixedly mounted on a rotating shaft, and there is a gap between the inner wall of the guide shroud and the surface of the dispersing cone for gas-liquid flow.

[0013] And a reverse flow guide groove is formed on the surface of the dispersion cone. The reverse flow guide groove has an arc-shaped structure, and the concave surface of the reverse flow guide groove faces the rotation direction of the dispersion cone. The rotating shaft drives the dispersion cone to rotate so that the liquid flowing downward along the surface of the dispersion cone can flow upward in the reverse direction under the action of the reverse flow guide groove, thereby prolonging the gas-liquid contact time.

[0014] As a further aspect of the present invention: multiple sets of the reverse flow guide channels are provided, and the openings at both ends of the reverse flow guide channels reach the upper and lower ends of the dispersion cone.

[0015] As a further aspect of the present invention: both the guide cover and the drainage cover are horn-shaped structures, and the small openings of the guide cover and the drainage cover are interconnected.

[0016] As a further aspect of the present invention: the surface of the dispersion cone is further provided with an auxiliary delay component, and the auxiliary delay component includes:

[0017] A retaining ring is provided in multiple sets at intervals on the surface of the dispersion cone, and the retaining ring is slidably engaged with the guide cover;

[0018] And a stop bar fixed on the stop ring, the stop bar being inclined, and the included angle between the stop bar and the stop ring being an acute angle.

[0019] As a further aspect of the present invention: a dispersion hood and a guide vane are also fixedly installed on the rotating shaft. The dispersion hood is located above the connection between the guide hood and the flow guide hood, and the guide vane is located below the dispersion hood. The dispersion hood is also provided with multiple sets of strip-shaped through holes, and the cross-section of the strip-shaped through holes is a trapezoidal structure. The opening size of the strip-shaped through holes facing the guide vane is smaller than the opening size of the strip-shaped through holes away from the guide vane. When the guide vane rotates with the rotating shaft, it drives the airflow to move towards the dispersion hood.

[0020] As a further aspect of the present invention: the secondary deacidification component includes:

[0021] The desulfurization cylinder is fixedly installed inside the tower body, and a circular hole is provided at the bottom of the desulfurization cylinder for the rotating shaft to pass through.

[0022] The stirring blades are located inside the desulfurization cylinder, and multiple sets of the stirring blades are fixedly installed on the rotating shaft.

[0023] As a further aspect of the present invention: when the stirring blades rotate with the rotating shaft, the stirring blades will generate a downward thrust on the liquid in the desulfurization cylinder, and the magnitude of the thrust is directly proportional to the rotational speed of the stirring blades.

[0024] As a further aspect of the present invention: the adjustable flow guiding component includes:

[0025] A guide pipe is fixedly installed at the bottom of the desulfurization cylinder, and a guide hole communicating with the desulfurization cylinder is opened inside the guide pipe. The guide hole has a trumpet-shaped structure, and the side of the guide hole near the desulfurization cylinder has a small opening.

[0026] The telescopic rod is slidably installed inside the guide pipe, and a discharge hole communicating with the guide hole is opened inside the telescopic rod;

[0027] A plugging block for controlling the flow rate of the guide hole, the plugging block being fixedly installed on the telescopic rod;

[0028] The dispersion block is fixedly installed at the bottom of the telescopic rod, and the dispersion block has a cavity that communicates with the telescopic rod. Several spray holes are opened at the bottom of the dispersion block.

[0029] And a spring fitted on the guide pipe and the telescopic rod, one end of the spring being fixedly connected to the bottom of the desulfurization cylinder and the other end of the spring being fixedly connected to the top of the dispersion block.

[0030] As a further aspect of the present invention: the secondary dispersion unit includes:

[0031] A dispersing frame located inside the desulfurization cylinder is fixedly installed on a rotating shaft and has several spray holes. The dispersing frame has an inner cavity that communicates with the spray holes.

[0032] A flow guide hood is fixedly installed inside the desulfurization cylinder. The flow guide hood is rotatably connected to the dispersion frame, and a sealed cavity is formed between the flow guide hood and the dispersion frame. The sealed cavity is connected to the inner cavity of the dispersion frame.

[0033] A connecting hole is provided on the side wall of the desulfurization cylinder, and the connecting hole is connected to a sealed cavity;

[0034] The conduit is connected at one end to a connecting hole and at the other end between a drainage hood and a dispersing block. A delivery pump is also provided on the conduit.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] First, the gas-liquid contact mode has been completely revolutionized, achieving multi-stage deep desulfurization. Traditional devices often suffer from low desulfurization efficiency due to uneven gas-liquid distribution, while this device constructs a three-dimensional treatment process of "primary deacidification, secondary dispersion, and secondary deacidification." The coalbed methane to be treated enters from the bottom and undergoes preliminary purification in the primary deacidification component. Subsequently, a unique secondary dispersion unit uses a delivery pump and conduit to precisely extract the gas after primary treatment and reinject it into the core area of ​​the secondary deacidification component. In the secondary component, a rotating dispersion rack atomizes and sprays the gas evenly through nozzles, creating a strong "countercurrent" effect with the MDEA solution flowing from top to bottom. This forced countercurrent contact mechanism greatly increases the turbulence and effective contact area of ​​the gas and liquid phases, ensuring that acidic gases are fully absorbed by the MDEA solution, thereby significantly improving the purification purity of the final gas.

[0037] Secondly, the unique reverse flow guidance and delay mechanism significantly extends the reaction residence time. In the first-stage desulfurization unit, the motor drives the dispersion cone to rotate at high speed. The arc-shaped reverse flow guidance groove designed on its surface, combined with the inclined baffles and baffle rings, constitutes an ingenious fluid dynamic structure. When the liquid flows downward along the surface of the cone, under the combined action of centrifugal force and the geometry of the flow guidance groove, some of the liquid is forced to flow upward in the reverse direction. This complex flow pattern of "liquid upward, gas upward but at different speeds" or "liquid local reverse flow" effectively breaks the rapid passage mode under conventional gravity flow and forcibly extends the convergence time and path length of the gas and liquid phases in the reaction zone. The longer contact time means a more complete chemical reaction, which directly improves the desulfurization efficiency of the single-stage tower, especially suitable for difficult-to-handle conditions such as low-pressure coalbed methane.

[0038] Third, it possesses excellent adaptive flow regulation capabilities, ensuring efficient operation under a wide range of working conditions. Addressing the large airflow fluctuations during coalbed methane extraction, this device is designed with an automatic feedback regulation system based on hydrodynamics. When the intake air volume increases, the system enhances the downward thrust of the stirring blades on the liquid by increasing the shaft speed. This increased thrust pushes the sealing block in the guide pipe downwards, compressing the spring and opening a larger liquid flow cross-section, thereby automatically increasing the spray volume of MDEA solution. This "gas-liquid ratio increase" linkage mechanism dynamically maintains the optimal gas-liquid ratio without the need for complex external sensors and control circuits, preventing flooding or poor contact caused by sudden increases in gas volume, and ensuring stable and efficient operation of the device under different loads.

[0039] In addition, intelligent liquid level management and anti-backflow design ensure the long-term stability of the system; the built-in liquid level sensor monitors the MDEA solution status in the tower in real time. Once the solution reaches saturation or the preset waste liquid height is detected, the liquid discharge procedure is triggered immediately to ensure that the tower is always in a highly active absorbent environment, thus eliminating the desulfurization quality decline caused by solution failure from the source; at the same time, all key flow channels are equipped with one-way valves, which completely eliminates the risk of medium backflow during shutdown or pressure fluctuations, protects internal precision components, and extends the service life of the equipment;

[0040] In summary, this device, through the deep integration of mechanical structure and fluid control, not only solves the industry problem of uneven gas-liquid distribution, but also achieves efficient, stable, and deep deacidification of low-pressure coalbed methane by extending contact time, adaptive adjustment, and multi-stage enhanced treatment, thus demonstrating significant industrial application value. Attached Figure Description

[0041] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of the present invention.

[0043] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0044] Figure 3 for Figure 2 A bottom view.

[0045] Figure 4 This is a schematic diagram of the gas-liquid distribution mechanism in this invention.

[0046] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0047] Figure 6 for Figure 4 Floor plan.

[0048] Figure 7 This is a schematic diagram of the auxiliary delay component in this invention.

[0049] Figure 8 This is a schematic diagram of the internal structure of the guide tube in this invention.

[0050] In the attached diagram: 1-Tower body, 2-Feed guide pipe one, 3-Transfer pump, 4-Feed guide pipe two, 5-Motor, 6-Rotating shaft, 7-Guide cover, 8-Flow guide cover, 9-Dispersion block, 10-Desulfurization cylinder, 11-Agitator blade, 12-Conduit, 13-Dispersion cone, 14-Flow guide cover, 15-Dispersion frame, 16-Flow guide pipe, 17-Spring, 18-Telescopic rod, 19-Support rod, 20-Dispersion cover, 21-Reverse flow guide channel, 22-Baffle ring, 23-Spray hole, 24-Strip through hole, 25-Flow guide blade, 26-Baffle strip, 27-Discharge hole, 28-Blocking block, 29-Flow guide hole, 30-Connecting hole. Detailed Implementation

[0051] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0052] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] The present invention will be further explained below with reference to specific embodiments.

[0055] Please see Figures 1-8 The present invention provides a low-pressure coalbed methane MDEA deacidification device, comprising:

[0056] The tower body 1 is provided with a first material guide pipe 2 and a second material guide pipe 4 at its top and bottom, respectively. The first material guide pipe 2 includes an air outlet pipe and a liquid inlet pipe, and the second material guide pipe 4 includes an air inlet pipe and a liquid outlet pipe.

[0057] The gas-liquid distribution mechanism located in the middle of the tower body 1 includes a primary acid removal component and a secondary acid removal component, with the primary acid removal component located below the secondary acid removal component. The primary acid removal component and the secondary acid removal component work together through an adjustable flow guiding component.

[0058] And a secondary dispersion unit, which is used to guide the gas processed by the primary deacidification component to the working area of ​​the secondary deacidification component.

[0059] In an embodiment of the present invention, a liquid level sensor is also installed inside the tower body 1 to detect the liquid level of the MDEA solution. When the MDEA solution remaining in the tower body 1 reaches a preset liquid level, the used MDEA solution is discharged through the drain pipe, which facilitates the improvement of desulfurization quality. During operation, the MDEA solution enters the tower body 1 through the inlet pipe at the top of the tower body 1 and enters the working area of ​​the primary desulfurization component, and then enters the working area of ​​the secondary desulfurization component. The coalbed methane to be treated enters through the inlet pipe at the bottom of the tower body 1 and completes the first desulfurization process by the primary desulfurization component. The gas after the first desulfurization enters the secondary desulfurization component through the secondary dispersion unit, and the gas after the second desulfurization is discharged through the outlet pipe at the top of the tower body 1. Compared with the prior art, the present invention avoids the problem of uneven gas-liquid distribution when the existing desulfurization device is applied to low-pressure coalbed methane, which leads to insufficient contact between the coalbed methane and the MDEA solution and affects the desulfurization effect, by coordinating the gas-liquid distribution mechanism and the secondary dispersion unit.

[0060] In one embodiment of the present invention, please refer to Figures 1-8 The primary deacidification component includes:

[0061] A rotating shaft 6 is rotatably installed at the bottom of the tower body 1, and a motor 5 for driving the rotating shaft 6 to rotate is provided at the bottom of the tower body 1;

[0062] Guide cover 7, the guide cover 7 is fixedly installed inside the tower body 1, and the guide cover 7 is fixedly installed with interconnected diversion covers 8;

[0063] The dispersion cone 13 is located inside the guide cover 7. The dispersion cone 13 is fixedly installed on the rotating shaft 6, and there is a gap between the inner wall of the guide cover 7 and the surface of the dispersion cone 13 for gas-liquid flow.

[0064] And a reverse flow guide groove 21 is formed on the surface of the dispersion cone 13. The reverse flow guide groove 21 has an arc-shaped structure, and the concave surface of the reverse flow guide groove 21 faces the rotation direction of the dispersion cone 13. The rotating shaft 6 drives the dispersion cone 13 to rotate so that the liquid flowing downward along the surface of the dispersion cone 13 can flow upward in the reverse direction under the action of the reverse flow guide groove 21, so as to prolong the contact time of gas and liquid.

[0065] Multiple sets of the reverse flow guide channel 21 are provided, and the openings at both ends of the reverse flow guide channel 21 reach the upper and lower ends of the dispersion cone 13.

[0066] Both the guide cover 7 and the drainage cover 8 are funnel-shaped structures, and the small openings of the guide cover 7 and the drainage cover 8 are connected to each other.

[0067] The surface of the dispersion cone 13 is further provided with an auxiliary delay component, and the auxiliary delay component includes:

[0068] A retaining ring 22 is provided in multiple sets on the surface of the dispersion cone 13, and the retaining ring 22 is slidably engaged with the guide cover 7;

[0069] and a baffle 26 fixed on the baffle ring 22, the baffle 26 being inclined and the included angle between the baffle 26 and the baffle ring 22 being an acute angle;

[0070] A dispersion cover 20 and a guide vane 25 are also fixedly installed on the rotating shaft 6. The dispersion cover 20 is located above the connection between the guide cover 7 and the guide cover 8, and the guide vane 25 is located below the dispersion cover 20. The dispersion cover 20 is also provided with multiple sets of strip-shaped through holes 24, and the cross-section of the strip-shaped through holes 24 is a trapezoidal structure. The opening size of the strip-shaped through holes 24 facing the guide vane 25 is smaller than the opening size of the strip-shaped through holes 24 away from the guide vane 25. When the guide vane 25 rotates with the rotating shaft 6, it drives the airflow to move towards the dispersion cover 20.

[0071] The secondary deacidification component includes:

[0072] The desulfurization cylinder 10 is fixedly installed inside the tower body 1, and the bottom of the desulfurization cylinder 10 is provided with a circular hole for the rotating shaft 6 to pass through; wherein, the circular hole and the rotating shaft 6 are sealed.

[0073] The stirring blades 11 are located inside the desulfurization cylinder 10, and multiple sets of the stirring blades 11 are fixedly installed on the rotating shaft 6;

[0074] When the stirring blade 11 rotates with the rotating shaft 6, the stirring blade 11 will generate a downward thrust on the liquid in the desulfurization cylinder 10, and the magnitude of the thrust is directly proportional to the rotation speed of the stirring blade 11.

[0075] The adjustable flow guiding component includes:

[0076] The guide pipe 16 is fixedly installed at the bottom of the desulfurization cylinder 10, and the guide pipe 16 has a guide hole 29 connected to the desulfurization cylinder 10. The guide hole 29 has a trumpet-shaped structure, and the side of the guide hole 29 closest to the desulfurization cylinder 10 has a small opening.

[0077] Telescopic rod 18, which is slidably installed inside the guide pipe 16, and the telescopic rod 18 has a discharge hole 27 that communicates with the guide hole 29.

[0078] A blocking block 28 is used to control the flow rate of the guide hole 29, and the blocking block 28 is fixedly installed on the telescopic rod 18;

[0079] The dispersing block 9 is fixedly installed at the bottom of the telescopic rod 18, and the dispersing block 9 has a cavity that communicates with the telescopic rod 18. Several spray holes 23 are opened at the bottom of the dispersing block 9. Several support rods 19 are also fixedly installed between the diversion hood 8 and the dispersing block 9.

[0080] And a spring 17 fitted on the guide pipe 16 and the telescopic rod 18, one end of the spring 17 being fixedly connected to the bottom of the desulfurization cylinder 10, and the other end of the spring 17 being fixedly connected to the top of the dispersion block 9.

[0081] In this embodiment, the motor 5 drives the rotating shaft 6 to rotate, which in turn drives the stirring blades 11, the dispersion hood 20, the guide blades 25, and the dispersion cone 13 to rotate simultaneously. When the gas flow rate entering the tower body 1 increases, the rotation speed of the rotating shaft 6 can be increased, which increases the thrust of the stirring blades 11 on the liquid in the desulfurization cylinder 10, thereby increasing the liquid flow rate entering the guide pipe 16. This pushes the sealing block 28 downward, stretches the spring 17, and the liquid enters the dispersion block 9 through the discharge hole 27. It is then sprayed onto the guide hood 8 through the spray hole 23 at the bottom of the dispersion block 9. The liquid is guided by the guide hood 8 into the gap between the guide hood 7 and the dispersion cone 13, so that the gas flowing through the gap can fully contact the liquid, improving efficiency. The high desulfurization effect is achieved by using a dispersion cone 13 that, during rotation, allows some liquid in the gaps to flow in the opposite direction through the coordinated arrangement of the reverse guide channel 21, baffle ring 22, and baffle strip 26. This prolongs the liquid-gas interface time and further improves the desulfurization effect. The rotating guide vane 25 drives the gas to flow upward. When the gas passes through the strip-shaped through hole 24, it can fully contact the liquid flowing over the surface of the dispersion hood 20, achieving desulfurization again. The secondary dispersion unit can guide the gas after primary desulfurization into the desulfurization cylinder 10 and allow it to fully contact the liquid inside the desulfurization cylinder 10 again, completing the desulfurization operation. One-way valves are installed in the perforated structures used for gas and liquid flow to prevent backflow.

[0082] In one embodiment of the present invention, please refer to Figures 1-8The secondary dispersion unit includes:

[0083] The dispersion frame 15 is located inside the desulfurization cylinder 10. The dispersion frame 15 is fixedly installed on the rotating shaft 6, and the dispersion frame 15 has a plurality of spray holes 23. The dispersion frame 15 has an inner cavity that communicates with the spray holes 23.

[0084] A flow guide hood 14 is fixedly installed inside the desulfurization cylinder 10. The flow guide hood 14 is rotatably connected to the dispersion frame 15, and a sealed cavity is formed between the flow guide hood 14 and the dispersion frame 15. The sealed cavity is connected to the inner cavity of the dispersion frame 15.

[0085] A connecting hole 30 is provided on the side wall of the desulfurization cylinder 10, and the connecting hole 30 is connected to the sealed cavity;

[0086] And a conduit 12, one end of which is connected to a connecting hole 30, and the other end of which is located between a drainage hood 8 and a dispersing block 9, and a delivery pump 3 is also provided on the conduit 12.

[0087] In this embodiment, by using the combination of the delivery pump 3 and the conduit 12, the gas after the first desulfurization can be drawn into the guide shroud 14. The gas enters the inner cavity of the dispersion rack 15 and is sprayed out through the nozzle 23. As the dispersion rack 15 rotates with the rotating shaft 6, the gas can be evenly dispersed into the desulfurization cylinder 10 and flushed against the downward flowing liquid, further improving the desulfurization effect.

[0088] In summary, the working principle of this invention is as follows:

[0089] During operation, the MDEA solution enters tower 1 through the inlet pipe at the top of tower 1 and flows into the working area of ​​the primary desulfurization unit. From there, it flows into the working area of ​​the secondary desulfurization unit. The coalbed methane to be treated enters through the inlet pipe at the bottom of tower 1 and undergoes primary desulfurization by the primary desulfurization unit. The desulfurized gas then passes through a secondary dispersion unit into the secondary desulfurization unit. After secondary desulfurization, the gas exits through the outlet pipe at the top of tower 1. A level sensor detects the MDEA solution level. When the MDEA solution remaining in tower 1 reaches the preset level, the used MDEA solution is discharged through the drain pipe. The specific operating steps of the primary and secondary desulfurization units are as follows:

[0090] Motor 5 drives shaft 6 to rotate, simultaneously rotating stirring blades 11, dispersion hood 20, guide vanes 25, and dispersion cone 13. As the gas flow rate into tower 1 increases, the rotational speed of shaft 6 increases, increasing the thrust of stirring blades 11 on the liquid in desulfurization cylinder 10. This increases the liquid flow rate into guide pipe 16, pushing sealing block 28 downwards. Spring 17 is stretched, and liquid enters dispersion block 9 through discharge hole 27, then is sprayed onto guide hood 8 from spray hole 23 at the bottom of dispersion block 9. Liquid is guided by guide hood 8 into the gap between guide hood 7 and dispersion cone 13, allowing gas flowing through the gap to fully contact the liquid, improving desulfurization efficiency. Furthermore, dispersion cone 13 guides the flow in reverse during rotation. The coordinated arrangement of the trough 21, baffle ring 22, and baffle strip 26 allows some of the liquid in the gap to flow in the opposite direction, thereby prolonging the liquid-gas interface time and further improving the desulfurization effect. The rotating guide vane 25 will drive the gas to flow upward. When the gas passes through the strip-shaped through hole 24, it can fully contact the liquid flowing on the surface of the dispersion hood 20, achieving the purpose of desulfurization again. With the coordinated arrangement of the delivery pump 3 and the conduit 12, the gas after the first desulfurization can be drawn into the guide hood 14. The gas enters the inner cavity of the dispersion rack 15 and is sprayed out from the nozzle 23. As the dispersion rack 15 rotates with the rotating shaft 6, it can evenly disperse the gas into the desulfurization cylinder 10 and flush it with the downward flowing liquid, further improving the desulfurization effect and completing the desulfurization operation.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-pressure coalbed methane MDEA deacidification device, comprising a tower body (1), wherein a first feed pipe (2) and a second feed pipe (4) are respectively provided at the top and bottom of the tower body (1), the first feed pipe (2) comprising an outlet pipe and a liquid inlet pipe, and the second feed pipe (4) comprising an inlet pipe and a outlet pipe, characterized in that, Also includes: The gas-liquid distribution mechanism located in the middle of the tower body (1) includes a primary deacidification component and a secondary deacidification component, with the primary deacidification component located below the secondary deacidification component. The primary deacidification component and the secondary deacidification component work together through an adjustable flow guide component. And a secondary dispersion unit, which is used to guide the gas processed by the primary deacidification component to the working area of ​​the secondary deacidification component.

2. The low-pressure coalbed methane MDEA deacidification device according to claim 1, characterized in that, The primary deacidification component includes: Rotary shaft (6) is installed at the bottom of tower body (1), and a motor (5) for driving the rotating shaft (6) to rotate is provided at the bottom of the tower body (1). Guide cover (7), the guide cover (7) is fixedly installed inside the tower body (1), and the guide cover (7) is fixedly installed with interconnected diversion covers (8); The dispersion cone (13) is located inside the guide cover (7), the dispersion cone (13) is fixedly installed on the rotating shaft (6), and there is a gap between the inner wall of the guide cover (7) and the surface of the dispersion cone (13) for gas-liquid flow. And a reverse flow guide groove (21) is opened on the surface of the dispersion cone (13). The reverse flow guide groove (21) has an arc-shaped structure, and the concave surface of the reverse flow guide groove (21) faces the rotation direction of the dispersion cone (13). The rotating shaft (6) drives the dispersion cone (13) to rotate so that the liquid flowing downward along the surface of the dispersion cone (13) can flow upward in the reverse direction under the action of the reverse flow guide groove (21) to prolong the contact time between gas and liquid.

3. The low-pressure coalbed methane MDEA deacidification device according to claim 2, characterized in that, The reverse flow channel (21) is provided in multiple sets, and the openings at both ends of the reverse flow channel (21) reach the upper and lower ends of the dispersion cone (13).

4. The low-pressure coalbed methane MDEA deacidification device according to claim 2, characterized in that, Both the guide cover (7) and the drainage cover (8) are horn-shaped structures, and the small openings of the guide cover (7) and the drainage cover (8) are connected to each other.

5. The low-pressure coalbed methane MDEA deacidification device according to claim 2, characterized in that, The surface of the dispersion cone (13) is further provided with an auxiliary delay component, and the auxiliary delay component includes: A retaining ring (22) is provided in multiple sets at intervals on the surface of the dispersion cone (13), and the retaining ring (22) slides in fit with the guide cover (7); And a baffle (26) fixed on the baffle ring (22), the baffle (26) being inclined and the included angle between the baffle (26) and the baffle ring (22) being an acute angle.

6. The low-pressure coalbed methane MDEA deacidification device according to claim 2, characterized in that, A dispersion cover (20) and a guide vane (25) are also fixedly installed on the rotating shaft (6). The dispersion cover (20) is located above the connection between the guide cover (7) and the guide cover (8), and the guide vane (25) is located below the dispersion cover (20). The dispersion cover (20) is also provided with multiple sets of strip-shaped through holes (24), and the cross-section of the strip-shaped through hole (24) is a trapezoidal structure. The opening size of the strip-shaped through hole (24) facing the guide vane (25) is smaller than the opening size of the strip-shaped through hole (24) away from the guide vane (25). When the guide vane (25) rotates with the rotating shaft (6), it drives the airflow to move towards the dispersion cover (20).

7. The low-pressure coalbed methane MDEA deacidification device according to claim 2, characterized in that, The secondary deacidification component includes: The desulfurization cylinder (10) is fixedly installed inside the tower body (1), and the bottom of the desulfurization cylinder (10) is provided with a round hole for the rotating shaft (6) to pass through; The stirring blades (11) are located inside the desulfurization cylinder (10), and multiple sets of the stirring blades (11) are fixedly installed on the rotating shaft (6).

8. The low-pressure coalbed methane MDEA deacidification device according to claim 7, characterized in that, When the stirring blade (11) rotates with the rotating shaft (6), the stirring blade (11) will generate a downward thrust on the liquid in the desulfurization cylinder (10), and the magnitude of the thrust is proportional to the rotation speed of the stirring blade (11).

9. The low-pressure coalbed methane MDEA deacidification device according to claim 7, characterized in that, The adjustable flow guiding component includes: The guide pipe (16) is fixedly installed at the bottom of the desulfurization cylinder (10), and the guide pipe (16) has a guide hole (29) connected to the desulfurization cylinder (10). The guide hole (29) is a trumpet-shaped structure, and the side of the guide hole (29) near the desulfurization cylinder (10) is a small opening. Telescopic rod (18), the telescopic rod (18) is slidably installed in the guide pipe (16), and the telescopic rod (18) has a discharge hole (27) that communicates with the guide hole (29). A plugging block (28) for controlling the flow rate of the guide hole (29), the plugging block (28) being fixedly installed on the telescopic rod (18); Dispersion block (9), the dispersion block (9) is fixedly installed at the bottom of the telescopic rod (18), and the dispersion block (9) has a cavity connected to the telescopic rod (18), and the bottom of the dispersion block (9) has a number of spray holes (23). And a spring (17) fitted on the guide pipe (16) and the telescopic rod (18), one end of the spring (17) being fixedly connected to the bottom of the desulfurization cylinder (10), and the other end of the spring (17) being fixedly connected to the top of the dispersion block (9).

10. The low-pressure coalbed methane MDEA deacidification device according to claim 7, characterized in that, The secondary dispersion unit includes: A dispersing frame (15) is located inside the desulfurization cylinder (10). The dispersing frame (15) is fixedly installed on the rotating shaft (6), and a number of spray holes (23) are opened on the dispersing frame (15). The dispersing frame (15) has an inner cavity that communicates with the spray holes (23). A flow guide hood (14) is fixedly installed inside the desulfurization cylinder (10). The flow guide hood (14) is rotatably connected to the dispersion frame (15), and a closed cavity is formed between the flow guide hood (14) and the dispersion frame (15). The closed cavity is connected to the inner cavity of the dispersion frame (15). A connecting hole (30) is provided on the side wall of the desulfurization cylinder (10), and the connecting hole (30) is connected to the sealed cavity; And a conduit (12), one end of which is connected to a connecting hole (30), the other end of which is located between a drainage hood (8) and a dispersing block (9), and a delivery pump (3) is also provided on the conduit (12).

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