A membrane absorption method seawater desulfurization device for treating ship exhaust

Abstract

This invention relates to the technical field of membrane absorption desulfurization of ship exhaust gas, and particularly to a membrane absorption seawater desulfurization device for treating ship exhaust gas. The device includes a main frame, an exhaust pipe, and a tail gas pipe. The tail gas pipe is located below the exhaust pipe, and both the tail gas pipe and the exhaust pipe are fixed to the main frame. A tail gas mechanism and an exhaust mechanism are arranged inside the main frame. The tail gas mechanism is rotatably connected to the upper end of the tail gas pipe and communicates with the tail gas pipe. The lower end of the exhaust pipe is rotatably connected to the exhaust mechanism. Multiple membrane contact mechanisms are fixedly installed and connected to the upper end of the tail gas mechanism. This invention enables the membrane contact mechanisms to rotate around the exhaust pipe and tail gas pipe as the exhaust and tail gas mechanisms rotate. During the rotation of the membrane contact mechanisms, the airflow sloshes inside. Simultaneously, as the air guiding mechanism rotates within the membrane contact mechanism, it obstructs and deflects the upward-flowing airflow, increasing the path of gas movement within the membrane contact structure and reducing the sulfur content in the discharged gas.

Description

Technical Field

[0001] This invention relates to the technical field of membrane absorption desulfurization of ship exhaust gas, and in particular to a membrane absorption seawater desulfurization device for treating ship exhaust gas. Background Technology

[0002] Natural seawater contains a large amount of soluble salts, mainly chlorides and sulfates, and also a certain amount of soluble carbonates. It is generally alkaline, with a pH value typically between 7.5 and 8.3 and a natural alkalinity of 2.0 to 2.5 mmol / L. This gives seawater a natural acid-base buffering capacity and a strong ability to absorb and neutralize acidic gases. Utilizing this property of seawater to wash and absorb SO2 in flue gas, converting it into stable and harmless sulfates, achieves the purpose of flue gas purification. This avoids the use of artificial chemical additives, reducing costs, and also prevents secondary pollution. Seawater desulfurization uses natural seawater as an absorbent to remove SO2 from exhaust gas. For ocean-going vessels, seawater is readily available and can be used directly, representing a typical technology for the rational utilization of natural resources.

[0003] Compared with traditional absorption towers, membrane absorption processes have significant advantages, including: high membrane fiber packing density, with a specific surface area nearly an order of magnitude higher than that of absorption towers; compact structure, small footprint, suitable for use in confined spaces such as ships; simple equipment, small size, light weight, and easy installation; independent operation of gas and liquid phases, with no gas-liquid ratio limitation, providing excellent operational flexibility; and insensitivity to movement, making it suitable for environments with sea surface fluctuations.

[0004] Chinese patent CN113694696B discloses a desulfurization device and method for ship exhaust gas, including a sulfur-containing ship exhaust gas pretreatment system, a seawater pretreatment system, a membrane contactor, and a seawater post-treatment system. The outlet end of the sulfur-containing ship exhaust gas pretreatment system is connected to the shell-side inlet end of the membrane contactor, for sending the dust- and oil-removed exhaust gas into the shell side of the membrane contactor. The outlet end of the seawater pretreatment system is connected to the tube-side inlet end of the membrane contactor, for sending the pretreated seawater into the tube side of the membrane contactor. The membrane contactor is a membrane contactor filled with a polytetrafluoroethylene hollow fiber hydrophobic microporous membrane. The inlet end of the seawater post-treatment system is connected to the tube-side outlet end of the membrane contactor, for post-treating the seawater after absorbing sulfur dioxide, oxidizing sulfites into sulfates. The ship exhaust gas desulfurization device described in this invention has high integration, compact size, and high desulfurization efficiency, and can achieve efficient desulfurization of ship exhaust gas, with good application prospects. The above-mentioned related technologies have the following defects: the gas moves a short distance in the membrane contactor, the gas exchanges with seawater for a short time, and cannot fully desulfurize the gas, resulting in the exhaust gas not being completely purified. Summary of the Invention

[0005] To address the problems mentioned in the background art, the present invention provides a membrane absorption seawater desulfurization device for treating ship exhaust gas.

[0006] The present invention provides a membrane absorption seawater desulfurization device for treating ship exhaust gas, which adopts the following technical solution: it includes a main frame, an exhaust pipe and a tail gas pipe, the tail gas pipe is located below the exhaust pipe, and both the tail gas pipe and the exhaust pipe are fixed to the main frame. The main frame is provided with a tail gas mechanism and an exhaust mechanism. The tail gas mechanism is rotatably connected to the upper end of the tail gas pipe and is connected to the tail gas pipe. The lower end of the exhaust pipe is rotatably connected to the exhaust mechanism and is connected to the exhaust mechanism. Multiple membrane contact mechanisms are fixedly installed and connected to the upper end of the tail gas mechanism.

[0007] The exhaust pipe is equipped with a power rotation mechanism that controls the rotation of the exhaust mechanism. A seawater inlet mechanism is installed on the upper side of the main frame, and a seawater outlet mechanism is provided on the lower side of the main frame. The seawater inlet mechanism passes through the exhaust pipe and the exhaust mechanism. The membrane contact mechanism is connected and communicates with the seawater outlet mechanism.

[0008] An air guiding mechanism is coaxially arranged inside the membrane contact mechanism. The upper end of the air guiding mechanism rotates relative to the membrane contact mechanism, and the upper end of the air guiding mechanism is rotatably connected to and communicates with the exhaust mechanism.

[0009] Optionally, the exhaust mechanism includes an exhaust ring frame and an axis pipe. The axis pipe is installed at the axis of the exhaust ring frame, communicates with the exhaust ring frame, and is rotatably connected to and communicates with the exhaust pipe.

[0010] The power rotation mechanism controls the rotation of the shaft pipe relative to the exhaust pipe, and the air guiding mechanism is connected to the exhaust ring frame.

[0011] The exhaust gas mechanism includes an exhaust gas ring frame and an axial inlet pipe. The axial inlet pipe is installed at the axis of the exhaust gas ring frame and is connected to the exhaust gas ring frame. The axial outlet pipe is rotatably connected to and communicates with the exhaust gas pipe.

[0012] Optionally, the power rotation mechanism includes two winding wheels and a winding cloth. Two winding wheels are fixed at each end of the winding cloth. One of the two winding wheels is coaxially mounted with the shaft pipe, and the other winding wheel is rotatably connected to the exhaust pipe. Meshing gears are coaxially mounted on the upper ends of both winding wheels. A power gear is provided between the two meshing gears. A movable ring frame that can be powered to move is slidably sleeved on the outside of the exhaust pipe. The movable ring frame is rotatably connected to the power gear, and the power gear can rotate relative to the movable ring frame.

[0013] Optionally, the membrane contact mechanism includes a housing and a membrane tube. The membrane tube is coaxially mounted inside the housing. The lower end of the housing is fixed to the exhaust gas ring frame. The inside of the exhaust gas ring frame is connected to the inside of the membrane tube. The outside of the housing is connected to the seawater outflow mechanism and the seawater inflow mechanism, respectively. Both the seawater inflow mechanism and the seawater outflow mechanism are connected to the space between the housing and the membrane tube.

[0014] The air guiding mechanism is coaxially located inside the membrane tube.

[0015] Optionally, the air guiding mechanism includes a connecting pipe and an inner shaft. The inner shaft is coaxially located inside the connecting pipe. The upper end of the inner shaft is coaxially fixed to the inner wall of the connecting pipe. The lower end of the connecting pipe is rotatably connected to the upper end of the outer shell. The upper end of the connecting pipe is rotatably connected to the exhaust ring frame. A transmission gear is coaxially installed on the outer side of the connecting pipe.

[0016] An internal gear ring is coaxially arranged on the outer side of the exhaust ring frame. The internal gear ring is fixed to the main frame, and the transmission gear meshes with the inner ring surface of the internal gear ring.

[0017] The inner shaft is located at one end inside the membrane tube and has multiple guide components that can be deployed and retracted.

[0018] Optionally, the guide includes an elastic cone, the lower end of which is coaxially mounted with the inner shaft, the inner wall of which is connected to the outer surface of the inner shaft by a tension spring, a plurality of rigid rods fixed on the outer ring of the elastic cone, an air deflector plate rotatably connected to the outer side of the rigid rods, the end of the air deflector plate away from the rigid rods being elastically connected to the elastic cone by an elastic rope, and a gravity ball installed at the upper end of the rigid rods.

[0019] The lower end of the elastic cone is the smaller diameter end.

[0020] Optionally, the seawater outflow mechanism includes a collar and a follower water storage ring. The follower water storage ring is rotatably inserted into the inner side of the collar, and a seawater outflow pipe is inserted and installed on the outer side of the collar. The side of the outer shell away from the axis of the axial pipe is fixed to the inner ring surface of the follower water storage ring.

[0021] Optionally, the seawater inlet mechanism includes a seawater inlet pipe and a connecting head, with the lower end of the seawater inlet pipe rotatably inserted into the upper surface of the connecting head, and the outer surface of the outer shell fixed to and connected to the connecting head.

[0022] The upper end of the seawater inlet pipe passes through the exhaust ring frame and the exhaust pipe.

[0023] In summary, the present invention has the following beneficial technical effects:

[0024] This invention, through the coordinated arrangement of components such as a membrane contact mechanism and a gas guiding mechanism, allows exhaust gas to enter the inner side of the membrane contact mechanism from its lower end, while simultaneously filling the membrane contact structure with seawater. As the exhaust and exhaust gas mechanisms rotate, they drive the membrane contact mechanism to rotate around the exhaust and exhaust pipes. The rotation of the membrane contact mechanism causes the airflow to sway internally. Meanwhile, as the gas guiding mechanism rotates within the membrane contact mechanism, it obstructs and deflects the upward-flowing airflow, increasing the path of gas movement within the membrane contact structure and reducing the sulfur content in the discharged gas.

[0025] This invention incorporates components such as an elastic cone, a deflector plate, a gravity ball, and a winding cloth. The winding cloth has a certain thickness, and as the number of turns of the winding cloth around the surface of the winding wheel increases, the outer diameter gradually increases, thus gradually changing the rotational speed of the winding wheel. This causes the exhaust ring frame and the tail gas ring frame to rotate at variable speeds. Simultaneously, as the outer shell rotates around the exhaust ring frame, the inner shaft rotates relative to the membrane cylinder. As the gravity ball gradually moves away from the inner shaft during rotation, the rigid rod gradually pulls the upper side of the elastic cone away from the inner shaft, causing it to unfold. The unfolded elastic cone blocks the upward-flowing gas, causing the airflow to tend to flow towards the inner wall of the membrane cylinder. At the same time, as the rigid rod follows the rotation of the elastic cone and the inner shaft, it drives the deflector plate to rotate. Under the airflow resistance, the deflector plate gradually moves away from the outer wall of the elastic cone. The unfolded deflector plate deflects the airflow during rotation. Overall, this causes the tail gas to rotate laterally and move upward within the membrane cylinder, increasing the trajectory of the tail gas within the membrane cylinder and reducing the sulfur content in the discharged gas. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure inside the main frame in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the connection between the collar and the follower water storage ring in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the connection between the exhaust pipe and the exhaust ring frame in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the distribution of the winding cloth in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the connection between the seawater inlet pipe and the axial pipe in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the internal structure of the outer shell in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the connection between the tension spring and the elastic cone in an embodiment of the present invention;

[0034] Figure 9 This is a process flow diagram of the seawater desulfurization process using the ship exhaust gas membrane absorption method in an embodiment of the present invention.

[0035] Reference numerals: 1. Main frame; 2. Exhaust pipe; 3. Air guiding mechanism; 31. Connecting pipe; 32. Inner shaft; 33. Transmission gear; 34. Internal gear ring; 35. Guide component; 351. Elastic cone; 352. Rigid rod; 353. Gravity ball; 354. Tension spring; 355. Air deflector; 356. Elastic rope; 4. Exhaust mechanism; 41. Exhaust ring frame; 42. Axis inlet pipe; 5. Exhaust mechanism; 51. Exhaust ring 52. Frame; 6. Axis pipe; 7. Membrane contact mechanism; 8. Outer shell; 9. Membrane tube; 10. Power rotation mechanism; 11. Winding wheel; 12. Winding cloth; 13. Meshing gear; 14. Power gear; 15. Moving ring frame; 16. Seawater outflow mechanism; 17. Collar ring; 18. Follow-up water storage ring; 19. Seawater outflow pipe; 20. Seawater inflow mechanism; 10. Connecting head; 11. Exhaust pipe. Detailed Implementation

[0036] The following is in conjunction with the appendix Figures 1-9 The present invention will be described in further detail below.

[0037] This invention discloses a membrane absorption seawater desulfurization device for treating ship exhaust gas. For example... Figures 1-9 As shown, it includes a main frame 1, an exhaust pipe 2 and a tail gas pipe 10. The tail gas pipe 10 is located below the exhaust pipe 2. The tail gas pipe 10 is connected to the equipment that stores sulfur-containing tail gas. The tail gas is pretreated by dust removal, oil removal and other processes, and then enters the tail gas pipe 10 through a flow meter and a heat exchanger. Both the tail gas pipe 10 and the exhaust pipe 2 are fixed to the main frame 1.

[0038] The main frame 1 is equipped with an exhaust gas mechanism 4 and an exhaust mechanism 5. The exhaust gas mechanism 4 is rotatably connected to the upper end of the exhaust pipe 10 and is connected to the exhaust pipe 10. The lower end of the exhaust pipe 2 is rotatably connected to the exhaust mechanism 5 and is connected to the exhaust mechanism 5.

[0039] The exhaust mechanism 5 includes an exhaust ring frame 51 and an axis pipe 52. The axis pipe 52 is installed at the axis of the exhaust ring frame 51 and is connected to the exhaust ring frame 51. The axis pipe 52 is rotatably connected to and connected to the exhaust pipe 2.

[0040] Multiple membrane contact mechanisms 6 are fixed and connected to the upper end of the exhaust gas mechanism 4. The membrane contact mechanism 6 is divided into a seawater flow chamber and an exhaust gas flow chamber, which are separated by a fiber microporous membrane.

[0041] The exhaust gas mechanism 4 includes an exhaust gas ring frame 41 and an axial inlet pipe 42. The axial inlet pipe 42 is installed at the axis of the exhaust gas ring frame 41 and is connected to the exhaust gas ring frame 51. The axial outlet pipe 52 is rotatably connected to and communicates with the exhaust gas pipe 10.

[0042] The exhaust pipe 2 is equipped with a power rotation mechanism 7 that controls the rotation of the exhaust mechanism 5.

[0043] The power rotation mechanism 7 controls the rotation of the shaft pipe 52 relative to the exhaust pipe 2.

[0044] The power rotation mechanism 7 includes two winding wheels 71 and a winding cloth 72. Two winding wheels 71 are fixed at both ends of the winding cloth 72. By changing the winding cloth 72 with different thicknesses, the rotation speed of the driven winding wheel 71 is changed during the rotation of the winding wheels 71. One of the two winding wheels 71 is coaxially mounted with the shaft pipe 52, and the other winding wheel 71 is rotatably connected to the exhaust pipe 2. Meshing gears 73 are coaxially mounted on the upper ends of both winding wheels 71. A power gear 74 is provided between the two meshing gears 73. A movable ring frame 75 that can be powered to move is slidably sleeved on the outside of the exhaust pipe 2. The movable ring frame 75 is rotatably connected to the power gear 74, and the power gear 74 can rotate relative to the movable ring frame 75.

[0045] In this embodiment, a hydraulic cylinder is installed on the outside of the exhaust pipe 2 to control the movement of the movable ring frame 75. The movable ring frame 75 is equipped with a motor to control the rotation of the power gear 74. When the meshing gear 73 corresponding to the winding wheel 71 connected to the shaft pipe 52 meshes with the power gear 74, the power gear 74 drives the shaft pipe 52 to rotate at the same speed. At the same time, the winding cloth 72 is wound around the surface of the actively rotating winding wheel 71. When the power gear 74 and another winding wheel 71 rotate, the winding wheel 71 pulls the winding cloth 72 out from the outside of the winding wheel 71 connected to the shaft pipe 52 by winding the winding cloth 72. As the outer diameter of the winding cloth on the surface of the winding wheel 71 gradually decreases, the rotation speed of the shaft pipe 52 gradually increases, so that the shaft pipe 52 rotates at the same speed for a period of time, and then rotates at a different speed.

[0046] A seawater inlet mechanism 9 is installed on the upper side of the main frame 1, and a seawater outlet mechanism 8 is installed on the lower side of the main frame 1. The seawater inlet mechanism 9 passes through the exhaust pipe 2 and the exhaust mechanism 5. The membrane contact mechanism 6 is connected to and communicates with the seawater outlet mechanism 8.

[0047] The membrane contact mechanism 6 includes a housing 61 and a membrane tube 62. The membrane tube 62 uses the most advanced polytetrafluoroethylene (PTFE) hollow fiber microporous membrane. PTFE material is known as the king of plastics. It is a high molecular compound formed by the polymerization of tetrafluoroethylene and has excellent chemical stability, corrosion resistance and hydrophobicity. It is an ideal membrane material for membrane contactor technology.

[0048] The hydrophobic hollow fiber microporous PTFE membrane used in the membrane tube 62 in this embodiment has the following specifications: outer diameter 1.0 / 1.6 mm, inner diameter 0.4 / 0.8 mm, average pore size 0.2~0.5 μm, porosity 40~55%, gas flux >30000 GPU; outer shell 61: UPVC or ABS, Φ266.7 mm × 1000 mm, effective membrane area of ​​a single module 40~50 m2; operating conditions: room temperature ~ 70°C, atmospheric pressure ~ 0.5 bar, pH tolerance range 1~13, oil removal treatment for feed gas.

[0049] The required membrane module area is based on a single-stage treatment, removing SO2 content from 450 ppm to below 22.5 ppm. Based on a mass transfer flux of 2 Nm³ / h·m², the required membrane module area is approximately 300 m², equivalent to 8 membranes.

[0050] The membrane tube 62 is coaxially installed inside the outer shell 61. The lower end of the outer shell 61 is fixed to the exhaust gas ring frame 41. The inside of the exhaust gas ring frame 41 is connected to the inside of the membrane tube 62. The outside of the outer shell 61 is connected to the seawater outflow mechanism 8 and the seawater inflow mechanism 9 respectively. Both the seawater inflow mechanism 9 and the seawater outflow mechanism 8 are connected to the space between the outer shell 61 and the membrane tube 62.

[0051] In this embodiment, before the flue gas enters the membrane module, the temperature is reduced to 70°C, the oil content in the flue gas is less than 0.5 ppm, the diameter of suspended particulate matter is less than 0.01 μm, and there is no liquid water.

[0052] The seawater outflow mechanism 8 includes a collar 81 and a follower water storage ring 82. The follower water storage ring 82 is rotatably inserted into the inner side of the collar 81, and a seawater outflow pipe 83 is inserted and installed on the outer side of the collar 81. The outer shell 61 is fixed to the inner ring surface of the follower water storage ring 82 on the side away from the axis of the pipe 52.

[0053] The seawater inlet mechanism 9 includes a seawater inlet pipe 91 and a connector 92. The lower end of the seawater inlet pipe 91 is rotatably inserted into the upper surface of the connector 92, and the outer surface of the outer shell 61 is fixed and connected to the connector 92.

[0054] The upper end of the seawater inlet pipe 91 passes through the exhaust ring frame 51 and the exhaust pipe 2, and the seawater inlet pipe 91 can rotate relative to the exhaust ring frame 51.

[0055] During operation, the seawater power pump is first started to introduce the pre-treated seawater through ultrafiltration into the space between the outer shell 61 and the membrane tube 62 of the membrane contact mechanism 6 as a desulfurization absorbent.

[0056] When the space between the outer shell 61 and the membrane tube 62 of the membrane contact mechanism 6 is filled with seawater and flows out, sulfur-containing tail gas is introduced into the inside of the membrane tube 62.

[0057] Open the flue gas side valve, and after the gas is heated to the corresponding temperature by the heat exchanger, it is sent into the membrane contact mechanism 6 and flows in the opposite direction to the seawater.

[0058] During the absorption process, SO2 in the flue gas diffuses through the micropores on the PTFE membrane wall and is absorbed and removed by contact with seawater. After the flue gas meets the standards, it can be discharged into the atmosphere.

[0059] Seawater that has absorbed SO2 can be oxidized into sulfates by air and then discharged back into the ocean.

[0060] Seawater is stored in a seawater storage tank after being treated with sand and ultrafiltration. After being pumped out of the seawater storage tank by a seawater pump, the seawater is filled into the space between the outer shell 61 and the membrane cylinder 62 through a liquid regulating valve.

[0061] An air guiding mechanism 3 is coaxially arranged inside the membrane contact mechanism 6. The air guiding mechanism 3 is coaxially located inside the membrane cylinder 62. The upper end of the air guiding mechanism 3 rotates relative to the membrane contact mechanism 6. The upper end of the air guiding mechanism 3 is rotatably connected to and communicates with the exhaust mechanism 5. The air guiding mechanism 3 is connected to the exhaust ring frame 51.

[0062] The air guiding mechanism 3 includes a connecting pipe 31 and an inner shaft 32. The inner shaft 32 is coaxially located inside the connecting pipe 31. The upper end of the inner shaft 32 is coaxially fixed to the inner wall of the connecting pipe 31. The lower end of the connecting pipe 31 is rotatably connected to the upper end of the outer shell 61. The upper end of the connecting pipe 31 is rotatably connected to the exhaust ring frame 51. A transmission gear 33 is coaxially installed on the outer side of the connecting pipe 31.

[0063] An internal gear ring 34 is coaxially arranged on the outer side of the exhaust ring frame 51. The internal gear ring 34 is fixed to the main frame 1. The transmission gear 33 meshes with the inner ring surface of the internal gear ring 34. As the connecting pipe 31 rotates with the exhaust ring frame 51, it drives the transmission gear 33 to mesh with the fixed internal gear ring 34. The transmission gear 33 drives the connecting pipe 31 and the inner shaft 32 to rotate.

[0064] The inner shaft 32 is located inside the membrane tube 62 and has multiple guide elements 35 that can be deployed and retracted.

[0065] The flow guide 35 includes an elastic cone 351. The lower end of the elastic cone 351 is coaxially mounted with the inner shaft 32. The lower end of the elastic cone 351 is the small-diameter end. The inner wall of the elastic cone 351 is connected to the outer surface of the inner shaft 32 by a tension spring 354. Multiple rigid rods 352 are fixed on the outer ring surface of the elastic cone 351. A deflector plate 355 is rotatably connected to the outside of the rigid rod 352. The end of the deflector plate 355 away from the rigid rod 352 is elastically connected to the elastic cone 351 by an elastic rope 356. As the deflector plate 355 rotates with the elastic cone 351, it gradually moves away from the elastic cone 351 under the airflow. The unfolded deflector plate 355 deflects the airflow, assists in pushing the airflow to move laterally, increases the distance the gas moves in the membrane cylinder 62, and thus increases the gas desulfurization effect. A gravity ball 353 is installed at the upper end of the rigid rod 352.

[0066] As the elastic cone 351 rotates with the inner shaft 32, the rigid rod 352 drives the gravity ball 353 to rotate around the axis of the inner shaft 32. Under centrifugal force, the gravity ball 353 moves away from the inner shaft 32, pulling the elastic cone 351 to stretch the tension spring 354, causing the upper end of the elastic cone 351 to gradually unfold. The unfolded elastic cone 351 exerts resistance on the upward airflow and has the tendency to push the airflow to move laterally, causing the gas to move towards the inner wall of the membrane cylinder 62. The gas closer to the membrane cylinder 62 is more likely to desulfurize with the seawater on the outside.

[0067] The working principle is as follows: seawater is introduced into the membrane contact mechanism 6 by the seawater outflow mechanism 8, and then discharged through the seawater inflow mechanism 9. The exhaust gas in the exhaust pipe 10 enters the membrane contact mechanism 6 through the exhaust gas mechanism 4. The purified gas is discharged from the exhaust mechanism 5 and the exhaust pipe 2. The power rotation mechanism 7 drives the membrane contact mechanism 6 to rotate around the axis of the exhaust gas mechanism 4 through the exhaust gas mechanism 4 and the exhaust mechanism 5. During the rotation of the membrane contact mechanism 6, the air guide mechanism 3 blocks the flow of the exhaust gas inside, increases the distance the exhaust gas flows in the membrane contact mechanism 6, and increases the purification degree of sulfur content in the exhaust gas.

[0068] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A membrane absorption seawater desulfurization device for treating ship exhaust gas, comprising a main frame (1), an exhaust pipe (2), and a tail gas pipe (10), wherein the tail gas pipe (10) is located below the exhaust pipe (2), and both the tail gas pipe (10) and the exhaust pipe (2) are fixed to the main frame (1), characterized in that: The main frame (1) is provided with an exhaust gas mechanism (4) and an exhaust mechanism (5) on its inner side. The exhaust gas mechanism (4) is rotatably connected to the upper end of the exhaust pipe (10) and is connected to the exhaust pipe (10). The lower end of the exhaust pipe (2) is rotatably connected to the exhaust mechanism (5) and is connected to the exhaust mechanism (5). The upper end of the exhaust gas mechanism (4) is fixed and connected to multiple membrane contact mechanisms (6). The exhaust pipe (2) is equipped with a power rotation mechanism (7) for controlling the rotation of the exhaust mechanism (5). A seawater inlet mechanism (9) is installed on the upper side of the main frame (1), and a seawater outlet mechanism (8) is provided on the lower side of the main frame (1). The seawater inlet mechanism (9) passes through the exhaust pipe (2) and the exhaust mechanism (5). The membrane contact mechanism (6) is connected and communicates with the seawater inlet mechanism (9), and the membrane contact mechanism (6) is connected and communicates with the seawater outlet mechanism (8). The membrane contact mechanism (6) is coaxially provided with an air guiding mechanism (3) on its inner side. The lower end of the air guiding mechanism (3) rotates relative to the membrane contact mechanism (6), and the upper end of the air guiding mechanism (3) is rotatably connected to and communicates with the exhaust mechanism (5). The exhaust mechanism (5) includes an exhaust ring frame (51) and an axis pipe (52). The axis pipe (52) is installed at the axis of the exhaust ring frame (51), and the axis pipe (52) is connected to the exhaust ring frame (51). The axis pipe (52) is rotatably connected to and communicates with the exhaust pipe (2). The power rotation mechanism (7) controls the rotation of the shaft pipe (52) relative to the exhaust pipe (2), and the air guiding mechanism (3) is connected to the exhaust ring frame (51); The exhaust gas mechanism (4) includes an exhaust gas ring frame (41) and an axial inlet pipe (42). The axial inlet pipe (42) is installed at the axis of the exhaust gas ring frame (41), and the axial inlet pipe (42) is connected to the exhaust gas ring frame (41). The axial inlet pipe (42) is rotatably connected to and connected to the exhaust gas pipe (10). The membrane contact mechanism (6) includes a housing (61) and a membrane tube (62). The membrane tube (62) is coaxially installed inside the housing (61). The lower end of the housing (61) is fixed to the exhaust gas ring frame (41). The inside of the exhaust gas ring frame (41) is connected to the inside of the membrane tube (62). The outside of the housing (61) is connected to the seawater outflow mechanism (8) and the seawater inflow mechanism (9) respectively. The seawater inflow mechanism (9) and the seawater outflow mechanism (8) are both connected to the space between the housing (61) and the membrane tube (62). The air guiding mechanism (3) is coaxially located inside the membrane tube (62); The air guiding mechanism (3) includes a connecting tube (31) and an inner shaft (32). The inner shaft (32) is coaxially located inside the connecting tube (31). The upper end of the inner shaft (32) is coaxially fixed with the inner wall of the connecting tube (31). The lower end of the connecting tube (31) is rotatably connected to the upper end of the outer shell (61). The upper end of the connecting tube (31) is rotatably connected to the exhaust ring frame (51). A transmission gear (33) is coaxially installed on the outer side of the connecting tube (31). An internal gear ring (34) is coaxially provided on the outer side of the exhaust ring frame (51). The internal gear ring (34) is fixed to the main frame (1), and the transmission gear (33) meshes with the inner ring surface of the internal gear ring (34). The inner shaft (32) is fixedly installed with a number of flow guides (35) that can be deployed and retracted at one end inside the membrane tube (62). The guide (35) includes an elastic cone (351), the lower end of which is coaxially mounted with the inner shaft (32). The inner wall of the elastic cone (351) is connected to the outer surface of the inner shaft (32) by a tension spring (354). Multiple rigid rods (352) are fixed on the outer ring of the elastic cone (351). An air deflector (355) is rotatably connected to the outer side of the rigid rod (352). The end of the air deflector (355) away from the rigid rod (352) is elastically connected to the elastic cone (351) by an elastic rope (356). A gravity ball (353) is installed on the upper end of the rigid rod (352). The lower end of the elastic cone (351) is the small-diameter end; The power rotation mechanism (7) includes two winding wheels (71) and a winding cloth (72). The two ends of the winding cloth (72) are fixed to the two winding wheels (71) respectively. One of the winding wheels (71) is coaxially installed with the shaft pipe (52), and the other winding wheel (71) is rotatably connected to the exhaust pipe (2). The upper ends of the two winding wheels (71) are coaxially installed with meshing gears (73). A power gear (74) is provided between the two meshing gears (73). A movable ring frame (75) that can be powered to move is slidably sleeved on the outside of the exhaust pipe (2). The movable ring frame (75) is rotatably connected to the power gear (74), and the power gear (74) can be powered to rotate relative to the movable ring frame (75).

2. The membrane absorption seawater desulfurization device for treating ship exhaust gas according to claim 1, characterized in that: The seawater outflow mechanism (8) includes a collar (81) and a follower water storage ring (82). The follower water storage ring (82) is rotatably inserted into the inner side of the collar (81). A seawater outflow pipe (83) is inserted and installed on the outer side of the collar (81). The outer shell (61) away from the axis of the axial pipe (52) is fixed to the inner ring surface of the follower water storage ring (82).

3. A membrane absorption seawater desulfurization device for treating ship exhaust gas according to claim 1, characterized in that: The seawater inlet mechanism (9) includes a seawater inlet pipe (91) and a connector (92). The lower end of the seawater inlet pipe (91) is rotatably inserted into the upper surface of the connector (92). The outer surface of the outer shell (61) is fixed and connected to the connector (92). The upper end of the seawater inlet pipe (91) passes through the exhaust ring frame (51) and the exhaust pipe (2).

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