Wet treatment device for tail gas of marine methanol dual-fuel engine

Abstract

The invention discloses a marine methanol dual-fuel engine tail gas wet-type treatment device in the technical field of marine engines, and the marine methanol dual-fuel engine tail gas wet-type treatment device comprises an annular conveying assembly installed on the broadside of a ship, a plurality of treatment assemblies are arranged on the annular conveying assembly, and the annular conveying assembly is used for driving all the treatment assemblies to be immersed in and separated from seawater periodically; the treatment assembly comprises a cylinder, the interior of the cylinder is divided into a seawater washing area and a catalytic oxidation area through a partition plate, a stirrer is arranged in the seawater washing area, and a fluid power conversion device used for driving the stirrer through water flow is arranged at the end of the cylinder. And a catalysis module, an activated carbon module and a negative pressure pump are sequentially arranged in the catalytic oxidation region from the airflow conveying direction. According to the device, circulating operation of multiple treatment assemblies is achieved through the annular conveying assembly, continuous tail gas treatment is achieved, breakdown of the whole system caused by failure of a single treatment assembly is avoided, seawater is used as a washing medium, and low-cost and efficient tail gas treatment is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engines, and in particular to a wet treatment device for exhaust gas from a marine methanol dual-fuel engine. Background Art

[0002] A methanol dual-fuel engine refers to an engine that uses methanol and traditional fuels (such as diesel) at the same time. The composition of its exhaust gas depends on factors such as the ratio of methanol to traditional fuel in the fuel, combustion efficiency, and engine technical parameters. It mainly includes: nitrogen oxides, particulate matter, carbon monoxide, hydrocarbons, formaldehyde, methanol vapor, etc. Formaldehyde is a product of incomplete combustion of methanol. It is a toxic and harmful substance that is irritating and carcinogenic. Methanol vapor is methanol that has not been completely burned or volatilized. It is toxic and volatile.

[0003] Existing exhaust gas treatment devices are difficult to treat exhaust gases containing formaldehyde, methanol vapor, etc. in a targeted manner. Fixed scrubbers are generally used. However, fixed scrubbers are large in size, require vertical installation space, and need to be drained and cleaned periodically, resulting in treatment intervals that affect the continuous operation of the ship. They rely on static spraying or stirring, and the contact effect between the scrubbing liquid and the exhaust gas is poor, resulting in poor absorption efficiency for water-soluble pollutants such as formaldehyde and methanol.

[0004] To this end, a wet treatment device for exhaust gas from a marine methanol dual-fuel engine is provided to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a wet treatment device for exhaust gas from a methanol dual-fuel marine engine, which solves the problems of high cost and low efficiency of existing engine exhaust gas treatment devices.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: A wet treatment device for exhaust gas from a methanol dual-fuel marine engine comprises an annular conveying assembly mounted on the side of a ship. The annular conveying assembly is provided with a plurality of treatment assemblies for driving each treatment assembly to periodically immerse in and out of seawater.

[0007] The treatment component includes a cylindrical body, which is divided into a seawater washing zone and a catalytic oxidation zone by a partition plate. An agitator is provided in the seawater washing zone, and a fluid power conversion device for utilizing water flow to drive the agitator is provided at the end of the cylindrical body. A catalytic module, an activated carbon module and a negative pressure pump are provided in the catalytic oxidation zone in sequence from the direction of air flow transport; the part of the cylindrical body located in the seawater washing zone is provided with an exhaust gas inlet pipe, a seawater inlet pipe and a seawater outlet pipe, and the end of the catalytic oxidation zone is provided with an exhaust gas outlet pipe for discharging purified exhaust gas.

[0008] As a further optimization solution of the present invention, the annular conveying assembly includes a frame and four rollers arranged in a matrix in the frame; a conveyor belt is wound around the four rollers, and a driving motor is provided at one end of one of the rollers.

[0009] As a further optimization scheme of the present invention, a mounting seat and a second photoelectric sensor are fixedly provided on the middle outer surface of the cylinder, and the mounting seat is fixedly connected to the conveyor belt; a first photoelectric sensor cooperating with the second photoelectric sensor is respectively provided at each predetermined workstation along the running trajectory of the processing component on the frame, and a through hole is provided on the conveyor belt corresponding to each workstation.

[0010] As a further optimization scheme of the present invention, an exhaust pipe and a seawater delivery pipe are provided on one side of the annular conveying assembly; the exhaust pipe is sealed and docked with the exhaust gas input pipe of the treatment assembly running thereto, so as to introduce the engine exhaust gas into the seawater washing area, and the seawater delivery pipe is sealed and docked with the seawater output pipe of the treatment assembly running thereto, so as to centrally transport the washing wastewater in the seawater washing area to an external treatment tank for subsequent treatment.

[0011] As a further optimization scheme of the present invention, the ends of the exhaust gas inlet pipe, the seawater outlet pipe and the exhaust gas outlet pipe are all provided with electric control valves; the end of the exhaust pipe is provided with a telescopic inner tube, and the end of the telescopic inner tube is also provided with an electric control valve, and one side of the telescopic inner tube is provided with a driving member for driving it to move axially to achieve docking or separation with the processing component, and the telescopic inner tube is provided with a second spring for resetting; the end structure of the seawater delivery pipe is the same as the end structure of the exhaust pipe.

[0012] As a further optimization solution of the present invention, a through hole for exhaust gas to pass through is provided at the center of the partition plate, a control valve is provided at the through hole, a guide cover is provided at the outlet end of the control valve, and a porous plate is provided inside the guide cover.

[0013] As a further optimization solution of the present invention, an injection unit is further provided in the seawater washing area for utilizing the rotational kinetic energy of the fluid power conversion device to intermittently pressurize external seawater into the seawater washing area.

[0014] As a further optimization scheme of the present invention, the injection unit includes a piston cylinder and a mounting bracket for fixing the piston cylinder to the inner wall of the cylinder; the outlet end of the piston cylinder is provided with a tee, and the two ends of the tee are respectively provided with a water suction one-way valve and a drainage one-way valve, the water suction one-way valve is connected to the seawater input pipe, and the drainage one-way valve is fixed with a water outlet pipe, and the end of the water outlet pipe is provided with a nozzle, a piston rod is provided in the piston cylinder, and a pressure plate is fixed at the end of the piston rod, and a first spring is sleeved on the piston rod; the injection unit also includes a cam fixedly sleeved on the agitator shaft for squeezing the pressure plate.

[0015] As a further optimization solution of the present invention, an adding unit is further provided in the seawater washing area for automatically adding auxiliary chemicals into the seawater washing area by utilizing the rotational kinetic energy of the fluid power conversion device.

[0016] As a further optimization scheme of the present invention, the adding unit includes an annular storage cylinder fixed on the inner wall of the cylinder, the annular storage cylinder is divided into multiple storage chambers by a baffle, each of the storage chambers is provided with an extrusion hose, one end of the extrusion hose extends into the storage chamber and is provided with a gravity ball, and the other end extends to the outside of the annular storage cylinder; the adding unit also includes multiple shells fixed on the inner side of the annular storage cylinder and an incomplete gear fixedly mounted on the rotating shaft of the agitator, a wheel rack is rotatably provided in the shell, and a plurality of extrusion wheels for extruding the extrusion hose are provided on the wheel rack, and a driven gear meshing with the incomplete gear is fixedly mounted on the rotating shaft of the wheel rack.

[0017] The beneficial effects of the present invention are: 1. The present invention realizes the cyclic operation of multiple treatment components through an annular conveying component, realizes continuous exhaust gas treatment, avoids the failure of a single treatment component causing paralysis of the entire system, uses seawater as the washing medium, and uses a fluid power conversion device to drive the agitator to rotate, forcing the seawater and exhaust gas to form a dynamic turbulent mixing, thereby increasing the mass transfer area, and integrating the triple purification mechanism of physical washing, catalytic oxidation, and activated carbon adsorption to achieve low-cost and efficient exhaust gas treatment.

[0018] 2. The present invention utilizes the mechanical kinetic energy generated by the rotation of the fluid power conversion device to drive the reciprocating motion of the piston rod through a cam mechanism, thereby achieving intermittent pressurized injection of seawater. This does not require an additional power supply, saving energy. At the same time, it can enhance turbulence, increase the gas-liquid contact area and mass transfer efficiency, and enhance the absorption effect of pollutants.

[0019] 3. The present invention utilizes the mechanical kinetic energy generated by the rotation of the fluid power conversion device to drive the extrusion mechanism in the addition unit through mechanical linkage, thereby realizing automatic, quantitative, and periodic addition of auxiliary chemicals without the need for additional motors. This is energy-saving and environmentally friendly, helps maintain the stability of the value in the seawater washing area, and enhances the pollutant removal rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the assembly of the present invention on a ship; Figure 3 This is a schematic structural diagram of the annular conveying assembly of the present invention; Figure 4 Schematic diagram of the exploded structure of the processing component of the present invention Figure 1 ; Figure 5Schematic diagram of the exploded structure of the processing component of the present invention Figure 2 ; Figure 6 is a cross-sectional view of a processing assembly of the present invention; Figure 7 Schematic diagram of the injection unit structure of the present invention; Figure 8 Schematic diagram of the tailpipe structure of the present invention; Figure 9 This is a schematic diagram of the structure of the adding unit of the present invention; Figure 10 For the present invention Figure 9 A magnified schematic diagram of the structure in the middle.

[0021] In the picture: 1. Annular conveying assembly; 101. Frame; 102. Roller; 103. Conveyor belt; 104. Drive motor; 105. First photoelectric sensor; 2. Processing assembly; 201. Cylinder; 202. Partition plate; 202a. Control valve; 202b. Flow deflector; 202c. Perforated plate; 203. Exhaust gas inlet pipe; 204. Seawater inlet pipe; 205. Seawater outlet pipe; 206. Agitator; 207. Fluid power conversion device; 208. Catalytic module; 209. Activated carbon module; 210. Exhaust gas outlet pipe; 211. Mounting base; 212. Second photoelectric sensor; 213. Negative pressure pump; 214. Injection unit Element; 214a, piston cylinder; 214b, mounting frame; 214c, tee; 214d, water suction check valve; 214e, water discharge check valve; 214f, water outlet pipe; 214g, nozzle; 214h, pressure plate; 214i, first spring; 214j, cam; 215, adding unit; 215a, annular storage cylinder; 215b, baffle; 215c, extrusion hose; 215d, gravity ball; 215e, housing; 215f, wheel frame; 215g, extrusion wheel; 215h, driven gear; 215i, incomplete gear; 3, exhaust pipe; 301, telescopic inner tube; 302, second spring; 4, seawater delivery pipe. DETAILED DESCRIPTION

[0022] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Example 1 In order to solve the problems that the existing tail gas treatment devices generally use fixed scrubbers, which are large in size, have treatment intervals, and rely on static spraying or stirring, resulting in poor contact between the scrubbing liquid and the tail gas, please refer to Figure 1-Figure 2 、 Figure 4-Figure 6 The present invention provides a marine methanol dual-fuel engine exhaust wet treatment device, comprising an annular conveying assembly 1 mounted on the side of the ship, the lower portion of the device directly contacts the seawater, a plurality of treatment assemblies 2 are provided on the annular conveying assembly 1, and the annular conveying assembly 1 is used to drive each treatment assembly 2 to periodically immerse in and out of the seawater; the treatment assembly 2 comprises a cylindrical body 201, the interior of the cylindrical body 201 is divided into a seawater washing zone and a catalytic oxidation zone by a partition plate 202, an agitator 206 is provided in the seawater washing zone, and a device for utilizing water flow to drive the agitator 206 is provided at the end of the cylindrical body 201. The fluid power conversion device 207 can be a turbine or other structural conversion structure. The catalytic oxidation zone is provided with a catalytic module 208, an activated carbon module 209 and a negative pressure pump 213 in sequence from the air flow direction. The part of the cylindrical body 201 located in the seawater washing zone is provided with an exhaust gas inlet pipe 203, a seawater inlet pipe 204 and a seawater outlet pipe 205. The seawater inlet pipe 204 is provided with a stainless steel filter to block marine organisms (such as barnacles) and debris. The end of the catalytic oxidation zone is provided with an exhaust gas outlet pipe 210 for discharging the purified exhaust gas.

[0024] The circular conveying component 1 enables the circulation operation of multiple treatment components 2 to realize continuous exhaust gas treatment, avoiding the failure of a single treatment component 2 that would cause the entire system to be paralyzed. If a treatment component 2 fails, the operation of the treatment component 2 can be suspended, and the other treatment components 2 continue to operate. Seawater is used as a washing medium, and the fluid power conversion device 207 is used to drive the agitator 206 to rotate, forcing the seawater and the exhaust gas to form a dynamic turbulent mixing, thereby increasing the mass transfer area. The triple purification mechanism of physical washing, catalytic oxidation, and activated carbon adsorption is integrated to realize low-cost and efficient exhaust gas treatment, and has better space utilization and ship adaptability. It can be installed on the side or stern of the ship without affecting the original layout.

[0025] like Figure 3 、 Figure 5 As shown, the annular conveying assembly 1 includes a frame 101 and four rollers 102 arranged in a matrix in the frame 101; a conveyor belt 103 is wound around the four rollers 102, and a driving motor 104 is provided at one end of one of the rollers 102.

[0026] A mounting base 211 and a second photoelectric sensor 212 are fixedly mounted on the central outer surface of the cylindrical body 201. The mounting base 211 is fixedly connected to the conveyor belt 103. A first photoelectric sensor 105 is positioned at each predetermined station along the trajectory of the processing assembly 2 on the frame 101, interacting with the second photoelectric sensor 212. Through holes are provided on the conveyor belt 103 corresponding to each station. The photoelectric signals exchanged between the first photoelectric sensor 105 and the second photoelectric sensor 212 detect the current position of the processing assembly 2 on the endless conveyor assembly 1, enabling precise positioning control of the processing assembly 2.

[0027] like Figure 1 、 Figure 8 As shown, an exhaust pipe 3 and a seawater delivery pipe 4 are provided on one side of the annular conveying component 1; the exhaust pipe 3 is sealed and docked with the exhaust gas input pipe 203 of the treatment component 2 running thereto, so as to introduce the engine exhaust gas into the seawater washing area, and the seawater delivery pipe 4 is sealed and docked with the seawater output pipe 205 of the treatment component 2 running thereto, so as to centrally transport the washing wastewater in the seawater washing area to an external treatment tank for subsequent treatment.

[0028] The ends of the exhaust gas inlet pipe 203, the seawater output pipe 205 and the exhaust gas output pipe 210 are all provided with electric control valves; the end of the exhaust pipe 3 is provided with a telescopic inner tube 301, and the end of the telescopic inner tube 301 is also provided with an electric control valve. One side of the telescopic inner tube 301 is provided with a driving member for driving it to move axially to achieve docking or separation with the treatment component 2, and the telescopic inner tube 301 is provided with a second spring 302 for resetting; the end structure of the seawater delivery pipe 4 is the same as the end structure of the exhaust pipe 3, and also includes a telescopic inner tube 301, an electric control valve, a driving member and a second spring 302 to achieve automatic sealing docking with the seawater output pipe 205 on the treatment component 2.

[0029] like Figure 5 As shown, a through hole for the exhaust gas to pass through is provided at the center of the partition plate 202, a control valve 202a is provided at the through hole, a guide cover 202b is provided at the outlet end of the control valve 202a, and a porous plate 202c is provided inside the guide cover 202b to guide the exhaust gas to smoothly enter the catalytic oxidation zone and improve the uniformity of airflow distribution.

[0030] The endless conveyor belt 103 drives the treatment components 2 to circulate along a predetermined trajectory. When a certain treatment component 2 moves to the station where the exhaust pipe 3 is located, the telescopic inner tube 301 extends under the action of the driving member and seals and docks with the exhaust gas inlet pipe 203. The engine exhaust gas enters the seawater washing area through the exhaust gas inlet pipe 203. Then the endless conveyor belt 103 drives the treatment component 2 to move downward and immerse in the seawater. The external seawater is injected into the seawater washing area through the seawater inlet pipe 204. The water flow impact generated by the navigation of the ship causes the fluid power conversion device 207 installed at the end of the cylinder 201 to start rotating and drive the agitator 206 to rotate synchronously. The agitator 206 fully mixes the seawater and exhaust gas in the seawater washing area, enhances the gas-liquid mass transfer effect, and thus efficiently removes pollutants such as NOx, formaldehyde, and methanol in the exhaust gas. Then the endless conveyor belt 103 drives the treatment component 2 to separate from the seawater and enter When at the next station, the control valve 202a is opened, and the washed exhaust gas passes through the through holes of the partition plate 202, is evenly distributed through the guide cover 202b and the porous plate 202c, and enters the catalytic oxidation zone. The catalytic module 208 catalytically oxidizes methanol, VOCs and other organic matter in the exhaust gas, and the activated carbon module 209 adsorbs residual odor, trace pollutants, etc.; then the annular conveyor belt 103 drives the treatment component 2 to continue to move to the next station, and the exhaust gas output pipe 210 is opened to discharge the purified exhaust gas; then the annular conveyor belt 103 drives the treatment component 2 to continue to move to the station where the seawater delivery pipe 4 is located, and the washing wastewater in the seawater washing area is centrally transported to the external treatment pool for subsequent treatment. After the wastewater discharge is completed, the treatment component 2 returns to the starting station of the exhaust pipe 3 again, ready to enter the next cycle treatment cycle, thereby realizing continuous, stable and efficient exhaust gas purification operation.

[0031] Example 2 On the basis of Example 1, in order to improve the mixing efficiency between the exhaust gas and the seawater and enhance the absorption effect of the pollutants, Figure 4 、 Figure 7 As shown, an injection unit 214 is further provided in the seawater washing area for utilizing the rotational kinetic energy of the fluid power conversion device 207 to intermittently press external seawater into the seawater washing area.

[0032] The injection unit 214 includes a piston cylinder 214a and a mounting bracket 214b for fixing the piston cylinder 214a to the inner wall of the cylindrical body 201; a tee 214c is provided at the outlet end of the piston cylinder 214a, and a water suction one-way valve 214d and a water discharge one-way valve 214e are respectively provided at both ends of the tee 214c. The water suction one-way valve 214d is connected to the seawater inlet pipe 204, and a water outlet pipe 214f is fixed on the water discharge one-way valve 214e, and a nozzle 214g is provided at the end of the water outlet pipe 214f. A piston rod is provided in the piston cylinder 214a, and a pressure plate 214h is fixed at the end of the piston rod. A first spring 214i is sleeved on the piston rod; the injection unit 214 also includes a cam 214j fixedly sleeved on the rotating shaft of the agitator 206 for squeezing the pressure plate 214h.

[0033] The agitator 206 rotates synchronously with the fluid power conversion device 207, and the cam 214j fixed on the rotating shaft of the agitator 206 rotates accordingly. The cam 214j periodically squeezes the pressure plate 214h, and the pressure plate 214h pushes the piston rod to move into the piston cylinder 214a. The first spring 214i is compressed and stores energy, and the pressure in the piston cylinder 214a increases. The water suction check valve 214d is closed, and the discharge check valve 214e is opened. Seawater is sprayed out from the nozzle 214g at a high speed through the outlet pipe 214f, thereby enhancing the turbulence in the washing area. The cam 214j rotates away from the pressure plate 214h, and the first spring 214i releases energy, pushing the piston rod back to its original position. Negative pressure is formed in the piston cylinder 214a, the water discharge one-way valve 214e is closed, and the water intake one-way valve 214d is opened, and fresh seawater is sucked into the piston cylinder 214a from the seawater inlet pipe 204. As the agitator 206 continues to rotate, the cam 214j repeatedly squeezes and releases to achieve periodic seawater injection and injection. The mechanical kinetic energy generated by the rotation of the fluid power conversion device 207 is used to drive the piston rod to reciprocate through the cam mechanism to achieve intermittent pressurized injection of seawater. No additional power supply is required, saving energy. At the same time, it can enhance turbulence, increase the gas-liquid contact area and mass transfer efficiency, improve washing efficiency, and enhance the absorption effect of pollutants.

[0034] Example 3 On the basis of Example 1 and Example 2, in order to further improve the removal efficiency of pollutants such as NOx and methanol in the tail gas, Figure 5 、 Figure 9-10 As shown, an adding unit 215 is further provided in the seawater washing area for automatically adding auxiliary chemicals, such as sodium hydroxide solution, surfactant, etc., into the seawater washing area by utilizing the rotational kinetic energy of the fluid power conversion device 207 .

[0035] The adding unit 215 includes an annular storage cylinder 215a fixed on the inner wall of the cylindrical body 201. The annular storage cylinder 215a is divided into multiple storage chambers by a baffle 215b for storing different chemical substances. Each storage chamber is provided with an extrusion hose 215c. One end of the extrusion hose 215c extends into the storage chamber and is provided with a gravity ball 215d, and the other end extends to the outside of the annular storage cylinder 215a; the adding unit 215 also includes multiple shells 215e fixed on the inner side of the annular storage cylinder 215a and an incomplete gear 215i fixedly mounted on the rotating shaft of the agitator 206. A wheel frame 215f is rotatably provided in the shell 215e. The wheel frame 215f is provided with multiple extrusion wheels 215g for extruding the extrusion hose 215c. A driven gear 215h meshing with the incomplete gear 215i is fixedly mounted on the rotating shaft of the wheel frame 215f.

[0036] The agitator 206 rotates synchronously with the fluid power conversion device 207. The incomplete gear 215i fixed on the rotating shaft of the agitator 206 is periodically meshed with the driven gear 215h, driving the wheel frame 215f to swing back and forth in the shell 215e. The multiple extrusion wheels 215g on the wheel frame 215f sequentially apply pressure to the extrusion hose 215c outside the annular storage cylinder 215a. When the extrusion hose 215c is pressurized, the internal space is reduced, and the chemical substances in the storage chamber are squeezed out. The kinetic energy generated by the rotation of the fluid power conversion device 207 is used to drive the extrusion mechanism in the addition unit 215 through mechanical linkage to realize the automatic, quantitative and periodic addition of auxiliary chemical substances (such as sodium hydroxide solution, surfactant, etc.). No additional motor is required, which is energy-saving and environmentally friendly. It helps to maintain a stable pH value in the seawater washing area and enhance the pollutant removal rate.

[0037] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A wet treatment device for exhaust gas from a methanol dual-fuel marine engine, comprising an annular conveying assembly (1) mounted on the side of a vessel, characterized in that: The annular conveying assembly (1) is provided with a plurality of processing assemblies (2), and the annular conveying assembly (1) is used to drive each processing assembly (2) to periodically immerse in and out of seawater; The treatment assembly (2) comprises a cylindrical body (201), wherein the cylindrical body (201) is divided into a seawater washing zone and a catalytic oxidation zone by a partition plate (202), wherein an agitator (206) is provided in the seawater washing zone, and a fluid power conversion device (207) for utilizing water flow to drive the agitator (206) is provided at the end of the cylindrical body (201), and wherein a catalytic module (208), an activated carbon module (209), and a negative pressure pump (213) are provided in the catalytic oxidation zone in order from the air flow transport direction; The portion of the cylindrical body (201) located in the seawater washing zone is provided with an exhaust gas inlet pipe (203), a seawater inlet pipe (204), and a seawater outlet pipe (205), and the end of the catalytic oxidation zone is provided with an exhaust gas outlet pipe (210) for discharging the purified exhaust gas.

2. A marine methanol dual-fuel engine exhaust wet treatment device according to claim 1, characterized in that: The annular conveying assembly (1) comprises a frame (101) and four rollers (102) arranged in a matrix inside the frame (101); A conveyor belt (103) is wound around the four rollers (102), and a driving motor (104) is provided at one end of one of the rollers (102).

3. A wet treatment device for exhaust gas from a marine methanol dual-fuel engine according to claim 2, characterized in that: A mounting seat (211) and a second photoelectric sensor (212) are fixedly provided on the outer surface of the middle portion of the cylindrical body (201), and the mounting seat (211) is fixedly connected to the conveyor belt (103); A first photoelectric sensor (105) cooperating with a second photoelectric sensor (212) is provided at each predetermined station along the running track of the processing component (2) on the frame (101), and a through hole is provided on the conveyor belt (103) corresponding to each station.

4. The wet treatment device for exhaust gas from a marine methanol dual-fuel engine according to claim 1, characterized in that: A tail gas pipe (3) and a seawater delivery pipe (4) are provided on one side of the annular delivery assembly (1); The tail gas pipe (3) is sealed and docked with the tail gas input pipe (203) of the processing assembly (2) running thereto, so as to guide the engine tail gas into the seawater washing area. The seawater delivery pipe (4) is sealed and docked with the seawater output pipe (205) of the processing assembly (2) running thereto, so as to centrally transport the washing wastewater in the seawater washing area to an external treatment pool for subsequent treatment.

5. A wet treatment device for exhaust gas from a marine methanol dual-fuel engine according to claim 4, characterized in that: The ends of the tail gas input pipe (203), the seawater output pipe (205), and the tail gas output pipe (210) are all provided with electric control valves; The end of the exhaust pipe (3) is provided with a telescopic inner tube (301), and the end of the telescopic inner tube (301) is also provided with an electric control valve. One side of the telescopic inner tube (301) is provided with a driving member for driving it to move axially to achieve docking or separation with the processing component (2), and the telescopic inner tube (301) is provided with a second spring (302) for resetting. The end structure of the seawater delivery pipe (4) is the same as the end structure of the tail gas pipe (3).

6. The wet treatment device for exhaust gas from a marine methanol dual-fuel engine according to claim 1, characterized in that: A through hole for allowing exhaust gas to pass through is provided at the center of the partition plate (202), a control valve (202a) is provided at the through hole, a flow guide cover (202b) is provided at the outlet end of the control valve (202a), and a porous plate (202c) is provided inside the flow guide cover (202b).

7. The wet treatment device for exhaust gas from a marine methanol dual-fuel engine according to claim 1, characterized in that: The seawater washing area is also provided with an injection unit (214) for utilizing the rotational kinetic energy of the fluid power conversion device (207) to intermittently press external seawater into the seawater washing area.

8. The wet treatment device for exhaust gas from a marine methanol dual-fuel engine according to claim 7, characterized in that: The injection unit (214) comprises a piston cylinder (214a) and a mounting frame (214b) for fixing the piston cylinder (214a) to the inner wall of the cylinder (201); The outlet end of the piston cylinder (214a) is provided with a tee (214c), and both ends of the tee (214c) are provided with a water suction one-way valve (214d) and a water discharge one-way valve (214e), respectively. The water suction one-way valve (214d) is connected to the seawater inlet pipe (204), and the water discharge one-way valve (214e) is fixedly provided with a water outlet pipe (214f), and the end of the water outlet pipe (214f) is provided with a nozzle (214g). A piston rod is provided in the piston cylinder (214a), and a pressure plate (214h) is fixedly provided at the end of the piston rod. A first spring (214i) is sleeved on the piston rod. The injection unit (214) further comprises a cam (214j) fixedly sleeved on the rotating shaft of the stirrer (206) and used for pressing the pressure plate (214h).

9. The wet treatment device for exhaust gas from a marine methanol dual-fuel engine according to claim 1, characterized in that: The seawater washing area is also provided with an adding unit (215) for automatically adding auxiliary chemicals into the seawater washing area by utilizing the rotational kinetic energy of the fluid power conversion device (207).

10. A wet treatment device for exhaust gas from a marine methanol dual-fuel engine according to claim 9, characterized in that: The adding unit (215) comprises an annular storage cylinder (215a) fixedly arranged on the inner wall of the cylindrical body (201); the annular storage cylinder (215a) is divided into a plurality of storage chambers by a baffle (215b); each storage chamber is provided with an extrusion hose (215c); one end of the extrusion hose (215c) extends into the storage chamber and is provided with a gravity ball (215d); the other end extends to the outside of the annular storage cylinder (215a); The adding unit (215) further comprises a plurality of shells (215e) fixedly arranged on the inner side of the annular storage cylinder (215a) and an incomplete gear (215i) fixedly sleeved on the rotating shaft of the agitator (206); a wheel frame (215f) is rotatably arranged in the shell (215e); a plurality of extrusion wheels (215g) for extruding the extrusion hose (215c) are provided on the wheel frame (215f); and a driven gear (215h) meshing with the incomplete gear (215i) is fixedly sleeved on the rotating shaft of the wheel frame (215f).

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