Exhaust gas recirculation self-cleaning premixing device of marine methanol engine

Abstract

The invention relates to the technical field of marine methanol engines, and provides an exhaust gas recirculation self-cleaning premixing device of a marine methanol engine, which comprises a discharge pipe connected with the exhaust gas discharge end of the methanol engine, and an adsorption assembly, a cooler and a premixing box which are connected with the discharge pipe and are sequentially communicated; the air inlet end of the adsorption assembly is provided with an air taking pipe connected with the discharge pipe, the air outlet end of the adsorption assembly is provided with an air guide pipe which directly faces the air taking pipe and is connected with the cooler, the adsorption assembly comprises a barrel and a net-shaped barrel rotating in the barrel, the interior of the net-shaped barrel is divided into a dehumidification area and an acid removal area, and an air distribution pipe is arranged between the air guide pipe and the dehumidification area; the adsorbent is used for recovering adsorbability of the water-absorbing particles and the activated carbon; the adsorption assembly can recover the adsorbability to moisture and formic acid through self-circulation, the removal effect on moisture and formic acid in waste gas is guaranteed, manual regular maintenance and cleaning are not needed, convenience is achieved, the maintenance cost and workload are greatly reduced, and normal operation of a ship is not affected.

Description

Technical Field

[0001] The invention relates to the technical field of marine methanol engines, in particular to an exhaust gas recirculation self-cleaning premixing device of a marine methanol engine. Background Art

[0002] In ship power systems, marine methanol engines, as a power device with environmental protection potential, are gradually becoming a hot spot for research and application.

[0003] When methanol is burned as fuel in a marine engine, due to the complex chemical reactions in the combustion process, by-products such as water (in the form of water vapor) and formic acid (due to the high temperature and high pressure environment in the combustion chamber, some methanol molecules undergo incomplete oxidation reactions, and formic acid is finally generated after a series of intermediate chemical processes). Formic acid is highly corrosive. If it enters the subsequent components of the engine with the exhaust gas, it will seriously corrode the metal components, reduce the performance and reliability of the engine, and shorten its service life. Therefore, during the exhaust gas recirculation process, it is necessary to remove water vapor and formic acid in the exhaust gas. The current devices for removing water vapor and formic acid in the exhaust gas do not have the function of self-recovering adsorption. As the use time increases, the water vapor and formic acid removal devices will be saturated with adsorption, and manual maintenance and cleaning will be required on a regular basis. This not only increases the maintenance cost and workload, but also the engine may need to be shut down during maintenance, affecting the normal operation of the ship, which is very inconvenient to operate.

[0004] Therefore, the present invention proposes an exhaust gas recirculation self-cleaning premixing device for a marine methanol engine to solve the above problems. Summary of the invention

[0005] The embodiment of the present invention aims to provide an exhaust gas recirculation self-cleaning premixing device for a marine methanol engine to solve the above-mentioned problems.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An exhaust gas recirculation self-cleaning premixing device for a marine methanol engine comprises an exhaust pipe connected to an exhaust gas discharge end of the methanol engine, and an adsorption component for removing moisture and formic acid from the exhaust gas, a cooler for cooling the exhaust gas, and a premixing box for mixing the treated exhaust gas with external air, which are connected to the exhaust pipe and are sequentially connected and arranged;

[0008] The air inlet end of the adsorption component is provided with an air intake pipe connected to the discharge pipe, and the air outlet end is provided with an air guide pipe facing the air intake pipe and connected to the cooler. The adsorption component includes a cylinder and a mesh cylinder rotating in the cylinder. The interior of the mesh cylinder is divided into a dehumidification zone filled with water-absorbing particles for adsorbing moisture and a deacidification zone filled with activated carbon for adsorbing formic acid. An air distribution pipe is provided between the air guide pipe and the dehumidification zone to restore the adsorption properties of the water-absorbing particles and the activated carbon.

[0009] In an optional solution: an air outlet hopper is embedded in the side of the cylinder close to the dehumidification zone, the end of the air distribution pipe away from the air guide pipe is connected to the air inlet end of the air outlet hopper, and a through hole is arranged at a position opposite to the cylinder and the air outlet hopper.

[0010] In an optional solution: the premixing box is provided with an air inlet for external air to enter.

[0011] In an optional solution: the premixing device also includes a dust filter assembly for removing dust from incoming air and capable of self-cleaning, the dust filter assembly includes a base plate nested on the air inlet and a plate rotatably arranged on the base plate, the plate is provided with a filter area whose rotating path fully covers the air inlet, and the filter area is in contact with the air inlet port, a box body is embedded in the base plate, the box body is located on the rotating path of the filter area, and the box body is open on one side of the filter area, and a sealing piston plate is provided in the box body.

[0012] In an optional scheme: the dust filter assembly also includes a linkage component, which includes a sliding rod arranged on the sealing piston plate and passing through the upper side of the box body, a push piece is provided at the upper end of the sliding rod, a plurality of springs are provided on the sealing piston plate, and a plurality of pushing pieces cooperating with the push piece are evenly arranged circumferentially on the plate, the side of the pushing piece in contact with the push piece is arc-shaped, and the other side opposite to the arc-shaped side is perpendicular to the plate.

[0013] In an optional solution, a knocking ball is provided on the push member, which is used to knock the plate member when the push member is reset to its original position to cause it to vibrate so as to shake off the dust adhering to the filter area.

[0014] In an optional solution: an elastic rubber ring is provided at the air inlet port, and the filter area is in extrusion contact with the elastic rubber ring.

[0015] In an optional solution: the premixing device further includes a power assembly, the power assembly includes a wind wheel rotatably arranged in the discharge pipe and a driven shaft rotatably arranged, a first transmission component is provided between the discharge pipe and the mesh cylinder, and the first transmission component is a reduction transmission structure.

[0016] In an optional solution: a third transmission component is provided between the wind wheel and the driven shaft, a shaft body is provided at the center of the plate, and a second transmission component is provided between the shaft body and the driven shaft.

[0017] In an optional solution: a plurality of fan blades are evenly arranged on the shaft in a circumferential direction, so as to generate airflow when the shaft rotates so as to move dust falling off the filter area away from the air inlet port.

[0018] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows:

[0019] 1. The water-absorbing particles are heated by a dry hot air flow without formic acid to cause the water adsorbed in the water-absorbing particles to gasify and form water vapor. The water vapor passes through the deacidification zone under the action of the air flow and is finally discharged through the through hole. The water vapor formed by the dry water-absorbing particles elutes the formic acid adsorbed on the activated carbon, so that the water-absorbing particles and the activated carbon recover the adsorption of water and formic acid respectively, and the adsorption components recover the adsorption of water and formic acid in a self-circulating manner, thereby ensuring the removal effect of water and formic acid in the exhaust gas. No manual regular maintenance and cleaning are required, which is convenient, greatly reduces the maintenance cost and workload, and does not affect the normal operation of the ship;

[0020] 2. When the plate rotates, it drives the arc-shaped side of multiple pushing members to alternately contact and resist the pushing members, and drives the pushing members to move up a certain distance, that is, drives the sealing piston plate to move up a certain distance. When the sealing piston plate moves up, air is pumped, and at the same time, several springs tend to be compressed. As the plate continues to rotate, the pushing members will separate from the pushing members, and the sealing piston plate will be instantly reset under the action of several compressed springs. The high-speed moving sealing piston plate will instantly push the airflow in the box toward the filter area to form an instantaneous high-speed airflow. The instantaneous high-speed airflow impacts the filter side from the clean side of the filter area, thereby blowing off dust and other particulates adhering to the filter side of the filter area, thereby cleaning the filter area, so that the dust filter component has a self-cleaning function to avoid dust clogging.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings herein are incorporated into and constitute a part of the specification to illustrate embodiments consistent with the present application and are used together with the specification to explain the principles of the present application. At the same time, these drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments.

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0024] Figure 2 Schematic diagram of the structure of the adsorption component in an embodiment of the present invention.

[0025] Figure 3Schematic diagram of the structure of the dust filter assembly in an embodiment of the present invention.

[0026] Figure 4 Schematic diagram of the structure of the dust filter assembly from another angle in an embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of the arrangement between the box body, the push member, the knocking ball, the sealing piston plate and the sliding rod in an embodiment of the present invention.

[0028] Figure 6 for Figure 1 Enlarged view of point A in the middle.

[0029] Figure number notes: 1-discharge pipe, 2-adsorption component, 201-cylinder, 202-mesh cylinder, 203-dehumidification zone, 204-acid removal zone, 205-through hole, 206-air guide pipe, 207-air distribution pipe, 208-air outlet bucket, 209-first transmission component, 3-cooler, 4-premixing box, 5-air inlet, 6-exhaust port, 7-dust filter component, 701-plate, 702-filter Area, 703-base plate, 704-box body, 705-push member, 706-knocking ball, 707-pushing member, 708-sealing piston plate, 709-sliding rod, 710-spring, 711-axis body, 712-second transmission component, 713-fan blade, 8-power assembly, 801-wind wheel, 802-third transmission component, 803-driven shaft, 804-conical bucket, 9-air intake pipe. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here 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. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0031] See also Figure 1 and Figure 2, an exhaust gas recirculation self-cleaning premixing device for a marine methanol engine, comprising an exhaust pipe 1 connected to an exhaust end of the methanol engine, and an adsorption component 2 for removing moisture and formic acid in the exhaust gas, a cooler 3 for cooling the exhaust gas, and a premixing box 4 for mixing the treated exhaust gas with external air, which are connected to the exhaust pipe 1 and are sequentially connected and arranged, the air inlet end of the adsorption component 2 is provided with an air intake pipe 9 connected to the exhaust pipe 1, and the air outlet end is provided with an air guide pipe 206 facing the air intake pipe 9 and connected to the cooler 3, the adsorption component 2 comprises a cylinder 201 and a mesh cylinder 202 rotating in the cylinder 201, the mesh cylinder 202 is internally divided into a dehumidification zone 203 filled with water-absorbing particles for absorbing moisture and a deacidification zone 204 filled with activated carbon for absorbing formic acid, and an air distribution pipe 207 is provided between the air guide pipe 206 and the dehumidification zone 203 for restoring the adsorption properties of the water-absorbing particles and the activated carbon;

[0032] An air outlet hopper 208 is embedded on one side of the cylinder 201 close to the dehumidification zone 203 , and one end of the air distribution pipe 207 away from the air guide pipe 206 is connected to the air inlet end of the air outlet hopper 208 . A through hole 205 is arranged at a position directly opposite to the cylinder 201 and the air outlet hopper 208 .

[0033] It should be noted that the amount of exhaust gas taken in by the air intake pipe 9 is greater than the amount of exhaust gas required by the engine, and an EGR valve is provided in the air duct 206 to control the amount of exhaust gas entering. The corresponding other matching components and the technology are existing technologies and will not be described in detail here.

[0034] The exhaust gas generated by the operation of the methanol engine is discharged through the exhaust pipe 1, and part of the exhaust gas is taken through the air intake pipe 9. The taken exhaust gas passes through the adsorption component 2 in turn to remove moisture and formic acid, is cooled by the cooler 3 and enters the premixing box 4 to be mixed with the external air in an appropriate proportion, and then is discharged to the engine cylinder to remove moisture and formic acid in the exhaust gas. The specific process is: the taken exhaust gas passes through the dehumidification area 203 and the acid removal area 204 in turn, and then partially enters the cooler 3 through the air guide pipe 206, and the moisture and formic acid in the exhaust gas are adsorbed by the filled water-absorbing particles and activated carbon respectively (forming a dry hot air flow without formic acid); when the engine is working, the mesh cylinder 202 is in a rotating state (low speed), that is, the water-absorbing particles and activated carbon in the part between the air intake pipe 9 and the air guide pipe 206 are in a continuous renewal state, and part of the dry hot air without formic acid is The flow is diverted through the gas distribution pipe 207 to the gas outlet hopper 208 for discharge. When the water-absorbing particles adsorbed with water and the activated carbon adsorbed with formic acid rotate to the gas outlet hopper 208, the water-absorbing particles are heated by the dry hot air flow without formic acid to cause the water adsorbed in the water-absorbing particles to gasify and form water vapor. The water vapor passes through the deacidification zone 204 under the action of the air flow and is finally discharged through the through hole 205. The water vapor formed by the dry water-absorbing particles is used to elute the formic acid adsorbed on the activated carbon (steam desorption method), so that the water-absorbing particles and the activated carbon respectively recover the adsorption of water and formic acid, and the adsorption component 2 is self-circulated to recover the adsorption of water and formic acid, thereby ensuring the removal effect of water and formic acid in the exhaust gas, without the need for manual regular maintenance and cleaning, which is convenient, greatly reduces the maintenance cost and workload, and does not affect the normal operation of the ship;

[0035] The cooler 3 is of prior art, including but not limited to liquid cooling, and a flow channel for the exhaust gas to flow is arranged inside. When the exhaust gas flows through the flow channel, heat exchange is performed with the coolant to achieve cooling. The specific structure and principle of the cooler 3 are not described here.

[0036] Furthermore, the water-absorbing particles are molecular sieve particles, activated alumina particles, etc., which have excellent high temperature resistance. Similarly, the activated carbon is high temperature resistant activated carbon such as ceramic coated activated carbon.

[0037] See also Figure 1 , Figure 3 to Figure 5 In one embodiment of the present invention, the premixing box 4 is provided with an air inlet 5 for external air to enter;

[0038] The premixing device further includes a dust filter assembly 7 for removing dust from the incoming air and capable of self-cleaning, the dust filter assembly 7 includes a base plate 703 nested on the air inlet 5 and a plate 701 rotatably arranged on the base plate 703, the plate 701 is provided with a filter area 702 whose rotation path completely covers the air inlet 5, and the filter area 702 is in contact with and fits with the port of the air inlet 5, a box body 704 is embedded on the base plate 703, the box body 704 is located on the rotation path of the filter area 702, and the box body 704 is open toward one side of the filter area 702, and a sealing piston plate 708 is provided in the box body 704;

[0039] The dust filter assembly 7 also includes a linkage component, which includes a slide bar 709 arranged on the sealing piston plate 708 and passing through the upper side of the box body 704, and a push piece 705 is arranged on the upper end of the slide bar 709. The sealing piston plate 708 is provided with a plurality of springs 710. A plurality of pushing pieces 707 cooperating with the push piece 705 are evenly arranged circumferentially on the plate 701. The side of the pushing piece 707 in contact with the push piece 705 is arc-shaped, and the other side opposite to the arc-shaped side is vertical to the plate 701.

[0040] It should be noted that a corresponding air intake structure is provided at the air inlet 5 to control the amount of external air entering. Its specific structure and corresponding control technology are existing technologies and will not be elaborated here. In addition, the filter area 702 is a hollow annular filter screen or filter plate arranged on the plate 701 to filter out dust and other particulate matter in the air during air intake.

[0041] In this embodiment, when the engine is working, the plate 701 is in a state of continuous rotation, and the position corresponding to the filter area 702 and the air inlet 5 is constantly updated. When the plate 701 rotates, it drives the arc-shaped side of multiple push members 707 to contact and resist the push member 705 alternately, and drives the push member 705 to move up a certain distance, that is, drives the sealing piston plate 708 to move up a certain distance. When the sealing piston plate 708 moves up, air is pumped, and at the same time, a number of springs 710 tend to be compressed. As the plate 701 continues to rotate, the push member 707 will be separated from the push member 705. One side is vertical to the plate 701, so when the pushing member 707 is separated from the pushing member 705, the sealing piston plate 708 is instantly reset under the action of a number of compressed springs 710, and the sealing piston plate 708 moves at high speed to instantly push the airflow in the box body 704 toward the filter area 702 to form an instantaneous high-speed airflow, and the instantaneous high-speed airflow impacts the filter side from the clean side of the filter area 702, thereby blowing off dust and other particulates adhering to the filter side of the filter area 702, thereby cleaning the filter area 702, so that the dust filter assembly 7 has a self-cleaning function to avoid dust clogging.

[0042] Furthermore, in this embodiment, the premixing box 4 is also provided with an exhaust port 6, and the exhaust gas is mixed with the air and then discharged through the exhaust port 6 and sent to the engine cylinder.

[0043] Furthermore, in the present embodiment, a knocking ball 706 is provided on the push member 705, which is used for knocking the plate 701 to make it vibrate so as to shake off the dust adhered to the filter area 702 when the push member 705 is reset into place, and the knocking ball 706 is a soft rubber ball to avoid damaging the plate 701 by knocking; an elastic rubber ring is provided at the port of the air inlet 5, and the filter area 702 is in extrusion contact with the elastic rubber ring. When the knocking ball 706 knocks the plate 701 to make it vibrate, the elastic rubber ring generates adaptive elastic deformation, thereby ensuring the fit between the filter area 702 and the port of the air inlet 5, avoiding the generation of gaps when the plate 701 vibrates, thereby causing the external unfiltered dust air to enter the premixing box 4.

[0044] See also Figure 1 and Figure 6 In one embodiment of the present invention, the premixing device further comprises a power assembly 8, the power assembly 8 comprises a wind wheel 801 rotatably arranged in the discharge pipe 1 and a driven shaft 803 (arranged on the hull) rotatably arranged, and a first transmission component 209 is arranged between the discharge pipe 1 and the mesh tube 202, and the first transmission component 209 is a reduction transmission structure;

[0045] A third transmission component 802 is provided between the wind wheel 801 and the driven shaft 803 , a shaft body 711 is provided at the center of the plate 701 , and a second transmission component 712 is provided between the shaft body 711 and the driven shaft 803 .

[0046] In this embodiment, the first transmission component 209 is composed of a differential drive belt structure combined with a gear reduction transmission structure, which is the prior art, and its specific components and connection relationships are not described here. The second transmission component 712 and the third transmission component 802 are belt transmission structures, sprocket chain transmission structures, gear meshing transmission structures, etc. in the prior art, and this embodiment is not limited here. The exhaust gas discharged by the engine impacts the wind wheel 801 to make it rotate, and under the action of the first transmission component 209, the second transmission component 712 and the third transmission component 712, the mesh tube 202 and the plate 701 are driven to rotate accordingly.

[0047] Furthermore, in this embodiment, a conical bucket 804 is provided inside the discharge pipe 1 at the front end of the wind wheel 801 , and the conical bucket 804 accelerates the flow of exhaust gas to ensure the impact driving effect on the wind wheel 801 .

[0048] Furthermore, in this embodiment, a plurality of fan blades 713 are evenly arranged on the shaft 711 in a circumferential direction, so as to generate airflow when the shaft 711 rotates so that the dust falling off the filter area 702 is away from the air inlet 5 port, thereby ensuring that the air near the air inlet 5 port is not polluted by the falling dust as much as possible.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An exhaust gas recirculation self-cleaning premixing device for a marine methanol engine, comprising an exhaust pipe (1) connected to an exhaust gas discharge end of the methanol engine, and an adsorption component (2) for removing moisture and formic acid from the exhaust gas, a cooler (3) for cooling the exhaust gas, and a premixing box (4) for mixing the treated exhaust gas with external air, which are connected to the exhaust pipe (1) and arranged in sequence, characterized in that: The air inlet end of the adsorption component (2) is provided with an air intake pipe (9) connected to the discharge pipe (1), and the air outlet end is provided with an air guide pipe (206) facing the air intake pipe (9) and connected to the cooler (3). The adsorption component (2) comprises a cylinder (201) and a mesh cylinder (202) rotating inside the cylinder (201). The mesh cylinder (202) is internally divided into a dehumidification zone (203) filled with water-absorbing particles for absorbing moisture and a deacidification zone (204) filled with activated carbon for absorbing formic acid. An air distribution pipe (207) is provided between the air guide pipe (206) and the dehumidification zone (203) for restoring the adsorption properties of the water-absorbing particles and the activated carbon.

2. The exhaust gas recirculation self-cleaning premixing device of a marine methanol engine according to claim 1, characterized in that: An air outlet hopper (208) is embedded on one side of the cylinder (201) close to the dehumidification zone (203); one end of the air distribution pipe (207) away from the air guide pipe (206) is connected to the air inlet end of the air outlet hopper (208); and a through hole (205) is arranged at a position directly opposite to the cylinder (201) and the air outlet hopper (208).

3. The exhaust gas recirculation self-cleaning premixing device of the marine methanol engine according to claim 1, characterized in that: The premixing box (4) is provided with an air inlet (5) for external air to enter.

4. The exhaust gas recirculation self-cleaning premixing device of a marine methanol engine according to claim 3, characterized in that: The premixing device further comprises a dust filter assembly (7) for removing dust from the incoming air and capable of self-cleaning, the dust filter assembly (7) comprising a base plate (703) nested on the air inlet (5) and a plate member (701) rotatably arranged on the base plate (703), the plate member (701) being provided with a filter area (702) whose rotation path completely covers the air inlet (5), and the filter area (702) is in contact with and fits with a port of the air inlet (5), the base plate (703) being embedded with a box body (704), the box body (704) being located on the rotation path of the filter area (702), and the box body (704) being open on one side facing the filter area (702), and a sealing piston plate (708) being provided in the box body (704).

5. The exhaust gas recirculation self-cleaning premixing device of the marine methanol engine according to claim 4, characterized in that: The dust filter assembly (7) also includes a linkage component, which includes a slide bar (709) arranged on the sealing piston plate (708) and passing through the upper side of the box body (704), a push piece (705) is arranged at the upper end of the slide bar (709), a plurality of springs (710) are arranged on the sealing piston plate (708), and a plurality of push pieces (707) cooperating with the push pieces (705) are evenly arranged circumferentially on the plate (701), and the side of the push piece (707) in contact with the push piece (705) is arc-shaped, and the other side opposite to the arc-shaped side is perpendicular to the plate (701).

6. The exhaust gas recirculation self-cleaning premixing device of a marine methanol engine according to claim 5, characterized in that: The push member (705) is provided with a knocking ball (706) for knocking the plate member (701) to cause it to vibrate and shake off dust adhering to the filter area (702) when the push member (705) is reset.

7. The exhaust gas recirculation self-cleaning premixing device of a marine methanol engine according to claim 6, characterized in that: An elastic rubber ring is provided at the air inlet (5) port, and the filter area (702) is in extrusion contact with the elastic rubber ring.

8. The exhaust gas recirculation self-cleaning premixing device of a marine methanol engine according to claim 4, characterized in that: The premixing device further comprises a power assembly (8), the power assembly (8) comprising a wind wheel (801) rotatably arranged in the discharge pipe (1) and a driven shaft (803) rotatably arranged, a first transmission component (209) is arranged between the discharge pipe (1) and the mesh cylinder (202), and the first transmission component (209) is a reduction transmission structure.

9. The exhaust gas recirculation self-cleaning premixing device of a marine methanol engine according to claim 8, characterized in that: A third transmission component (802) is provided between the wind wheel (801) and the driven shaft (803), a shaft body (711) is provided at the center of the plate (701), and a second transmission component (712) is provided between the shaft body (711) and the driven shaft (803).

10. The exhaust gas recirculation self-cleaning premixing device of a marine methanol engine according to claim 9, characterized in that: The shaft (711) is also evenly provided with a plurality of fan blades (713) in the circumferential direction, which are used to generate airflow when the shaft (711) rotates so that dust falling off the filter area (702) is kept away from the air inlet (5) port.

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