CN107530609B - Demister unit and EGR system - Google Patents
Demister unit and EGR system Download PDFInfo
- Publication number
- CN107530609B CN107530609B CN201680019611.8A CN201680019611A CN107530609B CN 107530609 B CN107530609 B CN 107530609B CN 201680019611 A CN201680019611 A CN 201680019611A CN 107530609 B CN107530609 B CN 107530609B
- Authority
- CN
- China
- Prior art keywords
- exhaust gas
- demister
- receiving member
- baffle
- flow path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
Abstract
A demister unit and an EGR system are provided with: a casing (51), wherein the casing (51) is hollow and has an inlet (61) and an outlet (62) for exhaust gas; a baffle plate (52), wherein the baffle plate (52) is arranged in the shell (51) opposite to the inlet part (61) so as to form a curved upstream side flow path (63); a demister body (55) that is disposed in the casing (51) at a position on the downstream side in the flow direction of the exhaust gas from the upstream-side flow path (63) and that removes mist from the exhaust gas; and a receiving member (56), wherein the receiving member (56) receives liquid drops generated by the collision of the exhaust gas with the baffle (52), thereby preventing the mist removed from the fluid from being taken into the fluid again, and improving the mist removal efficiency.
Description
Technical Field
The present invention relates to a demister unit for removing mist from exhaust gas and an EGR system using the demister unit.
Background
Since the exhaust gas discharged from the boiler through the wet exhaust gas treatment device contains mist, it is necessary to remove the mist contained in the exhaust gas. As a structure for removing mist contained in exhaust gas, there are a mist eliminator and a mist eliminator, and the following patent document 1, for example, describes a structure. In the wet-type exhaust gas treatment device described in patent document 1, exhaust gas from a boiler is introduced into a dust removal tower through an inlet flue, and after soot in the exhaust gas is removed, mist in the exhaust gas is removed when the exhaust gas passes through a demister of the dust removal tower.
Further, as a structure for reducing NOx in the exhaust gas, there is Exhaust Gas Recirculation (EGR). This EGR returns a part of exhaust gas discharged from a combustion chamber of the internal combustion engine to the combustion chamber as combustion gas. Therefore, the oxygen concentration of the combustion gas is reduced, and the combustion speed, which is the reaction between the fuel and oxygen, is delayed, whereby the combustion temperature can be lowered, and the amount of NOx generated can be reduced.
Patent document 1: japanese patent laid-open publication No. H08-131764
The mist contained in the exhaust gas is removed by the demister causing the exhaust gas introduced from the inlet to collide with the baffle plate. At this time, the exhaust gas passes below the baffle after the mist is removed by the collision with the baffle. On the other hand, the mist contained in the exhaust gas collides with the baffle plate to become droplets, and falls downward along the baffle plate. Therefore, when the exhaust gas from which the mist is removed passes below the baffle, the exhaust gas is caught in liquid droplets falling down the baffle, resulting in the following problems: the exhaust gas is taken into the mist again, and the amount of mist contained increases.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object thereof is to provide a demister unit and an EGR system that suppress the mist removed from a fluid from being taken into the fluid again, thereby improving mist removal efficiency.
Means for solving the problems
A demister unit according to the present invention for achieving the above object is characterized by comprising: a housing having a hollow shape, an inlet portion and an outlet portion for a fluid; a baffle plate that is disposed in the housing so as to face the inlet portion and along the plumb direction, thereby forming a curved flow path; a demister support plate having one end portion fixed in close contact with the rear wall portion of the casing and left and right side portions fixed in close contact with the left and right side wall portions of the casing in the casing, the demister support plate being arranged in the horizontal direction closer to the outlet portion side than the baffle plate, and a demister body arranged on the demister support plate at a position closer to the downstream side in the fluid flow direction than the curved flow path in the casing and removing mist from the fluid; and a receiving part that receives droplets generated by collision of the fluid with the baffle.
Therefore, the fluid introduced into the housing from the inlet portion collides with the baffle plate, and the mist contained therein is formed into droplets and adheres to the baffle plate. The liquid droplets adhered to the baffle plate flow down through the flat surface portion of the baffle plate by their own weight and are received by the receiving member. On the other hand, the fluid from which a part of the mist is removed flows through the curved flow path, and the mist is further removed by a centrifugal force, and finally the remaining mist is removed by the demister main body. Here, since the liquid droplets generated by the collision of the fluid with the baffle plate flow down through the flat surface portion of the baffle plate by their own weight and are received by the receiving member, the fluid flowing through the curved flow path does not take in the liquid droplets again as mist, and the mist removed from the fluid can be prevented from being taken in again to the fluid, thereby improving the mist removal efficiency.
In the demister unit according to the present invention, the receiving member is a receiving flow path along the baffle in the left-right direction.
Therefore, the liquid droplets adhering to the baffle plate flow down through the flat surface portion of the baffle plate by their own weight and are received by the receiving flow path, and the received liquid droplets can be caused to flow through the receiving flow path and be collected at a predetermined portion.
In the demister unit according to the present invention, the receiving flow path has a bottom portion and a side portion provided along a flow direction of the liquid droplets.
Therefore, by configuring the receiving flow path with the bottom portion and the side portion, it is possible to appropriately receive without causing a large amount of liquid droplets to overflow from the receiving flow path.
In the demister unit according to the present invention, the receiving flow path is provided so as to be inclined downward toward an inner wall surface of the casing.
Therefore, by inclining the receiving flow path downward toward the inner wall surface of the casing, the received liquid droplets can be appropriately discharged toward the inner wall surface side of the casing through the receiving flow path.
In the demister unit of the present invention, the receiving member is provided at a flat surface portion of the baffle plate that is opposite to the inlet portion.
Therefore, by providing the receiving member in the planar portion of the baffle plate that opposes the inlet portion, it is possible to appropriately receive, by the receiving member, the liquid droplets generated by the collision with the planar portion of the baffle plate.
In the demister unit according to the present invention, the receiving member is provided at a lower portion of the baffle plate in the vertical direction.
Therefore, by providing the receiving member at the lower portion of the baffle plate in the vertical direction, the liquid droplets generated by the collision with the flat surface portion of the baffle plate can be received more effectively by the receiving member at the lower portion of the baffle plate.
In the demister unit according to the present invention, the receiving member is provided in a plurality of rows in the vertical direction.
Therefore, by providing a plurality of receiving members in parallel in the vertical direction, it is possible to reliably receive the liquid droplets generated by the collision with the flat surface portion of the baffle.
In the demister unit according to the present invention, the demister unit is provided with a drainage flow path for allowing the liquid droplets received by the receiving member to flow to a reservoir portion in a lower portion of the casing.
Therefore, the liquid droplets adhering to the baffle plate flow down through the flat surface portion of the baffle plate by their own weight and are received by the receiving member, and the liquid droplets received by the receiving member flow to the storing portion through the drainage member, and the liquid droplets can be appropriately drained to prevent the liquid droplets from coming into contact with the fluid flowing through the curved member.
In the demister unit according to the present invention, the drainage passage is provided between an end of the receiving member and an inner wall surface of the casing.
Therefore, by providing the drain flow path in the vicinity of the inner wall surface of the housing, it is possible to prevent the generated liquid droplets from coming into contact with the fluid flowing in the curved flow path, and to simplify the structure.
In the demister unit according to the present invention, the drain flow passage is a pipe portion that communicates from the water collecting portion of the receiving member to the storage portion.
Therefore, by providing the drain passage as a pipe portion communicating from the water collecting portion of the receiving member to the reservoir portion, the generated droplets can be caused to flow to the reservoir portion by the pipe portion, and the generated droplets are prevented from coming into contact with the fluid flowing through the curved passage.
Further, an EGR system according to the present invention includes: an exhaust gas recirculation path that recirculates a part of exhaust gas discharged from an engine to the engine as a part of combustion gas; a scrubber that removes harmful substances by spraying water to the exhaust gas flowing in the exhaust gas recirculation path; and a demister unit into which the exhaust gas discharged from the scrubber is introduced.
Therefore, when a part of the exhaust gas discharged from the engine passes through the exhaust gas recirculation path, water is sprayed to the exhaust gas flowing through the exhaust gas recirculation path by the scrubber to remove harmful substances, and the mist contained in the exhaust gas is removed by the demister unit and then supplied to the engine. In this case, in the demister unit, the mist contained in the exhaust gas collides with the baffle plate and is deposited on the baffle plate as droplets, and the droplets flow down through the flat surface portion of the baffle plate by their own weight and are received by the receiving member. Therefore, the fluid flowing through the curved flow path does not take in the droplets again as mist, and the mist removed from the fluid can be suppressed from being taken in again to the fluid, thereby improving the mist removal efficiency.
Effects of the invention
According to the demister unit and the EGR system of the present invention, it is possible to suppress the mist removed from the fluid from being taken into the fluid again and to improve the mist removal efficiency.
Drawings
Fig. 1 is a schematic diagram showing a diesel engine having an EGR system to which a demister unit of a first embodiment is applied.
Fig. 2 is a schematic configuration diagram showing an EGR system according to the first embodiment.
Fig. 3 is a longitudinal sectional view showing a demister unit of the first embodiment.
Fig. 4 is an IV-IV sectional view of fig. 3 showing a horizontal section of the demister unit.
FIG. 5 is a V-V cross-sectional view of FIG. 3 showing an inlet portion of a demister unit.
Fig. 6 is a cross-sectional view showing the receiving flow path.
FIG. 7-1 is a cross-sectional view showing a modification of the receiving channel.
FIG. 7-2 is a cross-sectional view showing a modification of the receiving channel.
Fig. 7-3 is a cross-sectional view showing a modification of the receiving channel.
Fig. 7-4 are cross-sectional views showing modifications of the receiving channel.
Fig. 8 is a longitudinal sectional view showing a modification of the demister unit according to the first embodiment.
Fig. 9 is a longitudinal sectional view showing a modification of the demister unit of the first embodiment.
Fig. 10 is a longitudinal sectional view showing an inlet portion of a demister unit of a second embodiment.
Fig. 11 is a sectional view showing the receiving flow path.
Fig. 12 is a vertical cross-sectional view showing a modification of the demister unit of the second embodiment.
Fig. 13 is a vertical sectional view showing an inlet portion of a demister unit of a third embodiment.
Fig. 14 is a longitudinal sectional view showing a demister unit according to a fourth embodiment.
FIG. 15 is a longitudinal cross-sectional view showing an inlet portion of a demister unit.
Detailed Description
Preferred embodiments of a demister unit and an EGR system according to the present invention will be described in detail below with reference to the accompanying drawings. The present invention is not limited to the present embodiment, and when a plurality of embodiments are provided, the present invention includes a configuration in which the respective embodiments are combined.
[ first embodiment ]
Fig. 1 is a schematic diagram showing a diesel engine having an EGR system to which a demister unit of a first embodiment is applied, and fig. 2 is a schematic configuration diagram showing the EGR system of the first embodiment.
In the first embodiment, as shown in fig. 1, a marine diesel engine 10 includes an engine body 11, a supercharger 12, and an EGR system 13.
As shown in fig. 2, although not shown in the drawings, the engine body 11 is a propulsion internal combustion engine (main internal combustion engine) that rotationally drives a propulsion propeller via a propeller shaft. The engine body 11 is a one-way scavenging diesel engine and a two-stroke diesel engine, and the flow of intake and exhaust gases in the cylinder is set in one direction from the bottom to the top, so that no exhaust gas remains. The engine main body 11 includes: a plurality of cylinders (combustion chambers) 21 for moving the pistons up and down; a scavenging chamber 22 communicating with each cylinder 21; and an exhaust manifold 23 communicating with each cylinder 21. Further, scavenging ports 24 are provided between the cylinders 21 and the scavenging chambers 22, and exhaust flow paths 25 are provided between the cylinders 21 and the exhaust manifold 23. In the engine body 11, the intake air path G1 is connected to the scavenging chamber 22, and the exhaust air path G2 is connected to the exhaust port 23.
The supercharger 12 is configured to integrally rotate by coupling the compressor 31 and the turbine 32 via a rotary shaft 33. In the supercharger 12, the turbine 32 is rotated by the exhaust gas discharged from the exhaust passage G2 of the engine body 11, the rotation of the turbine 32 is transmitted by the rotary shaft 33 to rotate the compressor 31, and the compressor 31 compresses air and/or recirculated gas and supplies the air and/or recirculated gas from the air supply passage G1 to the engine body 11. The compressor 31 is connected to an intake path G6 through which air is taken in from the outside (atmosphere).
The supercharger 12 is connected to an exhaust passage G3 for discharging exhaust gas that rotates the turbine 32, and the exhaust passage G3 is connected to a chimney (draft tube), not shown. Further, an EGR system 13 is provided between the exhaust passage G3 and the intake passage G1.
The EGR system 13 has; exhaust gas recirculation paths G4, G5, G7, scrubber 42, demister unit 14, and EGR blower (blower) 47. The EGR system 13 mixes a part of the exhaust gas discharged from the marine diesel engine 10 with air, and then, the mixture is compressed by a supercharger and recirculated to the marine diesel engine 10 as combustion gas, thereby suppressing the generation of NOx due to combustion. In addition, although a part of the exhaust gas is extracted from the downstream side of the turbine 32 here, a part of the exhaust gas may be extracted from the upstream side of the turbine 32.
One end of the exhaust gas recirculation path G4 is connected to a middle portion of the exhaust path G3. The exhaust gas recirculation path G4 is provided with an EGR inlet valve (opening/closing valve) 41A, and the other end is connected to the scrubber 42. The EGR inlet valve 41A opens and closes the exhaust gas recirculation path G4, thereby opening/closing the exhaust gas branched from the exhaust path G3 to the exhaust gas recirculation path G4. Further, the EGR inlet valve may be a flow rate adjustment valve to adjust the flow rate of the exhaust gas passing through the exhaust gas recirculation path G4.
The scrubber 42 is a venturi type scrubber, and includes: a hollow throat portion 43; a venturi portion 44 into which exhaust gas is introduced; and an amplifying section 45 that returns to the original flow rate step by step. The scrubber 42 has a water jet unit 46, and the water jet unit 46 jets water to the exhaust gas introduced into the venturi 44. The scrubber 42 is connected to an exhaust gas recirculation path G5, and the exhaust gas recirculation path G5 discharges exhaust gas from which harmful substances such as fine Particles (PM) such as SOx and coal dust have been removed and drain water containing the harmful substances. In the present embodiment, a venturi type scrubber is used, but the present invention is not limited to this structure.
The exhaust gas recirculation path G5 is provided with the demister unit 14 and the EGR blower 47.
The demister unit 14 separates exhaust gas and drain water from which harmful substances have been removed by water injection. The demister unit 14 is provided with a drain water circulation path W1 for circulating drain water to the water jet part 46 of the scrubber 42. The drain water circulation path W1 is provided with a holding tank 49 for temporarily storing drain water and a pump 50.
The EGR blower 47 guides the exhaust gas in the scrubber 42 from the exhaust gas recirculation path G5 to the demister unit 14.
One end of the exhaust gas recirculation path G7 is connected to the EGR blower 47, and the other end is connected to the compressor 31 via a mixer (not shown), and the EGR blower 47 feeds the exhaust gas to the compressor 31. The exhaust gas recirculation path G7 is provided with an EGR outlet valve (opening/closing valve or flow rate adjustment valve) 41B. The air from the intake passage G6 and the exhaust gas (recirculated gas) from the exhaust gas recirculation passage G7 are mixed in a mixer to generate combustion gas. The mixer may be provided separately from the muffler, or the muffler may be configured to have a function of mixing the exhaust gas and the air without providing a separate mixer. The supercharger 12 can supply the combustion gas compressed by the compressor 31 to the engine main body 11 from the intake passage G1, and an air cooler (cooler) 48 is provided in the intake passage G1. The air cooler 48 cools the combustion gas by exchanging heat between the combustion gas compressed by the compressor 31 to have a high temperature and the cooling water.
As shown in fig. 3 to 5, the demister unit 14 includes a housing 51, a baffle plate 52, a perforated plate 53, a demister support plate 54, a demister body 55, and a receiving member 56.
The housing 51 is a hollow rectangular container forming an inner space. That is, the case 51 is formed in a box shape by the ceiling portion 51a, the left and right side wall portions 51b, 51c, the bottom portion 51d, the upstream side wall portion 51e, and the downstream side wall portion 51 f. The casing 51 has an inlet 61 for introducing exhaust gas and drain water formed above one end (right end in fig. 3), and an outlet 62 for discharging exhaust gas (fluid) formed above the other end (left end in fig. 3). The housing 51 is provided on the exhaust gas recirculation path G5.
The baffle 52 is disposed in the vertical direction in the housing 51 so as to face the inlet 61, thereby forming an upstream flow path 63 as a curved flow path. The baffle 52 is formed of a flat plate through which exhaust gas and liquid droplets cannot pass, and has an upper end portion fixed in close contact with the ceiling portion 51a of the casing 51, left and right side portions fixed in close contact with left and right side wall portions 51b, 51c of the casing 51, and an upstream flow path 63 provided below a lower end portion.
In this case, the distance from the inlet portion 61 to the flat surface portion 52a of the baffle 52 in the housing 51 is set to be equal to or less than the inner diameter of the inlet portion 61. Therefore, the exhaust gas introduced from the inlet 61 into the housing 51 flows into the upstream flow path 63 after colliding with the baffle. That is, the exhaust gas introduced from the inlet 61 into the housing 51 flows downward in the vertical direction by the baffle plate, and then turns into a horizontally curved flow. The flow passage area below the baffle 52 is set to be larger than the flow passage area when the fluid is introduced from the inlet 61 into the housing 51. Therefore, the exhaust gas introduced from the inlet portion 61 into the housing 51 does not accelerate any more when flowing below the baffle plate 52.
In the housing 51, a perforated plate 53 is horizontally fixed at a lower portion. The perforated plate 53 is formed of a flat plate having a plurality of through holes (not shown) formed therein so that the exhaust gas and the liquid droplets can pass therethrough. The porous plate 53 is horizontally disposed at a position above the bottom portion 51d of the case 51 by a predetermined height, and the outer peripheral portion is fixed in close contact with the side wall portions 51b, 51c and the front and rear wall portions 51e, 51f of the case 51, thereby forming a reservoir 64 between the porous plate 53 and the bottom portion 51 d. The storage unit 64 is provided with a drain passage 64a at a lower portion.
The demister support plate 54 is horizontally disposed above the perforated plate 53 at a predetermined height at a position closer to the outlet portion 62 than the baffle plate 52. The demister support plate 54 is formed of a flat plate through which exhaust gas and liquid droplets cannot pass, and has an upstream flow path 63 provided therein, with one end portion fixed in close contact with the rear wall portion 51f of the casing 51, left and right side portions fixed in close contact with the left and right side wall portions 51b and 51c of the casing 51, and the other end portion separated from the baffle plate 52 by a predetermined distance. In this case, the lower end of the baffle plate 52 is located below the lower surface of the demister support plate 54 in the vertical direction.
The demister main body 55 is disposed in the casing 51 at a position downstream of the upstream flow channel 63 in the flow direction of the exhaust gas, and removes mist from the exhaust gas. Although not shown, the demister body 55 is provided with a flow path that is bent a plurality of times and through which exhaust gas can pass, and is configured as a plate-like body along the vertical direction as a whole. The demister body 55 is provided at the other end of the demister support plate 54, and has an upper end portion closely attached to the ceiling portion 51a of the casing 51 and left and right side portions closely attached to the left and right side wall portions 51b and 51c of the casing 51.
The demister body 55 is disposed opposite to the baffle 52, and an upstream side of the demister body 55 is an upstream side flow passage 63 and a downstream side of the demister body 55 is a downstream side flow passage 65. That is, the upstream flow path 63 is partitioned by the front wall 51e of the casing 51, the side walls 51b and 51c, the baffle 52, the porous plate 53, and the lower surface of the demister support plate 54, and the downstream flow path 65 is partitioned by the side walls 51b and 51c of the casing 51, the rear wall 51f, and the upper surface of the demister support plate 54. Therefore, the exhaust gas introduced into the casing 51 from the inlet 61 passes through the upstream side flow path 63, reaches the demister main body 55, passes through the downstream side flow path 65, and is discharged from the outlet 62.
The receiving member 56 receives liquid droplets generated by the collision of the exhaust gas introduced into the housing 51 from the inlet portion 61 with the baffle plate 52. The receiving member 56 is provided in the flat surface portion 52a of the baffle plate 52 opposite to the inlet portion 61. The receiving member 56 is provided on the flat surface portion 52a of the baffle plate 52 so as to be positioned vertically below the inlet portion 61.
The receiving member 56 is provided along the left-right direction on the flat surface portion 52a of the shutter 52, and is composed of 2 receiving member main bodies 66, 67. The receiving member body 66 extends from a middle position of the flat surface portion 52a of the shutter 52 in the left-right direction toward the one side wall portion 51b, and the receiving member body 67 extends from a middle position of the flat surface portion 52a of the shutter 52 in the left-right direction toward the other side wall portion 51 c. The receiving member bodies 66 and 67 are provided to be inclined downward toward the side wall portions 51b and 51c of the housing 51.
As shown in detail in fig. 6, the receiving member 56 (receiving member bodies 66, 67) is constituted by a bottom portion 68 and a side portion 69 provided along the flow direction of the liquid droplets. One side portion of the bottom portion 68 is horizontally closely fixed to be orthogonal to the flat surface portion 52a of the baffle plate 52, and the lower end portion of the side portion 69 is vertically closely fixed to be orthogonal to the other side portion of the bottom portion 68. Therefore, the receiving member 56 (receiving member bodies 66, 67) forms a receiving flow path 70 by the flat surface portion 52a, the bottom portion 68, and the side portion 69 of the shutter 52, the receiving flow path 70 having an コ -shaped cross section and receiving along the left-right direction of the shutter 52.
Therefore, the exhaust gas introduced into the housing 51 from the inlet 61 collides with the baffle 52 to generate droplets, and the droplets fall downward along the flat surface portion 52a of the baffle 52, so that the receiving member 56 can receive the droplets through the receiving flow path 70.
As shown in fig. 4 and 5, drain passages 71, 72 are provided for allowing the droplets received by the receiving passage 70 of the receiving member 56 to flow to the reservoir 64 of the housing 51. The receiving member bodies 66 and 67 extend from the center of the inlet portion 61 in the left-right direction toward the left and right side walls 51b and 51c, and have gaps between the front end portions and the left and right side walls 51b and 51c, whereby the drainage passages 71 and 72 are provided therein. Therefore, the liquid droplets received by the receiving flow path 70 of the receiving member 56 flow downward in the direction of inclination of the receiving flow path 70, and can therefore flow from the drain flow paths 71, 72 to the reservoir 64.
As shown in fig. 3, a hanging-down plate 57 is provided below the demister main body 55. The hanging-down plate 57 is formed of a flat plate through which exhaust gas and liquid droplets cannot pass, and is arranged to hang down from the lower surface of the demister supporting plate 54 with its upper end fixed in close contact with the lower surface of the demister supporting plate 54. The hanging plate 57 is disposed along the same horizontal plane as the end of the demister support plate 54 without a step. In this case, the lower end of the hanging plate 57 is located at the same position as the lower end of the baffle plate 52 in the vertical direction, or is located above the lower end of the baffle plate 52 in the vertical direction. Therefore, the exhaust gas flowing through the upstream flow path 63 is guided by the hanging plate 57 from the lower region of the demister support plate 54 upward toward the upstream surface of the demister main body 55.
In the above description, the receiving member 56 (the receiving member bodies 66 and 67) has the receiving flow path 70, and the receiving flow path 70 is received in the コ -shaped cross section by the flat surface portion 52a, the bottom portion 68, and the side portion 69 of the shutter 52, but the present invention is not limited to this configuration. FIGS. 7-1 to 7-4 are cross-sectional views showing modifications of the receiving channel.
As shown in fig. 7-1, the receiving part 81 is constituted by a bottom 82 provided along the flow direction of the liquid droplets. The bottom 82 is fixed in close contact horizontally so that one side thereof is orthogonal to the flat surface portion 52a of the baffle plate 52. Therefore, the receiving member 81 forms a receiving flow path 83 along the left-right direction of the baffle plate 52 by the flat surface portion 52a and the bottom portion 82 of the baffle plate 52. Also, as shown in fig. 7-2, the receiving member 84 is constituted by a bottom portion 85 provided along the flow direction of the liquid droplets. One end of the bottom portion 85 is fixed to the flat surface portion 52a of the baffle plate 52, and the other end is inclined upward from the horizontal, and the angle formed by the flat surface portion 52a and the upper surface of the bottom portion 85 is set to a predetermined angle (acute angle). Therefore, the receiving member 84 forms a receiving flow path 86 along the left-right direction of the baffle plate 52 by the flat surface portion 52a and the bottom portion 85 of the baffle plate 52.
As shown in fig. 7-3, the receiving member 87 is constituted by a curved bottom portion 88 disposed along the flow direction of the liquid droplets. The curved bottom portion 88 is fixed in close contact with one side portion thereof so as to be orthogonal to the flat surface portion 52a of the baffle plate 52, and extends so as to have the other side portion thereof curved upward. Therefore, the receiving member 87 forms a receiving flow path 89 along the left-right direction of the baffle 52 by the flat surface portion 52a and the curved bottom portion 88 of the baffle 52. And, as shown in fig. 7-4, the receiving member 90 is constituted by a concave portion 91 provided along the flow direction of the liquid droplets. The concave portion 91 is formed by bending the baffle 52, and the receiving flow path 92 along the left-right direction of the baffle 52 is formed by the concave portion 91. In this case, it is preferable that flat surface portion 52b below recess 91 is arranged on the right side, i.e., on the inlet portion (see fig. 3) side, of flat surface portion 52a above recess 91.
In the above description, the receiving member 56 is configured by 2 receiving member bodies 66 and 67, and the receiving member bodies 66 and 67 are inclined downward toward the side wall portions 51b and 51c of the housing 51. Fig. 8 and 9 are vertical sectional views showing modifications of the demister unit of the first embodiment.
As shown in fig. 8, the receiving member 101 receives droplets generated by the collision of the exhaust gas introduced into the housing 51 from the inlet portion 61 with the baffle plate 52. The receiving member 101 is provided in a flat surface portion 52a of the shutter 52 opposed to the inlet portion 61. The receiving member 101 is provided on the flat surface portion 52a of the shutter 52 so as to be positioned vertically below the inlet portion 61. The receiving member 101 is provided along the left-right direction on the flat surface portion 52a of the shutter 52, extends from one side wall portion 51b toward the other side wall portion 51c of the housing 51, and is inclined downward toward the other side wall portion 51 c.
Further, a drain flow path 102 is provided for allowing the droplets received by the receiving member 101 to flow to the reservoir 64 of the housing 51. One end of the receiving member 101 is closely attached to the side wall 51b of the housing 51, but a gap is provided between the other end and the side wall 51c, and a drainage passage 102 is provided therein.
Therefore, the exhaust gas introduced into the housing 51 from the inlet 61 collides with the baffle plate 52 to generate droplets, and the droplets fall downward along the flat surface portion 52a of the baffle plate 52, so that the receiving member 101 can receive the droplets. The liquid droplets received by the receiving member 101 flow downward in the direction of inclination of the receiving member 101, and therefore can flow from the drain passage 102 to the reservoir 64.
As shown in fig. 9, the receiving member 111 receives liquid droplets generated by collision of the exhaust gas introduced into the housing 51 from the inlet portion 61 with the baffle 52. The receiving member 111 is provided in the flat surface portion 52a of the baffle plate 52 opposite to the inlet portion 61. The receiving member 111 is provided on the flat surface portion 52a of the shutter 52 so as to be positioned vertically below the inlet portion 61. The receiving member 111 is constituted by 3 receiving member bodies 112, 113, and 114, and is provided along the left-right direction on the flat surface portion 52a of the shutter 52. The receiving member main bodies 112, 113, and 114 are disposed so as to be offset in the left-right direction (horizontal direction) of the baffle plate 52 with a predetermined interval therebetween in the vertical direction, and a part thereof overlaps in the vertical direction. The receiving member bodies 112, 113, and 114 are provided so as to be inclined downward from one side wall portion 51b toward the other side wall portion 51c of the housing 51.
Further, a drain flow path 115 is provided for allowing the droplets received by the receiving member 111 to flow to the reservoir 64 of the housing 51. One end of the receiving member main body 112 of the receiving member 111 is closely attached to the side wall 51b of the housing 51, but a gap is provided between the other end of the receiving member main body 114 and the side wall 51c, and a drainage passage 115 is provided therein.
Therefore, the exhaust gas introduced into the housing 51 from the inlet 61 collides with the baffle plate 52 to generate droplets, and the droplets fall downward along the flat surface portion 52a of the baffle plate 52, so that the receiving member 111 can receive the droplets. That is, the liquid droplets flowing down the flat surface portion 52a of the baffle 52 can be received by the receiving member main bodies 112, 113, and 114, flow through the receiving member main bodies 112, 113, and 114 in order, and flow from the drain flow path 115 to the reservoir 64.
The following describes the operation of the EGR system according to the first embodiment. In the engine body 11, when combustion air is supplied from the scavenging chamber 22 into the cylinder 21, the combustion air is compressed by the piston, and fuel is injected into the high-temperature air, whereby the air is naturally ignited and burned. The generated combustion gas is discharged as an exhaust gas from the exhaust manifold 23 to the exhaust path G2. The exhaust gas discharged from the engine body 11 is discharged to the exhaust path G3 after rotating the turbine 32 in the supercharger 12, and the total amount thereof is discharged to the outside from the exhaust path G3 when the EGR inlet valve 41A is closed.
On the other hand, when the EGR inlet valve 41A is open, a part of the exhaust gas flows from the exhaust path G3 to the exhaust recirculation path G4. The exhaust gas flowing into the exhaust gas recirculation path G4 is cleaned of harmful substances such as Sox and soot contained therein by the scrubber 42. That is, when the exhaust gas passes through the venturi portion 44 at a high speed, the scrubber 42 cools the exhaust gas by water injected from the water injection portion 46, and drops and removes Particles (PM) such as Sox and soot together with the water. Then, water including Sox, coal dust, and the like flows into the demister unit 14 together with the EGR gas.
The exhaust gas from which harmful substances are removed by the scrubber 42 is discharged to the gas discharge path G5, and after scrubber washing water is separated by the demister unit 14, is supplied to the supercharger 12 through the exhaust gas supply path G7. The exhaust gas is mixed with the air taken in through the intake path G6 to become combustion gas, and the combustion gas is cooled by the air cooler 48 after passing through the compressor 31 of the supercharger 12, and is supplied to the engine main body 11 through the intake path G1.
Here, the processing of the demister unit 14 will be described. As shown in fig. 3 to 5, the exhaust gas introduced from the inlet portion 61 into the housing 51 collides with the flat surface portion 52a of the baffle 52 positioned on the front side, spreads along the flat surface portion 52a of the baffle 52, and the mist contained therein turns into droplets and adheres to the flat surface portion 52a of the baffle 52. Then, the liquid droplets adhering to the flat surface portion 52a of the baffle 52 flow downward along the flat surface portion 52a by their own weight, and are received by the receiving member 56. The droplets received by the receiving member 56 are accumulated in the receiving flow path 70, and flow toward the side surface portions 51b and 51c of the housing 51 by the inclination of the receiving member bodies 66 and 67. The liquid droplets that have flowed to the side surface portions 51b and 51c of the housing 51 are discharged to the reservoir 64 through the discharge flow paths 71 and 72, and are discharged to the outside through the discharge flow path 64 a.
On the other hand, the exhaust gas from which a part of the mist has been removed passes through the flat surface portion 52a of the baffle 52, the ceiling portion 51a, the side wall portions 51b and 51c, and the front wall portion 51e of the housing 51, becomes a downward fluid, and flows into the upstream flow path 63. The exhaust gas flowing into the upstream side flow path 63 passes through the perforated plate 53 to become a horizontal fluid, and passes through the hanging plate 57 to become an upward fluid, and reaches the demister main body 55. At this time, the exhaust gas flowing through the upstream flow path 63 passes below the baffle plate 52, but the droplets adhering to the baffle plate 52 are received by the receiving member 56 and drained from the drain flow paths 71 and 72 to the reservoir 64, and therefore do not fall down to the upstream flow path 63. Therefore, the exhaust gas flowing through the upstream flow path 63 can be prevented from contacting water, and the mist removed from the exhaust gas can be prevented from being taken into the exhaust gas again. Then, the exhaust gas flows through the curved upstream flow path 63, and the mist is removed by centrifugal force. When the exhaust gas passes through the demister main body 55, the remaining mist aggregates to become droplets, and falls down to the storage unit 64. Then, the exhaust gas from which the mist is removed passes through the downstream flow path 65 and is discharged from the outlet 62.
In this way, the demister unit of the first embodiment is provided with a casing 51, a baffle 52, a demister body 55, and a receiving member 56, the casing 51 having a hollow shape and having an inlet portion 61 and an outlet portion 62 of the exhaust gas, the baffle 52 being disposed in the casing 51 so as to face the inlet portion 61 and forming a curved upstream side flow passage 63, the demister body 55 being disposed in the casing 51 at a position on the downstream side in the flow direction of the exhaust gas from the upstream side flow passage 63 and removing mist from the exhaust gas, and the receiving member 56 receiving liquid droplets generated by collision of the exhaust gas with the baffle 52.
Therefore, since the droplets generated by the collision of the exhaust gas with the baffle plate 52 flow down through the flat surface portion 52a of the baffle plate 52 by their own weight and are received by the receiving member 56, the exhaust gas flowing through the upstream side flow passage 63 does not take in the droplets again as mist, and the mist removed from the exhaust gas is suppressed from being taken in again into the exhaust gas, with the result that the mist removal efficiency can be improved.
In the demister unit of the first embodiment, the receiving member 56 is provided with a receiving flow path 70 along the left-right direction of the baffle 52. Therefore, the droplets adhering to the baffle 52 flow down through the flat surface portion 52a of the baffle 52 by their own weight and are received by the receiving flow path 70, and the received droplets can be collected to a predetermined portion by the receiving flow path 70.
In the demister unit of the first embodiment, as the receiving flow path 56, a bottom portion 68 and a side portion 69 are provided along the flow direction of the liquid droplets. Therefore, it can be appropriately received without causing a large amount of liquid droplets to overflow from the receiving flow path 70.
In the demister unit of the first embodiment, the receiving flow path 70 is inclined downward toward the side walls 51b and 51c of the casing 51. Therefore, the received liquid droplets can be appropriately discharged toward the side wall portions 51b and 51c of the housing 51 along the oblique direction of the receiving flow path 70.
In the demister unit of the first embodiment, the receiving member 56 is provided in the flat surface portion 52a of the baffle plate 52 that faces the inlet portion 61. Therefore, the liquid droplets generated by the collision with the flat surface portion 52a of the baffle plate 52 can be appropriately received by the receiving member 56.
The demister unit of the first embodiment is provided with drain passages 71, 72 for allowing the droplets received by the receiving passage 70 to flow to the reservoir 64 in the lower portion of the casing 51. Therefore, the droplets adhering to the baffle plate 52 flow down through the flat surface portion 52a of the baffle plate 52 by their own weight and are received by the receiving flow path 70, and the droplets received by the receiving flow path 70 flow to the reservoir 64 through the drainage flow paths 71 and 72, and the droplets can be appropriately discharged to suppress the droplets from contacting the exhaust gas flowing through the upstream flow path 63.
In the demister unit of the first embodiment, the drainage channels 71, 72 are provided between the end portions of the receiving channel 70 and the side wall portions 51b, 51c of the casing 51. Therefore, by draining the droplets along the side wall portions 51b, 51c of the housing 51, the generated droplets can be suppressed from contacting the exhaust gas flowing in the upstream side flow path 63, and the structure can be simplified.
Further, in the EGR system of the first embodiment, an exhaust gas recirculation path G4, a scrubber 42, and a demister unit 14 are provided, the exhaust gas recirculation path G4 recirculates a part of the exhaust gas discharged from the engine body 11 to the engine body as a part of the combustion gas, the scrubber 42 removes harmful substances by spraying water to the exhaust gas flowing through the exhaust gas recirculation path G4, and the demister unit 14 introduces the exhaust gas discharged from the scrubber 42.
Therefore, in the demister unit 14, the droplets generated by the collision of the exhaust gas with the baffle 52 flow down through the flat surface portion 52a of the baffle 52 by their own weight and are received by the receiving member 56, and therefore the exhaust gas flowing through the upstream side flow passage 63 does not take in the droplets again as mist, and the mist removed from the exhaust gas is suppressed from being taken in again into the exhaust gas, and as a result, the mist removal efficiency can be improved.
[ second embodiment ]
Fig. 10 is a vertical sectional view showing an inlet portion of a demister unit of the second embodiment, fig. 11 is a sectional view showing a receiving flow path, and fig. 12 is a vertical sectional view showing a modification of the demister unit of the second embodiment. Note that the same reference numerals are given to members having the same functions as those of the above-described embodiment, and detailed description thereof is omitted.
In the second embodiment, as shown in fig. 10, the demister unit 120 includes: the demister includes a housing 51, a baffle 52, a perforated plate 53, a demister support plate 54, a demister body 55, and a plurality of receiving members 121, 122. The housing 51, the baffle 52, the perforated plate 53, the demister support plate 54, and the demister body 55 have the same configuration as in the first embodiment, and therefore, the description thereof is omitted.
A plurality of receiving flow paths 121 and 122 (2 in the present embodiment) are provided in parallel in the vertical direction. The receiving members 121 and 122 receive droplets generated by the collision of the exhaust gas introduced into the housing 51 from the inlet 61 with the baffle 52. The receiving members 121 and 122 are provided on the flat surface portion 52a of the baffle plate 52 facing the inlet portion 61 and below the inlet portion 61 in the vertical direction.
The receiving members 121 and 122 have substantially the same configuration as the receiving member 56 (see fig. 5) of the first embodiment, and are constituted by receiving member main bodies 123, 124, 125, and 126, and the receiving member main bodies 123, 124, 125, and 126 extend from the center position in the left-right direction of the inlet portion 61 toward the side wall portions 51b and 51c and are inclined downward. As shown in fig. 11, the receiving members 121 and 122 (receiving member bodies 123, 124, 125, and 126) are configured by bottom portions and side portions provided along the flow direction of the droplets, and form receiving flow paths 127 and 128 along the left-right direction of the baffle plate 52. The lower receiving member 122 is set to protrude from the flat surface portion 52a of the shutter 52 by a larger amount than the upper receiving member 121. That is, the lower receiving member 122 protrudes toward the inlet portion 61 more than the upper receiving member 121. As shown in fig. 10, drain passages 71, 72 are provided, and the drain passages 71, 72 flow the droplets received by the receiving passages 127, 128 of the receiving members 121, 122 to the reservoir 64 of the housing 51.
Therefore, the exhaust gas introduced from the inlet portion 61 into the housing 51 collides with the baffle plate 52 to generate droplets, and the droplets flow downward along the flat surface portion 52a of the baffle plate 52. At this time, the receiving members 121 and 122 can receive the droplets through the receiving flow paths 127 and 128. The droplets received by the receiving passages 127, 128 of the receiving members 121, 122 flow downward in the direction inclined to the receiving passages 127, 128, and therefore can flow from the drain passages 71, 72 to the reservoir 64.
In the above description, the receiving member 121 is constituted by 2 receiving member bodies 123 and 124, the receiving member 122 is constituted by 2 receiving member bodies 125 and 126, and the receiving member bodies 123, 124, 125 and 126 are inclined downward toward the side wall portions 51b and 51c of the housing 51, but the present invention is not limited to this configuration.
As shown in fig. 12, a plurality of receiving channels 131 and 132 (2 in the present embodiment) are provided in parallel in the vertical direction. Each of the receiving members 131, 132 receives droplets generated by collision of the baffle 52 with the exhaust gas introduced into the housing 51 from the inlet portion 61. The receiving members 131 and 132 are provided on the flat surface portion 52a of the baffle plate 52 facing the inlet portion 61 and below the inlet portion 61 in the vertical direction. The receiving members 131 and 132 are provided on the flat surface portion 52a of the shutter 52 in the left-right direction, extend from one side wall portion 51b toward the other side wall portion 51c of the housing 51, and are provided so as to be inclined downward toward the other side wall portion 51 c. Further, a drain flow path 102 is provided, and the drain flow path 102 causes the droplets received by the receiving members 131 and 132 to flow to the reservoir 64 of the housing 51.
Therefore, the exhaust gas introduced into the housing 51 from the inlet 61 collides with the baffle plate 52 to generate droplets, and the droplets flow downward along the flat surface portion 52a of the baffle plate 52. At this time, the receiving members 131 and 132 can receive the droplets. The droplets received by the receiving members 131 and 132 flow downward in the oblique direction, and therefore can flow from the drain passage 102 to the reservoir 64.
In the present embodiment, the projecting amounts of the upper receiving members 121, 131 and the lower receiving members 122, 132 from the flat surface portion 52a of the shutter 52 may be the same, and the projecting amount of the lower receiving members 122, 132 may be larger than the projecting amount of the upper receiving members 121, 131. The number of receiving means is not limited to 2, and may be 3 or more.
As described above, in the demister unit of the second embodiment, the plurality of receiving members 121 and 122(131 and 132) are provided side by side in the vertical direction, and the receiving members 121 and 122(131 and 132) receive the liquid droplets generated by the collision of the exhaust gas with the baffle 52.
Therefore, since the droplets generated by the collision of the exhaust gas with the baffle 52 flow down through the flat surface 52a of the baffle 52 by their own weight and are received by the receiving members 121 and 122(131 and 132), the exhaust gas flowing through the upstream flow path 63 does not take in the droplets again as mist, and the mist removed from the exhaust gas is prevented from being taken in again into the exhaust gas, and as a result, the mist removal efficiency can be improved. Further, by providing the plurality of receiving members 121 and 122(131 and 132) in parallel in the vertical direction, it is possible to reliably receive the liquid droplets generated by the collision of the exhaust gas with the flat surface portion 52a of the baffle plate 52.
[ third embodiment ]
Fig. 13 is a vertical sectional view showing an inlet portion of a demister unit of a third embodiment. Note that the same reference numerals are given to members having the same functions as those of the above-described embodiment, and detailed description thereof is omitted.
In the third embodiment, as shown in fig. 13, the demister unit 140 includes: a housing 51, a baffle 52, a perforated plate 53, a demister support plate 54, a demister body 55, and a receiving part 141. The housing 51, the baffle 52, the perforated plate 53, the demister support plate 54, and the demister body 55 have the same configuration as in the first embodiment, and therefore, the description thereof is omitted.
The receiving flow path 141 receives liquid droplets generated by collision of the exhaust gas introduced into the housing 51 from the inlet portion 61 with the baffle 52. The receiving member 141 is provided on the flat surface portion 52a of the baffle plate 52 facing the inlet portion 61 and below the inlet portion 61 in the vertical direction.
Each receiving member 141 is composed of a plurality of receiving member bodies 142, 143, and the plurality of receiving member bodies 142, 143 are inclined in a V shape. A water collecting portion 144 is provided at a lower connecting portion of each receiving member body 142, 143. That is, the receiving member bodies 142 and 143 are provided with receiving flow paths, not shown, which are opened at the position of the water collecting portion 144. A pipe portion 145 is provided below the water collecting portion 144 of the receiving member 141, and the pipe portion 145 is a drainage passage for allowing the received liquid droplets to flow to the reservoir portion 64 of the housing 51.
Therefore, the exhaust gas introduced into the housing 51 from the inlet 61 collides with the baffle plate 52 to generate droplets, and the droplets flow downward along the flat surface portion 52a of the baffle plate 52. At this time, the receiving member bodies 142 and 143 of the receiving member 141 can receive the droplets. The droplets received by the receiving member main bodies 142, 143 of the receiving member 141 can flow obliquely downward, collect in the water collecting portions 144, and flow from the water collecting portions 144 to the storage portion 64 through the pipe portions 145.
In this manner, the demister unit according to the third embodiment is provided with the receiving member 141 and the pipe portion 145, the receiving member 141 receives the liquid droplets generated by the collision of the flue gas with the baffle 52, and the pipe portion 145 serves as a drain flow path to flow the liquid droplets received by the receiving flow path 141 from the water collecting portion 135 to the storage portion 64 in the lower portion of the casing 51.
Therefore, the droplets adhering to the baffle plate 52 flow down through the flat surface portion 52a of the baffle plate 52 by their own weight and are received by the receiving member 141, and the droplets received by the receiving member 141 flow from the water collecting portion 144 to the reservoir portion 64 through the pipe portion 145, so that the droplets can be appropriately drained and prevented from contacting the exhaust gas flowing through the upstream flow path 63. Further, by providing the drain flow path as the piping portion 145 that communicates the droplets received by the receiving member 141 from the water collecting portion 144 to the reservoir portion 64, the generated droplets can be caused to flow to the reservoir portion 64 by the piping portion 145, and the generated droplets are prevented from contacting the exhaust gas flowing through the upstream side flow path 63.
[ fourth embodiment ]
Fig. 14 is a longitudinal sectional view showing a demister unit according to the fourth embodiment, and fig. 15 is a longitudinal sectional view showing an inlet portion of the demister unit. Note that the same reference numerals are given to members having the same functions as those of the above-described embodiment, and detailed description thereof is omitted.
In the fourth embodiment, as shown in fig. 14 and 15, the demister unit 150 includes: a housing 51, a baffle 52, a perforated plate 53, a demister support plate 54, a demister body 55, and a receiving member 151. The housing 51, the baffle 52, the perforated plate 53, the demister support plate 54, and the demister body 55 have the same configuration as in the first embodiment, and therefore, the description thereof is omitted.
The receiving flow path 151 receives droplets generated by the collision of the exhaust gas introduced into the housing 51 from the inlet portion 61 with the baffle 52. The receiving member 151 is provided at a lower portion of the baffle plate 52 in the vertical direction.
Each receiving member 151 is constituted by a bottom portion 152 and both side portions 153 and 154 provided along the flow direction of the droplets. The bottom portion 152 is horizontally disposed below the baffle plate 52 so as to be orthogonal to the flat surface portion 52a, and the side portions 153 and 154 are closely fixed so as to be vertically perpendicular to the respective side portions of the bottom portion 152 at the lower end portions thereof. Therefore, the receiving member 151 has a receiving flow path 155 formed by the bottom portion 152 and the side portions 153 and 154, which has an コ -shaped cross section and extends in the left-right direction of the baffle plate 52. The bottom portion 152 of the receiving member 151 is coupled to the lower end portion of the shutter 52 via the bracket 156, and the receiving member 151 is disposed below the shutter 52. The receiving member 151 is provided with drain passages 157 and 158 at its end portion, and the drain passages 157 and 158 allow the received droplets to flow to the reservoir 64 of the housing 51.
Therefore, the exhaust gas introduced from the inlet portion 61 into the housing 51 collides with the baffle plate 52 to generate droplets, and the droplets flow downward along the flat surface portion 52a of the baffle plate 52. At this time, the receiving flow path 155 of the receiving member 151 can receive the liquid droplets flowing down from the lower end portion of the baffle 52. The droplets received by the receiving flow path 155 of the receiving member 151 can flow from the drain flow paths 157 and 158 to the reservoir 64.
In this manner, in the demister unit according to the fourth embodiment, the receiving member 151 is provided at the lower portion of the baffle 52 in the vertical direction, and the receiving member 151 receives the liquid droplets generated by the collision of the exhaust gas with the baffle 52.
Therefore, since the droplets generated by the collision of the exhaust gas with the baffle 52 flow down through the flat surface portion 52a of the baffle 52 by their own weight and are received by the receiving member 151, the exhaust gas flowing through the upstream side flow path 63 does not take in the droplets again as mist, and the mist removed from the exhaust gas is suppressed from being taken in again into the exhaust gas, with the result that the mist removal efficiency can be improved. Further, by providing the receiving member 151 at the lower portion of the baffle plate 52, the liquid droplets can be efficiently received.
In the fourth embodiment, the receiving member 151 is disposed below the shutter 52, but the receiving member may be disposed below the shutter 52 on the side of the flat surface portion 52 a.
In the above-described embodiments, the receiving member is tilted in the first to third embodiments, and the receiving member is leveled in the fourth embodiment, but the receiving member of the present invention may be either horizontally or tilted, or may be partially tilted.
In the above-described embodiments, the shape of the housing 51 and the positions of the inlet 61 and the outlet 62 are not limited to the respective embodiments, and any position may be used as long as the inlet 61 faces the baffle 52. The baffle plate 52 is disposed along the vertical direction, but may be inclined.
In the above-described embodiment, the main internal combustion engine is used as the marine diesel engine, but the present invention can also be applied to a diesel engine used as a generator.
Description of the symbols
10 diesel engine for ship
11 Engine body
12 pressure booster
13 EGR system
14. 120, 140, 150 demister unit
41A EGR inlet valve
41B EGR Outlet valve
42 washing device
47 EGR blower
48 air cooler (cooler)
51 casing
52 baffle
53 perforated plate
54 demister supporting plate
55 demister body
56. 81, 84, 87, 90, 101, 111, 121, 122, 131, 132, 141, 151 receive a component
61 inlet part
62 outlet part
63 upstream side flow passage
64 storage part
65 downstream side flow passage
66. 67, 112, 113, 114, 123, 124, 125, 126, 142, 143 receive the component body
68. 82, 85, 152 bottom
69. 153, 154 side part
70. 83, 86, 89, 92, 127, 128, 155 receive flow paths
71. 72, 102, 115 drainage flow path
88 curved bottom
91 concave part
144 water collecting part
145 piping part (drainage flow path)
G4 waste gas recirculation path
G5 gas exhaust path
G6 inhalation Path
G7 waste gas providing path
W1 drainage circulation path
Claims (11)
1. A demister unit, comprising:
a housing having a hollow shape, an inlet portion and an outlet portion for fluid;
a baffle plate that is disposed in the casing so as to face the inlet portion, that is suspended from a ceiling portion of the casing, and that forms a curved flow path along a plumb direction of the casing;
a demister support plate having one end portion fixed in close contact with the rear wall portion of the casing and left and right side portions fixed in close contact with the left and right side wall portions of the casing in the casing, the demister support plate being arranged in a horizontal direction with respect to the bottom portion of the casing on the outlet portion side with respect to the baffle plate, the other end portion of the demister support plate being spaced apart from the baffle plate by a predetermined distance,
a demister body that is disposed between the ceiling portion and the demister support plate at a position on a downstream side in a fluid flow direction of the curved flow path in the casing, has a lower end of the baffle located below the demister body in a plumb direction, and is opposed to the baffle to remove mist from the fluid;
a perforated plate disposed below the demister support plate with a predetermined distance from the bottom of the housing, the perforated plate forming the curved flow channel so as to guide the flow direction of the fluid descending through the baffle plate toward the demister body; and
a receiving part that receives droplets generated by collision of the fluid with the baffle,
the receiving member is inclined in at least one of the left and right directions of the baffle plate, and prevents the mist removed from the fluid from being taken into the fluid again.
2. A demister unit as in claim 1,
the receiving member is a receiving flow path along a left-right direction of the baffle.
3. A demister unit as in claim 2,
the receiving flow path has a bottom portion and a side portion disposed along a flow direction of the liquid droplets.
4. A demister unit as in claim 2,
the receiving flow path is provided to be inclined downward toward an inner wall surface of the housing.
5. Demister unit according to any one of claims 1-4,
the receiving part is disposed at a planar portion of the baffle opposite the inlet portion.
6. Demister unit according to any one of claims 1-4,
the receiving member is provided at a lower portion of the baffle plate in the vertical direction.
7. Demister unit according to any one of claims 2-4,
the receiving members are provided in plurality in parallel in the vertical direction.
8. Demister unit according to any one of claims 2-4,
the demister unit is provided with a drain flow path that flows the liquid droplets received by the receiving member to a reservoir portion in a lower portion of the casing.
9. A demister unit as in claim 8,
the drainage flow path is provided between an end of the receiving member and an inner wall surface of the housing.
10. A demister unit as in claim 8,
the drain flow path is a piping portion communicating from the water collecting portion of the receiving member to the storage portion.
11. An EGR system, comprising:
an exhaust gas recirculation path that recirculates a part of exhaust gas discharged from an engine to the engine as a part of combustion gas;
a scrubber that removes harmful substances by spraying water to the exhaust gas flowing in the exhaust gas recirculation path; and
a demister unit as claimed in any one of claims 1 to 10 into which the exhaust gas from the scrubber is directed.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-073759 | 2015-03-31 | ||
| JP2015073759A JP6150835B2 (en) | 2015-03-31 | 2015-03-31 | Demister unit and EGR system |
| PCT/JP2016/055688 WO2016158116A1 (en) | 2015-03-31 | 2016-02-25 | Demister unit and egr system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107530609A CN107530609A (en) | 2018-01-02 |
| CN107530609B true CN107530609B (en) | 2022-09-06 |
Family
ID=57006717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680019611.8A Active CN107530609B (en) | 2015-03-31 | 2016-02-25 | Demister unit and EGR system |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6150835B2 (en) |
| KR (1) | KR101991604B1 (en) |
| CN (1) | CN107530609B (en) |
| WO (1) | WO2016158116A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6953198B2 (en) * | 2017-06-26 | 2021-10-27 | 小島プレス工業株式会社 | Gas-liquid separator for fuel cells |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013170539A (en) * | 2012-02-22 | 2013-09-02 | Mitsubishi Heavy Ind Ltd | Exhaust gas recirculation system |
| CN104125854A (en) * | 2011-12-23 | 2014-10-29 | 法雷奥热系统公司 | Water separator having filter assembly |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4634634Y1 (en) * | 1968-06-01 | 1971-11-30 | ||
| JPS4927071U (en) * | 1972-06-07 | 1974-03-08 | ||
| JPS5516856U (en) * | 1978-07-21 | 1980-02-02 | ||
| JPS5653862Y2 (en) * | 1980-03-13 | 1981-12-15 | ||
| JPS58156517U (en) * | 1982-04-09 | 1983-10-19 | 三菱樹脂株式会社 | eliminator |
| JPS6095B2 (en) * | 1982-07-26 | 1985-01-05 | 高丘工業株式会社 | Method and separator for separating and removing droplets in airflow |
| JPH0721206Y2 (en) * | 1989-10-06 | 1995-05-17 | ナイルス部品株式会社 | Gas-liquid separation device |
| JP2646785B2 (en) * | 1990-02-16 | 1997-08-27 | 松下電器産業株式会社 | Gas-liquid separation device |
| JPH07178315A (en) * | 1993-12-24 | 1995-07-18 | Babcock Hitachi Kk | Method and device for desulfurizing flue gas |
| JPH08131764A (en) | 1994-11-04 | 1996-05-28 | Babcock Hitachi Kk | Wet type exhaust gas treatment method and apparatus |
| JPH08254160A (en) * | 1995-03-16 | 1996-10-01 | Kawasaki Heavy Ind Ltd | Exhaust gas recirculation control device for diesel engine |
| JP2002332919A (en) * | 2001-02-26 | 2002-11-22 | Mitsubishi Heavy Ind Ltd | Exhaust gas recirculation system |
| JP4083072B2 (en) * | 2003-05-22 | 2008-04-30 | 株式会社タクマ | Steam separator |
| CN102341589B (en) * | 2009-03-18 | 2013-08-28 | 曼恩柴油机涡轮公司,曼恩柴油机涡轮德国公司子公司 | Large Turbocharged Two-Stroke Diesel Engine With Exhaust- Or Combustion Gas Recirculation And Method For Reducing NOx And Soot Emissions |
| US9039799B2 (en) * | 2009-09-04 | 2015-05-26 | Advanced Technologies & Innovations B. V. | Drained coalescer |
| JP2013044456A (en) * | 2011-08-23 | 2013-03-04 | Hitachi Appliances Inc | Oil separator and refrigerating cycle apparatus |
| CN103041678B (en) * | 2012-12-21 | 2015-02-11 | 浙江天蓝环保技术股份有限公司 | Ammonia flue gas desulfuration and denitration combined process and device |
| JP2014139523A (en) * | 2013-01-21 | 2014-07-31 | Toshiba Corp | Steam drier |
-
2015
- 2015-03-31 JP JP2015073759A patent/JP6150835B2/en active Active
-
2016
- 2016-02-25 CN CN201680019611.8A patent/CN107530609B/en active Active
- 2016-02-25 WO PCT/JP2016/055688 patent/WO2016158116A1/en active Application Filing
- 2016-02-25 KR KR1020177027245A patent/KR101991604B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104125854A (en) * | 2011-12-23 | 2014-10-29 | 法雷奥热系统公司 | Water separator having filter assembly |
| JP2013170539A (en) * | 2012-02-22 | 2013-09-02 | Mitsubishi Heavy Ind Ltd | Exhaust gas recirculation system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6150835B2 (en) | 2017-06-21 |
| KR101991604B1 (en) | 2019-06-20 |
| JP2016193393A (en) | 2016-11-17 |
| WO2016158116A1 (en) | 2016-10-06 |
| CN107530609A (en) | 2018-01-02 |
| KR20170120684A (en) | 2017-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107427754B (en) | Demister unit and EGR system | |
| KR101675445B1 (en) | Wet scrubber device, engine system, and ship | |
| JP6412976B2 (en) | Demister unit and EGR system | |
| JP2016514038A (en) | Scrubber for exhaust gas from ships | |
| CN108602002B (en) | Demisting unit and EGR system | |
| CN107530609B (en) | Demister unit and EGR system | |
| CN108697957B (en) | Demister unit and EGR system | |
| JP6412977B2 (en) | Demister unit and EGR system | |
| JP5852029B2 (en) | Recirculation exhaust gas purification apparatus and method | |
| KR102393267B1 (en) | Demister unit | |
| KR102054865B1 (en) | An Exhaust Gas Treatment System Having Backflow Prevention Means | |
| KR20180127581A (en) | A Hybrid Type Exhaust Gas Treatment System Having Improved Space Efficiency | |
| KR101964959B1 (en) | A Hybrid Type Exhaust Gas Treatment System for Automatic Control on Supply Mode of Scrubbing Solution Based on the Location Information and a Method thereof | |
| RU33781U1 (en) | Device for cooling and humidifying charge air of an internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |