WO2016158571A1 - Demister unit and egr system - Google Patents

Demister unit and egr system Download PDF

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Publication number
WO2016158571A1
WO2016158571A1 PCT/JP2016/059017 JP2016059017W WO2016158571A1 WO 2016158571 A1 WO2016158571 A1 WO 2016158571A1 JP 2016059017 W JP2016059017 W JP 2016059017W WO 2016158571 A1 WO2016158571 A1 WO 2016158571A1
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WO
WIPO (PCT)
Prior art keywords
drain
demister
casing
exhaust gas
water storage
Prior art date
Application number
PCT/JP2016/059017
Other languages
French (fr)
Japanese (ja)
Inventor
中川　貴裕
平岡　直大
和久 伊藤
Original Assignee
三菱重工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to CN201680019091.0A priority Critical patent/CN107427754B/en
Priority to KR1020177027251A priority patent/KR102084835B1/en
Publication of WO2016158571A1 publication Critical patent/WO2016158571A1/en

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/10—Venturi scrubbers
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids

Definitions

  • the present invention relates to a demister unit that removes mist from exhaust gas, and an EGR system to which this demister unit is applied.
  • exhaust gas recirculation is one that reduces NOx in the exhaust gas.
  • the EGR is for returning a part of the exhaust gas discharged from the combustion chamber of the internal combustion engine to the combustion chamber as a combustion gas. Therefore, the combustion gas has a reduced oxygen concentration, and the combustion temperature is reduced by delaying the rate of combustion, which is the reaction between the fuel and oxygen, whereby the amount of NOx generation can be reduced.
  • the exhaust gas introduced from the inlet passes through the bending flow passage provided in the demister main body, whereby the contained mist collides with the wall surface of the bending flow passage and is separated.
  • the drain pipe is connected to the lower part of the demister main body, and the mist separated from the exhaust gas is stored in the lower tank through the drain pipe.
  • the present invention solves the above-mentioned problems, and an object of the present invention is to provide a demister unit and an EGR system for suppressing the backflow of water from the drain guiding portion to the demister main body to improve the mist removal efficiency.
  • the fluid introduced into the casing from the inlet passes through the demister main body to remove the contained mist, and this mist is guided downward from the drain guiding portion by its own weight.
  • the sealing portion is provided in the drain guiding portion, the fluid introduced into the casing from the inlet portion flows into the demister main body through the drain guiding portion even if the outlet portion side has a negative pressure. There is no. As a result, it is possible to suppress the backflow of water from the drain guiding portion to the main body of the demister to improve the mist removal efficiency.
  • the drain guiding portion is a drain pipe whose proximal end portion is connected to the lower portion of the demister main body, and the sealing portion prevents the inflow of fluid by storing water in the drain pipe. It is characterized by
  • the drain guiding portion is a drain pipe and the sealing portion seals by storing water in the drain pipe, it is possible to easily prevent the inflow of fluid into the demister main body through the drain pipe with a simple configuration. Can.
  • the sealing portion is a water storage portion provided in the drain pipe.
  • the drain pipe has a straight portion whose upper end is connected to the lower portion of the demister main body, and a bent portion as the water storage portion connected to the lower end of the straight portion and bent upward. It is characterized by having.
  • the bent portion as the water storage portion, it is possible to easily prevent the backflow of fluid to the demister main body with a simple configuration.
  • a drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the drain pipe is the drain discharge pipe. It is characterized by being connected to.
  • the mist separated from the exhaust gas flows directly to the drain discharge pipe, and the piping to the water storage tank can be reduced.
  • the drain pipe is characterized in that the sealing portion is disposed outside the casing.
  • the sealing portion of the drain pipe on the outside of the casing, when the sealing portion is blocked by the foreign matter, the foreign matter can be easily removed, and the maintainability can be improved.
  • a drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the drain pipe is provided in the casing. It is characterized by being opened.
  • the drain pipe can be miniaturized, and the manufacturing cost can be reduced.
  • the sealing portion is a water storage portion provided in the casing, and a tip end portion of the drain pipe is in communication with the water storage portion.
  • the drain pipe can be sealed without changing the shape of the drain pipe, thereby simplifying the structure and reducing the cost. it can.
  • a drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the upper end portion of the drain discharge pipe is the above
  • the water storage portion is provided by being opened upward from the bottom of the casing.
  • the water storage portion is configured by opening the upper end portion of the drain discharge pipe above the bottom portion of the casing, the water storage portion can be easily formed in the casing, and the configuration can be simplified.
  • a drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the partition plate is fixed to the bottom of the casing.
  • the above-mentioned water storage part is provided by being carried out.
  • the partition plate to the bottom of the casing and providing the water storage portion, the water storage portion can be easily formed in the casing, and the configuration can be simplified.
  • the partition plate is characterized in that a discharge hole is formed at the lower end portion.
  • the foreign matter accumulated in the water storage portion can be easily discharged from the discharge hole.
  • the demister unit according to the present invention is characterized in that a communication pipe is provided which communicates the outlet portion of the casing with the upper portion of the water storage tank.
  • the outlet of the casing becomes negative pressure due to the suction of the blower, and this negative pressure acts on the upper part of the water storage tank through the communication pipe, so the mist separated from the exhaust gas in the casing is drained and drained.
  • the pipe can be properly drained into the reservoir.
  • the exhaust gas recirculation line recycles a part of the exhaust gas discharged from the engine to the engine as a part of the combustion gas, and water for the exhaust gas flowing through the exhaust gas recirculation line And a demister unit to which exhaust gas discharged from the scrubber is introduced.
  • the scrubbers inject water to the exhaust gas flowing through the exhaust gas recirculation line, whereby harmful substances are removed, and the demister unit After the mist contained is removed by the catalyst, it is supplied to the engine.
  • the demister unit the fluid introduced into the casing from the inlet passes the demister main body to remove the contained mist, and this mist is guided downward from the drain guiding portion by its own weight.
  • the sealing portion is provided in the drain guiding portion, the fluid introduced into the casing from the inlet portion flows into the demister main body through the drain guiding portion even if the outlet portion side has a negative pressure. There is no. As a result, it is possible to suppress the backflow of water from the drain guiding portion to the main body of the demister to improve the mist removal efficiency.
  • the demister unit and the EGR system of the present invention it is possible to improve the mist removal efficiency by suppressing the backflow of water from the drain guiding portion to the demister main body.
  • FIG. 1 is a schematic view showing a diesel engine equipped with an EGR system to which the demister unit of the first embodiment is applied.
  • FIG. 2 is a schematic block diagram showing the EGR system of the first embodiment.
  • FIG. 3 is a longitudinal sectional view showing the demister unit of the first embodiment.
  • FIG. 4 is a horizontal sectional view showing the demister unit of the first embodiment.
  • FIG. 5 is a longitudinal cross-sectional view showing the entrance part of the demister unit of 2nd Embodiment.
  • FIG. 6 is a longitudinal cross-sectional view showing the inlet of the demister unit of the third embodiment.
  • FIG. 7 is a side view showing the connection portion between the drain pipe and the drain discharge pipe of the third embodiment.
  • FIG. 8 is a longitudinal sectional view showing a demister unit of a fourth embodiment.
  • FIG. 9 is a longitudinal sectional view showing a demister unit of a fifth embodiment.
  • FIG. 10 is a perspective view showing the partition plate of the fifth embodiment.
  • FIG. 1 is a schematic view showing a diesel engine provided with an EGR system to which the demister unit of the first embodiment is applied
  • FIG. 2 is a schematic configuration view showing an EGR system according to the first embodiment.
  • the marine diesel engine 10 includes an engine body 11, a supercharger 12, and an EGR system 13.
  • the engine body 11 is a propulsion engine (main engine) that drives and rotates a propulsion propeller via a propeller shaft.
  • the engine body 11 is a uniflow scavenging diesel engine, which is a two-stroke diesel engine, in which the flow of intake and exhaust in the cylinder is one direction from the lower side to the upper side, and the residual of the exhaust is eliminated. It is.
  • the engine body 11 includes a plurality of cylinders (combustion chambers) 21 in which pistons move up and down, a scavenging air trunk 22 in communication with the cylinders 21, and an exhaust manifold 23 in communication with the cylinders 21.
  • the scavenging ports 24 are provided between the cylinders 21 and the scavenging trunk 22, and the exhaust flow path 25 is provided between the cylinders 21 and the exhaust manifold 23.
  • the engine body 11 has the scavenging air trunk 22 connected to the air supply line G1 and the exhaust manifold 23 connected to the exhaust line G2.
  • the turbocharger 12 is configured by connecting a compressor 31 and a turbine 32 so as to rotate integrally with a rotating shaft 33.
  • the turbine 32 is rotated by the exhaust gas discharged from the exhaust line G2 of the engine body 11, the rotation of the turbine 32 is transmitted by the rotation shaft 33, and the compressor 31 is rotated. And / or compresses the recirculated gas and supplies it to the engine body 11 from the air supply line G1.
  • the compressor 31 is connected to a suction line G6 for drawing air from the outside (atmosphere).
  • the turbocharger 12 is connected to an exhaust line G3 for discharging the exhaust gas that has rotated the turbine 32, and the exhaust line G3 is connected to a chimney (funnel) not shown. Further, an EGR system 13 is provided between the exhaust line G3 and the air supply line G1.
  • the EGR system 13 includes exhaust gas recirculation lines G4, G5, G7, a scrubber 42, a demister unit 14, and an 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 compresses the mixture by the turbocharger 12 and recycles it to the marine diesel engine 10 as a combustion gas, thereby causing combustion. It suppresses the formation of NOx.
  • a part of the exhaust gas is extracted from the downstream side of the turbine 32, a part of the exhaust gas may be extracted from the upstream side of the turbine 32.
  • the exhaust gas is discharged from the engine main body 11 to the exhaust line G2 and then discharged to the outside from the exhaust line G3, and the recycle gas is separated from the exhaust line G3.
  • a part of the exhaust gas is returned to the engine main body 11 by the exhaust gas recirculation lines G4, G5 and G7.
  • the exhaust gas recirculation line G4 is connected to the middle of the exhaust line G3.
  • the exhaust gas recirculation line 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 / closes the exhaust gas branched from the exhaust line G3 to the exhaust gas recirculation line G4 by opening / closing the exhaust gas recirculation line G4.
  • the EGR inlet valve 41A may be used as a flow rate adjusting valve to adjust the flow rate of the exhaust gas passing through the exhaust gas recirculation line G4.
  • the scrubber 42 is a Venturi-type scrubber, and includes a hollow throat 43, a venturi 44 into which exhaust gas is introduced, and an enlarged portion 45 that gradually returns to the original flow velocity.
  • the scrubber 42 includes a water injection unit 46 that injects water to the exhaust gas introduced into the venturi unit 44.
  • the scrubber 42 is connected to an exhaust gas recirculation line G5 for discharging an exhaust gas from which harmful substances such as SOx and particulates (PM) such as dust and the like have been removed and waste water containing the harmful substances.
  • a Venturi type is employ
  • the exhaust gas recirculation line G5 is provided with a demister unit 14 and an EGR blower 47.
  • the demister unit 14 separates the waste gas and the waste gas from which harmful substances have been removed by water injection.
  • the demister unit 14 is provided with a drainage circulation line W1 that circulates the drainage to the water injection unit 46 of the scrubber 42.
  • the drainage circulation line W1 is provided with a hold tank 49 and a pump 50 for temporarily storing drainage.
  • the EGR blower 47 guides the exhaust gas in the scrubber 42 to the demister unit 14 from the exhaust gas recirculation line G5.
  • the exhaust gas recirculation line G7 has one end connected to the EGR blower 47 and the other end connected to the compressor 31 via a mixer (not shown), and the exhaust gas is sent to the compressor 31 by the EGR blower 47.
  • the exhaust gas recirculation line G7 is provided with an EGR outlet valve (on-off valve or flow control valve) 41B.
  • the air from the suction line G6 and the exhaust gas (recirculation gas) from the exhaust gas recirculation line G7 are mixed in a mixer to generate a combustion gas.
  • this mixer may be provided separately from the silencer, or the silencer may be configured to have a function of mixing exhaust gas and air without separately providing a mixer.
  • the supercharger 12 can supply the combustion gas compressed by the compressor 31 from the air supply line G1 to the engine body 11, and an air cooler (cooler) 48 is provided on the air supply line G1.
  • the air cooler 48 cools the combustion gas by exchanging heat between the combustion gas compressed by the compressor 31 and having a high temperature and the cooling water.
  • the demister unit 14 described above includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 53, a drain discharge pipe 54, and a water storage tank 55, as shown in FIGS. .
  • the casing 51 has a hollow rectangular shape and is configured as a container that forms an internal space. That is, the casing 51 is formed in a box shape by the upstream side wall 51a, the downstream side wall 51b, the left and right side walls 51c, the ceiling 51d, and the bottom 51e.
  • an inlet 61 is formed on the upper side of one end (the right end in FIGS. 3 and 4) into which exhaust gas (solid arrow) and drainage (dotted arrow) are introduced.
  • An outlet 62 for exhausting the exhaust gas is formed on the upper side (the left end in FIGS. 3 and 4).
  • the inlet part 61 is formed in the upstream side wall part 51a, and the outlet part 62 is formed in the downstream side wall part 51b.
  • the casing 51 is provided on the exhaust gas recirculation line G5.
  • the demister main body 52 is disposed in the casing 51 and separates the mist contained in the exhaust gas by passing the exhaust gas introduced from the inlet 61 and guides the exhaust gas after removing the mist to the outlet 62. It is a thing.
  • the demister main body 52 is internally provided with a channel (not shown) bent a plurality of times so that exhaust gas can pass therethrough, and is configured as a bellows-like plate body as a whole.
  • the casing 51 is an intermediate portion in the vertical direction, and the demister support plate 63 is disposed from the intermediate portion in the flow direction of the exhaust gas toward the downstream side.
  • the demister support plate 63 is a plate disposed along the horizontal direction, the side portion thereof is fixed to the left and right side wall portions 51c, and one end portion thereof is fixed to the downstream side wall portion 51b.
  • the demister main body 52 is disposed on the other end of the demister support plate 63, with the side portions in close contact with the left and right side wall portions 51c, and the upper end portions in close contact with the ceiling portion 51d.
  • the casing 51 is provided with an upstream side flow passage 64 between the inlet 61 and the demister main body 52, and a downstream passage 65 between the demister main body 52 and the outlet 62. Further, the casing 51 is provided with a lower side space 66 below the demister support plate 63 so that the upstream side flow path 64 communicates.
  • the demister main body 52 is provided at its lower portion with a drain pipe 53 for guiding the mist separated by the demister main body 52 downward.
  • the drain pipe 53 is a straight pipe disposed along the vertical direction, and the upper end portion thereof is connected to the demister main body 52 through the demister support plate 63, and the lower end portion is on the lower side of the casing 51.
  • the space 66 is open.
  • the casing 51 is provided at its lower portion with a drain discharge pipe 54 for discharging the drain (drainage) downward to the outside.
  • the drain discharge pipe 54 is a straight pipe disposed along the vertical direction, and penetrates the bottom 51 e of the casing 51.
  • the lower end portion of the drain discharge pipe 54 is connected to the upper portion of the water storage tank 55, and the drain discharged from the casing 51 can be stored in the water storage tank 55.
  • the water storage tank 55 constitutes a part of the water treatment apparatus, and the water treatment apparatus processes drain water stored in the water storage tank 55.
  • a water storage portion 67 is provided in the lower space portion 66.
  • the water storage portion 67 is formed by opening the upper end portion of the drain discharge pipe 54 above the bottom portion 51 e of the casing 51 at a position of a predetermined height H1. Therefore, in the casing 51, the mist separated from the exhaust gas becomes drain water and accumulates in the water storage portion 67, and the liquid level WF of the drain water is formed. When the liquid level WF of the drain water reaches the upper end of the drain discharge pipe 54, the drain water flows from the opening of the upper end of the drain discharge pipe 54 to the inside and is discharged to the water storage tank 55.
  • the downstream side passage 65 in the demister main body 52 is connected to the EGR blower 47 (see FIG. 2) via the exhaust gas recirculation line G5, the suction force of the EGR blower 47 causes a negative pressure. Then, there is a possibility that the exhaust gas introduced into the upstream side flow passage 64 from the inlet portion 61 may be sucked from the lower portion of the drain pipe 53 without flowing to the side of the demister main body 52 and backflow to the demister main body 52. Therefore, a sealing portion is provided to prevent the backflow (inflow) of the exhaust gas from the drain pipe 53 to the demister main body 52.
  • the downstream side passage 65 in the casing 51 and the upper portion (space portion) of the water storage tank 55 are communicated by the communication pipe 68.
  • the communication pipe 68 functions as a pressure equalizing pipe, whereby the interior of the demister unit 14 and the water storage tank 55 is equalized.
  • the communication pipe 68 may communicate the upstream passage 64 with the upper portion of the water storage tank 55. Even in this case, the interiors of the demister unit 14 and the water storage tank 55 can be equalized in pressure.
  • the engine body 11 when the combustion gas is supplied from the scavenging trunk 22 into the cylinder 21, the combustion gas is compressed by the piston, and fuel is stored for the high temperature combustion gas. Spontaneous ignition and combustion by injection. Then, the generated combustion gas is discharged from the exhaust manifold 23 to the exhaust line G2 as an exhaust gas.
  • the exhaust gas discharged from the engine body 11 is discharged to the exhaust line G3 after rotating the turbine 32 in the turbocharger 12, and when the EGR inlet valve 41A and the EGR outlet valve 41B are closed, the entire amount is the exhaust line It is discharged to the outside from G3.
  • the EGR inlet valve 41A and the EGR outlet valve 41B are open, a part of the exhaust gas flows from the exhaust line G3 to the exhaust gas recirculation line G4.
  • the exhaust gas (recirculation gas) that has flowed to the exhaust gas recirculation line G4 has harmful substances removed by the scrubber 42. That is, when the exhaust gas passes through the venturi section 44 at high speed, the scrubber 42 injects water from the water injection section 46, thereby cooling the exhaust gas with this water and dropping harmful substances together with the water to remove it. Then, the waste water containing the harmful substance flows into the demister unit 14 together with the EGR gas.
  • the exhaust gas from which harmful substances have been removed by the scrubber 42 is discharged to the exhaust gas recirculation line G5, and after the drainage is separated by the demister unit 14, the exhaust gas is sent to the turbocharger 12 by the exhaust gas recirculation line G7. Then, this exhaust gas is mixed with the air taken in from the suction line G6 to become a combustion gas, and after being compressed by the compressor 31 of the supercharger 12, it is cooled by the air cooler 48 and the engine main body 11 from the air supply line G1. Supplied to
  • the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is a plate-like member of the flow passage bent a plurality of times. By colliding with, the contained mist adheres to this plate-like body. Then, the mist attached to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 53 penetrating the demister support plate 63. Then, the mist that has flowed into the drain pipe 53 flows down to the lower side space portion 66 of the casing 51 through the inside.
  • the opening at the upper end portion of the drain discharge pipe 54 is at a predetermined height H1 from the bottom 51e of the casing 51, so the mist that has flowed from the drain pipe 53 into the lower space 66 of the casing 51 It is stored in the part 67. Further, the exhaust gas introduced into the casing 51 from the inlet portion 61 has a mist, and the drain water by the mist is also stored in the water storage portion 67. Then, when the liquid level WF of the drain water rises to the predetermined height H1, the water storage section 67 flows into the drain discharge pipe 54, and is drained to the water storage tank 55 through the drain discharge pipe 54.
  • the water storage section 67 is submerged in the drain water accumulated in the water storage section 67 and the sealing section is formed. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the lower portion of the drain pipe 53 and backflowing to the demister main body 52. Further, since the downstream side passage 65 and the water storage tank 55 are in communication with each other by the communication pipe 68, the pressure in the downstream side passage 65 and the water storage tank 55 is equalized. Backflow from the bottom to the demister main body 52 is prevented.
  • the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
  • the casing 51 is hollow and has the exhaust gas inlet 61 and the outlet 62, and the demister main body 52 removes mist from the exhaust gas in the casing 51.
  • a drain pipe (drain guiding portion) 53 which is connected to the lower part of the demister main body 52 and guides the mist separated by the demister main body 52 downward, and a water storage portion which prevents the inflow of exhaust gas from the drain pipe 53 to the demister main body 52 And the sealing portion 67).
  • the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52 to remove the contained mist, and the mist flows downward from the drain pipe 53 by its own weight.
  • the drain pipe 53 since the lower end portion of the drain pipe 53 intrudes in the drain water accumulated in the water storage portion 67, the drain water infiltrates here and a sealing portion is provided. Therefore, the drain can be appropriately drained by preventing the inflow of the exhaust gas present in the upstream side flow passage 64 to the demister main body 52 with a simple configuration.
  • the drain guiding portion is a drain pipe 53, and water is stored in the drain pipe 53 as a sealing portion to prevent the inflow of exhaust gas.
  • the water storage part 67 is provided in the casing 51 as a sealing part, and the drain water of the water storage part 67 is made to invade the lower end part of the drain pipe 53. As shown in FIG. Therefore, the exhaust gas can be easily prevented from flowing into the demister main body 52 through the drain pipe 53 with a simple configuration, and the configuration can be simplified and the cost can be reduced.
  • a drain discharge pipe 54 for discharging the drain in the casing 51 downward and a water storage tank 55 for storing the drain discharged from the drain discharge pipe 54 are provided.
  • the water storage portion 67 is provided by opening the portion above the bottom portion 51 e of the casing 51. Therefore, by forming the water storage portion 67 in the casing 51, the sealing portion can be easily formed, and the configuration can be simplified.
  • a communication pipe 68 for communicating the outlet portion 62 of the casing 51 with the upper portion of the water storage tank 55 is provided. Accordingly, the outlet portion 62 in the casing 51 is a negative pressure due to the action of the suction force of the EGR blower 47, and this negative pressure acts on the water storage tank 55 through the communication pipe 68, so the outlet portion 62 of the casing 51 and the water storage
  • the tank 55 is pressure-equalized, and the mist separated from the exhaust gas in the casing 51 can be properly drained from the drain drainage pipe 54 to the water storage tank 55.
  • the communication pipe 68 by providing the communication pipe 68, the inner diameter of the drain pipe 54 can be reduced, and the difference in head between the demister main body 52 and the water storage tank 55 can be reduced, and the apparatus can be made compact.
  • an exhaust gas recirculation line G4 that recirculates a part of the exhaust gas discharged from the engine body 11 to the engine body 11 as a part of the combustion gas
  • the scrubber 42 injects water to the exhaust gas flowing through the exhaust gas recirculation line G4, so that harmful substances are discharged.
  • the mist contained by the demister unit 14 After being removed and the mist contained by the demister unit 14 is removed, it is supplied to the engine main body 11.
  • the demister unit 14 when the exhaust gas passes through the demister main body 52, the contained mist is removed and flows downward from the drain pipe 53.
  • the drain pipe 53 since the lower end portion of the drain pipe 53 intrudes in the drain water accumulated in the water storage portion 67, the drain water infiltrates here and a sealing portion is provided.
  • the exhaust gas introduced into the casing 51 from the inlet portion 61 does not flow back to the demister main body 52 through the drain pipe 53.
  • FIG. 5 is a longitudinal cross-sectional view showing the entrance part of the demister unit of 2nd Embodiment.
  • the members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
  • the demister unit 70 includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 71, a drain discharge pipe 72, and a water storage tank 55. There is.
  • the casing 51 is formed with an inlet 61 and an outlet 62, and the demister main body 52 is disposed between the inlet 61 and the outlet 62.
  • the demister main body 52 is provided at its lower portion with a drain pipe 71 for guiding the mist separated by the demister main body 52 downward.
  • the drain pipe 71 includes a straight portion 81, a first bent portion 82, and a second bent portion 83.
  • the straight portion 81 is a straight pipe disposed along the vertical direction, and the upper end portion thereof is connected to the demister main body 52 through the demister support plate 63.
  • the first bent portion 82 is a curved tube having a U-shape in a front view bent upward, and one end portion thereof is connected to the lower end portion of the straight portion 81.
  • the second bent portion 83 is a curved tube having an inverted U-shape in a front view bent downward, one end portion is connected to the other end portion of the first bent portion 82, and the other end portion is a lower space It opens upward to the portion 66.
  • the drain pipe 71 is not limited to what is comprised from the linear part 81, the 1st bending part 82, and the 2nd bending part 83.
  • the linear portion 81 and the first bent portion 82 may be used, or even if a linear portion or a bent portion is added to the linear portion 81, the first bent portion 82, and the second bent portion 83.
  • the linear portion 81 may be eliminated and only the first bent portion 82 may be provided.
  • the casing 51 is provided with a drain discharge pipe 72 for discharging the drain to the outside.
  • the drain discharge pipe 72 is a straight pipe disposed along the vertical direction, and its upper end is connected to the bottom 51 e of the casing 51 and its lower end is connected to the upper of the water storage tank 55. The drain drained from the water can be stored in the water storage tank 55.
  • inclined plates 84 and 85 are fixed to a bottom 51e.
  • the inclined plates 8 and 85 are inclined downward toward the upper end portion of the drain discharge pipe 72 opened at the bottom portion 51 e of the casing 51.
  • the inclined plates 84 and 85 guide the drain water flowing into the casing 51 to the drain discharge pipe 72.
  • a sealing portion is provided to prevent the backflow (inflow) of the exhaust gas from the drain pipe 71 to the demister main body 52.
  • the sealing portion is a first bent portion 82 as a water storage portion provided in the drain pipe 71, and is opened to the lower side space portion 66 via the second bent portion 83.
  • the bending portion as the sealing portion is the first bending portion 82 in which the front view is U-shaped, and the first bending portion 82 and the second bending portion 83 in which the front view is S-shaped. is there.
  • the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is included by colliding with the plate body of the flow passage bent a plurality of times. Mist adheres to this plate. Then, the mist attached to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 71 penetrating the demister support plate 63. Then, the mist that has flowed into the drain pipe 71 flows into the lower side space portion 66 of the casing 51 through the inside.
  • the drain pipe 71 includes the straight portion 81, the first bent portion 82, and the second bent portion 83, the mist flowing into the drain pipe 71 extends from the straight portion 81 to the first bent portion 82, After temporarily accumulated in the first bending portion 82, the first bending portion 82 is pushed out to the second bending portion 83 and flows into the lower side space portion 66 of the casing 51.
  • the drain water which has fallen from the drain pipe 71 into the casing 51 flows into the drain discharge pipe 54 by the inclined plates 84 and 85 and is discharged to the water storage tank 55 through the drain discharge pipe 54.
  • a drain water is accumulated in the first bent portion 82 to form a sealed portion. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the lower portion of the drain pipe 71 and flowing back to the demister main body 52. Further, since the downstream side passage 65 and the water storage tank 55 communicate with each other by the communication pipe 68, the pressure in the downstream side passage 65 and the water storage tank 55 is equalized. Backflow from the bottom to the demister main body 52 is prevented.
  • the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
  • the drain pipe (drain guiding portion) 71 which is connected to the lower portion of the demister main body 52 and guides the mist separated by the demister main body 52 downward;
  • a first bent portion 82 as a water storage portion (sealing portion) for blocking the inflow of exhaust gas into the demister main body 52 is provided.
  • the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52 to remove the contained mist, and the mist flows downward from the drain pipe 71 by its own weight.
  • the drain pipe 71 is provided with a sealing portion by the drain water accumulating in the first bent portion 82. Therefore, the exhaust gas introduced into the casing 51 from the inlet portion 61 does not flow back to the demister main body 52 through the drain pipe 71. As a result, it is possible to suppress the backflow of drain water from the drain pipe 71 to the demister main body 52, and to improve the mist removal efficiency.
  • the first bent portion 82 in the drain pipe 71, a sealing portion in which the drain water is accumulated is provided, and the shape of the drain pipe 71 only needs to be changed, and the casing 51 is not changed.
  • the whole configuration can be simplified.
  • the drain pipe 71 has a straight portion 81 whose upper end is connected to the lower portion of the demister main body 52, and a first bent portion 82 connected to the lower end of the straight portion 81 and bent upward. And consists of. Therefore, the drain can be appropriately drained by preventing the inflow of the exhaust gas present in the upstream side flow passage 64 to the demister main body 52 with the simple configuration and the simple configuration.
  • the drain pipe 71 is opened in the casing 51. Therefore, the drain pipe 71 can be miniaturized, and the manufacturing cost can be reduced.
  • FIG. 6 is a longitudinal sectional view showing the inlet of the demister unit according to the third embodiment
  • FIG. 7 is a side view showing the connection between the drain pipe and the drain pipe.
  • the demister unit 90 includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 91, a drain discharge pipe 72, and a water storage tank 55. Is equipped.
  • the casing 51 is formed with an inlet 61 and an outlet 62, and the demister main body 52 is disposed between the inlet 61 and the outlet 62.
  • the demister main body 52 is provided at its lower portion with a drain pipe 91 for guiding the mist separated by the demister main body 52 downward.
  • the drain pipe 91 is configured of a straight portion 101, a first bent portion 102, a second bent portion 103, and a third bent portion 104.
  • the straight portion 101 is a straight pipe disposed along the vertical direction, and is disposed in the lower space portion 66 of the casing 51, and the upper end portion thereof penetrates the demister support plate 63 and is connected to the demister main body 52.
  • the lower end portion is openly connected to the bottom portion 51 e of the casing 51.
  • the first, second, and third bent portions 102, 103, and 104 are disposed outside the lower side of the casing 51.
  • the first bent portion 102 is a curved tube having a U-shape in a front view bent upward, and one end portion thereof is connected to the lower end portion of the straight portion 101.
  • the second bent portion 103 is a curved tube having a reverse U-shape in a front view bent downward, and one end portion thereof is connected to the other end portion of the first bent portion 102.
  • the third bent portion 104 is a curved tube that curves at 90 degrees, and one end thereof is connected to the lower end portion of the second bent portion 103 via the flange 105.
  • the casing 51 is provided at its lower portion with a drain discharge pipe 72 for discharging the drain downward to the outside, and its upper end is connected to the bottom 51 e of the casing 51 and its lower end is connected to the top of the water storage tank 55.
  • the drain pipe 91 the other end of the third bent portion 104 is connected to a middle portion in the vertical direction.
  • a sealing portion is provided to prevent the backflow (inflow) of the exhaust gas from the drain pipe 91 to the demister main body 52.
  • the sealing portion is a first bent portion 102 as a water storage portion provided in the drain pipe 91, and is in communication with the drain discharge pipe 72 via the second bent portion 103 and the third bent portion 104.
  • the bent portion as the sealing portion is the first bent portion 102 that is U-shaped in a front view.
  • the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is included by colliding with the plate body of the flow passage bent a plurality of times. Mist adheres to this plate. Then, the mist adhering to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 91 penetrating the demister support plate 63. Then, the mist that has flowed into the drain pipe 91 flows down to the lower side space portion 66 of the casing 51 through the inside.
  • the drain pipe 91 is composed of the straight portion 101, the first bent portion 102, the second bent portion 103, and the third bent portion 104, the mist which has flowed into the drain pipe 91 is the first from the straight portion 101. It reaches the bent portion 102, is temporarily accumulated in the second bent portion 102, is pushed out to the second bent portion 103, and flows into the drain pipe 72 through the third bent portion 104. The drain water flowing from the drain pipe 91 into the drain discharge pipe 72 is discharged to the water storage tank 55 through the drain discharge pipe 72.
  • a drain water is accumulated in the first bent portion 102 to form a sealed portion. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the lower portion of the drain pipe 91 and flowing back to the demister main body 52.
  • the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
  • a drain pipe (drain guiding portion) 91 which is connected to the lower part of the demister main body 52 and guides the mist separated by the demister main body 52 downward, and from the drain pipe 91 A first bent portion 102 as a water storage portion (sealing portion) for blocking the inflow of exhaust gas into the demister main body 52 is provided.
  • the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52 to remove the contained mist, and the mist flows downward from the drain pipe 91 by its own weight.
  • the drain pipe 91 is provided with a sealing portion by the drain water accumulating in the first bent portion 102. Therefore, the exhaust gas introduced into the casing 51 from the inlet 61 does not flow back to the demister main body 52 through the drain pipe 91. As a result, it is possible to suppress the backflow of drain water from the drain pipe 91 to the demister main body 52, and to improve the mist removal efficiency.
  • the lower end portion of the drain pipe 91 is connected to the middle portion of the drain discharge pipe 72. Therefore, the mist separated from the exhaust gas by the demister main body 52 is made to flow directly to the drain discharge pipe 72 by the drain pipe 91, and the increase of the drain water in the casing 51 can be suppressed.
  • the drain pipe 91 is a first bent portion forming a sealing portion by arranging the first, second, and third bent portions 102, 103, and 104 on the outside of the casing 51.
  • the position 102 is located outside the casing 51. Therefore, when the first, second, and third bent portions 102, 103, and 104 are closed by the foreign matter, the first, second, and third bent portions 102, 103, and 104 can be removed to remove the foreign matter. Maintenance can be improved.
  • FIG. 8 is a longitudinal sectional view showing a demister unit of a fourth embodiment.
  • the members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
  • the demister unit 110 includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 111, a drain discharge pipe 72, and a water storage tank 55. There is.
  • the casing 51 is formed with an inlet 61 and an outlet 62, and the demister main body 52 is disposed between the inlet 61 and the outlet 62.
  • the demister main body 52 is provided at its lower portion with a drain pipe 111 for guiding the mist separated by the demister main body 52 downward.
  • the drain pipe 111 is composed of a straight portion 121 and a bent portion 122.
  • the straight portion 121 is a straight pipe disposed along the vertical direction, and is disposed in the lower space portion 66 of the casing 51, and the upper end portion thereof penetrates the demister support plate 63 and is connected to the demister main body 52
  • the lower end portion is openly connected to the bottom portion 51 e of the casing 51.
  • the bent portion 122 is a curved tube having a U-shaped front view that is bent upward, and is disposed outside the lower portion of the casing 51.
  • One end portion of the bending portion 122 is connected to the lower end portion of the straight portion 121, and the other end portion is connected to the upstream side flow passage 64 so as to open to the bottom portion 51e.
  • the casing 51 is provided at its lower portion with a drain discharge pipe 72 for discharging the drain downward to the outside, and its upper end is connected to the bottom 51 e of the casing 51 and its lower end is connected to the top of the water storage tank 55.
  • a seal is provided to prevent backflow (inflow) of the exhaust gas from the drain pipe 111 to the demister main body 52.
  • the sealing portion is a bent portion 122 as a water storage portion provided in the drain pipe 111.
  • the bent portion as the sealing portion is a bent portion 122 which is U-shaped in a front view.
  • the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is included by colliding with the plate body of the flow passage bent a plurality of times. Mist adheres to this plate. Then, the mist attached to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 111 penetrating the demister support plate 63. Further, the exhaust gas introduced into the casing 51 from the inlet portion 61 has drain water, and this drain water flows into the drain pipe 111 from the upstream side flow path 64.
  • the drain pipe 111 Since the drain pipe 111 is provided with the bent portion 122, the mist flowing into the drain pipe 111 and the drain water flowing into the drain pipe 111 from the upstream side channel 64 temporarily accumulate in the bent portion 122. , The sealing portion is formed. Thereafter, when the bent portion 122 is filled with drain water, the mist that has flowed into the drain pipe 111 is pushed out to the upstream channel 64 through the inside. Then, the drain water flowing from the drain pipe 111 into the upstream channel 64 is discharged to the water storage tank 55 through the drain discharge pipe 72.
  • a drain water is accumulated in the bent portion 122 to form a sealed portion. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the drain pipe 111 and backflowing to the demister main body 52. Further, since the downstream side passage 65 and the water storage tank 55 communicate with each other through the communication pipe 68, the pressure in the downstream side passage 65 and the inside of the water storage tank 55 is equalized. Backflow from the bottom to the demister main body 52 is prevented.
  • the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
  • the drain pipe (drain guiding portion) 111 which is connected to the lower portion of the demister main body 52 and guides the mist separated by the demister main body 52 downward;
  • a bent portion 122 as a water storage portion (sealing portion) for blocking the inflow of exhaust gas into the demister main body 52 is provided.
  • the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52, whereby the contained mist is removed, and the mist flows from the drain pipe 111 to the upstream side flow passage 64 by its own weight.
  • the drain pipe 111 is provided with a sealed portion by the drain water being accumulated in the bent portion 122. Therefore, the exhaust gas introduced into the upstream side flow path 64 from the inlet portion 61 is prevented from flowing back to the demister main body 52 through the drain pipe 111. As a result, it is possible to suppress the backflow of drain water from the drain pipe 111 to the demister main body 52, and to improve the mist removal efficiency.
  • the drain pipe 111 is provided with a bent portion 122, and the lower end portion is in communication with the upstream side flow passage 64. Therefore, it is possible to supply the drainage (dotted line arrow) drained to the exhaust gas to the bent portion 122 and to seal the water early.
  • the bent portion 122 of the drain pipe 111 is disposed outside the casing 51. Therefore, when the bending portion 122 is blocked by a foreign object, the bending portion 122 can be removed to remove the foreign object, and the maintainability can be improved.
  • FIG. 9 is a longitudinal sectional view showing a demister unit of a fifth embodiment
  • FIG. 10 is a perspective view showing a partition plate.
  • the members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
  • the demister unit 130 includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 131, a drain discharge pipe 72, and a water storage tank 55. Is equipped.
  • the casing 51 is formed with an inlet 61 and an outlet 62, and the demister main body 52 is disposed between the inlet 61 and the outlet 62.
  • the demister main body 52 is provided at its lower portion with a drain pipe 131 for guiding the mist separated by the demister main body 52 downward.
  • the drain pipe 131 is a curved pipe bent at about 90 degrees, and is disposed in the lower side space 66 of the casing 51, and the upper end thereof penetrates the demister support plate 63 and is connected to the demister main body 52, The lower end portion is opened to the partition wall portion 123 and connected to the upstream side flow path 64.
  • the casing 51 is provided at its lower portion with a drain discharge pipe 72 for discharging the drain downward to the outside, and its upper end is connected to the bottom 51 e of the casing 51 and its lower end is connected to the top of the water storage tank 55.
  • a seal is provided to prevent the backflow (inflow) of the exhaust gas from the drain pipe 131 to the demister main body 52.
  • the partition plate 141 is fixed to the upper surface portion of the bottom portion 51 e in the upstream side flow passage 64.
  • the partition plate 141 is disposed parallel to the partition wall portion 123 at a predetermined interval, and a plurality of discharge holes 142 are formed at the lower end portion.
  • the plurality of discharge holes 142 can discharge foreign matter and drain water.
  • the above-mentioned sealing part is the water storage part 143 provided by the partition part 123 and the partition plate 141 in the upstream side flow path 64 of the casing 51, and the other end part of the drain pipe 131 penetrates the partition part 123 to communicate doing.
  • the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is included by colliding with the plate body of the flow passage bent a plurality of times. Mist adheres to this plate. Then, the mist attached to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 131 penetrating the demister support plate 63. Then, the mist that has flowed into the drain pipe 131 flows into the upstream side flow path 64 of the casing 51 through the inside.
  • the water storage section 143 is provided by the partition plate 141, and the lower end of the drain pipe 131 communicates with the water reservoir section 143. Therefore, the mist flowing into the drain pipe 131 is the upstream channel It flows to the 64 water reservoirs 143.
  • the drain water flowing from the drain pipe 131 to the water storage portion 143 flows into the drain discharge pipe 72 through the plurality of discharge holes 142 or overflows the partition plate 141, and flows into the water storage tank through the drain discharge pipe 72. It is discharged to 55.
  • the drain water is accumulated in the water storage portion 143 to form a sealed portion. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the drain pipe 131 and backflowing to the demister main body 52.
  • unburned fuel, oil, and the like are mixed as foreign matter in the drain water of the exhaust gas, and the foreign matter may be accumulated in the water storage portion 143 to reduce the storage amount of drain water.
  • the foreign matter mixed in the drain water is discharged from the water storage portion 143 by the plurality of water discharge holes 142, and the water storage amount of the water storage portion 143 is not reduced.
  • the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
  • a drain pipe (drain guiding portion) 131 is provided which is connected to the lower part of the demister main body 52 and guides the mist separated by the demister main body 52 downward.
  • the water storage portion (sealing portion) 143 is provided by fixing the partition plate 141 on the upper surface of the bottom portion 51 e of the second embodiment, and the lower end portion of the drain pipe 131 communicates with the water storage portion 143.
  • the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52 to remove the contained mist, and this mist flows from the drain pipe 131 to the water storage portion 143 by its own weight.
  • the drain pipe 131 is provided with a sealing portion by the lower end portion communicating with drain water accumulated in the water storage portion. Therefore, the exhaust gas introduced into the casing 51 from the inlet 61 does not flow back to the demister main body 52 through the drain pipe 131. As a result, it is possible to suppress the backflow of drain water from the drain pipe 131 to the demister main body 52, and to improve the mist removal efficiency.
  • a discharge hole 142 for discharging foreign matter and drain water from the water storage section 143 is formed in the partition plate 141. Therefore, foreign matter and drain water accumulated in the water storage portion 143 can be easily discharged from the discharge hole 142.
  • the upstream side flow passage 64 and the lower side space portion 66 are divided by the partition portion 123.
  • the casing 51 constituting the lower side space portion 66 by the partition portion 123 The lower part of the downstream side wall 51b and the downstream part of the bottom 51e may be eliminated. That is, the straight portion 121 of the drain pipe 111 and the drain pipe 131 may be disposed outside the casing 51.
  • drain pipe 53, 71, 91, 111, 131 and the drain drain pipe 54 were demonstrated as one pipe
  • the communication pipe 68 communicating the outlet portion 62 of the casing 51 with the upper portion of the water storage tank 55 is provided outside the casing 51, a part of the communication pipe 68 may be disposed in the casing 51.
  • main engine as a marine diesel engine, it is applicable also to the diesel engine used as a generator.
  • EGR Blower 48 Air Cooler (Cooler) 51 casing 52 demister main body 53, 71, 91, 111, 131 drain pipe (drain induction part) 54, 72 drain discharge pipe 55 water storage tank 61 inlet portion 62 outlet portion 63 demister support plate 67, 143 water storage portion (sealing portion) 68 communicating pipe 81, 121 straight part 82, 122 first bent part (sealing part, water storage part) 83 second bent portion 84, 85 inclined plate 123 partition portion 141 partition plate 142 discharge hole G4, G5, G7 exhaust gas recirculation line G6 intake line W1 drainage circulation line

Abstract

By providing a demister unit and EGR system with a casing (51), which has a hollow shape and is provided with an exhaust gas inlet portion (61) and outlet portion (62), a demister body (52), which removes mist from exhaust gas in the casing (51), a drain pipe (drain guide portion) (53), which is connected to the bottom of the demister body (52) and guides the mist separated by the demister body (52) downward, and a water storage portion (seal portion) (67), which prevents the exhaust gas from flowing from the drain pipe (53) into the demister body (52), the backflow of water from the drain guide portion to the demister body is suppressed and an improvement in mist removal efficiency is achieved.

Description

デミスタユニット及びＥＧＲシステムDemister unit and EGR system
　本発明は、排ガスからミストを除去するデミスタユニット、このデミスタユニットが適用されるＥＧＲシステムに関するものである。 The present invention relates to a demister unit that removes mist from exhaust gas, and an EGR system to which this demister unit is applied.
　湿式排ガス処理装置を介してボイラから排出される排ガスは、ミストを含んでいることから、この排ガスに含まれるミストを除去する必要がある。排ガスに含まれるミストを除去するものとして、デミスタやミストエリミネータがあり、例えば、下記特許文献１に記載されている。この特許文献１に記載された湿式排ガス処理装置は、ボイラからの排ガスを入口煙道により除塵塔に導入し、ここで排ガス中の煤塵を除去した後、排ガスが除塵塔デミスタを通過するときに排ガス中のミストを除去するものである。 Since the exhaust gas discharged from the boiler via the wet exhaust gas treatment apparatus contains mist, it is necessary to remove the mist contained in the exhaust gas. There are a demister and a mist eliminator as what removes the mist contained in waste gas, for example, it describes in the following patent documents 1. The wet exhaust gas treatment apparatus described in Patent Document 1 introduces exhaust gas from a boiler into a dust removal tower through an inlet flue, and after removing dust in the exhaust gas, when the exhaust gas passes through the dust removal tower demister It removes the mist in the exhaust gas.
　また、排ガス中のＮＯｘを低減するものとしては、排ガス再循環（ＥＧＲ）がある。このＥＧＲは、内燃機関の燃焼室から排出された排ガスの一部を、燃焼用気体として、燃焼室に戻すものである。そのため、燃焼用気体は、酸素濃度が低下し、燃料と酸素との反応である燃焼の速度を遅らせることで燃焼温度が低下し、ＮＯｘの発生量を減少させることができる。 Further, exhaust gas recirculation (EGR) is one that reduces NOx in the exhaust gas. The EGR is for returning a part of the exhaust gas discharged from the combustion chamber of the internal combustion engine to the combustion chamber as a combustion gas. Therefore, the combustion gas has a reduced oxygen concentration, and the combustion temperature is reduced by delaying the rate of combustion, which is the reaction between the fuel and oxygen, whereby the amount of NOx generation can be reduced.
特開平０８－１３１７６４号公報Japanese Patent Application Publication No. 08-131764
　従来のデミスタにて、入口から導入された排ガスは、デミスタ本体内に設けられた屈曲流路を通過することで、含有するミストが屈曲流路の壁面に衝突し、分離される。デミスタ本体は、下部にドレン管が連結されており、排ガスから分離されたミストがドレン管を通して下部のタンクに貯留される。ところで、デミスタは、出口に連結されるブロワにより内部が吸引されることで、入口から排ガスが導入される。そのため、デミスタは、デミスタ本体の出口側が負圧となる。すると、タンク内の水がドレン管の下部から吸入されてデミスタ本体に逆流してしまうおそれがある。 In the conventional demister, the exhaust gas introduced from the inlet passes through the bending flow passage provided in the demister main body, whereby the contained mist collides with the wall surface of the bending flow passage and is separated. The drain pipe is connected to the lower part of the demister main body, and the mist separated from the exhaust gas is stored in the lower tank through the drain pipe. By the way, in the demister, the exhaust gas is introduced from the inlet by the inside being sucked by the blower connected to the outlet. Therefore, in the demister, the outlet side of the demister main body has a negative pressure. Then, the water in the tank may be sucked from the lower portion of the drain pipe and flow back to the main body of the demister.
　本発明は上述した課題を解決するものであり、ドレン誘導部からデミスタ本体への水の逆流を抑制してミスト除去効率の向上を図るデミスタユニット及びＥＧＲシステムを提供することを目的とする。 The present invention solves the above-mentioned problems, and an object of the present invention is to provide a demister unit and an EGR system for suppressing the backflow of water from the drain guiding portion to the demister main body to improve the mist removal efficiency.
　上記の目的を達成するための本発明のデミスタユニットは、流体の入口部と出口部が設けられるケーシングと、前記ケーシング内で流体からミストを除去するデミスタ本体と、前記デミスタ本体の下部に連結されて前記デミスタ本体により分離された前記ミストを下方に導くドレン誘導部と、前記ドレン誘導部から前記デミスタ本体への流体の流入を阻止する封止部と、を備えることを特徴とするものである。 A demister unit according to the present invention for achieving the above object comprises: a casing provided with a fluid inlet and an outlet; a demister body for removing mist from fluid in the casing; and a lower portion of the demister body A drain guiding portion for guiding the mist separated by the demister main body downward, and a sealing portion for preventing the inflow of fluid from the drain guiding portion to the demister main body. .
　従って、入口部からケーシング内に導入された流体は、デミスタ本体を通過することで、含まれるミストが除去され、このミストは、自重によりドレン誘導部から下方に導かれる。このとき、ドレン誘導部に封止部が設けられていることから、出口部側が負圧になっても、入口部からケーシング内に導入された流体が、ドレン誘導部を通してデミスタ本体へ流入することはない。その結果、ドレン誘導部からデミスタ本体への水の逆流を抑制してミスト除去効率の向上を図ることができる。 Therefore, the fluid introduced into the casing from the inlet passes through the demister main body to remove the contained mist, and this mist is guided downward from the drain guiding portion by its own weight. At this time, since the sealing portion is provided in the drain guiding portion, the fluid introduced into the casing from the inlet portion flows into the demister main body through the drain guiding portion even if the outlet portion side has a negative pressure. There is no. As a result, it is possible to suppress the backflow of water from the drain guiding portion to the main body of the demister to improve the mist removal efficiency.
　本発明のデミスタユニットでは、前記ドレン誘導部は、基端部が前記デミスタ本体の下部に連結されるドレン管であり、前記封止部は、前記ドレン管内に貯水することで流体の流入を阻止することを特徴としている。 In the demister unit of the present invention, the drain guiding portion is a drain pipe whose proximal end portion is connected to the lower portion of the demister main body, and the sealing portion prevents the inflow of fluid by storing water in the drain pipe. It is characterized by
　従って、ドレン誘導部をドレン管とし、封止部によりこのドレン管内に貯水することで封止することから、簡単な構成でドレン管を通したデミスタ本体への流体の流入を容易に防止することができる。 Therefore, since the drain guiding portion is a drain pipe and the sealing portion seals by storing water in the drain pipe, it is possible to easily prevent the inflow of fluid into the demister main body through the drain pipe with a simple configuration. Can.
　本発明のデミスタユニットでは、前記封止部は、前記ドレン管に設けられる貯水部であることを特徴としている。 In the demister unit of the present invention, the sealing portion is a water storage portion provided in the drain pipe.
　従って、封止部としてドレン管に貯水部を設けるため、封止部の構成を簡素化することができる。 Therefore, since a water storage part is provided in a drain pipe as a sealing part, the structure of a sealing part can be simplified.
　本発明のデミスタユニットでは、前記ドレン管は、上端部が前記デミスタ本体の下部に連結される直線部と、前記直線部の下端部に連結されて上方に屈曲する前記貯水部としての屈曲部とを備えることを特徴としている。 In the demister unit of the present invention, the drain pipe has a straight portion whose upper end is connected to the lower portion of the demister main body, and a bent portion as the water storage portion connected to the lower end of the straight portion and bent upward. It is characterized by having.
　従って、貯水部として屈曲部を設けることで、簡単な構成で容易にデミスタ本体への流体の逆流を防止することができる。 Therefore, by providing the bent portion as the water storage portion, it is possible to easily prevent the backflow of fluid to the demister main body with a simple configuration.
　本発明のデミスタユニットでは、前記ケーシング内のドレンを下方に排出するドレン排出管と、前記ドレン排出管から排出されたドレンを貯留する貯水タンクとが設けられ、前記ドレン管は、前記ドレン排出管に連結されることを特徴としている。 In the demister unit of the present invention, a drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the drain pipe is the drain discharge pipe. It is characterized by being connected to.
　従って、ドレン管をドレン排出管に連結することで、排ガスから分離したミストを直接ドレン排出管に流すこととなり、貯水タンクへの配管を減らすことができる。 Therefore, by connecting the drain pipe to the drain discharge pipe, the mist separated from the exhaust gas flows directly to the drain discharge pipe, and the piping to the water storage tank can be reduced.
　本発明のデミスタユニットでは、前記ドレン管は、前記封止部が前記ケーシングの外側に配置されることを特徴としている。 In the demister unit of the present invention, the drain pipe is characterized in that the sealing portion is disposed outside the casing.
　従って、ドレン管の封止部がケーシングの外側に配置されることで、封止部が異物により閉塞したとき、容易にこの異物を除去することができ、メンテナンス性を向上することができる。 Therefore, by arranging the sealing portion of the drain pipe on the outside of the casing, when the sealing portion is blocked by the foreign matter, the foreign matter can be easily removed, and the maintainability can be improved.
　本発明のデミスタユニットでは、前記ケーシング内のドレンを下方に排出するドレン排出管と、前記ドレン排出管から排出されたドレンを貯留する貯水タンクとが設けられ、前記ドレン管は、前記ケーシング内に開口されることを特徴としている。 In the demister unit of the present invention, a drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the drain pipe is provided in the casing. It is characterized by being opened.
　従って、ドレン管をケーシング内に開口することで、ドレン管を小型化することができ、製造コストを低減することができる。 Therefore, by opening the drain pipe in the casing, the drain pipe can be miniaturized, and the manufacturing cost can be reduced.
　本発明のデミスタユニットでは、前記封止部は、前記ケーシングに設けられる貯水部であり、前記ドレン管の先端部が前記貯水部に連通されることを特徴としている。 In the demister unit of the present invention, the sealing portion is a water storage portion provided in the casing, and a tip end portion of the drain pipe is in communication with the water storage portion.
　従って、ドレン管の先端部がケーシングの貯水部に連通することで、ドレン管の形状を変更することなく、このドレン管を封止することができ、構成の簡素化及び低コスト化することができる。 Therefore, by connecting the tip of the drain pipe to the water storage portion of the casing, the drain pipe can be sealed without changing the shape of the drain pipe, thereby simplifying the structure and reducing the cost. it can.
　本発明のデミスタユニットでは、前記ケーシング内のドレンを下方に排出するドレン排出管と、前記ドレン排出管から排出されたドレンを貯留する貯水タンクとが設けられ、前記ドレン排出管の上端部が前記ケーシングの底部より上方に開口することで前記貯水部が設けられることを特徴としている。 In the demister unit of the present invention, a drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the upper end portion of the drain discharge pipe is the above The water storage portion is provided by being opened upward from the bottom of the casing.
　従って、ドレン排出管の上端部をケーシングの底部より上方に開口することで貯水部を構成しており、ケーシング内に容易に貯水部を形成することができ、構成を簡素化することができる。 Therefore, the water storage portion is configured by opening the upper end portion of the drain discharge pipe above the bottom portion of the casing, the water storage portion can be easily formed in the casing, and the configuration can be simplified.
　本発明のデミスタユニットでは、前記ケーシング内のドレンを下方に排出するドレン排出管と、前記ドレン排出管から排出されたドレンを貯留する貯水タンクとが設けられ、前記ケーシングの底部に仕切板が固定されることで前記貯水部が設けられることを特徴としている。 In the demister unit of the present invention, a drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the partition plate is fixed to the bottom of the casing. The above-mentioned water storage part is provided by being carried out.
　従って、ケーシングの底部に仕切板を固定して貯水部を設けることで、ケーシング内に容易に貯水部を形成することができ、構成を簡素化することができる。 Therefore, by fixing the partition plate to the bottom of the casing and providing the water storage portion, the water storage portion can be easily formed in the casing, and the configuration can be simplified.
　本発明のデミスタユニットでは、前記仕切板は、下端部に排出孔が形成されることを特徴としている。 In the demister unit of the present invention, the partition plate is characterized in that a discharge hole is formed at the lower end portion.
　従って、貯水部に溜まった異物を排出孔から容易に排出することができる。 Therefore, the foreign matter accumulated in the water storage portion can be easily discharged from the discharge hole.
　本発明のデミスタユニットでは、前記ケーシングにおける前記出口部と前記貯水タンクの上部とを連通する連通管が設けられることを特徴としている。 The demister unit according to the present invention is characterized in that a communication pipe is provided which communicates the outlet portion of the casing with the upper portion of the water storage tank.
　従って、ケーシングにおける出口部は、ブロワの吸引力が作用することから負圧になり、この負圧が連通管を通して貯水タンクの上部に作用するため、ケーシング内で排ガスから分離されたミストをドレン排水管から貯水タンクに適正に排出することができる。 Therefore, the outlet of the casing becomes negative pressure due to the suction of the blower, and this negative pressure acts on the upper part of the water storage tank through the communication pipe, so the mist separated from the exhaust gas in the casing is drained and drained. The pipe can be properly drained into the reservoir.
　また、本発明のＥＧＲシステムは、エンジンから排出された排ガスの一部を燃焼用気体の一部として前記エンジンに再循環する排ガス再循環ラインと、前記排ガス再循環ラインを流れる排ガスに対して水を噴射することで有害物質を除去するスクラバと、前記スクラバから排出された排ガスが導入される前記デミスタユニットと、を備えることを特徴とするものである。 In the EGR system according to the present invention, the exhaust gas recirculation line recycles a part of the exhaust gas discharged from the engine to the engine as a part of the combustion gas, and water for the exhaust gas flowing through the exhaust gas recirculation line And a demister unit to which exhaust gas discharged from the scrubber is introduced.
　従って、エンジンから排出された排ガスは、その一部が排ガス再循環ラインを通るとき、スクラバによりこの排ガス再循環ラインを流れる排ガスに対して水が噴射されることで有害物質が除去され、デミスタユニットにより含有するミストが除去された後、エンジンに供給される。このとき、デミスタユニットでは、入口部からケーシング内に導入された流体は、デミスタ本体を通過することで、含まれるミストが除去され、このミストは、自重によりドレン誘導部から下方に導かれる。このとき、ドレン誘導部に封止部が設けられていることから、出口部側が負圧になっても、入口部からケーシング内に導入された流体が、ドレン誘導部を通してデミスタ本体へ流入することはない。その結果、ドレン誘導部からデミスタ本体への水の逆流を抑制してミスト除去効率の向上を図ることができる。 Therefore, when a part of the exhaust gas discharged from the engine passes through the exhaust gas recirculation line, the scrubbers inject water to the exhaust gas flowing through the exhaust gas recirculation line, whereby harmful substances are removed, and the demister unit After the mist contained is removed by the catalyst, it is supplied to the engine. At this time, in the demister unit, the fluid introduced into the casing from the inlet passes the demister main body to remove the contained mist, and this mist is guided downward from the drain guiding portion by its own weight. At this time, since the sealing portion is provided in the drain guiding portion, the fluid introduced into the casing from the inlet portion flows into the demister main body through the drain guiding portion even if the outlet portion side has a negative pressure. There is no. As a result, it is possible to suppress the backflow of water from the drain guiding portion to the main body of the demister to improve the mist removal efficiency.
　本発明のデミスタユニット及びＥＧＲシステムによれば、ドレン誘導部からデミスタ本体への水の逆流を抑制してミスト除去効率の向上を図ることができる。 According to the demister unit and the EGR system of the present invention, it is possible to improve the mist removal efficiency by suppressing the backflow of water from the drain guiding portion to the demister main body.
図１は、第１実施形態のデミスタユニットが適用されたＥＧＲシステムを備えたディーゼルエンジンを表す概略図である。FIG. 1 is a schematic view showing a diesel engine equipped with an EGR system to which the demister unit of the first embodiment is applied. 図２は、第１実施形態のＥＧＲシステムを表す概略構成図である。FIG. 2 is a schematic block diagram showing the EGR system of the first embodiment. 図３は、第１実施形態のデミスタユニットを表す縦断面図である。FIG. 3 is a longitudinal sectional view showing the demister unit of the first embodiment. 図４は、第１実施形態のデミスタユニットを表す水平断面図である。FIG. 4 is a horizontal sectional view showing the demister unit of the first embodiment. 図５は、第２実施形態のデミスタユニットの入口部を表す縦断面図である。FIG. 5 is a longitudinal cross-sectional view showing the entrance part of the demister unit of 2nd Embodiment. 図６は、第３実施形態のデミスタユニットの入口部を表す縦断面図である。FIG. 6 is a longitudinal cross-sectional view showing the inlet of the demister unit of the third embodiment. 図７は、第３実施形態のドレン管とドレン排出管との連結部を表す側面図である。FIG. 7 is a side view showing the connection portion between the drain pipe and the drain discharge pipe of the third embodiment. 図８は、第４実施形態のデミスタユニットを表す縦断面図である。FIG. 8 is a longitudinal sectional view showing a demister unit of a fourth embodiment. 図９は、第５実施形態のデミスタユニットを表す縦断面図である。FIG. 9 is a longitudinal sectional view showing a demister unit of a fifth embodiment. 図１０は、第５実施形態の仕切板を表す斜視図である。FIG. 10 is a perspective view showing the partition plate of the fifth embodiment.
　以下に添付図面を参照して、本発明に係るデミスタユニット及びＥＧＲシステムの好適な実施形態を詳細に説明する。なお、この実施形態により本発明が限定されるものではなく、また、実施形態が複数ある場合には、各実施形態を組み合わせて構成するものも含むものである。 Hereinafter, preferred embodiments of a demister unit and an EGR system according to the present invention will be described in detail with reference to the attached drawings. Note that the present invention is not limited by the embodiments, and in the case where there are a plurality of embodiments, the present invention also includes those configured by combining the respective embodiments.
［第１実施形態］
　図１は、第１実施形態のデミスタユニットが適用されたＥＧＲシステムを備えたディーゼルエンジンを表す概略図、図２は、第１実施形態のＥＧＲシステムを表す概略構成図である。 First Embodiment
FIG. 1 is a schematic view showing a diesel engine provided with an EGR system to which the demister unit of the first embodiment is applied, and FIG. 2 is a schematic configuration view showing an EGR system according to the first embodiment.
　第１実施形態にて、図１に示すように、舶用ディーゼルエンジン１０は、エンジン本体１１と、過給機１２と、ＥＧＲシステム１３を備えている。 In the first embodiment, as shown in FIG. 1, the marine diesel engine 10 includes an engine body 11, a supercharger 12, and an EGR system 13.
　図２に示すように、エンジン本体１１は、図示しないが、プロペラ軸を介して推進用プロペラを駆動回転させる推進用の機関（主機関）である。このエンジン本体１１は、ユニフロー掃排気式のディーゼルエンジンであって、２ストロークディーゼルエンジンであり、シリンダ内の吸排気の流れを下方から上方への一方向とし、排気の残留を無くすようにしたものである。エンジン本体１１は、ピストンが上下移動する複数のシリンダ（燃焼室）２１と、各シリンダ２１に連通する掃気トランク２２と、各シリンダ２１に連通する排気マニホールド２３とを備えている。そして、各シリンダ２１と掃気トランク２２との間に掃気ポート２４が設けられ、各シリンダ２１と排気マニホールド２３との間に排気流路２５が設けられている。そして、エンジン本体１１は、掃気トランク２２に給気ラインＧ１が連結され、排気マニホールド２３に排気ラインＧ２が連結されている。 As shown in FIG. 2, although not shown, the engine body 11 is a propulsion engine (main engine) that drives and rotates a propulsion propeller via a propeller shaft. The engine body 11 is a uniflow scavenging diesel engine, which is a two-stroke diesel engine, in which the flow of intake and exhaust in the cylinder is one direction from the lower side to the upper side, and the residual of the exhaust is eliminated. It is. The engine body 11 includes a plurality of cylinders (combustion chambers) 21 in which pistons move up and down, a scavenging air trunk 22 in communication with the cylinders 21, and an exhaust manifold 23 in communication with the cylinders 21. The scavenging ports 24 are provided between the cylinders 21 and the scavenging trunk 22, and the exhaust flow path 25 is provided between the cylinders 21 and the exhaust manifold 23. The engine body 11 has the scavenging air trunk 22 connected to the air supply line G1 and the exhaust manifold 23 connected to the exhaust line G2.
　過給機１２は、コンプレッサ３１とタービン３２とが回転軸３３により一体に回転するように連結されて構成されている。この過給機１２は、エンジン本体１１の排気ラインＧ２から排出された排ガスによりタービン３２が回転し、タービン３２の回転が回転軸３３により伝達されてコンプレッサ３１が回転し、このコンプレッサ３１が空気及び／または再循環ガスを圧縮して給気ラインＧ１からエンジン本体１１に供給する。コンプレッサ３１は外部（大気）から空気を吸入する吸入ラインＧ６に接続されている。 The turbocharger 12 is configured by connecting a compressor 31 and a turbine 32 so as to rotate integrally with a rotating shaft 33. In the turbocharger 12, the turbine 32 is rotated by the exhaust gas discharged from the exhaust line G2 of the engine body 11, the rotation of the turbine 32 is transmitted by the rotation shaft 33, and the compressor 31 is rotated. And / or compresses the recirculated gas and supplies it to the engine body 11 from the air supply line G1. The compressor 31 is connected to a suction line G6 for drawing air from the outside (atmosphere).
　過給機１２は、タービン３２を回転した排ガスを排出する排気ラインＧ３が連結されており、この排気ラインＧ３は、図示しない煙突（ファンネル）に連結されている。また、排気ラインＧ３から給気ラインＧ１までの間にＥＧＲシステム１３が設けられている。 The turbocharger 12 is connected to an exhaust line G3 for discharging the exhaust gas that has rotated the turbine 32, and the exhaust line G3 is connected to a chimney (funnel) not shown. Further, an EGR system 13 is provided between the exhaust line G3 and the air supply line G1.
　ＥＧＲシステム１３は、排ガス再循環ラインＧ４、Ｇ５、Ｇ７と、スクラバ４２と、デミスタユニット１４と、ＥＧＲブロワ（送風機）４７とを備えている。このＥＧＲシステム１３は、舶用ディーゼルエンジン１０から排出された排ガスの一部を空気と混合した後、過給機１２により圧縮して燃焼用気体として舶用ディーゼルエンジン１０に再循環させることで、燃焼によるＮＯｘの生成を抑制するものである。なお、ここでは、タービン３２の下流側から排ガスの一部を抽気したが、タービン３２の上流側から排ガスの一部を抽気してもよい。 The EGR system 13 includes exhaust gas recirculation lines G4, G5, G7, a scrubber 42, a demister unit 14, and an 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 compresses the mixture by the turbocharger 12 and recycles it to the marine diesel engine 10 as a combustion gas, thereby causing combustion. It suppresses the formation of NOx. Here, although a part of the exhaust gas is extracted from the downstream side of the turbine 32, a part of the exhaust gas may be extracted from the upstream side of the turbine 32.
　なお、以下の説明にて、排ガスとは、エンジン本体１１から排気ラインＧ２に排出された後、排気ラインＧ３から外部に排出されるものであり、再循環ガスとは、排気ラインＧ３から分離された一部の排ガスが排ガス再循環ラインＧ４、Ｇ５、Ｇ７によりエンジン本体１１に戻されるものである。 In the following description, the exhaust gas is discharged from the engine main body 11 to the exhaust line G2 and then discharged to the outside from the exhaust line G3, and the recycle gas is separated from the exhaust line G3. A part of the exhaust gas is returned to the engine main body 11 by the exhaust gas recirculation lines G4, G5 and G7.
　排ガス再循環ラインＧ４は、一端が排気ラインＧ３の中途部に接続されている。排ガス再循環ラインＧ４は、ＥＧＲ入口バルブ（開閉弁）４１Ａが設けられており、他端がスクラバ４２に接続されている。ＥＧＲ入口バルブ４１Ａは、排ガス再循環ラインＧ４を開閉することで、排気ラインＧ３から排ガス再循環ラインＧ４に分流する排ガスをＯＮ／ＯＦＦする。なお、ＥＧＲ入口バルブ４１Ａを流量調整弁とし、排ガス再循環ラインＧ４を通過する排ガスの流量を調整するようにしてもよい。 One end of the exhaust gas recirculation line G4 is connected to the middle of the exhaust line G3. The exhaust gas recirculation line 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 / closes the exhaust gas branched from the exhaust line G3 to the exhaust gas recirculation line G4 by opening / closing the exhaust gas recirculation line G4. The EGR inlet valve 41A may be used as a flow rate adjusting valve to adjust the flow rate of the exhaust gas passing through the exhaust gas recirculation line G4.
　スクラバ４２は、ベンチュリ式のスクラバであり、中空形状をなすスロート部４３と、排ガスが導入されるベンチュリ部４４と、元の流速に段階的に戻す拡大部４５とを備えている。スクラバ４２は、ベンチュリ部４４に導入された排ガスに対して水を噴射する水噴射部４６を備えている。スクラバ４２は、ＳＯｘや煤塵などの微粒子（ＰＭ）といった有害物質が除去された排ガス及び有害物質を含む排水を排出する排ガス再循環ラインＧ５が連結されている。なお、本実施形態では、スクラバとしてベンチュリ式を採用しているが、この構成に限定されるものではない。 The scrubber 42 is a Venturi-type scrubber, and includes a hollow throat 43, a venturi 44 into which exhaust gas is introduced, and an enlarged portion 45 that gradually returns to the original flow velocity. The scrubber 42 includes a water injection unit 46 that injects water to the exhaust gas introduced into the venturi unit 44. The scrubber 42 is connected to an exhaust gas recirculation line G5 for discharging an exhaust gas from which harmful substances such as SOx and particulates (PM) such as dust and the like have been removed and waste water containing the harmful substances. In addition, in this embodiment, although a Venturi type is employ | adopted as a scrubber, it is not limited to this structure.
　排ガス再循環ラインＧ５は、デミスタユニット１４とＥＧＲブロワ４７が設けられている。 The exhaust gas recirculation line G5 is provided with a demister unit 14 and an EGR blower 47.
　デミスタユニット１４は、水噴射により有害物質が除去された排ガスと排水を分離するものである。デミスタユニット１４は、排水をスクラバ４２の水噴射部４６に循環する排水循環ラインＷ１が設けられている。そして、この排水循環ラインＷ１は、排水を一時的に貯留するホールドタンク４９とポンプ５０が設けられている。 The demister unit 14 separates the waste gas and the waste gas from which harmful substances have been removed by water injection. The demister unit 14 is provided with a drainage circulation line W1 that circulates the drainage to the water injection unit 46 of the scrubber 42. The drainage circulation line W1 is provided with a hold tank 49 and a pump 50 for temporarily storing drainage.
　ＥＧＲブロワ４７は、スクラバ４２内の排ガスを排ガス再循環ラインＧ５からデミスタユニット１４に導くものである。 The EGR blower 47 guides the exhaust gas in the scrubber 42 to the demister unit 14 from the exhaust gas recirculation line G5.
　排ガス再循環ラインＧ７は、一端がＥＧＲブロワ４７に接続されると共に、他端が混合器（図示略）を介してコンプレッサ３１に接続されており、ＥＧＲブロワ４７により排ガスがコンプレッサ３１に送られる。排ガス再循環ラインＧ７は、ＥＧＲ出口バルブ（開閉弁または流量調整弁）４１Ｂが設けられている。吸入ラインＧ６からの空気と、排ガス再循環ラインＧ７からの排ガス（再循環ガス）は、混合器で混合されることで燃焼用気体が生成される。なお、この混合器は、サイレンサと別に設けられてもよいし、混合器を別途設けることなく、排ガスと空気を混合する機能を付加するようにサイレンサを構成してもよい。そして、過給機１２は、コンプレッサ３１が圧縮した燃焼用気体を給気ラインＧ１からエンジン本体１１に供給可能であり、給気ラインＧ１にエアクーラ（冷却器）４８が設けられている。このエアクーラ４８は、コンプレッサ３１により圧縮されて高温となった燃焼用気体と冷却水とを熱交換することで、燃焼用気体を冷却するものである。 The exhaust gas recirculation line G7 has one end connected to the EGR blower 47 and the other end connected to the compressor 31 via a mixer (not shown), and the exhaust gas is sent to the compressor 31 by the EGR blower 47. The exhaust gas recirculation line G7 is provided with an EGR outlet valve (on-off valve or flow control valve) 41B. The air from the suction line G6 and the exhaust gas (recirculation gas) from the exhaust gas recirculation line G7 are mixed in a mixer to generate a combustion gas. Note that this mixer may be provided separately from the silencer, or the silencer may be configured to have a function of mixing exhaust gas and air without separately providing a mixer. The supercharger 12 can supply the combustion gas compressed by the compressor 31 from the air supply line G1 to the engine body 11, and an air cooler (cooler) 48 is provided on the air supply line G1. The air cooler 48 cools the combustion gas by exchanging heat between the combustion gas compressed by the compressor 31 and having a high temperature and the cooling water.
　上述したデミスタユニット１４は、図３及び図４に示すように、ケーシング５１と、デミスタ本体５２と、ドレン管（ドレン誘導部）５３と、ドレン排出管５４と、貯水タンク５５とを備えている。 The demister unit 14 described above includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 53, a drain discharge pipe 54, and a water storage tank 55, as shown in FIGS. .
　ケーシング５１は、中空の矩形状をなし、内部空間を形成する容器として構成されている。即ち、ケーシング５１は、上流側壁部５１ａ、下流側壁部５１ｂ、左右側壁部５１ｃ、天井部５１ｄ、底部５１ｅにより箱型に形成されている。ケーシング５１は、一端部（図３及び図４にて、右端部）の上側に排ガス（実線の矢印）および排水（点線の矢印）が導入される入口部６１が形成される一方、他端部（図３及び図４にて、左端部）の上側に排ガスが排出される出口部６２が形成されている。そして、入口部６１が上流側壁部５１ａに形成され、出口部６２が下流側壁部５１ｂに形成されている。このケーシング５１は、排ガス再循環ラインＧ５上に設けられている。 The casing 51 has a hollow rectangular shape and is configured as a container that forms an internal space. That is, the casing 51 is formed in a box shape by the upstream side wall 51a, the downstream side wall 51b, the left and right side walls 51c, the ceiling 51d, and the bottom 51e. In the casing 51, an inlet 61 is formed on the upper side of one end (the right end in FIGS. 3 and 4) into which exhaust gas (solid arrow) and drainage (dotted arrow) are introduced. An outlet 62 for exhausting the exhaust gas is formed on the upper side (the left end in FIGS. 3 and 4). And the inlet part 61 is formed in the upstream side wall part 51a, and the outlet part 62 is formed in the downstream side wall part 51b. The casing 51 is provided on the exhaust gas recirculation line G5.
　デミスタ本体５２は、ケーシング５１内に配置されており、入口部６１から導入された排ガスを通過させることで、排ガスが含有するミストを分離し、ミストを除去した後の排ガスを出口部６２へ導くものである。デミスタ本体５２は、内部に排ガスが通過できるような複数回屈曲した流路（図示せず）が設けられ、全体として蛇腹の板状体として構成されている。ケーシング５１は、鉛直方向における中間部であって、排ガスの流動方向の中間部から下流側に向けてデミスタ支持板６３が配置されている。このデミスタ支持板６３は、水平方向に沿って配置された板材であり、側部が左右側壁部５１ｃに固定され、一端部が下流側壁部５１ｂに固定されている。デミスタ本体５２は、デミスタ支持板６３における他端部上に設置されており、側部が左右側壁部５１ｃに密着し、上端部が天井部５１ｄに密着している。 The demister main body 52 is disposed in the casing 51 and separates the mist contained in the exhaust gas by passing the exhaust gas introduced from the inlet 61 and guides the exhaust gas after removing the mist to the outlet 62. It is a thing. The demister main body 52 is internally provided with a channel (not shown) bent a plurality of times so that exhaust gas can pass therethrough, and is configured as a bellows-like plate body as a whole. The casing 51 is an intermediate portion in the vertical direction, and the demister support plate 63 is disposed from the intermediate portion in the flow direction of the exhaust gas toward the downstream side. The demister support plate 63 is a plate disposed along the horizontal direction, the side portion thereof is fixed to the left and right side wall portions 51c, and one end portion thereof is fixed to the downstream side wall portion 51b. The demister main body 52 is disposed on the other end of the demister support plate 63, with the side portions in close contact with the left and right side wall portions 51c, and the upper end portions in close contact with the ceiling portion 51d.
　ケーシング５１は、入口部６１とデミスタ本体５２との間に上流側流路６４が設けられ、デミスタ本体５２と出口部６２との間に下流側通路６５が設けられている。また、ケーシング５１は、上流側流路６４の連通するようにデミスタ支持板６３の下方に下方側空間部６６が設けられている。デミスタ本体５２は、下部にデミスタ本体５２により分離されたミストを下方に導くドレン管５３が設けられている。ドレン管５３は、鉛直方向に沿って配設される直線状の管であり、上端部がデミスタ支持板６３を貫通して、デミスタ本体５２に連結されており、下端部がケーシング５１の下方側空間部６６に開口している。 The casing 51 is provided with an upstream side flow passage 64 between the inlet 61 and the demister main body 52, and a downstream passage 65 between the demister main body 52 and the outlet 62. Further, the casing 51 is provided with a lower side space 66 below the demister support plate 63 so that the upstream side flow path 64 communicates. The demister main body 52 is provided at its lower portion with a drain pipe 53 for guiding the mist separated by the demister main body 52 downward. The drain pipe 53 is a straight pipe disposed along the vertical direction, and the upper end portion thereof is connected to the demister main body 52 through the demister support plate 63, and the lower end portion is on the lower side of the casing 51. The space 66 is open.
　ケーシング５１は、下部にドレン（排水）を外部の下方に排出するドレン排出管５４が設けられている。ドレン排出管５４は、鉛直方向に沿って配設される直線状の管であり、ケーシング５１の底部５１ｅを貫通している。ドレン排出管５４は、下端部が貯水タンク５５の上部に連結されており、ケーシング５１から排出されたドレンを貯水タンク５５に貯留することができる。この貯水タンク５５は、水処理装置の一部を構成するものであり、この水処理装置は、貯水タンク５５に貯留されたドレン水を処理する。 The casing 51 is provided at its lower portion with a drain discharge pipe 54 for discharging the drain (drainage) downward to the outside. The drain discharge pipe 54 is a straight pipe disposed along the vertical direction, and penetrates the bottom 51 e of the casing 51. The lower end portion of the drain discharge pipe 54 is connected to the upper portion of the water storage tank 55, and the drain discharged from the casing 51 can be stored in the water storage tank 55. The water storage tank 55 constitutes a part of the water treatment apparatus, and the water treatment apparatus processes drain water stored in the water storage tank 55.
　ケーシング５１は、下方側空間部６６に貯水部６７が設けられている。この貯水部６７は、ドレン排出管５４の上端部がケーシング５１の底部５１ｅより上方に所定高さＨ１の位置に開口することで形成される。そのため、ケーシング５１は、排ガスから分離されたミストがドレン水となって貯水部６７に溜まり、ドレン水の液面ＷＦが形成される。このドレン水の液面ＷＦがドレン排出管５４の上端部まで到達すると、このドレン水がドレン排出管５４の上端部の開口から内部に流れ、貯水タンク５５に排出される。 In the casing 51, a water storage portion 67 is provided in the lower space portion 66. The water storage portion 67 is formed by opening the upper end portion of the drain discharge pipe 54 above the bottom portion 51 e of the casing 51 at a position of a predetermined height H1. Therefore, in the casing 51, the mist separated from the exhaust gas becomes drain water and accumulates in the water storage portion 67, and the liquid level WF of the drain water is formed. When the liquid level WF of the drain water reaches the upper end of the drain discharge pipe 54, the drain water flows from the opening of the upper end of the drain discharge pipe 54 to the inside and is discharged to the water storage tank 55.
　ところで、デミスタ本体５２における下流側通路６５は、排ガス再循環ラインＧ５を介してＥＧＲブロワ４７（図２参照）に接続されることから、このＥＧＲブロワ４７の吸引力により負圧となる。すると、入口部６１から、上流側流路６４に導入された排ガスが、デミスタ本体５２側に流れずにドレン管５３の下部から吸入されてデミスタ本体５２に逆流してしまうおそれがある。そのため、ドレン管５３からデミスタ本体５２への排ガスの逆流（流入）を阻止する封止部が設けられている。 By the way, since the downstream side passage 65 in the demister main body 52 is connected to the EGR blower 47 (see FIG. 2) via the exhaust gas recirculation line G5, the suction force of the EGR blower 47 causes a negative pressure. Then, there is a possibility that the exhaust gas introduced into the upstream side flow passage 64 from the inlet portion 61 may be sucked from the lower portion of the drain pipe 53 without flowing to the side of the demister main body 52 and backflow to the demister main body 52. Therefore, a sealing portion is provided to prevent the backflow (inflow) of the exhaust gas from the drain pipe 53 to the demister main body 52.
　この封止部は、ドレン管５３内に貯水することで排ガスの逆流を阻止するものであり、ケーシング５１に設けられる貯水部６７が機能する。即ち、前述したように、ドレン排出管５４は、上端部の開口がケーシング５１の底部５１ｅから所定高さＨ１の位置に設けられており、ドレン管５３は、下端部の開口がケーシング５１の底部５１ｅから所定高さＨ１より低い所定高さＨ２の位置に設けられている。そのため、ドレン管５３は、下部が貯水部６７に溜まったドレン水に連通し、最大で高さＨ（Ｈ＝Ｈ１－Ｈ２）だけ浸入することとなる。 The sealed portion is for storing water in the drain pipe 53 to prevent the backflow of the exhaust gas, and the water storage portion 67 provided in the casing 51 functions. That is, as described above, the drain discharge pipe 54 is provided with the opening at the upper end at a predetermined height H1 from the bottom 51e of the casing 51, and the drain pipe 53 has the opening at the lower end is the bottom of the casing 51 It is provided at a position of a predetermined height H2 lower than the predetermined height H1 from 51e. Therefore, the drain pipe 53 communicates with drain water whose lower portion is accumulated in the water storage portion 67, and enters the maximum height H (H = H1-H2).
　また、ケーシング５１における下流側通路６５と、貯水タンク５５の上部（空間部）とは、連通管６８により連通されている。前述したように、デミスタ本体５２における下流側通路６５が負圧になることから、この連通管６８を均圧管として機能させることで、デミスタユニット１４と貯水タンク５５の内部が均圧される。なお、連通管６８は、上流側通路６４と貯水タンク５５の上部とを連通していてもよい。この場合でもデミスタユニット１４と貯水タンク５５の内部を均圧とすることができる。 Further, the downstream side passage 65 in the casing 51 and the upper portion (space portion) of the water storage tank 55 are communicated by the communication pipe 68. As described above, since the downstream side passage 65 in the demister main body 52 has a negative pressure, the communication pipe 68 functions as a pressure equalizing pipe, whereby the interior of the demister unit 14 and the water storage tank 55 is equalized. The communication pipe 68 may communicate the upstream passage 64 with the upper portion of the water storage tank 55. Even in this case, the interiors of the demister unit 14 and the water storage tank 55 can be equalized in pressure.
　以下、第１実施形態のＥＧＲシステムの作用を説明する。 Hereinafter, the operation of the EGR system of the first embodiment will be described.
　図２に示すように、エンジン本体１１は、掃気トランク２２からシリンダ２１内に燃焼用気体が供給されると、ピストンによってこの燃焼用気体が圧縮され、この高温の燃焼用気体に対して燃料が噴射することで自然着火し、燃焼する。そして、発生した燃焼ガスは、排ガスとして排気マニホールド２３から排気ラインＧ２に排出される。エンジン本体１１から排出された排ガスは、過給機１２におけるタービン３２を回転した後、排気ラインＧ３に排出され、ＥＧＲ入口バルブ４１Ａ及びＥＧＲ出口バルブ４１Ｂが閉止しているときは、全量が排気ラインＧ３から外部に排出される。 As shown in FIG. 2, in the engine body 11, when the combustion gas is supplied from the scavenging trunk 22 into the cylinder 21, the combustion gas is compressed by the piston, and fuel is stored for the high temperature combustion gas. Spontaneous ignition and combustion by injection. Then, the generated combustion gas is discharged from the exhaust manifold 23 to the exhaust line G2 as an exhaust gas. The exhaust gas discharged from the engine body 11 is discharged to the exhaust line G3 after rotating the turbine 32 in the turbocharger 12, and when the EGR inlet valve 41A and the EGR outlet valve 41B are closed, the entire amount is the exhaust line It is discharged to the outside from G3.
　一方、ＥＧＲ入口バルブ４１Ａ及びＥＧＲ出口バルブ４１Ｂが開放しているとき、排ガスは、その一部が排気ラインＧ３から排ガス再循環ラインＧ４に流れる。排ガス再循環ラインＧ４に流れた排ガス（再循環ガス）は、スクラバ４２により、有害物質が除去される。即ち、スクラバ４２は、排ガスがベンチュリ部４４を高速で通過するとき、水噴射部４６から水を噴射することで、この水により排ガスを冷却すると共に、有害物質を水と共に落下させて除去する。そして、有害物質を含む排水は、ＥＧＲガスと共にデミスタユニット１４に流入する。 On the other hand, when the EGR inlet valve 41A and the EGR outlet valve 41B are open, a part of the exhaust gas flows from the exhaust line G3 to the exhaust gas recirculation line G4. The exhaust gas (recirculation gas) that has flowed to the exhaust gas recirculation line G4 has harmful substances removed by the scrubber 42. That is, when the exhaust gas passes through the venturi section 44 at high speed, the scrubber 42 injects water from the water injection section 46, thereby cooling the exhaust gas with this water and dropping harmful substances together with the water to remove it. Then, the waste water containing the harmful substance flows into the demister unit 14 together with the EGR gas.
　スクラバ４２により有害物質が除去された排ガスは、排ガス再循環ラインＧ５に排出され、デミスタユニット１４により排水が分離された後、排ガス再循環ラインＧ７により過給機１２に送られる。そして、この排ガスは、吸入ラインＧ６から吸入された空気と混合されて燃焼用気体となり、過給機１２のコンプレッサ３１で圧縮された後、エアクーラ４８で冷却され、給気ラインＧ１からエンジン本体１１に供給される。 The exhaust gas from which harmful substances have been removed by the scrubber 42 is discharged to the exhaust gas recirculation line G5, and after the drainage is separated by the demister unit 14, the exhaust gas is sent to the turbocharger 12 by the exhaust gas recirculation line G7. Then, this exhaust gas is mixed with the air taken in from the suction line G6 to become a combustion gas, and after being compressed by the compressor 31 of the supercharger 12, it is cooled by the air cooler 48 and the engine main body 11 from the air supply line G1. Supplied to
　ここで、デミスタユニット１４による処理について説明する。 Here, processing by the demister unit 14 will be described.
　図３及び図４に示すように、入口部６１からケーシング５１内の上流側流路６４に導入された排ガスは、正面にあるデミスタ本体５２に流入し、複数回屈曲した流路の板状体に衝突することで、含まれるミストがこの板状体に付着する。すると、デミスタ本体５２の板状体に付着したミストは、自重により下方へ流れ落ち、デミスタ支持板６３を貫通するドレン管５３の上部開口に流入する。そして、ドレン管５３内に流入したミストは、内部を通ってケーシング５１の下方側空間部６６に流れ落ちる。 As shown in FIGS. 3 and 4, the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is a plate-like member of the flow passage bent a plurality of times. By colliding with, the contained mist adheres to this plate-like body. Then, the mist attached to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 53 penetrating the demister support plate 63. Then, the mist that has flowed into the drain pipe 53 flows down to the lower side space portion 66 of the casing 51 through the inside.
　ケーシング５１は、ドレン排出管５４の上端部の開口がケーシング５１の底部５１ｅから所定高さＨ１の位置にあることから、ドレン管５３からケーシング５１の下方側空間部６６に流れ落ちたミストは、貯水部６７に貯留される。また、入口部６１からケーシング５１内に導入された排ガスは、ミストを帯同しており、このミストによるドレン水も貯水部６７に貯留される。そして、貯水部６７は、ドレン水の液面ＷＦが所定高さＨ１まで上昇すると、このドレン水がドレン排出管５４に流入し、このドレン排出管５４を通して貯水タンク５５に排出される。 In the casing 51, the opening at the upper end portion of the drain discharge pipe 54 is at a predetermined height H1 from the bottom 51e of the casing 51, so the mist that has flowed from the drain pipe 53 into the lower space 66 of the casing 51 It is stored in the part 67. Further, the exhaust gas introduced into the casing 51 from the inlet portion 61 has a mist, and the drain water by the mist is also stored in the water storage portion 67. Then, when the liquid level WF of the drain water rises to the predetermined height H1, the water storage section 67 flows into the drain discharge pipe 54, and is drained to the water storage tank 55 through the drain discharge pipe 54.
　また、貯水部６７は、ドレン水の液面ＷＦが所定高さＨ２まで上昇すると、ドレン管５３の下部が貯水部６７に溜まったドレン水に水没し、封止部が形成される。そのため、入口部６１から上流側流路６４に導入された排ガスがドレン管５３の下部から吸入されてデミスタ本体５２に逆流することが防止される。また、下流側通路６５と貯水タンク５５が連通管６８により連通されていることから、この下流側通路６５と貯水タンク５５の内部が均圧されるため、この点でも、排ガスがドレン管５３の下部からデミスタ本体５２に逆流することが防止される。 In addition, when the liquid level WF of the drain water rises to the predetermined height H2, the water storage section 67 is submerged in the drain water accumulated in the water storage section 67 and the sealing section is formed. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the lower portion of the drain pipe 53 and backflowing to the demister main body 52. Further, since the downstream side passage 65 and the water storage tank 55 are in communication with each other by the communication pipe 68, the pressure in the downstream side passage 65 and the water storage tank 55 is equalized. Backflow from the bottom to the demister main body 52 is prevented.
　一方、デミスタ本体５２によりミストが除去された排ガスは、下流側流路６５を通って出口部６２から排出される。 On the other hand, the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
　このように第１実施形態のデミスタユニットにあっては、中空形状をなして排ガスの入口部６１と出口部６２が設けられるケーシング５１と、ケーシング５１内で排ガスからミストを除去するデミスタ本体５２と、デミスタ本体５２の下部に連結されてデミスタ本体５２により分離されたミストを下方に導くドレン管（ドレン誘導部）５３と、ドレン管５３からデミスタ本体５２への排ガスの流入を阻止する貯水部（封止部）６７とを設けている。 As described above, in the demister unit of the first embodiment, the casing 51 is hollow and has the exhaust gas inlet 61 and the outlet 62, and the demister main body 52 removes mist from the exhaust gas in the casing 51. A drain pipe (drain guiding portion) 53 which is connected to the lower part of the demister main body 52 and guides the mist separated by the demister main body 52 downward, and a water storage portion which prevents the inflow of exhaust gas from the drain pipe 53 to the demister main body 52 And the sealing portion 67).
　従って、入口部６１からケーシング５１内に導入された排ガスは、デミスタ本体５２を通過することで、含まれるミストが除去され、このミストは、自重によりドレン管５３から下方に流れ落ちる。このとき、ドレン管５３は、下端部が貯水部６７に溜まったドレン水内に侵入していることから、ここにドレン水が浸入して封止部が設けられている。そのため、簡単な構成で容易にデミスタ本体５２への上流側流路６４に存在する排ガスの流入を防ぐことで適切にドレンを排出することができる。 Accordingly, the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52 to remove the contained mist, and the mist flows downward from the drain pipe 53 by its own weight. At this time, since the lower end portion of the drain pipe 53 intrudes in the drain water accumulated in the water storage portion 67, the drain water infiltrates here and a sealing portion is provided. Therefore, the drain can be appropriately drained by preventing the inflow of the exhaust gas present in the upstream side flow passage 64 to the demister main body 52 with a simple configuration.
　第１実施形態のデミスタユニットでは、ドレン誘導部をドレン管５３とし、封止部としてドレン管５３内に貯水することで排ガスの流入を阻止している。具体的に、封止部として、ケーシング５１に貯水部６７を設け、ドレン管５３の下端部を貯水部６７のドレン水を侵入させている。従って、簡単な構成でドレン管５３を通したデミスタ本体５２への排ガスの流入を容易に防止することができ、構成の簡素化及び低コスト化することができる。 In the demister unit according to the first embodiment, the drain guiding portion is a drain pipe 53, and water is stored in the drain pipe 53 as a sealing portion to prevent the inflow of exhaust gas. Concretely, the water storage part 67 is provided in the casing 51 as a sealing part, and the drain water of the water storage part 67 is made to invade the lower end part of the drain pipe 53. As shown in FIG. Therefore, the exhaust gas can be easily prevented from flowing into the demister main body 52 through the drain pipe 53 with a simple configuration, and the configuration can be simplified and the cost can be reduced.
　第１実施形態のデミスタユニットでは、ケーシング５１内のドレンを下方に排出するドレン排出管５４と、ドレン排出管５４から排出されたドレンを貯留する貯水タンク５５とを設け、ドレン排出管５４の上端部をケーシング５１の底部５１ｅより上方に開口することで貯水部６７を設けている。従って、ケーシング５１内に貯水部６７を形成することで、容易に封止部を形成することができ、構成を簡素化することができる。 In the demister unit of the first embodiment, a drain discharge pipe 54 for discharging the drain in the casing 51 downward and a water storage tank 55 for storing the drain discharged from the drain discharge pipe 54 are provided. The water storage portion 67 is provided by opening the portion above the bottom portion 51 e of the casing 51. Therefore, by forming the water storage portion 67 in the casing 51, the sealing portion can be easily formed, and the configuration can be simplified.
　第１実施形態のデミスタユニットでは、ケーシング５１における出口部６２と貯水タンク５５の上部とを連通する連通管６８を設けている。従って、ケーシング５１における出口部６２は、ＥＧＲブロワ４７の吸引力が作用することから負圧になり、この負圧が連通管６８を通して貯水タンク５５に作用するため、ケーシング５１の出口部６２と貯水タンク５５が均圧され、ケーシング５１内で排ガスから分離されたミストをドレン排水管５４から貯水タンク５５に適正に排出することができる。また、連通管６８を設けることで、ドレン管５４の内径を小さくすることができると共に、デミスタ本体５２と貯水タンク５５とのヘッド差を小さくすることができ、装置のコンパクト化が可能となる。 In the demister unit of the first embodiment, a communication pipe 68 for communicating the outlet portion 62 of the casing 51 with the upper portion of the water storage tank 55 is provided. Accordingly, the outlet portion 62 in the casing 51 is a negative pressure due to the action of the suction force of the EGR blower 47, and this negative pressure acts on the water storage tank 55 through the communication pipe 68, so the outlet portion 62 of the casing 51 and the water storage The tank 55 is pressure-equalized, and the mist separated from the exhaust gas in the casing 51 can be properly drained from the drain drainage pipe 54 to the water storage tank 55. Further, by providing the communication pipe 68, the inner diameter of the drain pipe 54 can be reduced, and the difference in head between the demister main body 52 and the water storage tank 55 can be reduced, and the apparatus can be made compact.
　また、第１実施形態のＥＧＲシステムにあっては、エンジン本体１１から排出された排ガスの一部を燃焼用気体の一部としてエンジン本体１１に再循環する排ガス再循環ラインＧ４と、排ガス再循環ラインＧ４を流れる排ガスに対して水を噴射することで有害物質を除去するスクラバ４２と、スクラバ４２から排出された排ガスが導入されるデミスタユニット１４とを設けている。 Further, in the EGR system of the first embodiment, an exhaust gas recirculation line G4 that recirculates a part of the exhaust gas discharged from the engine body 11 to the engine body 11 as a part of the combustion gas, and an exhaust gas recirculation A scrubber 42 for removing harmful substances by injecting water to the exhaust gas flowing through the line G4 and a demister unit 14 into which the exhaust gas discharged from the scrubber 42 is introduced are provided.
　従って、エンジン本体１１から排出された排ガスは、その一部が排ガス再循環ラインＧ４を通るとき、スクラバ４２によりこの排ガス再循環ラインＧ４を流れる排ガスに対して水が噴射されることで有害物質が除去され、デミスタユニット１４により含有するミストが除去された後、エンジン本体１１に供給される。このとき、デミスタユニット１４では、排ガスがデミスタ本体５２を通過することで、含まれるミストが除去され、ドレン管５３から下方に流れ落ちる。このとき、ドレン管５３は、下端部が貯水部６７に溜まったドレン水内に侵入していることから、ここにドレン水が浸入して封止部が設けられている。そのため、入口部６１からケーシング５１内に導入された排ガスが、ドレン管５３を通してデミスタ本体５２へ逆流することはない。その結果、ドレン管５３からデミスタ本体５２へのドレン水の逆流を抑制してミスト除去効率を向上することができる。 Therefore, when exhaust gas discharged from the engine main body 11 partially passes through the exhaust gas recirculation line G4, the scrubber 42 injects water to the exhaust gas flowing through the exhaust gas recirculation line G4, so that harmful substances are discharged. After being removed and the mist contained by the demister unit 14 is removed, it is supplied to the engine main body 11. At this time, in the demister unit 14, when the exhaust gas passes through the demister main body 52, the contained mist is removed and flows downward from the drain pipe 53. At this time, since the lower end portion of the drain pipe 53 intrudes in the drain water accumulated in the water storage portion 67, the drain water infiltrates here and a sealing portion is provided. Therefore, the exhaust gas introduced into the casing 51 from the inlet portion 61 does not flow back to the demister main body 52 through the drain pipe 53. As a result, it is possible to suppress the backflow of drain water from the drain pipe 53 to the demister main body 52, and to improve the mist removal efficiency.
［第２実施形態］
　図５は、第２実施形態のデミスタユニットの入口部を表す縦断面図である。なお、上述した実施形態と同様の機能を備える部材には、同一の符号を付して詳細な説明は省略する。 Second Embodiment
FIG. 5 is a longitudinal cross-sectional view showing the entrance part of the demister unit of 2nd Embodiment. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　第２実施形態において、図５に示すように、デミスタユニット７０は、ケーシング５１と、デミスタ本体５２と、ドレン管（ドレン誘導部）７１と、ドレン排出管７２と、貯水タンク５５とを備えている。 In the second embodiment, as shown in FIG. 5, the demister unit 70 includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 71, a drain discharge pipe 72, and a water storage tank 55. There is.
　ケーシング５１は、入口部６１と出口部６２が形成され、入口部６１と出口部６２の間にデミスタ本体５２が配置されている。デミスタ本体５２は、下部にデミスタ本体５２により分離されたミストを下方に導くドレン管７１が設けられている。ドレン管７１は、直線部８１と、第１屈曲部８２と、第２屈曲部８３とから構成されている。直線部８１は、鉛直方向に沿って配設される直線状の管であり、上端部がデミスタ支持板６３を貫通してデミスタ本体５２に連結されている。第１屈曲部８２は、上方に屈曲する正面視がＵ字形状をなす曲線状の管であり、一端部が直線部８１の下端部に連結されている。第２屈曲部８３は、下方に屈曲する正面視が逆Ｕ字形状をなす曲線状の管であり、一端部が第１屈曲部８２の他端部に連結され、他端部が下方側空間部６６に対して上方に向けて開口している。 The casing 51 is formed with an inlet 61 and an outlet 62, and the demister main body 52 is disposed between the inlet 61 and the outlet 62. The demister main body 52 is provided at its lower portion with a drain pipe 71 for guiding the mist separated by the demister main body 52 downward. The drain pipe 71 includes a straight portion 81, a first bent portion 82, and a second bent portion 83. The straight portion 81 is a straight pipe disposed along the vertical direction, and the upper end portion thereof is connected to the demister main body 52 through the demister support plate 63. The first bent portion 82 is a curved tube having a U-shape in a front view bent upward, and one end portion thereof is connected to the lower end portion of the straight portion 81. The second bent portion 83 is a curved tube having an inverted U-shape in a front view bent downward, one end portion is connected to the other end portion of the first bent portion 82, and the other end portion is a lower space It opens upward to the portion 66.
　なお、ドレン管７１は、直線部８１と第１屈曲部８２と第２屈曲部８３とから構成されるものに限定されない。例えば、直線部８１と第１屈曲部８２とから構成してもよく、直線部８１と第１屈曲部８２と第２屈曲部８３に加えて直線部や屈曲部などを加えて構成してもよく、直線部８１をなくして第１屈曲部８２だけで構成してもよい。 In addition, the drain pipe 71 is not limited to what is comprised from the linear part 81, the 1st bending part 82, and the 2nd bending part 83. FIG. For example, the linear portion 81 and the first bent portion 82 may be used, or even if a linear portion or a bent portion is added to the linear portion 81, the first bent portion 82, and the second bent portion 83. Alternatively, the linear portion 81 may be eliminated and only the first bent portion 82 may be provided.
　ケーシング５１は、ドレンを外部に排出するドレン排出管７２が設けられている。ドレン排出管７２は、鉛直方向に沿って配設される直線状の管であり、上端部がケーシング５１の底部５１ｅに連結され、下端部が貯水タンク５５の上部に連結されており、ケーシング５１から排出されたドレンを貯水タンク５５に貯留することができる。 The casing 51 is provided with a drain discharge pipe 72 for discharging the drain to the outside. The drain discharge pipe 72 is a straight pipe disposed along the vertical direction, and its upper end is connected to the bottom 51 e of the casing 51 and its lower end is connected to the upper of the water storage tank 55. The drain drained from the water can be stored in the water storage tank 55.
　ケーシング５１は、底部５１ｅに傾斜板８４，８５が固定されている。この傾斜板８，８５は、ケーシング５１の底部５１ｅに開口するドレン排出管７２の上端部に向けて下方に傾斜している。この傾斜板８４，８５は、ケーシング５１に流れ込んだドレン水をドレン排出管７２に導くものである。 In the casing 51, inclined plates 84 and 85 are fixed to a bottom 51e. The inclined plates 8 and 85 are inclined downward toward the upper end portion of the drain discharge pipe 72 opened at the bottom portion 51 e of the casing 51. The inclined plates 84 and 85 guide the drain water flowing into the casing 51 to the drain discharge pipe 72.
　ドレン管７１からデミスタ本体５２への排ガスの逆流（流入）を阻止する封止部が設けられている。この封止部は、ドレン管７１に設けられる貯水部としての第１屈曲部８２であり、第２屈曲部８３を介して下方側空間部６６に開口している。ここで、封止部としての屈曲部は、正面視がＵ字形状をなす第１屈曲部８２であり、また、正面視がＳ字形状をなす第１屈曲部８２及び第２屈曲部８３である。 A sealing portion is provided to prevent the backflow (inflow) of the exhaust gas from the drain pipe 71 to the demister main body 52. The sealing portion is a first bent portion 82 as a water storage portion provided in the drain pipe 71, and is opened to the lower side space portion 66 via the second bent portion 83. Here, the bending portion as the sealing portion is the first bending portion 82 in which the front view is U-shaped, and the first bending portion 82 and the second bending portion 83 in which the front view is S-shaped. is there.
　そのため、入口部６１からケーシング５１内の上流側流路６４に導入された排ガスは、正面にあるデミスタ本体５２に流入し、複数回屈曲した流路の板状体に衝突することで、含まれるミストがこの板状体に付着する。すると、デミスタ本体５２の板状体に付着したミストは、自重により下方へ流れ落ち、デミスタ支持板６３を貫通するドレン管７１の上部開口に流入する。そして、ドレン管７１内に流入したミストは、内部を通ってケーシング５１の下方側空間部６６に流れ落ちる。 Therefore, the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is included by colliding with the plate body of the flow passage bent a plurality of times. Mist adheres to this plate. Then, the mist attached to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 71 penetrating the demister support plate 63. Then, the mist that has flowed into the drain pipe 71 flows into the lower side space portion 66 of the casing 51 through the inside.
　ドレン管７１は、直線部８１と第１屈曲部８２と第２屈曲部８３とから構成されることから、ドレン管７１内に流入したミストは、直線部８１から第１屈曲部８２に至り、この第１屈曲部８２に一時的に溜まってから第２屈曲部８３に押し出され、ケーシング５１の下方側空間部６６に流れ落ちる。そして、ドレン管７１からケーシング５１内に流れ落ちたドレン水は、傾斜板８４，８５によりドレン排出管５４に流入し、このドレン排出管５４を通して貯水タンク５５に排出される。 Since the drain pipe 71 includes the straight portion 81, the first bent portion 82, and the second bent portion 83, the mist flowing into the drain pipe 71 extends from the straight portion 81 to the first bent portion 82, After temporarily accumulated in the first bending portion 82, the first bending portion 82 is pushed out to the second bending portion 83 and flows into the lower side space portion 66 of the casing 51. The drain water which has fallen from the drain pipe 71 into the casing 51 flows into the drain discharge pipe 54 by the inclined plates 84 and 85 and is discharged to the water storage tank 55 through the drain discharge pipe 54.
　また、ドレン管７１は、第１屈曲部８２にドレン水が溜まることで封止部が形成される。そのため、入口部６１から上流側流路６４に導入された排ガスがドレン管７１の下部から吸入されてデミスタ本体５２に逆流することが防止される。また、下流側通路６５と貯水タンク５５が連通管６８により連通されていることから、この下流側通路６５と貯水タンク５５の内部が均圧されるため、この点でも、排ガスがドレン管７１の下部からデミスタ本体５２に逆流することが防止される。 In addition, in the drain pipe 71, a drain water is accumulated in the first bent portion 82 to form a sealed portion. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the lower portion of the drain pipe 71 and flowing back to the demister main body 52. Further, since the downstream side passage 65 and the water storage tank 55 communicate with each other by the communication pipe 68, the pressure in the downstream side passage 65 and the water storage tank 55 is equalized. Backflow from the bottom to the demister main body 52 is prevented.
　一方、デミスタ本体５２によりミストが除去された排ガスは、下流側流路６５を通って出口部６２から排出される。 On the other hand, the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
　このように第２実施形態のデミスタユニットにあっては、デミスタ本体５２の下部に連結されてデミスタ本体５２により分離されたミストを下方に導くドレン管（ドレン誘導部）７１と、ドレン管７１からデミスタ本体５２への排ガスの流入を阻止する貯水部（封止部）としての第１屈曲部８２とを設けている。 As described above, in the demister unit of the second embodiment, the drain pipe (drain guiding portion) 71 which is connected to the lower portion of the demister main body 52 and guides the mist separated by the demister main body 52 downward; A first bent portion 82 as a water storage portion (sealing portion) for blocking the inflow of exhaust gas into the demister main body 52 is provided.
　従って、入口部６１からケーシング５１内に導入された排ガスは、デミスタ本体５２を通過することで、含まれるミストが除去され、このミストは、自重によりドレン管７１から下方に流れ落ちる。このとき、ドレン管７１は、第１屈曲部８２にドレン水が溜まることで封止部が設けられている。そのため、入口部６１からケーシング５１内に導入された排ガスが、ドレン管７１を通してデミスタ本体５２へ逆流することはない。その結果、ドレン管７１からデミスタ本体５２へのドレン水の逆流を抑制してミスト除去効率を向上することができる。 Therefore, the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52 to remove the contained mist, and the mist flows downward from the drain pipe 71 by its own weight. At this time, the drain pipe 71 is provided with a sealing portion by the drain water accumulating in the first bent portion 82. Therefore, the exhaust gas introduced into the casing 51 from the inlet portion 61 does not flow back to the demister main body 52 through the drain pipe 71. As a result, it is possible to suppress the backflow of drain water from the drain pipe 71 to the demister main body 52, and to improve the mist removal efficiency.
　また、ドレン管７１に第１屈曲部８２を形成することで、ドレン水が溜まる封止部を設けており、ドレン管７１の形状を変更するだけでよく、ケーシング５１を変更することはなく、全体構成を簡素化することができる。 Further, by forming the first bent portion 82 in the drain pipe 71, a sealing portion in which the drain water is accumulated is provided, and the shape of the drain pipe 71 only needs to be changed, and the casing 51 is not changed. The whole configuration can be simplified.
　第２実施形態のデミスタユニットでは、ドレン管７１を、上端部がデミスタ本体５２の下部に連結される直線部８１と、直線部８１の下端部に連結されて上方に屈曲する第１屈曲部８２とから構成している。従って、第１屈曲部８２により、簡単な構成で容易にデミスタ本体５２への上流側流路６４に存在する排ガスの流入を防ぐことで適切にドレンを排出することができる。 In the demister unit of the second embodiment, the drain pipe 71 has a straight portion 81 whose upper end is connected to the lower portion of the demister main body 52, and a first bent portion 82 connected to the lower end of the straight portion 81 and bent upward. And consists of. Therefore, the drain can be appropriately drained by preventing the inflow of the exhaust gas present in the upstream side flow passage 64 to the demister main body 52 with the simple configuration and the simple configuration.
　第２実施形態のデミスタユニットでは、ドレン管７１をケーシング５１内に開口している。従って、ドレン管７１を小型化することができ、製造コストを低減することができる。 In the demister unit of the second embodiment, the drain pipe 71 is opened in the casing 51. Therefore, the drain pipe 71 can be miniaturized, and the manufacturing cost can be reduced.
［第３実施形態］
　図６は、第３実施形態のデミスタユニットの入口部を表す縦断面図、図７は、ドレン管とドレン排出管との連結部を表す側面図である。なお、上述した実施形態と同様の機能を備える部材には、同一の符号を付して詳細な説明は省略する。 Third Embodiment
FIG. 6 is a longitudinal sectional view showing the inlet of the demister unit according to the third embodiment, and FIG. 7 is a side view showing the connection between the drain pipe and the drain pipe. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　第３実施形態において、図６及び図７に示すように、デミスタユニット９０は、ケーシング５１と、デミスタ本体５２と、ドレン管（ドレン誘導部）９１と、ドレン排出管７２と、貯水タンク５５とを備えている。 In the third embodiment, as shown in FIGS. 6 and 7, the demister unit 90 includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 91, a drain discharge pipe 72, and a water storage tank 55. Is equipped.
　ケーシング５１は、入口部６１と出口部６２が形成され、入口部６１と出口部６２の間にデミスタ本体５２が配置されている。デミスタ本体５２は、下部にデミスタ本体５２により分離されたミストを下方に導くドレン管９１が設けられている。ドレン管９１は、直線部１０１と、第１屈曲部１０２と、第２屈曲部１０３と、第３屈曲部１０４とから構成されている。 The casing 51 is formed with an inlet 61 and an outlet 62, and the demister main body 52 is disposed between the inlet 61 and the outlet 62. The demister main body 52 is provided at its lower portion with a drain pipe 91 for guiding the mist separated by the demister main body 52 downward. The drain pipe 91 is configured of a straight portion 101, a first bent portion 102, a second bent portion 103, and a third bent portion 104.
　直線部１０１は、鉛直方向に沿って配設される直線状の管であり、ケーシング５１の下方側空間部６６内に配置され、上端部がデミスタ支持板６３を貫通してデミスタ本体５２に連結され、下端部がケーシング５１の底部５１ｅに開口して連結されている。第１、第２、第３屈曲部１０２，１０３，１０４は、ケーシング５１の下方の外側に配置されている。第１屈曲部１０２は、上方に屈曲する正面視がＵ字形状をなす曲線状の管であり、一端部が直線部１０１の下端部に連結されている。第２屈曲部１０３は、下方に屈曲する正面視が逆Ｕ字形状をなす曲線状の管であり、一端部が第１屈曲部１０２の他端部に連結されている。第３屈曲部１０４は、９０度に湾曲する曲線状の管であり、一端部が第２屈曲部１０３の下端部にフランジ１０５を介して連結されている。 The straight portion 101 is a straight pipe disposed along the vertical direction, and is disposed in the lower space portion 66 of the casing 51, and the upper end portion thereof penetrates the demister support plate 63 and is connected to the demister main body 52. The lower end portion is openly connected to the bottom portion 51 e of the casing 51. The first, second, and third bent portions 102, 103, and 104 are disposed outside the lower side of the casing 51. The first bent portion 102 is a curved tube having a U-shape in a front view bent upward, and one end portion thereof is connected to the lower end portion of the straight portion 101. The second bent portion 103 is a curved tube having a reverse U-shape in a front view bent downward, and one end portion thereof is connected to the other end portion of the first bent portion 102. The third bent portion 104 is a curved tube that curves at 90 degrees, and one end thereof is connected to the lower end portion of the second bent portion 103 via the flange 105.
　ケーシング５１は、下部にドレンを外部の下方に排出するドレン排出管７２が設けられており、上端部がケーシング５１の底部５１ｅに連結され、下端部が貯水タンク５５の上部に連結されている。ドレン管９１は、第３屈曲部１０４の他端部が上下方向における中途部に連結されている。 The casing 51 is provided at its lower portion with a drain discharge pipe 72 for discharging the drain downward to the outside, and its upper end is connected to the bottom 51 e of the casing 51 and its lower end is connected to the top of the water storage tank 55. In the drain pipe 91, the other end of the third bent portion 104 is connected to a middle portion in the vertical direction.
　ドレン管９１からデミスタ本体５２への排ガスの逆流（流入）を阻止する封止部が設けられている。この封止部は、ドレン管９１に設けられる貯水部としての第１屈曲部１０２であり、第２屈曲部１０３及び第３屈曲部１０４を介してドレン排出管７２に連通している。ここで、封止部としての屈曲部は、正面視がＵ字形状をなす第１屈曲部１０２である。 A sealing portion is provided to prevent the backflow (inflow) of the exhaust gas from the drain pipe 91 to the demister main body 52. The sealing portion is a first bent portion 102 as a water storage portion provided in the drain pipe 91, and is in communication with the drain discharge pipe 72 via the second bent portion 103 and the third bent portion 104. Here, the bent portion as the sealing portion is the first bent portion 102 that is U-shaped in a front view.
　そのため、入口部６１からケーシング５１内の上流側流路６４に導入された排ガスは、正面にあるデミスタ本体５２に流入し、複数回屈曲した流路の板状体に衝突することで、含まれるミストがこの板状体に付着する。すると、デミスタ本体５２の板状体に付着したミストは、自重により下方へ流れ落ち、デミスタ支持板６３を貫通するドレン管９１の上部開口に流入する。そして、ドレン管９１内に流入したミストは、内部を通ってケーシング５１の下方側空間部６６に流れ落ちる。 Therefore, the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is included by colliding with the plate body of the flow passage bent a plurality of times. Mist adheres to this plate. Then, the mist adhering to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 91 penetrating the demister support plate 63. Then, the mist that has flowed into the drain pipe 91 flows down to the lower side space portion 66 of the casing 51 through the inside.
　ドレン管９１は、直線部１０１と第１屈曲部１０２と第２屈曲部１０３と第３屈曲部１０４とから構成されることから、ドレン管９１内に流入したミストは、直線部１０１から第１屈曲部１０２に至り、この第２屈曲部１０２に一時的に溜まってから第２屈曲部１０３に押し出され、第３屈曲部１０４を通ってドレン排出管７２に流入する。そして、ドレン管９１からドレン排出管７２に流入したドレン水は、このドレン排出管７２を通して貯水タンク５５に排出される。 Since the drain pipe 91 is composed of the straight portion 101, the first bent portion 102, the second bent portion 103, and the third bent portion 104, the mist which has flowed into the drain pipe 91 is the first from the straight portion 101. It reaches the bent portion 102, is temporarily accumulated in the second bent portion 102, is pushed out to the second bent portion 103, and flows into the drain pipe 72 through the third bent portion 104. The drain water flowing from the drain pipe 91 into the drain discharge pipe 72 is discharged to the water storage tank 55 through the drain discharge pipe 72.
　また、ドレン管９１は、第１屈曲部１０２にドレン水が溜まることで封止部が形成される。そのため、入口部６１から上流側流路６４に導入された排ガスがドレン管９１の下部から吸入されてデミスタ本体５２に逆流することが防止される。 In addition, in the drain pipe 91, a drain water is accumulated in the first bent portion 102 to form a sealed portion. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the lower portion of the drain pipe 91 and flowing back to the demister main body 52.
　一方、デミスタ本体５２によりミストが除去された排ガスは、下流側流路６５を通って出口部６２から排出される。 On the other hand, the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
　このように第３実施形態のデミスタユニットにあっては、デミスタ本体５２の下部に連結されてデミスタ本体５２により分離されたミストを下方に導くドレン管（ドレン誘導部）９１と、ドレン管９１からデミスタ本体５２への排ガスの流入を阻止する貯水部（封止部）としての第１屈曲部１０２とを設けている。 Thus, in the demister unit of the third embodiment, a drain pipe (drain guiding portion) 91 which is connected to the lower part of the demister main body 52 and guides the mist separated by the demister main body 52 downward, and from the drain pipe 91 A first bent portion 102 as a water storage portion (sealing portion) for blocking the inflow of exhaust gas into the demister main body 52 is provided.
　従って、入口部６１からケーシング５１内に導入された排ガスは、デミスタ本体５２を通過することで、含まれるミストが除去され、このミストは、自重によりドレン管９１から下方に流れ落ちる。このとき、ドレン管９１は、第１屈曲部１０２にドレン水が溜まることで封止部が設けられている。そのため、入口部６１からケーシング５１内に導入された排ガスが、ドレン管９１を通してデミスタ本体５２へ逆流することはない。その結果、ドレン管９１からデミスタ本体５２へのドレン水の逆流を抑制してミスト除去効率を向上することができる。 Therefore, the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52 to remove the contained mist, and the mist flows downward from the drain pipe 91 by its own weight. At this time, the drain pipe 91 is provided with a sealing portion by the drain water accumulating in the first bent portion 102. Therefore, the exhaust gas introduced into the casing 51 from the inlet 61 does not flow back to the demister main body 52 through the drain pipe 91. As a result, it is possible to suppress the backflow of drain water from the drain pipe 91 to the demister main body 52, and to improve the mist removal efficiency.
　第３実施形態のデミスタユニットでは、ドレン管９１の下端部をドレン排出管７２の中途部に連結している。従って、デミスタ本体５２で排ガスから分離したミストをドレン管９１により直接ドレン排出管７２に流すこととなり、ケーシング５１内でのドレン水の増大を抑制することができる。 In the demister unit of the third embodiment, the lower end portion of the drain pipe 91 is connected to the middle portion of the drain discharge pipe 72. Therefore, the mist separated from the exhaust gas by the demister main body 52 is made to flow directly to the drain discharge pipe 72 by the drain pipe 91, and the increase of the drain water in the casing 51 can be suppressed.
　第３実施形態のデミスタユニットでは、ドレン管９１は、第１、第２、第３屈曲部１０２，１０３，１０４をケーシング５１の外側に配置することで、封止部を構成する第１屈曲部１０２をケーシング５１の外部に位置させている。従って、第１、第２、第３屈曲部１０２，１０３，１０４が異物により閉塞したとき、第１、第２、第３屈曲部１０２，１０３，１０４を取外して異物を除去することができ、メンテナンス性を向上することができる。 In the demister unit of the third embodiment, the drain pipe 91 is a first bent portion forming a sealing portion by arranging the first, second, and third bent portions 102, 103, and 104 on the outside of the casing 51. The position 102 is located outside the casing 51. Therefore, when the first, second, and third bent portions 102, 103, and 104 are closed by the foreign matter, the first, second, and third bent portions 102, 103, and 104 can be removed to remove the foreign matter. Maintenance can be improved.
［第４実施形態］
　図８は、第４実施形態のデミスタユニットを表す縦断面図である。なお、上述した実施形態と同様の機能を備える部材には、同一の符号を付して詳細な説明は省略する。 Fourth Embodiment
FIG. 8 is a longitudinal sectional view showing a demister unit of a fourth embodiment. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　第４実施形態において、図８に示すように、デミスタユニット１１０は、ケーシング５１と、デミスタ本体５２と、ドレン管（ドレン誘導部）１１１と、ドレン排出管７２と、貯水タンク５５とを備えている。 In the fourth embodiment, as shown in FIG. 8, the demister unit 110 includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 111, a drain discharge pipe 72, and a water storage tank 55. There is.
　ケーシング５１は、入口部６１と出口部６２が形成され、入口部６１と出口部６２の間にデミスタ本体５２が配置されている。デミスタ本体５２は、下部にデミスタ本体５２により分離されたミストを下方に導くドレン管１１１が設けられている。ドレン管１１１は、直線部１２１と、屈曲部１２２とから構成されている。 The casing 51 is formed with an inlet 61 and an outlet 62, and the demister main body 52 is disposed between the inlet 61 and the outlet 62. The demister main body 52 is provided at its lower portion with a drain pipe 111 for guiding the mist separated by the demister main body 52 downward. The drain pipe 111 is composed of a straight portion 121 and a bent portion 122.
　直線部１２１は、鉛直方向に沿って配設される直線状の管であり、ケーシング５１の下方側空間部６６内に配置され、上端部がデミスタ支持板６３を貫通してデミスタ本体５２に連結され、下端部がケーシング５１の底部５１ｅに開口して連結されている。屈曲部１２２は、上方に屈曲する正面視がＵ字形状をなす曲線状の管であり、ケーシング５１の下方の外部に配置されている。屈曲部１２２は、一端部が直線部１２１の下端部に連結され、他端部が底部５１ｅに開口して上流側流路６４に連結されている。ケーシング５１は、下部にドレンを外部の下方に排出するドレン排出管７２が設けられており、上端部がケーシング５１の底部５１ｅに連結され、下端部が貯水タンク５５の上部に連結されている。 The straight portion 121 is a straight pipe disposed along the vertical direction, and is disposed in the lower space portion 66 of the casing 51, and the upper end portion thereof penetrates the demister support plate 63 and is connected to the demister main body 52 The lower end portion is openly connected to the bottom portion 51 e of the casing 51. The bent portion 122 is a curved tube having a U-shaped front view that is bent upward, and is disposed outside the lower portion of the casing 51. One end portion of the bending portion 122 is connected to the lower end portion of the straight portion 121, and the other end portion is connected to the upstream side flow passage 64 so as to open to the bottom portion 51e. The casing 51 is provided at its lower portion with a drain discharge pipe 72 for discharging the drain downward to the outside, and its upper end is connected to the bottom 51 e of the casing 51 and its lower end is connected to the top of the water storage tank 55.
　ドレン管１１１からデミスタ本体５２への排ガスの逆流（流入）を阻止する封止部が設けられている。この封止部は、ドレン管１１１に設けられる貯水部としての屈曲部１２２である。ここで、封止部としての屈曲部は、正面視がＵ字形状をなす屈曲部１２２である。 A seal is provided to prevent backflow (inflow) of the exhaust gas from the drain pipe 111 to the demister main body 52. The sealing portion is a bent portion 122 as a water storage portion provided in the drain pipe 111. Here, the bent portion as the sealing portion is a bent portion 122 which is U-shaped in a front view.
　そのため、入口部６１からケーシング５１内の上流側流路６４に導入された排ガスは、正面にあるデミスタ本体５２に流入し、複数回屈曲した流路の板状体に衝突することで、含まれるミストがこの板状体に付着する。すると、デミスタ本体５２の板状体に付着したミストは、自重により下方へ流れ落ち、デミスタ支持板６３を貫通するドレン管１１１の上部開口に流入する。また、入口部６１からケーシング５１内に導入された排ガスは、ドレン水を帯同しており、このドレン水が上流側流路６４からドレン管１１１に流入する。 Therefore, the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is included by colliding with the plate body of the flow passage bent a plurality of times. Mist adheres to this plate. Then, the mist attached to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 111 penetrating the demister support plate 63. Further, the exhaust gas introduced into the casing 51 from the inlet portion 61 has drain water, and this drain water flows into the drain pipe 111 from the upstream side flow path 64.
　ドレン管１１１は、屈曲部１２２が設けられていることから、ドレン管１１１内に流入したミストや上流側流路６４からドレン管１１１に流入したドレン水は、この屈曲部１２２に一時的に溜まり、封止部が形成される。その後、屈曲部１２２がドレン水で充満されると、ドレン管１１１内に流入したミストは、内部を通って上流側流路６４に押し出される。そして、ドレン管１１１から上流側流路６４に流入したドレン水は、ドレン排出管７２を通して貯水タンク５５に排出される。 Since the drain pipe 111 is provided with the bent portion 122, the mist flowing into the drain pipe 111 and the drain water flowing into the drain pipe 111 from the upstream side channel 64 temporarily accumulate in the bent portion 122. , The sealing portion is formed. Thereafter, when the bent portion 122 is filled with drain water, the mist that has flowed into the drain pipe 111 is pushed out to the upstream channel 64 through the inside. Then, the drain water flowing from the drain pipe 111 into the upstream channel 64 is discharged to the water storage tank 55 through the drain discharge pipe 72.
　また、ドレン管１１１は、屈曲部１２２にドレン水が溜まることで封止部が形成される。そのため、入口部６１から上流側流路６４に導入された排ガスがドレン管１１１から吸入してデミスタ本体５２に逆流することが防止される。また、下流側通路６５と貯水タンク５５が連通管６８により連通されていることから、この下流側通路６５と貯水タンク５５の内部が均圧されるため、この点でも、排ガスがドレン管１１１の下部からデミスタ本体５２に逆流することが防止される。 In addition, in the drain pipe 111, a drain water is accumulated in the bent portion 122 to form a sealed portion. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the drain pipe 111 and backflowing to the demister main body 52. Further, since the downstream side passage 65 and the water storage tank 55 communicate with each other through the communication pipe 68, the pressure in the downstream side passage 65 and the inside of the water storage tank 55 is equalized. Backflow from the bottom to the demister main body 52 is prevented.
　一方、デミスタ本体５２によりミストが除去された排ガスは、下流側流路６５を通って出口部６２から排出される。 On the other hand, the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
　このように第４実施形態のデミスタユニットにあっては、デミスタ本体５２の下部に連結されてデミスタ本体５２により分離されたミストを下方に導くドレン管（ドレン誘導部）１１１と、ドレン管１１１からデミスタ本体５２への排ガスの流入を阻止する貯水部（封止部）としての屈曲部１２２とを設けている。 As described above, in the demister unit of the fourth embodiment, the drain pipe (drain guiding portion) 111 which is connected to the lower portion of the demister main body 52 and guides the mist separated by the demister main body 52 downward; A bent portion 122 as a water storage portion (sealing portion) for blocking the inflow of exhaust gas into the demister main body 52 is provided.
　従って、入口部６１からケーシング５１内に導入された排ガスは、デミスタ本体５２を通過することで、含まれるミストが除去され、このミストは、自重によりドレン管１１１から上流側流路６４に流れる。このとき、ドレン管１１１は、屈曲部１２２にドレン水が溜まることで封止部が設けられている。そのため、入口部６１から上流側流路６４に導入された排ガスが、ドレン管１１１を通してデミスタ本体５２へ逆流することが防止される。その結果、ドレン管１１１からデミスタ本体５２へのドレン水の逆流を抑制してミスト除去効率を向上することができる。 Accordingly, the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52, whereby the contained mist is removed, and the mist flows from the drain pipe 111 to the upstream side flow passage 64 by its own weight. At this time, the drain pipe 111 is provided with a sealed portion by the drain water being accumulated in the bent portion 122. Therefore, the exhaust gas introduced into the upstream side flow path 64 from the inlet portion 61 is prevented from flowing back to the demister main body 52 through the drain pipe 111. As a result, it is possible to suppress the backflow of drain water from the drain pipe 111 to the demister main body 52, and to improve the mist removal efficiency.
　第４実施形態のデミスタユニットでは、ドレン管１１１に屈曲部１２２を設け、下端部を上流側流路６４に連通している。従って、排ガスに帯同する排水（点線の矢印）を屈曲部１２２に供給して早期に水封することができる。 In the demister unit of the fourth embodiment, the drain pipe 111 is provided with a bent portion 122, and the lower end portion is in communication with the upstream side flow passage 64. Therefore, it is possible to supply the drainage (dotted line arrow) drained to the exhaust gas to the bent portion 122 and to seal the water early.
　第４実施形態のデミスタユニットでは、ドレン管１１１の屈曲部１２２をケーシング５１の外側に配置している。従って、屈曲部１２２が異物により閉塞したとき、この屈曲部１２２を取外して異物を除去することができ、メンテナンス性を向上することができる。 In the demister unit of the fourth embodiment, the bent portion 122 of the drain pipe 111 is disposed outside the casing 51. Therefore, when the bending portion 122 is blocked by a foreign object, the bending portion 122 can be removed to remove the foreign object, and the maintainability can be improved.
［第５実施形態］
　図９は、第５実施形態のデミスタユニットを表す縦断面図、図１０は、仕切板を表す斜視図である。なお、上述した実施形態と同様の機能を備える部材には、同一の符号を付して詳細な説明は省略する。 Fifth Embodiment
FIG. 9 is a longitudinal sectional view showing a demister unit of a fifth embodiment, and FIG. 10 is a perspective view showing a partition plate. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　第５実施形態において、図９及び図１０に示すように、デミスタユニット１３０は、ケーシング５１と、デミスタ本体５２と、ドレン管（ドレン誘導部）１３１と、ドレン排出管７２と、貯水タンク５５とを備えている。 In the fifth embodiment, as shown in FIGS. 9 and 10, the demister unit 130 includes a casing 51, a demister main body 52, a drain pipe (drain guiding portion) 131, a drain discharge pipe 72, and a water storage tank 55. Is equipped.
　ケーシング５１は、入口部６１と出口部６２が形成され、入口部６１と出口部６２の間にデミスタ本体５２が配置されている。デミスタ本体５２は、下部にデミスタ本体５２により分離されたミストを下方に導くドレン管１３１が設けられている。ドレン管１３１は、約９０度に屈曲した湾曲状をなす管であり、ケーシング５１の下方側空間部６６内に配置され、上端部がデミスタ支持板６３を貫通してデミスタ本体５２に連結され、下端部が隔壁部１２３に開口して上流側流路６４に連結されている。ケーシング５１は、下部にドレンを外部の下方に排出するドレン排出管７２が設けられており、上端部がケーシング５１の底部５１ｅに連結され、下端部が貯水タンク５５の上部に連結されている。 The casing 51 is formed with an inlet 61 and an outlet 62, and the demister main body 52 is disposed between the inlet 61 and the outlet 62. The demister main body 52 is provided at its lower portion with a drain pipe 131 for guiding the mist separated by the demister main body 52 downward. The drain pipe 131 is a curved pipe bent at about 90 degrees, and is disposed in the lower side space 66 of the casing 51, and the upper end thereof penetrates the demister support plate 63 and is connected to the demister main body 52, The lower end portion is opened to the partition wall portion 123 and connected to the upstream side flow path 64. The casing 51 is provided at its lower portion with a drain discharge pipe 72 for discharging the drain downward to the outside, and its upper end is connected to the bottom 51 e of the casing 51 and its lower end is connected to the top of the water storage tank 55.
　ドレン管１３１からデミスタ本体５２への排ガスの逆流（流入）を阻止する封止部が設けられている。ケーシング５１は、上流側流路６４における底部５１ｅの上面部に仕切板１４１が固定されている。この仕切板１４１は、隔壁部１２３と所定間隔を空けて平行をなすように配置されており、下端部に複数の排出孔１４２が形成されている。ここで、複数の排出孔１４２は、異物およびドレン水を排出することができる。上述した封止部は、ケーシング５１の上流側流路６４にて、隔壁部１２３と仕切板１４１により設けられる貯水部１４３であり、ドレン管１３１の他端部が隔壁部１２３を貫通して連通している。 A seal is provided to prevent the backflow (inflow) of the exhaust gas from the drain pipe 131 to the demister main body 52. In the casing 51, the partition plate 141 is fixed to the upper surface portion of the bottom portion 51 e in the upstream side flow passage 64. The partition plate 141 is disposed parallel to the partition wall portion 123 at a predetermined interval, and a plurality of discharge holes 142 are formed at the lower end portion. Here, the plurality of discharge holes 142 can discharge foreign matter and drain water. The above-mentioned sealing part is the water storage part 143 provided by the partition part 123 and the partition plate 141 in the upstream side flow path 64 of the casing 51, and the other end part of the drain pipe 131 penetrates the partition part 123 to communicate doing.
　そのため、入口部６１からケーシング５１内の上流側流路６４に導入された排ガスは、正面にあるデミスタ本体５２に流入し、複数回屈曲した流路の板状体に衝突することで、含まれるミストがこの板状体に付着する。すると、デミスタ本体５２の板状体に付着したミストは、自重により下方へ流れ落ち、デミスタ支持板６３を貫通するドレン管１３１の上部開口に流入する。そして、ドレン管１３１内に流入したミストは、内部を通ってケーシング５１の上流側流路６４に流れる。 Therefore, the exhaust gas introduced from the inlet 61 into the upstream flow passage 64 in the casing 51 flows into the demister main body 52 in the front, and is included by colliding with the plate body of the flow passage bent a plurality of times. Mist adheres to this plate. Then, the mist attached to the plate-like body of the demister main body 52 flows downward by its own weight and flows into the upper opening of the drain pipe 131 penetrating the demister support plate 63. Then, the mist that has flowed into the drain pipe 131 flows into the upstream side flow path 64 of the casing 51 through the inside.
　上流側流路６４は、仕切板１４１により貯水部１４３が設けられ、ドレン管１３１の下端部が貯水部１４３に連通していることから、ドレン管１３１内に流入したミストは、上流側流路６４の貯水部１４３に流れる。そして、ドレン管１３１から貯水部１４３に流れたドレン水は、複数の排出孔１４２を通って、または、仕切板１４１をオーバーフローしてドレン排出管７２に流入し、このドレン排出管７２を通して貯水タンク５５に排出される。 In the upstream channel 64, the water storage section 143 is provided by the partition plate 141, and the lower end of the drain pipe 131 communicates with the water reservoir section 143. Therefore, the mist flowing into the drain pipe 131 is the upstream channel It flows to the 64 water reservoirs 143. The drain water flowing from the drain pipe 131 to the water storage portion 143 flows into the drain discharge pipe 72 through the plurality of discharge holes 142 or overflows the partition plate 141, and flows into the water storage tank through the drain discharge pipe 72. It is discharged to 55.
　また、ドレン管１３１は、貯水部１４３にドレン水が溜まることで封止部が形成される。そのため、入口部６１から上流側流路６４に導入された排ガスがドレン管１３１から吸入してデミスタ本体５２に逆流することが防止される。また、排ガスのドレン水は、未燃の燃料やオイルなどが異物として混入しており、この異物が貯水部１４３に溜まってドレン水の貯留量を減少させてしまうおそれがある。しかし、ドレン水に混入した異物は、複数の排出孔１４２により貯水部１４３から排出されることとなり、貯水部１４３の貯水量を減少させることはない。 In addition, in the drain pipe 131, the drain water is accumulated in the water storage portion 143 to form a sealed portion. Therefore, the exhaust gas introduced from the inlet portion 61 into the upstream flow passage 64 is prevented from being sucked from the drain pipe 131 and backflowing to the demister main body 52. In addition, unburned fuel, oil, and the like are mixed as foreign matter in the drain water of the exhaust gas, and the foreign matter may be accumulated in the water storage portion 143 to reduce the storage amount of drain water. However, the foreign matter mixed in the drain water is discharged from the water storage portion 143 by the plurality of water discharge holes 142, and the water storage amount of the water storage portion 143 is not reduced.
　一方、デミスタ本体５２によりミストが除去された排ガスは、下流側流路６５を通って出口部６２から排出される。 On the other hand, the exhaust gas from which the mist has been removed by the demister main body 52 is discharged from the outlet 62 through the downstream flow passage 65.
　このように第５実施形態のデミスタユニットにあっては、デミスタ本体５２の下部に連結されてデミスタ本体５２により分離されたミストを下方に導くドレン管（ドレン誘導部）１３１を設けると共に、ケーシング５１の底部５１ｅの上面に仕切板１４１を固定することで貯水部（封止部）１４３を設け、ドレン管１３１の下端部を貯水部１４３に連通している。 Thus, in the demister unit of the fifth embodiment, a drain pipe (drain guiding portion) 131 is provided which is connected to the lower part of the demister main body 52 and guides the mist separated by the demister main body 52 downward. The water storage portion (sealing portion) 143 is provided by fixing the partition plate 141 on the upper surface of the bottom portion 51 e of the second embodiment, and the lower end portion of the drain pipe 131 communicates with the water storage portion 143.
　従って、入口部６１からケーシング５１内に導入された排ガスは、デミスタ本体５２を通過することで、含まれるミストが除去され、このミストは、自重によりドレン管１３１から貯水部１４３に流れる。このとき、ドレン管１３１は、下端部が貯水部に溜まるドレン水に連通することで封止部が設けられている。そのため、入口部６１からケーシング５１内に導入された排ガスが、ドレン管１３１を通してデミスタ本体５２へ逆流することはない。その結果、ドレン管１３１からデミスタ本体５２へのドレン水の逆流を抑制してミスト除去効率を向上することができる。 Therefore, the exhaust gas introduced into the casing 51 from the inlet portion 61 passes through the demister main body 52 to remove the contained mist, and this mist flows from the drain pipe 131 to the water storage portion 143 by its own weight. At this time, the drain pipe 131 is provided with a sealing portion by the lower end portion communicating with drain water accumulated in the water storage portion. Therefore, the exhaust gas introduced into the casing 51 from the inlet 61 does not flow back to the demister main body 52 through the drain pipe 131. As a result, it is possible to suppress the backflow of drain water from the drain pipe 131 to the demister main body 52, and to improve the mist removal efficiency.
　第５実施形態のデミスタユニットでは、仕切板１４１に貯水部１４３から異物及びドレン水を排出する排出孔１４２を形成している。従って、貯水部１４３に溜まった異物及びドレン水を排出孔１４２から容易に排出することができる。 In the demister unit of the fifth embodiment, a discharge hole 142 for discharging foreign matter and drain water from the water storage section 143 is formed in the partition plate 141. Therefore, foreign matter and drain water accumulated in the water storage portion 143 can be easily discharged from the discharge hole 142.
　なお、上述した第４、第５実施形態にて、隔壁部１２３により上流側流路６４と下方側空間部６６とを区画したが、この隔壁部１２３により下方側空間部６６を構成するケーシング５１における下流側壁部５１ｂの下側の一部と底部５１ｅの下流側の一部をなくしてもよい。即ち、ドレン管１１１の直線部１２１とドレン管１３１をケーシング５１の外部に配置してもよい。 In the fourth and fifth embodiments described above, the upstream side flow passage 64 and the lower side space portion 66 are divided by the partition portion 123. However, the casing 51 constituting the lower side space portion 66 by the partition portion 123 The lower part of the downstream side wall 51b and the downstream part of the bottom 51e may be eliminated. That is, the straight portion 121 of the drain pipe 111 and the drain pipe 131 may be disposed outside the casing 51.
　また、上述した実施形態にて、ドレン管５３，７１，９１，１１１，１３１やドレン排水管５４を１本として説明したが、複数本設けてもよい。また、ケーシング５１の出口部６２と貯水タンク５５の上部とを連通する連通管６８をケーシング５１の外側に設けたが、連通管６８の一部をケーシング５１内に配置してもよい。 Moreover, although the drain pipe 53, 71, 91, 111, 131 and the drain drain pipe 54 were demonstrated as one pipe | tube in embodiment mentioned above, you may provide more than one. Further, although the communication pipe 68 communicating the outlet portion 62 of the casing 51 with the upper portion of the water storage tank 55 is provided outside the casing 51, a part of the communication pipe 68 may be disposed in the casing 51.
　また、上述した実施形態では、舶用ディーゼルエンジンとして、主機関を用いて説明したが、発電機として用いられるディーゼルエンジンにも適用することができる。 Moreover, in embodiment mentioned above, although demonstrated using the main engine as a marine diesel engine, it is applicable also to the diesel engine used as a generator.
　１０　舶用ディーゼルエンジン
　１１　エンジン本体
　１２　過給機
　１３　ＥＧＲシステム
　１４，７０，９０，１１０，１３０　デミスタユニット
　４１Ａ　ＥＧＲ入口バルブ
　４１Ｂ　ＥＧＲ出口バルブ
　４２　スクラバ
　４７　ＥＧＲブロワ
　４８　エアクーラ（冷却器）
　５１　ケーシング
　５２　デミスタ本体
　５３，７１，９１，１１１，１３１　ドレン管（ドレン誘導部）
　５４，７２　ドレン排出管
　５５　貯水タンク
　６１　入口部
　６２　出口部
　６３　デミスタ支持板
　６７，１４３　貯水部（封止部）
　６８　連通管
　８１，１２１　直線部
　８２，１２２　第１屈曲部（封止部、貯水部）
　８３　第２屈曲部
　８４，８５　傾斜板
　１２３　隔壁部
　１４１　仕切板
　１４２　排出孔
　Ｇ４，Ｇ５，Ｇ７　排ガス再循環ライン
　Ｇ６　吸入ライン
　Ｗ１　排水循環ライン 10 Marine Diesel Engine 11 Engine Body 12 Turbocharger 13 EGR System 14, 70, 90, 110, 130 Demister Unit 41A EGR Inlet Valve 41B EGR Outlet Valve 42 Scrubber 47 EGR Blower 48 Air Cooler (Cooler)
51 casing 52 demister main body 53, 71, 91, 111, 131 drain pipe (drain induction part)
54, 72 drain discharge pipe 55 water storage tank 61 inlet portion 62 outlet portion 63 demister support plate 67, 143 water storage portion (sealing portion)
68 communicating pipe 81, 121 straight part 82, 122 first bent part (sealing part, water storage part)
83 second bent portion 84, 85 inclined plate 123 partition portion 141 partition plate 142 discharge hole G4, G5, G7 exhaust gas recirculation line G6 intake line W1 drainage circulation line

Claims (13)

  1. 　流体の入口部と出口部が設けられるケーシングと、
    　前記ケーシング内で流体からミストを除去するデミスタ本体と、
    　前記デミスタ本体の下部に連結されて前記デミスタ本体により分離された前記ミストを下方に導くドレン誘導部と、
    　前記ドレン誘導部から前記デミスタ本体への流体の流入を阻止する封止部と、
    　を備えることを特徴とするデミスタユニット。     A casing provided with a fluid inlet and an outlet;
    A demister body for removing mist from fluid in the casing;
    A drain guiding unit connected to a lower portion of the demister main body and guiding the mist separated by the demister main body downward;
    A seal that prevents fluid from flowing from the drain guide to the demister body;
    A demister unit characterized by comprising:
  2. 　前記ドレン誘導部は、基端部が前記デミスタ本体の下部に連結されるドレン管であり、前記封止部は、前記ドレン管内に貯水することで流体の流入を阻止することを特徴とする請求項１に記載のデミスタユニット。 The drain guiding portion is a drain pipe whose base end portion is connected to the lower portion of the demister main body, and the sealing portion is characterized in that the inflow of fluid is prevented by storing water in the drain pipe. The demister unit according to Item 1.
  3. 　前記封止部は、前記ドレン管に設けられる貯水部であることを特徴とする請求項２に記載のデミスタユニット。 The said sealing part is a water storage part provided in the said drain pipe, The demister unit of Claim 2 characterized by the above-mentioned.
  4. 　前記ドレン管は、上端部が前記デミスタ本体の下部に連結される直線部と、前記直線部の下端部に連結されて上方に屈曲する前記貯水部としての屈曲部とを備えることを特徴とする請求項３に記載のデミスタユニット。 The drain pipe has a straight portion whose upper end is connected to the lower portion of the demister main body, and a bent portion which is connected to the lower end of the straight portion and bent upward as the water storage portion. The demister unit according to claim 3.
  5. 　前記ケーシング内のドレンを下方に排出するドレン排出管と、前記ドレン排出管から排出されたドレンを貯留する貯水タンクとが設けられ、前記ドレン管は、前記ドレン排出管に連結されることを特徴とする請求項２から請求項４のいずれか一項に記載のデミスタユニット。 A drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the drain pipe is connected to the drain discharge pipe. The demister unit according to any one of claims 2 to 4, wherein
  6. 　前記ドレン管は、前記封止部が前記ケーシングの外側に配置されることを特徴とする請求項５に記載のデミスタユニット。 The demister unit according to claim 5, wherein the sealing portion of the drain pipe is disposed outside the casing.
  7. 　前記ケーシング内のドレンを下方に排出するドレン排出管と、前記ドレン排出管から排出されたドレンを貯留する貯水タンクとが設けられ、前記ドレン管は、前記ケーシング内に開口されることを特徴とする請求項２から請求項４のいずれか一項に記載のデミスタユニット。 A drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the drain pipe is opened in the casing. The demister unit according to any one of claims 2 to 4.
  8. 　前記封止部は、前記ケーシングに設けられる貯水部であり、前記ドレン管の先端部が前記貯水部に連通されることを特徴とする請求項２に記載のデミスタユニット。 The said sealing part is a water storage part provided in the said casing, and the front-end | tip part of the said drain pipe is connected by the said water storage part, The demister unit of Claim 2 characterized by the above-mentioned.
  9. 　前記ケーシング内のドレンを下方に排出するドレン排出管と、前記ドレン排出管から排出されたドレンを貯留する貯水タンクとが設けられ、前記ドレン排出管の上端部が前記ケーシングの底部より上方に開口することで前記貯水部が設けられることを特徴とする請求項８に記載のデミスタユニット。 A drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the upper end of the drain discharge pipe opens upward from the bottom of the casing 9. The demister unit according to claim 8, wherein the water storage section is provided by doing.
  10. 　前記ケーシング内のドレンを下方に排出するドレン排出管と、前記ドレン排出管から排出されたドレンを貯留する貯水タンクとが設けられ、前記ケーシングの底部に仕切板が固定されることで前記貯水部が設けられることを特徴とする請求項８に記載のデミスタユニット。 A drain discharge pipe for discharging the drain in the casing downward and a water storage tank for storing the drain discharged from the drain discharge pipe are provided, and the water storage portion is fixed by fixing a partition plate to the bottom of the casing. A demister unit according to claim 8, characterized in that
  11. 　前記仕切板は、下端部に排出孔が形成されることを特徴とする請求項１０に記載のデミスタユニット。 The demister unit according to claim 10, wherein a discharge hole is formed at a lower end portion of the partition plate.
  12. 　前記ケーシングにおける前記出口部と前記貯水タンクの上部とを連通する連通管が設けられることを特徴とする請求項５から請求項７と請求項９から請求項１１のいずれか一項に記載のデミスタユニット。 The communication pipe which connects the said outlet part in the said casing and the upper part of the said water storage tank is provided, The demister as described in any one of the Claims 5-7 and the claims 9-11 characterized by the above-mentioned. unit.
  13. 　エンジンから排出された排ガスの一部を燃焼用気体の一部として前記エンジンに再循環する排ガス再循環ラインと、
    　前記排ガス再循環ラインを流れる排ガスに対して水を噴射することで有害物質を除去するスクラバと、
    　前記スクラバから排出された排ガスが導入される請求項１から請求項１２のいずれか一項に記載のデミスタユニットと、
    　を備えることを特徴とするＥＧＲシステム。     An exhaust gas recirculation line for recirculating a part of the exhaust gas discharged from the engine to the engine as a part of the combustion gas;
    A scrubber that removes harmful substances by injecting water to the exhaust gas flowing through the exhaust gas recirculation line;
    The demister unit according to any one of claims 1 to 12, wherein the exhaust gas discharged from the scrubber is introduced.
    An EGR system comprising:
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KR20170120685A (en) 2017-10-31
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