WO2016158570A1 - Ｅｇｒシステム - Google Patents

Ｅｇｒシステム Download PDF

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Publication number
WO2016158570A1
WO2016158570A1 PCT/JP2016/059015 JP2016059015W WO2016158570A1 WO 2016158570 A1 WO2016158570 A1 WO 2016158570A1 JP 2016059015 W JP2016059015 W JP 2016059015W WO 2016158570 A1 WO2016158570 A1 WO 2016158570A1
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WO
WIPO (PCT)
Prior art keywords
purge
exhaust gas
line
egr
gas recirculation
Prior art date
Application number
PCT/JP2016/059015
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English (en)
French (fr)
Japanese (ja)
Inventor
中川　貴裕
平岡　直大
和久 伊藤
哲司 上田
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.)
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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 KR1020177027214A priority Critical patent/KR101999909B1/ko
Priority to CN201680019557.7A priority patent/CN107429638B/zh
Publication of WO2016158570A1 publication Critical patent/WO2016158570A1/ja

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    • 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
    • F02M26/36—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for adding fluids other than exhaust gas to the recirculation passage; with reformers
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the present invention relates to an EGR system that reduces NOx in exhaust gas by returning a part of the exhaust gas discharged from the combustion chamber of an internal combustion engine to the combustion chamber.
  • An exhaust gas recirculation is one that reduces NOx in the exhaust gas.
  • This EGR branches a part of the exhaust gas discharged from the combustion chamber of the internal combustion engine to the exhaust line to the exhaust gas recirculation line, mixes it in the combustion air to make it a combustion gas, and returns it to the combustion chamber. 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 recirculation line is constituted by piping, and at the time of EGR operation, exhaust gas (exhaust gas recirculation gas) flows. Since this exhaust gas contains corrosive components such as NOx and SOx, the corrosive components adhere and remain on the inner surface of the pipe. When this corrosive component is below the acid dew point, it becomes nitric acid or sulfuric acid, which may cause corrosion of the piping. In addition, there exist some which were described in patent document 1, for example as what prevents deterioration of the NOx removal catalyst by sulfuric acid condensation.
  • the exhaust gas denitration equipment for a reciprocating engine described in Patent Document 1 described above prevents deterioration of the denitration catalyst due to sulfuric acid condensation, and does not correspond to the corrosive component contained in the exhaust gas recirculation gas.
  • the present invention solves the above-mentioned problems, and an object of the present invention is to provide an EGR system that prevents pipe corrosion by removing corrosive components remaining in an exhaust gas recirculation line.
  • the EGR system of the present invention comprises an exhaust gas recirculation line for recirculating a part of exhaust gas discharged from an engine to the engine as a part of combustion gas, and the exhaust gas recirculation line It is characterized by comprising an EGR inlet valve provided, and a purge device for supplying a purge gas to the exhaust gas recirculation line to discharge the remaining corrosive components.
  • the purge device includes a purge gas supply line for supplying a purge gas to the exhaust gas recirculation line, and a purge gas discharge line for discharging a corrosive component remaining with the purge gas.
  • the purge gas is supplied from the purge gas supply line to the exhaust gas recirculation line, the purge gas and the corrosive component are discharged from the purge gas discharge line, and the supply of the purge gas and the discharge of the purge gas and the corrosive component can be properly performed.
  • the exhaust gas recirculation line further includes a scrubber provided downstream of the EGR inlet valve in the exhaust gas recirculation line, and the purge gas supply line is between the EGR inlet valve and the scrubber in the exhaust gas recirculation line.
  • a purge valve may be provided to open and close the purge gas supply line.
  • the purge gas is supplied from the purge gas supply line between the EGR inlet valve and the scrubber in the exhaust gas recirculation line, and the exhaust gas recirculation including the scrubber Corrosive components remaining in the line can be removed, and corrosive components remaining in the exhaust gas recirculation line can be properly removed.
  • the EGR system according to the present invention is characterized in that when the EGR operation stop signal is input, the EGR inlet valve is closed to open the purge valve for a predetermined period.
  • the EGR inlet valve is closed and the purge valve is opened for a predetermined period. Therefore, when the EGR operation is stopped, the purge gas is supplied from the purge gas supply line to the exhaust gas recirculation line. Thus, the corrosive components remaining in the exhaust gas recirculation line can be removed earlier.
  • the purge gas discharge line is provided with a first purge gas discharge line for discharging the purge gas from the purge gas supply line from the exhaust gas recirculation line to the engine.
  • the purge gas from which the harmful substance remaining in the exhaust gas recirculation line has been removed is discharged from the first purge gas exhaust line to the engine, the harmful substance can be processed by the engine and the exhaust gas from the engine can be processed. It can suppress the release to the outside.
  • the purge gas discharge line is provided with a second purge gas discharge line for discharging the purge gas from the purge gas supply line to the exhaust line, and an exhaust valve for opening and closing the second purge gas discharge line. It is characterized by
  • the purge gas supplied from the purge gas supply line to the exhaust gas recirculation line is discharged from the second purge gas discharge line to the exhaust line, and even if the operation of the engine is stopped, The purge gas from which harmful substances remaining in the exhaust gas recirculation line have been removed can be properly processed.
  • the EGR system according to the present invention is characterized in that when the EGR operation is stopped, the exhaust valve is opened for a predetermined period.
  • the exhaust valve is opened for a predetermined period, so the EGR operation is stopped and the purge gas of the exhaust gas recirculation line is exhausted from the purge gas discharge line even if the engine operation is stopped. It can be fed to the line, and the purge gas from which the corrosive components remaining in the exhaust gas recirculation line have been removed can be properly processed.
  • the purge device is characterized in that outside air is supplied to the exhaust gas recirculation line as a purge gas.
  • the purge process can be performed with high accuracy without leaving the harmful substances in the exhaust gas recirculation line.
  • the piping system can be simplified.
  • the purge device is characterized in that a part of scavenging air supplied to the engine is supplied to the exhaust gas recirculation line as a purge gas.
  • the purge device is characterized in that compressed air is supplied as a purge gas to the exhaust gas recirculation line.
  • the exhaust gas recirculation line can be properly purged since the compressed air is supplied to the exhaust gas recirculation line to discharge the remaining harmful substances.
  • a scrubber is provided downstream of the EGR inlet valve in the exhaust gas recirculation line, and the purge gas supply line is connected downstream of the scrubber in the exhaust gas recirculation line, and the purge gas
  • a purge valve for opening and closing a supply line, and a blower for supplying a purge gas from the purge gas supply line in the reverse direction of the exhaust gas recirculation line are provided.
  • the purge valve is opened and the blower is operated in the reverse rotation direction, whereby the purge gas is supplied from the purge gas supply line to the downstream side of the exhaust gas recirculation line downstream of the scrubber. It is possible to remove the harmful substances remaining in the exhaust gas recirculation line including the above, and to properly remove the corrosive components remaining in the exhaust gas recirculation line.
  • the purge gas supply line discharges the purge gas from the purge gas supply line from the exhaust gas recirculation line to an exhaust line.
  • the harmful substance can be treated by the exhaust system of the engine, and emission to the outside can be suppressed.
  • the EGR outlet valve provided downstream of the connection portion of the purge gas supply line in the exhaust gas recirculation line, and the EGR outlet valve closed when the EGR operation is stopped to set the purge valve It is characterized by opening only for a period.
  • the EGR outlet valve is closed and the purge valve is opened for a predetermined period. Therefore, when the EGR operation is stopped, the purge gas is supplied from the purge gas supply line to the exhaust gas recirculation line. It is possible to remove harmful substances remaining in the exhaust gas recirculation line.
  • the purge device for supplying the purge gas to the exhaust gas recirculation line to discharge the remaining harmful substances since the purge device for supplying the purge gas to the exhaust gas recirculation line to discharge the remaining harmful substances is provided, it is possible to prevent the corrosion of the piping that constitutes the exhaust gas recirculation line.
  • FIG. 1 is a schematic configuration view showing an EGR system of the first embodiment.
  • FIG. 2 is a flow chart showing purge control when the EGR operation is stopped in the EGR system of the first embodiment.
  • FIG. 3 is a flow chart showing the operation of the EGR system at the time of entry of the ship of the first embodiment.
  • FIG. 4 is a flow chart showing the operation of the EGR system at the time of departure of the ship of the first embodiment.
  • FIG. 5 is a graph showing the SO 2 concentration of the exhaust gas recirculation line against the purge time.
  • FIG. 6 is a graph showing details of the SO 2 concentration in the exhaust gas recirculation line with respect to the purge time.
  • FIG. 7 is a schematic block diagram showing the EGR system of the second embodiment.
  • FIG. 1 is a schematic configuration view showing an EGR system of the first embodiment.
  • FIG. 2 is a flow chart showing purge control when the EGR operation is stopped in the EGR system of the first embodiment.
  • FIG. 3 is
  • FIG. 8 is a flowchart showing purge control at the time of engine operation stop in the EGR system of the second embodiment.
  • FIG. 9 is a flow chart showing the operation of the EGR system at the time of entry of the ship of the second embodiment.
  • FIG. 10 is a schematic configuration diagram showing an EGR system of the third embodiment.
  • FIG. 11 is a schematic configuration diagram showing an EGR system of a fourth embodiment.
  • FIG. 12 is a flowchart showing purge control at the time of EGR operation stop in the EGR system of the fourth embodiment.
  • FIG. 13 is a schematic configuration diagram showing an EGR system of a fifth embodiment.
  • FIG. 1 is a schematic configuration view showing an EGR system of the first embodiment.
  • the marine diesel engine 10 includes an engine body 11, a supercharger 12, an air cooler 52, 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 has 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 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.
  • Gas air and / or recycle gas
  • the compressor 31 is further provided with a suction line G6 for sucking air from the outside, and an exhaust gas recirculation line G7 to which exhaust gas is sent by the EGR blower 50.
  • a suction line G6 for sucking air from the outside
  • an exhaust gas recirculation line G7 to which exhaust gas is sent by the EGR blower 50.
  • the exhaust gas (recirculation gas) from the recirculation line G7 is mixed by a mixer (not shown) to generate a combustion gas.
  • the mixer does not necessarily have to be a device having only the function of mixing the exhaust gas with the air, and a silencer (not shown) attached to the compressor may be provided with the above-described function as a mixer. .
  • the turbine 32 is connected to an exhaust line G3 for discharging the exhaust gas generated by rotating the turbine 32, and the exhaust line G3 is connected to a chimney (funnel) via an exhaust gas processing device (not shown).
  • the air cooler (cooler) 52 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 EGR system 13 includes exhaust gas recirculation lines G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower (blower) 50, a purge device, and a control device 60.
  • the EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
  • the EGR system 13 is provided to bypass from the exhaust line G3 to the air supply line G1.
  • the exhaust gas recirculation line G4 is provided with an EGR inlet valve (opening / closing valve) 41.
  • the EGR inlet valve 41 opens / closes the exhaust gas branched from the exhaust line G3 to the exhaust gas recirculation line G4 by opening and closing the exhaust gas recirculation line G4.
  • the EGR inlet valve 41 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 removes harmful substances such as particulates (PM) such as SOx and dust contained therein by injecting water to the exhaust gas.
  • the scrubber 42 includes a hollow throat 43, a venturi 44 into which exhaust gas is introduced, and an enlargement 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 the exhaust gas from which harmful substances have been removed and the waste water.
  • the Venturi type is adopted in the present embodiment, the present invention is not limited to this configuration.
  • the exhaust gas recirculation line (second line) G ⁇ b> 5 has one end connected to the scrubber 42 and the other end connected to the EGR blower (blower) 50.
  • a demister unit 49 is disposed in the path of the exhaust gas recirculation line G5.
  • the demister unit 49 separates the waste gas and the waste gas from which harmful substances have been removed by water injection.
  • the demister unit 49 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 48 for temporarily storing drainage and a pump 50.
  • the EGR blower 50 guides the exhaust gas in the scrubber 42 from the exhaust gas recirculation line G5 to the demister unit 49, and is driven by an electric motor.
  • the exhaust gas recirculation line (third line) G7 has one end connected to the EGR blower 50 and the other end connected to the compressor 31 via a mixer (not shown). Exhaust gas is sent to the compressor 31 by the EGR blower 50. Further, the exhaust gas recirculation line G7 is provided with an EGR outlet valve (on-off valve or flow control valve) 51.
  • the purge apparatus of the present embodiment includes a purge gas supply line G11 and a purge valve 61.
  • the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1 function as a first purge gas discharge line.
  • the purge device supplies the purge gas from the purge gas supply line G11, and discharges the purge gas together with the corrosive components from the exhaust gas recirculation line G7.
  • the exhaust gas recirculation lines G4, G5, G7 are connected to the engine body 11 via the air supply line G1.
  • One end of the purge gas supply line G11 is open to the atmosphere, and the other end is in communication with the middle of the exhaust gas recirculation line G4. More specifically, the other end of the purge gas supply line G11 is connected to the middle of the exhaust gas recirculation line G4 between the EGR inlet valve 41 and the scrubber 42.
  • a compressed air supply source may be connected to one end of the purge gas supply line G11.
  • the compressed air supply source includes, for example, a compressor and a pressure accumulation tank, and the compressed air generated by the compressor is stored in the pressure accumulation tank, and the compressed air is supplied to various devices used in the ship. Can be supplied.
  • the purge gas can be supplied to the exhaust gas recirculation lines G4, G5, G7 without driving the EGR blower 50.
  • the purge valve 61 can open and close the purge gas supply line G11. Therefore, closing the EGR inlet valve 41 and opening the purge valve 61 sucks outside air (air) as purge gas from one end of the purge gas supply line G11 and supplies it to the exhaust gas recirculation line G4 through the purge gas supply line G11. Can.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, and the purge valve 61 in accordance with the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, and the purge valve 61 in accordance with the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50. That is, the control device 60 does not receive the EGR operation start signal S1 if the current operation area of the ship is outside the ECA (NOx control area) that regulates the emission of NOx, and the EGR inlet valve 41 and the EGR outlet valve 51, the purge valve 61 is closed and the driving of the EGR blower 50 is stopped. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3.
  • ECA NOx control area
  • the control device 60 receives the EGR operation start signal S1 and the EGR inlet valve 41 and the EGR outlet valve 51 As well as driving the EGR blower 50. Then, a part of the exhaust gas discharged from the engine body 11 is supplied from the exhaust line G3 to the exhaust gas recirculation lines G4, G5, G7.
  • the control device 60 receives the EGR operation stop signal S2 and reduces the rotational speed of the EGR blower 50. Thereafter, the EGR inlet valve 41 is closed and the purge valve 61 is opened. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, the air supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is supplied to the scavenging trunk 22 of the engine body 11 through the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1.
  • the combustion air is supplied from the scavenging air trunk 22 into the cylinder 21 from the scavenging air trunk 22, the combustion air is compressed by the piston, and the fuel is injected to the high-temperature air to cause natural ignition. To burn. 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. When the EGR inlet valve 41 is closed, the entire amount is discharged to the outside from the exhaust line G3. Be done.
  • a scrubber 42 removes harmful substances from the exhaust gas that has flowed into the exhaust gas recirculation line G4. 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.
  • 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 exhaust gas and the drainage are separated by the demister unit 49, the turbocharger 12 is connected via the EGR blower 50 and the exhaust gas recirculation line G7. Sent to Then, this exhaust gas is mixed with the air taken in from the suction line G6 to become a combustion gas, compressed by the compressor 31 of the turbocharger 12, and then cooled by the air cooler 52, and from the air supply line G1 to the engine main body 11 Supplied to
  • FIG. 2 is a flow chart showing the purge control at the time of EGR operation stop in the EGR system
  • FIG. 3 is a flow chart showing the operation of the EGR system at the time of entry of the ship
  • FIG. 4 shows the action of the EGR system at the departure of the ship flowchart
  • Fig. 5 is a graph representing the SO 2 concentration in the exhaust gas recirculation line for the purge time
  • FIG. 6 is a graph showing the details of the SO 2 concentration in the exhaust gas recirculation line for purge time.
  • step S11 when the EGR operation stop signal S2 is input in step S11, the control device 60 starts the EGR operation stop sequence, and step S12 Then, the rotational speed of the EGR blower 50 is decreased, and in step S13, it is determined whether the rotational speed of the EGR blower 50 has become equal to or less than a preset rotational speed.
  • the process waits until the rotational speed of the EGR blower 50 becomes equal to or less than the set rotational speed, and when the rotational speed of the EGR blower 50 becomes equal to or less than the set rotational speed, the process proceeds to step S16.
  • step S14 the closing operation of the EGR inlet valve 41 is started, and in step S15, it is determined whether the opening degree of the EGR inlet valve 41 has become equal to or less than a preset opening degree.
  • the process waits until the degree of opening of the EGR inlet valve 41 becomes less than the set degree of opening, and maintains the degree of opening of the EGR inlet valve 41 in a slightly open state when the degree of opening of the EGR inlet valve 41 becomes less than the set degree of opening. Then, the process proceeds to step S16.
  • step S16 the control device 60 starts the opening operation of the purge valve 61, and in step S17, determines whether the opening degree of the purge valve 61 is fully opened.
  • the operation waits until the opening degree of the purge valve 61 is fully opened, and when the opening degree of the purge valve 61 is fully opened, the closing operation of the EGR inlet valve 41 is resumed in step S18, and the EGR inlet in step S19. It is determined whether or not the opening degree of the valve 41 has become equal to or less than a preset opening degree (almost fully closed).
  • the process waits until the opening degree of the EGR inlet valve 41 is fully closed, and when the opening degree of the EGR inlet valve 41 is fully closed, the purge process of the exhaust gas recirculation line G4 is preset in step S20. Run for the specified time.
  • the exhaust gas recirculation lines G4, G5, G7, the compressor 31, and the air supply line G1 communicate with the scavenge air trunk 22 of the engine body 11. Further, since the EGR blower 50 is provided in the middle of the exhaust gas recirculation lines G4, G5, G7, the gas flow to the scavenging trunk 22 side acts by driving the EGR blower 50. Therefore, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are removed by the air, and the purge gas containing the corrosive components is sent to the scavenging trunk 22.
  • the control device 60 determines whether or not a specified time has elapsed since it was determined in step S21 that the degree of opening of the EGR inlet valve 41 is fully closed.
  • the purge process of the exhaust gas recirculation lines G4, G5, G7 is executed until the specified time has elapsed.
  • the purge processing time of the exhaust gas recirculation lines G4, G5, G7 is set in advance.
  • the volume (volume) of the equipment or piping that executes the purge process is Vm 3
  • the amount of air taken into the purge gas supply line G11 per unit time is V p m 3 / min
  • the concentration of corrosive components in the purge region is X 0 ppm
  • the purge time when is T it is possible to determine the average density X t of the purge region after T minutes by the following equation.
  • X t + 1 ⁇ (X t V)-(X t V p ) ⁇ / V
  • FIG. 5 is a partial enlarged view of FIG.
  • FIG. 5 when the purge time is 5 minutes, the concentration of corrosive components in the exhaust gas recirculation lines G4, G5, G7 decreases to the specified value, and as shown in FIG. The concentration of corrosive components in the exhaust gas recirculation lines G4, G5 and G7 is reduced to almost 0 ppm.
  • step S21 when it is determined in step S21 that the opening degree of the EGR inlet valve 41 is fully closed and the specified time has elapsed, the operation of the EGR blower 50 is stopped in step S22. Subsequently, in step S23, the purge valve 61 is closed, and in step S24, the EGR outlet valve 51 is closed. In step S25, the purge process of the exhaust gas recirculation lines G4, G5, G7 is completed.
  • the stage before entering the port for example, the stage of switching the engine operation mode from the out-of-port navigation mode to the in-port navigation mode (Full Ahead: full forward speed at harbor speed)). Stop the EGR operation. After the EGR operation is stopped, the above-described purge control at the time of the EGR operation stop is executed.
  • the EGR system according to the first embodiment stops the EGR operation in the ECA before entering the port. Therefore, only by providing the purge gas supply line G11 and the purge valve 61 as a purge device, The corrosive components can be discharged from the exhaust gas recirculation lines G4, G5, G 7. On the other hand, at the time of leaving the port, the EGR operation is stopped outside the ECA and purging is performed as shown in FIG.
  • the exhaust gas recirculation lines G4, G5, G7 recirculate a part of the exhaust gas discharged from the engine body 11 to the engine body 11 as a part of the combustion gas.
  • an EGR inlet valve 41 provided in the exhaust gas recirculation line G4, and a purge gas supply line G11 as a purge device for supplying the purge gas to the exhaust gas recirculation lines G4, G5, G7 and discharging remaining corrosive components.
  • the purge device supplies the purge gas from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7
  • the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are discharged together with the purge gas. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7 can be suppressed.
  • a purge gas supply line G11 and a purge valve 61 are provided as a purge device.
  • the exhaust gas recirculation lines G4, G5, G7 function as purge gas discharge lines.
  • the purge gas can be supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4, and the corrosive components can be discharged together with the purge gas from the exhaust gas recirculation lines G4, G5, G7. That is, the supply of the purge gas and the discharge of the corrosive component can be properly performed.
  • the purge device supplies outside air (air) as a purge gas from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7. Therefore, since air is supplied to the exhaust gas recirculation lines G4, G5, G7 to discharge the remaining corrosive components, it is possible to purge without leaving any corrosive components in the exhaust gas recirculation lines G4, G5, G7.
  • the exhaust gas recirculation lines G4, G5, and G7 may be connected to the purge gas supply line G11 whose one end is open to the atmosphere, and the piping system of the purge device can be simplified.
  • a purge device there are a purge gas supply line G11 connected between the EGR inlet valve 41 and the scrubber 42 in the exhaust gas recirculation line G4, and a purge valve 61 for opening and closing the purge gas supply line G11. It is provided.
  • the purge gas is supplied from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7 by opening the purge valve 61, and the scrubber 42, the demister unit 49 and Corrosion components remaining in the exhaust gas recirculation lines G4, G5, G7 including the EGR blower 50 can be removed, and corrosion components remaining in the exhaust gas recirculation lines G4, G5, G7 can be properly removed.
  • the purge device supplies the purge gas from the purge gas supply line G11 to the engine body 11 from the exhaust gas recirculation lines G4, G5, G7. Therefore, while being able to process a corrosive component with engine main part 11, by processing exhaust gas from engine main part 11, discharge to the exterior can be controlled.
  • the EGR system according to the first embodiment is provided with a control device 60 that closes the EGR inlet valve 41 and opens the purge valve 61 for a predetermined period when the EGR operation stop signal S2 is input. Therefore, when the EGR operation is stopped, the purge gas is supplied from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7, and corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 at an early stage by the purge gas are It can be removed.
  • the purge valve 61 is opened for a predetermined period, and then the engine operation is stopped. Accordingly, the purge gas is supplied from the purge gas supply line G11 to the exhaust gas recirculation lines G4, G5, G7 before the EGR operation is stopped and the operation of the engine main body 11 is stopped. , G5, and G7 can be removed.
  • FIG. 7 is a schematic block diagram showing the EGR system of the second 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 purge apparatus includes a purge gas supply line G11, a purge valve 61, a purge gas discharge line G12, and an exhaust valve 62.
  • the exhaust gas recirculation line G7 functions as a first purge gas discharge line
  • the purge gas discharge line G12 functions as a second purge gas discharge line.
  • the purge device supplies a purge gas from a purge gas supply line G11, and discharges a purge gas and a corrosive component from an exhaust gas recirculation line G7 or a purge gas discharge line G12.
  • One end of the purge gas discharge line G12 is connected to the middle of the exhaust gas recirculation line G7, and the other end is connected to the middle of the exhaust line G3. More specifically, one end of the purge gas discharge line G12 is connected to the middle of the exhaust gas recirculation line G7 between the outlet of the EGR blower 50 and the EGR outlet valve (flow control valve) 51, and the other end is It is connected between the outlet of the turbine 32 and the connection between the exhaust line G3 and the exhaust gas recirculation line G4.
  • the exhaust valve 62 can open and close the purge gas discharge line G12. Therefore, when the EGR outlet valve (flow control valve) 51 is closed and the exhaust valve 62 is opened, the gas flowing inside the EGR system 13 is exhausted to the exhaust line G3 through the purge gas exhaust line G12.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, the purge valve 61, and the exhaust valve 62 according to the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, the purge valve 61, and the exhaust valve 62 according to the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50. That is, the control device 60 does not receive the EGR operation start signal S1 if the current operation area of the ship is outside the ECA that regulates the emission amount of NOx, and the EGR inlet valve 41, the EGR outlet valve 51, the purge valve 61, The exhaust valve 62 is closed and the driving of the EGR blower 50 is stopped. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3.
  • the control device 60 receives the EGR operation start signal S1 and opens the EGR inlet valve 41 and the EGR outlet valve 51.
  • the EGR blower 50 is driven. Then, a part of the exhaust gas discharged from the engine body 11 is supplied from the exhaust line G3 to the exhaust gas recirculation lines G4, G5, G7.
  • the control device 60 receives the EGR operation stop signal S2 and reduces the rotational speed of the EGR blower 50. Thereafter, the EGR inlet valve 41 is closed and the purge valve 61 is opened. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, the air supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is supplied to the scavenging trunk 22 of the engine body 11 through the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1.
  • the control device 60 receives the engine operation stop signal S3, closes the EGR outlet valve 51, and opens the exhaust valve 62. Then, the air supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is discharged from the exhaust gas recirculation line G4 to the outside through the gas discharge line G5, the exhaust gas supply line G7, the purge gas discharge line G12, and the exhaust line G3. .
  • the EGR system according to the second embodiment can remove the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 even after the operation of the engine body 11 is stopped. It is different from
  • FIG. 8 is a flow chart showing purge control at the time of engine operation stop in the EGR system
  • FIG. 9 is a flow chart showing the operation of the EGR system at the time of entry of a ship.
  • step S31 the control device 60 is executing purge processing of the exhaust gas recirculation lines G4, G5, G7 or before execution of the purge processing.
  • the engine operation stop signal (purge process start signal) S3 is input, the purge sequence is started, and in step S32, the opening operation of the purge valve 61 is started, and in step S33, the opening degree of the purge valve 61 is Determine if it is fully open.
  • the process waits until the opening degree of the purge valve 61 is fully opened, and when the opening degree of the purge valve 61 is fully opened, the process proceeds to step S34.
  • steps S32 and S33 if the purge process of the exhaust gas recirculation lines G4, G5, and G7 is being performed, the opening degree of the purge valve 61 is already fully open, and the process directly proceeds to step S34.
  • step S34 the control device 60 starts the opening operation of the exhaust valve 62, and determines in step S35 whether or not the opening degree of the exhaust valve 62 is fully open.
  • the process waits until the opening degree of the exhaust valve 62 is fully opened, and when the opening degree of the exhaust valve 62 is fully opened, the number of rotations of the EGR blower 50 is reduced to a preset number of rotations in step S36. .
  • step S37 the purge process of the exhaust gas recirculation lines G4, G5, and G7 is performed for a predetermined time set in advance.
  • the exhaust gas recirculation lines G4, G5 and G7 generate a gas flow to the exhaust line G3 side, and are taken from the purge gas supply line G11.
  • the exhausted air is exhausted to the outside through the exhaust gas recirculation lines G4, G5, G7, the purge gas exhaust line G12, and the exhaust line G3.
  • the control device 60 determines whether or not a specified time has elapsed since the number of revolutions of the EGR blower 50 has been reduced.
  • the purge processing of the exhaust gas recirculation lines G4, G5, G7 is performed until the specified time has elapsed, and when the specified time has elapsed, the operation of the EGR blower 50 is stopped in step S39, and in step S40.
  • the purge valve 61 is closed, the exhaust valve 62 is closed in step S41, and the purge process of the exhaust gas recirculation lines G4, G5, G7 is completed in step S42.
  • the purge process of the exhaust gas recirculation lines G4, G5, G7 when the operation of the engine main body 11 is stopped during the purge process of the exhaust gas recirculation lines G4, G5, G7 has been described. It is not necessary to purge the lines G4, G5 and G7.
  • the control device 60 may execute the above-described processing upon receiving a purge processing start signal by the occupant turning on the purge processing switch. .
  • the purge device can select discharge of the purge gas according to the operation state of the ship. That is, as shown in FIG. 9, when the operation of the engine and the EGR is stopped in the ECA at the time of entry of the ship, the exhaust line together with the remaining corrosive components of the air supplied to the exhaust gas recirculation line G4. Discharge to G3. On the other hand, at the time of departure of the ship, as in FIG. 4, if the operation of the EGR is stopped without stopping the operation of the engine outside the ECA, the purge gas supplied to the exhaust gas recirculation line G4 remains. It discharges to scavenging air trunk 22 (engine) with an ingredient.
  • a purge gas supply line G11, a purge valve 61, a purge gas discharge line G12, and an exhaust valve 62 are provided as a purge device.
  • the exhaust gas recirculation line G7 functions as a first purge gas discharge line
  • the purge gas discharge line G12 functions as a second purge gas discharge line.
  • the purge gas can be supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4, and the corrosive components can be discharged together with the purge gas from the exhaust gas recirculation line G7 or the purge gas discharge line G12. That is, the supply of the purge gas and the discharge of the purge gas and the corrosive component can be properly performed.
  • the purge device is provided with a purge gas discharge line G12 for supplying the purge gas from the purge gas supply line G11 to the exhaust line G3, and an exhaust valve 62 for opening and closing the purge gas supply line G12. Therefore, by opening the exhaust valve 62, the purge gas supplied from the purge gas supply line G11 to the exhaust gas recirculation line G4 is supplied from the purge gas discharge line G12 to the exhaust line G3 without passing through the engine main body 11. Even if the operation of the engine body 11 is stopped, the purge gas from which the corrosive components remaining in the exhaust gas recirculation line G have been removed can be properly processed.
  • the control device 60 opens the purge valve 61 and the exhaust valve 62 for a predetermined period when the engine operation stop signal (purge process start signal) is input. Therefore, even if the EGR operation is stopped and the operation of the engine main body 11 is stopped, the purge gas of the exhaust gas recirculation line G4 can be supplied from the purge gas discharge line G12 to the exhaust line G3, and the exhaust gas recirculation line G4, The purge gas from which the corrosive components remaining in G5 and G7 have been removed can be properly processed.
  • FIG. 10 is a schematic configuration diagram showing an EGR system of the third 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 EGR system 13 includes an exhaust gas recirculation line G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower 50, a purge device, and a control device. It has 60.
  • the EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
  • the purge device includes a purge gas supply line G13, a purge valve 61, a purge gas discharge line G12, and an exhaust valve 62.
  • the purge device supplies a purge gas from the purge gas supply line G13, and discharges a corrosive component together with the purge gas from the exhaust gas recirculation line G7 or the purge gas discharge line G12.
  • one end of the purge gas supply line G13 is connected between the scavenging air trunk and the air cooler 52 in the air supply line G1, and the other end is between the EGR inlet valve 41 and the scrubber 42 in the exhaust gas recirculation line G4.
  • Is linked to The purge gas supply line G13 is provided with a purge valve 61, and the purge gas supply line G13 can be opened and closed.
  • the EGR inlet valve 41 is closed and the purge valve 61 is opened, a part of scavenging gas (combustion gas) in the air supply line G1 is sucked as purge gas from one end of the purge gas supply line G13 and passes through the purge gas supply line G13.
  • the exhaust gas recirculation line G4 can be supplied.
  • the air supplied from the purge gas supply line G13 to the exhaust gas recirculation line G4 is supplied to the scavenging trunk 22 of the engine body 11 through the exhaust gas recirculation lines G4, G5, G7 and the air supply line G1.
  • the control device 60 reduces the rotational speed of the EGR blower 50 when the EGR operation stop signal S2 is input. Thereafter, the EGR inlet valve 41 is closed and the purge valve 61 is opened. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, part of the scavenging air in the air supply line G1 is supplied to the purge gas supply line G13, and the air supplied from the purge gas supply line G13 to the exhaust gas recirculation line G4 is an exhaust gas recirculation line G4, G5, G7, the air supply It is supplied to the scavenging air trunk 22 of the engine body 11 through the line G1. Therefore, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are removed by the purge gas, and the purge gas containing the corrosive components is sent to the scavenging trunk 22.
  • the purge gas is supplied to the exhaust gas recirculation lines G4, G5, G7 from between the exhaust gas recirculation line G4, the EGR inlet valve 41, and the scrubber 42 to remain.
  • the purge device is provided with a purge gas supply line G13 as a purge device for discharging the corrosive components, and the purge device supplies a part of the scavenging gas supplied to the engine main body 11 to the exhaust gas recirculation lines G4, G5, G7 as a purge gas.
  • the purge device supplies part of the scavenging gas as the purge gas from the purge gas supply line G13 to the exhaust gas recirculation lines G4, G5, G7
  • the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are exhausted together with the scavenging Ru. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, it is possible to prevent the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7.
  • FIG. 11 is a schematic block diagram showing the EGR system of the fourth embodiment
  • FIG. 12 is a flowchart showing purge control at the time of EGR operation stop in the EGR system.
  • 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 EGR system 13 includes exhaust gas recirculation lines G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower 50, a purge device, and a control device. It has 60.
  • the EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
  • the purge device includes a purge gas supply line G15 and a purge valve 71.
  • the exhaust gas recirculation line G4 functions as a purge gas discharge line.
  • the purge device supplies a purge gas from the purge gas supply line G15 to the exhaust gas recirculation line G7, and discharges the purge gas and the corrosive component from the exhaust line G3.
  • the purge gas supply line G15 has one end opened to the atmosphere and the other end connected to the downstream side of the exhaust gas recirculation line G4 between the EGR blower 50 and the EGR outlet valve 51 in the exhaust gas recirculation line G7. It is connected.
  • the purge gas supply line G15 is provided with a purge valve 71, and the purge gas supply line G15 can be opened and closed. Therefore, closing the EGR outlet valve 51 and opening the purge valve 71 sucks outside air (air) as purge gas from one end of the purge gas supply line G15 and supplies it to the exhaust gas recirculation line G7 through the purge gas supply line G15.
  • a compressed air supply source may be connected to one end of the purge gas supply line G15.
  • the compressed air supply source 63 includes, for example, a compressor and a pressure accumulation tank, and the compressed air generated by the compressor is stored in the pressure accumulation tank, and the compressed air is supplied to various devices used in the ship. Can be supplied. In this case, the purge gas can be supplied without driving the EGR blower 50.
  • the EGR blower 50 Since the EGR blower 50 is provided in the path of the exhaust gas recirculation lines G4, G5, G7, the gas flow from the exhaust gas supply line G7 to the exhaust line G3 side is operated by driving the EGR blower 50 in reverse. It can be done. Therefore, by driving the EGR blower 50 in reverse, the air supplied from the purge gas supply line G15 to the exhaust gas supply line G7 is supplied from the exhaust gas supply line G7 to the exhaust line G3.
  • the control device 60 can control the opening and closing of the EGR inlet valve 41, the EGR outlet valve 51, and the purge valve 71 in accordance with the operation state (operating sea area) of the ship, and can control the driving of the EGR blower 50. That is, the control device 60 receives the EGR operation start signal S1 and opens the EGR inlet valve 41 and the EGR outlet valve 51 if the current operation area of the ship is in the NOx control area where emission of NOx is restricted. At the same time, the EGR blower 50 is driven to rotate normally. Then, a part of the exhaust gas discharged from the engine body 11 is supplied from the exhaust line G3 to the exhaust gas recirculation line G4.
  • the control device 60 receives the EGR operation stop signal S2 when the current operation area of the ship moves from inside the ECA to outside the ECA, closes the EGR outlet valve 51, opens the purge valve 71, and the EGR blower 50. Drive in reverse. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, the air supplied from the purge gas supply line G15 to the exhaust gas recirculation line G7 is supplied to the exhaust line G3.
  • step S51 when the EGR operation stop signal S2 is input in step S51, the control device 60 starts the EGR operation stop sequence, and step S52 Then, the rotation of the EGR blower 50 is stopped, and in step S53, it is determined whether the rotation of the EGR blower 50 has stopped.
  • the process waits until the rotation of the EGR blower 50 stops, and when the rotation of the EGR blower 50 stops, the process proceeds to step S56.
  • step S54 the closing operation of the EGR outlet valve 51 is started, and in step S55, it is determined whether the opening degree of the EGR outlet valve 51 has become equal to or less than a preset opening degree.
  • the process waits until the opening degree of the EGR outlet valve 51 becomes equal to or less than the set opening degree, and when the opening degree of the EGR outlet valve 51 is fully closed, the process proceeds to step S56.
  • step S56 the controller 60 starts the opening operation of the purge valve 71, and in step S57 determines whether the opening degree of the purge valve 71 is fully opened.
  • the process waits until the opening degree of the purge valve 71 is fully opened, and when the opening degree of the purge valve 71 is fully opened, reverse driving of the EGR blower 50 is started in step S58, exhaust gas recirculation in step S59.
  • the purge process of the line G4 is executed for a predetermined time set in advance. That is, since the EGR blower 50 is reversely driven, the exhaust gas recirculation line G4 has a gas flow toward the exhaust line G3, and the air taken in from the purge gas supply line G15 is the exhaust gas recirculation line.
  • the control device 60 determines whether or not a specified time has elapsed since the EGR blower 50 started reverse driving.
  • the purge process of the exhaust gas recirculation lines G4, G5, G7 is executed until the specified time has elapsed.
  • the operation of the EGR blower 50 is stopped in step S61, the purge valve 71 is closed in step S62, the EGR inlet valve 41 is closed in step S63, and the process is performed in step S64.
  • the purge process of the exhaust gas recirculation lines G4, G5 and G7 is completed.
  • the corrosive components remaining in the exhaust gas recirculation lines G4, G5 and G7 are discharged to the exhaust line G3 by the purge gas, even if the operation of the engine main body 11 is stopped, the procedure described above is performed.
  • the corrosion components remaining in the exhaust gas recirculation lines G4, G5 and G7 can be purged.
  • exhaust gas recirculation lines G4, G5, G7 recirculate a part of the exhaust gas discharged from the engine main body 11 to the engine main body 11 as a part of the combustion gas.
  • a purge gas supply line G15 is provided as a purge device that supplies purge gas to G4, G5, and G7 and discharges the remaining corrosive components.
  • the purge device supplies the purge gas from the purge gas supply line G15 to the exhaust gas recirculation line G7, and the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are together with the purge gas. Exhausted. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, it is possible to prevent the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7.
  • a purge gas supply line G15 connected to the downstream side of the exhaust gas recirculation line G7 downstream of the EGR blower 50 (between the EGR blower 50 and the EGR outlet valve 51), and a purge gas supply
  • a purge valve 71 for opening and closing the line G15 and an EGR blower 50 for feeding the purge gas from the purge gas supply line G15 in the reverse direction to the exhaust gas recirculation lines G4, G5 and G7 are provided.
  • the purge valve 71 is opened and the EGR blower 50 is reversely driven, whereby the purge gas is discharged from the purge gas supply line G15 through the exhaust gas recirculation lines G4, G5, G7 to the exhaust line G3.
  • the corrosive components remaining in the exhaust gas recirculation line G4 including the scrubber 42, the demister unit 49, and the EGR blower 50 can be removed, and the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7. Can be properly removed.
  • the EGR system of the fourth embodiment is provided with a control device 60 which closes the EGR outlet valve 51 and opens the purge valve 71 for a predetermined period when the EGR operation stop signal S2 is input. Therefore, the control device 60 closes the EGR outlet valve 51 and opens the purge valve 71 for a predetermined period when the EGR operation stop signal S2 is input. Therefore, when the EGR operation is stopped, the purge gas is recirculated from the purge gas supply line G15. The gas is supplied to the line G4, and the corrosive components remaining in the exhaust gas recirculation line G4 can be removed early by the purge gas.
  • FIG. 13 is a schematic configuration diagram showing an EGR system of a fifth 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 EGR system 13 includes an exhaust gas recirculation line G4, G5, G7, a scrubber 42, a demister unit 49, an EGR blower 50, a purge device, and a control device. It has 60.
  • the EGR system 13 mixes a part of the exhaust gas discharged from the engine body 11 with air, and then compresses it by the turbocharger 12 and recycles it to the engine body 11 as a combustion gas, from this recirculated exhaust gas It removes harmful substances.
  • the purge device includes a purge gas supply line G16, a purge valve 71, and an exhaust line G3.
  • the purge device supplies the purge gas from the purge gas supply line G16 to the exhaust gas recirculation line G7, and discharges the purge gas and the corrosive component from the exhaust line G3.
  • one end of the purge gas supply line G16 is connected between the scavenging air trunk and the air cooler 52 in the air supply line G1, and the other end is the EGR blower 50 and the EGR outlet valve 51 in the exhaust gas recirculation line G7. It is connected between.
  • the purge gas supply line G16 is provided with a purge valve 71, and this purge gas supply line G16 can be opened and closed.
  • the control device 60 closes the EGR outlet valve 51 and opens the purge valve 71 when the EGR operation stop signal S2 is input. Then, the entire exhaust gas from the engine body 11 is discharged to the outside from the exhaust line G3. Further, part of the scavenging air of the air supply line G1 is supplied to the purge gas supply line G16, and is supplied from the purge gas supply line G16 to the exhaust line G3 through the exhaust gas recirculation lines G4, G5, G7. Therefore, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are removed by the purge gas, and the purge gas containing the corrosive components is discharged to the exhaust line G3.
  • the exhaust gas recirculation lines G4, G5, G7, the EGR inlet valve 41, the scrubber 42, the EGR blower 50, the EGR outlet valve 51, the exhaust gas recirculation A purge gas is supplied to the line G7 to provide a purge gas supply line G16 as a purge device for discharging remaining corrosive components.
  • the purge device uses a part of scavenging gas supplied to the engine main body 11 as a purge gas. Supply to
  • the purge device supplies a part of scavenging gas as the purge gas from the purge gas supply line G16 to the exhaust gas recirculation line G4, the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7 are discharged together with the scavenging air. Therefore, by removing the corrosive components remaining in the exhaust gas recirculation lines G4, G5, G7, it is possible to prevent the corrosion of the pipes constituting the exhaust gas recirculation lines G4, G5, G7.
  • the marine diesel engine has been described using the main engine, but the invention can also be applied to a diesel engine used as a generator.

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
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  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
PCT/JP2016/059015 2015-03-31 2016-03-22 Ｅｇｒシステム WO2016158570A1 (ja)

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JP2016194258A (ja) 2016-11-17

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