JP6395785B2 - Marine engine system - Google Patents

Description

  The present invention relates to a marine engine system.

  The marine engine system includes, for example, a supply gas passage for supplying a supply gas to be supplied to the engine, and a gas cooler for cooling the supply gas that has been compressed and heated. The supply gas before being supplied to the engine may contain water droplets. For this reason, water droplets are removed from the supply gas by a water mist catcher provided in the middle of the supply gas flow path.

  Here, for example, in Patent Document 1, a pipe member that comes into contact with the gas is provided on the upstream side in the flow direction of the gas passing through the mist catcher, and a part of components such as sulfuric acid contained in the gas is caused to collide with the pipe member. A technique for extending the life of the mist catcher by removing the mist catcher is disclosed.

US Pat. No. 8,123,844B2

  In a marine engine system, a supply gas flow path may be bent and provided in a compact manner for the purpose of arranging in a limited inboard space. As a result, the flow of the supply gas flowing through the supply gas flow path may be biased (hereinafter referred to as a drift) in the cross section of the supply gas flow path. When such a drift occurs, the water droplets collected by the water mist catcher in a region where the flow velocity is relatively high re-scatters, and the water droplet removal efficiency decreases in a region where the flow velocity is relatively low, resulting in poor water droplet removal. There is.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent water drop removal failure of a water mist catcher caused by a drift of supply gas flowing through a supply gas passage in a marine engine system.

  In order to solve the above problems, a marine engine system according to an aspect of the present invention includes an engine, a supply gas passage through which a supply gas supplied to the engine flows, and the supply gas passes through the supply gas. A gas cooler that is provided in the middle of the flow path and that cools the supply gas; and a rectifying member that is provided downstream of the gas cooler in the flow direction of the supply gas in the supply gas flow path and rectifies the supply gas; A water mist catcher that is provided on the downstream side of the flow direction in the supply gas flow path from the rectifying member and removes water droplets contained in the supply gas.

  According to the said structure, the supply gas which passed the rectification | straightening member provided in the supply gas flow path passes the water mist catcher provided in the downstream of the rectification member. For this reason, the supply gas can be rectified by the rectifying member and the supply gas can be prevented from drifting, so that water droplets generated by cooling the supply gas by the gas cooler can be prevented from splashing again by the water mist catcher. However, water droplets contained in the supply gas can be efficiently removed by the water mist catcher. Thereby, the water droplet removal failure of the water mist catcher due to the occurrence of the drift of the supply gas can be prevented.

  The rectifying member may have a plurality of holes through which the supply gas passes. Accordingly, the supply gas can be efficiently rectified by passing the supply gas through the plurality of holes of the rectifying member provided in the supply gas flow path.

  The rectifying member may be a plate-like member having a plurality of holes formed on a plate surface, and the plate surface may extend in a flow path cross-sectional direction of the supply gas flow path. As a result, the rectifying member can be manufactured with a relatively simple configuration by configuring the rectifying member with a plate-like member having a plurality of holes formed on the plate surface, and the rectifying member can be efficiently used in a limited space on the ship. While being arranged, it is possible to prevent the supply gas from drifting.

  An EGR device for recirculating a part of the exhaust gas discharged from the engine as EGR gas to the engine, and an EGR gas flow path through which the EGR gas discharged from the EGR device flows, An EGR gas channel is connected to the supply gas channel in a region downstream of the gas cooler of the supply gas channel in the flow direction and upstream of the rectifying member in the flow direction; May be supplied to the engine as part of the supply gas.

  As a result, even when EGR gas is merged as part of the supply gas and uneven flow is likely to occur, the flow of the supply gas can be prevented by the flow straightening member, and water droplets of the supply gas can be efficiently removed by the water mist catcher. .

  The EGR gas is ejected from the outlet of the EGR gas passage toward the inside of the supply gas passage, and the ejection direction of the EGR gas from the outlet intersects the flow direction in the rectifying member. Also good.

  As a result, even when EGR gas is ejected from the outlet of the EGR gas flow path in a direction crossing the flow direction of the supply gas in the rectifying member, the rectified supply gas is prevented from being generated by the rectifying member to prevent the supply gas from drifting. Can be easily passed through the water mist catcher.

  The supply gas flow path extends from above the flow straightening member toward the upstream end portion of the flow straightening member, and from the downstream end portion of the water mist catcher to above the water mist catcher. And a second flow path extending in the direction.

  Thereby, even if the supply gas flow path is bent by having the first flow path and the second flow path, a rectifying member is provided between the first flow path and the second flow path. Thus, the supply gas in which the occurrence of drift is prevented can be passed through the water mist catcher, and water droplets contained in the supply gas can be efficiently removed by the water mist catcher.

  The apparatus further includes a supply gas pipe in which a part of the supply gas flow path is formed and the water mist catcher and the rectifying member are disposed inside the supply gas flow path. On the inner side, the rectifying member is separated from the water mist catcher upstream of the flow direction in the supply gas flow path, and the rectifying member is connected to the water mist catcher and the supply gas pipe at a peripheral edge of the flow path cross section. The water mist catcher may be fixed to the supply gas pipe while being supported by an inner wall.

  As a result, the water mist catcher can be fixed to the supply gas pipe while the rectification member is supported by the water mist catcher and the supply gas pipe, and at the inner side of the peripheral edge of the cross section of the supply gas flow path, By separating the mist catcher, the supply gas rectified by the rectifying member can be easily passed through the water mist catcher.

  According to each aspect of the present invention, in the marine engine system, it is possible to prevent water drop removal failure of the water mist catcher due to the occurrence of a drift of the supply gas flowing through the supply gas passage.

FIG. 1 is a schematic configuration diagram of a marine engine system according to an embodiment. FIG. 2 is a side view of the supply gas pipe unit of FIG. 1 viewed from one direction. 3 is a vertical cross-sectional view of the supply gas pipe unit of FIG. 2 partially and perpendicular to one direction. FIG. 4 is a perspective view of the rectifying member and the second water mist catcher as viewed from the upstream side of the supply gas flow direction inside the supply gas pipe unit of FIG. 2. FIG. 5 is a schematic flow velocity distribution diagram of the supply gas on the upstream end face of the second water mist catcher when no rectifying member is provided. FIG. 6 is a schematic flow velocity distribution diagram of the supply gas on the upstream end face of the second water mist catcher when the rectifying member of FIG. 1 is provided.

  Hereinafter, embodiments will be described with reference to the drawings. As long as there is no notice, "upstream side" shows the upstream of the supply gas distribution direction in supply gas flow path R1. The “downstream side” indicates the downstream side of the supply gas flow path R1 in the flow direction of the supply gas. The “circulation direction” indicates the distribution direction of the supply gas in the supply gas channel R1. The “channel cross section” refers to a cross section of the supply gas channel R1.

[Ship engine system]
FIG. 1 is a schematic configuration diagram of a marine engine system 1 (hereinafter also simply referred to as an engine system 1) according to an embodiment. The engine system 1 includes an engine 2, an EGR (Exhaust Gas Recirculation) device 3, a supercharger 5, a supply gas pipe unit 6, a supply gas passage R1, an exhaust gas passage R2, and an EGR gas passage R3.

  The engine 2 is a main propulsion unit for a ship and is a two-stroke diesel engine. The engine 2 may be a four-stroke engine, a gas engine, or a dual fuel engine. The supply gas is a scavenging gas when the engine 2 is a two-stroke engine, and a supply gas when the engine 2 is a four-stroke engine.

  The EGR device 3 recirculates a part of the exhaust gas discharged from the engine 2 to the engine 2 as EGR gas. Specifically, the EGR device 3 cleans and cools the EGR gas and recirculates it to the engine 2 as part of the supply gas. The EGR device 3 includes a scrubber 7, an EGR gas cooler 8, a first water mist catcher (EGR water mist catcher) 9, and a blower 10.

  The scrubber 7 desulfurizes and dedustes high-pressure EGR gas discharged from the engine 2 in contact with the liquid. The EGR gas cooler 8 cools the desulfurized and dedusted EGR gas. The first water mist catcher 9 removes water droplets of condensed water contained in the cooled EGR gas. The blower 10 pressurizes the EGR gas discharged from the EGR device 3 and distributes it to the EGR gas flow path R3. The EGR gas is mixed with fresh air in the supply gas flow path R1.

  The supercharger 5 includes a turbine unit 11 and a compressor unit 12. The supercharger 5 drives the turbine unit 11 with exhaust gas discharged from the engine 2 and flowing through the exhaust gas passage R2. The compressor unit 12 is connected to the turbine unit 11 and is driven by the driving force of the turbine unit 11. The supercharger 5 compresses fresh air by the compressor unit 12 and distributes the fresh air to the supply gas flow path R1.

  The supply gas pipe unit 6 includes a supply gas pipe 14, a gas cooler 15, a rectifying member 16, and a second water mist catcher 17. The supply gas pipe 14 has a part of the supply gas channel R1 formed therein. The supply gas pipe 14 extends in the flow direction. As an example, in the supply gas pipe unit 6, the supply gas pipe 14 is bent in a substantially U shape. Thus, the supply gas is introduced into the supply gas pipe 14 from the upper side to the lower side of the supply gas pipe unit 6, and is discharged from the supply gas pipe 14 from the lower side to the upper side of the supply gas pipe unit 6.

  The gas cooler 15, the rectifying member 16, and the second water mist catcher 17 are disposed inside the supply gas pipe 14. The gas cooler 15 is provided in the middle of the supply gas flow path R1, and cools the supply gas that has been compressed by the compressor unit 12 and heated. As an example, the gas cooler 15 is disposed on the upstream side of the supply gas pipe 14.

  The rectifying member 16 is provided downstream of the gas cooler 15 and rectifies the supply gas. The second water mist catcher 17 is provided on the downstream side of the rectifying member 16 and removes water droplets contained in the supply gas. The flow regulating member 16 and the second water mist catcher 17 are disposed at the lowest position of the supply gas pipe 14 inside the supply gas pipe unit 6.

  The supply gas flow path R <b> 1 extends from the supercharger 5 toward the engine 2. The supply gas flow path R <b> 1 distributes fresh air (atmosphere) taken in from the outside by the supercharger 5 and EGR gas that has circulated through the EGR gas flow path R <b> 3 as supply gas, and supplies the supply gas to the engine 2. The exhaust gas flow path R <b> 2 extends from the engine 2 toward the supercharger 5. The exhaust gas flow path R2 circulates the exhaust gas discharged from the engine 2 and supplies it to the supercharger 5.

  The EGR gas flow path R3 branches from the middle of the exhaust gas flow path R2 and extends toward the EGR device 3. The EGR gas flow path R3 is connected to the supply gas flow path R1 in a region downstream of the gas cooler 15 of the supply gas flow path R1 and upstream of the rectifying member 16. The downstream end of the EGR gas flow path R3 is connected to the supply gas flow path R1 inside the supply gas pipe unit 6. The EGR gas flows through the EGR gas flow path R3. In the engine system 1, the EGR device 3 is not essential, and the EGR device 3 may be omitted. Hereinafter, the details of the supply gas pipe unit 6 will be described.

[Supply gas pipe unit]
FIG. 2 is a side view seen from one direction of the supply gas pipe unit 6 of FIG. FIG. 3 is a vertical sectional view of the supply gas pipe unit 6 of FIG. 2 partially and perpendicular to the one direction. FIG. 3 shows a vertical cross section of the rectifying member 16 and the second water mist catcher 17 inside the supply gas pipe unit 6. FIG. 4 is a perspective view of the rectifying member 16 and the second water mist catcher 17 as viewed from the upstream side in the supply gas flow direction inside the supply gas pipe unit 6 of FIG.

  As shown in FIGS. 2-4, the rectification | straightening member 16 has the some hole 16a through which supply gas distribute | circulates as an example. Specifically, the rectifying member 16 is a plate-like member having a plurality of holes 16a formed on the plate surface. The plate surface of the rectifying member 16 extends in the flow path cross-sectional direction. The rectifying member 16 is a punching metal as an example. The peripheral shape of the hole 16a is circular as an example, but is not limited thereto. The peripheral shape of the hole 16a may be, for example, any of a triangle, a rectangle, a polygon, and an indefinite shape.

  The rectifying member 16 may be, for example, a mesh member such as expanded metal, or may be a guide blade that guides the supply gas, or a partition member that partitions the supply gas flow path R1.

  The rectifying member 16 includes a lower plate portion 16b, a center plate portion 16c, an upper plate portion 16d, a lower step portion 16e, and an upper step portion 16f. The lower plate portion 16 b and the upper plate portion 16 d extend in the vertical direction and the horizontal direction, and are in contact with the upstream end portion of the second water mist catcher 17. The central plate portion 16c extends in the flow path cross-sectional direction. The central plate portion 16c is located inside the peripheral edge of the flow path cross section. The lower step portion 16e is located between the lower plate portion 16b and the central plate portion 16c and extends upstream from the upper end of the lower plate portion 16b. The upper stepped portion 16f is located between the upper plate portion 16d and the central plate portion 16c, and extends upstream from the lower end of the upper plate portion 16d. The center plate portion 16c is connected to the upstream end portions of the lower step portion 16e and the upper step portion 16f and protrudes more upstream than the lower plate portion 16b and the upper plate portion 16d. Thus, the central plate portion 16 c is separated from the upstream end portion of the second water mist catcher 17.

  As an example, the shortest distance between the center plate portion 16c and the second water mist catcher 17 is such that the flow velocity of the jet generated by the supply gas passing through the hole 16a of the center plate portion 16c is that of the second water mist catcher 17. It is set to a value that hardly affects water drop removal.

  As an example, the cross-sectional shape of the flow path of the supply gas at the upstream end of the rectifying member 16 is different from the cross-sectional shape of the flow path of the supply gas at the upstream end of the second water mist catcher 17. The effect of rectification is enhanced.

  The number of rectifying members 16 is not limited to one. When the restriction on the internal volume of the supply gas pipe unit 6 is relatively low, for example, a plurality of rectifying members 16 may be provided separated in the flow direction.

  The second water mist catcher 17 has a rectangular parallelepiped appearance. The 2nd water mist catcher 17 is arrange | positioned so that an upstream end surface may be extended in a flow-path cross-sectional direction. The second water mist catcher 17 has a plurality of collecting plates 18.

  The collecting plate 18 has a plate surface extending in the vertical direction and the flow direction. As an example, the plurality of collecting plates 18 are arranged side by side in the direction perpendicular to the flow direction. The some collection board 18 may be arrange | positioned along with the distribution direction. The collection plate 18 is supported by a plurality of ribs 26 erected on the lower surface of the supply gas pipe 14.

  As an example, the plate surface of the collecting plate 18 is curved with respect to the flow direction of the collecting plate 18. When the supply gas passes through the interval between the adjacent collection plates 18, water droplets contained in the supply gas are collected by inertial collision with the curved plate surface of the collection plate 18. The water droplets collected on the collection plate 18 fall and are discharged to the outside of the supply gas flow path R1 through a pipe (not shown). The number and shape of the collecting plates 18 are not limited. Moreover, the 2nd water mist catcher 17 is not limited to what has the collection board 18, For example, you may have a wire mesh demister.

  Here, a plate-like upper support member 24 is provided above the inner wall of the supply gas pipe 14. A plate-like lower support member 25 is provided below the inner wall of the supply gas pipe 14. An insertion hole 25a through which water that has been removed from the supply gas and dropped is provided in the lower portion of the lower support member 25.

  The upper plate portion 16 d is sandwiched between the upper support member 24 and the second water mist catcher 17. The lower plate portion 16 b is sandwiched between the lower support member 25 and the second water mist catcher 17. The upper portion of the upstream end portion of the second water mist catcher 17 is supported by the upper support member 24 in the flow direction via the upper plate portion 16d. The lower part of the upstream end of the second water mist catcher 17 is supported by the lower support member 25 in the flow direction via the lower plate part 16b. Inside the supply gas pipe 14, the rectifying member 16 and the second water mist catcher 17 are positioned by the upper support member 24 and the lower support member 25.

  Thus, in the supply gas pipe unit 6, the rectifying member 16 is separated upstream from the second water mist catcher 17 on the inner side of the peripheral edge of the flow path cross section, and the rectifying member 16 is second on the peripheral edge of the flow path cross section. The second water mist catcher 17 is fixed to the supply gas pipe 14 while being supported by the water mist catcher 17 and the inner wall of the supply gas pipe 14. Specifically, the second water mist catcher 17 is fixed to a bracket (not shown) provided on the side wall portion 14b of the supply gas pipe 14 by fastening members B1 and B2.

  The supply gas pipe unit 6 further includes a nozzle unit 19 and a flange member 20. The nozzle unit 19 neutralizes the water droplets by supplying a neutralizing agent to the water droplets collected by the second water mist catcher 17. The nozzle unit 19 includes a piping member 21 and an injection nozzle 22. The piping member 21 is disposed on the upstream side of the rectifying member 16 at a position overlapping the upper portion of the rectifying member 16 when viewed from the flow direction. The injection nozzle 22 is connected to the piping member 21. The injection nozzle 22 is provided so as to penetrate the rectifying member 16 in the thickness direction.

  The neutralizing agent is ejected from the injection nozzle 22 toward the water droplets collected by the second water mist catcher 17, and is discharged to the outside of the supply gas flow path R1 together with the water droplets collected by the second water mist catcher 17. . The nozzle unit 19 is not essential. The nozzle unit 19 may be omitted when the degree of neutralization of the water droplets collected by the second water mist catcher 17 is high.

  The nozzle unit 19 may be provided on either the upstream side or the downstream side of the rectifying member 16. When the injection position of the injection nozzle 22 is directed to the downstream side of the rectifying member 16, the neutralizing agent droplets injected from the injection nozzle 22 are not subjected to the drift of the supply gas, and are supplied to the second water mist catcher 17. This is desirable because it is supplied uniformly.

  The eaves member 20 prevents a relatively large water droplet falling from the gas cooler 15 from coming into contact with the flow regulating member 16 and the second water mist catcher 17. The eaves member 20 is a plate-like member. The eaves member 20 extends downward from the upper part of the second water mist catcher 17 toward the upstream side. A flange 23 is provided at the upstream end of the flange member 20. The water droplets falling from the gas cooler 15 flow from the downstream side toward the upstream side on the upper surface of the flange member 20, and are then guided downward from the side of the rectifying member 16 through the flange 23 and discharged to the outside of the supply gas flow path R1. Is done.

  The supply gas channel R1 has a first channel R4 and a second channel R5. The first flow path R <b> 4 extends downward from the rectifying member 16 toward the upstream end of the rectifying member 16. The second flow path R <b> 5 extends from the downstream end of the second water mist catcher 17 toward the upper side of the second water mist catcher 17.

  In this embodiment, the window part 14a is formed in the side wall part 14b on one side of the supply gas pipe 14 (the side wall part 14b on the back side in FIG. 2). The window portion 14 a is formed so that the rectifying member 16 has a peripheral shape and dimensions that allow the rectifying member 16 to be inserted into the supply gas pipe 14 from the side of the supply gas pipe 14.

  In the supply gas pipe unit 6, the rectifying member 16 is inserted into the supply gas pipe 14 through the window part 14a, the upper plate part 16d is brought into contact with the upper support member 24, and the lower plate part 16b is set to the lower support member. 25, the second water mist catcher 17 is inserted into the supply gas pipe 14 through the window portion 14a, and the upper part of the upstream end of the second water mist catcher 17 is the upper plate portion. The lower portion of the upstream end of the second water mist catcher 17 is in contact with the lower plate portion 16 b, and the second water mist catcher 17 is fixed to the supply gas pipe 14. Thus, even after the supply gas pipe 14 is manufactured, the rectifying member 16 and the second water mist catcher 17 can be easily taken in and out of the supply gas pipe 14, and the assembly and maintenance of the supply gas pipe unit 6 are facilitated. And is raised.

  The EGR gas is ejected from the outlet of the EGR gas channel R3 toward the inside of the supply gas channel R1. As shown in FIG. 4, the outlet of the EGR gas flow path R <b> 3 is connected to the side wall portion 14 b of the supply gas pipe 14. The ejection direction of EGR gas from the outlet of the EGR gas flow path R3 intersects with the flow direction of fresh air flowing through the first flow path R4. For this reason, in the first flow path R4, the flow direction of the supply gas immediately before passing through the rectifying member 16 is easily affected by the flow of EGR gas.

  FIG. 5 is a schematic flow velocity distribution diagram of the supply gas on the upstream end face of the second water mist catcher when no rectifying member is provided. FIG. 6 is a schematic flow velocity distribution diagram of the supply gas on the upstream end face of the second water mist catcher 17 when the rectifying member 16 of FIG. 1 is provided. In FIGS. 5 and 6, the linear density is displayed darker in the region where the flow velocity is higher.

  As shown in FIG. 5, when the rectifying member is not provided, the supply gas that has caused the drift flows through the upstream end surface of the second water mist catcher. This is due to the fact that the EGR gas flowing in a direction different from the flow direction of the fresh air is mixed with the fresh air, or the supply gas flows through the supply gas pipe bent in the supply gas pipe unit. It is conceivable that the gas flow rate varies in the cross section of the flow path.

  As shown in FIG. 6, when the rectifying member 16 is provided for this, on the upstream end surface of the second water mist catcher 17, the supply gas whose flow velocity is made uniform in the cross section of the flow channel circulates. As the cause, it is considered that the excessive flow velocity of the supply gas was reduced by the rectifying member 16 and the supply gas was rectified, thereby preventing the supply gas from drifting.

  As described above, according to the engine system 1, the supply gas that has passed through the rectifying member 16 provided in the supply gas flow path R <b> 1 passes through the second water mist catcher 17 provided on the downstream side of the rectifying member 16. pass.

  Therefore, the supply gas can be rectified by the rectifying member 16 and the supply gas can be prevented from drifting, so that water droplets of condensed water generated by cooling the supply gas by the gas cooler 15 and EGR gas merge with fresh air. In this case, water droplets contained in the supply gas are more efficiently removed by the second water mist catcher 17 while preventing the water droplets of the condensed water generated by cooling the supply gas from splashing again after contacting the second water mist catcher 17. Can be removed well. Thereby, the water droplet removal defect of the 2nd water mist catcher 17 by generation | occurrence | production of the drift of supply gas can be prevented.

  In the present embodiment, the neutralizing agent is injected from the injection nozzle 22 into the water droplets collected by the second water mist catcher 17, but the flow straightening of the supply gas is prevented by the rectifying member 16, so that the injection nozzle The neutralizing agent sprayed from 22 can be uniformly supplied to the water droplets collected by the second water mist catcher 17.

  Further, since the rectifying member 16 has a plurality of holes 16a through which the supply gas passes, the supply gas is passed through the plurality of holes 16a of the rectifying member 16 provided in the supply gas flow path R1, and the supply gas is made efficient. Can rectify well.

  The rectifying member 16 is a plate-like member having a plurality of holes 16a formed on the plate surface. Since the plate surface extends in the flow path cross-sectional direction, the rectifying member 16 can be manufactured with a relatively simple configuration. It is possible to prevent the supply gas from drifting while efficiently arranging the flow regulating member 16 in a limited space in the ship.

  Further, the EGR gas flow path R3 is connected to the supply gas flow path R1 in the region downstream of the gas cooler 15 of the supply gas flow path R1 and upstream of the rectifying member 16, and the EGR gas is supplied to the supply gas flow path R1. Therefore, even when EGR gas is merged as part of the supply gas and drift is likely to occur, the flow straightening of the supply gas is prevented by the rectifying member 16 to prevent the supply gas from flowing. Can be removed efficiently with a water mist catcher.

  Further, even when the EGR gas is ejected from the outlet of the EGR gas flow path R3 in a direction crossing the flow direction of the supply gas in the flow regulating member 16, the flow straightened by preventing the flow of the supply gas from being prevented by the flow straightening member 16. The supply gas can be easily passed through the second water mist catcher 17.

  The supply gas flow path R1 includes a first water flow path R4 extending downward from the rectifying member 16 toward the upstream end portion of the rectifying member 16, and a downstream end portion of the second water mist catcher 17 from the second water mist. Since the second flow path R5 extending toward the upper side of the catcher 17 is included, even when the supply gas flow path R1 is bent, the first flow path R4 and the second flow path R5 The supply gas in which the occurrence of drift is prevented by the rectifying member 16 can be passed through the second water mist catcher 17, and water droplets contained in the supply gas can be efficiently removed by the second water mist catcher 17.

  Further, the rectifying member 16 is separated upstream from the second water mist catcher 17 on the inner side of the peripheral edge of the flow path cross section, and the rectifying member 16 is connected to the second water mist catcher 17 and the supply gas pipe at the peripheral edge of the flow path cross section. 14, the second water mist catcher 17 is fixed to the supply gas pipe 14 while being supported by the inner wall 14, so that the rectifying member 16 is supported by the second water mist catcher 17 and the supply gas pipe 14. The second water mist catcher 17 can be fixed to the supply gas pipe 14, and is rectified by the rectifying member 16 by separating the rectifying member 16 and the second water mist catcher 17 inside the peripheral edge of the flow path cross section. The supply gas can be easily passed through the second water mist catcher.

  The present invention is not limited to the above embodiment, and the configuration can be changed, added, or deleted without departing from the spirit of the present invention.

R1 supply gas flow path R3 EGR gas flow path R4 first flow path R5 second flow path 1 marine engine system 2 engine 3 EGR device 14 supply gas pipe 15 gas cooler 16 rectifying member 17 second water mist catcher (water mist catcher)

Claims (6)

Engine,
A supply gas passage through which a supply gas supplied to the engine flows;
A gas cooler provided in the middle of the supply gas flow path for cooling the supply gas;
The supply gas, which is a plate-like member that is provided downstream of the gas cooler in the supply gas flow direction in the supply gas flow path and rectifies the supply gas by passing the supply gas in the plate thickness direction. A rectifying member to be
A water mist catcher that is provided on the downstream side of the flow direction in the supply gas flow path with respect to the rectifying member, and removes water droplets contained in the supply gas by passing the supply gas in the plate thickness direction;
An EGR device for recirculating a part of the exhaust gas discharged from the engine as EGR gas to the engine;
An EGR gas flow path through which the EGR gas discharged from the EGR device flows;
A supply gas pipe in which a part of the supply gas flow path is formed inside and the water mist catcher and the rectifying member are arranged inside,
From the upper part of the water mist catcher, a plate-shaped eaves member extending in the downward direction toward the upstream side of the flow direction than the rectifying member ,
From the direction in which the plate surface of the rectifying member extends in a region downstream of the gas cooler of the supply gas channel in the flow direction and upstream of the rectifying member in the flow direction. Connected to the supply gas flow path,
In a side view, the water mist catcher and the rectifying member are arranged in a state of being separated from the upper end and the lower end of the inner wall of the supply gas pipe to the inside of the supply gas pipe,
A marine engine system in which the EGR gas is supplied to the engine as part of the supply gas.   The marine engine system according to claim 1, wherein the rectifying member has a plurality of holes through which the supply gas passes.   The marine engine system according to claim 2, wherein the rectifying member has a plurality of holes formed on a plate surface, and the plate surface extends in a flow path cross-sectional direction of the supply gas flow path. The EGR gas is ejected from the outlet of the EGR gas channel toward the inside of the supply gas channel,
The marine engine system according to any one of claims 1 to 3, wherein a direction in which the EGR gas is ejected from the outlet intersects the flow direction in the rectifying member.   The supply gas flow path extends from above the flow straightening member toward the upstream end portion of the flow straightening member, and from the downstream end portion of the water mist catcher to above the water mist catcher. The marine engine system according to any one of claims 1 to 4, further comprising: a second flow path extending in a vertical direction. Engine,
A supply gas passage through which a supply gas supplied to the engine flows;
A gas cooler provided in the middle of the supply gas flow path for cooling the supply gas;
A rectifying member that is provided downstream of the gas cooler in the flow direction of the supply gas in the supply gas flow path, and rectifies the supply gas;
A water mist catcher that is provided on the downstream side of the flow direction in the supply gas flow path from the rectifying member, and removes water droplets contained in the supply gas;
A supply gas pipe in which a part of the supply gas flow path is formed and the water mist catcher and the rectifying member are arranged inside,
Inside the peripheral edge of the flow path cross section of the supply gas flow path, the rectifying member is separated upstream of the water mist catcher and the supply gas flow path in the flow direction, and at the peripheral edge of the flow path cross section, the A marine engine system in which the water mist catcher is fixed to the supply gas pipe in a state where a flow regulating member is supported by the water mist catcher and an inner wall of the supply gas pipe.

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