JP3918007B2 - Equipment for preventing exhaust gas recirculation in the engine room of a car carrier - Google Patents

Description

  The present invention relates to an engine room exhaust gas recirculation preventive facility for preventing the engine room exhaust gas discharged from the funnel of an automobile carrier ship from returning to the engine room again through the engine room outside air intake port.

  In recent years, automobile carriers have been required to carry various vehicles with different vehicle heights and a large number of vehicles at once in order to increase the economic effect of transportation costs. Against this background, an automobile carrier ship with a higher height between each deck of the vehicle loading deck and an increased number of layers has been built, and the height from the sea level to the uppermost deck of the automobile carrier ship has increased. ing. On the other hand, since there is a need for vehicles such as car carriers to pass under buildings such as bridges built in harbors, the air draft (Ad) which is the distance from the sea level to the highest position of the ship. ) Height position or arrangement is limited.

  This will be described with reference to FIG. 4 which is a longitudinal sectional view of a car carrier according to a conventional example. FIG. 4 is a view showing that the right side is the bow of the car carrier 50 and receiving a head wind from the direction of the white arrow. In FIG. 4, an automobile carrier 50 has a structure in which cars are loaded on a 13-layer deck of a vehicle loading deck 52 and a No. 13 garage deck 54 from No. 1 to No. 12. The air draft (Ad) is arranged on the right side of the YY line in FIG. As described above, the height or arrangement of the air draft (Ad) is restricted, but in the automobile carrier 50 that is required to be arranged in multiple layers of the vehicle loading deck 52, the top deck 56 and the ship funnel 58 are arranged. The distance from the tip of the engine room exhaust pipe 64 protruding from above tends to be short. In particular, in a car carrier 50 that employs a garage deck as shown in FIG. 4, this distance is smaller than before.

  By the way, in the case of an automobile carrier ship, the engine room casing is arranged on one side (the figure shows the starboard side), and therefore an engine room air blower is arranged directly under the ship funnel. An engine room outside air intake port 60 for supplying fresh outside air to the engine room 68 through the outside air supply pipe 70 is provided close to the tip of the engine room exhaust pipe 64.

  Then, as indicated by the white arrow shown in FIG. 4, when the car carrier ship 50 receives a headwind, the engine room exhaust gas 74 discharged from the tip of the engine room exhaust pipe 64 is laid on the stern side of the car carrier ship 50. The top deck 56 is always surrounded by fresh outside air. However, when the car carrier 50 has a tailwind or relatively no wind, the upper deck 56 is not always surrounded by fresh outside air. This will be described with reference to FIG.

  FIG. 5 is an enlarged view of a portion V in FIG. 4, FIG. 5 (a) is a diagram showing a state in which a car carrier in transit receives a headwind, and FIG. 5 (b) is in transit. It is a figure which shows the state in which the vehicle carrier of the vehicle is receiving the tailwind. As described above, since the engine room outside air intake port 60 is installed close to the tip of the engine room exhaust pipe 64, the wind direction relative to the car carrier 50 is changed as shown in FIG. In the case of a head wind flowing from the bow toward the stern, the engine room exhaust gas 74 released from the tip of the engine room exhaust pipe 64 into the atmosphere flows in the stern direction, and the engine room exhaust gas 74 drifts on the upper deck 56. However, as shown in FIG. 5 (b), the tailwind flows relative to the car carrier 50 from the stern toward the bow even when the car carrier 50 is moving backward, anchored, or even while sailing. Alternatively, in the case of no wind, the engine room exhaust gas 74 may drift on the uppermost deck 56.

The engine room exhaust gas 74 includes not only exhaust gas from the main engine 66 but also exhaust gas from a generator and a boiler (not shown), and contains harmful substances such as CH, CO, NO _X , and SO _X. Of course, when the engine room exhaust gas 34 is recirculated from the engine room outside air intake port 60 to the engine room 68, the inside of the engine room 68 is contaminated. In an extreme case, the gas sensor is activated, and in some cases, the main engine 66 must be stopped, which may hinder the operation of the car carrier 50.

  In order to solve such problems, the applicant of the present application has already proposed Japanese Patent Application Nos. 2004-127777 and 2004-21901 regarding exhaust gas equipment in an engine room.

  The technology of this Japanese Patent Application No. 2004-127777 “provides a ship exhaust gas emission facility that reduces the number of parts and manufacturing man-hours, reduces the installation area of exhaust pipes, and eliminates the installation of dedicated parts such as a spark arrester” The purpose of the present invention is to provide a ship exhaust gas discharge facility that is provided on the rear surface of the stern, has an open air release surface on the rear surface of the stern, and has a discharge space portion formed in a hollow box-like body on the inner side of the hull. An exhaust pipe that communicates with the inside of the exhaust space portion having an open air surface and discharges combustion exhaust gas toward the open air surface of the exhaust space portion, and an end face of the exhaust pipe disposed inside the exhaust space portion Provided with a water spray for spraying water on the end face of the exhaust pipe.

  In addition, the technology of Japanese Patent Application No. 2004-21901 states that “contamination of machines and equipment installed on the bridge and the erosion deck and the automobile loaded on the erosion deck due to the smoke smoke exhausted outside the ship. In addition, the purpose is to provide an engine room flue pipe structure of an automobile carrier ship that expands the effective area for loading automobiles, and this purpose is "to discharge the flue gas from the engine room to the outside of the ship" After connecting one end of the flue pipe to the engine room and extending the other end of the flue pipe to the port side in the horizontal direction, it is set up to the middle part of the sea shield deck and the water line along the port side, This is achieved by extending horizontally and projecting horizontally from an opening formed in the port side stern.

  However, the technologies of Japanese Patent Application No. 2004-127777 and Japanese Patent Application No. 2004-21901 both have a structure in which engine room exhaust gas is discharged into the atmosphere from an opening drilled in the stern, and a ship projecting above the uppermost deck It is not intended for engine room exhaust gas discharged from the funnel.

  Therefore, the applicant of the present application has already proposed Japanese Patent Application No. 2004-335572 (invention title “equipment exhaust gas recirculation prevention equipment for automobile carrier ship”) targeting engine room exhaust gas discharged from a ship funnel.

The technique of Japanese Patent Application No. 2004-335572 will be described with reference to FIG. This technology aims to prevent the exhaust gas 74 in the engine room drifting on the top deck 56 from flowing from the engine room outside air inlet 60 into the engine room 68, and is projected on the ship funnel 58, with the tip on the stern side. A car carrier 50 having an engine room exhaust pipe 64 bent toward the top and an engine room outside air intake port 60 located on the bow side of the ship funnel 58 on the uppermost deck 56, has a tip opening toward the stern side. A blower pipe connected to a blower 62 also serving as a cargo dredge ventilation facility located on the bow side of the engine room outside air intake port 60 on the uppermost deck 56 is installed, and the atmosphere from the engine room exhaust pipe is The engine room exhaust gas 74 discharged from the top of the blower pipe is blown to the engine room exhaust gas 74 that is released into the engine and drifts on the upper deck 56 so that the engine room exhaust gas 74 is sent out in the stern direction. By It is those that have achieved the purpose of the.
Japanese Patent Application No. 2004-127777 Japanese Patent Application No. 2004-21901 JP 2004-335572 A

  However, the technology of Japanese Patent Application No. 2004-335572 prevents the exhaust of the engine room exhaust gas to the engine room by blowing off the exhaust gas of the engine room drifting on the uppermost deck. It was intended to prevent the return to the chamber, not to prevent direct engine room recirculation, and the engine room itself was not intended to blow off the internal exhaust gas.

  Therefore, the present invention is a simple device that directly and reliably ensures that the engine room exhaust gas discharged from the funnel of the car carrier returns to the engine room again through the engine room outside air intake port. The purpose is to prevent.

In order to solve the above-mentioned problem, the engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to claim 1 of the present invention is provided with an engine room air blower for taking in outside air from the outside air inlet and supplying the outside air to the engine room on the upper deck. It is disposed on a garage deck directly below the ship funnel, and the outside air intake port is provided on the side near the engine room air blower.
Moreover, the engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to claim 2 of the present application is the engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to claim 1, wherein the engine room exhaust gas recirculation prevention apparatus is an upper part of the outside air inlet and / or the outside air intake. A blower pipe having a plurality of outlets arranged in a line in a horizontal direction is laid on the ridge side edge of the uppermost deck above the mouth, and air is jetted from the outlet toward the outside of the ship in a film form The air curtain is formed.
Further, the engine room exhaust gas recirculation prevention device for an automobile carrier according to claim 3 of the present application is the engine room exhaust gas recirculation prevention device for an automobile carrier according to claim 2, wherein an elevation angle α which is a blowing angle of the air curtain is preferably 90 °> α ≧ 0 °, more preferably 60 ° ≧ α ≧ 30 °.
Furthermore, the engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to claim 4 of the present application is the engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to any one of claims 1 to 3, wherein The end is connected to the engine room blower.
Moreover, the engine room exhaust gas recirculation prevention equipment of the automobile carrier according to claim 5 of the present application is the engine room exhaust gas reflux prevention equipment of the automobile carrier according to any one of claims 1 to 4, wherein the engine room air blower is provided. Is characterized in that one surface thereof is installed in a fan room on a garage deck, which is a steel casing that also serves as a side wall having the outside air inlet.

  Since the engine room exhaust gas recirculation prevention apparatus of the car carrier according to claim 1 of the present invention has the outside air intake port penetrating on the heel side, the possibility that the exhaust gas of the engine room drifting on the uppermost deck is sucked from the outside air intake port is low. .

  Moreover, in the engine room exhaust gas recirculation prevention apparatus of the car carrier according to claim 2 of the present application, a plurality of lines arranged in a line in a horizontal direction on the upper side of the outside air inlet and / or on the ridge side edge of the uppermost deck above the outside air inlet. A blower pipe with a single outlet is laid, and a film-like air curtain is formed from the outlet toward the outside of the ship. It is blocked and does not take in the exhaust gas from the engine room from the outside air intake port. Further, since the air duct that forms the air curtain is provided close to or on the uppermost deck, the air duct is surely within reach and easy to maintain.

  And in the engine room exhaust gas recirculation prevention apparatus of the motor vehicle carrier which concerns on this-application Claim 3, the elevation angle (alpha) which is the blowing angle of an air curtain is made into 0 degree or more. In other words, since the blowing angle is obliquely upward, the upper part is divided into areas where the exhaust gas concentration in the engine room is high, and the lower part is divided into fresh outside air areas with the air film formed by the air curtain. You can always inhale fresh outside air. Further, by setting the elevation angle α to 60 ° ≧ α ≧ 30 °, it is possible to efficiently prevent the exhaust of the exhaust gas from the engine room to the heel side.

  In the engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to claim 4 of the present application, the base end portion of the blower pipe is connected to the engine room blower. Therefore, in addition to the original function of supplying air to the engine room, the engine room air blower also functions as an air supply function to the air supply pipe, so a separate air supply facility for supplying air to the air supply pipe is unnecessary, and the present invention is implemented The only new equipment to do this is a blast tube with a very simple structure.

  In the engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to claim 5 of the present application, the engine room air blower has a fan on a garage deck, one surface of which is a steel housing also serving as a side wall having an outside air inlet. Located in the room. Since this fan room is a closed space, an intake pipe that connects the outside air intake port and the engine room air blower is unnecessary. Further, on the garage deck, the automobile loading area is clearly defined by a steel wall, so that an operator does not accidentally touch the engine room blower.

  An embodiment according to the best mode for carrying out the present invention will be described with reference to FIGS. FIG. 1 is a schematic side view of an engine room exhaust gas recirculation prevention device for an automobile carrier according to an embodiment, and FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. And FIG. 3 is a partial perspective view of the engine room exhaust gas recirculation prevention equipment of the car carrier according to the embodiment. Moreover, FIG. 4 which is the longitudinal cross-sectional view of the motor vehicle carrier which concerns on the prior art used by description of "background art" is quoted as needed. 1 and 2 are enlarged views of a V portion in FIG. 4, and the same elements as those in FIG. 4 are denoted by the same reference numerals. Moreover, in FIG. 1, the right side of the figure is the bow side as in FIG. 4 described above.

  1 to 3, reference numeral 1 is an engine room exhaust gas recirculation prevention device, reference numeral 10 is an engine room blower, reference numeral 12 is a blower fan, reference numeral 20 is an outside air inlet, reference numeral 22 is an inlet louver, and reference numeral 30 is a blower pipe. , 32 is a horizontal air duct, 34 is a vertical air duct, 34 a is a vertical air feed pipe, 34 b is a vertical air return pipe, 36 is an air curtain, 40 is a fan room, 50 is a car carrier, 54 is a garage deck, 56 is a top deck, 58 is a ship funnel, 64 is an engine room exhaust pipe, 66 is a main engine (shown in FIG. 4), 68 is an engine room (shown in FIG. 4), Reference numeral 70 denotes an outside air supply pipe, reference numeral 74 denotes an engine room exhaust gas, and reference numeral 76 denotes a bridge (shown in FIG. 4).

First, the structure of the engine room exhaust gas recirculation prevention equipment 1 of the car carrier according to the embodiment will be described.
The engine room exhaust gas recirculation prevention equipment 1 is located immediately below the ship funnel 58 and is installed on the garage deck in the fan room 40 partitioned by a steel wall surface, and on the side wall surface of the fan room 40. The outside air inlet 20 is provided in a penetrating manner, and the blower pipe 30 is installed at the heel edge of the uppermost deck 56 above the outside air inlet 20.

  The engine room blower 10 is not specially developed for the present invention, but is a general-purpose engine room blower that has been used in the past. The air is sucked from above and discharged downward.

  The outside air inlet 20 includes an inlet louver 22, and the shape thereof is rectangular in front view, but is not limited to a rectangle, and may be circular or oval. The inlet louver 22 used in the present embodiment may be of a vertical type, but a horizontal type is shown in FIGS. This horizontal type inlet louver 22 is composed of a plurality of plate-like slats, and each slat is attached to the frame of the outside air inlet 20 so that the upper part is drawn into the inside of the ship and the lower part protrudes to the outside of the ship. It has been. The intake louver 22 plays a role of preventing small animals such as birds and flying objects from jumping into the ship and preventing rain and splashing from entering the ship. Further, an insect screen is attached to the inside of the ship of the inlet louver 22 as necessary.

  In the present embodiment, the outside air intake pipe that connects the outside air inlet 20 and the engine room blower 10 is not provided. This is because the fan room 40 forms a closed space. When the blower fan 12 of the engine room air blower 10 is operated, the outside air naturally flows through the outside air intake port 20 to the engine room air blower 10. This is because the air is sucked and an outside air intake pipe may be provided.

  The blower pipe 30 is constituted by a horizontal blower pipe 32 and a vertical blower pipe 34, and the vertical blower pipe 34 is further constituted by a vertical blower feed pipe 34a and a vertical blower return pipe 34b. . The horizontal blower pipe 32 is laid on the edge of the uppermost deck 56 at the upper part of the outside air inlet 20, and both ends of the horizontal blower pipe 32 are respectively connected to the end of the vertical blower feed pipe 34a and the vertical blower return pipe 34b. The other end of the vertical blast feed pipe 34a communicates with the engine room air blower 10, and the other end of the vertical blast return pipe 34b communicates with the end, and the outside air supply for supplying outside air to the engine room 68 (shown in FIG. 4). It communicates with the trachea 70.

  The horizontal air duct 32 has a plurality of air outlets arranged in a line in the horizontal direction, and the air outlet angle α is approximately 50 °. In addition, when the diameter of the outlet is 50 mmφ and 30 kPa of compressed air is fed into the horizontal blower pipe 32, the reach distance H of the compressed air in the absence of wind is 10 m. The length of the horizontal air duct 32 is slightly longer than the width of the outside air inlet 20 in order to cover the outside air inlet 20.

  The engine room exhaust gas recirculation prevention equipment 1 has a gas sensor (not shown) installed in the vicinity of the horizontal blower pipe 32 and a wind direction sensor (not shown) installed on the bridge 76 (shown in FIG. 4). The gas concentration sensed by the gas sensor and the wind direction information sensed by the wind direction sensor are sent to a detection unit (not shown), and the detection unit is installed in the vertical blast feed pipe 34a based on the information. An open / close signal is sent to an open / close valve (not shown).

  Next, the operation of the engine room exhaust gas recirculation prevention equipment 1 of the car carrier according to the embodiment will be described.

  When it is necessary to supply fresh outside air into the engine room 68 such as when the main engine 66 is operated, the engine room air blower 10 is operated to take in the outside air and send the outside air to the outside air supply pipe 70. Fresh fresh air is supplied into the engine room 68. That is, as shown in FIG. 2, when the engine room air blower 10 operates, the outside air indicated by the white arrow flows through the outside air inlet 20 and is sucked from above the engine room air blower 10 as indicated by the broken line arrow A. And discharged downward. Then, as indicated by a dotted arrow B, the air is supplied into the outside air supply pipe 70, flows down the outside air supply pipe 70, and is supplied into the engine room 68.

  When the detection unit determines that the engine room exhaust gas 74 does not drift on the top deck 56 from the gas concentration sent from the gas sensor and the wind direction information sent from the wind direction sensor, such as when the car carrier 50 receives a head wind, The on-off valve interposed in the blower feed pipe 34 a is “closed”, compressed air is not sent to the blower pipe 30, and the outside air sent out by the engine room blower 10 is sent into the exclusive outside air supply pipe 70. The

On the other hand, the gas concentration sent from the gas sensor and the wind direction information sent from the wind direction sensor are within a predetermined reference value range, such as when the car carrier 50 receives a tailwind, and the engine room exhaust gas 74 may drift on the upper deck 56 or on the shore side. When the detection unit determines that there is, the open / close valve interposed in the vertical blower feed pipe 34a is "open" and compressed into the vertical blower feed pipe 34a as shown by the dotted arrow C in FIG. Air is sent. Then, the compressed air flows into the horizontal air duct 32 and is blown out from a plurality of air outlets formed in the horizontal air duct 32 to form an air curtain 36. As described above, in the embodiment, the air curtain 36 has an elevation angle (α) of approximately 50 °, and its effective reach distance H in a windless state is 10 m. Then, the remaining compressed air in the horizontal blast pipe 32 after being used to form the air curtain 36 is discharged into the outside air supply pipe 70 through the vertical blast return pipe 34b.
Due to the presence of the air curtain 36, when the engine room exhaust gas 74 attempts to descend in the vicinity of the outside air inlet 20, the engine room exhaust gas 74 is blown off and cannot reach the outside air inlet 20, and the outside air inlet 20 is fresh. Surrounded by the outside air, fresh outside air always flows from the outside air inlet 20.

FIG. 1 is a schematic side view of an engine room exhaust gas recirculation prevention facility for an automobile carrier according to an embodiment. 2 is a cross-sectional view taken along the line 2-2 in FIG. FIG. 3 is a partial perspective view of the engine room exhaust gas recirculation prevention equipment of the car carrier according to the embodiment. FIG. 4 is an overall longitudinal sectional view of a conventional car carrier. FIG. 5 is an enlarged view of a portion V in FIG. 4, FIG. 5 (a) is a diagram showing a state in which a car carrier in transit receives a headwind, and FIG. 5 (b) is in transit. It is a figure which shows the state in which the vehicle carrier of the vehicle is receiving the tailwind.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine room exhaust gas recirculation prevention equipment 10 Engine room air blower 20 Outside air inlet 30 Air blower pipe 36 Air curtain 40 Fan room 50 Car carrier ship 54 Garage deck 56 Top deck 58 Ship funnel

Claims (5)

An engine room air blower that draws outside air from the outside air inlet and supplies the outside air to the engine room is disposed on the garage deck directly below the ship funnel, which is erected on the top deck,
The outside air intake port is provided on the heel side near the engine room blower,
The engine room exhaust gas recirculation prevention equipment of the car carrier characterized by the above. A blower pipe having a plurality of outlets arranged in a line in the horizontal direction is laid on the upper side of the outside air inlet and / or on the ridge side edge of the uppermost deck above the outside air inlet,
Air is ejected from the outlet toward the outside of the ship to form a film-like air curtain.
The engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to claim 1. The elevation angle α, which is the air curtain blowing angle, is preferably 90 °> α ≧ 0 °, more preferably 60 ° ≧ α ≧ 30 °.
The engine room exhaust gas recirculation prevention equipment for an automobile carrier according to claim 2. The base end portion of the blower pipe is connected to the engine room blower,
The engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to any one of claims 1 to 3. The engine room air blower is installed in a fan room on a garage deck, one surface of which is a steel housing that also serves as a side wall having the outside air inlet.
The engine room exhaust gas recirculation prevention apparatus for an automobile carrier according to any one of claims 1 to 4, wherein

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