JP6461541B2 - Ship - Google Patents

Description

  The present invention relates to a ship equipped with a dual fuel diesel engine.

  Conventionally, diesel engines using heavy oil as fuel have been used as the main propulsion engine in ships, but in recent years, gas-fired diesel engines that use gas as fuel have been used as the main propulsion engine from the viewpoint of air pollution and global warming. The ship that had been attracting attention. Gas-fired diesel engines include, for example, gas-only fired diesel engines, and dual fuel diesel engines that can use both oil and gas as fuel and that can use oil and gas in any proportion.

  A ship equipped with a gas-fired diesel engine as a main engine for propulsion has a high pressure (for example, 15 to 30 MPa) from liquefied gas stored at a cryogenic temperature in a tank on the ship or boil-off gas generated by evaporation of the liquefied gas in the tank. ) Fuel gas and a high pressure gas supply system for supplying it to the engine is required. For example, FIG. 1 of Patent Document 1 discloses a high-pressure gas supply system including a high-pressure pump as a booster. In this high pressure gas supply system, the pressure of the liquefied gas introduced from the tank storing the liquefied gas is increased by a high pressure pump, the increased pressure of the liquefied gas is vaporized by a vaporizer, and the vaporized gas is supplied to a gas-fired diesel engine. And supply. Further, FIG. 7 of Patent Document 2 discloses a high-pressure gas supply system including a high-pressure compressor as a booster. This high-pressure gas supply system boosts the boil-off gas in the tank with a high-pressure compressor and supplies it to a gas-fired diesel engine.

JP2013-209926A Japanese Patent Laid-Open No. 9-209788

  By the way, in a ship equipped with a dual fuel diesel engine, when trouble occurs in the high pressure pump or the high pressure compressor of the gas supply system, the high pressure fuel gas may not be supplied. For example, in a high-pressure pump that pressurizes a cryogenic fluid, cavitation may occur unexpectedly and the pump performance may deteriorate. In such a case, since it becomes impossible to continue the gas operation, an operation using only oil as a fuel from an operation using only gas or both gas and oil (hereinafter simply referred to as “gas operation”) (hereinafter referred to as “fuel operation”). Simply “oil operation”). However, if the ship needs to operate in gas to meet the regulations in the Air Pollutant Emission Control Area (ECA), it will switch to oil operation even if there is a problem with the high-pressure pump or high-pressure compressor. A ship that can continue gas operation without any problems is desired.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a ship equipped with a dual fuel diesel engine that can continue gas operation even when there is a problem with the booster.

  In a ship using a high-pressure pump as a booster, in order to solve the above problem, it is conceivable to provide a spare high-pressure pump in parallel with the main high-pressure pump. Generally, a reciprocating pump such as a piston pump is used as a high-pressure pump that boosts a cryogenic liquefied gas to an injection pressure of a diesel engine. However, such a reciprocating pump cannot be started immediately and requires sufficient cooling before use. This is because if the cryogenic liquefied gas is supplied to the cylinder in a state where the reciprocating pump is not cooled, the liquefied gas is vaporized in the cylinder and the cylinder is filled with the vaporized gas. For this reason, only the compression and expansion of the gas in the cylinder are repeated by the reciprocation of the piston, and there is a concern that the role of the high-pressure pump for boosting the liquefied gas to a desired pressure cannot be achieved. The invention according to claim 1 has been made from such a viewpoint.

  That is, a ship according to one aspect of the present invention includes a reservoir that stores liquefied gas, a vaporizer that vaporizes the liquefied gas, and a dual fuel diesel that uses gas and oil vaporized from the liquefied gas as fuel. An engine; a first pipe for guiding liquefied gas from the reservoir to the vaporizer; a main pump provided in the first pipe for boosting the liquefied gas; and the main pump in the first pipe from the reservoir A spare pipe that is a reciprocating pump including a second pipe connected to a downstream portion of the pipe, a cylinder and a piston that reciprocates in the cylinder, and the reservoir when the main pump is in operation. And a discharge pipe configured to discharge the liquefied gas supplied into the cylinder from the cylinder.

  According to the above configuration, the auxiliary pump is provided in parallel with the main pump that is normally operated during gas operation. The spare pump cannot be operated immediately unless it is sufficiently cooled. However, in the ship of the present invention, when the main pump is operated, the liquefied gas supplied from the reservoir into the cylinder is discharged from the cylinder. Therefore, the preliminary pump can be pre-cooled while the gas operation is performed by the main pump. For this reason, when a trouble occurs in the main pump, the spare pump can be operated immediately, and as a result, the gas operation can be continued without switching to the oil operation.

  The discharge pipe is connected to the reservoir, and when the main pump is operated, the liquefied gas supplied from the reservoir through the second pipe into the cylinder flows from the cylinder to the reservoir. It may be configured. According to this configuration, during operation of the main pump, the liquefied gas supplied for precooling into the cylinder of the spare pump via the second pipe is returned to the reservoir, so that the decrease in the liquefied gas in the reservoir is suppressed. be able to.

  The ship further includes a first on-off valve provided in an upstream portion of the reserve pump in the second pipe, and a second on-off valve provided in the discharge pipe, and the first on-off valve and the The second on-off valve may be closed when the main pump is not operating and may be opened when the main pump is operating. According to this configuration, when the main pump is not in operation, the liquefied gas does not flow through the second pipe and the discharge pipe, so that the cooling of the spare pump can be stopped. In addition, since the liquefied gas does not flow through the second pipe and the discharge pipe, heat input to the reservoir via the discharge pipe can be prevented.

  Further, in a ship using a high-pressure compressor as a booster, in order to solve the above problem, it is conceivable to provide a spare high-pressure compressor in parallel with the main high-pressure compressor. However, the high-pressure compressor takes a large amount of installation space, and it is not preferable to install a spare high-pressure compressor that is not regularly used in ships where space is limited. Even if a spare high-pressure compressor is installed, it takes too much time to start the high-pressure compressor. For this reason, even if the main high-pressure compressor has a problem, even if the start-up of the spare high-pressure compressor is started, the gas pressure supplied to the engine will drop by the time the spare high-pressure compressor is in operation, and the engine will Will switch to oil driving. The invention according to claim 4 is made from such a viewpoint.

  That is, a ship according to another aspect of the present invention includes a reservoir that stores liquefied gas, a dual fuel diesel engine that uses gas and oil vaporized from the liquefied gas as fuel, and the binary from the reservoir. A first pipe connected to a fuel diesel engine; a high-pressure compressor provided in the first pipe for boosting the evaporated gas from which the liquefied gas has evaporated; and a downstream portion of the high-pressure compressor in the first pipe from the reservoir A second pump connected to the second pipe, a spare pump that is a reciprocating pump provided in the second pipe and includes a cylinder and a piston that reciprocates in the cylinder, and a second pump that is provided in a downstream portion of the spare pump. And a vaporizer configured to vaporize the liquefied gas pressurized by the preliminary pump.

  According to the above configuration, the auxiliary pump is provided in parallel with the high-pressure compressor that is normally operated during gas operation. Since the high-pressure pump is smaller in size than the high-pressure compressor, it is easy to secure an installation space on the ship, and the high-pressure pump can boost the fuel to a desired pressure in a shorter time than the high-pressure compressor.

  The ship may further include a discharge pipe configured to discharge the liquefied gas supplied from the reservoir into the cylinder when the high-pressure compressor is in operation. The preliminary pump cannot be operated immediately unless it is sufficiently cooled. According to this configuration, when the high-pressure compressor is operated, the liquefied gas supplied from the reservoir into the cylinder is discharged from the cylinder. Therefore, the preliminary pump can be pre-cooled while the gas operation is performed by the high-pressure compressor. For this reason, when trouble occurs in the high-pressure compressor, the reserve pump can be operated immediately, and as a result, the gas operation can be continued without switching to the oil operation.

  The discharge pipe may be connected to the reservoir, and may be disposed so as to incline upward from the cylinder toward the reservoir. According to this configuration, the liquefied gas can be flowed from the cylinder to the reservoir by natural convection without using a device for flowing the liquefied gas from the cylinder to the reservoir.

  The discharge pipe is configured such that the liquefied gas supplied from the reservoir through the second pipe into the cylinder is discharged by a discharge pump provided in an upstream portion of the reserve pump in the second pipe. It may be configured to be discharged from. According to this configuration, the reservoir, the upstream portion of the reserve pump in the second pipe, the cylinder, and the discharge pipe are reliably separated from the cylinder by the discharge pump without depending on the shape and arrangement of the discharge pipe. The liquefied gas can be passed through the vessel.

  The ship is different from the vaporizer provided in the device consuming the gas vaporized by the liquefied gas, the low-pressure fuel supply pipe connecting the reservoir and the device, and the low-pressure fuel supply pipe. And the discharge pipe is connected to the low-pressure fuel supply pipe on the upstream side of the other vaporizer, and is supplied from the reservoir into the cylinder when the main pump is in operation. The liquefied gas may be configured to be discharged from the cylinder to the low-pressure fuel supply pipe. According to this configuration, since the heated LNG or gas from the cylinder to the reservoir is not returned when the cylinder of the spare pump is cooled, heat input to the reservoir due to cooling in the cylinder can be prevented. .

  For example, the reservoir may be a suction drum. According to this configuration, the discharge pipe is connected to the reservoir, and even if the liquefied gas warmed by the auxiliary pump flows through the discharge pipe, only heat enters the suction drum. It is possible to prevent heat from entering the transport tank or the fuel tank.

  According to the present invention, in a ship equipped with a dual fuel diesel engine, gas operation can be continued even when there is a problem with the booster.

It is a schematic structure figure showing some ships concerning a 1st embodiment of the present invention. It is a schematic block diagram which shows a part of ship which concerns on 2nd Embodiment of this invention. It is a schematic block diagram which shows a part of ship which concerns on 3rd Embodiment of this invention. It is a figure which shows the modification of the ship shown in FIG. It is a schematic block diagram which shows a part of ship which concerns on 4th Embodiment of this invention. It is a schematic block diagram which shows a part of ship which concerns on 5th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Below, the same code | symbol is attached | subjected to the element which is the same or it corresponds through all the drawings, and the overlapping description is abbreviate | omitted.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a ship 1A according to the first embodiment. In this embodiment, the ship 1A is an LNG carrier. A marine vessel 1A according to this embodiment is equipped with a gas-fired diesel engine 13 (hereinafter simply referred to as “engine 13”) as a propulsion main machine that drives a propeller 14. Further, the ship 1A according to this embodiment includes a gas supply system 10A for supplying high-pressure gas as fuel to the engine 13.

  The engine 13 according to this embodiment is an electronically controlled gas injection (ME-GI) type dual fuel engine capable of electronically controlling oil and gas injection, and is a two-cycle low-speed diesel engine. The engine 13 is an operation that uses only oil as fuel by electronic control (hereinafter referred to as “oil operation”), and an operation that uses only gas or both oil and gas as fuel (hereinafter referred to as “gas operation”). Can be switched. Since the engine 13 can also use oil as fuel, the ship 1A includes an oil supply system 16 for supplying fuel oil to the engine 13 in addition to the gas supply system 10A. Hereinafter, the gas supply system 10A will be described. A description of the oil supply system 16 will be omitted.

  The gas supply system 10 </ b> A is provided in the reservoir 11 that stores LNG, the vaporizer 12 that vaporizes LNG, the first pipe 31 that guides LNG from the reservoir 11 to the vaporizer 12, and the first pipe 31. Is provided with a main pump 20 for boosting the pressure. The gas supply system 10 </ b> A further includes a second pipe 33 connected from the reservoir 11 to the downstream portion 31 b of the main pump 20 in the first pipe 31, and a reserve pump 50 provided in the second pipe 33. Furthermore, the gas supply system 10 </ b> A further includes a third pipe 35 that guides the gas vaporized by the vaporizer 12 from the vaporizer 12 to the engine 13.

  The reservoir 11 is, for example, at least one of large transport tanks arranged in the ship length direction of the ship 1A. When a suction drum is provided between the transport tank and the main pump 20, the reservoir 11 is a suction drum. The reservoir 11 has a heat insulating performance capable of maintaining a cryogenic state so that LNG can be held in a liquid state of about −162 ° C. under atmospheric pressure.

  The vaporizer 12 is, for example, a heat exchanger in which a meandering tube is disposed in a shell, and both ends of the tube are connected to the first pipe 31 and the third pipe 35. The shell is connected to a circulation line (not shown), and a heat medium such as glycol is circulated through the shell and the circulation line. The vaporizer 12 may be an electric heater.

  The main pump 20 and the auxiliary pump 50 are reciprocating pumps that increase the pressure of LNG so that the gas vaporized by the vaporizer 12 becomes the injection pressure of the engine 13. The main pump 20 is operated at the time of gas operation of the engine 13 and supplies the pressurized LNG to the vaporizer 12. The spare pump 50 is a pump for operating the engine 2 by operating it when the main pump 20 is not in operation, for example, when trouble occurs in the main pump 20 and high-pressure fuel gas cannot be supplied. The main pump 20 and the spare pump 50 are arranged in a normal temperature environment.

  The main pump 20 has a plurality of cylinders 22 and a plurality of pistons 21 accommodated therein. The main pump 20 has one liquid chamber 23 formed in each cylinder 22 by the inner wall of the cylinder 22 and the end face of the piston 21. The liquid chamber 23 is configured such that the volume changes as the piston 21 reciprocates in the cylinder 22. Similarly, the preliminary pump 50 includes a plurality of cylinders 52 and a plurality of pistons 51 accommodated therein. The preliminary pump 50 has one liquid chamber 53 formed by the inner wall of the cylinder 52 and the end face of the piston 51 in each cylinder 52. The liquid chamber 53 is configured such that the volume changes as the piston 51 reciprocates in the cylinder 52. In FIG. 1 and the subsequent drawings, only one of the plurality of cylinders is shown and the others are omitted to simplify the drawing. Further, in FIG. 1, the main pump 20 is depicted above the spare pump 50, but the main pump 20 and the spare pump 50 are actually side by side.

  A first on-off valve 41 is provided in the upstream portion 31 a of the main pump 20 in the first pipe 31. The main pump 20 is provided with a check valve (not shown) so that LNG does not flow backward from the main pump 20 to the reservoir 11. Similarly, a first opening / closing valve 44 is provided on the upstream portion 33 a of the preliminary pump 50 in the second pipe 33. The reserve pump 50 is provided with a check valve (not shown) so that LNG does not flow back from the reserve pump 50 to the reservoir 11.

  The main pump 20 has a supply port 23 a that supplies LNG guided from the upstream portion 31 a of the main pump 20 in the first pipe 31 into the cylinder 22 of the main pump 20. The main pump 20 has a discharge port 23 c that discharges LNG from the cylinder 22 of the main pump 20 to the downstream portion 31 b of the main pump 20 in the first pipe 31 when the main pump 20 is in operation. The discharge port 23 c is provided with a check valve (not shown) so that LNG does not flow backward from the discharge port 23 c into the cylinder 22. Further, the main pump 20 has a discharge port 23 b for discharging LNG in the cylinder 22.

  The auxiliary pump 50 has a supply port 53 a that supplies LNG guided from the upstream portion 33 a of the auxiliary pump 50 in the second pipe 33 into the cylinder 52 of the auxiliary pump 50. Further, the spare pump 50 has a discharge port 53 c that discharges LNG from the cylinder 52 of the spare pump 50 to the downstream portion 33 b of the spare pump 50 in the second pipe 33 when the spare pump 50 is in operation. The discharge port 53 c is provided with a check valve (not shown) so that LNG does not flow backward from the discharge port 53 c into the cylinder 52. Further, the spare pump 50 has a discharge port 53b for discharging LNG in the cylinder 52.

  The gas supply system 10A includes a first discharge pipe 32 that connects the reservoir 11 and the discharge port 23b of the main pump 20, and a second discharge pipe that connects the reservoir 11 and the discharge port 53b of the auxiliary pump 50 (the present invention). 34).

  The upstream portion 31a of the main pump 20 in the first pipe 31 and the first discharge pipe 32 are LNG from the reservoir 11 upstream of the main pump 20 in the first pipe 31 due to natural convection when the main pump 20 is not in operation. The LNG supplied into the cylinder 22 via the portion 31 a and configured to flow into the cylinder 22 flows from the discharge port 23 b to the reservoir 11. For example, the first discharge pipe 32 is arranged to incline upward from the discharge port 23 b located at the upper part of the cylinder 22 of the main pump 20 toward the reservoir 11. The discharge port 23b is located above the supply port 23a. Although arrangement | positioning of the upstream part 31a of the main pump 20 in the 1st piping 31 is not limited, It is desirable to be laid under the storage device 11.

  Similarly, the upstream portion 33a of the auxiliary pump 50 in the second pipe 33 and the second discharge pipe 34 are supplied from the reservoir 11 to the auxiliary pump 50 in the second pipe 33 by natural convection when the auxiliary pump 50 is not in operation. The LNG supplied into the cylinder 52 via the upstream portion 33a of the gas and the LNG supplied into the cylinder 52 flows from the discharge port 53b to the reservoir 11. For example, the second discharge pipe 34 is arranged so as to be inclined upward as it goes from the discharge port 53 b located in the upper part of the cylinder 52 of the auxiliary pump 50 toward the reservoir 11. The discharge port 53b is located above the supply port 53a. Although arrangement | positioning of the upstream part 33a of the preliminary | backup pump 50 in the 2nd piping 33 is not limited, It is desirable to be laid under the storage device 11.

  The first discharge pipe 32 is provided with a second on-off valve 42, and the second discharge pipe 34 is provided with a second on-off valve 45. In addition, a third opening / closing valve 43 is provided on the downstream side portion 31b of the main pump 20 in the first piping 31 and on the upstream side portion from the junction of the first piping 31 and the second piping 33, A third on-off valve 46 is provided in the downstream portion 33 b of the preliminary pump 50 in the second pipe 33. The first on-off valves 41 and 44, the second on-off valves 42 and 45, and the third on-off valves 43 and 46 are controlled to open and close by the control device 15. In FIG. 1 and the subsequent drawings, only one control line is shown between each component controlled by the control device 15 and the control device 15 to simplify the drawing, and the others are omitted. Yes.

  Before the main pump 20 is operated, the inside of the cylinder 22 of the main pump 20 needs to be sufficiently cooled. For this reason, when the inside of the cylinder 22 of the main pump 20 is cooled just before the main pump 20 is operated, the control device 15 opens the first on-off valve 41 and the second on-off valve 42, and the third on-off valve. 43 is closed. Further, when the main pump 20 is in operation, the first opening / closing valve 41 and the third opening / closing valve 43 are opened by the control device 15 in order to supply LNG from the cylinder 22 to the vaporizer 12. In addition, when the main pump 20 is in operation, the second on-off valve 42 is opened in order to return the gas evaporated from LNG in the cylinder 22 to the reservoir 11 during operation of the main pump 20.

  Before operating the preliminary pump 50, it is necessary to sufficiently cool the inside of the cylinder 52 of the preliminary pump 50. Therefore, when the main pump 20 is in operation and the inside of the cylinder 52 of the auxiliary pump 50 is cooled, the control device 15 opens the first on-off valve 44 and the second on-off valve 45 and the third on-off valve 46. Is closed. Further, when the preliminary pump 50 is in operation, the first opening / closing valve 44 and the third opening / closing valve 46 are opened by the control device 15 in order to supply LNG from the cylinder 52 to the vaporizer 12. Further, when the spare pump 50 is in operation, the second on-off valve 45 is opened in order to return the gas evaporated from LNG in the cylinder 52 to the reservoir 11 while the spare pump 50 is in operation.

  The auxiliary pump 50 is precooled in the cylinder 52 of the auxiliary pump 50 continuously or intermittently at least when the main pump 20 is operated so that the auxiliary pump 50 can be started immediately when a trouble occurs in the main pump 20. Is done. For example, at the start of operation of the main pump 20, the control device 15 opens the first on-off valve 44 and the second on-off valve 45 and closes the third on-off valve 46. For this reason, the LNG in the reservoir 11 is supplied into the cylinder 52 from the supply port 53 a through the upstream portion 33 a of the reserve pump 50 in the second pipe 33. Since the reserve pump 50 cannot maintain a very low temperature state, the temperature of the LNG supplied into the cylinder 52 rises, and the heated LNG enters the second discharge pipe 34 from the discharge port 53b located at the top of the cylinder 52. Move to the reservoir 11. In the early stage of pre-cooling, only the vaporized gas or a mixture of gas and LNG may enter the second discharge pipe 34 from the discharge port 53b and be discharged to the reservoir 11. Thus, during operation of the main pump 20, the LNG in the reservoir 11 circulates in the order of the upstream portion 33 a of the second pipe 33, the cylinder 52, and the second discharge pipe 34. The pump 50 can be immediately activated.

  When trouble occurs in the main pump 20, that is, when the main pump 20 stops operating, the control device 15 opens the third on-off valve 46 and starts the spare pump 50. Then, by the same operation as that of the main pump 20 described above, the LNG flowing into the cylinder 52 is discharged from the discharge port 53c, and the pressurized LNG is vaporized via the downstream portion 33b of the second pipe 33. The LNG flowing into the carburetor 12 is vaporized by the carburetor 12 and supplied to the engine 13.

  As described above, the marine vessel 1A according to this embodiment includes the auxiliary pump 50 in parallel with the main pump 20 that is normally operated during gas operation. Generally, spare equipment is installed without being operated so that there is no trouble in operation when trouble occurs in equipment that is used regularly. For this reason, even if a spare pump is provided separately from the main pump in the ship, it is normal for the liquefied gas to circulate through the spare pump in preparation for operation without any trouble in the main pump. Because it is an act that assumes However, in the ship 1A according to this embodiment, when the main pump 20 is in operation, the first on-off valve 44 and the second on-off valve 45 are opened, and the LNG of the reservoir 11 is connected to the upstream portion 33a of the second pipe 33, the cylinder 52 and the second exhaust pipe 34 are circulated in this order, so that the preliminary pump 50 can be precooled while the gas operation is being performed by the main pump 20. For this reason, when trouble occurs in the main pump 20, the spare pump 50 can be operated immediately, and as a result, the gas operation can be continued without switching to the oil operation.

  Further, in the ship 1A according to this embodiment, when the main pump 20 is in operation, the LNG supplied into the cylinder is returned to the reservoir 11 via the second discharge pipe 34 connected to the reservoir 11, A decrease in LNG in the reservoir 11 due to the pre-cooling of the pump 50 can be suppressed.

  Furthermore, in the marine vessel 1A according to this embodiment, when the first on-off valve 44 and the second on-off valve 45 are closed when the main pump 20 is not in operation, LNG does not flow through the second pipe 33 and the second discharge pipe 34. The cooling of the preliminary pump 50 can be stopped. Further, since LNG does not flow through the second pipe 33 and the second discharge pipe 34, heat input to the reservoir 11 through the second discharge pipe 34 when the main pump 20 is not in operation can be prevented.

  In the above embodiment, when the main pump 20 is in operation and the auxiliary pump 50 is not in operation, the cylinder 52 of the auxiliary pump 50 is cooled, but the LNG supplied from the reservoir 11 into the cylinder 52 is reduced. The spare pump 50 may be operated at the minimum number of revolutions when the main pump 20 is operated so as to be discharged from the cylinder 52 to the reservoir 11.

Second Embodiment
Next, with reference to FIG. 2, the ship 1B which concerns on 2nd Embodiment of this invention is demonstrated. In the gas supply system 10B of the ship 1B according to this embodiment, in addition to the configuration of the first embodiment, a first discharge pump 61 is provided in the upstream portion 31a of the main pump 20 in the first pipe 31. A second discharge pump 62 is provided in the upstream portion 33 a of the preliminary pump 50 in the second pipe 33. The first discharge pump 61 may be upstream or downstream of the first on-off valve 41, and the second discharge pump 62 may be upstream or downstream of the first on-off valve 44. Moreover, in 2nd Embodiment, unlike 1st Embodiment, the upstream part 33a and the 2nd discharge piping 34 of the preliminary | backup pump 50 in the 2nd piping 33 are comprised so that LNG may flow into the storage device 11 by natural convection. There is no need to be. For this reason, in FIG. 2, although it does not show so that it may incline upwards as it goes to the storage device 11 from the discharge port 53b, the 2nd discharge piping 34 of 2nd Embodiment is also the structure similar to 1st Embodiment. There may be. The first discharge pump 61 and the second discharge pump 62 may be inside or outside the reservoir 11.

  In this embodiment, immediately before the main pump 20 is operated and when the inside of the cylinder 22 of the main pump 20 is cooled, the operation of the first discharge pump 61 is started, and when the operation of the main pump 20 is started, the second The operation of the discharge pump 62 is started, and the other control is the same as in the first embodiment. This embodiment differs from the first embodiment in that the LNG of the reservoir 11 is forcibly moved in the order of the upstream portion 33a of the second pipe 33, the cylinder 52, and the second discharge pipe 34 by the second discharge pump 62. Circulate.

  Also in this embodiment, the same effect as the first embodiment can be obtained. Moreover, according to this embodiment, it depends on the shape and arrangement of the reservoir 11, the upstream portion 33a of the reserve pump 50 in the second pipe 33, the cylinder 52, the second discharge pipe 34, the supply port 53a, and the discharge port 53b. Instead, LNG can be flowed from the cylinder 52 to the reservoir 11 by the second discharge pump 62.

  In this embodiment, the first discharge pump 61 is provided in the first pipe 31, and the second discharge pump 62 is provided in the second pipe 33. However, as a modification, the first pipe 31 and the second pipe are provided. 33 may have a portion common to the upstream side, and a common discharge pump may be provided in the common portion. In this case, when the inside of the cylinder 22 of the main pump 20 is cooled immediately before the main pump 20 is operated, the operation of the common discharge pump is started, and the main pump 20 and the spare pump 50 are simultaneously cooled. Begin to be. Even in this modification, the same effects as those of the second embodiment can be obtained.

<Third Embodiment>
Next, a ship 1C according to a third embodiment of the present invention will be described with reference to FIG. The ship 1C according to this embodiment includes a gas consumer 73 that consumes gas, and a low-pressure fuel supply pipe 80 that connects the reservoir 11 and the gas consumer 73 in addition to the configuration of the first embodiment. The low-pressure fuel supply pipe 80 is provided with a low-pressure pump 71 that supplies LNG from the reservoir 11 to the gas consumer 73 and a low-pressure gas vaporizer 72 that heats and vaporizes the LNG in this order from the upstream side. Yes. The low-pressure fuel supply pipe 80 includes an upstream portion 81 that is a portion between the reservoir 11 and the low-pressure pump 71, an intermediate portion 82 that is a portion between the low-pressure pump 71 and the low-pressure gas carburetor 72, and a low pressure A downstream portion 83 which is a portion between the gas vaporizer 72 and the gas consumer 73 is included. The gas consumer 73 is, for example, a power generation gas engine or a boiler.

  Further, the ship 1C according to this embodiment includes an upstream portion 81 of the low-pressure fuel supply pipe 80, a cylinder 52 of the reserve pump 50, instead of the second discharge pipe 34 and the second on-off valve 45 according to the first embodiment. And a second on-off valve 92 provided on the second discharge pipe 91. However, also in this embodiment and a ship according to a fourth embodiment to be described later, the second discharge pipe 34 and the second on-off valve 45 according to the first embodiment may be separately provided.

  In this embodiment, when the main pump 20 is in operation, the control device 15 opens the second on-off valve 92 provided in the second discharge pipe 91, and the other controls are the same as in the first embodiment. During operation of the main pump 20, the LNG in the reservoir 11 is supplied to the low pressure pump 71 through the upstream portion 33 a of the second pipe 33, the cylinder 52 and the second discharge pipe 91 by the low pressure pump 71 in operation. Thereafter, the gas flows into the low pressure gas carburetor 72 through the intermediate portion 82 of the low pressure fuel supply pipe 80. The gas vaporized by the low pressure gas vaporizer 72 is consumed by the gas consumer 73.

  In this embodiment, when a trouble occurs in the main pump 20, that is, when the main pump 20 stops operating, the control device 15 closes the second on-off valve 92 provided in the second discharge pipe 91. The third on-off valve 46 provided in the downstream portion 33b of the preliminary pump 50 in the second pipe 33 is opened, and the preliminary pump 50 starts operating. Thereafter, high-pressure gas is supplied to the engine 13 through the same process as in the first embodiment. On the other hand, when the standby pump 50 is in operation, the low pressure pump 71 is supplied with LNG from the reservoir 11 via the upstream portion 81 of the low pressure fuel supply pipe 80.

  Also in this embodiment, the same effect as the first embodiment can be obtained. Moreover, according to this embodiment, LNG to be consumed by the gas consumer 73 can be reasonably precooled. When the cylinder 52 of the preliminary pump 50 is cooled, the heated LNG or gas is not returned from the cylinder 52 to the reservoir 11, so there is no heat input to the reservoir 11 due to cooling in the cylinder 52.

  Note that the second discharge pipe 91 is not necessarily connected to the upstream portion 81 of the low-pressure fuel supply pipe 80. For example, as shown in FIG. 4, the second discharge pipe 91 may be connected to the intermediate portion 82 of the low-pressure fuel supply pipe 80, and in this case, when the main pump 20 is operated, the spare pump 50 is rotated at the minimum rotational speed. Operate with Even in this case, the same effect as that of the above embodiment can be obtained.

<Fourth embodiment>
Next, with reference to FIG. 5, the ship 1E which concerns on 4th Embodiment of this invention is demonstrated. In addition to the configuration of the third embodiment, the ship 1E according to this embodiment is provided with an introduction pipe 93 that leads LNG from an intermediate portion 82 of the low-pressure fuel supply pipe 80 into the cylinder 52 of the reserve pump 50, and an introduction pipe 93. The on-off valve 94 is provided.

  In this embodiment, at the start of operation of the main pump 20, the control device 15 is provided in the introduction pipe 93 instead of opening the first on-off valve 44 provided in the upstream portion 33 a of the preliminary pump 50 in the second pipe 33. The opened on-off valve 94 is opened, and the other controls are the same as in the third embodiment. During operation of the main pump 20, the LNG in the reservoir 11 is supplied to the low-pressure pump 71 via the upstream portion 81 of the low-pressure fuel supply pipe 80 by the low-pressure pump 71 in operation. It flows into the low-pressure gas vaporizer 72 through the intermediate portion 82. A part of the LNG discharged from the low pressure pump 71 circulates in the order of the introduction pipe 93, the cylinder 52, and the second discharge pipe 91, and returns to the upstream portion 81 of the low pressure fuel supply pipe 80.

  In this embodiment, when trouble occurs in the main pump 20, that is, when the main pump 20 stops operating, the control device 15 causes the second on-off valve 92 and the introduction pipe provided in the second discharge pipe 91. The on-off valve 94 provided at 93 is closed, the third on-off valve 46 provided at the downstream portion 33b of the auxiliary pump 50 in the second pipe 33 is opened, and the auxiliary pump 50 starts operating. Thereafter, high-pressure gas is supplied to the engine 13 through the same process as in the first embodiment. On the other hand, when the standby pump 50 is in operation, the low pressure pump 71 is supplied with LNG from the reservoir 11 via the upstream portion 81 of the low pressure fuel supply pipe 80.

  Also in this embodiment, the same effect as that of the third embodiment can be obtained.

<Fifth Embodiment>
Next, with reference to FIG. 6, the ship 1F which concerns on 5th Embodiment of this invention is demonstrated. In the ship 1F according to this embodiment, the ship 1A according to the first embodiment uses a main pump 20 that is a high-pressure pump as a main booster, whereas a high-pressure compressor 100 is used as a main booster. It differs greatly in that it is.

  The gas supply system 10F according to this embodiment includes a reservoir 11 that stores LNG, a first pipe 102 that connects the reservoir 11 to the engine 13, and an evaporative gas that is provided in the first pipe 102 and in which LNG has evaporated. A high-pressure compressor 100 for increasing the pressure is provided. In addition, the gas supply system 10F includes a second pipe 33 that leads from the reservoir 11 to the downstream portion 102d of the high-pressure compressor 100 in the first pipe 102, and is similar to the gas supply system 10A according to the first embodiment. The auxiliary pump 50 provided in the piping 33 and the vaporizer 12 provided in the downstream part of the auxiliary pump 50 in the second piping 33 are further provided.

  In this embodiment, in the first pipe 102, one flow path is divided into two flow paths from the downstream side toward the upstream side. More specifically, in the first pipe 102, the first branch 102a for extracting the boil-off gas in the reservoir 11, and the low-pressure pump 106 and the vaporizer 108 for extracting the liquefied gas in the reservoir 11 are upstream. To a second branch path 102b provided in this order, and a common path 102c where the first and second branch paths 102a and 102b merge. That is, the first pipe 102 guides the gas vaporized in the reservoir 11 and the gas forcedly vaporized by the vaporizer 108 to the high-pressure compressor 100, and guides the gas pressurized by the high-pressure compressor 100 to the engine 13. Although illustration is omitted, each of the first and second branch passages 102a and 102b is provided with a flow control valve, and the degree of opening of these flow control valves depends on the amount of boil-off gas generated in the reservoir 11. Adjusted. The first pipe 102 may have only one of the first branch path 102a and the second branch path 102b.

  The pre-pump 50 is pre-cooled by the same operation as in the first embodiment when the high-pressure compressor 100 is in operation so that the pre-pump 50 can be started immediately when trouble occurs in the high-pressure compressor 100. Has been. When trouble occurs in the high-pressure compressor 100, that is, when the high-pressure compressor 100 stops operating, the control device 15 causes the downstream portion 33b of the preliminary pump 50 in the second pipe 33 to be the same as in the first embodiment. The third on-off valve 46 provided in is opened, and the preliminary pump 50 is activated. The LNG boosted by the preliminary pump 50 flows into the carburetor 12 of the second pipe 33, and the LNG that flows into the carburetor 12 is vaporized by the carburetor 12 and supplied to the engine 13.

  Generally, as a spare device, a device having the same configuration as that of a commonly used device is provided. Therefore, when a spare booster is provided on a ship having a high-pressure compressor as a main booster, a spare high-pressure compressor is used. It is normal to think about preparing. However, in the ship 1F according to this embodiment, the auxiliary pump 50 is provided in parallel with the high-pressure compressor 100 that is normally operated during gas operation, and the high-pressure pump is smaller in size than the high-pressure compressor. It is easy to secure the installation space for the booster. Further, since the high-pressure pump can boost the fuel to a desired pressure in a shorter time than the high-pressure compressor, when there is a problem with the high-pressure compressor 100 that is the main booster, the high-pressure gas is immediately generated by the spare pump 50. Can be supplied, and gas operation can be continued. Further, the preliminary pump 50 cannot be operated immediately unless it is sufficiently precooled. However, the ship 1F according to this embodiment is operated by the high-pressure compressor 100 in the same manner as the ship 1A according to the first embodiment. The pre-pump 50 can be pre-cooled while it is being performed. For this reason, when trouble occurs in the high-pressure compressor 100, the preliminary pump 50 can be operated immediately, and as a result, the gas operation can be continued without switching to the oil operation.

  Also in the second to fourth embodiments, as in the fifth embodiment, the high-pressure compressor 100 may be used as a main boosting device instead of the main pump 20. Also in this case, the same effect as the second to fourth embodiments can be obtained.

<Other embodiments>
The above-described embodiment is an example in all respects, and should be considered not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. For example, the opening / closing timing of each on-off valve is not limited to that described in the above embodiment.

In the above embodiment, the main pump and the spare pump have a plurality of pistons and a plurality of cylinders. However, the present invention is not limited to this and may have one piston and one cylinder. In the above embodiment, the main pump and the spare pump are described as having the same configuration. However, the present invention is not limited to this, and a different configuration may be used. The ship which concerns on the said embodiment is not limited to a LNG carrier ship, A ship of other uses, such as a LNG fuel ship, may be sufficient, and a reservoir may be a tank only for fuel instead of a transport tank. In the above embodiments, the liquefied gas is not limited to LNG, it may be a LPG and LH _2. Moreover, in the said embodiment, a diesel engine is not limited to a 2-cycle engine, A 4-cycle engine may be sufficient, and engines other than the main engine for propulsion may be sufficient, for example, it may be a power generation engine. Good.

  The present invention can be applied to a ship equipped with a dual fuel diesel engine that uses gas and oil vaporized from liquefied gas as fuel.

1A to 1F Ship 10A to 10F Gas supply system 11 Reservoir 12, 72 Vaporizer 13 Engine 15 Control device 16 Oil supply system 20 Main pump 21, 51 Piston 22, 52 Cylinder 31, 102 First piping 32 First discharge piping 33 Second piping 34, 91 Second exhaust piping 41, 44 First on-off valve 42, 45 Second on-off valve 50 Preliminary pump 61 First exhaust pump 62 Second exhaust pump 73 Gas consumer 80 Low-pressure fuel supply piping 100 High pressure compressor

Claims (9)

A reservoir for storing liquefied gas;
A vaporizer for vaporizing the liquefied gas;
A dual fuel diesel engine using gas and oil vaporized from the liquefied gas as fuel;
A first pipe for guiding liquefied gas from the reservoir to the vaporizer;
A main pump provided in the first pipe for boosting the liquefied gas;
A second pipe connected from the reservoir to a downstream side portion of the main pump in the first pipe;
A reserve pump that is a reciprocating pump provided in the second pipe and including a cylinder and a piston that reciprocates in the cylinder;
And a discharge pipe configured to discharge the liquefied gas supplied from the reservoir into the cylinder when the main pump is in operation.   The discharge pipe is connected to the reservoir, and when the main pump is operated, the liquefied gas supplied from the reservoir through the second pipe into the cylinder flows from the cylinder to the reservoir. The marine vessel of claim 1 configured. A first on-off valve provided in an upstream portion of the preliminary pump in the second pipe, and a second on-off valve provided in the discharge pipe;
The marine vessel according to claim 1 or 2, wherein the first on-off valve and the second on-off valve are closed when the main pump is not in operation and are opened when the main pump is in operation. A reservoir for storing liquefied gas;
A dual fuel diesel engine using gas and oil vaporized from the liquefied gas as fuel;
A first pipe connected from the reservoir to the dual fuel diesel engine;
A high-pressure compressor provided in the first pipe for increasing the pressure of the evaporated gas from which the liquefied gas has evaporated;
A second pipe connected from the reservoir to the downstream side portion of the high-pressure compressor in the first pipe;
A reserve pump that is a reciprocating pump provided in the second pipe and including a cylinder and a piston that reciprocates in the cylinder;
And a vaporizer provided in a downstream portion of the second pump in the second pipe for vaporizing the liquefied gas pressurized by the preliminary pump.   The marine vessel according to claim 4, further comprising a discharge pipe configured to discharge the liquefied gas supplied from the reservoir into the cylinder when the high-pressure compressor is in operation.   The ship according to claim 2 or 5, wherein the discharge pipe is connected to the reservoir, and is arranged to be inclined upward as it goes from the cylinder to the reservoir.   The discharge pipe is configured such that the liquefied gas supplied from the reservoir through the second pipe into the cylinder is discharged by a discharge pump provided in an upstream portion of the reserve pump in the second pipe. The ship according to any one of claims 1 to 3, 5, and 6 configured to be discharged from a ship. A device that consumes the vaporized gas of the liquefied gas;
A low-pressure fuel supply pipe connecting the reservoir and the device;
A vaporizer different from the vaporizer provided in the low-pressure fuel supply pipe;
The discharge pipe is connected to the low-pressure fuel supply pipe on the upstream side of the another vaporizer, and the liquefied gas supplied from the reservoir into the cylinder is operated from the cylinder when the main pump is in operation. arranged to be discharged to the supply pipe, vessel according to claim 1. The ship according to any one of claims 1 to 8, wherein the reservoir is a suction drum.

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