WO2017183510A1 - Liquefied natural gas vaporizer, natural gas fuel supply system provided with same, and method for operating natural gas fuel supply system - Google Patents

Liquefied natural gas vaporizer, natural gas fuel supply system provided with same, and method for operating natural gas fuel supply system Download PDF

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Publication number
WO2017183510A1
WO2017183510A1 PCT/JP2017/014761 JP2017014761W WO2017183510A1 WO 2017183510 A1 WO2017183510 A1 WO 2017183510A1 JP 2017014761 W JP2017014761 W JP 2017014761W WO 2017183510 A1 WO2017183510 A1 WO 2017183510A1
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Prior art keywords
natural gas
heat
heating
heat medium
vaporizer
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PCT/JP2017/014761
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French (fr)
Japanese (ja)
Inventor
学 大辻
春名　一生
Original Assignee
住友精化株式会社
サノヤス造船株式会社
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Application filed by 住友精化株式会社, サノヤス造船株式会社 filed Critical 住友精化株式会社
Priority to JP2018513121A priority Critical patent/JPWO2017183510A1/en
Publication of WO2017183510A1 publication Critical patent/WO2017183510A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation

Definitions

  • the present invention relates to a liquefied natural gas vaporizer configured to heat and vaporize liquefied natural gas with a liquid heat medium, and to recover the exhaust heat of a marine engine driven with the vaporized gas as fuel. And a natural gas fuel supply system including the same.
  • the invention further relates to a method of operating a natural gas fuel supply system.
  • LNG is stored in an LNG storage tank at a low temperature of ⁇ 160 ° C. or lower, heated by a vaporizer or the like, evaporated and vaporized, and used as fuel.
  • a heat source for the vaporizer various materials can be used according to the physical properties of the gas. Recently, hot water (liquid heat medium) has been used in addition to air and seawater.
  • a warm water type LNG vaporizer using warm water in a vaporizer for liquefied natural gas is disclosed in, for example, Japanese Patent Application Laid-Open No. 2012-229860 (Patent Document 1).
  • a heat transfer tube is provided inside a shell (heat medium container).
  • LNG low temperature liquid
  • the temperature of warm water as a heating source can be adjusted by using a warm water boiler or the like.
  • JP-A-2015-147508 Patent Document 2
  • the exhaust heat of the internal combustion engine (engine) is recovered in cooling water (warm water) and circulated and transferred to a hot water vaporizer as a heating source.
  • a device for producing hot water such as a hot water boiler is no longer required, which saves energy and is an effective measure for preventing global warming by reducing carbon dioxide emissions including the engine.
  • the heater is installed in the cooling water (hot water) circulation line, the circulating cooling water (hot water) will not be sent to the vaporizer unless the hot water pump is operating. Even if the hot water pump is operating, it takes time to increase the overall temperature of the cooling water (hot water) heated by the heater. Therefore, even if a heater is provided in the cooling water (warm water) circulation line, only the amount corresponding to the amount of circulating coolant (warm water) can be heated, and before starting the internal combustion engine (engine), LNG vaporization at start-up The amount of heat corresponding to the amount cannot be applied sufficiently.
  • the present invention has been conceived under such circumstances, and is a vaporization for liquefied natural gas configured to recover the exhaust heat of a marine engine driven by natural gas as a fuel by a liquid heat medium.
  • the main object of the present invention is to provide a carburetor suitable for quickly supplying natural gas fuel to a marine engine when restarting after the engine is stopped.
  • a vaporizer for recovering exhaust heat of a combustion device driven by natural gas as a fuel by a liquid heat medium and heating and vaporizing the liquefied natural gas with the liquid heat medium.
  • the liquefied natural gas vaporizer is installed in the heat medium container in which the liquid heat medium can be replenished, a heat transfer pipe disposed inside the heat medium container, through which the liquefied natural gas flows, and attached to the heat medium container. And a heating means for heating the liquid heat medium inside the heat medium container.
  • the heating means is configured to adjust the heating of the liquid heat medium inside the heat medium container at a heating rate equal to or greater than the amount of heat dissipated to the outside when the combustion apparatus is stopped. .
  • the heating means is configured to operate at least during a part of time when the combustion apparatus is stopped.
  • the heating means includes a sheath heater.
  • the heating means includes a temperature detection unit that detects the temperature of the liquid heat medium inside the heating medium container, a power supply unit that controls the operation of the sheath heater according to a detection result by the temperature detection unit, including.
  • the heating means includes an auto trace heater.
  • the heating means measures the temperature of the power supply unit for supplying power to the auto trace heater and the outer surface of the heating medium container, and turns on the power supply by the power supply unit according to the measured temperature.
  • a temperature adjusting unit that controls the off-state.
  • the auto trace heater is configured to adjust the heating of the liquid heat medium inside the heat medium container at a heating rate equal to or greater than the amount of heat dissipated to the outside while self-controlling the heat generation amount. .
  • a natural gas fuel supply system includes a marine engine as a combustion device, an LNG storage tank for storing liquefied natural gas, the liquefied natural gas vaporizer according to the first aspect of the present invention, and the marine engine.
  • a heat recovery part for recovering exhaust heat with the liquid heat medium, a heat medium line for circulating the liquid heat medium between the heat recovery part and the vaporizer, and the LNG storage tank via the heat transfer pipe
  • And piping for supplying the vaporized natural gas to the marine engine.
  • the heating means is configured to adjust the heating of the liquid heat medium inside the heat medium container at a heating rate equal to or greater than the amount of heat dissipated to the outside when the marine engine is stopped. Yes.
  • the heat medium container includes a second heat transfer tube provided therein separately from the heat transfer tube, and the second heat transfer tube is vaporized into the LNG storage tank via an additional pipe. A part of the natural gas is supplied back to adjust the internal pressure of the LNG storage tank.
  • the third aspect of the present invention there is provided a method of operating the natural gas fuel supply system according to the second aspect of the present invention.
  • heating by the heating device is stopped during operation of the marine engine, and heating by the heating device is performed while the marine engine is stopped.
  • the fourth aspect of the present invention there is provided a method for operating the natural gas fuel supply system according to the second aspect of the present invention.
  • the method when the liquid heat medium in the heat medium container is at a predetermined temperature or higher, heating by the heating device is stopped, and when the liquid heat medium in the heat medium container falls below the predetermined temperature, the heating is performed. Heat by the device.
  • FIG. 1 shows a first embodiment of a natural gas fuel supply system according to the present invention.
  • the natural gas fuel supply system X1 of this embodiment includes an LNG storage tank 1, a vaporizer 2, a buffer tank 3, an engine jacket 4, and lines connected to these.
  • the natural gas fuel supply system X1 is for supplying natural gas as fuel gas to the marine engine 5 as a combustion device, for example, and is mounted on, for example, the bottom of the ship.
  • the LNG storage tank 1 is for storing liquefied natural gas (LNG) as fuel.
  • the LNG storage tank 1 includes an outer tank 11 and an inner tank 12, and a heat insulating material (not shown) is filled between the outer tank 11 and the inner tank 12, and the vacuum heat insulating layer 13 is evacuated to a vacuum. It has a structure that shuts off.
  • LNG is stored at a temperature of ⁇ 160 ° C. or lower.
  • the LNG storage tank 1 receives natural gas, which has been pressurized by LNG vaporized in the vaporizer 2, through the gas line 67 at a pressure of 1 MPaG or less.
  • the LNG supply line 61 is connected to the lower part of the LNG storage tank 1.
  • the LNG supply line 61 is a flow path for transferring LNG delivered from the LNG storage tank 1 to the vaporizer 2.
  • the LNG supply line 61 is provided with a cutoff valve 611.
  • the vaporizer 2 is for evaporating and vaporizing LNG using a liquid heat medium as a heating source.
  • the vaporizer 2 includes a heat medium container 21 and heat transfer tubes 22 and 23 disposed inside the heat medium container 21.
  • the heat medium container 21 is a sealed container for accommodating a liquid heat medium.
  • the heat medium container 21 accommodates a liquid heat medium for heating and vaporizing the LNG in the heat transfer tube 22.
  • Examples of the liquid heat medium include warm water.
  • the heat medium container 21 has a structure in which a substantially bell-shaped container body 212 is mounted on a bottom plate 211 having a flange structure, and the container body 212 and the bottom plate 211 are integrated with a bolt with a gasket interposed therebetween. Fixed.
  • the container body 212 can be connected to an LNG pipe (LNG supply line 61) or hot water pipe (heat to be described later) by removing hot water (liquid heating medium) and removing the bolts.
  • the medium lines 62, 63, etc.) can be easily pulled up without removing the medium lines 62, 63, etc., and the heat transfer tubes 22, 23 can be directly inspected.
  • Heat medium lines 62 and 63 are connected to the heat medium container 21.
  • the heat medium lines 62 and 63 are for circulating hot water between the vaporizer 2 and the engine jacket 4.
  • the heat medium line 62 is connected to the lower part (bottom plate 211) of the heat medium container 21, and hot water that has passed through the engine jacket 4 (heat recovery unit) is introduced into the heat medium container 21 through the heat medium line 62. .
  • the heat medium line 63 is connected to the lower part (bottom plate 211) of the heat medium container 21 and is connected to the overflow pipe 24 that penetrates the bottom plate 211 in a sealed state.
  • the hot water that has passed through the inside of the heat medium container 21 by being sequentially supplied via the heat medium line 62 is discharged to the heat medium line 63 via the overflow pipe 24.
  • the heat medium line 63 is provided with a circulation pump 631. Although details will be described later, the hot water discharged from the heat medium container 21 is reheated in the engine jacket 4, supplied again to the vaporizer 2 (
  • the heat transfer tube 22 is a flow path through which LNG introduced into the heat medium container 21 flows, and is wound, for example, in a coil shape.
  • the upstream end of the heat transfer tube 22 passes through the lower part (bottom plate 211) of the heat medium container 21 and is connected to the LNG supply line 61.
  • a gas line 64 is also connected to the lower part (bottom plate 211) of the heat medium container 21.
  • the downstream end of the heat transfer tube 22 passes through the bottom plate 211 and is connected to the gas line 64.
  • the LNG in the heat transfer tube 22 is heated and vaporized by the surrounding warm water, and the vaporized natural gas is discharged to the gas line 64 that leads to the outside of the heat medium container 21.
  • a buffer tank 3 is provided at the downstream end of the gas line 64.
  • the natural gas vaporized in the heat transfer tube 22 is sent to the buffer tank 3 through the gas line 64.
  • the gas line 64 is provided with a shutoff valve 641.
  • the use temperature of the hot water is, for example, 20 to 80 ° C., preferably 40 to 60 ° C.
  • the natural gas vaporized in the heat transfer tube 22 is heated to, for example, a temperature of 20 ° C. or higher and discharged at a pressure of about 0.70 MPaG.
  • the heat transfer tube 23 is a flow path through which LNG introduced into the heat medium container 21 flows, and is wound, for example, in a coil shape.
  • the heat transfer tube 23 is for increasing the pressure in the space portion inside the LNG storage tank 1 by the vaporized natural gas.
  • the upstream end of the heat transfer tube 23 passes through the lower part (bottom plate 211) of the heat medium container 21 and is connected to the LNG supply line 66.
  • the LNG supply line 66 is branched in the middle of the LNG supply line 61.
  • the LNG supply line 66 is provided with a shutoff valve 661.
  • a gas line 67 is also connected to the lower part (bottom plate 211) of the heat medium container 21.
  • the downstream end of the heat transfer tube 23 passes through the bottom plate 211 and is connected to the gas line 67.
  • the gas line 67 is provided with a pressure control valve 671.
  • the natural gas vaporized in the heat transfer tube 23 is sent to the LNG storage tank 1 through the gas line 67.
  • the gas pressure is increased to, for example, 0.75 MPaG.
  • This pressurization pressure becomes the LNG supply pressure from the LNG storage tank 1, and becomes a gas fuel supply pressure source necessary for the marine engine 5 (diesel engine) which is an internal combustion engine.
  • the heat medium container 21 (container body 212) is provided with a sheath heater 25.
  • the sheath heater 25 is installed in the lower part of the side surface of the container body 212 and operates by receiving power supply from the power supply unit 26.
  • FIG. 2 shows an example of a state in which the sheath heater 25 is attached to the heat medium container 21.
  • the sheath heater 25 has a structure in which a nichrome wire is covered with an insulating powder of magnesium oxide and housed in a metal pipe serving as a sheath.
  • the sheath heater 25 is connected to a nichrome wire that becomes a heating element from an electric cable in the cap 251, and is immersed in the hot water in the heating medium container 21.
  • the flange 252 of the sheath heater 25 is fixed to the flange 213 of the container body 212 by bolt fastening in a state where a gasket is sandwiched.
  • the heat medium container 21 (container body 212) is also provided with a temperature detection unit 27.
  • the temperature detection unit 27 detects the temperature of the hot water using a temperature measurement unit introduced into the heat medium container 21.
  • the power supply unit 26 controls the operation or non-operation of the sheath heater 25 according to the detection result by the temperature detection unit 27. For example, when the marine engine 5 is stopped and the exhaust heat of the marine engine 5 due to the hot water is no longer recovered from the engine jacket 4, the heat medium container 21 dissipates heat to prevent the hot water temperature from decreasing.
  • the sheath heater 25 is operated so as to supply a heat amount corresponding to the heat amount.
  • the sheath heater 25, the power supply unit 26, and the temperature detection unit 27 constitute a heating unit.
  • the heat insulating material 28 is attached to the outer surface of the container body 212.
  • rock wool is used as the heat insulating material 28, and the rock wool covers the surface of the container body 212 with a thickness of about 50 mm.
  • the buffer tank 3 is a sealed container that can store natural gas.
  • the buffer tank 3 is used to absorb the load fluctuation of the consumption gas amount of the subsequent combustion device (the marine engine 5) for the natural gas fuel fed through the gas line 64.
  • the combustion apparatus is an internal combustion engine, a configuration in which natural gas is stored by the buffer tank 3 is effective.
  • a gas line 65 is connected to the buffer tank 3.
  • the gas line 65 is provided with a pressure control valve 651.
  • the natural gas that has passed through the gas line 65 is supplied to the marine engine 5.
  • the marine engine 5 is, for example, a 6-cylinder dual fuel diesel engine. In FIG. 1, only one cylinder of the marine engine 5 is schematically shown.
  • the marine engine 5 includes a cylinder 51 that is a main combustion chamber, and a sub-combustion chamber 52.
  • a pilot liquid fuel injection port is provided in the sub-combustion chamber 52, and pilot liquid fuel such as heavy oil or light oil is injected and injected, ignited and burned, and enters the cylinder 51.
  • the cylinder 51 is provided with an intake port 511 and an exhaust port 512. Natural gas (fuel) and air sent from the gas line 65 through the pressure control valve 651 are premixed in the intake port 511, and the mixed gas flows into the cylinder 51 at a pressure of 0.70 MPaG or less, for example. Combustion explosion occurs in the cylinder 51. The power generated at this time becomes the ship drive energy that displaces the piston 53 and rotates the crank 54 while turning the screw (not shown) through the shaft.
  • the engine jacket 4 is for recovering the exhaust heat of the marine engine 5 with hot water, and is provided on the outer periphery of the cylinder 51.
  • the engine jacket 4 is connected to the downstream end of the heat medium line 63 and the upstream end of the heat medium line 62.
  • the hot water introduced into the engine jacket 4 through the heat medium line 63 passes through the engine jacket 4 and is sent out to the heat medium line 62.
  • the hot water passing through the engine jacket 4 collects combustion exhaust heat of the marine engine 5 while cooling the cylinder 51.
  • the temperature of the hot water rises, for example, by about 5 to 10 ° C. by passing through the engine jacket 4.
  • the size of the natural gas fuel supply system X1 generally varies depending on the size of the ship (fuel consumption) on which the natural gas fuel supply system X1 is mounted, and the capacity of the heat medium container 21 in the vaporizer 2 is also It depends on the size of the ship.
  • the marine engine 5 in the marine vessel is, for example, a 6-cylinder dual fuel diesel engine and the output is 1,500 kw
  • the supply amount of natural gas fuel required for driving the engine is in the range of 70 kg / h to 400 kg / h.
  • the diameter of the cylindrical heating medium container 21 for heating the heat transfer tube 22 is about 1.2 m and the height is about 1 m to 2 m.
  • the capacity of the heat medium container 21 is in the range of about 1 m 3 to 2 m 3 .
  • the warm water circulating in the carburetor 2, the engine jacket 4, and the heat medium lines 62 and 63 is heated by the exhaust heat recovery of the marine engine 5 in the engine jacket 4 and sent to the heat medium container 21 through the heat medium line 62. It is.
  • the temperature of the hot water is increased to, for example, about 60 ° C. by exhaust heat recovery, and the heated hot water is LNG while colliding with the coiled heat transfer tubes 22 and 23 in the cylindrical heat medium container 21. Is vaporized and evaporated into natural gas, and the natural gas is further heated to 20 ° C. or higher.
  • the hot water becomes about 55 ° C. due to a temperature drop of about 5 ° C., is discharged to the heat medium line 63 through the overflow pipe 24, is pressurized again by the circulation pump 631, and then returned to the engine jacket 4. .
  • the heating amount required to vaporize LNG of ⁇ 160 ° C. with hot water to become natural gas of 20 ° C. is about 88,500 kcal / h in winter.
  • the amount of heat dissipated in the vaporizer 2 varies depending on the temperature in the cabin.
  • the amount of heat dissipated from the heat medium container 21 to which the heat insulating material 28 is applied is, for example, about 1,300 kcal / h when the cabin temperature is 5 ° C. in winter, and about when the cabin temperature is 45 ° C. in summer. 370 kcal / h. From the above, it can be seen that the amount of heat dissipated in the heat medium container 21 is only about 0.4% to 1.5% of the total heating amount.
  • the vaporizer 2 has a cylindrical bowl shape and a large internal volume, and the coiled heat transfer tube 22 is immersed in a heat medium container 21 filled with warm water. That is, the LNG is vaporized collectively without dividing the vaporizer 2 into a plurality of units. As a result, more hot water stays in the heat medium container 21 than in the circulation lines (heat medium lines 62 and 63). For example, the amount of hot water in the heat medium container 21 is about 30 times the amount of hot water in the heat medium lines 62 and 63, and the heat medium container 21 has a large amount of hot water.
  • the heat medium container 21 has a relatively small outer surface area for its capacity, and it is difficult to dissipate heat if it is kept warm. Therefore, when the marine engine 5 stops and exhaust heat recovery stops or the flow of hot water stops, if the vaporizer 2 is replenished with the same amount of heat as the amount of heat dissipated, the temperature drop of the hot water can be suppressed. . As a result, liquefied natural gas (LNG) can be vaporized and raised to a necessary gas temperature at any time, and the natural gas necessary for restarting the marine engine 5 can be quickly supplied.
  • LNG liquefied natural gas
  • a heat amount corresponding to the amount of heat dissipated from the surface of the heat medium container 21 is added to the heat medium container 21 when the marine engine 5 is stopped. If it does, even if the marine engine 5 stops and the hot water circulation stops, natural gas can be vaporized and supplied at a required temperature (for example, 20 ° C. or more in the case of a diesel engine).
  • a sheath heater 25 is provided in the heat medium container 21 in order to apply heat to the heat medium container 21 when the marine engine 5 is stopped.
  • the sheath heater 25 has a small heating capacity of about 1 to 2 kW and can be freely shaped, so that it is next to the coiled heat transfer tubes 22 and 23 in the heat medium container 21 and near the lower part of the heat medium container 21. If it attaches to, the hot water in the heat-medium container 21 will convect appropriately. If the above measures are taken, the amount of heat released from the heat medium container 21 when the marine engine 5 is stopped decreases, and as a result, a small amount of heating is required. For this reason, when the marine engine 5 is stopped, it is advantageous from the viewpoint of simplicity and efficiency of equipment to provide an electric sheath heater 25 instead of using steam or a heat medium for heating.
  • the heat medium container 21 is provided with a temperature detection unit 27, and the power supply unit 26 controls the operation of the sheath heater 25 according to the temperature of the hot water inside the heat medium container 21 detected by the temperature detection unit 27.
  • the sheath heater 25 controls the operation of the sheath heater 25 according to the temperature of the hot water inside the heat medium container 21 detected by the temperature detection unit 27.
  • the sheath heater 25 heats the hot water at a small heating rate corresponding to the heat radiation from the heat medium container 21 (about 1 to 2 kW), and the heat medium container 21. Because it circulates in the interior, no special operation management is required.
  • the sheath heater 25 When the operation of the sheath heater 25 is controlled using the temperature detection unit 27 as described above, even when a change occurs in the external environment temperature (the cabin temperature) of the heat medium container 21 (vaporizer 2), an amount equivalent to the heat radiation amount is obtained. Since the amount of heat is added, the hot water in the heat medium container 21 can be maintained at a predetermined temperature. For example, in the winter season when the cabin temperature is relatively low, the sheath heater 25 always performs heating when the marine engine 5 is stopped, but in the summer when the cabin temperature is relatively high, the heating medium container 21 Therefore, heating for the purpose of maintaining the temperature by the sheath heater 25 only needs to be performed during a part of the time when the marine engine 5 is stopped. Therefore, according to such a configuration, it is possible to reduce the cost in a standby state in which the marine engine 5 is stopped, rather than separately providing a heater in the cooling water circulation line.
  • FIG. 3 is a schematic configuration diagram showing a second embodiment of the vaporizer for liquefied natural gas according to the present invention.
  • the vaporizer 2 shown in FIG. 3 is provided with an auto trace heater 29, which is different from the vaporizer 2 of the first embodiment shown in FIG.
  • the same or similar elements as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof will be omitted as appropriate.
  • FIG. 4 is a perspective view showing an example of a schematic structure of the auto trace heater 29.
  • the auto trace heater 29 includes a conductive wire 291 made of nichrome wire (nickel and chromium alloy), a heating resistor 292 made of resin containing conductive carbon coated on the outside of the conductive wire 291, and a heating resistor 292. And a non-conductive exterior covering material 293 that covers the outer side.
  • the shape of the entire auto trace heater 29 is usually a belt shape.
  • the heating resistor 292 performs self-control so that electricity flows and generates heat while bridging the conductive wire 291 so that the temperature of the auto trace heater 29 does not increase as the temperature increases, the resistance of the electric flow increases and the amount of generated heat decreases. Has characteristics.
  • the strip-shaped auto trace heater 29 is attached, for example, so that the outer periphery of the container body 212 is spirally wound in a gap portion between the container body 212 and the heat insulating material 28.
  • the required total length of the auto trace heater 29 may be several tens of meters. If the outer diameter of the heat medium container 21 is about 1.2 m, the number of turns of the auto trace heater 29 may be several turns to about 20 turns depending on the height of the heat medium container 21.
  • the maximum amount of heat dissipated in the heat medium container 21 is about 1,300 kcal / h in winter, so that the heating rate of the auto trace heater 29 is 1.5 kw. It is. If the auto trace heater 29 has a capacity of 24 W per meter, the required length of the auto trace heater 29 is 62.5 m. In the heat medium container 21 having an outer diameter of 1.2 m, the auto trace heater 29 is wound. The number is 16.6. In addition, in FIG. 3, the block diagram in case two sets of the auto trace heater 29 are attached was illustrated from a viewpoint of performing construction easily.
  • the temperature sensor 202 for measuring the outer surface temperature of the heat medium container 21 is attached to the surface of the container body 212.
  • the temperature sensor 202 is connected to a thermostat 203, and the thermostat 203 controls on / off of power supply to the auto trace heater 29 by the power supply unit 201 according to the temperature measured by the temperature sensor 202.
  • the above-described auto trace heater 29, power supply unit 201, temperature sensor 202, and thermostat 203 constitute a heating means.
  • the auto trace heater 29 having self-controllability is used as the heating means. For this reason, the excessive temperature rise by the heating of a heating means (auto trace heater 29) can be prevented. Therefore, it can be used safely in a dangerous place where LNG is heated, which is preferable. If the temperature sensor 202 for measuring the surface temperature of the heat medium container 21 and the thermostat 203 are connected and controlled, the temperature controllability is further improved.
  • the auto trace heater 29 does not directly heat the hot water, but adds a quantity of heat corresponding to heat radiation from the hot water to the surface of the container body 212. Thereby, the effect which suppresses the heat dissipation from not only heating but warm water also arises.
  • the heater sheath heater 25 or auto trace heater 29
  • the temperature state of the carburetor 2 when the engine is restarted after the marine engine 5 is stopped will be compared.
  • the capacity of the hot water and 2m 3, natural gas fuel supply amount is set to 400 kg / h.
  • the amount of hot water in the hot water circulation line (heat medium lines 62, 63) is 1 / 30th of the amount of hot water in the heat medium container 21, so if ignored, the engine is always started with a 1.5kw heater. Will be ready.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

[Problem] Provided is a liquefied natural gas vaporizer (2) configured so as to recover the waste heat of a ship engine (5), which is driven with natural gas as fuel, by means of a liquid heat medium. The liquefied natural gas vaporizer (2) is provided with: a heat medium container (21), which is configured to recover waste heat from the ship engine (5) that is driven with natural gas as fuel by means of a liquid heat medium and to heat and vaporize the liquefied natural gas using the liquid heat medium and in which the liquid heat medium is held so that replenishment is possible; a heat transfer pipe (22), which is disposed inside the heat medium container (21) and through which the liquefied natural gas flows; and a heating means (25), which is installed on the heat medium container (21) and is for heating the liquid heat medium inside the heat medium container (21).

Description

液化天然ガス用気化器、およびこれを備えた天然ガス燃料供給システム、並びに、天然ガス燃料供給システムの運転方法Vaporizer for liquefied natural gas, natural gas fuel supply system including the same, and method for operating natural gas fuel supply system
　本発明は、液化天然ガスを液体熱媒で加熱して気化し、当該気化ガスを燃料として駆動する船舶用エンジンの排熱を液体熱媒により回収するように構成された液化天然ガス用気化器、およびこれを備えた天然ガス燃料供給システムに関する。本発明は、さらに天然ガス燃料供給システムの運転方法にも関する。 The present invention relates to a liquefied natural gas vaporizer configured to heat and vaporize liquefied natural gas with a liquid heat medium, and to recover the exhaust heat of a marine engine driven with the vaporized gas as fuel. And a natural gas fuel supply system including the same. The invention further relates to a method of operating a natural gas fuel supply system.
　従来は、各種固形物を乾燥炉で重油、灯油、軽油やプロパンをバーナで燃焼加熱して含有水分を気化蒸発させて用いたり、ボイラでは重油をバーナで燃焼加熱して水蒸気を発生させていた。しかしながら、ＬＮＧ（液化天然ガス）サテライト設備の設置普及が進むことによって、都市を離れた遠隔地でも、燃焼装置の燃料として重油、灯油、軽油やプロパンに代わって天然ガスが使用されるようになってきた。このような天然ガスへの切り替えによって排ガス中の二酸化炭素の排出量を抑え、地球温暖化防止対策ができるようになった。また、内燃機関でも船舶用のディーゼルエンジンの燃料として重油や軽油から天然ガスに切り替えようとされている。具体的には、移動する船舶の内部にＬＮＧサテライト設備に相当する天然ガス燃料供給システムを設置して、ＬＮＧを気化させた天然ガスを重油や軽油の液体燃料と切り替えてエンジンシリンダにて燃焼させることができるデュアルフューエルエンジンが使われるようになっている。 In the past, heavy solids, kerosene, light oil and propane were burned and heated by a burner in a drying furnace to vaporize and evaporate the contained moisture, and boilers burned and heated heavy oil with a burner to generate steam. . However, with the spread of LNG (liquefied natural gas) satellite facilities, natural gas has come to be used in place of heavy oil, kerosene, light oil and propane as fuel for combustion devices even in remote locations away from the city. I came. By switching to such natural gas, the amount of carbon dioxide in the exhaust gas can be suppressed, and global warming prevention measures can be taken. In addition, internal combustion engines are also being switched from heavy oil or light oil to natural gas as fuel for marine diesel engines. Specifically, a natural gas fuel supply system equivalent to an LNG satellite facility is installed inside a moving ship, and natural gas vaporized LNG is switched to liquid fuel such as heavy oil or light oil and burned in an engine cylinder. Dual fuel engines that can do this are now being used.
　これらのＬＮＧサテライト設備あるいは天然ガス燃料供給システムでは、ＬＮＧを－１６０℃以下の低温でＬＮＧ貯槽に蓄え、気化器などで加熱し蒸発気化させてガス状にしてから燃料として使用する。気化器の加熱源としては、ガスの物性に応じて様々なものを使用することができるが、最近では空気や海水に加えて温水（液体熱媒）が使用されるようになっている。 In these LNG satellite facilities or natural gas fuel supply systems, LNG is stored in an LNG storage tank at a low temperature of −160 ° C. or lower, heated by a vaporizer or the like, evaporated and vaporized, and used as fuel. As a heat source for the vaporizer, various materials can be used according to the physical properties of the gas. Recently, hot water (liquid heat medium) has been used in addition to air and seawater.
　液化天然ガス用気化器の中で温水を用いた温水式ＬＮＧ気化器は、例えば特開２０１２－２２９８６０号公報（特許文献１）に開示されている。温水式の気化器においては、シェル（熱媒容器）の内部に伝熱管が設けられている。気化器の稼働時には、シェル側に循環ライン等を用いて温水を流しつつ伝熱管側に－１６０℃近い低温液体（ＬＮＧ）を流す。このような温水式の気化器によれば、加熱源である温水は温水ボイラなどを使用することにより温度調節できる。特許文献１に開示された構成においては、複数の小型の気化器を並列に結合できるようにシェル（熱媒容器）の容量を小さくして、各気化器あたりの温水保有量を少なくしている。したがって、例えば天然ガスの消費先である燃焼装置の停止に伴い温水の流れが停止したときには、熱媒容器の容量に対してそれぞれの気化器の外部表面積が大きいので熱媒容器からの放熱速度が速くなる欠点がある。 A warm water type LNG vaporizer using warm water in a vaporizer for liquefied natural gas is disclosed in, for example, Japanese Patent Application Laid-Open No. 2012-229860 (Patent Document 1). In a hot water vaporizer, a heat transfer tube is provided inside a shell (heat medium container). During operation of the vaporizer, low temperature liquid (LNG) close to −160 ° C. is supplied to the heat transfer tube side while hot water is supplied to the shell side using a circulation line or the like. According to such a warm water type vaporizer, the temperature of warm water as a heating source can be adjusted by using a warm water boiler or the like. In the configuration disclosed in Patent Document 1, the capacity of the shell (heat medium container) is reduced so that a plurality of small vaporizers can be coupled in parallel, and the amount of hot water retained per vaporizer is reduced. . Therefore, for example, when the flow of hot water is stopped with the stop of the combustion apparatus that consumes natural gas, since the external surface area of each vaporizer is larger than the capacity of the heat medium container, the heat dissipation rate from the heat medium container is There is a drawback of being faster.
　一方、船舶用の内燃機関に供される天然ガス燃料供給システムでは、狭い船内に温水ボイラなど余分な設備を設置するのはスペース効率上好ましくないので、例えば特開２０１５－１４７５０８号公報（特許文献２）に開示されているように、内燃機関（エンジン）の排熱を冷却水（温水）に回収して、温水式気化器に循環移送し加熱源としている。そうすることによって温水ボイラなど温水を作る装置が不要となるので省エネルギーとなり、エンジンも含めて二酸化炭素の排出量を減らして地球温暖化を防止するための有効な施策となっている。特に内航船の場合、日本の領海内を近距離で航行し停泊するまでの時間が短いので、内燃機関（ディーゼルエンジン）は停止する機会が多い。また、内燃機関（エンジン）は停止したとき燃焼が止まるため排熱が発生せず、エンジンの再起動後の暫くの間は、温水式気化器の加熱源が失われているので液化天然ガス（ＬＮＧ）を気化できる熱量を供給することができない。したがって、特許文献２に記載の構成では、ヒータを冷却水（温水）循環ラインに設け、起動時のみヒータで加熱して冷却水（温水）を温水式気化器に送ってＬＮＧを気化させて運転立ち上げができるようにしている。 On the other hand, in a natural gas fuel supply system used for an internal combustion engine for ships, it is not preferable in terms of space efficiency to install an extra facility such as a hot water boiler in a narrow ship. For example, JP-A-2015-147508 (Patent Document) As disclosed in 2), the exhaust heat of the internal combustion engine (engine) is recovered in cooling water (warm water) and circulated and transferred to a hot water vaporizer as a heating source. By doing so, a device for producing hot water such as a hot water boiler is no longer required, which saves energy and is an effective measure for preventing global warming by reducing carbon dioxide emissions including the engine. In particular, in the case of coastal vessels, the time required for navigating in the territorial waters of Japan at a short distance and anchoring is short, so the internal combustion engine (diesel engine) often stops. In addition, when the internal combustion engine (engine) stops, combustion stops and no exhaust heat is generated. For some time after the engine is restarted, the heating source of the hot water vaporizer is lost, so liquefied natural gas ( The amount of heat that can vaporize (LNG) cannot be supplied. Therefore, in the configuration described in Patent Document 2, the heater is provided in the cooling water (hot water) circulation line, and is heated by the heater only at the time of start-up, and the cooling water (hot water) is sent to the hot water vaporizer to vaporize the LNG. It is possible to start up.
　しかし、ヒータを冷却水（温水）循環ラインに設けると、温水ポンプが稼動していないとその循環する冷却水（温水）が気化器に送られてこない。仮に温水ポンプが稼動していたとしてもヒータにより加熱された冷却水（温水）の全体の温度が上がるのに時間がかかる。したがって、冷却水（温水）循環ラインにヒータを設けたとしても循環する冷却水（温水）の量に見合った分のみしか加熱できず、内燃機関（エンジン）が起動する前に起動時のＬＮＧ気化量に相当する熱量を充分に加えることができない。 However, if the heater is installed in the cooling water (hot water) circulation line, the circulating cooling water (hot water) will not be sent to the vaporizer unless the hot water pump is operating. Even if the hot water pump is operating, it takes time to increase the overall temperature of the cooling water (hot water) heated by the heater. Therefore, even if a heater is provided in the cooling water (warm water) circulation line, only the amount corresponding to the amount of circulating coolant (warm water) can be heated, and before starting the internal combustion engine (engine), LNG vaporization at start-up The amount of heat corresponding to the amount cannot be applied sufficiently.
特開２０１２－２２９８６０号公報JP 2012-229860 A 特開２０１５－１４７５０８号公報JP 2015-147508 A
　本発明は、このような事情の下で考え出されたものであって、天然ガスを燃料として駆動する船舶用エンジンの排熱を液体熱媒により回収するように構成された液化天然ガス用気化器において、エンジン停止後における再起動時に天然ガス燃料を速やかに船舶用エンジンに供給するのに適した気化器を提供することを主たる目的とする。 The present invention has been conceived under such circumstances, and is a vaporization for liquefied natural gas configured to recover the exhaust heat of a marine engine driven by natural gas as a fuel by a liquid heat medium. The main object of the present invention is to provide a carburetor suitable for quickly supplying natural gas fuel to a marine engine when restarting after the engine is stopped.
　本発明の第１の側面によれば、天然ガスを燃料として駆動する燃焼装置の排熱を液体熱媒により回収し、液化天然ガスを上記液体熱媒で加熱して気化させる気化器が提供される。当該液化天然ガス用気化器は、上記液体熱媒が補充可能に収容される熱媒容器と、当該熱媒容器の内部に配置され、液化天然ガスが流れる伝熱管と、上記熱媒容器に取り付けられ、上記熱媒容器の内部の上記液体熱媒を加熱するための加熱手段と、を備える。 According to the first aspect of the present invention, there is provided a vaporizer for recovering exhaust heat of a combustion device driven by natural gas as a fuel by a liquid heat medium and heating and vaporizing the liquefied natural gas with the liquid heat medium. The The liquefied natural gas vaporizer is installed in the heat medium container in which the liquid heat medium can be replenished, a heat transfer pipe disposed inside the heat medium container, through which the liquefied natural gas flows, and attached to the heat medium container. And a heating means for heating the liquid heat medium inside the heat medium container.
　好ましくは、上記加熱手段は、上記燃焼装置の停止時において、上記熱媒容器の内部の上記液体熱媒を、外部への放散熱量と同等以上の加熱速度で加熱調節するように構成されている。 Preferably, the heating means is configured to adjust the heating of the liquid heat medium inside the heat medium container at a heating rate equal to or greater than the amount of heat dissipated to the outside when the combustion apparatus is stopped. .
　好ましくは、上記加熱手段は、少なくとも上記燃焼装置の停止時における一部の時間において稼働するように構成されている。 Preferably, the heating means is configured to operate at least during a part of time when the combustion apparatus is stopped.
　好ましくは、上記加熱手段は、シースヒータを含んでいる。 Preferably, the heating means includes a sheath heater.
　好ましくは、上記加熱手段は、上記熱媒容器の内部の上記液体熱媒の温度を検知する温度検知部と、当該温度検知部による検知結果に応じて上記シースヒータの稼働を制御する電源部と、を含む。 Preferably, the heating means includes a temperature detection unit that detects the temperature of the liquid heat medium inside the heating medium container, a power supply unit that controls the operation of the sheath heater according to a detection result by the temperature detection unit, including.
　好ましくは、上記加熱手段は、オートトレースヒータを含んでいる。 Preferably, the heating means includes an auto trace heater.
　好ましくは、上記加熱手段は、上記オートトレースヒータへ電力を供給するための電源部と、上記熱媒容器の外表面の温度を測定し、当該測定温度に応じて上記電源部による電力供給のオン・オフを制御する温度調節部と、を含む。 Preferably, the heating means measures the temperature of the power supply unit for supplying power to the auto trace heater and the outer surface of the heating medium container, and turns on the power supply by the power supply unit according to the measured temperature. A temperature adjusting unit that controls the off-state.
　好ましくは、上記オートトレースヒータは、発熱量を自己制御しながら上記熱媒容器の内部の上記液体熱媒を、外部への放散熱量と同等以上の加熱速度で加熱調節するように構成されている。 Preferably, the auto trace heater is configured to adjust the heating of the liquid heat medium inside the heat medium container at a heating rate equal to or greater than the amount of heat dissipated to the outside while self-controlling the heat generation amount. .
　本発明の第２の側面によれば、天然ガス燃料供給システムが提供される。当該天然ガス燃料供給システムは、燃焼装置としての船舶用エンジンと、液化天然ガスを貯蔵するＬＮＧ貯槽と、本発明の第１の側面に係る上記液化天然ガス用気化器と、上記船舶用エンジンの排熱を上記液体熱媒により回収するための熱回収部と、上記熱回収部と上記気化器との間で上記液体熱媒を循環させる熱媒ラインと、上記ＬＮＧ貯槽から上記伝熱管を経由して気化された天然ガスを上記船舶用エンジンに供給するための配管と、を備える。 According to a second aspect of the present invention, a natural gas fuel supply system is provided. The natural gas fuel supply system includes a marine engine as a combustion device, an LNG storage tank for storing liquefied natural gas, the liquefied natural gas vaporizer according to the first aspect of the present invention, and the marine engine. A heat recovery part for recovering exhaust heat with the liquid heat medium, a heat medium line for circulating the liquid heat medium between the heat recovery part and the vaporizer, and the LNG storage tank via the heat transfer pipe And piping for supplying the vaporized natural gas to the marine engine.
　好ましくは、上記加熱手段は、上記船舶用エンジンの停止時において、上記熱媒容器の内部の上記液体熱媒を、外部への放散熱量と同等以上の加熱速度で加熱調節するように構成されている。 Preferably, the heating means is configured to adjust the heating of the liquid heat medium inside the heat medium container at a heating rate equal to or greater than the amount of heat dissipated to the outside when the marine engine is stopped. Yes.
　好ましくは、上記熱媒容器は、内部に前記伝熱管とは別に設けられた第２の伝熱管を備えており、上記第２の伝熱管は追加の配管を介して上記ＬＮＧ貯槽に気化された天然ガスの一部を戻り供給して、上記ＬＮＧ貯槽の内部圧力を調整するように構成されている。 Preferably, the heat medium container includes a second heat transfer tube provided therein separately from the heat transfer tube, and the second heat transfer tube is vaporized into the LNG storage tank via an additional pipe. A part of the natural gas is supplied back to adjust the internal pressure of the LNG storage tank.
　本発明の第３の側面によれば、本発明の第２の側面にかかる天然ガス燃料供給システムを運転する方法が提供される。当該方法では、上記船舶用エンジンの運転中は上記加熱装置による加熱を停止し、上記船舶用エンジンが停止中に上記加熱装置による加熱を行うようにする。 According to the third aspect of the present invention, there is provided a method of operating the natural gas fuel supply system according to the second aspect of the present invention. In this method, heating by the heating device is stopped during operation of the marine engine, and heating by the heating device is performed while the marine engine is stopped.
　本発明の第４の側面によれば、本発明の第２の側面にかかる天然ガス燃料供給システムを運転する方法が提供される。当該方法では、上記熱媒容器内の液体熱媒が所定温度以上の場合は上記加熱装置による加熱を停止し、上記熱媒容器内の液体熱媒が前記所定温度未満に下降した場合は上記加熱装置による加熱を行うようにする。 According to the fourth aspect of the present invention, there is provided a method for operating the natural gas fuel supply system according to the second aspect of the present invention. In the method, when the liquid heat medium in the heat medium container is at a predetermined temperature or higher, heating by the heating device is stopped, and when the liquid heat medium in the heat medium container falls below the predetermined temperature, the heating is performed. Heat by the device.
　本発明のその他の特徴および利点は、添付図面を参照して以下に行う詳細な説明によって、より明らかとなろう。 Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.
本発明に係る天然ガス燃料供給システムの一実施形態を示す概略構成図である。It is a schematic structure figure showing one embodiment of the natural gas fuel supply system concerning the present invention. 熱媒容器へのシースヒータの取り付け状態の一例を示す概略図である。It is the schematic which shows an example of the attachment state of the sheath heater to a heat carrier container. 本発明に係る液化天然ガス用気化器の他の実施形態を示す概略構成図である。It is a schematic block diagram which shows other embodiment of the vaporizer for liquefied natural gas which concerns on this invention. トレースヒータの概略構造の一例を示す斜視図である。It is a perspective view which shows an example of schematic structure of a trace heater.
　以下、本発明の好ましい実施の形態について、図面を参照して具体的に説明する。 Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
　図１は、本発明に係る天然ガス燃料供給システムの第１実施形態を示している。本実施形態の天然ガス燃料供給システムＸ１は、ＬＮＧ貯槽１と、気化器２と、バッファタンク３と、エンジンジャケット４と、これらに接続される各ラインとを備えている。天然ガス燃料供給システムＸ１は、燃焼装置として例えば船舶用エンジン５に燃料ガスとしての天然ガスを供給するためのものであり、例えば船舶内の船底部分に搭載されている。 FIG. 1 shows a first embodiment of a natural gas fuel supply system according to the present invention. The natural gas fuel supply system X1 of this embodiment includes an LNG storage tank 1, a vaporizer 2, a buffer tank 3, an engine jacket 4, and lines connected to these. The natural gas fuel supply system X1 is for supplying natural gas as fuel gas to the marine engine 5 as a combustion device, for example, and is mounted on, for example, the bottom of the ship.
　ＬＮＧ貯槽１は、燃料となる液化天然ガス（ＬＮＧ）を貯蔵するためのものである。ＬＮＧ貯槽１は、外槽１１および内槽１２を備え、これらの間は断熱材（図示せず）が充填されるとともに真空に減圧された真空断熱層１３とされており、外気からの侵入熱を遮断する構造になっている。ＬＮＧ貯槽１には、ＬＮＧが－１６０℃以下の温度で貯蔵されている。詳細は後述するが、ＬＮＧ貯槽１は、気化器２においてＬＮＧが気化して昇圧した天然ガスを、ガスライン６７を通じて１ＭＰａＧ以下の圧力で受け入れている。 The LNG storage tank 1 is for storing liquefied natural gas (LNG) as fuel. The LNG storage tank 1 includes an outer tank 11 and an inner tank 12, and a heat insulating material (not shown) is filled between the outer tank 11 and the inner tank 12, and the vacuum heat insulating layer 13 is evacuated to a vacuum. It has a structure that shuts off. In the LNG storage tank 1, LNG is stored at a temperature of −160 ° C. or lower. As will be described in detail later, the LNG storage tank 1 receives natural gas, which has been pressurized by LNG vaporized in the vaporizer 2, through the gas line 67 at a pressure of 1 MPaG or less.
　ＬＮＧ貯槽１の下部には、ＬＮＧ供給ライン６１が接続されている。ＬＮＧ供給ライン６１は、ＬＮＧ貯槽１から送り出されるＬＮＧを気化器２に移送するための流路である。ＬＮＧ供給ライン６１には、遮断弁６１１が設けられている。 The LNG supply line 61 is connected to the lower part of the LNG storage tank 1. The LNG supply line 61 is a flow path for transferring LNG delivered from the LNG storage tank 1 to the vaporizer 2. The LNG supply line 61 is provided with a cutoff valve 611.
　気化器２は、液体熱媒を加熱源として、ＬＮＧを蒸発気化するためのものである。気化器２は、熱媒容器２１と、熱媒容器２１の内部に配置された伝熱管２２，２３とを備えている。 The vaporizer 2 is for evaporating and vaporizing LNG using a liquid heat medium as a heating source. The vaporizer 2 includes a heat medium container 21 and heat transfer tubes 22 and 23 disposed inside the heat medium container 21.
　熱媒容器２１は、液体熱媒を収容するための密閉状容器である。熱媒容器２１には、伝熱管２２内のＬＮＧを加熱気化するための液体熱媒が収容されている。当該液体熱媒としては、例えば温水が挙げられる。 The heat medium container 21 is a sealed container for accommodating a liquid heat medium. The heat medium container 21 accommodates a liquid heat medium for heating and vaporizing the LNG in the heat transfer tube 22. Examples of the liquid heat medium include warm water.
　本実施形態において、熱媒容器２１は、フランジ構造の底板２１１の上に略釣鐘状の容器体２１２が載った構造をしており、容器体２１２と底板２１１とはガスケットを挟んでボルトで一体化固定されている。このような構成によって、定期的な検査が必要となる場合、温水（液体熱媒）を抜き出してボルトを外せば容器体２１２はＬＮＧの配管（ＬＮＧ供給ライン６１）や温水の配管（後述の熱媒ライン６２，６３等）を外すことなく上部に簡単に引き上げることができ、伝熱管２２，２３を直接検査できるようになる。 In the present embodiment, the heat medium container 21 has a structure in which a substantially bell-shaped container body 212 is mounted on a bottom plate 211 having a flange structure, and the container body 212 and the bottom plate 211 are integrated with a bolt with a gasket interposed therebetween. Fixed. With such a configuration, when periodic inspection is required, the container body 212 can be connected to an LNG pipe (LNG supply line 61) or hot water pipe (heat to be described later) by removing hot water (liquid heating medium) and removing the bolts. The medium lines 62, 63, etc.) can be easily pulled up without removing the medium lines 62, 63, etc., and the heat transfer tubes 22, 23 can be directly inspected.
　熱媒容器２１には、熱媒ライン６２，６３が接続されている。熱媒ライン６２，６３は、気化器２とエンジンジャケット４との間で温水を循環させるためのものである。熱媒ライン６２は、熱媒容器２１の下部（底板２１１）に接続されており、エンジンジャケット４（熱回収部）を経た温水が熱媒ライン６２を介して熱媒容器２１内に導入される。熱媒ライン６３は、熱媒容器２１の下部（底板２１１）に接続され、かつ底板２１１をシールされた状態で貫通するオーバーフロー管２４につながっている。熱媒ライン６２を介して順次供給されることにより熱媒容器２１の内部を通過した温水は、オーバーフロー管２４を介して熱媒ライン６３に排出される。熱媒ライン６３には循環用ポンプ６３１が設けられている。詳細は後述するが、熱媒容器２１から排出される温水は、エンジンジャケット４において再加熱され、再び気化器２（熱媒容器２１）に供給されて循環利用される。 Heat medium lines 62 and 63 are connected to the heat medium container 21. The heat medium lines 62 and 63 are for circulating hot water between the vaporizer 2 and the engine jacket 4. The heat medium line 62 is connected to the lower part (bottom plate 211) of the heat medium container 21, and hot water that has passed through the engine jacket 4 (heat recovery unit) is introduced into the heat medium container 21 through the heat medium line 62. . The heat medium line 63 is connected to the lower part (bottom plate 211) of the heat medium container 21 and is connected to the overflow pipe 24 that penetrates the bottom plate 211 in a sealed state. The hot water that has passed through the inside of the heat medium container 21 by being sequentially supplied via the heat medium line 62 is discharged to the heat medium line 63 via the overflow pipe 24. The heat medium line 63 is provided with a circulation pump 631. Although details will be described later, the hot water discharged from the heat medium container 21 is reheated in the engine jacket 4, supplied again to the vaporizer 2 (heat medium container 21), and recycled.
　伝熱管２２は、熱媒容器２１内に導入されるＬＮＧが流れる流路であり、例えばコイル状に巻かれている。伝熱管２２の上流端は、熱媒容器２１の下部（底板２１１）を貫通してＬＮＧ供給ライン６１につながっている。熱媒容器２１の下部（底板２１１）にはまた、ガスライン６４が接続されている。伝熱管２２の下流端は、底板２１１を貫通してガスライン６４につながっている。 The heat transfer tube 22 is a flow path through which LNG introduced into the heat medium container 21 flows, and is wound, for example, in a coil shape. The upstream end of the heat transfer tube 22 passes through the lower part (bottom plate 211) of the heat medium container 21 and is connected to the LNG supply line 61. A gas line 64 is also connected to the lower part (bottom plate 211) of the heat medium container 21. The downstream end of the heat transfer tube 22 passes through the bottom plate 211 and is connected to the gas line 64.
　伝熱管２２内のＬＮＧは、周囲にある温水により加熱されて蒸発気化し、気化した天然ガスが、熱媒容器２１の外部に通じるガスライン６４に排出される。ガスライン６４の下流端には、バッファタンク３が設けられている。伝熱管２２において気化した天然ガスは、ガスライン６４を介してバッファタンク３に送り込まれる。ガスライン６４には、遮断弁６４１が設けられている。 The LNG in the heat transfer tube 22 is heated and vaporized by the surrounding warm water, and the vaporized natural gas is discharged to the gas line 64 that leads to the outside of the heat medium container 21. A buffer tank 3 is provided at the downstream end of the gas line 64. The natural gas vaporized in the heat transfer tube 22 is sent to the buffer tank 3 through the gas line 64. The gas line 64 is provided with a shutoff valve 641.
　ここで、液体熱媒として温水を用いる場合、当該温水の使用温度は、例えば２０～８０℃であり、好ましくは４０～６０℃である。伝熱管２２内において気化した天然ガスは、例えば、２０℃以上の温度に加温されて０．７０ＭＰａＧ程度の圧力で排出される。 Here, when hot water is used as the liquid heat medium, the use temperature of the hot water is, for example, 20 to 80 ° C., preferably 40 to 60 ° C. The natural gas vaporized in the heat transfer tube 22 is heated to, for example, a temperature of 20 ° C. or higher and discharged at a pressure of about 0.70 MPaG.
　伝熱管２３は、熱媒容器２１内に導入されるＬＮＧが流れる流路であり、例えばコイル状に巻かれている。伝熱管２３は、気化した天然ガスによりＬＮＧ貯槽１内部の空間部分の圧力を高めるためのものである。伝熱管２３の上流端は、熱媒容器２１の下部（底板２１１）を貫通してＬＮＧ供給ライン６６につながっている。ＬＮＧ供給ライン６６は、ＬＮＧ供給ライン６１の途中において分岐状に接続されている。ＬＮＧ供給ライン６６には、遮断弁６６１が設けられている。熱媒容器２１の下部（底板２１１）にはまた、ガスライン６７が接続されている。伝熱管２３の下流端は、底板２１１を貫通してガスライン６７につながっている。ガスライン６７には、圧力制御弁６７１が設けられている。 The heat transfer tube 23 is a flow path through which LNG introduced into the heat medium container 21 flows, and is wound, for example, in a coil shape. The heat transfer tube 23 is for increasing the pressure in the space portion inside the LNG storage tank 1 by the vaporized natural gas. The upstream end of the heat transfer tube 23 passes through the lower part (bottom plate 211) of the heat medium container 21 and is connected to the LNG supply line 66. The LNG supply line 66 is branched in the middle of the LNG supply line 61. The LNG supply line 66 is provided with a shutoff valve 661. A gas line 67 is also connected to the lower part (bottom plate 211) of the heat medium container 21. The downstream end of the heat transfer tube 23 passes through the bottom plate 211 and is connected to the gas line 67. The gas line 67 is provided with a pressure control valve 671.
　伝熱管２３において気化した天然ガスは、ガスライン６７を通じてＬＮＧ貯槽１に送られる。ガスライン６７内ではガス圧力が例えば０．７５ＭＰａＧまで加圧される。この加圧圧力は、ＬＮＧ貯槽１からのＬＮＧ供給圧力となり、内燃機関である船舶用エンジン５（ディーゼルエンジン）に必要なガス燃料供給圧力源となる。 The natural gas vaporized in the heat transfer tube 23 is sent to the LNG storage tank 1 through the gas line 67. In the gas line 67, the gas pressure is increased to, for example, 0.75 MPaG. This pressurization pressure becomes the LNG supply pressure from the LNG storage tank 1, and becomes a gas fuel supply pressure source necessary for the marine engine 5 (diesel engine) which is an internal combustion engine.
　本実施形態において、熱媒容器２１（容器体２１２）には、シースヒータ２５が設けられている。シースヒータ２５は、容器体２１２の側面下部に設置されており、電源部２６から電力供給を受けて稼働する。図２は、熱媒容器２１へのシースヒータ２５の取り付け状態の一例を示している。シースヒータ２５は、ニクロム線を酸化マグネシウムの絶縁粉末で覆いシースとなる金属パイプ内に収納された構造を有する。同図に示した構成において、シースヒータ２５は、キャップ２５１内で電気ケーブルから加熱エレメントになるニクロム線に接続され、熱媒容器２１内の温水に浸される。そして、例えばシースヒータ２５のフランジ２５２が、ガスケットを挟んだ状態でのボルト締結により、容器体２１２のフランジ２１３に固定される。 In the present embodiment, the heat medium container 21 (container body 212) is provided with a sheath heater 25. The sheath heater 25 is installed in the lower part of the side surface of the container body 212 and operates by receiving power supply from the power supply unit 26. FIG. 2 shows an example of a state in which the sheath heater 25 is attached to the heat medium container 21. The sheath heater 25 has a structure in which a nichrome wire is covered with an insulating powder of magnesium oxide and housed in a metal pipe serving as a sheath. In the configuration shown in the figure, the sheath heater 25 is connected to a nichrome wire that becomes a heating element from an electric cable in the cap 251, and is immersed in the hot water in the heating medium container 21. For example, the flange 252 of the sheath heater 25 is fixed to the flange 213 of the container body 212 by bolt fastening in a state where a gasket is sandwiched.
　本実施形態においてまた、熱媒容器２１（容器体２１２）には、温度検知部２７が設けられている。温度検知部２７は、熱媒容器２１の内部に導入された測温部によって温水の温度を検知する。電源部２６は、温度検知部２７による検知結果に応じてシースヒータ２５の稼働ないし非稼働を制御する。例えば船舶用エンジン５が停止しエンジンジャケット４から温水による船舶用エンジン５の排熱を回収しなくなった場合に、熱媒容器２１が放熱して温水温度が低下するのを抑制するために、放熱量に見合う熱量を供給するようにシースヒータ２５が稼働される。上記のシースヒータ２５、電源部２６、および温度検知部２７は、加熱手段を構成する。 In the present embodiment, the heat medium container 21 (container body 212) is also provided with a temperature detection unit 27. The temperature detection unit 27 detects the temperature of the hot water using a temperature measurement unit introduced into the heat medium container 21. The power supply unit 26 controls the operation or non-operation of the sheath heater 25 according to the detection result by the temperature detection unit 27. For example, when the marine engine 5 is stopped and the exhaust heat of the marine engine 5 due to the hot water is no longer recovered from the engine jacket 4, the heat medium container 21 dissipates heat to prevent the hot water temperature from decreasing. The sheath heater 25 is operated so as to supply a heat amount corresponding to the heat amount. The sheath heater 25, the power supply unit 26, and the temperature detection unit 27 constitute a heating unit.
　本実施形態において、容器体２１２の外表面には、保温材２８が取り付けられている。保温材２８としては、例えばロックウールが用いられ、このロックウールは容器体２１２の表面を厚さ約５０ｍｍで覆っている。 In this embodiment, the heat insulating material 28 is attached to the outer surface of the container body 212. For example, rock wool is used as the heat insulating material 28, and the rock wool covers the surface of the container body 212 with a thickness of about 50 mm.
　バッファタンク３は、天然ガスを収容可能な密閉状容器である。バッファタンク３は、ガスライン６４で送り込まれた天然ガス燃料について後段の燃焼装置（船舶用エンジン５）の消費ガス量の負荷変動を吸収するために用いられる。例えば燃焼装置が内燃機関の場合、バッファタンク３により天然ガスを貯留する構成は有効である。バッファタンク３にはガスライン６５が接続されている。ガスライン６５には、圧力制御弁６５１が設けられている。 The buffer tank 3 is a sealed container that can store natural gas. The buffer tank 3 is used to absorb the load fluctuation of the consumption gas amount of the subsequent combustion device (the marine engine 5) for the natural gas fuel fed through the gas line 64. For example, when the combustion apparatus is an internal combustion engine, a configuration in which natural gas is stored by the buffer tank 3 is effective. A gas line 65 is connected to the buffer tank 3. The gas line 65 is provided with a pressure control valve 651.
　ガスライン６５を経た天然ガスは、船舶用エンジン５に供給される。船舶用エンジン５は、例えば６気筒の２元燃料ディーゼルエンジンである。図１において、船舶用エンジン５について１つの気筒のみを模式的に表している。 The natural gas that has passed through the gas line 65 is supplied to the marine engine 5. The marine engine 5 is, for example, a 6-cylinder dual fuel diesel engine. In FIG. 1, only one cylinder of the marine engine 5 is schematically shown.
　船舶用エンジン５は、主燃焼室であるシリンダ５１、および副燃焼室５２を備える。副燃焼室５２にはパイロット液体燃料噴射口が設けられており、重油や軽油などのパイロット液体燃料が噴射送入され着火燃焼してシリンダ５１に入る。シリンダ５１には、吸気口５１１および排気口５１２が設けられている。吸気口５１１には、ガスライン６５から圧力制御弁６５１を通じて送入された天然ガス（燃料）と空気とが予混合され、当該混合ガスが例えば０．７０ＭＰａＧ以下の圧力でシリンダ５１へ流入してシリンダ５１内で燃焼爆発する。このとき発生した動力はピストン５３を変位させ、クランク５４を回しながらシャフトを通じてスクリュー（図示せず）を回す船舶駆動エネルギーとなる。 The marine engine 5 includes a cylinder 51 that is a main combustion chamber, and a sub-combustion chamber 52. A pilot liquid fuel injection port is provided in the sub-combustion chamber 52, and pilot liquid fuel such as heavy oil or light oil is injected and injected, ignited and burned, and enters the cylinder 51. The cylinder 51 is provided with an intake port 511 and an exhaust port 512. Natural gas (fuel) and air sent from the gas line 65 through the pressure control valve 651 are premixed in the intake port 511, and the mixed gas flows into the cylinder 51 at a pressure of 0.70 MPaG or less, for example. Combustion explosion occurs in the cylinder 51. The power generated at this time becomes the ship drive energy that displaces the piston 53 and rotates the crank 54 while turning the screw (not shown) through the shaft.
　エンジンジャケット４は、船舶用エンジン５の排熱を温水により回収するためのものであり、シリンダ５１の外周に設けられている。エンジンジャケット４には、熱媒ライン６３の下流端および熱媒ライン６２の上流端が接続されている。熱媒ライン６３を介してエンジンジャケット４に導入される温水は、エンジンジャケット４を通過して熱媒ライン６２へ送り出される。エンジンジャケット４を通過する温水は、シリンダ５１を冷却しながら、船舶用エンジン５の燃焼排熱を回収する。温水の温度は、エンジンジャケット４を通過することで例えば５～１０℃程度上昇する。 The engine jacket 4 is for recovering the exhaust heat of the marine engine 5 with hot water, and is provided on the outer periphery of the cylinder 51. The engine jacket 4 is connected to the downstream end of the heat medium line 63 and the upstream end of the heat medium line 62. The hot water introduced into the engine jacket 4 through the heat medium line 63 passes through the engine jacket 4 and is sent out to the heat medium line 62. The hot water passing through the engine jacket 4 collects combustion exhaust heat of the marine engine 5 while cooling the cylinder 51. The temperature of the hot water rises, for example, by about 5 to 10 ° C. by passing through the engine jacket 4.
　次に、天然ガス燃料供給システムＸ１における温水の熱量バランスについて説明する。天然ガス燃料供給システムＸ１の大きさは、一般的に当該天然ガス燃料供給システムＸ１が搭載される船舶の大きさ（燃料消費量）によって異なり、気化器２における熱媒容器２１の容量についても、船舶の大きさに応じて変わる。当該船舶における船舶用エンジン５が例えば６気筒２元燃料ディーゼルエンジンで出力が１，５００ｋｗの場合、エンジン駆動に必要な天然ガス燃料供給量については７０ｋｇ／ｈ～４００ｋｇ／ｈの範囲となる。これを天然ガス燃料供給システムＸ１として必要な気化器２の大きさに換算すると、伝熱管２２を加温する円筒型の熱媒容器２１の直径は約１．２ｍ、高さが約１ｍ～２ｍの範囲となり、熱媒容器２１の容量としては約１ｍ3～２ｍ3の範囲となる。 Next, the heat balance of warm water in the natural gas fuel supply system X1 will be described. The size of the natural gas fuel supply system X1 generally varies depending on the size of the ship (fuel consumption) on which the natural gas fuel supply system X1 is mounted, and the capacity of the heat medium container 21 in the vaporizer 2 is also It depends on the size of the ship. When the marine engine 5 in the marine vessel is, for example, a 6-cylinder dual fuel diesel engine and the output is 1,500 kw, the supply amount of natural gas fuel required for driving the engine is in the range of 70 kg / h to 400 kg / h. When this is converted into the size of the vaporizer 2 required for the natural gas fuel supply system X1, the diameter of the cylindrical heating medium container 21 for heating the heat transfer tube 22 is about 1.2 m and the height is about 1 m to 2 m. The capacity of the heat medium container 21 is in the range of about 1 m 3 to 2 m 3 .
　気化器２、エンジンジャケット４および熱媒ライン６２，６３において循環する温水ついては、エンジンジャケット４における船舶用エンジン５の排熱回収により昇温され、熱媒ライン６２を介して熱媒容器２１に送り込まれる。排熱回収により温水の温度は例えば６０℃程度にまで高められており、このように加熱された温水は、円筒状の熱媒容器２１内でコイル状の伝熱管２２，２３に衝突しながらＬＮＧを天然ガスに気化蒸発させ、さらに天然ガスを２０℃以上にまで加温する。ここで、温水は約５℃の温度降下により約５５℃となってオーバーフロー管２４を介して熱媒ライン６３へ排出され、循環用ポンプ６３１で再び加圧された後、エンジンジャケット４に戻される。 The warm water circulating in the carburetor 2, the engine jacket 4, and the heat medium lines 62 and 63 is heated by the exhaust heat recovery of the marine engine 5 in the engine jacket 4 and sent to the heat medium container 21 through the heat medium line 62. It is. The temperature of the hot water is increased to, for example, about 60 ° C. by exhaust heat recovery, and the heated hot water is LNG while colliding with the coiled heat transfer tubes 22 and 23 in the cylindrical heat medium container 21. Is vaporized and evaporated into natural gas, and the natural gas is further heated to 20 ° C. or higher. Here, the hot water becomes about 55 ° C. due to a temperature drop of about 5 ° C., is discharged to the heat medium line 63 through the overflow pipe 24, is pressurized again by the circulation pump 631, and then returned to the engine jacket 4. .
　天然ガス燃料供給量が例えば４００ｋｇ／ｈの場合、温水によって－１６０℃のＬＮＧを気化して２０℃の天然ガスにするのに必要な加熱量は、冬季で最大約８８，５００ｋｃａｌ／ｈとなる。また、気化器２での放散熱量については、船室内の温度に応じて変動する。保温材２８を施した熱媒容器２１から放散する熱量は、例えば、冬季において船室内温度が５℃の場合に約１，３００ｋｃａｌ／ｈであり、夏季において船室内温度が４５℃の場合に約３７０ｋｃａｌ／ｈである。以上より、熱媒容器２１における放散熱量は、全加熱量の約０．４％～１．５％に過ぎないことが分かる。 When the supply amount of natural gas fuel is 400 kg / h, for example, the heating amount required to vaporize LNG of −160 ° C. with hot water to become natural gas of 20 ° C. is about 88,500 kcal / h in winter. . Further, the amount of heat dissipated in the vaporizer 2 varies depending on the temperature in the cabin. The amount of heat dissipated from the heat medium container 21 to which the heat insulating material 28 is applied is, for example, about 1,300 kcal / h when the cabin temperature is 5 ° C. in winter, and about when the cabin temperature is 45 ° C. in summer. 370 kcal / h. From the above, it can be seen that the amount of heat dissipated in the heat medium container 21 is only about 0.4% to 1.5% of the total heating amount.
　本実施形態において、気化器２は円筒竪型で内容積が大きく、コイル状の伝熱管２２が温水で満たされた熱媒容器２１内に浸されている。即ち、気化器２を複数のユニットに小分けせず一括してＬＮＧを気化させている。これにより、熱媒容器２１内では循環ライン（熱媒ライン６２，６３）内に比べて多くの温水が滞留している。例えば熱媒容器２１内の温水量は熱媒ライン６２，６３内の温水量の約３０倍程度にもなり、熱媒容器２１では温水の熱保有量が大きい。 In this embodiment, the vaporizer 2 has a cylindrical bowl shape and a large internal volume, and the coiled heat transfer tube 22 is immersed in a heat medium container 21 filled with warm water. That is, the LNG is vaporized collectively without dividing the vaporizer 2 into a plurality of units. As a result, more hot water stays in the heat medium container 21 than in the circulation lines (heat medium lines 62 and 63). For example, the amount of hot water in the heat medium container 21 is about 30 times the amount of hot water in the heat medium lines 62 and 63, and the heat medium container 21 has a large amount of hot water.
　また、熱媒容器２１は、その容量の割には外側の表面積が比較的小さく、保温をしておけば放熱しにくくなる。したがって、船舶用エンジン５が停止して排熱回収が止まったり温水の流れが停止したときには、そのまま放散熱量と同等の熱量を気化器２に補給すれば、温水の温度低下を抑制することができる。この結果、いつでも液化天然ガス（ＬＮＧ）を気化させて必要なガス温度にまで上昇させることができ、船舶用エンジン５の再起動のために必要な天然ガスを迅速に供給することができる。即ち、液化天然ガスの気化は気化器２だけでしか行われないため、熱媒容器２１の表面から放散している熱量に相当する熱量を船舶用エンジン５の停止時に熱媒容器２１に加えておけば、船舶用エンジン５が停止して温水循環が止まっていても、いつでも天然ガスを必要な温度（例えばディーゼルエンジンの場合では２０℃以上）で気化供給できる。 Also, the heat medium container 21 has a relatively small outer surface area for its capacity, and it is difficult to dissipate heat if it is kept warm. Therefore, when the marine engine 5 stops and exhaust heat recovery stops or the flow of hot water stops, if the vaporizer 2 is replenished with the same amount of heat as the amount of heat dissipated, the temperature drop of the hot water can be suppressed. . As a result, liquefied natural gas (LNG) can be vaporized and raised to a necessary gas temperature at any time, and the natural gas necessary for restarting the marine engine 5 can be quickly supplied. That is, since the liquefied natural gas is vaporized only by the vaporizer 2, a heat amount corresponding to the amount of heat dissipated from the surface of the heat medium container 21 is added to the heat medium container 21 when the marine engine 5 is stopped. If it does, even if the marine engine 5 stops and the hot water circulation stops, natural gas can be vaporized and supplied at a required temperature (for example, 20 ° C. or more in the case of a diesel engine).
　本実施形態においては、船舶用エンジン５の停止時に熱媒容器２１へ熱量を加えるために、熱媒容器２１にシースヒータ２５が設けられている。シースヒータ２５は、加熱容量が１～２ｋｗ程度と小さく、形状も自由な形にできるので、熱媒容器２１内のコイル状の伝熱管２２，２３等の横であって熱媒容器２１の下部付近に取り付ければ、熱媒容器２１内の温水は適当に対流する。上記のような対策を取れば、船舶用エンジン５の停止時における熱媒容器２１からの放熱量は減少するため、結果として必要な加熱量も少量ですむ。このため、船舶用エンジン５が停止したときは、加熱に蒸気や熱媒を利用するのではなく、電気式のシースヒータ２５を設けるのが設備の簡便性と効率の観点からも有利である。 In the present embodiment, a sheath heater 25 is provided in the heat medium container 21 in order to apply heat to the heat medium container 21 when the marine engine 5 is stopped. The sheath heater 25 has a small heating capacity of about 1 to 2 kW and can be freely shaped, so that it is next to the coiled heat transfer tubes 22 and 23 in the heat medium container 21 and near the lower part of the heat medium container 21. If it attaches to, the hot water in the heat-medium container 21 will convect appropriately. If the above measures are taken, the amount of heat released from the heat medium container 21 when the marine engine 5 is stopped decreases, and as a result, a small amount of heating is required. For this reason, when the marine engine 5 is stopped, it is advantageous from the viewpoint of simplicity and efficiency of equipment to provide an electric sheath heater 25 instead of using steam or a heat medium for heating.
　本実施形態では、熱媒容器２１には温度検知部２７が設けられており、温度検知部２７により検知した熱媒容器２１内部の温水温度に応じて、電源部２６がシースヒータ２５の稼働を制御する。このような構成によれば、シースヒータ２５により熱媒容器２１内の温水からの熱放出に見合う熱量を加えるとき、船舶用エンジン５の駆動・停止に関係なく常時流れる温水の温度（約５５～６０℃）より少し低い温度（例えば５０℃）をシースヒータ２５が稼働する温度設定値としておけば、船舶用エンジン５が駆動している場合には、シースヒータ２５による加熱が自動的に停止する。その一方、船舶用エンジン５が停止している場合には、熱媒容器２１からの放熱分（１～２ｋＷ程度）に相当する少量の加熱速度でシースヒータ２５が温水を加熱して熱媒容器２１内を循環対流させてくれるので、特別な運転管理は不要である。 In the present embodiment, the heat medium container 21 is provided with a temperature detection unit 27, and the power supply unit 26 controls the operation of the sheath heater 25 according to the temperature of the hot water inside the heat medium container 21 detected by the temperature detection unit 27. To do. According to such a configuration, when the amount of heat corresponding to the heat release from the hot water in the heat medium container 21 is applied by the sheath heater 25, the temperature of the hot water that always flows regardless of whether the marine engine 5 is driven or stopped (about 55 to 60). If a temperature setting value (for example, 50 ° C.) that is slightly lower than (° C.) is set as a temperature setting value at which the sheath heater 25 operates, heating by the sheath heater 25 is automatically stopped when the marine engine 5 is driven. On the other hand, when the marine engine 5 is stopped, the sheath heater 25 heats the hot water at a small heating rate corresponding to the heat radiation from the heat medium container 21 (about 1 to 2 kW), and the heat medium container 21. Because it circulates in the interior, no special operation management is required.
　上記のように温度検知部２７を用いてシースヒータ２５の稼働を制御すると、熱媒容器２１（気化器２）の外部環境温度（船室内温度）に変化が生じた場合においても放熱量相当分の熱量を加えておくことになるので、熱媒容器２１内の温水を所定温度に維持することができる。そして、例えば船室内温度が相対的に低い冬季においては、船舶用エンジン５の停止時には常時シースヒータ２５による加熱が行われるとしても、船室内温度が相対的に高い夏季においては、熱媒容器２１からの放熱量が少ないことから、船舶用エンジン５の停止時における一部の時間においてシースヒータ２５による温度維持を目的とした加熱が行われるだけでよい。したがって、このような構成によれば、別途ヒータを冷却水循環ラインに設けるよりも、船舶用エンジン５が停止している待機状態でのコストを削減することができる。 When the operation of the sheath heater 25 is controlled using the temperature detection unit 27 as described above, even when a change occurs in the external environment temperature (the cabin temperature) of the heat medium container 21 (vaporizer 2), an amount equivalent to the heat radiation amount is obtained. Since the amount of heat is added, the hot water in the heat medium container 21 can be maintained at a predetermined temperature. For example, in the winter season when the cabin temperature is relatively low, the sheath heater 25 always performs heating when the marine engine 5 is stopped, but in the summer when the cabin temperature is relatively high, the heating medium container 21 Therefore, heating for the purpose of maintaining the temperature by the sheath heater 25 only needs to be performed during a part of the time when the marine engine 5 is stopped. Therefore, according to such a configuration, it is possible to reduce the cost in a standby state in which the marine engine 5 is stopped, rather than separately providing a heater in the cooling water circulation line.
　図３は、本発明に係る液化天然ガス用気化器の第２実施形態を示す概略構成図である。図３に示した気化器２においては、オートトレースヒータ２９が設けられており、この点において図１に示した第１実施形態の気化器２と異なっている。なお、図３においては、上記第１実施形態と同一または類似の要素には、上記第１実施形態と同一の符号を付しており、適宜説明を省略する。 FIG. 3 is a schematic configuration diagram showing a second embodiment of the vaporizer for liquefied natural gas according to the present invention. The vaporizer 2 shown in FIG. 3 is provided with an auto trace heater 29, which is different from the vaporizer 2 of the first embodiment shown in FIG. In FIG. 3, the same or similar elements as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof will be omitted as appropriate.
　図３に示した気化器２においては、オートトレースヒータ２９は、熱媒容器２１（容器体２１２）の外表面に取り付けられており、電源部２０１からの電力供給を受けて稼働する。図４は、オートトレースヒータ２９の概略構造の一例を示す斜視図である。オートトレースヒータ２９は、ニクロム線（ニッケルとクロムの合金）からなる導線２９１と、導線２９１の外側に被覆された導電性のカーボンを含んだ樹脂からなる発熱抵抗体２９２と、さらに発熱抵抗体２９２の外側を被覆する不導体の外装被覆材２９３と、を含んでいる。オートトレースヒータ２９全体の形状は、通常帯状となっている。発熱抵抗体２９２は導線２９１を架橋しながら電気が流れ発熱するが、温度が高くなると電気の流れ抵抗が増加して発熱量が減少してオートトレースヒータ２９の温度が上昇しないように自己制御する特性を有する。 In the vaporizer 2 shown in FIG. 3, the auto trace heater 29 is attached to the outer surface of the heat medium container 21 (container body 212), and operates by receiving power supply from the power supply unit 201. FIG. 4 is a perspective view showing an example of a schematic structure of the auto trace heater 29. The auto trace heater 29 includes a conductive wire 291 made of nichrome wire (nickel and chromium alloy), a heating resistor 292 made of resin containing conductive carbon coated on the outside of the conductive wire 291, and a heating resistor 292. And a non-conductive exterior covering material 293 that covers the outer side. The shape of the entire auto trace heater 29 is usually a belt shape. The heating resistor 292 performs self-control so that electricity flows and generates heat while bridging the conductive wire 291 so that the temperature of the auto trace heater 29 does not increase as the temperature increases, the resistance of the electric flow increases and the amount of generated heat decreases. Has characteristics.
　帯状のオートトレースヒータ２９は、例えば、容器体２１２と保温材２８との隙間部分において、容器体２１２の外周を螺旋状に巻き付けるように取り付けられる。例えば長さ１ｍあたりの容量が２０～４０Ｗ程度のオートトレースヒータ２９を用いれば、オートトレースヒータ２９の必要延べ長さは数十ｍでよい。熱媒容器２１の外径が約１．２ｍであれば、オートトレースヒータ２９の巻き数は、熱媒容器２１の高さによって数巻きから２０巻き程度でよいことになる。例えば天然ガス燃料供給量が例えば４００ｋｇ／ｈの場合における熱媒容器２１の放散熱量は、冬季で最大１，３００ｋｃａｌ／ｈ程度であるので、オートトレースヒータ２９の加熱速度としては１．５ｋｗが必要である。オートトレースヒータ２９が長さ１ｍあたり２４Ｗの容量を有しておれば、オートトレースヒータ２９の必要長さは６２．５ｍとなり、外径１．２ｍの熱媒容器２１ではオートトレースヒータ２９の巻き数は１６．６となる。なお、図３においては、施工を容易に行う観点から、オートトレースヒータ２９が２セット取り付けられる場合の構成図を図示した。 The strip-shaped auto trace heater 29 is attached, for example, so that the outer periphery of the container body 212 is spirally wound in a gap portion between the container body 212 and the heat insulating material 28. For example, when the auto trace heater 29 having a capacity of about 20 to 40 W per 1 m length is used, the required total length of the auto trace heater 29 may be several tens of meters. If the outer diameter of the heat medium container 21 is about 1.2 m, the number of turns of the auto trace heater 29 may be several turns to about 20 turns depending on the height of the heat medium container 21. For example, when the supply amount of natural gas fuel is 400 kg / h, for example, the maximum amount of heat dissipated in the heat medium container 21 is about 1,300 kcal / h in winter, so that the heating rate of the auto trace heater 29 is 1.5 kw. It is. If the auto trace heater 29 has a capacity of 24 W per meter, the required length of the auto trace heater 29 is 62.5 m. In the heat medium container 21 having an outer diameter of 1.2 m, the auto trace heater 29 is wound. The number is 16.6. In addition, in FIG. 3, the block diagram in case two sets of the auto trace heater 29 are attached was illustrated from a viewpoint of performing construction easily.
　上記第２実施形態においては、熱媒容器２１（容器体２１２）の外表面温度を測定するための温度センサ２０２が容器体２１２の表面に取り付けられている。温度センサ２０２はサーモスタット２０３に連結されており、サーモスタット２０３は、温度センサ２０２での測定温度に応じて電源部２０１によるオートトレースヒータ２９への電力供給のオン・オフを制御する。 In the second embodiment, the temperature sensor 202 for measuring the outer surface temperature of the heat medium container 21 (container body 212) is attached to the surface of the container body 212. The temperature sensor 202 is connected to a thermostat 203, and the thermostat 203 controls on / off of power supply to the auto trace heater 29 by the power supply unit 201 according to the temperature measured by the temperature sensor 202.
　上記のオートトレースヒータ２９、電源部２０１、温度センサ２０２、およびサーモスタット２０３は、加熱手段を構成する。 The above-described auto trace heater 29, power supply unit 201, temperature sensor 202, and thermostat 203 constitute a heating means.
　上記第２実施形態においては、加熱手段として自己制御性を有するオートトレースヒータ２９が用いられる。このため、加熱手段（オートトレースヒータ２９）の加熱による過度な温度上昇を防止することができる。したがって、ＬＮＧの加熱を行うような危険場所とされるところでは、安全に使用することができるので好ましい。熱媒容器２１の表面温度を測る温度センサ２０２とサーモスタット２０３を連結して制御すれば、さらに温度制御性がよくなる。 In the second embodiment, the auto trace heater 29 having self-controllability is used as the heating means. For this reason, the excessive temperature rise by the heating of a heating means (auto trace heater 29) can be prevented. Therefore, it can be used safely in a dangerous place where LNG is heated, which is preferable. If the temperature sensor 202 for measuring the surface temperature of the heat medium container 21 and the thermostat 203 are connected and controlled, the temperature controllability is further improved.
　オートトレースヒータ２９はシースヒータ２５と異なり、温水を直接加熱するのではなく、温水からの放熱に相当する熱量を容器体２１２の表面に加える。これにより、加熱だけでなく温水からの放熱を抑制する効果も生じる。 Unlike the sheath heater 25, the auto trace heater 29 does not directly heat the hot water, but adds a quantity of heat corresponding to heat radiation from the hot water to the surface of the container body 212. Thereby, the effect which suppresses the heat dissipation from not only heating but warm water also arises.
　次に、本発明の２つの実施形態に係るヒータ（シースヒータ２５あるいはオートトレースヒータ２９）が熱媒容器２１に設けられている場合の実施例と、熱媒容器２１にヒータが設けられていない場合の比較例とについて、船舶用エンジン５の停止後にエンジンを再起動させるときの気化器２の温度状態について比較検討する。本比較検討に用いた気化器２については、温水の容量が２ｍ3とし、天然ガス燃料供給量が４００ｋｇ／ｈとした。 Next, an example in which the heater (sheath heater 25 or auto trace heater 29) according to the two embodiments of the present invention is provided in the heat medium container 21, and a case in which the heater is not provided in the heat medium container 21 As for the comparative example, the temperature state of the carburetor 2 when the engine is restarted after the marine engine 5 is stopped will be compared. For carburetor 2 used in this comparative study, the capacity of the hot water and 2m 3, natural gas fuel supply amount is set to 400 kg / h.
　熱媒容器２１にヒータが設けられていない場合（比較例）、例えば冬季５℃での熱媒容器２１からの放散熱量は１，３００ｋｃａｌ／ｈであるので、２ｍ3容量の熱媒容器２１内に温水が６０℃で滞留しているとき、単純に温水温度が変化しても放散熱量１，３００ｋｃａｌ／ｈが一定であるとすれば、温水温度が外気とほぼ同じ温度になるまで降下するのに２，０００×（６０－５）／１，３００＝８４．６時間かかることになる。ここで、ディーゼルエンジン（船舶用エンジン５）を起動させるために天然ガス燃料が気化供給できるように熱媒容器２１内の温水温度を上げて準備しようとすれば、上述の特許文献２に示されているように温水循環ラインにヒータを取り付けなければならない。このとき、熱媒容器２１内の２ｍ3の温水の温度を５℃から６０℃まで上昇させるためには、温水を熱放散させながら加熱する必要がある。このため、温水ポンプを動かして温水を循環させながら、熱媒容器２１での放散熱量１，３００ｋｃａｌ／ｈの２倍の加熱量２，６００ｋｃａｌ／ｈが必要であり、温度降下と同じ８４．６時間かかることになる。 If the heater is not provided in the heat medium container 21 (comparative example), for example, the amount of heat dissipated from the heat medium container 21 at 5 ° C. in winter is 1,300 kcal / h, so the heat medium container 21 has a capacity of 2 m 3 . If the hot water stays at 60 ° C, even if the hot water temperature changes simply, if the amount of heat dissipated is 1,300 kcal / h, it will drop until the hot water temperature is about the same as the outside air. 2,000 × (60−5) /1,300=84.6 hours. Here, if it is going to prepare by raising the hot water temperature in the heat-medium container 21 so that natural gas fuel can be vaporized and supplied in order to start a diesel engine (ship engine 5), it is shown by the above-mentioned patent document 2. The heater must be installed in the hot water circulation line. At this time, in order to raise the temperature of 2 m 3 of hot water in the heat medium container 21 from 5 ° C. to 60 ° C., it is necessary to heat the hot water while dissipating the heat. For this reason, while operating the hot water pump to circulate the hot water, a heat amount 2,600 kcal / h that is twice the amount of heat dissipated 1,300 kcal / h in the heat medium container 21 is required, which is the same as the temperature drop 84.6. It will take time.
　これに対し、熱媒容器２１に本発明の実施形態に係るヒータが設けられている場合（実施例）、冬季５℃での熱媒容器２１からの放散熱量は１，３００ｋｃａｌ／ｈであるので、ディーゼルエンジン（船舶用エンジン５）が停止したと同時に上記放散熱量と同等の１，３００ｋｃａｌ／ｈ＝１．５ｋｗのヒータ加熱を熱媒容器２１におこなっておれば、例え温水ポンプも停止して温水が循環されていなくても、熱媒容器２１内の温度は低下しない。温水循環ライン（熱媒ライン６２，６３）の配管内の温水量は熱媒容器２１内の温水量と比較して３０分の１と小さいので無視すれば、１．５ｋｗのヒータで常にエンジン起動の準備ができていることになる。 On the other hand, when the heater according to the embodiment of the present invention is provided in the heat medium container 21 (Example), the amount of heat dissipated from the heat medium container 21 at 5 ° C. in winter is 1,300 kcal / h. If the heater of 1,300 kcal / h = 1.5 kw, which is equivalent to the amount of heat dissipated, is heated at the same time as the diesel engine (ship engine 5) is stopped, the hot water pump is also stopped. Even if hot water is not circulated, the temperature in the heat medium container 21 does not decrease. The amount of hot water in the hot water circulation line (heat medium lines 62, 63) is 1 / 30th of the amount of hot water in the heat medium container 21, so if ignored, the engine is always started with a 1.5kw heater. Will be ready.
　以上、本発明の実施形態を説明したが、本発明の範囲は上記した実施形態に限定されるものではなく、各請求項に記載した事項の範囲内でのあらゆる変更は、すべて本発明の範囲に包摂される。 Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in the claims are all within the scope of the present invention. Is included.
Ｘ１　　　　　天然ガス燃料供給システム
１　　　　　　ＬＮＧ貯槽
１１　　　　　外槽
１２　　　　　内槽
１３　　　　　真空断熱層
２　　　　　　気化器
２１　　　　　熱媒容器
２１１　　　　底板
２１２　　　　容器体
２１３　　　　フランジ
２２　　　　　伝熱管
２３　　　　　伝熱管
２４　　　　　オーバーフロー管
２５　　　　　シースヒータ（加熱手段）
２５１　　　　キャップ
２５２　　　　フランジ
２６　　　　　電源部（加熱手段）
２７　　　　　温度検知部（加熱手段）
２８　　　　　保温材
２９　　　　　オートトレースヒータ（加熱手段）
２９１　　　　導線
２９２　　　　発熱抵抗体
２９３　　　　外装被覆材
２０１　　　　電源部
２０２　　　　温度センサ
２０３　　　　サーモスタット
３　　　　　　バッファタンク
４　　　　　　エンジンジャケット
５　　　　　　船舶用エンジン
５１　　　　　シリンダ
５１１　　　　吸気口
５１２　　　　排気口
５２　　　　　副燃焼室
５３　　　　　ピストン
５４　　　　　クランク
６１　　　　　ＬＮＧ供給ライン
６１１　　　　遮断弁
６２　　　　　熱媒ライン
６３　　　　　熱媒ライン
６３１　　　　循環用ポンプ
６４　　　　　ガスライン
６４１　　　　遮断弁
６５　　　　　ガスライン
６５１　　　　圧力制御弁
６６　　　　　ＬＮＧ供給ライン
６６１　　　　遮断弁
６７　　　　　ガスライン
６７１　　　　圧力制御弁 X1 Natural gas fuel supply system 1 LNG storage tank 11 Outer tank 12 Inner tank 13 Vacuum heat insulating layer 2 Vaporizer 21 Heat medium container 211 Bottom plate 212 Container body 213 Flange 22 Heat transfer pipe 23 Heat transfer pipe 24 Overflow pipe 25 Sheath heater (heating means)
251 Cap 252 Flange 26 Power supply (heating means)
27 Temperature detector (heating means)
28 Thermal insulation material 29 Auto trace heater (heating means)
291 Conductor 292 Heating resistor 293 Exterior covering material 201 Power supply unit 202 Temperature sensor 203 Thermostat 3 Buffer tank 4 Engine jacket 5 Marine engine 51 Cylinder 511 Intake port 512 Exhaust port 52 Subcombustion chamber 53 Piston 54 Crank 61 LNG supply line 611 Shut off Valve 62 Heat medium line 63 Heat medium line 631 Circulation pump 64 Gas line 641 Shut-off valve 65 Gas line 651 Pressure control valve 66 LNG supply line 661 Shut-off valve 67 Gas line 671 Pressure control valve

Claims (13)

  1. 　天然ガスを燃料とする燃焼装置の排熱を液体熱媒により回収し、液化天然ガスを上記液体熱媒で加熱して気化させる気化器であって、
    　上記液体熱媒が補充可能に収容される熱媒容器と、
    　当該熱媒容器の内部に配置され、液化天然ガスが流れる伝熱管と、
    　上記熱媒容器に取り付けられ、上記熱媒容器の内部の上記液体熱媒を加熱するための加熱手段と、を備える、液化天然ガス用気化器。     A vaporizer that recovers exhaust heat of a combustion device using natural gas as a fuel by a liquid heat medium, and heats and vaporizes the liquefied natural gas with the liquid heat medium,
    A heating medium container in which the liquid heating medium is replenished, and
    A heat transfer tube disposed inside the heat transfer medium container and through which liquefied natural gas flows;
    A vaporizer for liquefied natural gas, comprising: a heating means attached to the heat medium container and for heating the liquid heat medium inside the heat medium container.
  2. 　上記加熱手段は、上記燃焼装置の停止時において、上記熱媒容器の内部の上記液体熱媒を、外部への放散熱量と同等以上の加熱速度で加熱調節する、請求項１に記載の液化天然ガス用気化器。 2. The liquefied natural product according to claim 1, wherein the heating unit heat-adjusts the liquid heat medium inside the heat medium container at a heating rate equal to or greater than the amount of heat dissipated to the outside when the combustion apparatus is stopped. Gas vaporizer.
  3. 　上記加熱手段は、少なくとも上記燃焼装置の停止時における一部の時間において稼働する、請求項１または２に記載の液化天然ガス用気化器。 The liquefied natural gas vaporizer according to claim 1 or 2, wherein the heating means operates at least during a part of time when the combustion apparatus is stopped.
  4. 　上記加熱手段は、シースヒータを含んでいる、請求項１ないし３のいずれかに記載の液化天然ガス用気化器。 The liquefied natural gas vaporizer according to any one of claims 1 to 3, wherein the heating means includes a sheath heater.
  5. 　上記加熱手段は、上記熱媒容器の内部の上記液体熱媒の温度を検知する温度検知部と、当該温度検知部による検知結果に応じて上記シースヒータの稼働を制御する電源部と、を含む、請求項４に記載の液化天然ガス用気化器。 The heating means includes a temperature detection unit that detects the temperature of the liquid heat medium inside the heating medium container, and a power supply unit that controls the operation of the sheath heater according to a detection result by the temperature detection unit. The vaporizer for liquefied natural gas according to claim 4.
  6. 　上記加熱手段は、オートトレースヒータを含んでいる、請求項１ないし３のいずれかに記載の液化天然ガス用気化器。 The liquefied natural gas vaporizer according to any one of claims 1 to 3, wherein the heating means includes an auto trace heater.
  7. 　上記加熱手段は、上記オートトレースヒータへ電力を供給するための電源部と、上記熱媒容器の外表面の温度を測定し、当該測定温度に応じて上記電源部による電力供給のオン・オフを制御する温度調節部と、を含む、請求項６に記載の液化天然ガス用気化器。 The heating means measures the temperature of the power supply unit for supplying power to the auto trace heater and the outer surface of the heating medium container, and turns on / off the power supply by the power supply unit according to the measured temperature. The liquefied natural gas vaporizer according to claim 6, further comprising a temperature adjusting unit to be controlled.
  8. 　上記オートトレースヒータは、発熱量を自己制御しながら上記熱媒容器の内部の上記液体熱媒を、外部への放散熱量と同等以上の加熱速度で加熱調節する、請求項６または７に記載の液化天然ガス用気化器。 The said auto trace heater controls the heating of the said liquid heat medium inside the said heat-medium container at the heating rate equivalent to or more than the amount of heat | fever dissipated outside, self-controlling the emitted-heat amount. A vaporizer for liquefied natural gas.
  9. 　燃焼装置としての船舶用エンジンと、
    　液化天然ガスを貯蔵するＬＮＧ貯槽と、
    　請求項１ないし８のいずれかに記載の液化天然ガス用気化器と、
    　上記船舶用エンジンの排熱を上記液体熱媒により回収するための熱回収部と、
    　上記熱回収部と上記気化器との間で上記液体熱媒を循環させる熱媒ラインと、
    　上記ＬＮＧ貯槽から上記伝熱管を経由して気化された天然ガスを上記船舶用エンジンに供給するための配管と、を備える、天然ガス燃料供給システム。     A marine engine as a combustion device;
    An LNG storage tank for storing liquefied natural gas;
    A vaporizer for liquefied natural gas according to any one of claims 1 to 8,
    A heat recovery unit for recovering exhaust heat of the marine engine by the liquid heat medium;
    A heating medium line for circulating the liquid heating medium between the heat recovery unit and the vaporizer;
    A natural gas fuel supply system comprising: a pipe for supplying natural gas vaporized from the LNG storage tank via the heat transfer pipe to the marine engine.
  10. 　上記加熱手段は、上記船舶用エンジンの停止時において、上記熱媒容器の内部の上記液体熱媒を、外部への放散熱量と同等以上の加熱速度で加熱調節する、請求項９に記載の天然ガス燃料供給システム。 The natural heating according to claim 9, wherein the heating means heat-adjusts the liquid heat medium inside the heat medium container at a heating rate equal to or greater than the amount of heat dissipated to the outside when the marine engine is stopped. Gas fuel supply system.
  11. 　上記熱媒容器は、内部に前記伝熱管とは別に設けられた第２の伝熱管を備えており、上記第２の伝熱管は追加の配管を介して上記ＬＮＧ貯槽に気化された天然ガスの一部を戻り供給して、上記ＬＮＧ貯槽の内部圧力を調整するように構成されている、請求項９又は１０に記載の天然ガス燃料供給システム。 The heat transfer medium container includes a second heat transfer tube provided therein separately from the heat transfer tube, and the second heat transfer tube contains natural gas vaporized in the LNG storage tank via an additional pipe. The natural gas fuel supply system according to claim 9 or 10, wherein a part of the LNG storage tank is configured to be supplied by returning a part thereof to adjust the internal pressure of the LNG storage tank.
  12. 　請求項９～１１のいずれかに記載の天然ガス燃料供給システムを運転する方法であって、
    　上記船舶用エンジンの運転中は上記加熱装置による加熱を停止し、
    　上記船舶用エンジンが停止中に上記加熱装置による加熱を行うようにする、方法。     A method for operating a natural gas fuel supply system according to any of claims 9 to 11, comprising
    During operation of the marine engine, heating by the heating device is stopped,
    A method of heating by the heating device while the marine engine is stopped.
  13. 　請求項９～１１のいずれかに記載の天然ガス燃料供給システムを運転する方法であって、
    　上記熱媒容器内の液体熱媒が所定温度以上の場合は上記加熱装置による加熱を停止し、
    　上記熱媒容器内の液体熱媒が前記所定温度未満に下降した場合は上記加熱装置による加熱を行うようにする、方法。     A method for operating a natural gas fuel supply system according to any of claims 9 to 11, comprising
    If the liquid heat medium in the heat medium container is above a predetermined temperature, stop heating by the heating device,
    A method in which heating by the heating device is performed when the liquid heat medium in the heat medium container falls below the predetermined temperature.
PCT/JP2017/014761 2016-04-22 2017-04-11 Liquefied natural gas vaporizer, natural gas fuel supply system provided with same, and method for operating natural gas fuel supply system WO2017183510A1 (en)

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JP2021502517A (en) * 2017-11-10 2021-01-28 ２４７ エネルジー ベーフェーベーアー Compact power generator
JP2021536548A (en) * 2018-09-10 2021-12-27 テーゲーエー、マリン、ガス、エンジニヤリング、ゲーエムベーハー Assembly that evaporates liquefied gas to provide combustion gas to the engine

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JPH07225010A (en) * 1994-02-15 1995-08-22 Nippon Oil Co Ltd Burner
JP2015147508A (en) * 2014-02-06 2015-08-20 新潟原動機株式会社 Liquefied gas supply device of ship propulsion gas fuel engine

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JPH07225010A (en) * 1994-02-15 1995-08-22 Nippon Oil Co Ltd Burner
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JP2021502517A (en) * 2017-11-10 2021-01-28 ２４７ エネルジー ベーフェーベーアー Compact power generator
JP7307082B2 (en) 2017-11-10 2023-07-11 ２４７ エネルジー ベーフェーベーアー compact generator
JP2021536548A (en) * 2018-09-10 2021-12-27 テーゲーエー、マリン、ガス、エンジニヤリング、ゲーエムベーハー Assembly that evaporates liquefied gas to provide combustion gas to the engine
JP7212149B2 (en) 2018-09-10 2023-01-24 テーゲーエー、マリン、ガス、エンジニヤリング、ゲーエムベーハー An assembly that evaporates liquefied gas to provide combustion gases for an engine

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