Engine device

Abstract

The invention provides an engine device which can effectively vaporize low-GHG fuel from a liquid state to ensure combustion stability, wherein the low-GHG fuel discharges little greenhouse effect gas such as ammonia and methanol, while suppressing the use of external energy. An engine device (1) that drives an engine (2) by supplying a low GHG fuel having a small amount of global warming gas emission is provided with a liquid fuel container (30) as a reservoir in which a liquid fuel is stored, and the fuel supplied from the liquid fuel container (30) to the engine (2) is gasified by waste heat from the engine (2).

Description

Technical Field

[0001] The present invention relates to an engine device that drives an engine by vaporizing a low-GHG fuel such as ammonia or methanol, which emits relatively little greenhouse gases, from a liquid state and supplying the gas to the engine. Background Art

[0002] Conventionally, some engine systems use a structure that supplies low-GHG fuels such as ammonia and methanol, which emit relatively low greenhouse gases, to the engine for driving. For example, the engine system stores liquid fuel and injects the liquid fuel from a nozzle into a flow path connected to the engine or into the engine's combustion chamber, thereby supplying the fuel to the combustion chamber. However, in structures that inject liquid ammonia into the combustion chamber through a nozzle, the ammonia is sometimes heated and vaporized midway in the fuel piping, particularly near the combustion chamber. This partially vaporizes the fuel, causing instability in the fuel flow rate injected from the nozzle or changes in the spray pattern of the fuel injected from the nozzle, resulting in poor mixing with air. Therefore, it is necessary to maintain the ammonia injected from the nozzle in a liquid state.

[0003] In contrast, Patent Document 1 discloses an internal combustion engine using ammonia as fuel, comprising: a container for storing liquid ammonia; a pressure-boosting device for increasing the pressure of ammonia flowing from the container; a nozzle for injecting the ammonia, pressurized by the pressure-boosting device, into the combustion chamber of the internal combustion engine or an intake passage connected to the combustion chamber; and a fuel pipe for supplying ammonia from the container to the nozzle via the pressure-boosting device. This internal combustion engine cools the fuel pipe from the outside by allowing ammonia, diverted from the container or the fuel pipe, to flow outside the fuel pipe, utilizing the latent heat of vaporization generated by the evaporation of the ammonia.

[0004] In addition, regarding engine devices that supply fuel such as ammonia to the engine, there is a structure such as the ammonia engine system disclosed in Patent Document 2, which includes: an ammonia storage tank that stores liquid ammonia; and a vaporizer that vaporizes the liquid ammonia stored in the ammonia storage tank to generate ammonia gas, and supplies the ammonia gas to the ammonia engine.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2021-173166

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 2023-036178 Summary of the Invention

[0009] As described above, in engine systems that supply ammonia or other fuels to an engine, when ammonia is injected as a liquid from a nozzle, the mixed gas between the liquid fuel and air tends to be more nonuniform than when injected as a gas. Furthermore, injecting the fuel as a liquid requires atomization and evaporation of the droplets, making mixing more complex than when injecting a gas.

[0010] In diesel engines, lower air temperatures improve combustion, leading to higher output. However, when using flame-retardant ammonia as a fuel, a mixture must be supplied to the engine's combustion chamber at a temperature above a certain level for stable combustion. As in Patent Document 1, a structure that utilizes the latent heat of vaporization of ammonia to cool the fuel piping lowers the temperature of the mixture due to the latent heat of vaporization. This causes a problem: the ammonia supplied to the engine's combustion chamber becomes difficult to burn, making stable combustion difficult.

[0011] In addition, when a method of injecting gas is used instead of a method of injecting ammonia or other fuel using liquid, the above-mentioned Patent Document 2 includes a vaporizer for vaporizing liquid ammonia to generate ammonia gas, but the energy for vaporizing the liquid ammonia is not disclosed, and the structure may become complicated due to the use of external energy.

[0012] An object of the present invention is to provide an engine device capable of efficiently vaporizing a low-GHG fuel such as ammonia or methanol, which emits relatively little greenhouse gases, from a liquid state while suppressing the use of external energy, thereby ensuring combustion stability.

[0013] To solve the above problems, the engine device of the present invention supplies fuel to drive an engine, and is characterized in that the engine device includes a storage portion for storing the fuel in a liquid state, and utilizes waste heat from the engine to vaporize the fuel supplied from the storage portion to the engine.

[0014] Effects of the Invention

[0015] According to the present invention, an engine device is provided that can efficiently vaporize a low-GHG fuel such as ammonia or methanol, which emits relatively little greenhouse gases, from a liquid state while suppressing the use of external energy, thereby ensuring combustion stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram showing an example of an engine device according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram showing another example of the engine device according to the embodiment of the present invention.

[0018] Description of Reference Numerals

[0019] 1…engine device; 2…engine; 3…intake passage; 4…exhaust passage; 5…supercharger; 5a…turbine; 5b…compressor; 6…intercooler; 7…fuel supply mechanism; 8…ignition device; 9…control unit; 11…cylinder block; 12…cylinder; 12a…combustion chamber; 13…cylinder block; 14…piston; 15…cylinder head; 16…connecting rod; 17…crankshaft; 18…intake port; 19…exhaust port; 20…intake valve; 21…exhaust valve; 22…intake manifold; 22a…branch flow path; 23…exhaust manifold; 23a…branch flow path; 30…liquid fuel container; 31…liquid fuel flow path; 32…vaporization section; 33…gas fuel flow path; 34…heat insulation section; 35…fuel supply section; 36…vaporizer; 37…heat exchanger DETAILED DESCRIPTION

[0020] An engine device 1 according to an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, the engine device 1 includes an engine 2 , an intake passage 3 , an exhaust passage 4 , a supercharger 5 , an intercooler 6 , a fuel supply mechanism 7 , an ignition device 8 , and a control unit 9 .

[0021] In this embodiment, the engine device 1 is particularly configured to vaporize a low-GHG fuel such as ammonia or methanol, which emits relatively low amounts of greenhouse gases, from a liquid state, and supply the fuel to the combustion chamber 12a of each cylinder 12 of the engine 2 using the fuel supply portion 35 of the fuel supply mechanism 7. Furthermore, the engine device 1 is configured to drive the engine 2 by combusting a mixture of the low-GHG fuel and air in the combustion chamber 12a.

[0022] The engine 2 is configured such that a plurality of cylinders 12 are provided in a cylinder block 11. Figure 1 Only one cylinder 12 is shown. Figure 1 As shown, each cylinder 12 is composed of a cylinder block 13 , a piston 14 and a cylinder head 15 .

[0023] The cylinder 13 is formed in a cylindrical shape, for example, within the cylinder block 11, and the piston 14 is slidably accommodated within the cylinder 13. The cylinder head 15 is mounted on the upper side of the cylinder 13, and the cylinder 13 and the cylinder head 15 form a combustion chamber 12a inside.

[0024] Below the cylinder 13 , a crankshaft 17 is connected to the piston 14 via a connecting rod 16 , and the reciprocating motion of the piston 14 is converted into rotational motion of the crankshaft 17 via the connecting rod 16 .

[0025] The cylinder head 15 has an intake port 18 and an exhaust port 19 communicating with the combustion chamber 12a of the cylinder block 13, and includes an intake valve 20 and an exhaust valve 21 for opening and closing the intake port 18 and the exhaust port 19, respectively, with respect to the combustion chamber 12a.

[0026] The intake port 18 is connected to the intake passage 3 and introduces air supplied from the intake passage 3 into the combustion chamber 12a. The exhaust port 19 is connected to the exhaust passage 4 and discharges exhaust gas generated in the combustion chamber 12a into the exhaust passage 4. The intake valve 20 is opened to allow a mixture of fuel gas and air to be drawn into the combustion chamber 12a via the intake port 18. On the other hand, the exhaust valve 21 is opened to allow exhaust gas generated in the combustion chamber 12a to be discharged via the exhaust port 19.

[0027] In addition, Figure 1 , in order to connect the intake passage 3 to the intake ports 18 of the plurality of cylinders 12, an intake manifold 22 having branched flow paths 22a branching from the intake passage 3 to the plurality of cylinders 12 is provided between the intake passage 3 and the engine 2, or the intake passage 3 and the intake ports 18 may be directly connected. Figure 1 The following example is shown: when the exhaust passage 4 and the exhaust ports 19 of multiple cylinders 12 are connected, an exhaust manifold 23 having a branch flow path 23a branching from the exhaust passage 4 to the multiple cylinders 12 is arranged between the exhaust passage 4 and the engine 2, or the exhaust passage 4 and the exhaust port 19 can be directly connected.

[0028] The intake passage 3 allows compressed and cooled air to flow in the intake direction and be supplied to each cylinder 12 of the engine 2 through the intake port 18 thereof. The exhaust passage 4 allows exhaust gas generated in each cylinder 12 of the engine 2 and discharged through the exhaust port 19 to flow in the exhaust direction and be discharged. A supercharger 5 and an intercooler 6 are provided in this order in the intake passage 3 from the upstream side in the intake direction. In addition, an air filter (not shown) may be provided at the upstream end of the intake passage 3 in the intake direction to purify and introduce fresh air.

[0029] The supercharger 5 compresses the air flowing through the intake passage 3 and delivers it downstream in the intake direction. The intercooler 6 cools the air compressed by the supercharger 5. The supercharger 5 includes a turbine 5a and a compressor 5b. The turbine 5a is located in the exhaust passage 4, and the compressor 5b is located in the intake passage 3. Exhaust gas flowing through the exhaust passage 4 rotates the turbine 5a, and the rotational force of the turbine 5a drives the compressor 5b, thereby compressing the air flowing through the intake passage 3.

[0030] The fuel supply mechanism 7 vaporizes the low GHG fuel from a liquid state and supplies it to the combustion chamber 12a of each cylinder 12 of the engine 2. The fuel supply mechanism 7 includes a liquid fuel container 30, a liquid fuel flow path 31, a vaporization unit 32, a gas fuel flow path 33, a heat retaining unit 34, and a fuel supply unit 35.

[0031] The liquid fuel container 30 is a storage unit for storing low-GHG fuel in a liquid state. The liquid fuel flow path 31 connects the liquid fuel container 30 and the vaporizer 32. The liquid fuel is supplied from the liquid fuel container 30 to the vaporizer 32 via the liquid fuel flow path 31 by a pump (not shown).

[0032] The vaporization unit 32 vaporizes the low-GHG fuel in a liquid state supplied from the liquid fuel container 30 to the engine 2 using exhaust heat from the engine 2. The vaporization unit 32 includes, for example, a vaporizer 36 and a heat exchanger 37.

[0033] The vaporizer 36 is connected to the liquid fuel flow path 31 and the gas fuel flow path 33. It vaporizes the liquid low-GHG fuel flowing from the liquid fuel flow path 31 and flows the vaporized gaseous low-GHG fuel through the gas fuel flow path 33. The heat exchanger 37 flows a heat exchange medium, and also flows exhaust gas from the engine 2 or cooling water after or before heat exchange in the intercooler 6. This heat exchange medium is heated using the exhaust heat from the engine 2. The heat exchanger 37 then supplies the heated heat exchange medium to the vaporizer 36, which uses the heat exchange medium to heat and vaporize the liquid low-GHG fuel.

[0034] The gas fuel flow path 33 is connected to the vaporizer 36 and the fuel supply unit 35 , and gaseous fuel is supplied from the vaporizer 36 to the fuel supply unit 35 via the gas fuel flow path 33 .

[0035] The heat-insulating section 34 insulates the low-GHG fuel vaporized by the vaporizing section 32 to maintain its gaseous state. The heat-insulating section 34 is constructed, for example, by forming a portion of the gas fuel flow path 33 into a double-pipe configuration. The double-pipe heat-insulating section 34 includes a first pipe that allows the gas fuel to flow, and a second pipe that allows a heat-insulating medium to flow through the outer surface of the first pipe, thereby heating and insulating the gas fuel with the heat-insulating medium. For example, as with the vaporizer 36, the heat-insulating section 34 may allow the heat exchange medium heated by the heat exchanger 37 to flow, or the heat exchange medium after or before passing through the vaporizer 36 to flow, or, similarly to the heat exchanger 37, the heat-insulating section 34 may allow the exhaust heat from the engine 2 to flow, or the exhaust heat after or before passing through the heat exchanger 37 to flow.

[0036] Alternatively, the heat-retaining portion 34 may be configured to retain the gas fuel using an electric heating device, such as a tape heater, wrapped around the outer surface of a portion of the gas fuel flow path 33. Alternatively, the gas fuel may be retained using a heat-insulating structure or heat-insulating treatment provided in a portion of the gas fuel flow path 33. Furthermore, the heat-retaining temperature of the heat-retaining portion 34 may be set to a temperature equal to or higher than the vaporization temperature of the vaporization portion 32, or may be set to a temperature lower than the vaporization temperature of the vaporization portion 32 as long as the gas fuel does not reliquefy.

[0037] The base end of the fuel supply unit 35 is connected to the gas fuel flow path 33, and supplies a gaseous low-GHG fuel flowing from the gas fuel flow path 33 to the combustion chamber 12a of each cylinder 12 of the engine 2. The fuel supply unit 35 is composed of, for example, an intake valve and a gas injector that inject the gas fuel. The fuel supply unit 35 is controlled by the control unit 9 in terms of injection pressure, injection timing, etc. of the gas fuel.

[0038] exist Figure 1 , an example is shown in which a fuel supply unit 35 is provided upstream of the intake manifold 22 in the intake direction to supply gaseous fuel, which is a low-GHG fuel, to the intake passage 3. A mixture of air supplied from the intake passage 3 and the gaseous fuel supplied from the fuel supply unit 35 is supplied to the combustion chamber 12a of each cylinder 12.

[0039] The fuel supply portion 35 may be provided to supply the gaseous fuel to the intake passage 3 at a position upstream of the branching position to the plurality of cylinders 12 in the intake direction, or may be provided to supply the gaseous fuel to the intake passage 3 for each cylinder 12 at a position downstream of the branching position to the plurality of cylinders 12. Alternatively, the fuel supply portion 35 may be provided to supply the gaseous fuel to each branching flow path 22a of the intake manifold 22 in order to supply the gaseous fuel to each cylinder 12, or may be provided to supply the gaseous fuel to each intake port 18, or may be provided to supply the gaseous fuel directly to each combustion chamber 12a.

[0040] In addition, a portion or all of at least one of the intake passage 3, the intake manifold 22 and the intake port 18 can be constructed as follows: at a position where the fuel supply portion 35 is provided, that is, at a position further downstream in the intake direction than the position where the gas fuel is supplied, in order to maintain the gas state of the fuel, it has the same insulation structure as the insulation portion 34.

[0041] Specifically, the intake passage 3, intake manifold 22, and intake port 18 are constructed as a dual piping system, comprising a first piping system for circulating a mixture of gaseous fuel and air, and a second piping system for circulating a heat-insulating medium on the outer surface of the first piping system, which heats the mixture and maintains the fuel in a gaseous state. For example, the heat-insulating medium may be a heat exchange medium heated by a heat exchanger 37 or a heat exchange medium that has passed through or has passed through the carburetor 36, similarly to the carburetor 36. Alternatively, the heat exchanger 37 may be configured to circulate exhaust heat from the engine 2 or exhaust heat that has passed through or has passed through the heat exchanger 37, similarly to the carburetor 36.

[0042] Alternatively, the intake passage 3 , the intake manifold 22 , and the intake port 18 may heat the mixed gas using an electric heating device such as a tape heater wrapped around the outer surface, or may heat the mixed gas using a heat insulation structure or heat insulation treatment.

[0043] An ignition device 8 is provided for each cylinder 12 and ignites the fuel within the combustion chamber 12a of each cylinder 12. The ignition device 8 may be a spark ignition system utilizing a spark plug, or a micro-pilot system that injects a small amount of liquid fuel. Alternatively, the ignition device 8 may be a system that compresses and ignites a mixture of gaseous fuel and liquid fuel. The ignition timing and other aspects of the ignition device 8 are controlled by a control unit 9.

[0044] The control unit 9 is a computer such as an ECU (Engine Control Unit) that controls the operation of the engine 2. It includes a CPU, ROM, RAM, etc., and is configured to control various components of the engine 2. The control unit 9 can store various programs for controlling the engine 2 and control the engine 2 by reading and executing the programs.

[0045] As described above, according to this embodiment, the engine device 1 is an engine device 1 that drives the engine 2 by supplying a low-GHG fuel having low greenhouse gas emissions, and is provided with a liquid fuel container 30 as a storage portion for storing fuel in a liquid state, and utilizes waste heat from the engine 2 to vaporize the fuel supplied from the liquid fuel container 30 to the engine 2.

[0046] Specifically, engine device 1 utilizes heat from the exhaust gas of engine 2 and / or heat from the coolant used to cool engine 2 as exhaust heat from the engine. Furthermore, engine device 1 is equipped with a vaporizer that utilizes exhaust heat from engine 2 to vaporize fuel supplied from a liquid fuel tank 30 to engine 2. Furthermore, engine device 1 utilizes ammonia or methanol as a low-GHG fuel.

[0047] Thus, the engine device 1 utilizes waste heat exhausted from the engine 2 , and therefore can efficiently vaporize the fuel from a liquid state without using external energy, thereby ensuring combustion stability.

[0048] Furthermore, according to the present embodiment, the engine device 1 maintains the vaporized fuel in a gaseous state using the waste heat from the engine 2 .

[0049] Thus, the engine device 1 can suppress reliquefaction of the vaporized fuel and deterioration of mixing due to injection of a two-phase fluid of the reliquefied fuel and the vaporized fuel, thereby ensuring combustion stability.

[0050] The engine device 1 is configured such that a portion or the entirety of a flow path of fuel flowing from the liquid fuel container 30 to the engine 2 includes a heat insulating structure or heat insulating treatment.

[0051] Thus, the engine device 1 can suppress reliquefaction of the vaporized fuel and deterioration of mixing due to injection of a two-phase fluid of the reliquefied fuel and the vaporized fuel, thereby ensuring combustion stability.

[0052] Furthermore, in the above embodiment, an example is described in which the heat exchanger 37 of the vaporizer 32 of the engine device 1 utilizes exhaust heat from the engine 2 (e.g., exhaust gas discharged from the engine 2 or cooling water after or before heat exchange in the intercooler 6) to heat a heat exchange medium, and the vaporizer 36 utilizes this heat exchange medium to heat the liquid low-GHG fuel, thereby indirectly utilizing the exhaust heat from the engine 2 to vaporize the fuel. However, the present invention is not limited to this example. In other examples, the vaporizer 32 may not include the heat exchanger 37, and the vaporizer 36 may be configured to directly utilize the exhaust heat from the engine 2 to heat and vaporize the liquid low-GHG fuel.

[0053] In addition, in the above embodiment, the following example is described: after the fuel supply mechanism 7 of the engine device 1 vaporizes the liquid low-GHG fuel using the vaporizer 36, the fuel supply unit 35 supplies the gaseous low-GHG fuel to the combustion chamber 12a of each cylinder 12 of the engine 2, but the present invention is not limited to this example.

[0054] In other examples, the fuel supply mechanism 7 can be configured as follows: Figure 2As shown, the vaporizer 36 is not provided, and the fuel supply unit 35 supplies low-GHG fuel in a liquid state toward the combustion chamber 12a of each cylinder 12 of the engine 2. The vaporization unit 32 utilizes waste heat from the engine 2 (for example, exhaust gas discharged from the engine 2 or cooling water after or before heat exchange in the intercooler 6) at a position further downstream in the intake direction than the position where the liquid fuel is supplied to heat a part or all of at least one of the intake passage 3, the intake manifold 22, and the intake port 18, thereby vaporizing the liquid fuel.

[0055] For example, the heat exchanger 37 may utilize exhaust heat from the engine 2 to heat the heat exchange medium, and the vaporizer 32 may utilize this heat exchange medium to heat the intake passage 3, the intake manifold 22, or the intake port 18, thereby indirectly utilizing the exhaust heat from the engine 2 to vaporize the fuel. Alternatively, the vaporizer 32 may be configured without the heat exchanger 37 and directly utilize the exhaust heat from the engine 2 to heat the intake passage 3, the intake manifold 22, or the intake port 18 to vaporize the liquid fuel.

[0056] According to this embodiment, the engine device 1 includes an intake manifold 22 for supplying air to the engine 2. The intake manifold 22 is heated using exhaust heat from the engine 2, thereby vaporizing the fuel supplied from the liquid fuel container 30 to the engine 2 or maintaining the vaporized fuel in a gaseous state.

[0057] As a result, the engine device 1 can use the intake manifold 22 as the carburetor 36 and the heat insulating portion 34 , thereby achieving a reduction in the number of components and a reduction in cost.

[0058] In the above embodiment, an example is described in which the vaporization unit 32 of the engine device 1 can employ not only the vaporizer 36 utilizing exhaust heat from the engine 2 but also the intake passage 3, intake manifold 22, or intake port 18 utilizing exhaust heat from the engine 2 as a mechanism for vaporizing the liquid low-GHG fuel. However, the present invention is not limited to this example. In other embodiments, the vaporization unit 32 may include a mechanism such as an additional heater utilizing external energy in addition to the vaporizer 36 utilizing exhaust heat from the engine 2, the intake passage 3, intake manifold 22, or intake port 18 utilizing exhaust heat from the engine 2.

[0059] The additional heater is controlled to heat and stop by the control unit 9. The additional heater may be provided in the liquid fuel flow path 31, the gas fuel flow path 33, the vaporizer 36, the fuel supply unit 35, or the intake passage 3, the intake manifold 22, or the intake port 18.

[0060] The control unit 9 controls the activation and deactivation of the additional heater based on the operating conditions and operating environment of the engine unit 1. For example, when the engine 2 is started, the exhaust heat from the engine 2 (e.g., the exhaust gas discharged from the engine 2 or the cooling water in the intercooler 6 after or before heat exchange) has not yet reached a temperature sufficient to fully vaporize the liquid low-GHG fuel. Therefore, the control unit 9 activates the additional heater during the startup of the engine 2. Alternatively, the control unit 9 may determine that the engine 2 is started from the time a predetermined time has passed since the start of the engine 2, or until the exhaust gas discharged from the engine 2 or the cooling water in the intercooler 6 after or before heat exchange reaches a predetermined temperature.

[0061] According to another embodiment, the engine device 1 includes an additional heater for heating the fuel supplied from the liquid fuel tank 30 to the engine 2 in order to vaporize the fuel when the engine 2 is started.

[0062] Therefore, regarding the engine device 1, under the operating conditions and operating environment of the engine device 1 where the waste heat from the engine 2 cannot be used to vaporize the liquid fuel or keep the gas fuel warm, it is possible to switch to the operation of the additional heater to vaporize the liquid fuel or keep the gas fuel warm.

[0063] Furthermore, the present invention may be modified as appropriate within the scope not departing from the gist or concept of the invention as reflected in the claims and the entire specification, and engine devices with such modifications are also encompassed within the technical concept of the present invention.

[0064] [Supplementary Notes on the Invention]

[0065] The following is a supplementary note on the outline of the invention extracted from the above embodiments. In addition, the various structures and processing functions described in the following supplementary notes can be selected and combined arbitrarily.

[0066] Note 1

[0067] An engine device that supplies fuel to drive an engine, characterized in that:

[0068] The engine device includes a storage portion for storing the fuel in a liquid state.

[0069] The fuel supplied from the storage portion to the engine is vaporized using exhaust heat from the engine.

[0070] Note 2

[0071] The engine device according to Supplementary Note 1 is characterized in that:

[0072] The vaporized fuel is maintained in a gaseous state by utilizing waste heat from the engine.

[0073] Note 3

[0074] The engine device according to Supplementary Note 1 or 2 is characterized in that:

[0075] The waste heat from the engine is heat of exhaust gas from the engine and / or heat of a coolant for cooling the engine.

[0076] Note 4

[0077] The engine device according to any one of Supplementary Notes 1 to 3, characterized in that:

[0078] The engine device includes a carburetor that vaporizes the fuel supplied from the storage portion to the engine using exhaust heat from the engine.

[0079] Note 5

[0080] The engine device according to any one of Supplementary Notes 1 to 3, characterized in that:

[0081] The engine device includes an intake manifold for supplying air to the engine.

[0082] The intake manifold is heated using exhaust heat from the engine, thereby vaporizing the fuel supplied from the storage portion to the engine or maintaining the vaporized fuel in a gaseous state.

[0083] <Note 6>

[0084] The engine device according to any one of Supplementary Notes 1 to 5, characterized in that:

[0085] A part or the entirety of the flow path of the fuel flowing from the storage portion to the engine is configured to include a heat insulating structure or heat insulating treatment.

[0086] <Note 7>

[0087] The engine device according to any one of Supplementary Notes 1 to 6, characterized in that:

[0088] The engine device includes a heater that heats the fuel supplied from the storage portion to the engine to vaporize the fuel when the engine is started.

[0089] <Note 8>

[0090] The engine device according to any one of Supplementary Notes 1 to 7, characterized in that:

[0091] The fuel is ammonia or methanol.

Claims

1. An engine device that supplies fuel to drive an engine. It is characterized in that The engine device includes a storage portion for storing the fuel in a liquid state. The fuel supplied from the storage portion to the engine is vaporized using exhaust heat from the engine.

2. The engine device according to claim 1, characterized in that The vaporized fuel is maintained in a gaseous state by utilizing waste heat from the engine.

3. The engine device according to claim 1, characterized in that The waste heat from the engine is heat of exhaust gas from the engine and / or heat of a coolant for cooling the engine.

4. The engine device according to claim 1, characterized in that The engine device includes a carburetor that vaporizes the fuel supplied from the storage portion to the engine using exhaust heat from the engine.

5. The engine device according to claim 1, characterized in that The engine device includes an intake manifold for supplying air to the engine. The intake manifold is heated using exhaust heat from the engine, thereby vaporizing the fuel supplied from the storage portion to the engine or maintaining the vaporized fuel in a gaseous state.

6. The engine device according to claim 1, characterized in that A part or the entirety of the flow path of the fuel flowing from the storage portion to the engine is configured to include a heat insulating structure or heat insulating treatment.

7. The engine device according to claim 1, characterized in that The engine device includes a heater that heats the fuel supplied from the storage portion to the engine to vaporize the fuel when the engine is started.

8. The engine device according to claim 1, characterized in that The fuel is ammonia or methanol.

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