Fuel supply device and engine system

Abstract

The invention provides a fuel supply device and an engine system, which can ensure combustion stability by mixing a main fuel and a combustion improver at a molecular level. The present invention is applied to an engine system (1) provided with an engine (2) that operates using a mixed fuel comprising a main fuel such as ammonia and alcohol and a combustion improver comprising a hydrocarbon liquid fuel such as light oil, lamp oil or heavy oil. A fuel supply device (5) that supplies the mixed fuel to the engine (2) mixes a phase solvent, the main fuel, and the combustion improver to generate the mixed fuel.

Description

Technical Field

[0001] The present invention relates to a fuel supply device for supplying a mixed fuel of a main fuel such as ammonia and a combustion improver composed of a hydrocarbon liquid fuel such as light oil to an engine, and an engine system equipped with the fuel supply device. Background Art

[0002] Conventionally, there are engine systems that operate by supplying a mixed fuel of a main fuel such as ammonia and a combustion aid composed of a hydrocarbon liquid fuel such as light oil to the engine.

[0003] For example, according to Patent Document 1, a device for producing an ammonia mixed fuel comprises: an ammonia storage closed container for storing ammonia in a liquefied state; an oxidant storage closed container for storing an oxidant for assisting the combustion of ammonia; a mixing closed container for mixing ammonia and an oxidant by stirring and mixing them with a stirrer to obtain a mixture, and is configured to maintain a gas-liquid equilibrium state in the mixture obtained by stirring and mixing with the stirrer; an ammonia introduction line, which connects the ammonia storage closed container and the mixing closed container and is provided with an ammonia quantitative introduction mechanism configured to introduce a specified amount of ammonia into the mixing closed container; an oxidant introduction line, which connects the oxidant storage closed container and the mixing closed container and is provided with an oxidant quantitative introduction mechanism configured to introduce a specified amount of oxidant from the oxidant storage closed container into the mixing closed container; and at least one liquid phase discharge line, which is configured to discharge the mixture obtained by stirring and mixing in the mixing closed container by the stirrer from the mixing closed container as an ammonia mixed fuel.

[0004] The manufacturing apparatus of Patent Document 1 is provided with a temperature control mechanism that controls the temperature of the mixture in the sealed mixing container so that the saturated vapor pressure of the mixture is within a temperature range that does not exceed the specified pressure tolerance of the sealed mixing container. Furthermore, the manufacturing apparatus of Patent Document 1 comprises: a surfactant storage container for storing the surfactant; and a surfactant introduction line connecting the surfactant storage container and the sealed mixing container, and provided with a surfactant quantitative introduction mechanism configured to introduce a predetermined amount of surfactant into the sealed mixing container. The surfactant is stirred and mixed with ammonia and an oxidant in the sealed mixing container by a stirrer, and the liquid phase discharge line discharges the mixture containing the surfactant.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2022-171351 Summary of the Invention

[0008] The prior art disclosed in Patent Document 1 uses a surfactant to promote mixing of the main fuel and the combustion aid. However, the surfactant only mixes the main fuel and the combustion aid at a macroscopic level and does not mix them at a molecular level. Therefore, when the mixed fuel containing the main fuel and the combustion aid is burned in an engine using the surfactant, combustion stability may be reduced.

[0009] In addition, regarding the prior art disclosed in Patent Document 1, a temperature regulating mechanism is used to regulate the temperature of the main fuel, the oxidant, or the mixed fuel to maintain the properties of the mixed fuel. However, the main fuel, the oxidant, or the mixed fuel needs to be heated or cooled according to the target temperature. Therefore, the temperature regulating mechanism may become complicated and expensive.

[0010] An object of the present invention is to provide a fuel supply device and an engine system capable of mixing a main fuel and an oxidant at a molecular level to ensure combustion stability.

[0011] To solve the above problems, the fuel supply device of the present invention supplies a mixed fuel of a main fuel and a combustion improver composed of a hydrocarbon liquid fuel to an engine, and is characterized in that a compatibilizer, the main fuel, and the combustion improver are mixed to generate the mixed fuel.

[0012] Furthermore, the engine system of the present invention is characterized by comprising: the above-mentioned fuel supply device; and the engine operated by the mixed fuel.

[0013] Effects of the Invention

[0014] According to the present invention, a fuel supply device and an engine system are provided that can mix a main fuel and an oxidant at a molecular level to ensure combustion stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram showing an example of an engine system according to an embodiment of the present invention.

[0016] Figure 2 This is a graph schematically showing a map indicating the relationship between the mixing ratio of ethanol as a main fuel and diesel as a combustion aid, and the temperature of the mixed fuel.

[0017] Figure 3 This is a graph showing the relationship between the concentration of methanol as the main fuel in the mixed fuel and the concentration of dodecanol as the compatibilizing agent added to completely mix the mixed fuel, for each temperature of the mixed fuel.

[0018] Figure 4 It is a schematic diagram showing another example of the engine system according to the embodiment of the present invention.

[0019] Description of Reference Numerals

[0020] 1…Engine system; 2…Engine; 3…Intake passage; 4…Exhaust passage; 5…Fuel supply device; 12…Cylinder; 12a…Combustion chamber; 18…Intake port; 19…Exhaust port; 22…Intake manifold; 22a…Branch flow path; 23…Exhaust manifold; 23a…Branch flow path; 30…Main fuel container; 30a…Main fuel flow path; 31…Oxygen-supporting agent container; 31a…Oxygen-supporting agent flow path; 32…Compound solvent container; 32a…Compound solvent Flow path; 33…stirring container; 33a…mixed fuel flow path; 33b…mixed fuel pump; 33c…heat insulation unit; 34…stirring machine; 35…mixed fuel injection device; 36…main fuel supply valve; 37…oxidant supply valve; 38…combustible agent supply valve; 40…control device; 40a…supply quantity determination unit; 41…main fuel temperature sensor; 42…oxidant temperature sensor; 43…mixed fuel temperature sensor; 45…fixed mixer. DETAILED DESCRIPTION

[0021] An engine system 1 according to an embodiment of the present invention will be described with reference to the drawings. The engine system 1 includes an engine 2 , an intake passage 3 , an exhaust passage 4 , and a fuel supply device 5 .

[0022] The engine 2 is operated using a mixed fuel consisting of a main fuel such as ammonia or alcohol and a combustion aid consisting of a liquid hydrocarbon fuel such as light oil, kerosene, or heavy oil. For example, the engine 2 may be a diesel engine, but is not limited to a diesel engine as long as it operates using the above-mentioned mixed fuel. Other internal combustion engines (engines) may also be used.

[0023] 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 .

[0024] 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.

[0025] 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 .

[0026] 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.

[0027] 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.

[0028] 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.

[0029] The intake passage 3 allows compressed and cooled air to flow in the intake direction and is supplied to each cylinder 12 of the engine 2 through the intake port 18 of each cylinder 12. 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.

[0030] The fuel supply device 5 supplies a mixed fuel composed of a main fuel and an oxidant to the engine 2. The fuel supply device 5 includes a main fuel container 30, an oxidant container 31, a compatibilizer container 32, a stirring container 33, a stirrer 34, a mixed fuel injection device 35, a main fuel supply valve 36, an oxidant supply valve 37, a compatibilizer supply valve 38 (a compatibilizer supply unit), a control device 40, a main fuel temperature sensor 41, an oxidant temperature sensor 42, and a mixed fuel temperature sensor 43.

[0031] The main fuel tank 30 contains a main fuel composed of a liquid fuel such as ammonia or alcohol. The main fuel tank 30 is connected to the stirring tank 33 via a main fuel flow path 30a. The main fuel in the main fuel tank 30 is supplied to the stirring tank 33 via the main fuel flow path 30a by a main fuel pump (not shown).

[0032] The combustion-aid container 31 contains a combustion-aid composed of a hydrocarbon liquid fuel such as light oil, kerosene, or heavy oil. The combustion-aid container 31 is connected to the stirring container 33 via an combustion-aid flow path 31a. The combustion-aid container 31 is supplied to the stirring container 33 via the combustion-aid flow path 31a using an combustion-aid pump (not shown).

[0033] The compatibilizer container 32 contains a compatibilizer for promoting mixing of the main fuel and the combustion aid. Examples of the compatibilizer include higher alcohols such as dodecanol, n-butanol, isobutanol, amyl alcohol, and octanol, or ethers such as dimethyl ether (DME). The compatibilizer container 32 is connected to the stirring container 33 via a compatibilizer flow path 32a. A compatibilizer pump (not shown) is used to supply the compatibilizer from the compatibilizer container 32 to the stirring container 33 via the compatibilizer flow path 32a.

[0034] The stirring vessel 33 is a stirring vessel for stirring and mixing the liquid main fuel and the oxidant to produce a liquid mixed fuel composed of the main fuel and the oxidant. The main fuel and the oxidant are supplied to the stirring vessel 33 from the main fuel container 30 and the oxidant container 31, respectively, and the compatibilizer is supplied from the compatibilizer container 32. A stirrer 34 is provided within the stirring vessel 33 for stirring the liquid main fuel and the oxidant. The stirrer 34 is controlled and operated by a control device 40 to stir the main fuel, the oxidant, and the compatibilizer within the stirring vessel 33.

[0035] The stirring container 33 is connected to the mixed fuel injection device 35 via the mixed fuel flow path 33a, and the mixed fuel in the stirring container 33 is supplied to the mixed fuel injection device 35 via the mixed fuel flow path 33a by a mixed fuel pump 33b such as a feed pump. The mixed fuel pump 33b is arranged upstream of the mixed fuel injection device 35 and downstream of the stirring container 33 in the flow direction of the mixed fuel in the mixed fuel flow path 33a.

[0036] At this time, the mixed fuel generated by stirring / mixing the main fuel, the combustion aid, and the phase solvent is not stored in the stirring container 33 but is supplied to the mixed fuel injection device 35. For example, the main fuel, the combustion aid, and the phase solvent are supplied to the stirring container 33 and stirred / mixed in an amount equivalent to the supply amount of the mixed fuel per unit time by the mixed fuel injection device 35 per unit time, thereby suppressing the storage of the mixed fuel. As a result, the mixed fuel is supplied to the mixed fuel injection device 35 before the temperature of the mixed fuel changes in the stirring container 33.

[0037] Furthermore, the stirring vessel 33 and the mixed fuel pump 33b are configured to maintain the temperature of the mixed fuel from the outlet of the stirring vessel 33 to the inlet of the mixed fuel pump 33b within a specified range (e.g., ±5°C) along the direction of flow of the mixed fuel in the mixed fuel flow path 33a. For example, the stirring vessel 33 is positioned near the mixed fuel pump 33b, and specifically, the portion of the mixed fuel flow path 33a from the stirring vessel 33 to the mixed fuel pump 33b is set to be within a specified length. Additionally or alternatively, the portion of the mixed fuel flow path 33a from the stirring vessel 33 to the mixed fuel pump 33b may be provided with a heat-insulating portion 33c. For example, the heat-insulating portion 33c may be formed of a heat-insulating material or may be configured to utilize heat from exhaust gas or cooling water.

[0038] The mixed fuel injection device 35 supplies the mixed fuel to the combustion chamber 12a of the engine 2. The mixed fuel injection device 35 is controlled by the control device 40 and is configured to be able to adjust the supply amount of the mixed fuel. The mixed fuel injection device 35 is provided, for example, in the cylinder head 15 of the engine 2 and directly injects the mixed fuel into the combustion chamber 12a.

[0039] Alternatively, the mixed fuel injection device 35 may be provided in the intake port 18 communicating with the combustion chamber 12a of the engine 2, and may inject the mixed fuel into the interior of the intake port 18, thereby supplying the mixed fuel to the combustion chamber 12a via the intake port 18. Alternatively, the mixed fuel injection device 35 may be provided in the intake manifold 22 communicating with the intake port 18 of the engine 2, and may inject the mixed fuel into the interior of the intake manifold 22, thereby supplying the mixed fuel to the combustion chamber 12a via the intake manifold 22 and the intake port 18.

[0040] The main fuel supply valve 36 is provided in the main fuel flow path 30a, is controlled by the control device 40, and is configured to be able to adjust the amount of main fuel supplied from the main fuel container 30 to the stirring container 33. The oxidant supply valve 37 is provided in the oxidant flow path 31a, is controlled by the control device 40, and is configured to be able to adjust the amount of oxidant supplied from the oxidant container 31 to the stirring container 33. The phase solvent supply valve 38 (phase solvent supply unit) is provided in the phase solvent flow path 32a, is controlled by the control device 40, and is configured to be able to adjust the amount of phase solvent supplied from the phase solvent container 32 to the stirring container 33.

[0041] The control device 40 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 device 40 can store various programs for controlling the engine 2 and controls the engine 2 by reading and executing the programs.

[0042] The main fuel temperature sensor 41 is a temperature detection unit provided in the main fuel container 30 or the main fuel flow path 30a, and detects the temperature of the main fuel supplied to the stirring container 33. The main fuel temperature sensor 41 transmits the temperature detection result of the main fuel to the control device 40. The oxidant temperature sensor 42 is a temperature detection unit provided in the oxidant container 31 or the oxidant flow path 31a, and detects the temperature of the oxidant supplied to the stirring container 33. The oxidant temperature sensor 42 transmits the temperature detection result of the oxidant to the control device 40. The mixed fuel temperature sensor 43 is a temperature detection unit provided in the stirring container 33 or the mixed fuel flow path 33a, and detects the temperature of the mixed fuel supplied from the stirring container 33. The mixed fuel temperature sensor 43 transmits the temperature detection result of the mixed fuel to the control device 40.

[0043] Next, the supply of the phase dissolving agent to the mixed fuel composed of the main fuel and the combustion aid will be described. When the main fuel and the combustion aid are simply mixed, phase separation may occur due to the characteristics of the molecular structure, and good mixing may not be possible. For example, Figure 2 In the map showing the relationship between the mixing ratio of ethanol as the main fuel and light oil as the combustion aid, and the temperature of the mixed fuel, the mixing region where a good fuel mixture is achieved and the phase separation region where phase separation occurs in the mixed fuel are schematically shown. In this map, the temperature at which a good fuel mixture is achieved, i.e., the critical solution temperature, is plotted against the mixing ratio of the main fuel and the combustion aid. The map shows that separation is easiest when the mixing ratio of the main fuel and the combustion aid is around 50%, and that separation becomes more difficult as the proportion of the main fuel or the combustion aid increases. Furthermore, the map shows that separation becomes easier as the temperature of the mixed fuel decreases, and becomes more difficult as the temperature of the mixed fuel increases. In other words, the upper limit concentration of the main fuel or the combustion aid at which phase separation occurs depends on the temperature of the mixed fuel.

[0044] On the other hand, it is known that the phase separation of the fuel mixture can be reduced, for example, the critical solution temperature can be lowered by adding a phase solvent such as a higher alcohol to the fuel mixture. Figure 3 The graph shows the relationship between the concentration of methanol, the main fuel in the mixed fuel, and the concentration of dodecanol, a compatibilizer added to ensure complete mixing of the mixed fuel, for each temperature of the mixed fuel. This graph shows that as the main fuel concentration (mixing ratio) approaches 50%, the concentration (supply amount) of the compatibilizer needs to be increased, while as the main fuel concentration deviates from 50%, the concentration of the compatibilizer can be reduced. Furthermore, this graph shows that as the temperature of the mixed fuel increases, the concentration of the compatibilizer required for complete mixing of the mixed fuel can be reduced.

[0045] Therefore, the control device 40 functions as a supply amount determination unit 40a that determines the supply amount of the compatibilizing agent based on the mixing ratio of the main fuel or the oxidizing agent and the temperature detection result of the temperature detection unit. For example, the supply amount determination unit 40a determines to increase the supply amount of the compatibilizing agent as the mixing ratio of the main fuel or the oxidizing agent approaches 50%.

[0046] Furthermore, in this embodiment, the supply amount determination unit 40a determines the amount of compatibilizer to be added to the mixed fuel, specifically, the supply amount from the compatibilizer supply valve 38 (compatibility agent supply unit), based on at least one of the temperature detection results of the main fuel by the main fuel temperature sensor 41, the temperature detection results of the oxidizer by the oxidizer temperature sensor 42, and the temperature detection results of the mixed fuel by the mixed fuel temperature sensor 43. In this case, the supply amount determination unit 40a determines to reduce the supply amount of compatibilizer as the temperature of the main fuel, oxidizer, or mixed fuel increases. Furthermore, the supply amount determination unit 40a may calculate or estimate the temperature of the mixed fuel based on the temperatures of the main fuel and oxidizer.

[0047] As described above, according to the present invention, an engine system 1 is applied to an engine 2 that operates on a mixed fuel using a main fuel such as ammonia or alcohol and an oxidant composed of a liquid fuel of a hydrocarbon such as light oil, kerosene or heavy oil. The fuel supply device 5 that supplies the mixed fuel to the engine 2 promotes mixing of the main fuel and the oxidant by adding a phase solvent to generate a mixed fuel.

[0048] Thus, according to the fuel supply device 5 of the present invention, the main fuel and the combustion aid can be mixed at the molecular level by the compatibilizer, and the combustion stability of the mixed fuel can be ensured.

[0049] In addition, the fuel supply device 5 of the present invention includes: a temperature detection unit (a main fuel temperature sensor 41, an oxidant temperature sensor 42, and a mixed fuel temperature sensor 43) that detects at least one of the temperatures of the main fuel, the oxidant, and the mixed fuel; a supply quantity determination unit 40a of the control device 40 that determines the supply quantity of the phase solvent based on the temperature detection result of the temperature detection unit; and a phase solvent supply valve 38 (phase solvent supply unit) that supplies the phase solvent in the quantity determined by the supply quantity determination unit 40a. Thus, when the amount of phase solvent required for mixing the main fuel and the oxidant varies depending on the temperatures of the main fuel, the oxidant, and the mixed fuel, it is possible to supply an appropriate amount of phase solvent for mixing the main fuel and the oxidant with a relatively simple structure. Therefore, there is no need for a special device for maintaining the main fuel and the oxidant at a constant temperature, and a complex and expensive structure can be avoided.

[0050] The fuel supply device 5 of the present invention includes: a main fuel container 30 for storing a main fuel; an oxidant container 31 for storing an oxidant; a stirrer 34 for stirring the main fuel and the oxidant; and a stirring container 33 having the stirrer 34. The main fuel and the oxidant are supplied from the main fuel container 30 and the oxidant container 31, respectively, to the stirring container 33, and a predetermined amount of a oxidant is supplied to the stirring container 33 by a oxidant supply valve 38. Thus, the main fuel and the oxidant can be mixed using the oxidant using a simple structure using the stirrer 34 and the stirring container 33.

[0051] Furthermore, the fuel supply device 5 of the present invention includes a mixed fuel injection device 35 for supplying the mixed fuel to the engine 2. The mixed fuel generated by stirring in the stirring container 33 is not stored in the stirring container 33 but is supplied to the mixed fuel injection device 35. Thus, before the temperature of the mixed fuel changes, the mixed fuel can be supplied to the mixed fuel injection device 35 and combusted in the engine 2. Therefore, the amount of the compatibilizing agent required for mixing does not change due to the temperature change of the mixed fuel, and a good mixed state can be maintained to ensure combustion stability.

[0052] Furthermore, the fuel supply device 5 of the present invention includes a mixed fuel pump 33b, which is positioned upstream of the mixed fuel injection device 35 and downstream of the stirring container 33 in the flow direction of the mixed fuel, and pressure-feeds the mixed fuel to the mixed fuel injection device 35. To maintain the temperature change of the mixed fuel from the stirring container 33 to the mixed fuel pump 33b in the flow direction within a specified range, the stirring container 33 is positioned near the mixed fuel pump 33b, and / or a heat-insulating portion 33c is provided in the mixed fuel flow path 33a from the stirring container 33 to the mixed fuel pump 33b. Thus, the mixed fuel can be supplied to the mixed fuel injection device 35 and combusted in the engine 2 before the temperature change of the mixed fuel occurs. Therefore, the amount of the compatibilizing agent required for mixing does not change due to the temperature change of the mixed fuel, and a good mixed state can be maintained, ensuring combustion stability.

[0053] In the fuel supply device 5 of the present invention, the phase solvent is a higher alcohol such as dodecanol, n-butanol, isobutanol, amyl alcohol, octanol, or an ether such as dimethyl ether (DME). Thus, by using a phase solvent suitable for the main fuel and the combustion aid, mixing can be more reliably performed at the molecular level.

[0054] In addition, in the above embodiment, an example is described in which the main fuel flow path 30a and the oxidant flow path 31a are separately connected to the stirring container 33, but the present invention is not limited to this example. The main fuel flow path 30a and the oxidant flow path 31a can also be connected to the stirring container 33 after merging.

[0055] In addition, in the above embodiment, the fuel supply device 5 is described as an example in which the stirring container 33 is provided as a stirring container for stirring and mixing the main fuel and the combustion-supporting agent to generate a mixed fuel, but the present invention is not limited to this example. In other examples, as a stirring container, Figure 4 As shown, the fuel supply device 5 may include a stationary mixer 45 such as a static mixer, instead of the stirring container 33 and the stirrer 34 .

[0056] In this case, the fuel supply device 5 is configured so that the main fuel flow path 30a and the oxidant flow path 31a merge with the mixed fuel flow path 33a, and the fixed mixer 45 is provided in the mixed fuel flow path 33a at a position further downstream than the confluence point of the main fuel flow path 30a and the oxidant flow path 31a in the flow direction of the mixed fuel. The fixed mixer 45 operates and stirs / mixes the mixed fuel according to the flow of the mixed fuel in the mixed fuel flow path 33a. In addition, the compatibilizer flow path 32a is configured so that it merges with the mixed fuel flow path 33a at a position further downstream than the confluence point of the main fuel flow path 30a and the oxidant flow path 31a in the flow direction of the mixed fuel and further upstream than the fixed mixer 45. Thus, the compatibilizer is added to the mixed fuel of the main fuel and the oxidant, and the mixed fuel of the main fuel, the oxidant, and the compatibilizer is stirred / mixed by the fixed mixer 45.

[0057] 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 the fuel supply device and engine system accompanying such modifications are also included in the technical concept of the present invention.

[0058] [Supplementary Notes on the Invention]

[0059] 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.

[0060] Note 1

[0061] A fuel supply device that supplies a mixed fuel of a main fuel and an oxidant consisting of a hydrocarbon liquid fuel to an engine, characterized in that:

[0062] The mixed fuel is generated by mixing a compatibilizing agent, the main fuel, and the combustion aid.

[0063] Note 2

[0064] The fuel supply device according to Supplementary Note 1 is characterized in that:

[0065] The fuel supply device comprises:

[0066] a temperature detecting unit configured to detect at least one of the temperature of the main fuel, the temperature of the oxidant, and the temperature of the mixed fuel;

[0067] a supply amount determination unit that determines the supply amount of the compatibilizing agent based on the temperature detection result of the temperature detection unit; and

[0068] A compatibilizing agent supplying unit supplies the compatibilizing agent in the supply amount determined by the supply amount determining unit.

[0069] Note 3

[0070] The fuel supply device according to Supplementary Note 2 is characterized in that:

[0071] The fuel supply device comprises:

[0072] a main fuel container for containing the main fuel;

[0073] an oxidant container for containing the oxidant;

[0074] a mixer for mixing the main fuel and the combustion-supporting agent; and

[0075] a stirring container having the stirrer,

[0076] The main fuel and the oxidant are supplied from the main fuel container and the oxidant container, respectively, to the stirring container, and the oxidant supply unit supplies the determined supply amount of the oxidant to the stirring container.

[0077] Note 4

[0078] The fuel supply device according to Supplementary Note 3 is characterized in that:

[0079] The fuel supply device includes a mixed fuel injection device for supplying the mixed fuel to the engine.

[0080] The mixed fuel generated by stirring in the stirring container is not stored in the stirring container but is supplied to the mixed fuel injection device.

[0081] Note 5

[0082] The fuel supply device according to Supplementary Note 4 is characterized in that:

[0083] The fuel supply device includes a mixed fuel pump, which is arranged upstream of the mixed fuel injection device and downstream of the stirring container in the flow direction of the mixed fuel, and pressure-feeds the mixed fuel to the mixed fuel injection device.

[0084] The fuel supply device may dispose the stirring container near the mixed fuel pump in the flow direction, and / or include a heat insulating portion in the flow path from the stirring container to the mixed fuel pump.

[0085] <Note 6>

[0086] The fuel supply device according to any one of Supplementary Notes 1 to 5, characterized in that:

[0087] The main fuel is ammonia or alcohol.

[0088] <Note 7>

[0089] The fuel supply device according to any one of Supplementary Notes 1 to 6, characterized in that:

[0090] The phase solvent is higher alcohol or ether.

[0091] <Note 8>

[0092] An engine system, characterized in that:

[0093] The engine system comprises:

[0094] The fuel supply device according to any one of Supplementary Notes 1 to 7; and

[0095] The engine is operated using the mixed fuel.

Claims

1. A fuel supply device that supplies a mixed fuel of a main fuel and an oxidant composed of a hydrocarbon liquid fuel to an engine, It is characterized in that The mixed fuel is generated by mixing a compatibilizing agent, the main fuel, and the combustion improver.

2. The fuel supply device according to claim 1, characterized in that The fuel supply device comprises: a temperature detection unit configured to detect at least one of the temperature of the main fuel, the temperature of the oxidant, and the temperature of the mixed fuel; a supply amount determination unit that determines the supply amount of the compatibilizing agent based on the temperature detection result of the temperature detection unit; and A compatibilizing agent supplying unit supplies the compatibilizing agent in the supply amount determined by the supply amount determining unit.

3. The fuel supply device according to claim 2, characterized in that: The fuel supply device comprises: a main fuel container for containing the main fuel; an oxidant container for containing the oxidant; a mixer for mixing the main fuel and the combustion-supporting agent; and a stirring container having the stirrer, The main fuel and the oxidant are supplied from the main fuel container and the oxidant container, respectively, to the stirring container, and the oxidant supply unit supplies the determined supply amount of the oxidant to the stirring container.

4. The fuel supply device according to claim 3, characterized in that: The fuel supply device includes a mixed fuel injection device for supplying the mixed fuel to the engine. The mixed fuel generated by stirring in the stirring container is not stored in the stirring container but is supplied to the mixed fuel injection device.

5. The fuel supply device according to claim 4, characterized in that: The fuel supply device includes a mixed fuel pump, which is arranged upstream of the mixed fuel injection device and downstream of the stirring container in the flow direction of the mixed fuel, and pressure-feeds the mixed fuel to the mixed fuel injection device. The fuel supply device may dispose the stirring container near the mixed fuel pump in the flow direction, and / or include a heat insulating portion in the flow path from the stirring container to the mixed fuel pump.

6. The fuel supply device according to claim 1, characterized in that The main fuel is ammonia or alcohol.

7. The fuel supply device according to claim 1, characterized in that: The phase solvent is higher alcohol or ether.

8. An engine system, characterized in that: The engine system comprises: The fuel supply device according to claim 1; and The engine is operated using the mixed fuel.

Images