JP5780205B2 - Fuel vaporizer - Google Patents

Description

  The present invention relates to a fuel carburetor that is used in a fuel supply system that supplies fuel to an energy output means that consumes fuel and outputs energy, vaporizes the fuel, and supplies the vaporized fuel to the energy output means. Is.

  Patent Document 1 discloses a fuel supply system in which liquefied natural gas, which is a high-pressure liquid fuel, is vaporized by a vaporizing means, and the vaporized natural gas is supplied to an internal combustion engine, that is, an energy output means that outputs mechanical energy. Has been. Examples of the energy output means include an internal combustion engine mounted on a vehicle and an internal combustion engine of a stationary generator.

JP 2006-264568 A

  By the way, the present inventors, as a fuel vaporizer used in such a fuel supply system, a fuel flow path through which fuel flows, a heat medium flow path that is arranged adjacent to the fuel flow path and through which a heat medium flows, A partition section for partitioning the fuel flow path and the heat medium flow path, wherein the fuel flow path and the heat medium flow path are alternately stacked, and heat is exchanged between the fuel and the heat medium using the partition sections as heat transfer inclusions. As a result, a heat exchanger configured to heat and vaporize the fuel was prototyped.

  This fuel vaporizer uses a coolant that cools the energy output means as a heat medium, and the vaporization performance during steady operation of the energy output means was good.

  However, in order to put the fuel carburetor into practical use, it is necessary to design the fuel carburetor not only during steady operation but also during cold start when the temperature is lower than during steady operation. That is, at a low temperature start when the environmental temperature (outside air temperature) is below freezing point, the temperature of the coolant becomes low as well as the environmental temperature. Therefore, the temperature difference ΔT between the fuel and the heat medium compared to the steady operation. Is small, and the amount of heat exchange obtained is small.

  For this reason, in order to achieve the target heat exchange amount even at the time of low temperature start, the heat transfer area must be increased as compared with the heat exchanger designed under the conditions of steady operation. At this time, if the heat transfer area is increased by increasing the number of layers of the fuel flow path and the heat medium flow path and lengthening the fuel flow path and the heat medium flow path, the fuel vaporizer becomes larger.

  When the fuel vaporizer becomes large, there arises a problem that an installation space for the fuel vaporizer must be secured. Further, when the fuel vaporizer becomes larger, the amount of members constituting the fuel vaporizer increases, and the heat capacity of the members constituting the fuel vaporizer increases. Therefore, the members constituting the fuel vaporizer rather than heating the fuel The heat rises in the temperature rise. As a result, there arises a problem that the vaporization performance of the fuel vaporizer is deteriorated.

  These problems are not limited to the fuel carburetor in which the fuel flow path and the heat medium flow path are alternately stacked, and the fuel flow path through which the fuel flows and the fuel flow path are disposed adjacent to the fuel flow path. A heating medium flow path, and a partition section that divides the fuel flow path and the heat medium flow path, and heats the fuel by exchanging heat between the fuel and the heat medium using the partition section as a heat transfer inclusion. It is a problem that occurs in what is configured to vaporize.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a fuel carburetor that can suppress an increase in the size of the fuel carburetor even when the fuel carburetor is designed for a low temperature start.

To achieve the above object, the present invention provides a fuel carburetor (13) for supplying vaporized fuel to an energy output means for consuming vaporized fuel and outputting energy.
Fuel flow paths (14a, 15a) through which fuel flows;
A heat medium flow path (14b, 15b) disposed adjacent to the fuel flow path and through which the heat medium flows;
Partition sections (13a, 13b) that partition the fuel flow path and the heat medium flow path,
It is configured to heat and vaporize the fuel by exchanging heat between the fuel and the heat medium with the compartment as a heat transfer inclusion,
A flow that is arranged in at least one of the fuel flow path and the heat medium flow path, expands the heat transfer area of the heat transfer inclusions in contact with the fluid, and substantially divides the flow path into a plurality of flow paths. includes a road dividing means (50, 60, 70),
The fuel vaporizer is configured integrally with a first fuel vaporization section (14) for vaporizing fuel and a second fuel vaporization section (15) for vaporizing fuel flowing out from the first fuel vaporization section,
The first fuel vaporization section includes a first fuel flow path (14a) as a fuel flow path and a first heat medium flow path (14b) as a heat medium flow path, and fuel flowing through the first fuel flow path; It is configured to heat and vaporize the fuel by exchanging heat with the first heat medium flowing through the first heat medium flow path,
The second fuel vaporization section includes a second fuel flow path (15a) as a fuel flow path and a second heat medium flow path (15b) as a heat medium flow path, and the fuel flowing through the second fuel flow path It is configured to heat and vaporize the fuel by exchanging heat with a second heat medium different from the first heat medium flowing through the second heat medium flow path .

  According to this, the heat transfer area per unit volume is expanded by the flow path dividing means.

  In addition, since the inside of at least one of the fuel flow path and the heat medium flow path is substantially divided into a plurality of flow paths, compared with the case where no flow path dividing means is provided, The equivalent diameter of the cross section of the flow path in the flow path can be reduced, thereby making it possible to reduce the temperature boundary layer and improve the heat transfer rate between the fuel and the heat medium.

  Here, the heat exchange amount Q between the fuel and the heat medium is generally expressed as Q = h · A · using the heat transfer rate h, the heat transfer area A, and the temperature difference ΔT between the fuel and the heat medium. Indicated by ΔT. For this reason, according to the present invention, the heat exchange amount Q can be increased as compared with the case where the heat exchange core part of the fuel vaporizer has the same physique and is not provided with the flow path dividing means. That is, the physique of the heat exchange core part of the fuel vaporizer necessary for obtaining the same amount of heat exchange amount Q can be reduced.

  As a result, when designing a fuel carburetor so as to satisfy the target heat exchange amount even at a low temperature start, as compared with simply securing the necessary heat transfer area by lengthening the fuel flow path and the heat medium flow path. The enlargement of the fuel vaporizer can be suppressed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

1 is an overall configuration diagram of a fuel supply system according to a first embodiment. It is a disassembled perspective view of the fuel vaporizer of 1st Embodiment. It is a perspective view of the inner fin of a 1st embodiment. It is explanatory drawing which shows the flow of the fuel in the fuel vaporizer of 1st Embodiment, circulating water, and cooling water. It is a Mollier diagram which shows the state of the fuel in the fuel vaporizer of 1st Embodiment. It is a figure which shows the relationship between the heat output in the fuel vaporizer of 1st Embodiment, and the fuel vaporizer of a comparative example, and a physique. It is a disassembled perspective view of the fuel vaporizer of 2nd Embodiment. It is a perspective view of the wall surface of the inner fin of 3rd Embodiment. It is a perspective view of the inner fin of 4th Embodiment. It is a perspective view of the inner fin of 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other will be described with the same reference numerals.

(First embodiment)
A fuel supply system 1 according to the present embodiment shown in FIG. 1 is applied to a vehicle, has a function of supplying fuel to an engine (internal combustion engine) EG that outputs driving force for vehicle travel, and is described later for a vehicle. The air conditioner 2 has a function of cooling the blown air blown into the vehicle interior.

  First, the fuel supply system 1 includes a high-pressure tank 11 as liquid fuel storage means for storing high-pressure liquid fuel that has been pressurized and liquefied. In this embodiment, the fuel stored in the high-pressure tank 11 is flammable, has a relatively high latent heat of vaporization, and further employs a fuel that liquefies even at room temperature (about 15 ° C. to 25 ° C.) in high pressure. doing.

  That is, the fuel of the present embodiment needs to be combustible in order to burn as fuel in the engine EG. Further, as will be described later, in order to cool the blown air by the vaporization latent heat, it is desirable that the fuel has a relatively high vaporization latent heat. Furthermore, it is desirable that the fuel be easily liquefied even at room temperature so that the production cost can be reduced and the gas can be easily vaporized by reducing the pressure.

  Specifically, in this embodiment, ammonia is used as a fuel that has flammability, has a latent heat of vaporization of 20% or more of the latent heat of vaporization of water, and liquefies at 1.5 MPa or less even at room temperature. Yes. Furthermore, since ammonia is a fuel (hydrogen compound) containing hydrogen, flammable hydrogen gas can be generated by reforming.

  In addition, dimethyl ether, alcohol-containing fuel, or the like may be employed as a fuel having equivalent properties. Further, the fuel contains hydrogen, and the molecule of the fuel contains at least one atom of S (sulfur), O (oxygen), N (nitrogen) and halogen, and You may employ | adopt the thing which a hydrogen bond expresses between molecules.

  A fuel inflow port (fuel inflow port 131) of a fuel carburetor 13 that vaporizes fuel is connected to the fuel outflow port of the high-pressure tank 11 via an on-off valve 12. The on-off valve 12 is an electromagnetic valve that opens and closes the fuel flow path from the fuel outlet of the high-pressure tank 11 to the fuel inlet of the fuel carburetor 13, and the operation thereof is controlled by a control voltage output from a system control device described later. Be controlled.

  Then, the flow rate of the fuel flowing into the fuel carburetor 13 is adjusted by the system control device adjusting the valve opening time of the on-off valve 12. Therefore, the on-off valve 12 constitutes a fuel flow rate adjusting means.

  The fuel vaporizer 13 is a vaporization heat exchanger that heats and vaporizes the fuel flowing out from the high-pressure tank 11 by exchanging heat with the heat medium. Further, the fuel vaporizer 13 includes a first fuel vaporization unit 14 that vaporizes liquid fuel (liquid fuel) that has flowed out of the high-pressure tank 11, and liquid fuel or gas-liquid two that has flowed out of the first fuel vaporization unit 14. A second fuel vaporization unit 15 that vaporizes phase-phase fuel (two-phase fuel) is integrally configured.

  More specifically, the first fuel vaporization unit 14 heats the liquid fuel that has flowed out of the high-pressure tank 11 and the circulating water (first heating medium) that circulates in the heating medium circulation circuit 20 of the vehicle air conditioner 2 described later. It is a heat exchanging part that heats and vaporizes the liquid fuel by exchanging. The second fuel vaporization section 15 exchanges heat between the liquid fuel or two-phase fuel that has flowed out of the first fuel vaporization section 15 and the cooling water (second heat medium) of the engine EG that circulates in the cooling water circulation circuit 40 described later. This is a heat exchange part that heats and vaporizes the liquid fuel or the two-phase fuel.

  A buffer tank 16 is connected to a gaseous fuel outlet (fuel outflow port 135) of the fuel vaporizer 13 to store fuel in a gas phase (gas fuel) vaporized by the fuel vaporizer 13. The flow of the gaseous fuel flowing out from the buffer tank 16 is branched into two flows, and one of the branched gaseous fuels flows into a fuel injection valve (injector) 17 for supplying the gaseous fuel into the combustion chamber of the engine EG. The other branched gaseous fuel flows into a reformer (reformer) 18 that reforms the gaseous fuel to generate hydrogen gas.

  The engine EG is configured by a so-called reciprocating engine, and outputs mechanical energy that is a driving force for traveling the vehicle by burning gaseous fuel supplied from the fuel vaporizer 13 via the buffer tank 16. Energy output means.

  The injector 17 is fixed to the cylinder head of the engine EG and injects gaseous fuel toward the intake port of the engine EG. Thus, an air-fuel mixture in which gaseous fuel and combustion air (intake air) are mixed is supplied into the combustion chamber. More specifically, the injector 17 is configured by an electromagnetic valve that opens and closes a fuel supply passage that supplies fuel into the intake passage. The operation of this solenoid valve is controlled by a control voltage output from the system controller.

  And the system control apparatus can adjust the supply flow volume of the fuel supplied into a combustion chamber by adjusting the valve opening time which opens a solenoid valve. In FIG. 1, for clarity of illustration, only one cylinder of the engine EG is illustrated, but this engine EG is a multi-cylinder type (for example, four cylinders) engine, One is provided for each cylinder.

  The reformer 18 generates hydrogen gas by heating a gaseous fuel to a reformable temperature under a catalyst to cause a reforming reaction. Specifically, in the present embodiment, ammonia, which is a hydrogen-containing fuel, is used as the fuel. Therefore, the fuel is heated to 350 ° C. or higher to perform a reforming reaction under the catalyst to generate hydrogen gas. Is generated.

  Hydrogen gas generated in the reformer 18 is mixed with intake air as auxiliary fuel and supplied to the combustion chamber from the intake port of the engine EG. The gaseous fuel and hydrogen gas burned in the engine EG are exhausted from the exhaust port of the engine EG.

  Next, the vehicle air conditioner 2 will be described. The vehicle air conditioner 2 includes a cooling heat exchanger 21 disposed in the heat medium circulation circuit 20, an evaporator 34 of the vapor compression refrigeration cycle 30, a heater 22, and these cooling heat exchangers 21, evaporation. And a casing 23 for housing the heater 34 and the heater 22.

  The casing 23 is arrange | positioned inside the instrument panel of the foremost part of a vehicle interior, and forms the air path of the ventilation air ventilated toward a vehicle interior. On the most upstream side of the blast air flow of the casing 23, an inside / outside air switching device (not shown) that switches and introduces the cabin air (inside air) and the cabin outside air (outside air) is arranged.

  On the downstream side of the air flow of the inside / outside air switching device, a blower 24 that blows air sucked through the inside / outside air switching device into the vehicle interior is arranged. The blower 24 is an electric blower in which the rotation speed (the amount of blown air) is controlled by a control voltage output from the system control device. A cooling heat exchanger 21 of the heat medium circulation circuit 20 is disposed on the downstream side of the air flow of the blower 24.

  Here, the heat medium circulation circuit 20 will be described. The heat medium circulation circuit 20 is a circuit that circulates circulating water (for example, water, an ethylene glycol aqueous solution) as a first heat medium, and the first heat medium flow path 14b of the first fuel vaporization unit 14 of the fuel vaporizer 13; A cooling heat exchanger 21 and a circulating water pump 21a as a first heat medium circulating means are connected in an annular shape.

  The circulating water pump 21a is an electric pump that pumps circulating water to the first heat medium flow path 14b, and the rotation speed (flow rate) is controlled by a control signal output from the system control device. When the system controller activates the circulating water pump 21a, the circulating water circulates in the order of the circulating water pump 21a → the first heat medium flow path 14b → the cooling heat exchanger 21 → the circulating water pump 21a.

  Thereby, the liquid fuel which distribute | circulates the 1st fuel flow path 14a of the 1st fuel vaporization part 14 is heated and vaporized by the circulating water which distribute | circulates the 1st heat-medium flow path 14b. On the other hand, the circulating water is cooled by the latent heat of vaporization of the fuel flowing through the first fuel flow path 14 a in the first heat medium flow path 14 b and flows into the cooling heat exchanger 21. In the cooling heat exchanger 21, the circulating water cooled by the latent heat of vaporization of the fuel and the blown air blown by the blower 24 exchange heat to cool the blown air.

  Further, the temperature of the blown air blown from the blower 24 becomes the outside air temperature when the inside / outside air switching device is switched so as to introduce outside air into the air passage in the casing 23, so that the vehicle interior air is introduced. When switching, the air temperature in the passenger compartment is reached. Therefore, the temperature (hereinafter referred to as the first temperature) T1 of the circulating water pumped from the circulating water pump 21a to the first heat medium flow path 14b is about the outside air temperature or the vehicle interior air temperature (specifically, 20 ° C. to 20 ° C.). 40 ° C).

  An evaporator 34 is arranged on the downstream side of the air flow of the cooling heat exchanger 21. The evaporator 34 is an endothermic heat exchanger that evaporates the low-pressure refrigerant in the refrigeration cycle 30 and exhibits an endothermic action, and further functions to further cool the blown air cooled by the cooling heat exchanger 21. The refrigeration cycle 30 includes a refrigerant compressor 31 that compresses and discharges the refrigerant, a radiator 32 that dissipates heat by exchanging heat with the outside air by the refrigerant compressor 31, an expansion valve 33 that decompresses and expands the refrigerant flowing out of the radiator 32, and evaporation. The vessel 34 is connected in a ring shape.

  A heater 22 is disposed on the downstream side of the blower air flow of the evaporator 34. The heater 22 is an air heating unit that heats the blown air (cold air) that is blown from the blower 24 and passes through the cooling heat exchanger 21 and the evaporator 34 and is cooled. In this embodiment, an electric heater that generates heat when electric power is supplied is adopted as the heater 22, and the heating capability of the heater 22 is controlled by a control voltage output from the system control device.

  An air outlet that blows the conditioned air heated by the heater 22 into the vehicle interior, which is the air-conditioning target space, is disposed at the most downstream portion of the air flow of the casing 23. Specifically, as this air outlet, there are a face air outlet that blows air-conditioned air toward the upper body of the passenger in the vehicle interior, a foot air outlet that blows air-conditioned air toward the feet of the passenger, and the inner surface of the front window glass of the vehicle A defroster outlet (both not shown) is provided to blow air-conditioned air toward the front.

  Further, on the upstream side of the air flow of the face outlet, the foot outlet, and the defroster outlet, a face door for adjusting the opening area of the face outlet, a foot door for adjusting the opening area of the foot outlet, and the defroster outlet, respectively. A defroster door (none of which is shown) for adjusting the opening area is arranged.

  Next, the cooling water circulation circuit 40 will be described. The cooling water circulation circuit 40 is a circuit that circulates cooling water (for example, water or an ethylene glycol aqueous solution) of the engine EG as the second heat medium, and the second heat medium flow path of the second fuel vaporization unit 15 of the fuel vaporizer 13. 15b, the cooling path 42 of the engine EG formed in the engine EG, and the cooling water pump 43 as the second heat medium circulating means are connected in an annular shape.

  The cooling water pump 43 is an electric pump that pumps the cooling water to the second heat medium flow path 15b, and the number of rotations (flow rate) is controlled by a control signal output from the system control device. When the system controller operates the cooling water pump 43, the cooling water circulates in the order of the cooling water pump 43 → the cooling passage 42 in the engine EG → the second heat medium flow path 15b → the cooling water pump 43. .

  Thereby, the liquid fuel or the two-phase fuel flowing through the second fuel flow path 15a of the second fuel vaporization section 15 is heated and vaporized by the cooling water flowing through the second heat medium flow path 15b. On the other hand, the cooling water is cooled by the latent heat of vaporization of the fuel flowing through the second fuel passage 15a in the second heat medium passage 15b and flows into the cooling passage 42 in the engine EG. In the cooling passage 42, the cooling water absorbs the waste heat of the engine EG, and the engine EG is cooled.

  Further, in the present embodiment, during the steady operation of the engine EG, the system controller controls the temperature of the engine EG to be 80 in order to suppress the overheating of the engine EG and reduce the friction loss due to the increase in the viscosity of the engine EG lubricating oil. The cooling water circulation flow rate of the cooling water pump 43 is adjusted so as to be about 100 ° C. to 100 ° C. Accordingly, the temperature (hereinafter referred to as the second temperature) T2 of the cooling water pumped from the cooling water pump 43 to the second heat medium flow path 15b becomes a high temperature of about 80 ° C to 100 ° C.

  That is, the second temperature T2 of the cooling water pumped from the cooling water pump 43 to the second heat medium flow path 15b is the first temperature T1 of the circulating water pumped from the circulating water pump 21a to the first heat medium flow path 14b. Higher than. If the engine EG has a large amount of waste heat and the second fuel vaporization unit 15 cannot sufficiently cool the cooling water, a radiator that exchanges heat between the outside air and the heat medium is added to the cooling water circulation circuit 40. May be.

  Next, a specific configuration of the fuel vaporizer 13 will be described with reference to FIGS.

  As shown in FIG. 2, the fuel vaporizer 13 sequentially stacks a plurality of plate members 13 a to 13 e that are formed by pressing a substantially rectangular metal plate material, and between the plate members 13 a to 13 e. It is comprised as a laminated plate heat exchanger (what is called a laminated heat exchanger) which makes the clearance gap formed in a flow path through which fuel etc. circulate.

  Specifically, in the fuel vaporizer 13, the first and second heat transfer plates 13a and 13b are used as heat transfer inclusions to exchange heat between the fuel and the circulating water or the fuel and the cooling water. Furthermore, in this embodiment, the first fuel vaporization section 14 and the second fuel exchange section 14 are separated by dividing the heat exchange area in which the fuel and circulating water exchange heat and the heat exchange area in which the fuel and cooling water exchange heat with the partition plate 13c. The fuel vaporization unit 15 is functionally divided.

  In the first fuel vaporization section 14, the first and second heat transfer plates 13a and 13b are sequentially stacked to flow out from the high pressure tank 11 between the first heat transfer plate 13a and the second heat transfer plate 13b. The first fuel flow path 14a for circulating the liquid fuel and the first heat medium flow path 14b for circulating the circulating water pumped from the circulating water pump 21a are alternately formed in the stacking direction. The first and second heat transfer plates 13a and 13b constitute a partition section that partitions the first fuel flow path 14a and the first heat medium flow path 14b.

  Further, inner fins 50 for promoting heat exchange between the fuel and the circulating water are disposed inside the first fuel flow path 14a and the first heat medium flow path 14b. The inner fin 50 expands the heat transfer area of the heat transfer inclusions in contact with the fluid inside each of the flow paths 14a and 14b, and divides the flow paths 14a and 14b into a plurality of flow paths. Means.

  As shown in FIG. 3, the inner fin 50 of the present embodiment is formed by bending a thin plate metal into a wave shape. More specifically, the inner fin 50 of the present embodiment has a wave shape in which a cross-sectional shape perpendicular to the flow direction of fluid such as fuel is bent by alternately positioning the convex portions 51 on one side and the other side, The wall surface 52 which divides the inside of each flow path 14a, 14b into a plurality of flow paths is a straight fin extending linearly in the fluid flow direction. As for this straight fin 50, the convex part 51 of the one side and the other side is in contact with the 1st, 2nd heat exchanger plates 13a and 13b.

  As an example of the dimensions of the inner fin 50, when the distance between the centers of the convex portions adjacent to each other on the same side of the one side and the other side is a fin pitch fp in a cross-sectional shape perpendicular to the fluid flow direction, It is preferable that fp = 2.0 to 6.0 mm. The fin height fh, which is the distance from the convex portion 51 on one side to the convex portion 51 on the other side, is the same as the inner diameter in the stacking direction of the flow paths 14a and 14b.

  In addition, as shown in FIG. 2, a total of four tank forming portions, two each, are stamped and formed in the stacking direction on both ends of the first and second plate members 13a and 13b in the long side direction. . The tank forming portion has a through hole at the center thereof, and forms four tank portions for distributing or collecting fuel and circulating water when the first and second plate members 13a and 13b are stacked. . Of these tank parts, two predetermined tank parts communicate with the first fuel flow path 14a, and the remaining two tank parts communicate with the first heat medium flow path 14b.

  A first end plate 13 d is disposed on one end side in the stacking direction of the first fuel vaporization unit 14. The first end plate 13d has a fuel inflow port 131 through which liquid fuel flowing out from the high-pressure tank 11 flows into the first fuel vaporization unit 14, and a first heat medium inflow port 132 through which circulating water flows into the first fuel vaporization unit 14. And the 1st heat-medium outflow port 133 which flows out circulating water from the 1st fuel vaporization part 14 is formed.

  Therefore, in the first fuel vaporization section 14, as shown in FIG. 4, the fuel flowing in from the fuel inflow port 131 flows as shown by a thick solid arrow, and the circulating water flowing in from the first heat medium inflow port 132 is shown by a thick broken line. It flows as shown by the arrow and flows out from the first heat medium outflow port 133.

  On the other hand, a partition plate 13c is disposed on the other end side of the first fuel vaporization section 14 in the stacking direction. The partition plate 13 c functions as a heat insulating unit that suppresses heat transfer between the first fuel vaporization unit 14 and the second fuel vaporization unit 15. Specifically, the partition plate 13c is formed by bonding two plate-like members into a hollow shape, and air is sealed in the internal space. Of course, in order to improve the heat insulation performance, the internal space may be vacuumed.

  Furthermore, the partition plate 13c is formed with a through hole 134 penetrating the front and back. The through hole 134 functions as a fuel flow path for allowing the liquid fuel or the two-phase fuel flowing out from the first fuel vaporization unit 14 to flow into the second fuel vaporization unit 15.

  The basic configuration of the second fuel vaporization unit 15 is the same as that of the first fuel vaporization unit 14. Accordingly, in the second fuel vaporization section 15, the first and second plate members 13a and 13b are sequentially stacked, so that the first fuel vaporization section 14 is interposed between the first plate member 13a and the second plate member 13b. Second fuel flow paths 15a for flowing out liquid fuel or two-phase fuel and second heat medium flow paths 15b for circulating cooling water pumped from the cooling water pump 43 are alternately formed in the stacking direction. .

  Further, as in the first fuel vaporization section 14, an inner fin 50 that promotes heat exchange between the fuel and the cooling water is also disposed inside the second fuel channel 15a and the second heat medium channel 15b. .

  A second end plate 13e is disposed on the other end side (opposite side of the partition plate 13c) of the second fuel vaporization section 15 in the stacking direction, and gaseous fuel is supplied to the second end plate 13e. 2 a fuel outflow port 135 for flowing out from the fuel vaporization section 15, a second heat medium inflow port 136 for flowing cooling water into the second fuel vaporization section 15, and a second heat for flowing out cooling water from the second fuel vaporization section 15. A medium outflow port 137 is formed.

  Therefore, in the second fuel vaporization section 15, as shown in FIG. 4, the fuel flowing in from the through hole 134 of the partition plate 13c flows as shown by the thick solid line arrow and flows out from the fuel outflow port 135, so that the second heat medium The cooling water that has flowed in from the inflow port 136 flows as shown by the thick dotted arrow, and flows out from the second heat medium outflow port 137.

  In this embodiment, since ammonia is employed as the fuel, each component (plate members 13a to 13e, inner fin 50) of the fuel vaporizer 13 is a metal (for example, stainless alloy) that is excellent in corrosion resistance. It is formed with. In the present embodiment, as shown in FIGS. 2 and 4, the ratio of the region occupied by the second fuel vaporization unit 15 to the region occupied by the first fuel vaporization unit 14 in the fuel vaporizer 13 is approximately 1/2.

  Next, the electric control unit of this embodiment will be described. The system control device outputs a control signal (or control voltage) to a well-known microcomputer including a CPU that performs control processing and arithmetic processing, a storage circuit such as a ROM and RAM that stores programs and data, and various devices to be controlled. Output circuit, an input circuit to which detection signals of various sensors are input, a power supply circuit, and the like.

  The various control target devices 12, 17, 21a, 24, 43 and the like described above are connected to the output side of the system control device, and the system control device controls the operation of these control target devices. On the input side of the system controller, a sensor group for engine control for detecting physical quantities used to control the operation of the engine EG, and an air conditioner for detecting physical quantities used to control the operation of the vehicle air conditioner 2 are provided. A control sensor group or the like is connected.

  Specifically, the sensor group for engine control includes an accelerator opening sensor that detects the accelerator opening, a rotation speed sensor that detects the rotation speed of the engine EG, a fuel pressure sensor that detects the fuel pressure flowing into the injector 17, A throttle position sensor that detects the valve opening degree of a throttle valve that is arranged in the intake path of the engine EG and adjusts the intake air flow rate, and a cooling water temperature sensor that detects the temperature of the cooling water flowing out from the cooling passage 42 of the engine EG (whichever (Not shown) or the like.

  The air conditioning control sensor group includes an inside air temperature sensor that detects the temperature inside the vehicle interior, an outside air temperature sensor that detects the outside air temperature inside the vehicle, a solar radiation sensor that detects the amount of solar radiation inside the vehicle interior, and a blowout from the heat exchanger 21 for cooling. A cold air temperature sensor for detecting the temperature of the blown air (cold air), an evaporator temperature sensor for detecting a temperature correlated with the refrigerant evaporation temperature in the evaporator 34 (the temperature of the evaporator 34 in this embodiment), and the heater 22 An air-conditioning air temperature sensor (none of which is shown) for detecting the temperature of the air-conditioning air heated in the above is provided.

  Further, operation signals of a switch group for operating the engine such as a start switch for starting or stopping the vehicle and an ignition switch for starting the engine EG are input to the input side of the system control device. Operation signals of switch groups for air conditioning operations such as an operation switch, an auto switch for setting or canceling automatic control of the vehicle air conditioner 2, and a vehicle interior temperature setting switch as a target temperature setting means for setting a target temperature in the vehicle interior Entered.

  Next, a basic operation of the fuel supply system 1 of the present embodiment having the above-described configuration will be described. First, when the ignition switch is turned on and the engine EG is started, the system control device executes the engine control program stored in the storage circuit. In this engine control program, the supply flow rate of the fuel supplied from the injector 17 to the engine EG is determined according to the operating state of the engine, and the operation of the injector 17 and the like is controlled.

  First, when the engine control program is executed, the system control device reads various detection values of the sensor group for engine control every predetermined control cycle, and based on the read various detection values, the cooling water pump 43 The cooling water pumping capacity, the valve opening time of the injector 17, the valve opening time of the on-off valve 12, etc. are determined.

  Specifically, the cooling water pumping ability of the cooling water pump 43 is determined so that the detected temperature of the cooling water temperature sensor is 80 ° C. or higher and 100 ° C. or lower. Further, the valve opening time of the injector 17 is requested from the engine EG by referring to a control map stored in advance in the storage circuit based on the engine speed, the accelerator opening signal, the valve opening of the throttle valve, and the like. The target fuel supply flow rate required to generate the drive torque that is being determined is determined.

  Then, based on the target fuel supply flow rate, the engine speed, the fuel pressure at the inlet side of the injector 17 and the like, a supply flow rate supplied from the injector 17 to the combustion chamber with reference to a control map stored in advance in the storage circuit However, the valve opening time of the injector 17 which becomes the target fuel supply flow rate is determined.

  Here, the fuel vaporized by the fuel carburetor 13 (specifically, the first fuel vaporization unit 14 and the second fuel vaporization unit 15) is supplied to the engine EG of the present embodiment. Further, the fuel vaporized by the fuel vaporizer 13 is supplied not only to the engine EG but also to the reformer 18. For this reason, the flow rate (mass flow rate) of the fuel vaporized by the fuel carburetor 13 needs to be larger than the supply flow rate (mass flow rate) of the fuel supplied from the injector 17 to the combustion chamber.

  Therefore, in the system control device, the control map stored in advance in the storage circuit is referred to based on the target fuel supply flow rate, the pressure of the fuel flowing out from the high-pressure tank 11 and the like, similarly to the valve opening time of the injector 17 described above. Then, the valve opening time of the on-off valve 12 is determined so that the fuel flow rate supplied to the fuel carburetor 13 is larger than the target fuel supply flow rate by a predetermined amount.

  Then, the system control device outputs a control signal to the cooling water pump 43, the injector 17 and the on-off valve 12 from the output circuit or the drive circuit (EDU) so as to be in the control state determined as described above.

  After that, until the stop of the vehicle is requested by the start switch, the above detection signal and operation signal are read at every predetermined control cycle → the cooling water pumping ability of the cooling water pump 43, and the injector 17 and the on-off valve 12 are opened. Control routine such as determination of time and the like → output of a control signal indicating the determined cooling water pumping capacity and valve opening time is repeated.

  At this time, in the fuel vaporizer 13, the liquid fuel that has flowed into the second fuel flow path 15a via the first fuel flow path 14a of the first fuel vaporization section 14 flows through the second heat medium flow path 15b. It is heated and vaporized. On the other hand, the cooling water flowing through the second heat medium flow path 15b is cooled by the latent heat of vaporization of the fuel flowing through the first fuel flow path 14a.

  As described above, the valve opening time of the on-off valve 12 is determined so that the flow rate of the fuel flowing into the fuel carburetor 13 is larger than the target fuel supply flow rate, and during the steady operation of the engine EG, the cooling is performed. Since the second temperature T2 of water becomes a high temperature of 80 ° C. to 100 ° C., the fuel vaporizer 13 can vaporize a fuel having a flow rate sufficient to generate the required driving torque.

  Furthermore, the system control apparatus of the present embodiment energizes an electric heater (not shown) as a reforming heating means provided in the reformer 18 with the start of the engine EG, so that the temperature is higher than the reformable temperature. Heat the fuel until Thereby, hydrogen gas can be supplied to the combustion chamber of the engine EG as auxiliary fuel.

  Next, when the auto switch is turned on while the operation switch of the vehicle air conditioner 2 is turned on during startup of the engine EG, the system control device executes the air conditioning control program stored in the storage circuit. To do. In this air conditioning control program, the control state of the control target device for air conditioning connected to the output side of the system control device is determined according to the air conditioning load, and the control target device is operated so as to be in the determined control state. To control.

  Specifically, when the air conditioning control program is executed, the system control device operates the circulating water pump 21a so as to achieve a predetermined reference rotation speed (reference heat medium pumping ability). Further, the system control device determines a target blowing temperature TAO of the blown air blown out from each outlet into the passenger compartment based on the passenger compartment temperature, the passenger compartment outside temperature, the amount of solar radiation, and the like.

  And based on this target blowing temperature TAO and the detection signal of the sensor group for air-conditioning control, the action | operation of a control object apparatus is controlled. For example, for the target air flow rate of the blower 24, that is, the control voltage output to the electric motor of the blower 24, the target blowout temperature TAO is determined by referring to the control map stored in advance in the storage circuit based on the target blowout temperature TAO. It is determined to be higher at the high temperature and at the low temperature than at the intermediate temperature.

  Further, the refrigerant discharge capacity of the refrigerant compressor 31 of the refrigeration cycle 30 increases with an increase in the target outlet temperature TAO with reference to a control map stored in advance in the storage circuit based on the target outlet temperature TAO. Thus, the target refrigerant evaporation temperature TEO in the evaporator 34 is determined, and the feedback control method is used to determine that the deviation between the target refrigerant evaporation temperature TEO and the detected value detected by the evaporator temperature sensor is reduced.

  The control voltage output to the heater 22 is based on the deviation between the temperature of the conditioned air heated by the heater 22 and the target temperature set by the vehicle interior temperature setting switch using a feedback control method. Is determined so that the temperature of the conditioned air blown out from the air approaches the target cold air temperature TEO.

  Then, the system control device outputs the control signal determined as described above from the output circuit or the drive circuit to the control target device. Thereafter, until the stop of the operation of the vehicle air conditioner 2 is requested, reading of the detection signal and the operation signal described above → determination of the control state of the device to be controlled → obtained control state is obtained for each predetermined control cycle. A control routine such as outputting a control signal is repeated.

  At this time, the fuel carburetor 13 has a flow rate sufficient to cause the engine EG to output the required output at the first fuel vaporization unit 14 and the second fuel vaporization unit 15 as shown in the Mollier diagram of FIG. The fuel can be vaporized. That is, the liquid fuel flowing out from the high-pressure tank 11 (point a in FIG. 5) is reduced in pressure by the pressure loss when passing through the on-off valve 12 (point a → b in FIG. 5). It flows into the first fuel flow path 14a.

  The liquid fuel that has flowed into the first fuel flow path 14a exchanges heat with the circulating water that has flowed into the first heat medium flow path 14b at the first temperature T1 (20 ° C. to 40 ° C. during steady operation except during cold start). Then, the enthalpy is raised (point b → point c in FIG. 5). As a result, the circulating water is cooled and a part of the liquid fuel flowing into the first fuel flow path 14a is vaporized to become a two-phase fuel to the second fuel flow path 15a of the second fuel vaporization section 15. Inflow.

  The two-phase fuel that has flowed into the second fuel flow path 15a is supplied with cooling water and heat at the second temperature T2 (80 ° C. to 100 ° C. during steady operation excluding low temperature startup) that has flowed into the second heat medium flow path 15b. Exchange to further increase the enthalpy (point c → point d in FIG. 5). Thereby, the cooling water is cooled, and the two-phase fuel that has flowed into the second fuel flow path 15a is further vaporized to become gaseous fuel and flow out of the fuel vaporizer 13.

  That is, in the fuel carburetor 13, the second temperature T2 of the cooling water is higher than the first temperature T1 of the circulating water during the steady operation except during the low temperature start. The average enthalpy H2 of the fuel becomes higher than the average enthalpy H1 of the fuel in the first fuel vaporization unit 14. In other words, the enthalpy of fuel at a predetermined portion of the second fuel vaporization unit 15 is higher than the enthalpy of fuel at a corresponding portion of the first fuel vaporization unit 14.

  That is, the enthalpy of fuel in the fuel inflow portion of the second fuel vaporization unit 15 is higher than the enthalpy of fuel in the fuel inflow portion of the first fuel vaporization unit 14, and in the fuel outflow portion of the second fuel vaporization unit 15. The enthalpy of fuel is higher than the enthalpy of fuel in the fuel outflow part of the first fuel vaporization part 14.

  Even when the vehicle air conditioner 2 is in operation, the opening / closing time of the on-off valve 12 is determined so that the flow rate of the fuel flowing into the fuel carburetor 13 is larger than the target fuel supply flow rate. Therefore, the fuel vaporizer 13 can vaporize the fuel at a flow rate sufficient to generate the required driving torque.

  Further, in the vehicle air conditioner 2, the air blown from the blower 24 is cooled by the cooling heat exchanger 21 and the evaporator 34, and the cold air cooled by the cooling heat exchanger 21 is heated by the heater 22. The temperature is adjusted to a desired temperature for the occupant and is blown out into the vehicle compartment via each outlet. And, by the conditioned air blown into the vehicle interior, cooling of the vehicle interior is realized when the vehicle interior temperature is cooled below the vehicle exterior temperature, and when the vehicle interior temperature is heated higher than the vehicle interior temperature, Heating of the passenger compartment is realized.

  Next, main effects of the fuel vaporizer 13 of this embodiment will be described.

  As described above, in the fuel vaporizer 13 of the present embodiment, the inner fins 50 are arranged in both the first fuel flow path 14a and the first heat medium flow path 14b in the first fuel vaporization section 14. Similarly, the inner fins 50 are disposed in both the second fuel flow path 15a and the second heat medium flow path 15b in the second fuel vaporization section 15.

  For this reason, in this embodiment, compared with the case where the inner fin 50 is not arrange | positioned by each inner flow path 14a, 14b, 15a, 15b by the inner fin 50, it is the heat transfer area A per unit volume in a flow path. Has been expanded.

  Further, according to the present embodiment, the inner fin 50 divides the interior of each flow path 14a, 14b, 15a, 15b into a plurality of flow paths, so that compared to the case where the inner fin 50 is not provided. The equivalent diameter of the cross section of the flow path in one flow path can be reduced, thereby making it possible to reduce the temperature boundary layer and improve the heat transfer rate h between the fuel and the heat medium.

Here, the heat transfer rate h is generally expressed by the following equation.
h = (Nu · λ) / d Formula (1)
Nu: Nusselt number, d: equivalent diameter, λ: thermal conductivity Nusselt number Nu is expressed by the following equation.
Nu = Re ^a · Pr ^b · C Formula (2)
Re: Reynolds number, Pr: Prandtl number, C: constant Further, the Reynolds number Re is represented by the following equation.
Re = (ρ · u · d) / μ Equation (3)
ρ: Density, u: Heat flux, d: Equivalent diameter From equation (1), it can be seen that when the equivalent diameter d decreases, the heat passage rate h increases. The equivalent diameter d is also included in the equation (3). However, since d in the equation (3) is a power as shown in the equation (2), d in the equation (3) decreases. The influence on the heat passage rate h due to is smaller than the influence caused by a decrease in d in the equation (1).

Further, the heat exchange amount Q between the fuel and the heat medium is generally expressed by the following equation using the heat passage rate h, the heat transfer area A, and the temperature difference ΔT between the fuel and the heat medium.
Q = h · A · ΔT (4)
For this reason, according to the present embodiment, the first and second fuel vaporization sections 14 and 15 have the same physique of the heat exchange core section and have no first and second inner fins. 2 The heat exchange amount Q in the fuel vaporization units 14 and 15 can be increased. That is, the physique of the heat exchange core part necessary for obtaining the same amount of heat exchange amount Q can be reduced.

  Specifically, as shown in FIG. 6, according to the fuel carburetor 13 of the present embodiment including the inner fins 50, when the fin pitch fp is 2.0 mm, 4.0 mm, and 6.0 mm, the inner fins are Compared with the fuel vaporizer of the comparative example which does not have, the physique required in order to obtain the same heat output (target value) can be made into about 1/2.

  Therefore, according to the present embodiment, when the fuel carburetor is designed so as to satisfy the target heat exchange amount even at a low temperature start, the number of stacks of the first fuel flow path 14a and the first heat medium flow path 14b and Compared to the case where the required number of heat transfer areas is ensured by increasing the number of layers of the second fuel flow path 15a and the second heat medium flow path 15b, the fuel vaporizer 13 can be prevented from being enlarged.

(Second Embodiment)
As shown in FIG. 7, the fuel carburetor 13 of the present embodiment is modified so that only the cooling water of the engine EG is used as a heat medium for heat exchange with the fuel with respect to the fuel carburetor of the first embodiment. It is.

  Specifically, the fuel vaporizer 13 sequentially stacks the first and second heat transfer plates 13a and 13b, so that the high-pressure tank 11 is interposed between the first heat transfer plate 13a and the second heat transfer plate 13b. The fuel flow path 15a for flowing the liquid fuel that has flowed out from the air and the heat medium flow path 15b for flowing the cooling water pumped from the cooling water pump 43 are alternately formed in the stacking direction.

  And the inner fin 50 similar to 1st Embodiment is arrange | positioned inside the flow path of both the fuel flow path 15a and the heat-medium flow path 15b. For this reason, there are the same effects as the first embodiment also in the present embodiment.

(Third embodiment)
The fuel vaporizer 13 of the present embodiment uses an inner fin in which at least one louver 53 is formed on the wall surface 52 of the straight fin 50 of the first and second embodiments, as shown in FIG. .

  The louver 53 has a shape obtained by cutting and raising a part of the wall surface 52. Through the formation of the louver 53, a through hole 54 is formed in the wall surface 52. In this embodiment, since the fluid such as fuel passes through the through hole 54 formed in the wall surface 52 with the louver 53 serving as a flow resistance, the through hole 54 also substantially constitutes a flow path.

  Therefore, according to the present embodiment, the equivalent diameter of the cross section of the flow path can be further reduced as compared with the case where the louver 53 is not formed on the wall surface 52 of the straight fin 50.

(Fourth embodiment)
The fuel vaporizer 13 of this embodiment uses an offset fin 60 shown in FIG. 9 as an inner fin. Other configurations are the same as those in the first and second embodiments.

  The offset fin 60 has a wave shape in which a cross-sectional shape perpendicular to the fluid flow direction is bent by alternately positioning the convex portions 61 on one side and the other side, and the inside of each flow path is formed into a plurality of flow paths. The wall surfaces 62 to be divided are arranged in a staggered manner along the fluid flow direction.

  The offset fin 60 includes a cut-and-raised portion 63 that is partially cut and raised. When viewed from the fluid flow direction, the corrugated portion formed by the cut and raised portion 63 is formed in the fluid flow direction. It is offset with respect to the adjacent corrugated part.

  The use of the offset fin 60 also provides the same effect as that of the first embodiment.

(Fifth embodiment)
The fuel vaporizer 13 of this embodiment uses pin fins 70 shown in FIG. 10 as inner fins. Other configurations are the same as those in the first and second embodiments.

  The pin fin 70 includes a plurality of columnar pins 72 provided on the flat portion 71. The plurality of pins 72 are arranged in a plurality of rows. Note that the plurality of pins 72 may be arranged in a staggered manner.

  Using the pin fin 70 also has the same effect as that of the first embodiment. According to the present embodiment, a vortex is formed on the downstream side of the fluid flow of the pin 72, whereby heat exchange with a fluid such as fuel is promoted, so that the heat passing rate h is increased.

(Other embodiments)
(1) In each of the embodiments described above, the fuel vaporizer has a configuration in which the fuel flow paths and the heat medium flow paths are alternately stacked. However, the fuel vaporizer does not necessarily have to have a configuration in which the fuel vaporizers are alternately stacked. The fuel vaporizer according to the present invention includes a fuel flow path through which fuel flows, a heat medium flow path through which the heat medium flows, and a partition section that partitions the fuel flow path and the heat medium flow path. It is sufficient if the configuration includes the above.

  For example, the fuel vaporizer may be constituted by a heat exchanger having a double pipe structure in which an inner pipe is disposed inside an outer pipe. In this case, the space between the outer tube and the inner tube constitutes the heat medium flow path, the inner space of the inner tube constitutes the fuel flow path, and the inner pipe defines the fuel flow path and the heat medium flow path. Parts.

  (2) In each of the above-described embodiments, the inner fin is disposed in both the fuel channel and the heat medium channel, but the inner fin is disposed in one of the fuel channel and the heat medium channel. The effect of the present invention is also achieved.

  (3) In each of the above-described embodiments, the inner fins 50, 60, and 70 are used. However, even if the inner fins are not generally called inner fins, the heat transfer area of the heat transfer inclusion in contact with the fluid is used. In addition, the flow path dividing means that substantially divides the flow path into a plurality of flow paths can be used instead of the inner fins.

  For example, a metal wire made of stainless alloy rolled to have a large number of gaps, or a porous body having a large number of gaps made of foam metal may be used. Even when these are arranged inside the fluid, the heat transfer area is enlarged, and the gap constitutes a fluid flow path. Therefore, the fuel flow path and the heat medium flow path are substantially divided into a plurality of flow paths. It can be said that the equivalent diameter of the cross section of the flow path is reduced.

  (4) In each of the above-described embodiments, the example in which the engine (internal combustion engine) EG mounted on the vehicle is employed as the energy output means has been described. However, an internal combustion engine used in a stationary generator may be employed. . Further, as the energy output means, for example, a fuel cell that consumes fuel by causing an electrochemical reaction between a fuel gas (hydrogen gas) generated by the reformer 18 and an oxidant gas (air) and outputs electric energy. May be adopted. Further, a combustion furnace that burns fuel and outputs thermal energy may be employed as the energy output means.

DESCRIPTION OF SYMBOLS 1 Fuel supply system 13 Fuel vaporizer 13a 1st heat-transfer plate (compartment part)
13b Second heat transfer plate (partition)
14 1st fuel vaporization part 14a 1st fuel flow path (fuel flow path)
14b First heat medium flow path (heat medium flow path)
15 2nd fuel vaporization part 15a 2nd fuel flow path (fuel flow path)
15b Second heat medium flow path (heat medium flow path)
50 Straight fin (inner fin, channel dividing means)
53 louver 60 offset fin (inner fin, flow path dividing means)
70 pin fins (inner fins, channel dividing means)

Claims (8)

A fuel carburetor (13) for supplying vaporized fuel to an energy output means for consuming vaporized fuel and outputting energy,
Fuel flow paths (14a, 15a) through which fuel flows;
A heat medium flow path (14b, 15b) that is disposed adjacent to the fuel flow path and through which the heat medium flows;
Partition sections (13a, 13b) that partition the fuel flow path and the heat medium flow path,
It is configured to heat and vaporize the fuel by heat-exchanging the fuel and the heat medium with the partition portion as a heat transfer inclusion,
It is arranged in at least one of the fuel flow path and the heat medium flow path, and expands the heat transfer area of the heat transfer inclusions in contact with the fluid, and the interior of the flow path is substantially divided into a plurality of flow paths. comprises a flow path dividing means (50, 60, 70) for dividing,
The fuel vaporizer is configured integrally with a first fuel vaporization section (14) for vaporizing fuel and a second fuel vaporization section (15) for vaporizing fuel flowing out from the first fuel vaporization section. Yes,
The first fuel vaporization section includes a first fuel channel (14a) as the fuel channel and a first heat medium channel (14b) as the heat medium channel, and the first fuel channel. The fuel flowing through the first heat medium flow path and the first heat medium flowing through the first heat medium flow path are configured to heat and vaporize the fuel,
The second fuel vaporization unit includes a second fuel flow path (15a) as the fuel flow path and a second heat medium flow path (15b) as the heat medium flow path, and the second fuel flow path The fuel is heated and vaporized by exchanging heat between the fuel flowing through the second heat medium different from the first heat medium flowing through the second heat medium flow path. To fuel vaporizer.   The fuel vaporizer according to claim 1, wherein the flow path dividing means is an inner fin (50, 60, 70).   The inner fin has a wave shape in which a cross-sectional shape perpendicular to the fluid flow direction is bent by alternately positioning the convex portions (51) on one side and the other side, and the inside of the flow path includes a plurality of flow paths. The fuel carburetor according to claim 2, wherein the wall surface (52) divided into two is a straight fin (50) extending linearly in the fluid flow direction.   The fuel carburetor according to claim 3, wherein at least one louver (53) is formed on the wall surface of the straight fin.   In the cross-sectional shape, the fin pitch is 2 to 6 mm when the distance between the centers of adjacent convex portions on one side and the other side is defined as a fin pitch (fp). The fuel vaporizer according to claim 3 or 4.   The inner fin has a wave shape in which a cross-sectional shape perpendicular to a fluid flow direction is bent by alternately positioning convex portions (61) on one side and the other side, and a plurality of flow paths are formed inside the flow path. The fuel carburetor according to claim 2, wherein the wall surface (62) divided into two is offset fins (60) arranged in a staggered manner along the fluid flow direction.   The fuel carburetor according to claim 2, wherein the inner fin is a pin fin (70) having a plurality of columnar pins.   The fuel vaporizer according to any one of claims 1 to 7, wherein the fuel flow path and the heat medium flow path are alternately stacked.

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