WO2010046978A1

WO2010046978A1 - Working medium circulating type engine

Info

Publication number: WO2010046978A1
Application number: PCT/JP2008/069153
Authority: WO
Inventors: 享加藤; 澤田　大作; 黒木　錬太郎
Original assignee: トヨタ自動車株式会社
Priority date: 2008-10-22
Filing date: 2008-10-22
Publication date: 2010-04-29

Abstract

A working medium circulating type engine (1) comprising a combustion chamber (CC) capable of expanding working medium as combustion of fuel progresses and exhausting to an exhaust pipe (18) vapor and working medium as exhaust gas after combustion of fuel, a circulating path (20) capable of circulating working medium contained in exhaust gas from the exhaust side of the combustion chamber (CC) to the supply side to supply it to the combustion chamber (CC) again, a condensing means (60) provided on the circulating path (20) and condensing vapor contained in exhaust gas into condensate water, a storing means (80) capable of storing condensate water, and a transferring means (90) for transferring exhaust heat in exhaust gas from the exhaust pipe (18) to condensate water stored in the storing means (80) to evaporate the condensate water, whereby it is possible to enhance mounting performance.

Description

Working gas circulation engine

The present invention relates to a working gas circulation engine, and more particularly to a working gas circulation engine in which working gas contained in exhaust gas is circulated from the exhaust side to the intake side of the combustion chamber and can be supplied to the combustion chamber again.

As a conventional engine, a working gas circulation engine that is a so-called closed-cycle engine that can circulate the working gas contained in the exhaust gas from the exhaust side of the combustion chamber to the intake side and supply it again to the combustion chamber is known. . Such a working gas circulation engine includes oxygen as an oxidant, hydrogen as a fuel whose combustion is accelerated by the oxygen, a combustion chamber to which a working gas composed of a monoatomic gas is supplied, and a working gas. A circulation path that can be circulated from the exhaust side to the intake side of the combustion chamber and re-supplied to the combustion chamber, and the working gas thermally expands with the combustion of hydrogen in the combustion chamber to generate power, and this operation The gas is supplied again to the combustion chamber via the circulation path without being released to the atmosphere.

As a conventional working gas circulation engine, for example, a hydrogen engine disclosed in Patent Document 1 below is known. In the hydrogen engine described in Patent Document 1, oxygen and hydrogen are supplied to a combustion chamber, and argon is circulated as a working gas to increase thermal efficiency, for example, composed of a monoatomic gas and having a higher specific heat ratio than air. Has been. In this working gas circulation engine, argon is thermally expanded by combustion of hydrogen in a combustion chamber, and thereby a piston is pushed down to generate power.

By the way, water vapor is generated by combining hydrogen and oxygen with hydrogen combustion in the combustion chamber, so that water vapor is discharged together with argon as exhaust gas from the combustion chamber in the circulation path. For this reason, the hydrogen engine described in Patent Document 1 as a conventional working gas circulation engine is a molecule composed of three atoms (triatomic molecule), which liquefies and condenses water vapor having a smaller specific heat ratio than argon. A condenser to be removed as water is arranged on the circulation path so that only argon as a working gas is circulated and supplied to the combustion chamber again, thereby suppressing a decrease in thermal efficiency.

Here, in the hydrogen engine described in Patent Document 1, for example, it is necessary to appropriately treat the condensed water condensed from the exhaust gas by the condenser. On the other hand, the hydrogen engine described in Patent Document 1 has an exhaust gas pipe that passes through an exhaust gas pipe through which exhaust gas flows, such as an oil-water separator of condensed water described in Patent Document 2, for example. The condensate is stored in a storage tank provided so as to cover the heat, and the condensed water stored in the storage tank and the outer surface of the exhaust gas pipe are brought into contact with each other to exchange heat. By treating after evaporation, the condensed water can be treated appropriately.

JP-A-11-93681 JP 2008-161785 A

However, in the combination of the hydrogen engine described in Patent Document 1 as described above and the oil / water separator of condensed water described in Patent Document 2, the condensate can be treated appropriately. For example, there was room for further improvement in terms of mountability. That is, when the condensed water stored in the storage tank as described above is brought into contact with the outer surface of the exhaust gas pipe and the condensed water is evaporated using exhaust heat, the hydrogen engine is stored in the storage tank. In order to bring the condensed water stored in the tank into contact with the outer surface of the exhaust gas pipe, the storage tank must be arranged in a limited mounting space near the exhaust gas pipe. For this reason, this hydrogen engine has less flexibility in mounting the storage tank. For example, the engine can be increased in size to ensure sufficient storage tank capacity, or conversely, sufficient storage tank capacity can be ensured. There was a risk of not being able to.

Therefore, an object of the present invention is to provide a working gas circulation engine that can improve the mountability.

In order to achieve the above object, a working gas circulation engine according to the first aspect of the present invention includes an oxidant, a fuel whose combustion is promoted by the oxidant and which generates steam by the combustion, and a working gas. A combustion chamber capable of expanding the working gas with combustion of the fuel and capable of exhausting the water vapor and the working gas to the exhaust pipe as exhaust gas after combustion of the fuel; and in the exhaust gas The working gas contained in the combustion chamber is circulated from the exhaust side to the intake side of the combustion chamber and can be supplied again to the combustion chamber, and the water vapor contained in the exhaust gas provided in the circulation path is condensed. Condensing means for condensate, storage means for storing the condensed water, exhaust heat of the exhaust gas is transmitted from the exhaust pipe to the condensed water stored in the storage means, and the condensed water is evaporated. Characterized in that it comprises a that transmission means.

In the working gas circulation engine according to the second aspect of the present invention, the transmission means is formed separately from the exhaust pipe, and the contact portion with the condensed water is made of a material having corrosion resistance against weak acidity. It is formed.

In the working gas circulation engine according to the third aspect of the present invention, the transmission means supplies the condensed water from the exhaust pipe upstream of the condensing means to the condensed water with respect to the circulation direction of the working gas circulating in the circulation path. It is characterized by transmitting exhaust heat.

In the working gas circulation engine according to the invention according to claim 4, a heat exchange medium circulation path for circulating the heat exchange medium in the condensing means, and a cooling means capable of cooling the heat exchange medium circulating in the heat exchange medium circulation path The condensing means is included in the exhaust gas by exchanging heat between the heat exchange medium circulated through the heat exchange medium circulation path and cooled by the cooling means and the exhaust gas flowing through the circulation path. The water vapor is condensed into the condensed water and separated from the exhaust gas, and the heat exchange medium circulation path stores the heat exchange medium after heat exchange with the exhaust gas and before cooling by the cooling means. The condensed water stored in the means is circulated so as to be able to exchange heat.

According to the working gas circulation engine according to the present invention, since the exhaust heat of the exhaust gas is transmitted from the exhaust pipe to the condensed water stored in the storing means and the condensed water is evaporated, the proper condensed water is provided. Mountability can be improved after processing.

FIG. 1 is a schematic configuration diagram of a working gas circulation engine according to Embodiment 1 of the present invention. FIG. 2 is a schematic configuration diagram of a working gas circulation engine according to the second embodiment of the present invention. FIG. 3 is a schematic configuration diagram of a working gas circulation engine according to Embodiment 3 of the present invention. FIG. 4 is a schematic configuration diagram of a working gas circulation engine according to the first modification of the present invention. FIG. 5 is a schematic configuration diagram of a working gas circulation engine according to the second modification of the present invention.

Explanation of symbols

1, 1A, 1B, 201, 301 Working gas circulation engine 10 Engine body

11b Intake port

11c Exhaust port 17 Intake pipe 18 Exhaust pipe 20 Circulation path 30 Oxidant supply device 40 Fuel supply device 50 Electronic control device 60 Condenser means)
61,361 Cooling water circulation path (heat exchange medium circulation path)
63 Radiator (cooling means)
80 Condensate storage tank (storage means)
90 Exhaust heat transfer section (transfer means)
90A heat pipe (transmission means)
90B Heat transfer circuit (transmission means)
91 Exhaust pipe side heat receiving part 92 Tank side heat radiating part 93 Transmission part 361a Circulation path heat radiating part CC Combustion chamber

Hereinafter, an embodiment of a working gas circulation engine according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a working gas circulation engine according to Embodiment 1 of the present invention.

As shown in FIG. 1, the working gas circulation engine 1 of the present embodiment is a combustion that is supplied with an oxidant, a fuel that is promoted by the oxidant, and a working gas that generates power as the fuel burns. The chamber CC and a circulation path 20 connecting the intake side and the exhaust side of the combustion chamber CC are provided, and the working gas is supplied again to the combustion chamber CC via the circulation path 20 without being released to the atmosphere. This is a so-called closed cycle engine. This working gas circulation engine 1 improves thermal efficiency by burning fuel in a combustion chamber CC and generating power by thermally expanding the working gas as the fuel burns.

The working gas circulation engine 1 includes an engine body 10 in which a combustion chamber CC is formed, a circulation path 20 that connects the intake side and the exhaust side of the combustion chamber CC, and an oxidant that supplies an oxidant to the combustion chamber CC. A supply device 30, a fuel supply device 40 that supplies fuel to the combustion chamber CC, and an electronic control unit (ECU) 50 that controls each part of the working gas circulation engine 1 are provided. The combustion chamber CC and the circulation path 20 of the engine body 10 are both filled with working gas, and the working gas circulates between the combustion chamber CC and the circulation path 20. 1 shows only one cylinder, the working gas circulation engine 1 of the present invention is not limited to this, and a multi-cylinder engine body 10 can also be applied.

The combustion chamber CC of the present embodiment is formed in the engine body 10. The combustion chamber CC of the engine body 10 is supplied with an oxidizer, fuel that promotes combustion by the oxidizer and generates water vapor by combustion, and working gas, and the working gas expands as the fuel burns. In addition, it is possible to exhaust water vapor and working gas to the exhaust pipe 18 as exhaust gas after combustion of fuel.

Specifically, the engine body 10 includes a cylinder head 11, a cylinder block 12, and a piston 13 that form a combustion chamber CC. The piston 13 is connected to a crankshaft (not shown) via a connecting rod 14 and is disposed so as to be able to reciprocate in the space between the recess 11 a on the lower surface of the cylinder head 11 and the cylinder bore 12 a of the cylinder block 12. The combustion chamber CC is configured by a space surrounded by the wall surface of the recess 11 a of the cylinder head 11, the wall surface of the cylinder bore 12 a, and the top surface 13 a of the piston 13.

The engine body 10 has a cylinder head 11 formed with an intake port 11b and an exhaust port 11c. Both the intake port 11b and the exhaust port 11c form part of the circulation path 20. One end of each of the intake port 11b and the exhaust port 11c opens into the combustion chamber CC. The engine main body 10 is provided with an intake valve 15 at an opening portion of the intake port 11b on the combustion chamber CC side. The intake valve 15 opens the opening on the combustion chamber CC side of the intake port 11b when the valve is opened, and closes the opening on the combustion chamber CC side of the intake port 11b when the valve is closed. The engine body 10 is provided with an exhaust valve 16 at an opening portion of the exhaust port 11c on the combustion chamber CC side. The exhaust valve 16 opens the opening on the combustion chamber CC side of the exhaust port 11c when the valve is opened, and closes the opening on the combustion chamber CC side of the exhaust port 11c when the valve is closed.

As the intake valve 15 and the exhaust valve 16, for example, there are those that are opened and closed in accordance with the rotation of a camshaft (not shown) and the elastic force of an elastic member (string spring). In this type of intake valve 15 and exhaust valve 16, a camshaft is interlocked with the rotation of the crankshaft by interposing a power transmission mechanism composed of a chain, a sprocket, etc. between the camshaft and the crankshaft. Open / close drive at the opened / closed timing. The engine body 10 may include a variable valve mechanism such as a so-called variable valve timing & lift mechanism that can change the opening / closing timing and lift amount of the intake valve 15 and the exhaust valve 16, thereby The opening / closing timing and lift amount of the valve 15 and the exhaust valve 16 can be changed to suitable ones according to the operating conditions. Furthermore, the engine body 10 is applied with a so-called electromagnetically driven valve that opens and closes the intake valve 15 and the exhaust valve 16 using electromagnetic force in order to obtain the same effect as the variable valve mechanism. Also good.

The engine body 10 has an intake pipe 17 connected to an opening of the intake port 11b opposite to the combustion chamber CC side, and an exhaust pipe 18 connected to an opening of the exhaust port 11c opposite to the combustion chamber CC side. It is connected. The intake pipe 17 and the exhaust pipe 18 together form part of the circulation path 20. The intake pipe 17 is formed in a cylindrical shape and allows fluid to pass therethrough. As will be described later, the combustion chamber CC contains argon (Ar) as a working gas and oxygen (O ₂ ) as an oxidant. It is an intake passage for supplying. In other words, when the intake valve 15 is opened, the oxidant and the working gas are supplied (intake) from the intake pipe 17 to the combustion chamber CC via the intake port 11b. On the other hand, the exhaust pipe 18 is formed in a cylindrical shape so that a fluid can pass therethrough. As will be described later, as an exhaust gas after combustion of hydrogen (H ₂ ) as a fuel, the exhaust pipe 18 serves as a working gas from the combustion chamber CC. This is an exhaust passage for discharging argon (Ar) and water vapor (H ₂ O). That is, when the exhaust valve 16 is opened, the combustion chamber CC exhausts water vapor and working gas to the exhaust pipe 18 through the exhaust port 11c as exhaust gas after combustion of fuel.

The circulation path 20 can circulate the working gas contained in the exhaust gas exhausted to the exhaust pipe 18 from the exhaust side to the intake side of the combustion chamber CC and supply it to the combustion chamber CC again. The circulation path 20 includes the intake port 11b and the exhaust port 11c described above, and a circulation passage 21 that connects the other end of the intake port 11b and the other end of the exhaust port 11c. As a result, the circulation path 20 and the combustion chamber CC form a closed space. The circulation passage 21 is formed in a cylindrical shape and allows fluid to pass therethrough. The intake pipe 17 and the exhaust pipe 18 described above form part of the circulation passage 21.

This working gas circulation engine 1 is filled with working gas in a closed space composed of the circulation path 20 and the combustion chamber CC. The working gas circulation engine 1 circulates the working gas through the intake pipe 17 of the circulation path 20, the intake port 11b into the combustion chamber CC, the exhaust port 11c of the circulation path 20 from the combustion chamber CC, the exhaust pipe 18, and the exhaust gas. The air is circulated from the port 11c and the exhaust pipe 18 to the intake pipe 17 and the intake port 11b through the circulation passage 21 again. That is, the circulation path 20 connects the intake side (intake port 11b side) and the exhaust side (exhaust port 11c side) of the combustion chamber CC outside the combustion chamber CC, and again without releasing the working gas to the atmosphere. Supply to combustion chamber CC. Furthermore, the circulator 20 has both ends communicating with the combustion chamber CC, an exhaust gas containing water vapor and working gas flows from one end into the combustion chamber CC, and an oxidant that the combustion chamber CC takes in from the other end. And the working gas can flow out to the combustion chamber CC. Here, in the working gas circulation engine 1, when the intake valve 15 is opened, the oxidant and working gas in the circulation passage 21 are supplied to the combustion chamber CC via the intake pipe 17 and the intake port 11b. Further, in the working gas circulation engine 1, when the exhaust valve 16 is opened, the exhaust gas in the combustion chamber CC is discharged to the circulation passage 21 through the exhaust port 11c and the exhaust pipe 18.

More specifically, the circulation path 21 of the circulation path 20 includes a first circulation path 21a, a second circulation path 21b, and a third circulation path 21c. The first circulation passage 21 a connects the other end of the intake port 11 b and a discharge port 32 a of an oxidant supply means 32 described later in the oxidant supply device 30. The second circulation passage 21b connects the other end of the exhaust port 11c and an exhaust gas inlet 60a of a condenser 60 as a condensing means described later. Further, the third circulation passage 21 c connects the working gas discharge port 60 b of the condenser 60 and the working gas introduction port 32 b of the oxidant supply means 32. The intake pipe 17 described above forms the first circulation passage 21a, while the exhaust pipe 18 forms the second circulation passage 21b.

Here, for example, a monoatomic gas is used as the working gas filled in the closed space formed by the circulation path 20 and the combustion chamber CC. The working gas of this embodiment has a higher specific heat ratio than air, and for example, a rare gas such as argon or helium, which is a monoatomic gas, is used. In the present embodiment, the working gas is described as using argon (Ar) as described above.

The oxidant supply device 30 supplies oxidant to the combustion chamber CC via the intake pipe 17 and the intake port 11b of the circulation path 20, and includes an oxidant storage tank 31, an oxidant supply means 32, an oxidant. A supply passage 33, a regulator 34, and an oxidant flow meter 35 are included.

The oxidant storage tank 31 stores the oxidant in a high pressure state. The oxidant supply means 32 supplies the oxidant stored in the oxidant storage tank 31 to the circulation passage 21. The oxidant supply passage 33 connects the oxidant storage tank 31 and the oxidant supply means 32. The regulator 34 and the oxidant flow meter 35 are provided on the oxidant supply passage 33. The regulator 34 and the oxidant flow meter 35 extend from the upstream side (oxidant storage tank 31 side) to the downstream side (oxidant supply means 32 side) with respect to the oxidant supply direction in the oxidant supply passage 33. The regulator 34 and the oxidant flow meter 35 are provided in this order.

Here, as the oxidant supply means 32 of the present embodiment, the oxidant flowing from the oxidant supply passage 33 and the working gas flowing from the circulation passage 21 through the working gas introduction port 32b are mixed, An oxidant mixing means is used for flowing the mixed oxidant and working gas from the discharge port 32a to the downstream side of the circulation passage 21 (the intake port 11b side). Therefore, the oxidant supply device 30 of the present embodiment can not only supply the oxidant to the circulation passage 21 but also mix it with the working gas passing through the circulation passage 21 and send it to the circulation passage 21. As a result, the oxidant is supplied to the combustion chamber CC together with the working gas via the intake port 11b when the intake valve 15 is opened.

The regulator 34 adjusts the pressure downstream of the regulator 34 in the oxidant supply passage 33 (the oxidant flow meter 35 side) to a target pressure according to a command from the electronic control unit 50. In other words, the regulator 34 controls the flow rate of the oxidant in the oxidant supply passage 33. The oxidant flow meter 35 is a means for measuring the flow rate of the oxidant in the oxidant supply passage 33 and measures the flow rate of the oxidant adjusted by the regulator 34. The measurement signal of the oxidant flow meter 35 is transmitted to the electronic control unit 50.

Here, oxygen (O ₂ ) is used as the oxidant supplied by the oxidant supply device 30 as described above. That is, the oxidant storage tank 31 of the present embodiment stores oxygen (O ₂ ) as an oxidant at a high pressure of, for example, about 70 MPa, and the oxidant supply means 32 circulates this high pressure oxygen (O ₂ ) through the circulation path. 21.

The fuel supply device 40 supplies fuel to the combustion chamber CC, and includes a fuel storage tank 41, a fuel injection means 42, a fuel supply passage 43, a regulator 44, a fuel flow meter 45, a surge tank 46, and the like. It is comprised including.

The fuel storage tank 41 stores fuel in a high pressure state. The fuel injection means 42 injects the fuel stored in the fuel storage tank 41 into the combustion chamber CC. The fuel supply passage 43 connects the fuel storage tank 41 and the fuel injection means 42. The regulator 44, the fuel flow meter 45, and the surge tank 46 are provided on the fuel supply passage 43. The regulator 44, the fuel flow meter 45, and the surge tank 46 are directed from the upstream side (the fuel storage tank 41 side) to the downstream side (the fuel injection means 42 side) with respect to the fuel supply direction in the fuel supply passage 43. The regulator 44, the fuel flow meter 45, and the surge tank 46 are provided in this order.

Here, the fuel injection means 42 of the present embodiment is provided in the cylinder head 11 so that the fuel can be directly injected into the combustion chamber CC. The fuel injection means 42 is a so-called fuel injection valve controlled by the electronic control unit 50. The electronic control unit 50 controls the fuel injection timing and the injection amount in accordance with the operating state such as the engine speed.

The regulator 44 adjusts the pressure downstream of the regulator 44 in the fuel supply passage 43 (on the fuel flow meter 45 and surge tank 46 side) to the set pressure. In other words, the regulator 44 controls the flow rate of the fuel in the fuel supply passage 43. The fuel flow meter 45 is a means for measuring the fuel flow rate in the fuel supply passage 43 and measures the fuel flow rate adjusted by the regulator 44. The measurement signal of the fuel flow meter 45 is transmitted to the electronic control device 50. The surge tank 46 is intended to reduce pulsation generated in the fuel supply passage 43 when fuel is injected by the fuel injection means 42.

Here, as the fuel supplied by the fuel supply device 40, a fuel that promotes combustion by an oxidant and generates water vapor by this combustion is used. In this embodiment, hydrogen (H ₂ ) is used as described above. Is used. That is, the fuel storage tank 41 of the present embodiment stores hydrogen (H ₂ ) as fuel at a high pressure of, for example, about 70 MPa, and the fuel injection means 42 injects this high pressure hydrogen (H ₂ ) into the combustion chamber CC. To do.

The working gas circulation engine 1 of the present embodiment supplies hydrogen (H ₂ ) as fuel and oxygen (O ₂ ) as an oxidant into the combustion chamber CC, and diffuses and burns hydrogen (H ₂ ). Illustrate. That is, the working gas circulation engine 1 configured as described above includes high-pressure hydrogen (H ₂ ) in high-temperature compressed gas (oxygen (O ₂ ) and argon (Ar)) formed in the combustion chamber CC. ) by injecting, the hydrogen (part of H ₂₎ is self-ignited, hydrogen (H ₂₎ and compressed gas (oxygen (O ₂₎₎ and is burned while mixing diffusion. By combustion of hydrogen (H ₂ ) in the combustion chamber CC, in the combustion chamber CC, hydrogen (H ₂ ) and oxygen (O ₂ ) are combined to generate water vapor (H ₂ O), and Argon (Ar) having a large specific heat ratio causes thermal expansion. As a result, in the working gas circulation engine 1, the piston 13 is pushed down by the diffusion combustion of hydrogen (H ₂ ) and the thermal expansion of argon (Ar), thereby generating power.

When the working gas circulation engine 1 completes the combustion of hydrogen (H ₂ ) and the thermal expansion of argon (Ar) (for example, when the piston 13 is located near the bottom dead center), As the exhaust valve 16 is opened, exhaust gas containing water vapor (H ₂ O) and argon (Ar) is discharged from the combustion chamber CC to the exhaust pipe 18 through the exhaust port 11c. Here, argon (Ar) in the exhaust gas discharged is circulated from the exhaust side to the intake side of the combustion chamber CC via the circulation path 20 in order to increase the thermal efficiency of the engine body 10, and again from the intake side to the combustion chamber. It is necessary to supply to CC. However, water vapor (H ₂ O) in the exhaust gas discharged at the same time is a molecule composed of three atoms (triatomic molecule) and has a specific heat ratio smaller than that of argon (Ar) composed of a single atom. ) And the combustion chamber CC, the thermal efficiency of the engine body 10 may be reduced. For this reason, the working gas circulation engine 1 is provided with a means on the circulation path 20 for removing water vapor (H ₂ O) contained in the exhaust gas.

Specifically, the working gas circulation engine 1 includes a condenser 60 as a condensing means as means for removing water vapor (H ₂ O) contained in exhaust gas flowing through the circulation path 20. The working gas circulation engine 1 further includes a cooling water circulation path 61 as a heat exchange medium circulation path, a water pump 62, and a radiator 63 as a cooling means.

The condenser 60 is provided in the circulation path 20 to condense the water vapor (H ₂ O) contained in the exhaust gas into condensed water (H ₂ O). The condenser 60 is provided between the second circulation passage 21b and the third circulation passage 21c on the circulation passage 21. That is, the condenser 60 is provided on the exhaust side of the oxidant supply means 32 on the circulation passage 21. The condenser 60 is connected so that the cooling water circulation path 61 passes through the inside.

The cooling water circulation path 61 circulates cooling water as a heat exchange medium through the condenser 60, and the cooling water can flow. The cooling water circulation path 61 is a closed annular path and is filled with cooling water.

The water pump 62 is provided on the cooling water circulation path 61, and the cooling water in the cooling water circulation path 61 can be circulated through the cooling water circulation path 61 by driving the water pump 62.

The radiator 63 is provided on the cooling water circulation path 61 and can cool the cooling water circulating in the cooling water circulation path 61. The radiator 63 of the present embodiment acts as a heat radiating means, and can cool the cooling water circulating through the cooling water circulation path 61 by the traveling wind of the vehicle on which the working gas circulation engine 1 is mounted.

Therefore, the condenser 60 circulates through the cooling water circulation path 61 and is circulated and supplied with the cooling water cooled by the radiator 63, thereby heat-exchanging the cooling water and the exhaust gas flowing through the circulation path 20. By cooling the exhaust gas, water vapor (H ₂ O) contained in the exhaust gas is liquefied and condensed to form condensed water (H ₂ O), which is separated from the exhaust gas. That is, the condenser 60 can separate the exhaust gas into argon (Ar) and condensed water (H ₂ O). At this time, the cooling water whose temperature has risen due to heat exchange by exchanging heat with the exhaust gas in the circulation path 20 in the condenser 60 is radiated when circulating through the cooling water circulation path 61 and again passing through the radiator 63. As a result, the temperature is lowered, that is, cooled. That is, the cooling water circulating in the cooling water circulation path 61 radiates the heat absorbed by the condenser 60 by the radiator 63.

The argon (Ar) separated by the condenser 60 is discharged to the third circulation passage 21 c through the working gas discharge port 60 b of the condenser 60. On the other hand, the condensed water (H ₂ O) separated by the condenser 60 is discharged to the condensed water passage 65 through the condensed water discharge port 60c of the condenser 60, and is stored outside the system of the circulation path 20, here described later. It is discharged to a condensed water storage tank 80 as a means.

The condenser 60 and the radiator 63 are configured to liquefy and condense water vapor (H ₂ O) in the exhaust gas when the hottest exhaust gas that can be assumed during engine operation is discharged from the combustion chamber CC. The exhaust gas temperature is set to a capacity (in other words, exhaust gas cooling performance) that can lower the exhaust gas temperature to a desired temperature.

Here, the exhaust gas discharged from the combustion chamber CC includes not only water vapor (H ₂ O) and argon (Ar) but also hydrogen (H ₂ ) or oxygen (O ₂ ). is there. For example, when the supply amount of hydrogen (H ₂ ) to the combustion chamber CC is larger than a predetermined amount with respect to oxygen (O ₂ ), unburned hydrogen (H ₂ ) remains and is discharged to the circulation path 20 as it is. Is done. When the supply amount of oxygen (O ₂ ) to the combustion chamber CC is larger than a predetermined amount with respect to hydrogen (H ₂ ), oxygen (O ₂ ) remains and is discharged to the circulation path 20 as it is. For this reason, hydrogen (H ₂ ) and oxygen (O ₂ ) in the exhaust gas are actuated by the condenser 60 together with argon (Ar) after the water vapor (H ₂ O) in the exhaust gas is separated by the condenser 60. The gas is discharged from the gas discharge port 60b to the third circulation passage 21c. Accordingly, hydrogen (H ₂ ) and oxygen (O ₂ ) in the exhaust gas are circulated through the circulation path 20 and supplied again to the combustion chamber CC, similarly to argon (Ar).

Therefore, the working gas circulation engine 1 detects the amount of hydrogen (H ₂ ) or oxygen (O ₂ ) in the gas (circulation gas) circulating in the circulation path 20 from the exhaust side to the intake side, and detects hydrogen (H ₂ ) Or oxygen (O ₂ ) to reach the combustion chamber CC, the injection amount of hydrogen (H ₂ ) from the fuel supply device 40 or the supply amount of oxygen (O ₂ ) from the oxidant supply device 30 is determined. It is adjusting. Thereby, the working gas circulation engine 1 can prevent excessive hydrogen (H ₂ ) or oxygen (O ₂ ) in the combustion chamber CC.

Specifically, the working gas circulation engine 1 is a fuel concentration detection means for detecting the concentration of fuel in the circulation gas circulating through the circulation path 20, here, a hydrogen concentration detection means for detecting the hydrogen concentration in the circulation gas. Specifically, a hydrogen concentration sensor 71 and an oxidant concentration detection means for detecting the concentration of the oxidant in the circulation gas, here an oxygen concentration detection means for detecting the oxygen concentration in the circulation gas, Specifically, an oxygen concentration sensor 72 is provided. Both the hydrogen concentration sensor 71 and the oxygen concentration sensor 72 are provided in the third circulation passage 21 c of the circulation passage 21. The hydrogen concentration sensor 71 and the oxygen concentration sensor 72 each transmit a detection signal to the electronic control unit 50. Therefore, the electronic control unit 50 grasps the remaining amount of hydrogen (H ₂ ) or oxygen (O ₂ ) in the circulating gas from each detection signal, and the hydrogen (H ₂ ) or oxygen (O ₂ ) is in the combustion chamber. The amount of hydrogen (H ₂ ) injected by the fuel injection means 42 or the target pressure of the regulator 34 (that is, the supply amount of oxygen (O ₂ )) is controlled in view of the time when it reaches CC.

In the working gas circulation engine 1 configured as described above, the piston 13 is pushed down due to the thermal expansion of argon (Ar) having a large specific heat ratio accompanying the combustion of hydrogen (H ₂ ) in the combustion chamber CC. The piston 13 repeats reciprocating motion in the cylinder bore 12a, so that the intake stroke, the compression stroke, the combustion stroke, and the exhaust stroke are set as one cycle, and this cycle is repeated. The reciprocating motion of the piston 13 is transmitted to a crankshaft (not shown) by the connecting rod 14, and the reciprocating motion is converted into a rotational motion by the action of the connecting rod 14 and the crankshaft, so that the crankshaft rotates. During this time, the electronic control unit 50 controls the rotation position of the crankshaft, the accelerator opening that is the amount of operation of an accelerator pedal (not shown) provided in the driver's seat of the vehicle, hydrogen (H ₂ ) or oxygen (O ₂ ) The hydrogen (H ₂ ) injection amount of the fuel injection means 42 or the target pressure of the regulator 34 (that is, the supply amount of oxygen (O ₂ )) is controlled according to the operating state such as the remaining amount of ₂ ).

Further, in the working gas circulation engine 1, the intake valve 15 and the exhaust valve 16 reciprocate as the crankshaft (not shown) rotates, and the communication between the circulation path 20 and the combustion chamber CC is repeatedly interrupted. Then, intake and exhaust are performed and the above four steps are repeated.

That is, in the working gas circulation engine 1, in the intake stroke, the intake valve 15 is opened, the exhaust valve 16 is closed, and the piston 13 is moved from the top dead center side to the bottom dead center side. Oxygen (O ₂ ) and argon (Ar) are taken into the combustion chamber CC via the intake pipe 17 and the intake port 11b of the circulation path 20.

Next, in the working gas circulation engine 1, in the compression stroke, the intake valve 15 is closed, both the intake valve 15 and the exhaust valve 16 are closed, and the piston 13 is moved from the bottom dead center to the top dead center. By moving to the side, oxygen (O ₂ ) and argon (Ar) in the combustion chamber CC are compressed and the temperature rises.

Next, the working gas circulation engine 1 supplies high-pressure hydrogen (H ₂ ) into the high-temperature compressed gas (oxygen (O ₂ ) and argon (Ar)) formed in the combustion chamber CC in the combustion stroke. By injecting, a part of this hydrogen (H ₂ ) is self-ignited, and hydrogen (H ₂ ) and compressed gas (oxygen (O ₂ )) are combusted while being diffusely mixed. Then, when hydrogen (H ₂ ) burns, argon (Ar) having a large specific heat ratio causes thermal expansion, and the piston 13 is caused by diffusion combustion of this hydrogen (H ₂ ) and thermal expansion of argon (Ar). Is pushed down, and the working gas circulation engine 1 generates power.

Next, in the working gas circulation engine 1, in the exhaust stroke, the intake valve 15 is kept closed, the exhaust valve 16 is opened, and the piston 13 is moved from the bottom dead center side to the top dead center side. By doing so, the exhaust gas containing water vapor (H ₂ O) and argon (Ar) is discharged from the combustion chamber CC to the exhaust pipe 18 via the exhaust port 11 c of the circulation path 20.

In the working gas circulation engine 1, exhaust gas containing water vapor (H ₂ O) and argon (Ar) is discharged from the combustion chamber CC to the circulation path 20, and the exhaust gas circulates toward the combustion chamber CC. When circulating through the path 20, water vapor (H ₂ O) in the exhaust gas is liquefied, condensed and separated by the condenser 60. As a result, the working gas circulation engine 1 does not supply steam (H ₂ O) having a small specific heat ratio to the combustion chamber CC, and again supplies argon (Ar) as a working gas having a large specific heat ratio to the combustion chamber CC. Therefore, operation with high thermal efficiency by working gas can be performed.

By the way, as described above, the working gas circulation engine 1 removes water vapor (H ₂ O) in the exhaust gas in the condenser 60 when the exhaust gas is circulated toward the combustion chamber CC as a circulation gas. . The working gas circulation engine 1 does not supply steam (H ₂ O) having a small specific heat ratio to the combustion chamber CC, but again supplies argon (Ar) as a working gas having a large specific heat ratio to the combustion chamber CC. So, it is operating with high thermal efficiency. At this time, the working gas circulation engine 1 discharges the condensed water (H ₂ O) separated by the condenser 60 from the condensed water discharge port 60 c to the condensed water passage 65 and drains it outside the circulation path 20. It is necessary to treat this condensed water (H ₂ O) appropriately.

Further, the working gas circulation engine 1 is provided with a condensed water storage tank for storing condensed water (H ₂ O), for example, so as to cover the exhaust pipe 18 through which high-temperature exhaust gas after combustion flows. The condensed water (H ₂ O) can be properly treated by evaporating the condensed water (H ₂ O) by using this, but in this case, the mountability is further improved. There is room. That is, when the working gas circulation engine 1 is provided with a condensed water storage tank so as to cover the exhaust pipe 18 as described above and evaporates this condensed water (H ₂ O) using the exhaust heat, the condensed water In order to bring the condensed water (H ₂ O) stored in the storage tank into contact with the outer surface of the exhaust pipe 18, the condensed water storage tank must be disposed in a limited mounting space near the exhaust pipe 18. For this reason, the working gas circulation engine 1 has less freedom in mounting the condensed water storage tank. For example, to ensure a sufficient capacity of the condensed water storage tank, the working gas circulation engine 1 is made larger. On the other hand, there is a risk that sufficient condensate storage tank capacity cannot be secured.

Therefore, the working gas circulation engine 1 of the present embodiment, as shown in FIG. 1, condensate water (H ₂ O) in which the exhaust heat of the exhaust gas is stored in the condensate storage tank 80 as storage means from the exhaust pipe 18. ) And an exhaust heat transfer section 90 serving as a transmission means for evaporating the condensed water (H ₂ O), so that proper condensate processing is performed and the working gas circulation engine 1 can be mounted. Has improved.

Here, the condensed water storage tank 80 is capable of storing condensed water (H ₂ O) separated by the condenser 60, and is connected to the condensed water passage 65. Therefore, the condensed water (H ₂ O) separated by the condenser 60 is discharged to the condensed water passage 65 via the condensed water discharge port 60 c of the condenser 60 and discharged to the condensed water storage tank 80.

The exhaust heat transfer section 90 transmits the exhaust heat of the high-temperature exhaust gas after combustion from the exhaust pipe 18 to the condensed water (H ₂ O) stored in the condensed water storage tank 80, and this condensed water (H ₂ O). Evaporate. In other words, the exhaust heat transfer unit 90 moves the exhaust heat of the exhaust gas from the exhaust pipe 18 to the condensed water (H ₂ O) stored in the condensed water storage tank 80.

The exhaust heat transfer unit 90 of the present embodiment includes an exhaust pipe side heat receiving unit 91, a tank side heat radiating unit 92, and a transfer unit 93. The exhaust pipe side heat receiving portion 91 is a portion that receives the exhaust heat of the exhaust gas from the exhaust pipe 18 and is provided in contact with the outer surface of the exhaust pipe 18. Tank-side heat radiating portion 92 is a portion for radiating the exhaust heat of condensed water (H 2 _O), the condensed water stored in the condensed water storage tank 80 (H 2 _O) and contactable to the condensate storage tank 80 Provided inside. The transmission portion 93 is a portion that transmits the exhaust heat received by the exhaust pipe side heat receiving portion 91 from the exhaust pipe 18 to the tank side heat radiating portion 92.

The exhaust heat transfer unit 90 is formed separately from the exhaust pipe 18 and uses a material having good thermal conductivity. Here, the exhaust heat transfer unit 90 may be formed of a material having corrosion resistance against weak acid at least at a tank side heat radiating unit 92, that is, a contact portion with condensed water (H ₂ O). Examples of materials having corrosion resistance against weak acid include, for example, tin (Sn), copper (Cu), lead (Pb), gold (Au), silver (Ag), or platinum (Pt). At least one material selected can be used. The exhaust heat transfer unit 90 of the present embodiment uses a copper tube as a material having a good thermal conductivity and having a corrosion resistance against weak acidity. In other words, the exhaust heat transfer unit 90 is formed by integrally forming the exhaust pipe side heat receiving unit 91, the tank side heat radiating unit 92, and the transmission unit 93 with a copper pipe.

The exhaust pipe side heat receiving portion 91 is formed by winding a copper pipe around the outer surface of the exhaust pipe 18. Thereby, the exhaust pipe side heat receiving portion 91 can sufficiently secure a contact area with the outer surface of the exhaust pipe 18, that is, a heat receiving area, and can efficiently receive the exhaust heat from the exhaust pipe 18.

Here, the exhaust pipe 18 provided with the exhaust pipe side heat receiving portion 91 is at a high temperature to such an extent that the heat amount capable of evaporating the condensed water (H ₂ O) from the tank side heat radiating portion 92 can be received from the exhaust heat. This is the portion of the exhaust pipe 18. In the present embodiment, the exhaust pipe 18 provided with the exhaust pipe side heat receiving portion 91 is the exhaust pipe 18 upstream of the condenser 60 with respect to the circulation direction of the working gas circulating in the circulation path 20. That is, the exhaust pipe side heat receiving portion 91 receives exhaust heat from the exhaust pipe 18 located between the exhaust port 11 c and the condenser 60 in the circulation direction of the working gas circulating in the circulation path 20.

The tank side heat radiating portion 92 is formed so as to meander the copper pipe in the condensed water storage tank 80. Thereby, the tank side heat radiating portion 92 can sufficiently secure a contact area with the condensed water (H ₂ O), that is, a heat radiating area, and efficiently radiate the exhaust heat to the condensed water (H ₂ O). be able to.

The transmission part 93 is formed integrally with the exhaust pipe side heat receiving part 91 and the tank side heat radiating part 92 so as to connect one end of the exhaust pipe side heat receiving part 91 and one end of the tank side heat radiating part 92. Thereby, the transmission part 93 can efficiently transmit the exhaust heat received by the exhaust pipe side heat receiving part 91 to the tank side heat radiating part 92.

In the working gas circulation engine 1 configured as described above, the exhaust pipe side heat receiving part 91 receives the exhaust heat of the high temperature exhaust gas from the exhaust pipe 18, and the transmission part 93 receives the exhaust heat from the exhaust pipe side heat receiving part. 91 to the tank side heat radiating portion 92. Then, in the working gas circulation engine 1, the tank-side heat radiating unit 92 radiates this exhaust heat to the condensed water (H ₂ O) stored in the condensed water storage tank 80, so condensed water exhaust heat of the exhaust gas from the exhaust pipe 18 (H 2 _O) was transferred to the condensed water (H 2 _O) can be evaporated Te. Therefore, the working gas circulation engine 1 can release the condensed water (H ₂ O) stored in the condensed water storage tank 80 to the atmosphere as water vapor (H ₂ O), and is thus separated by the condenser 60. The treated condensed water (H ₂ O) can be appropriately treated.

The working gas circulation engine 1 transmits the exhaust heat of the exhaust gas from the exhaust pipe 18 to the condensed water (H ₂ O) stored in the condensed water storage tank 80 by the exhaust heat transfer unit 90. Since (H ₂ O) is evaporated, for example, it is not necessary to directly contact the condensed water (H ₂ O) stored in the condensed water storage tank 80 and the outer surface of the exhaust pipe 18, and the limit in the vicinity of the exhaust pipe 18 is not necessary. It is not necessary to arrange the condensed water storage tank 80 in the mounted space. As a result, this working gas circulation engine 1 can improve the degree of freedom of the place where the condensed water storage tank 80 is mounted. Therefore, the working gas circulation engine 1 is, for example, intended to increase the size of the working gas circulation engine 1 in order to ensure a sufficient capacity of the condensed water storage tank 80, or conversely, a sufficient capacity of the condensed water storage tank 80. Can not be secured. In addition, the working gas circulation engine 1 transmits the exhaust heat of the exhaust gas from the exhaust pipe 18 to the condensed water (H ₂ O) stored in the condensed water storage tank 80 by the exhaust heat transfer unit 90. Since the condensed water (H ₂ O) is not in direct contact with the exhaust pipe 18, it is possible to prevent the exhaust pipe 18 from being locally lowered in temperature, and as a result, thermal distortion occurs in the exhaust pipe 18. This can be suppressed, and thus the durability of the exhaust pipe 18 can be improved.

Further, the working gas circulation engine 1 is configured such that the exhaust heat transfer unit 90 is converted into condensed water (H ₂ O) from the exhaust pipe 18 upstream of the condenser 60 with respect to the circulation direction of the working gas circulating in the circulation path 20. Since the exhaust heat is transmitted, the exhaust pipe side heat receiving portion 91 receives the exhaust heat of the exhaust gas before reaching the condenser 60 from the exhaust pipe 18, so that the temperature of the exhaust gas introduced into the condenser 60 is lowered. Can be made. As a result, since the working gas circulation engine 1 can reduce the temperature of the exhaust gas introduced into the condenser 60, the exhaust gas is exhausted to a temperature at which water vapor (H ₂ O) in the exhaust gas is liquefied and condensed. Since the capacities of the condenser 60 and the radiator 63 that can lower the gas temperature can be reduced, the condenser 60 and the radiator 63 can be reduced in size. In other words, since the working gas circulation engine 1 can reduce the temperature of the exhaust gas introduced into the condenser 60, the amount of heat that the cooling water takes from the exhaust gas in the condenser 60 can be reduced. The capacity of the device 60 and the radiator 63 can be reduced. In other words, the working gas circulation engine 1 can separate the water vapor (H ₂ O) from the exhaust gas by the condenser 60 and the radiator 63 having a relatively small capacity, thereby preventing a decrease in the average specific heat ratio of the working gas. Therefore, it is possible to maintain high efficiency operation while improving mountability. Here, the temperature of the exhaust gas after the exhaust pipe side heat receiving portion 91 is lowered by receiving the exhaust heat from the exhaust pipe 18 is a temperature at which condensed water (H ₂ O) is not generated.

Here, in the working gas circulation engine 1, carbon dioxide (CO ₂ ) may be contained in the exhaust gas discharged from the combustion chamber CC. In this case, the condensed water (H ₂ O) separated by the condenser 60 and stored in the condensed water storage tank 80 may have weak acidity due to the carbon dioxide (CO ₂ ) contained in the exhaust gas. There is. However, as described above, the working gas circulation engine 1 of the present embodiment has at least a contact portion of the exhaust heat transfer unit 90 with the condensed water (H ₂ O), that is, the tank side heat radiating unit 92 against weak acidity. Therefore, the corrosion of the tank side heat dissipating part 92 can be suppressed, and the durability of the exhaust heat transfer part 90 can be improved.

According to the working gas circulation engine 1 according to the embodiment of the present invention described above, with oxygen (O _2), water vapor (H 2 _O) by combustion with the combustion is promoted by the oxygen (O ₂₎ and generated hydrogen _{(H 2),} is supplied and argon (Ar), as an exhaust gas after combustion of hydrogen _{(H 2)} with argon with the combustion of hydrogen _{(H 2)} (Ar) is inflatable Combustion chamber CC in which water vapor (H ₂ O) and argon (Ar) can be exhausted to exhaust pipe 18 and argon (Ar) contained in the exhaust gas are circulated from the exhaust side to the intake side of combustion chamber CC and burned again. A circulation path 20 that can be supplied to the chamber CC, a condenser 60 that is provided in the circulation path 20 and that condenses water vapor (H ₂ O) contained in the exhaust gas into condensed water (H ₂ O), and condensed water ( H 2 _O) capable of storing a condensed water storage tank 80, and a condensed water (H 2 _O) was transferred to the condensed water (H 2 _O) exhaust heat conducting part 90 to evaporate the to be stored the exhaust heat of the exhaust gases in the condensed water storage tank 80 from the exhaust pipe 18 Prepare.

Therefore, the working gas circulation engine 1 transmits the exhaust heat of the exhaust gas from the exhaust pipe 18 to the condensed water (H ₂ O) stored in the condensed water storage tank 80 by the exhaust heat transfer unit 90 and transmits this condensed water (H ₂ O). Since H ₂ O) is evaporated, the degree of freedom of the place where the condensate storage tank 80 is mounted can be improved, and the mountability can be improved after appropriate condensate treatment.

Furthermore, according to the working gas circulation engine 1 according to the embodiment of the present invention described above, the exhaust heat transfer unit 90 is formed separately from the exhaust pipe 18 and is connected to the condensed water (H ₂ O). The contact portion is formed of a material having corrosion resistance against weak acid. Therefore, the working gas circulation engine 1 is formed of a material in which at least the contact portion of the exhaust heat transfer unit 90 with the condensed water (H ₂ O), that is, the tank side heat radiating unit 92 has corrosion resistance against weak acidity. Therefore, the corrosion of the tank side heat radiating portion 92 can be suppressed, the durability of the exhaust heat transfer portion 90 can be improved, and therefore the proper condensed water can be treated over a long period of time. .

Furthermore, according to the working gas circulation engine 1 according to the embodiment of the present invention described above, the exhaust heat transfer unit 90 is supplied from the condenser 60 with respect to the circulation direction of argon (Ar) circulating in the circulation path 20. Exhaust heat is transmitted from the upstream exhaust pipe 18 to the condensed water (H ₂ O). Therefore, the working gas circulation engine 1 exhausts the condensed water (H ₂ O) from the exhaust pipe 18 upstream of the condenser 60 with respect to the circulation direction of the working gas in which the exhaust heat transfer unit 90 circulates in the circulation path 20. Since the heat is transmitted, the temperature of the exhaust gas introduced into the condenser 60 can be lowered, and the capacity of the condenser 60 and the radiator 63 can be reduced. Therefore, the condenser 60 and the radiator 63 can be downsized. can do. As a result, the working gas circulation engine 1 can further improve the mountability.

(Embodiment 2)
FIG. 2 is a schematic configuration diagram of a working gas circulation engine according to the second embodiment of the present invention. The working gas circulation engine according to the second embodiment has substantially the same configuration as the working gas circulation engine according to the first embodiment, but includes a plurality of condensing means, and the working gas circulation engine according to the first embodiment. Is different. In addition, about the structure, effect | action, and effect which are common in embodiment mentioned above, while overlapping description is abbreviate | omitted as much as possible, the same code | symbol is attached | subjected.

The working gas circulation engine 201 according to the second embodiment includes two condensers 60 as condensing means, as shown in FIG. Therefore, the working gas circulation engine 201 includes two cooling water circulation paths 61 as the heat exchange medium circulation paths, a water pump 62, and a radiator 63 as the cooling means corresponding to the two condensers 60. In the present embodiment, the second circulation passage 21b of the circulation passage 21 is disposed on the end opposite to the combustion chamber CC side of the exhaust port 11c and on the downstream side with respect to the circulation direction of the working gas in the circulation path 20. The exhaust gas inlet 60a of the condenser 60 is connected.

The working gas circulation engine 201 of the present embodiment includes two exhaust heat transfer units 90 as transmission means. The exhaust pipe side heat receiving part 91 of one exhaust heat transfer part 90 is connected to the exhaust pipe 18 located between the exhaust port 11 c and the upstream condenser 60 with respect to the circulation direction of the working gas circulating in the circulation path 20. Receives exhaust heat. The exhaust pipe side heat receiving part 91 of the other exhaust heat transfer part 90 is located between the upstream condenser 60 and the downstream condenser 60 with respect to the circulation direction of the working gas circulating in the circulation path 20. The exhaust heat is received from the pipe 18. Therefore, this working gas circulation engine 201 is positioned between the exhaust pipe 18 positioned between the exhaust port 11 c and the upstream condenser 60, and between the upstream condenser 60 and the downstream condenser 60. The exhaust heat of the exhaust gas is transmitted from each exhaust pipe 18 to the condensed water (H ₂ O) stored in the condensed water storage tank 80 by the two exhaust heat transfer sections 90 corresponding to the exhaust pipe 18 that performs this condensed water. (H ₂ O) can be evaporated.

Even in this case, the working gas circulation engine 201 uses the two exhaust heat transfer units 90 to convert the exhaust heat of the exhaust gas from each exhaust pipe 18 to the condensed water (H ₂ O) stored in the condensed water storage tank 80. ) To evaporate the condensed water (H ₂ O), so that the degree of freedom of the place where the condensed water storage tank 80 is mounted can be improved. Can be improved.

(Embodiment 3)
FIG. 3 is a schematic configuration diagram of a working gas circulation engine according to Embodiment 3 of the present invention. The working gas circulation engine according to the third embodiment has substantially the same configuration as the working gas circulation engine according to the first embodiment, but the structure of the heat exchange medium circulation path is different from that of the working gas circulation engine according to the first embodiment. Different. In addition, about the structure, effect | action, and effect which are common in embodiment mentioned above, while overlapping description is abbreviate | omitted as much as possible, the same code | symbol is attached | subjected.

The working gas circulation engine 301 according to the present embodiment includes a cooling water circulation path 361 as a heat exchange medium circulation path. The cooling water circulation path 361 of the present embodiment is configured such that a part thereof is in contact with condensed water (H ₂ O) stored in the condensed water storage tank 80. Here, the cooling water circulation path 361 has a circulation path heat radiation part 361a in the path, and this circulation path heat radiation part 361a is in contact with the condensed water (H ₂ O) stored in the condensed water storage tank 80. Composed.

The circulation path heat radiation part 361 a is provided on the downstream side of the condenser 60 and the upstream side of the radiator 63 with respect to the circulation direction of the cooling water circulating in the cooling water circulation path 361. The circulation path heat radiation part 361 a is formed so as to meander a part of the cooling water circulation path 361 in the condensed water storage tank 80. Thus, circulation heat radiating portion 361a, the contact area between the condensed water (H 2 _O), i.e., it is possible to secure a sufficient heat radiation area, it dissipates heat efficiently in the condensed water (H 2 _O) Can do.

Therefore, the cooling water circulation path 361 uses the condensed water (H ₂ O) and heat stored in the condensed water storage tank 80 after the heat exchange with the exhaust gas and before the cooling by the radiator 63 in the circulation water radiator 361a. It can be circulated interchangeably.

In the working gas circulation engine 301 configured as described above, the cooling water circulating in the cooling water circulation path 361 exchanges heat with the exhaust gas in the circulation path 20 in the condenser 60, thereby absorbing heat and increasing the temperature. . Then, the cooling water whose temperature has risen circulates in the cooling water circulation path 61 and exchanges heat with the condensed water (H ₂ O) stored in the condensed water storage tank 80 by the circulation path heat radiation part 361a. Accordingly, the condensed water (H ₂ O) stored in the condensed water storage tank 80 is accelerated in temperature by receiving heat from the cooling water whose temperature has been increased in the condenser 60, and thus the condensed water storage tank 80. Evaporation of condensed water (H ₂ O) stored in is promoted.

On the other hand, the cooling water after circulating through the cooling water circulation path 361 and passing through the circulation path heat radiation part 361a exchanges heat with the condensed water (H ₂ O) stored in the condensed water storage tank 80 by the circulation path heat radiation part 361a. Thus, the temperature is lowered before being introduced into the radiator 63. As a result, since the working gas circulation engine 301 can further reduce the capacity of the radiator 63, the radiator 63 can be further downsized.

According to the working gas circulation engine 301 according to the embodiment of the present invention described above, the working gas circulation engine 301 uses the exhaust heat transfer unit 90 to transfer the exhaust heat of the exhaust gas from the exhaust pipe 18 to the condensed water storage tank 80. condensed water stored the (H 2 _O) was transferred to the condensed water (H 2 _O) from the evaporated, it is possible to improve the flexibility of the mounting location of the condensed water storage tank 80, an appropriate condensation Mountability can be improved after water treatment.

Furthermore, according to the working gas circulation engine 301 according to the embodiment of the present invention described above, the cooling water circulation path 361 for circulating the cooling water to the condenser 60 and the cooling water circulating through the cooling water circulation path 361 can be cooled. The condenser 60 circulates through the cooling water circulation path 361 and heat-exchanges the cooling water cooled by the radiator 63 and the exhaust gas flowing through the circulation path 20 to thereby contain water vapor ( H ₂ O) is condensed to be condensed water (H ₂ O) and separated from the exhaust gas, and the cooling water circulation path 361 stores the cooling water after heat exchange with the exhaust gas and before cooling by the radiator 63 as condensed water. Circulating the condensed water stored in the tank 80 so as to allow heat exchange.

Therefore, in this working gas circulation engine 301, the cooling water whose temperature has been increased by exchanging heat with the exhaust gas in the circulation path 20 in the condenser 60 circulates in the cooling water circulation path 361 and is stored in the condensed water storage tank 80. that condensed water and (H 2 _O) from the heat exchanger, it is possible to accelerate the evaporation of the condensed water stored in the condensed water storage tank 80 (H 2 _O). The working gas circulation engine 301 is introduced into the radiator 63 because the cooling water circulates through the cooling water circulation path 361 and exchanges heat with the condensed water (H ₂ O) stored in the condensed water storage tank 80. Since the temperature of the previous cooling water can be lowered, the capacity of the radiator 63 can be further reduced, and the radiator 63 can be further downsized. As a result, the working gas circulation engine 301 can more efficiently evaporate the condensed water (H ₂ O) stored in the condensed water storage tank 80, and achieve more appropriate condensed water treatment. In addition, the mountability can be further improved.

The working gas circulation engine according to the above-described embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims.

In the above description, the exhaust heat transfer unit 90 serving as a transmission means is made of a copper tube as a material having a good thermal conductivity and having a corrosion resistance against weak acid. Although the part 92 and the transmission part 93 were demonstrated as what is formed integrally, it is not restricted to this. The exhaust heat transfer section 90 as a transmission means is formed by forming the exhaust heat transfer section 90 and the transfer section 93 with a material having good thermal conductivity, and only the tank side heat radiating section 92 has corrosion resistance against weak acidity. You may form with the material which has. Further, the exhaust heat transfer section 90 as a transfer means does not necessarily need to be formed of a material that has corrosion resistance against weak acidity. Even in this case, the working gas circulation engine 1 can obtain the effect of improving the mountability after processing the appropriate condensed water.

Also, the transmission means of the present invention may use, for example, a heat pipe.

FIG. 4 is a schematic configuration diagram of a working gas circulation engine according to the first modification of the present invention. The working gas circulation engine 1A of the present modification includes a heat pipe 90A as a transmission means. In the heat pipe 90A, for example, the heat receiving portion 91A provided at one end contacts the exhaust pipe 18, and the heat radiating portion 92A provided at the other end contacts the condensed water (H ₂ O) stored in the condensed water storage tank 80. The pipe includes a pipe material, a capillary material (wick) lined in the metal pipe, and a small amount of liquid enclosed in the metal pipe. When the heat receiving portion 91A, which is the end portion of the metal pipe on the exhaust pipe 18 side, is heated by the exhaust heat through the exhaust pipe 18, the heat pipe 90A becomes a vapor flow of the liquid in the metal pipe on the low temperature side. The exhaust heat is transferred from the exhaust pipe 18 to the condensed water (H ₂ O) by moving to the heat radiating portion 92A, which is the end of the condensed water storage tank 80 on the condensed water (H ₂ O) side. The heat pipe 90A serving as the transmission means is configured such that when the vapor in the metal pipe is cooled by the heat radiating portion 92A that is the end portion on the condensed water (H ₂ O) side, the condensed liquid is exhausted by a capillary phenomenon. Circulate to the end of the side.

Even in this case, the working gas circulation engine 1A transmits the exhaust heat of the exhaust gas from the exhaust pipe 18 to the condensed water (H ₂ O) stored in the condensed water storage tank 80 through the heat pipe 90A. Since the condensed water (H ₂ O) is evaporated, the degree of freedom of the place where the condensed water storage tank 80 is mounted can be improved, and the mountability can be improved after processing the appropriate condensed water. it can.

Further, the transmission means of the present invention may use a heat medium, for example.

FIG. 5 is a schematic configuration diagram of a working gas circulation engine according to the second modification of the present invention. The working gas circulation engine 1B of this modification includes a heat medium circulation path 90B as a transmission means. The heat medium circulation path 90B circulates the heat medium between the heat receiving part 91B provided on the exhaust pipe 18 side and the heat radiating part 92B provided on the condensed water storage tank 80 side, and the heat medium can flow inside. It is. The heat medium circulation path 90B is a closed annular path, and the inside is filled with the heat medium. And when the heat receiving part 91B which is a part at the side of the exhaust pipe 18 is heated by exhaust heat through the exhaust pipe 18, the heat medium circulation path 90B is condensed water whose heat medium in the heat medium circulation path 90B is on the low temperature side. The exhaust heat is transferred from the exhaust pipe 18 to the condensed water (H ₂ O) by moving to the heat radiating portion 92B of the storage tank 80 on the condensed water (H ₂ O) side. Then, when the heat medium in the heat medium circuit 90B is cooled by the heat radiating portion 92B, which is a part on the condensed water (H ₂ O) side, the heat medium is again turned on. It recirculates to the heat receiving portion 91B on the exhaust pipe 18 side.

Even in this case, the working gas circulation engine 1B transmits the exhaust heat of the exhaust gas from the exhaust pipe 18 to the condensed water (H ₂ O) stored in the condensed water storage tank 80 through the heat medium circulation path 90B. Since this condensed water (H ₂ O) is evaporated, the degree of freedom of the place where the condensed water storage tank 80 is mounted can be improved, and the mountability is improved after processing the appropriate condensed water. be able to.

In the above description, the working gas circulation engine has been described as including the fuel injection means 42 so that the fuel is directly injected into the combustion chamber CC. However, the fuel injection means 42 supplies the fuel to the intake port 11b. It may be attached to the cylinder head 11 for injection. In other words, the working gas circulation engine of the present invention described above may be applied to a so-called port injection working gas circulation engine. Thus, the mountability can be improved.

In the above description, the working gas circulation engine has been exemplified as the one that diffuses and burns hydrogen (H ₂ ) as a fuel. However, the fuel is ignited by a spark plug (not shown), and so-called spark ignition combustion. Alternatively, the fuel may be ignited with a spark plug to assist the ignition and diffusely burned. That is, the working gas circulation engine of the present invention described above may be applied to a working gas circulation engine having a different combustion form, and even in this case, after processing proper condensed water, , Mountability can be improved.

As described above, the working gas circulation engine according to the present invention can improve the mountability, and the working gas contained in the exhaust gas is circulated from the exhaust side of the combustion chamber to the intake side to be combusted again. It is suitable for application to various working gas circulation engines that can be supplied to the chamber.

Claims

Combustion is promoted by the oxidant, fuel that generates water vapor by the combustion, and working gas are supplied, and the working gas can expand as the fuel burns, and the fuel A combustion chamber capable of exhausting the water vapor and the working gas into an exhaust pipe as exhaust gas after combustion;
A circulation path through which the working gas contained in the exhaust gas can be circulated from the exhaust side to the intake side of the combustion chamber and supplied again to the combustion chamber;
Condensation means provided in the circulation path to condense the water vapor contained in the exhaust gas into condensed water;
Storage means capable of storing the condensed water;
Transmission means for transmitting the exhaust heat of the exhaust gas from the exhaust pipe to the condensed water stored in the storage means and evaporating the condensed water,
Working gas circulation engine.
The transmission means is formed separately from the exhaust pipe, and the contact portion with the condensed water is formed of a material having corrosion resistance against weak acidity.
The working gas circulation engine according to claim 1.
The transmission means transmits the exhaust heat from the exhaust pipe upstream of the condensation means to the condensed water with respect to the circulation direction of the working gas circulating in the circulation path.
The working gas circulation engine according to claim 1 or 2.
A heat exchange medium circulation path for circulating the heat exchange medium in the condensing means;
Cooling means capable of cooling the heat exchange medium circulating in the heat exchange medium circulation path,
The condensing means heat-exchanges the water vapor contained in the exhaust gas by exchanging heat between the heat exchange medium circulated through the heat exchange medium circulation path and cooled by the cooling means and the exhaust gas flowing through the circulation path. Condensed to form the condensed water and separated from the exhaust gas,
The heat exchange medium circulation path circulates the heat exchange medium after heat exchange with the exhaust gas and before cooling by the cooling means so as to exchange heat with the condensed water stored in the storage means. And
The working gas circulation engine according to any one of claims 1 to 3.