JP2016035240A - External-combustion brayton cycle engine using solar heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an external-combustion Brayton cycle engine capable of stably supplying electric power without influence of the amount of insolation while using solar heat.SOLUTION: An external-combustion Brayton cycle engine using monoatomic gas as a first working medium (M1), comprises: a solar heater (3) heating the first working medium from a compressor (1); a hydrogen combustor (5) heating the first working medium from the compressor by hydrogen gas and oxygen gas; a hydrogen-oxygen generator (19) generating hydrogen gas and oxygen gas by electrolysis of water; a hydrogen flow passage switching device (25) selectively communicating a hydrogen tank (23) storing hydrogen with the hydrogen-oxygen generator or the hydrogen combustor; and an oxygen flow passage switching device (35) selectively communicating an oxygen tank (33) storing oxygen with the hydrogen-oxygen generator or the hydrogen combustor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an external combustion type Brayton cycle engine using sunlight as a heat source.

  In recent years, as a solution to environmental problems and energy problems, power generation technology using a turbine device that uses sunlight as a heat source, for example, steam turbines and gas turbines using solar heat have been proposed (for example, Patent Documents 1 and 2). ).

JP 2011-220163 A JP 2011-032960 A

  However, in such facilities that use solar heat, the supply of solar heat is unstable, so it is difficult to maintain a balance between power supply and demand. In other words, when the amount of sunshine is sufficient, the amount of power generated is excessive with respect to the power demand. On the other hand, when there is no sunshine, such as at night (nighttime), or when the amount of sunshine is insufficient, On the other hand, the power generation amount may be insufficient. Therefore, a load leveling system that uses surplus power when the amount of power generation is excessive is required for power generation facilities that use solar heat.

  Accordingly, an object of the present invention is to provide an external combustion Brayton cycle that can stably supply electric power without being affected by the amount of sunlight while using sunlight as a heat source with high efficiency in order to solve the above-described problems. To provide an engine.

  In order to achieve the above object, an external combustion type Brayton cycle engine according to the present invention is an external combustion type Brayton cycle engine using a monoatomic gas as a first working medium, and compresses the first working medium. The first working medium supplied from the compressor is heated by using solar light as a heat source, hydrogen gas and oxygen gas are burned, and the first working medium supplied from the compressor is A hydrogen combustor for heating, a first working medium supplied from the solar heater, and / or a turbine for extracting power from a mixed gas of the first working medium and steam supplied from the hydrogen combustor, and water A hydrogen / oxygen generator that generates hydrogen gas and oxygen gas by electrolysis, a hydrogen tank that stores hydrogen gas, an oxygen tank that stores oxygen gas, and the hydrogen tank A hydrogen flow switching device for selectively communicating the hydrogen gas between the hydrogen gas outlet of the hydrogen / oxygen generator and the hydrogen combustor, and the oxygen tank for connecting the oxygen gas to the hydrogen / oxygen generator. An oxygen flow switching device for selectively communicating between the outlet and the hydrogen combustor;

  According to this configuration, a high-efficiency external combustion Brayton cycle that uses sunlight as a heat source and uses, as a working medium, a monoatomic molecular gas having a larger specific heat ratio than a gas composed of diatomic molecules such as air. When the amount of power generation using sunlight exceeds the power demand in the engine, excess energy is stored as hydrogen gas and oxygen gas, and these gases are used to generate power when the amount of power generation using sunlight is insufficient. can do. Therefore, it is possible to stably supply power regardless of the amount of sunlight while using sunlight SL which is clean and inexpensive natural energy.

  In the external combustion Brayton cycle engine according to an embodiment of the present invention, a condenser that recovers water by cooling a mixed gas of the first working medium and water vapor discharged from the turbine, and recovered by the condenser It is preferable to provide a water supply path for supplying water to the hydrogen / oxygen generator. According to this configuration, since not only the working medium but also water used for the hydrogen combustor is circulated in the engine, the efficiency of the entire engine can be significantly increased.

  In the external combustion Brayton cycle engine according to an embodiment of the present invention, the first compression / expansion device compresses the hydrogen gas introduced into the hydrogen tank and expands the hydrogen gas derived from the hydrogen tank, and the oxygen A second compression / expansion device that compresses the oxygen gas introduced into the tank and expands the oxygen gas led out of the oxygen tank; and the hydrogen gas is provided between the first compression / expansion device and the hydrogen tank. A first heat storage device that absorbs and stores heat of hydrogen gas introduced into the tank, and is provided between the second compression / expansion device and the oxygen tank, and heat of the oxygen gas introduced into the oxygen tank is stored. It is preferable to further include a second heat storage device that absorbs and stores. According to this configuration, when the hydrogen gas and oxygen gas are compressed and stored, heat is stored in the heat storage device, and when the stored gas is reused, the gas is heated by the heat storage device to compress and store. Power can be recovered efficiently.

  A combined engine system according to the present invention is a combined engine system including the external combustion Brayton cycle engine including the condenser and an organic Rankine cycle engine using a fluid made of an organic substance as a second working medium. The second working medium is heated by the mixed gas passing through the condenser. According to this configuration, the organic Rankine cycle engine is operated using the latent heat of the steam used for the operation of the external combustion Brayton cycle engine, so that the efficiency of the entire engine system can be increased.

  In the hybrid engine system according to an embodiment of the present invention, the condenser is provided in a working medium return path that returns the first working medium from the turbine to the compressor, and the working medium return path includes the condenser. An internal pressure adjusting unit for adjusting the internal pressure of the first working medium in the working medium return path is connected. According to this configuration, the internal pressure of the condenser can be adjusted to a pressure at which the latent heat of water vapor can be utilized to the maximum by the internal pressure adjusting unit. Therefore, the efficiency of the entire engine system can be greatly increased.

  According to the external combustion Brayton cycle engine according to the present invention, as described above, it is possible to stably supply electric power without being influenced by the amount of sunlight while using sunlight as a heat source with high efficiency.

1 is a block diagram showing a schematic configuration of an external combustion Brayton cycle engine and a combined engine system according to an embodiment of the present invention. It is a block diagram which shows an example of operation | movement of the Brayton cycle engine of FIG. It is a block diagram which shows the other example of operation | movement of the Brayton cycle engine of FIG. It is a block diagram which shows the example of arrangement | positioning of the solar heater and hydrogen combustor which are used for the Brayton cycle engine of FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a combined engine system (hereinafter simply referred to as “engine system”) S including an external combustion Brayton cycle engine (hereinafter referred to as “first engine”) E1 according to an embodiment of the present invention. It is a block diagram. The first engine E1 uses solar light SL as a heat source and uses a monoatomic gas as a working medium (first working medium) M1. In the present embodiment, helium gas is used as the first working medium M1. The composite engine system S includes an organic Rankine cycle engine (hereinafter referred to as “second engine”) E2 that uses a fluid made of an organic substance as a working medium (second working medium) M2.

  The first engine E1 includes a compressor 1 that compresses the first working medium M1, a solar heater 3 and a hydrogen combustor 5 that heat the first working medium M1 compressed by the compressor 1, and the heated first A turbine 7 that extracts power from the working medium M1 (that is, at least one of the first working medium M1 supplied from the solar heater and the mixed gas MG of the first working medium M1 and steam supplied from the hydrogen combustor 5). I have. In the present embodiment, the first engine E1 is configured as a closed-cycle engine that supplies the first working medium M1 discharged from the turbine 7 to the compressor 1 for reuse. A load such as the first generator G1 is driven by the output of the first engine E1.

  The compressor 1 includes a low-pressure compressor unit 1a and a high-pressure compressor unit 1b, and an intermediate cooler 11 that uses cooling water is provided between the low-pressure compressor unit 1a and the high-pressure compressor unit 1b. Yes. By cooling the first working medium M1 compressed by the low-pressure compressor unit 1a by the intermediate cooler 11, the compression work of the high-pressure compressor unit 1b is reduced, and the efficiency is improved. The high-pressure first working medium M1 compressed by the compressor 1 passes through the recuperator 13 provided on the working medium supply path 18 that supplies the first working medium M1 from the compressor 1 to the turbine 7. It is sent to the solar heater 3 (or hydrogen combustor 5). The recuperator 13 preheats the first working medium M1 from the compressor 1 toward the solar heater 3 (or the hydrogen combustor 5) using the heat of the high-temperature first working medium M1 discharged from the turbine 7. To do.

  The solar heater 3 disposed between the compressor 1 and the turbine 7 receives the sunlight SL supplied from the light collecting device 17 installed outside the first engine E1, and uses the sunlight SL as a heat source. 1 The working medium M1 is heated. In the present embodiment, a large number of mirrors MR whose angles can be adjusted so as to collect light toward the solar heater 3 are used as the solar light collector 17.

  The hydrogen combustor 5 is disposed in the working medium supply path 18 downstream of the solar heater 3, that is, between the solar heater 3 and the turbine 7. The hydrogen combustor 5 burns the hydrogen gas HG with the oxygen gas OG, and heats the first working medium M1 compressed by the compressor 1. The first engine E1 includes a hydrogen / oxygen generator 19 that generates hydrogen gas HG and oxygen gas OG by electrolyzing water. The hydrogen gas HG and the oxygen gas OG having an equivalent ratio generated by the hydrogen / oxygen generator 19 are supplied to the hydrogen combustor 5.

  The hydrogen gas outlet 21 of the hydrogen / oxygen generator 19, the hydrogen combustor 5, and the hydrogen tank 23 that stores the hydrogen gas HG are connected via a hydrogen flow switching device 25 that selectively communicates among them. Are connected to each other. Similarly, the oxygen flow outlet 31 of the hydrogen / oxygen generator 19, the hydrogen combustor 5, and the oxygen tank 33 for storing the oxygen gas OG are selectively connected to each other between the oxygen flow path switching device 35. Are connected to each other. More specifically, the hydrogen gas outlet 21 of the hydrogen / oxygen generator 19 is connected to the hydrogen flow switching device 25, and the hydrogen flow switching device 25 is connected to the hydrogen tank 23 via the hydrogen flow passage 27. While being connected, it is connected to the hydrogen inlet 5 a of the hydrogen combustor 5 through the hydrogen supply path 29. Similarly, the oxygen gas outlet 31 of the hydrogen / oxygen generator 19 is connected to the oxygen flow switching device 35, and the oxygen flow switching device 35 is connected to the oxygen tank 33 via the oxygen flow passage 37. At the same time, it is connected to the oxygen inlet 5 b of the hydrogen combustor 5 through the oxygen supply path 39.

  A hydrogen compression / expansion device 41 is provided in the middle of the hydrogen flow passage 27 connecting the hydrogen flow path switching device 25 and the hydrogen tank 23. Further, a hydrogen heat storage device 43 is provided between the hydrogen compression / expansion device 41 and the hydrogen tank 23 in the hydrogen flow passage 27. The hydrogen compression / expansion device 41 compresses the hydrogen gas HG flowing through the hydrogen flow passage 27 from the hydrogen flow switching device 25 side to the hydrogen tank 23 and introduced into the hydrogen tank 23, and the hydrogen gas led out from the hydrogen tank 23. HG is expanded.

  Similarly, an oxygen compression / expansion device 51 is provided in the middle of the oxygen flow passage 37 connecting the oxygen flow switching device 35 and the oxygen tank 33. Further, an oxygen heat storage device 53 is provided between the oxygen compression / expansion device 51 and the oxygen tank 33 in the oxygen flow passage 37. The oxygen compression / expansion device 51 compresses the oxygen gas OG that flows through the oxygen flow passage 37 from the oxygen flow switching device 35 side to the oxygen tank 33 and is introduced into the oxygen tank 33, and the oxygen gas led out from the oxygen tank 33. OG is expanded.

  The hydrogen compression / expansion device 41 is connected to the first motor generator 45 via a rotating shaft. When the hydrogen compression / expansion device 41 compresses the hydrogen gas HG, the first motor generator 45 functions as a motor that drives the hydrogen compression / expansion device 41 by receiving power from the first generator G1. On the other hand, when the hydrogen gas HG expands in the hydrogen compression / expansion device 41, the first motor generator 45 is driven by the hydrogen compression / expansion device 41 to generate power as a generator.

  Similarly, the oxygen compression / expansion device 51 is connected to the second motor generator 55 via a rotating shaft. When the oxygen compression / expansion device 51 compresses the oxygen gas OG, the second motor generator 55 receives power supplied from the first generator G1 and functions as a motor that drives the oxygen compression device. On the other hand, when the oxygen gas OG expands in the oxygen compression / expansion device 51, the second motor generator 55 is driven by the oxygen compression / expansion device 51 to generate power as a generator.

  A condenser 63 is provided in the middle of the working medium return path 61 for circulating the first working medium M1 discharged from the turbine 7 to the compressor 1. In the present embodiment, a condenser 63 is disposed on the downstream side of the recuperator 13 in the working medium return path 61. The condenser 63 recovers the water W by cooling the mixed gas MG of the first working medium M1 and the steam discharged from the turbine 7. The water W collected by the condenser 63 is sent to the hydrogen / oxygen generator 19 through the water supply path 65. The first working medium M1 from which moisture has been removed by the condenser 63 is sent to the compressor 1 side via the working medium return path 61.

  The first engine E1 has a power amount that can be generated by the operation of the solar heater 3 alone (hereinafter referred to as “base power generation amount”) and a power amount that is required for the first engine E1 (hereinafter “demand power amount”). The control device 71 controls the components of the first engine E1 according to the balance. The control device 71 controls at least the hydrogen flow path switching device 25 and the oxygen flow path switching device 35 among the components of the first engine E1. Hereinafter, the control of the first engine E1 by the control device 71 and the operation of the first engine E1 in each control state will be described.

  First, when the base power generation amount exceeds the demand power amount, for example, the control of the first engine E1 in the daytime in fine weather will be described with reference to FIG. In this case, the first working medium M <b> 1 compressed by the compressor 1 is preheated by the recuperator 13, heated only by the solar heater 3, passes through the hydrogen combustor 5, and is supplied to the turbine 7. The turbine 7 is driven. On the other hand, of the output of the first generator G1, that is, the base power generation amount that is excessive with respect to the demand power amount is supplied to the hydrogen / oxygen generator 19 via the transmission line PP indicated by a broken line in the figure. The Using this excess power, the hydrogen / oxygen generator 19 generates hydrogen gas HG and oxygen gas OG by electrolysis of water.

  In this case, the control device 71 switches the hydrogen flow path switching device 25 so that the hydrogen / oxygen generation device 19 and the hydrogen tank 23 communicate with each other, and switches the oxygen flow path switching device 35 with the hydrogen / oxygen generation device 19. It switches so that the oxygen tank 33 may communicate. The hydrogen gas HG generated by the hydrogen / oxygen generator 19 is introduced into the hydrogen tank 23 from the hydrogen outlet 21 through the hydrogen flow passage 27 and stored in the hydrogen tank 23. In the process, the hydrogen gas HG is compressed by the hydrogen compression / expansion device 41, and then cooled by the hydrogen heat storage device 43, and is hydrogenated at a high pressure (for example, several hundred atmospheres) and a normal temperature (for example, 50 ° C. to 100 ° C.). Stored in the tank 23. When the hydrogen gas HG is cooled in the hydrogen heat storage device 43, the heat taken from the hydrogen gas HG is stored in the hydrogen heat storage device 43. Similarly, the oxygen gas OG generated by the hydrogen / oxygen generator 19 is introduced from the oxygen outlet 31 through the oxygen flow passage 37 into the oxygen tank 33 and stored in the oxygen tank 33. In the process, the oxygen gas OG is compressed by the oxygen compression / expansion device 51, and then cooled by the oxygen heat storage device 53, and oxygen in a state of high pressure (for example, several hundred atmospheres) and room temperature (for example, 50 ° C to 100 ° C). Stored in the tank 33. When the oxygen gas OG is cooled in the oxygen heat storage device 53, the heat taken from the oxygen gas OG is stored in the oxygen heat storage device 53.

  Next, when the base power generation amount is less than the demand power amount, for example, control of the first engine E1 at night when sunlight cannot be used will be described with reference to FIG.

  In this case, the control device 71 switches the hydrogen flow path switching device 25 so that the hydrogen tank 23 and the hydrogen combustor 5 communicate with each other, and the oxygen flow path switching device 35 is switched between the oxygen tank 33 and the hydrogen combustor 5. Switch to communicate. The hydrogen gas HG stored in the hydrogen tank 23 is introduced into the hydrogen combustor 5 from the hydrogen inlet 5 a of the hydrogen combustor 5 through the hydrogen flow passage 27 and the hydrogen supply passage 29. In the process, the hydrogen gas HG is heated by the heat stored in the hydrogen heat storage device 43 in the hydrogen heat storage device 43, and then expanded in the hydrogen compression / expansion device 41 to drive the hydrogen compression / expansion device 41. Similarly, the oxygen gas OG stored in the oxygen tank 33 is introduced into the hydrogen combustor 5 from the oxygen inlet 5 b of the hydrogen combustor 5 through the oxygen flow passage 37 and the oxygen supply passage 39. In the process, the oxygen gas OG is heated by the heat stored in the oxygen heat storage device 53 in the oxygen heat storage device 53, and then expanded in the oxygen compression / expansion device 51 to drive the oxygen compression / expansion device 51.

  The first working medium M1 compressed by the compressor 1 is preheated by the recuperator 13, then heated by the hydrogen combustor 5, and a mixed gas of water vapor generated by the combustion of hydrogen and the first working medium M1 is generated. The turbine 7 is driven by being fed to the turbine 7. The first motor generator 45 and the second motor generator 55 are driven by the hydrogen compression / expansion device 41 and the oxygen compression / expansion device 51, respectively, to generate power as a generator. The output from these motor generators is also the output of the first engine E1.

  In addition, even in the daytime in fine weather when sunlight SL can be used, when the power demand is large and the demand power amount exceeds the base power generation amount, the hydrogen gas HG is supplied from the hydrogen tank 23 to the hydrogen combustor 5 and oxygen Both the solar heater 3 and the hydrogen combustor 5 may be operated by supplying oxygen gas OG from the tank 33.

  In the present embodiment, the solar heater 3 and the hydrogen combustor 5 are arranged in series in the working medium supply passage 18 between the compressor 1 and the turbine 7, but as shown in FIG. The heater 3 and the hydrogen combustor 5 may be arranged in parallel. As shown in FIG. 4B, the solar heater 3 and the hydrogen combustor 5 are arranged in series and then arranged upstream. Alternatively, a bypass passage 73 that bypasses the solar heater 3 may be provided.

  Note that the turbine 7 may be configured in two stages including a high-pressure turbine section and a low-pressure turbine section, and an additional heater may be provided between the high-pressure turbine section and the low-pressure turbine section. Further, in the first engine E1 of FIG. 1, the compressor 1 may be configured in one stage and the intermediate cooler 11 may be omitted.

  The second engine E2, which is an organic Rankine cycle engine, uses the exhaust heat of the first engine E1 to heat the organic substance, which is the second working medium, and supplies the second generator G2 via the expander (turbine) 81. To drive. Specifically, the second working medium M2 of the second engine E2 passes through the condenser 63 provided in the working medium return path 61 of the first engine E1 as a cooling medium, and in the condenser 63, the working medium return path. 61 is heated by the mixed gas flowing into the condenser 63 from 61. Examples of the organic material that can be used as the second working medium include, but are not limited to, chlorofluorocarbon and pentane.

  When the first engine E1 and the second engine E2 are combined and operated as the engine system S as described above, the first working medium M1 is placed in a portion between the condenser 63 and the compressor 1 in the working medium return path 61. A working medium tank 83 to be stored is connected via a pressure adjusting pump 85. The working medium tank 83 and the pressure adjusting pump 85 form an internal pressure adjusting unit 87 that adjusts the internal pressure in the working medium return path 61.

  By providing the internal pressure adjusting unit 87, it is possible to adjust the amount of heat given to the second working medium M2 of the second engine E2 in the condenser 63. That is, the internal pressure in the condenser 63 can be adjusted by the internal pressure adjusting unit 87, and thereby the condensation temperature of the water vapor flowing into the condenser 6 can be adjusted. For example, if the internal pressure in the condenser 63 is raised, the condensation temperature of the water vapor rises, so that the amount of heat given to the second working medium M2 in the condenser 63 increases. Thus, by providing the internal pressure adjustment unit, the latent heat of water vapor as a heating source of the second engine E2 that is an organic Rankine cycle engine can be utilized to the maximum extent.

  Next, the first working medium M1 of the first engine E1 when the first engine E1 is combined with the second engine E2 as described above and operated as the engine system S will be described.

  As described above, a gas composed of monoatomic molecules is used as the first working medium M1. Since the monoatomic molecular gas has a larger specific heat ratio than a gas composed of diatomic molecules such as air, high efficiency can be obtained even if the pressure ratio in the first engine E1 is set low. Therefore, since the pressure of the solar heater 3 can be set low, the reliability of the solar heater 3 can be improved and the cost can be reduced.

  The first working medium M1 may be a simple monoatomic gas such as helium as in the present embodiment, but the first working medium M1 is mixed with water vapor using the hydrogen combustor 5. When used, it is conceivable that the molecular weight of the monoatomic molecular gas is preferably closer to the molecular weight of water than to be significantly smaller than the molecular weight of water. In that case, for example, helium may be mixed with a monoatomic gas having a higher molecular weight, such as xenon, and used as the working medium M1.

  As described above, in the first engine E1 according to the present embodiment, a single atom that uses sunlight SL as a heat source and has a larger specific heat ratio as a working medium M1 than a gas composed of diatomic molecules such as air. In a highly efficient external combustion Brayton cycle engine using molecular gas, when the amount of power generation using solar light SL exceeds the power demand, excess energy is stored as hydrogen gas HG and oxygen gas OG, and these gases are stored in the sun. It is possible to generate power using the light SL when the power generation amount using the light SL is insufficient. Therefore, it is possible to stably supply power regardless of the amount of sunlight while using sunlight SL which is clean and inexpensive natural energy.

  Further, according to the composite engine system S according to the present embodiment, the second engine that is an organic Rankine cycle engine using the latent heat of water vapor used for the operation of the first engine E1 that is an external combustion type Brayton cycle engine. Since E2 is operated, the efficiency of the entire engine system S can be increased.

  As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention. Therefore, such a thing is also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Compressor 3 Solar heater 5 Hydrogen combustor 7 Turbine 19 Hydrogen / oxygen generator 21 Hydrogen gas outlet 23 Hydrogen tank 31 Oxygen gas outlet 33 Oxygen tank E1 First engine (external combustion Brayton cycle engine)
E2 2nd engine (Organic Rankine cycle engine)
M1 first working medium M2 second working medium

Claims (5)

An external combustion type Brayton cycle engine using monatomic gas as a first working medium,
A compressor for compressing the first working medium;
A solar heater that heats the first working medium supplied from the compressor using sunlight as a heat source;
A hydrogen combustor that burns hydrogen gas and oxygen gas to heat the first working medium supplied from the compressor;
A turbine for extracting power from a first working medium supplied from the solar heater and / or a mixed gas of the first working medium and steam supplied from the hydrogen combustor;
A hydrogen / oxygen generator that generates hydrogen gas and oxygen gas by electrolyzing water;
A hydrogen tank for storing hydrogen gas;
An oxygen tank for storing oxygen gas;
A hydrogen flow path switching device for selectively communicating the hydrogen tank between the hydrogen gas outlet of the hydrogen / oxygen generator and the hydrogen combustor;
An oxygen flow path switching device for selectively communicating the oxygen tank between an oxygen gas outlet of the hydrogen / oxygen generator and the hydrogen combustor;
External combustion type Brayton cycle engine equipped with.   2. The external combustion type Brayton cycle engine according to claim 1, wherein a condenser that recovers water by cooling a mixed gas of the first working medium and water vapor discharged from the turbine, and water recovered by the condenser are An external combustion Brayton cycle engine comprising a water supply path for supplying to the hydrogen / oxygen generator.   The external combustion type Brayton cycle engine according to claim 1 or 2, wherein the first compression / expansion device compresses the hydrogen gas introduced into the hydrogen tank and expands the hydrogen gas derived from the hydrogen tank, A second compression / expansion device that compresses oxygen gas introduced into the oxygen tank and expands the oxygen gas led out from the oxygen tank; and is provided between the first compression / expansion device and the hydrogen tank, Heat of oxygen gas introduced between the first heat storage device that absorbs and stores the heat of hydrogen gas introduced into the hydrogen tank, the second compression / expansion device, and the oxygen tank. An external combustion Brayton cycle engine further comprising a second heat storage device that absorbs and stores the heat. An external combustion Brayton cycle engine according to claim 2 or claim 3 that cites claim 2 or claim 2,
A combined engine system including an organic Rankine cycle engine using a fluid made of organic matter as a second working medium,
The second working medium is heated by the mixed gas flowing into the condenser as a heating medium.
Combined engine system.   5. The hybrid engine system according to claim 4, wherein the condenser is provided in a working medium return path for returning the first working medium from the turbine to the compressor, and the working medium return path includes A hybrid engine system to which an internal pressure adjusting unit for adjusting an internal pressure of the first working medium in the working medium return path is connected.

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