KR101790915B1 - Generator device - Google Patents

Abstract

The power generation device 1 includes an expander 14 for expanding a gas-phase working medium, a condenser 6 for condensing the working medium expanded by the expander 14, and a working medium, which is condensed by the condenser 6, A heater 10 for heating the working medium pressurized by the pump 8 with heat of a heat source medium and a heater 10 for heating the working medium in an overheated state at a predetermined temperature or higher, And cooling means (25) for cooling the cooling medium.

Description

{GENERATOR DEVICE}

The present invention relates to a power generation apparatus.

BACKGROUND ART Conventionally, as disclosed in Patent Document 1, a binary power generator for driving a generator by an expander installed in a circulation pipe through which a working medium circulates is known. 7, the evaporator 71, the inflator 72, the condenser 73, and the circulation pump 74 are connected in this order to the circulation pipe 75 in the binary power generation apparatus disclosed in Patent Document 1 . The evaporator 71 evaporates the working medium by using hot water discharged from a factory or hot water from a hot spring as a heat source medium. A temperature measuring means 76 is provided on the outlet side of the evaporator 71 in the flow path through which the heat source medium flows. Based on the measured value, the number of rotations of the circulation pump 74 is adjusted. That is, when the temperature of the hot water at the outlet side of the evaporator 71 becomes higher than the target value, the temperature of the hot water at the outlet side is lowered by raising the number of revolutions of the circulation pump 74.

In the binary power generation apparatus disclosed in Patent Document 1, when the temperature of the hot water as the heat source is raised, the rotation number of the circulation pump 74 is increased to lower the temperature of the hot water flowing out from the evaporator 71. Thus, the temperature of the hot water flowing out of the evaporator 71 can be held within a predetermined range. However, this binary power generation apparatus has a problem that it can not be coped with when the temperature of hot water (heat source medium) rises sharply. That is, when the temperature of the hot water at the outlet side of the evaporator 71 rises, the rotation speed of the circulation pump 74 is increased. However, when the temperature of the hot water is suddenly increased, The superheat of the evaporator outlet temporarily increases. Therefore, there is a problem that the packing of the flange existing in the path from the evaporator 71 to the inflator 72 must be made of a heat resistant material.

Japanese Patent Application Laid-Open No. 2013-181398

An object of the present invention is to make it possible to suppress the temperature rise of the working medium at the outlet side of the evaporator in the power generating device.

According to one aspect of the present invention, there is provided a power generation apparatus comprising: an expander for expanding a gas-phase working medium; a condenser for condensing the working medium expanded by the expander; a pump for pressurizing the working medium condensed by the condenser; A heater for evaporating at least a part of the working medium pressurized by the pump to heat of the heat source medium and a cooling means for cooling the working medium in an overheated state at a predetermined temperature or higher on the downstream side of the heater.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view schematically showing a configuration of a power generation apparatus according to a first embodiment of the present invention. FIG.
2 is a diagram for explaining the control operation in the power generation apparatus according to the first embodiment.
3 is a view schematically showing a configuration of a power generation apparatus according to a second embodiment of the present invention.
4 is a diagram for explaining a control operation in the power generation apparatus according to the second embodiment.
5 is a view schematically showing a configuration of a power generation apparatus according to another embodiment of the present invention.
6 is a view schematically showing a configuration of a power generation apparatus according to another embodiment of the present invention.
7 is a view schematically showing a configuration of a conventional binary power generation apparatus.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1, the power generation apparatus 1 according to the first embodiment is a power generation system using a Runkin cycle and includes a condenser 6, a circulation pump 8, an evaporator 10, an expander 14). The condenser 6, the circulation pump 8, the heater 10 and the inflator 14 are provided in this circulation flow path 4 in this order. In the power generation apparatus 1 according to the present embodiment, a circulation circuit is formed in which the working medium flows in order through the heater 10, the inflator 14, the condenser 6, and the circulation pump 8 through the circulation flow path 4 . As the working medium, a refrigerant whose boiling point is lower than that of water is used.

The inflator 14 is connected to the generator 16. By expanding the gas-phase working medium in the inflator 14, the force for driving the generator 16 can be taken out.

The condenser 6 serves to condense the gas-phase working medium discharged from the inflator 14 into a liquid working medium. The condenser 6 has a working medium flow path 6a through which a gaseous working medium flows and a cooling medium flow path 6b through which a cooling medium such as cooling water flows. The cooling medium flow path 6b is connected to the cooling circuit 61. [ A cooling medium such as cooling water supplied from the cooling circuit 61 flows into the cooling medium flow path 6b. The working medium flowing through the working medium flow path 6a is condensed by heat exchange with the cooling medium flowing through the cooling medium flow path 6b.

The circulation pump 8 is provided on the downstream side of the condenser 6 (between the heater 10 and the condenser 6) in the circulation flow passage 4, and the working medium is circulated in the circulation flow passage 4 To circulate. The circulating pump 8 pressurizes the liquid working medium condensed by the condenser 6 to a predetermined pressure and sends it to the heater 10. [ As the circulating pump 8, a centrifugal pump having an impeller as a rotor, a gear pump having a rotor as a pair of gears, or the like is used.

The heater 10 is provided on the downstream side of the circulation pump 8 in the circulation flow passage 4 (between the circulation pump 8 and the inflator 14). The heater 10 has a working medium flow path 10a through which a working medium flows and a heat source medium flow path 10b through which a heat source medium flows. The heat source medium flow path 10b is connected to a heat source medium circuit 62. A heat source medium supplied from an external heat source flows to the heat source medium flow path 10b. The working medium flowing through the working medium flow path 10a is evaporated by heat exchange with the heat source medium flowing through the heat source medium flow path 10b. Examples of the heat source medium include hot water and steam.

A shut-off valve (open / close valve) 21 is provided in the circulating flow path 4 between the heater 10 and the inflator 14. [ Although the shutoff valve 21 is normally opened, it is closed when the inflator 14 is stopped, for example, when the inflator 14 is abnormal.

A bypass means (23) and a cooling means (25) are provided in the circulation flow path (4). The bypass means 23 has a bypass path 23a bypassing the inflator 14 and an on-off valve 23b provided in the bypass path 23a. The opening / closing valve 23b is normally closed, but is opened when the inflator 14 is stopped, such as when the inflator 14 is rotating. The opening and closing valve 23b is opened so that the working medium flowing out of the heater 10 is introduced into the condenser 6 without being introduced into the inflator 14. [

The cooling means 25 is for cooling the gaseous working medium evaporated by the heater 10 (that is, for absorbing sensible heat from the working medium) and includes a cooling passage 25a and a cooling passage 25a And a cooling valve (open / close valve) 25b. One end of the cooling passage 25a is connected to a portion between the circulation pump 8 and the heater 10 in the circulation flow passage 4. [ Therefore, the liquid working medium flows into the cooling passage 25a. The other end of the cooling passage 25a is connected to a portion between the heater 10 and the inflator 14 in the circulation flow passage 4. [ As a result, the liquid working medium flowing through the cooling passage 25a is joined to the gas-phase working medium flowing out of the evaporator 10.

The cooling passage 25a is formed by a pipe having a diameter smaller than that of the pipe constituting the circulation flow passage 4. [ Therefore, a working medium having a flow rate sufficiently smaller than the working medium flowing through the circulating flow path 4 flows through the cooling passage 25a. Alternatively, alternatively, a throttling valve or capillary tube (not shown) may be provided in the cooling passage 25a.

The cooling valve 25b is normally closed, and is opened when receiving a command from the controller 30 to be described later.

A temperature sensor 32 and a pressure sensor 34 are provided in the circulating flow passage 4 between a portion to which the downstream end of the cooling passage 25a is connected and the inflator 14. [ The temperature sensor 32 detects the temperature of the working medium flowing out of the heater 10 and introduced into the shut-off valve 21 and the inflator 14. [ The pressure sensor 34 detects the pressure of the working medium flowing out of the evaporator 10 and introduced into the shut-off valve 21 and the inflator 14. [

The power generation apparatus 1 is provided with a controller 30 for controlling the drive of the circulation pump 8 and controlling the opening and closing of the open / close valves 21, 23b and 25b. The functions of the controller 30 include a pump control means 30a and a cooling control means 30b.

The pump control means 30a is means for controlling the rotation speed of the circulation pump 8 and is a means for controlling the rotation speed of the circulation pump 8 when the superheat degree of the working medium derived from the detection values of the temperature sensor 32 and the pressure sensor 34 is within a predetermined range The control of the circulation pump 8 is performed.

The cooling control means 30b is a means for controlling the opening and closing of the cooling valve 25b and performs opening and closing control of the cooling valve 25b based on the temperature of the working medium flowing out of the heater 10. That is, when it is determined from the detection values of the temperature sensor 32 and the pressure sensor 34 that the working medium on the downstream side of the heater 10 is in an overheated state, the cooling control means 30b controls the temperature sensor 32, (Reference temperature), it outputs a command for opening the cooling valve 25b. As the reference temperature, a temperature is set so as not to damage the packing (not shown) provided at the connection portion of the shutoff valve 21 and the like. That is, even when the packing is not made of a heat resistant material, the temperature of the working medium at the outlet of the heater 10 is controlled so as not to be damaged by the heat received from the working medium.

The cooling control means 30b performs the closing control of the cooling valve 25b so as to perform cooling in a range in which the working medium on the downstream side of the heater 10 is maintained above the saturation temperature. That is, the cooling control means 30b outputs a command to close the cooling valve 25b when a predetermined closing condition is established such that the working medium introduced into the inflator 14 is maintained at the saturation temperature or higher. The closed condition is, for example, that the superheat degree of the working medium obtained from the detection values of the temperature sensor 32 and the pressure sensor 34 is higher than a predetermined temperature. Further, the temperature of the working medium at this time is lower than the reference temperature.

Here, the operation of the power generation system according to the first embodiment will be described. At the time of normal operation, the shutoff valve 21 is opened while the shutoff valve 23b and the cooling valve 25b of the bypass passage 23a are closed.

When the circulation pump 8 is driven, the liquid working medium sent out from the circulation pump 8 flows into the working medium flow path 10a of the heater 10. The working medium is heated by the heat source medium flowing through the heat source medium flow path 10b and evaporated. The working medium evaporated by the heater 10 is introduced into the inflator 14. The working medium is introduced into the inflator 14, whereby the inflator 14 is rotationally driven, whereby the generator 16 is driven to generate electricity. The working medium expanded in the expander (14) is discharged to the circulating flow path (4). The gas-phase working medium discharged from the inflator 14 is introduced into the working medium flow path 6a of the condenser 6. In the condenser 6, the working medium is cooled and condensed by the cooling medium flowing through the cooling medium flow path 6b. The liquid working medium flows through the circulation flow passage 4 and is sucked into the circulation pump 8. In the circulating flow path 4, such circulation is repeated, and the generator 16 performs power generation.

The rotational speed of the circulation pump 8 is controlled so that the degree of superheat of the working medium on the downstream side of the heater 10 is within a predetermined range. 2, the detected values P1 and T1 of the pressure sensor 34 and the temperature sensor 32 are input to the controller 30 (step ST1), and the pump control means 30a determines whether or not this detection Based on the values P1 and T1, the circulation pump 8 is controlled so that the degree of superheat of the working medium is within a predetermined range (step ST2).

The cooling control means 30b then checks whether or not the operating medium is in an overheated state based on the detected values P1 and T1 of the pressure sensor 34 and the temperature sensor 32 and then detects the detection of the temperature sensor 32 It is determined whether or not the value T1 is equal to or lower than a preset reference temperature (upper limit value) Tr (steps ST3 and ST4). The overheated state is a state in which the temperature detection value T1 is higher than the saturation temperature of the working medium at the pressure detection value P1. When it is determined that the detected value T1 of the temperature sensor 32 exceeds the reference temperature Tr when the working medium is in an overheated state, the cooling valve 25b is opened (step ST5). Such a situation may occur when, for example, the temperature of the heat source medium introduced into the heater 10 suddenly rises, it becomes impossible to cope with an increase in the number of revolutions of the circulation pump 8.

When the cooling valve 25b is opened, a part of the liquid working medium discharged from the circulation pump 8 is classified into the cooling passage 25a. Then, the liquid working medium flowing in the cooling passage 25a is joined to the working medium in the overheated state in the circulating flow path 4. [ Therefore, the gaseous working medium flowing out of the heater 10 and flowing in the circulating flow path 4 toward the shutoff valve 21 and the inflator 14 is cooled by evaporation of the merged liquid working medium. The liquid working medium introduced from the cooling passage 25a to the portion downstream of the heater 10 in the circulating flow passage 4 flows into the circulating flow passage 4 flowing out from the heater 10, It does not require a large amount of heat as compared with the case of taking away the latent heat since the temperature can be lowered, that is, the sensible heat can be taken away. Therefore, the liquid working medium may be a small amount.

Further, since the cooling passage 25a is composed of a pipe having a diameter smaller than that of the circulation passage 4, a large amount of working medium is prevented from flowing through the cooling passage 25a. Therefore, the amount of the working medium flowing into the heater 10 through the circulating flow path 4 is not reduced so much as to affect the amount of the working medium held in the heater 10, and the superheat degree is hardly increased further .

It is determined whether or not the superheat degree SH calculated from the detected values T1 and P1 of the temperature sensor 32 and the pressure sensor 34 is equal to or higher than the reference superheat degree (lower limit value) SHr in a state where the cooling valve 25b is open (Step ST6). When the superheating degree SH becomes lower than the reference superheating degree SHr, the cooling valve 25b is closed (step ST7). Thereby, the working medium discharged from the circulation pump 8 is returned to the normal operation to be introduced into the heater 10 without being classified into the cooling passage 25a.

As described above, in the first embodiment, the cooling means 25 cools the working medium in a superheated state at a temperature on the downstream side of the heater 10 exceeding a predetermined value. Thus, the temperature of the working medium flowing out of the heater 10 and flowing into the inflator 14 can be suppressed. Therefore, even when the temperature of the heat source medium is rapidly increased, the temperature rise of the working medium can be effectively suppressed. This makes it unnecessary to form the packing of the flange existing in the path from the heater 10 to the inflator 14 to have heat resistance and to improve the degree of the insulating material used in the generator 16 No measures are required.

In the first embodiment, the working medium is cooled by joining the working medium classified from the upstream side of the heater 10 to the downstream side of the pump and the cooling means 25 joining the circulating flow path 4. This makes it possible to suppress the complication of the configuration of the power generation device 1 and also to cool the working medium more effectively.

Further, in the first embodiment, since the working medium on the downstream side of the heater 10 is maintained at the saturation temperature or more, it is possible to prevent the liquid working medium from being introduced into the inflator 14. [ Therefore, the power generation efficiency can be prevented from being lowered.

Further, in the first embodiment, since the working medium in an overheated state is cooled using the heat of vaporization of the working medium, the working medium can be cooled more effectively. That is, the working medium in an overheated state can be cooled with a slight amount of cooling medium. Particularly, since the working medium classified from the downstream side of the circulating pump 8 is used as the cooling medium, the amount of working medium sent from the circulating pump 8 to the heater 10 is only slightly reduced. Therefore, even if the refrigerant is separated from the working medium discharged from the circulation pump 8, there is little effect.

Fig. 3 shows a power generation apparatus 1 according to the second embodiment. In the electric power generating apparatus 1 according to the second embodiment, the cooling means 25 has a heat exchanger 25f for cooling the working medium in an overheated state by a heating medium such as steam, hot air or hot water introduced from outside . For example, the heat exchanger 25f is applied to a case where the heat source medium circuit 62 connected to the heater 10 is constituted by a flow path through which supercharged air flows to an engine (not shown). The heat exchanger 25f is provided on the downstream side of the heater 10 in the circulation circuit 4. [ Surplus steam may be introduced into the cooling passage 25e of the heat exchanger 25f from a steam facility (not shown) provided on a ship on which the engine is mounted. When the engine is under a high load operation, for example, supercharged air at about 150 ° C or higher is introduced into the heater 10. As a result, the working medium flowing through the working medium flow path 10a of the heater 10 is heated until it reaches a temperature of about 150 ° C. In this case, the opening degree of the cooling valve (pressure reducing means) 25b provided in the cooling passage 25a of the cooling means 25 is narrowed to reduce the temperature of the heating medium, thereby lowering the temperature of the heating medium. Thereby, the working medium in the overheated state flowing through the working medium flow path 25d of the heat exchanger 25f can be cooled. Further, when the engine is under low load operation, the working medium may not be sufficiently heated in the heater 10, and at this time, the heat exchanger 25f also functions as a superheater for heating the working medium to an overheated state can do.

4, in the power generation system according to this embodiment, it is checked whether or not the working medium is in an overheated state based on the detected values P1 and T1 of the pressure sensor 34 and the temperature sensor 32 Step ST3). When it is determined that the detected value T1 of the temperature sensor 32 exceeds the reference temperature Tr (step ST4) when the working medium is in an overheated state, the cooling control means 30b sets the cooling valve (Step ST11). Thereby, the heating medium is decompressed, and the working medium is cooled in the heat exchanger 25f (the sensible heat of the working medium is lost).

The degree of superheat SH calculated from the detected values T1 and P1 of the temperature sensor 32 and the pressure sensor 34 is greater than or equal to the reference superheat degree (lower limit value) SHr in the state in which the cooling valve 25b is being exchanged (Step ST6). When the superheating degree SH becomes lower than the reference superheating degree SHr, the control for exchanging the cooling valve 25b is released (step ST7). At this time, when the working medium is not sufficiently heated, the working medium can be supplementarily heated, and the superheating degree of the working medium can also increase the SH.

The present invention is not limited to the first and second embodiments described above, and various modifications and improvements can be made without departing from the spirit of the present invention. For example, in the first embodiment, the working medium classified from the circulating flow path 4 is joined to the working medium of the circulating flow path 4 at the downstream side of the heater 10, do. 5, the working medium classified into the cooling passage 25a and the working medium of the circulating flow passage 4 may indirectly be heat-exchanged.

Specifically, the cooling means 25 has a cooling heat exchanger 25c disposed on the downstream side of the heater 10 in the circulation flow passage 4. [ The cooling heat exchanger 25c is provided with a working medium flow path 25d connected to the circulation flow path 4 and a cooling flow path 25e connected to the cooling path 25a.

One end (upstream end) of the cooling passage 25a is connected to a portion between the circulation pump 8 and the heater 10 in the circulation flow passage 4. [ The other end (downstream end) of the cooling passage 25a is connected to a portion between the inflator 14 and the condenser 6 in the circulation flow passage 4. [ Since the downstream end of the cooling passage 25a is located on the suction side of the circulation pump 8 in the circulation flow passage 4, the working medium classified in the cooling passage 25a is easy to flow.

The liquid working medium classified from the circulating flow path 4 into the cooling passage 25a vaporizes while cooling the operating medium of the working medium flow path 25d in the overheated state in the cooling heat exchanger 25c. The vaporized working medium is returned from the cooling passage 25a to the upstream side of the condenser 6 in the circulating flow passage 4. [

In the first embodiment, the working medium in an overheated state is cooled by a liquid working medium. 6, the working medium in an overheated state may be cooled by the cooling medium (cooling water) of the cooling circuit 61 that has passed through the condenser 6. [ Concretely, one end (upstream end) of the cooling passage 25a is connected to a portion on the downstream side of the condenser 6 in the cooling circuit 61. The cooling medium flowing in the cooling passage 25a is returned to the cooling circuit 61. [ In this configuration, in the cooling heat exchanger 25c, the cooling medium in the cooling passage 25e cools the working medium in the working medium passage 25d in the overheated state.

In each of the above-described embodiments, a jacket for covering a part of the piping portion between the heater 10 and the inflator 14 of the circulation flow path 4 is provided, and the heater 10 is provided by flowing the working medium or the cooling fluid in the jacket. May be indirectly cooled.

The cooling valve 25a may be an opening degree adjustable valve.

Here, the above embodiment will be schematically described.

In the above embodiment, the cooling means cools the working medium in which the temperature at the downstream side of the heater is in an overheated state at a predetermined value or more. As a result, the temperature of the working medium flowing out of the heater and flowing into the inflator can be suppressed. Therefore, even when the temperature of the heat source medium rises sharply, the temperature rise of the working medium can be effectively suppressed. As a result, there is no need to form a packing or the like of the flange existing in the path from the heater to the inflator to have heat resistance, and measures such as raising the rank of the insulating material used in the generator are also eliminated.

The cooling means may be configured to cool the working medium in the overheated state by a working medium that is downstream from the pump and is classified from the upstream side of the heater. In this configuration, since the working medium discharged from the pump is cooled by the working medium in an overheated state, it is possible to suppress the complication of the configuration of the power generation device.

The cooling means may be configured to cool the working medium in the overheated state by joining the working medium classified from the downstream side of the pump to the working medium on the downstream side of the heater. In this configuration, the working medium classified from the downstream side of the pump joins the working medium in the overheated state, thereby cooling the working medium. Therefore, the working medium can be cooled more effectively.

The cooling means may be cooled within a range in which the working medium on the downstream side of the heater is maintained at the saturation temperature or higher. In this configuration, it is possible to prevent the liquid working medium from being introduced into the inflator. Therefore, the power generation efficiency can be prevented from being lowered.

The cooling means may cool the working medium in an overheated state by using the heat of vaporization. In this mode, since the working medium in an overheated state is cooled using the heat of vaporization, the working medium can be cooled more effectively. That is, the working medium in an overheated state can be cooled by a small amount of cooling medium. Particularly, when the working medium classified from the downstream side of the pump is used as the cooling medium, the amount of working medium sent from the pump to the evaporator is only slightly reduced. Therefore, even if the pump is divided from the working medium discharged from the pump, there is almost no influence.

The cooling means may include a heat exchanger having a working medium flow path and a cooling flow path and disposed on a downstream side of the heater and a decompression means provided on a heating medium circuit connected to the cooling flow path. The decompression means may decompress the heating medium so that the working medium is cooled in the heat exchanger when the working medium is in an overheated state and a predetermined temperature or more.

In this mode, when the working medium is in an overheated state and a predetermined temperature or more, in the heat exchanger, the working medium flowing through the working medium flow path is reduced in pressure by the pressure reducing means of the heating medium circuit and cooled by the heating medium flowing through the cooling flow path. On the other hand, when the working medium in the heater is not sufficiently heated, the working medium is heated by the heating medium in the heat exchanger. Thus, the heat exchanger can cool the working medium when the working medium is overheated, while it can supplementarily heat the working medium if the working medium is not sufficiently heated.

As described above, according to the embodiment, it is possible to suppress the temperature rise of the working medium at the outlet side of the evaporator in the power generation device.

Claims (6)

An expander for expanding the gas-phase working medium,
A condenser for condensing the working medium expanded by said inflator,
A pump for pressurizing the working medium condensed by the condenser,
A heater for evaporating at least a portion of the working medium pressurized by the pump to heat of the heat source medium,
And cooling means for cooling the working medium in an overheated state at a predetermined temperature or higher in a range where the working medium is maintained at a saturated temperature or higher,
Wherein the cooling means has a cooling passage and a cooling valve provided in the cooling passage,
Wherein one end of the cooling passage is connected to a portion between the pump and the heater in a circulating flow path in which the condenser, the pump, the heater and the inflator are installed, and the other end is connected to the heater / RTI >
The operation of the pump is controlled so that the degree of superheat of the working medium falls within a predetermined range on the downstream side of the heater while the working medium is in an overheated state, When it is determined that the temperature of the medium exceeds the reference temperature, the cooling means opens the cooling valve to allow the liquid working medium flowing in the cooling passage to join the working medium in the overheated state of the circulating flow path And a cooling unit for cooling the working medium in the overheated state,
Generator. An expander for expanding the gas-phase working medium,
A condenser for condensing the working medium expanded by said inflator,
A pump for pressurizing the working medium condensed by the condenser,
A heater for evaporating at least a portion of the working medium pressurized by the pump to heat of the heat source medium,
And cooling means for cooling the working medium in an overheated state at a predetermined temperature or higher in a range where the working medium is maintained at a saturated temperature or higher,
Wherein the cooling means has a cooling heat exchanger, a cooling passage, and a cooling valve provided in the cooling passage,
Wherein one end of the cooling passage is connected to a portion between the pump and the heater in a circulating flow path in which the condenser, the pump, the heater and the inflator are installed, and the other end is connected to the space between the inflator and the condenser / RTI >
Wherein the cooling heat exchanger includes a working medium flow path which is arranged on the downstream side of the heater in the circulation flow path and which is connected to the circulation flow path,
The operation of the pump is controlled so that the degree of superheat of the working medium falls within a predetermined range on the downstream side of the heater while the working medium is in an overheated state, Wherein when the temperature of the medium is judged to be higher than the reference temperature, the cooling means opens the cooling valve so that the working medium classified in the cooling passage in the cooling heat exchanger and the working medium of the circulating flow passage And cooling the working medium in the overheated state by heat exchange indirectly,
Generator. 3. The method of claim 2,
The cooling means cooling the working medium in an overheated state by using the heat of vaporization,
Generator. An expander for expanding the gas-phase working medium,
A condenser for condensing the working medium expanded by the inflator by a cooling medium supplied from a cooling circuit,
A pump for pressurizing the working medium condensed by the condenser,
A heater for evaporating at least a portion of the working medium pressurized by the pump to heat of the heat source medium,
And cooling means for cooling the working medium in an overheated state at a predetermined temperature or higher in a range where the working medium is maintained at a saturated temperature or higher,
Wherein the cooling means has a cooling heat exchanger, a cooling passage, and a cooling valve provided in the cooling passage,
Wherein the cooling passage is connected to a portion on the downstream side of the condenser in the cooling circuit and the cooling medium flowing through the cooling passage is returned to the cooling circuit,
Wherein the cooling heat exchanger is disposed on a downstream side of the heater in the circulation flow passage, the working medium flow path connected to the circulation flow path and the cooling passage are provided in the cooling heat exchanger,
The operation of the pump is controlled so that the degree of superheat of the working medium falls within a predetermined range on the downstream side of the heater while the working medium is in an overheated state, Wherein when the temperature of the medium is judged to exceed the reference temperature, the cooling means opens the cooling valve to cool the working medium in the overheated state in the cooling heat exchanger,
Generator. An expander for expanding the gas-phase working medium,
A condenser for condensing the working medium expanded by said inflator,
A pump for pressurizing the working medium condensed by the condenser,
A heater for evaporating at least a portion of the working medium pressurized by the pump to heat of the heat source medium,
And a cooling means for cooling the working medium in an overheated state at a predetermined temperature or higher on the downstream side of the heater,
Wherein the cooling means includes a heat exchanger having a working medium flow path and a cooling flow path and disposed on a downstream side of the heater and a decompression means provided on a heating medium circuit connected to the cooling flow path,
Wherein the decompression means decompresses the heating medium so that the working medium is cooled in the heat exchanger when the working medium is in an overheated state and a predetermined temperature or more,
Generator. delete

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