WO2014017272A1

WO2014017272A1 - Rankine cycle device

Info

Publication number: WO2014017272A1
Application number: PCT/JP2013/068435
Authority: WO
Inventors: 英文森; 井口　雅夫; 榎島　史修; 文彦石黒
Original assignee: 株式会社豊田自動織機
Priority date: 2012-07-27
Filing date: 2013-07-04
Publication date: 2014-01-30
Also published as: JP2014025416A

Abstract

A Rankine cycle device (10) is provided with: a vapor generator (11) for generating the vapor of operating fluid; an expander (12) for expanding the vapor of the operating fluid; a condenser (13) for condensing the vapor of the operating fluid, the vapor flowing from the expander; a receiver tank (14) for holding the operating fluid flowing out of the condenser; a pump (15) for sending under pressure the operating fluid in a liquid state to the vapor generator, the operating fluid in a liquid state being held in the receiver tank; operating fluid flow passages (19, 21, 22, 25, 28) for sequentially connecting the vapor generator, the expander, the condenser, the receiver tank, and the pump; and an oxygen elimination agent (24) received in the receiver tank and eliminating oxygen contained in the operating fluid.

Description

Rankine cycle equipment

The present invention relates to a Rankine cycle apparatus, and more particularly, to a Rankine cycle apparatus provided with an oxygen remover that removes oxygen from a working fluid.

A Rankine cycle device is known as a device that effectively uses waste heat.

The Rankine cycle device includes a steam generator that generates a working fluid steam, an expander that expands the working fluid steam, a condenser that condenses the working fluid from the expander, and a working fluid that flows out of the condenser. A pump for pumping to the generator, and a working fluid flow path for sequentially connecting the steam generator, the expander, the condenser and the pump.

Normally, the working fluid flowing through the working fluid flow path contains oil that lubricates the sliding parts of the expander and the pump.

Oxygen in the outside air enters the working fluid channel from the joint of the piping that forms the working fluid channel. For this reason, the working fluid contains oxygen, and the working fluid containing oxygen circulates in the working fluid flow path. In this case, there is a possibility that the working fluid and the oil are deteriorated due to an oxidizing action by oxygen contained in the working fluid. For this reason, in order to remove oxygen contained in the working fluid, an oxygen removing agent may be disposed in the working fluid flow path.

For example, in the waste heat recovery engine disclosed in Patent Document 1, water purification means for purifying water is disposed between the condenser outlet and the high-pressure pump inlet. Moreover, the water purification means can perform the dissolved oxygen removal process of water.

JP 2003-214102 A

However, in the waste heat recovery engine disclosed in Patent Document 1, in order to prevent cavitation on the suction side of the high-pressure pump, it is necessary to reduce the pressure loss by reducing the flow rate of the water passing through the water purification means. For this purpose, a container having a large channel cross-sectional area is required. In this case, in order to avoid pressure loss due to sudden expansion and contraction of the channel cross-sectional area at the entrance and exit of the container, the container needs to have a certain length with respect to the flow direction of the working fluid. As a result, there is a problem that the capacity of the container is increased and the installation space of the container is increased.

An object of the present invention is to provide a Rankine cycle apparatus capable of reducing pressure loss due to the working fluid passing through the oxygen removing agent and reducing the installation space.

In order to achieve the above object, according to one aspect of the present invention, a steam generator that generates steam of a working fluid, an expander that expands the steam of the working fluid, and the steam of the working fluid from the expander. A condenser for condensing, a receiver tank for storing the working fluid flowing out from the condenser, a pump for pumping the liquid working fluid stored in the receiver tank to the steam generator, and the steam generator And a working fluid flow path for sequentially connecting the expander, the condenser, the receiver tank, and the pump, and an oxygen removing agent that is accommodated in the receiver tank and removes oxygen contained in the working fluid.

According to the above configuration, when the pump is operated, the working fluid circulates in the working fluid flow path in the order of the steam generator, the expander, the condenser, the receiver tank, and the pump, and is accommodated in the receiver tank in the receiver tank. Oxygen contained in the working fluid is removed by the oxygen removing agent. The receiver tank has a function of performing gas-liquid separation of the refrigerant condensed in the condenser and storing the separated liquid refrigerant, and both the cross-sectional area of the flow path and the length of the working fluid in the flow direction are large. It is a container.

Therefore, by storing the oxygen scavenger in the receiver tank, the flow rate of the working fluid passing through the oxygen scavenger can be lowered to reduce the pressure loss. Moreover, it is possible to reduce the installation space without requiring a special container for installing the oxygen scavenger.

It is preferable that the receiver tank has an outlet for flowing a liquid working fluid toward the pump, and the outlet is provided at a lower portion of the receiver tank.

According to the above configuration, since the outlet is provided at the lower part of the receiver tank, the cross-sectional area of the channel that can be covered with the oxygen removing agent is expanded compared to the case where the outlet is provided at the upper part of the receiver tank. Is possible.

The above aspect preferably further includes a desiccant provided upstream of the oxygen scavenger in the receiver tank.

According to the above configuration, since the desiccant is provided on the upstream side of the oxygen remover in the receiver tank, the oxygen remover can be passed after the moisture contained in the working fluid is removed by the desiccant. Therefore, since the water is removed from the working fluid when passing through the oxygen removing agent, oxygen contained in the working fluid can be efficiently removed.

The oxygen scavenger preferably contains iron powder.

According to this configuration, since the oxygen removing agent contains iron powder, oxygen contained in the working fluid can be removed using an oxidation reaction between oxygen and iron powder.

It is a lineblock diagram of a Rankine cycle device concerning a 1st embodiment. It is a principal part expanded sectional view of FIG. It is a lineblock diagram of a Rankine cycle device concerning a 2nd embodiment. It is a principal part expanded sectional view of FIG.

(First embodiment)
The Rankine cycle device according to the first embodiment will be described below with reference to the drawings. The Rankine cycle device of the present embodiment is a vehicle-mounted Rankine cycle device mounted on a vehicle.

As shown in FIG. 1, the Rankine cycle apparatus 10 includes a steam generator 11, an expander 12, a condenser 13, a receiver tank 14, and a pump 15. The Rankine cycle apparatus 10 includes a refrigerant flow path 16 that sequentially connects a steam generator 11, an expander 12, a condenser 13, a receiver tank 14, and a pump 15.

The refrigerant flow path 16 corresponds to a working fluid flow path, and the refrigerant as the working fluid flowing through the refrigerant flow path 16 is activated by the operation of the pump 15, and the steam generator 11, the expander 12, the condenser 13, the receiver tank 14, The refrigerant flows in the order of the pump 15 through the refrigerant flow path 16.

In the Rankine cycle device 10 of the present embodiment, oil is contained in the refrigerant, and the oil contained in the refrigerant flows through the refrigerant flow path 16 together with the refrigerant. The oil contained in the refrigerant fulfills functions such as lubrication, sealing, and cooling in the sliding portions of the expander 12 and the pump 15.

The steam generator 11 is a device that generates refrigerant vapor using exhaust gas discharged from the engine 17 through the exhaust passage 18 as a heat source (not shown). The refrigerant flow path passing through the interior of the steam generator 11 constitutes a part of the refrigerant flow path 16. In the steam generator 11, the refrigerant is heated by heat exchange between the refrigerant in the refrigerant flow path 16 and the exhaust gas passing through the exhaust passage 18, thereby generating refrigerant vapor. The exhaust gas that has passed through the steam generator 11 is discharged into the atmosphere through the exhaust passage 18. The refrigerant flow path 16 of the present embodiment includes a first flow path 19 that connects the refrigerant outlet of the steam generator 11 and the refrigerant inlet of the expander 12 to each other.

The expander 12 has a rotating body (not shown) driven by high-temperature and high-pressure steam. When the high-temperature and high-pressure steam rotates the rotating body, the expander 12 obtains a rotational force on the output shaft. The refrigerant flow path passing through the inside of the expander 12 constitutes a part of the refrigerant flow path 16. The expander 12 of the present embodiment is a scroll expander, and the rotating body is a movable scroll that can turn with respect to the fixed scroll. The expander 12 converts the pressure energy of the refrigerant vapor into mechanical energy by decompressing and expanding the refrigerant vapor in a substantially adiabatic state. The output shaft of the expander 12 is connected to a load 20 (for example, a generator), and the rotational force obtained in the expander 12 is output to the load 20. The refrigerant channel 16 of the present embodiment includes a second channel 21 that connects the refrigerant outlet of the expander 12 and the refrigerant inlet of the condenser 13 to each other.

The condenser 13 is a device that cools and condenses the vapor refrigerant flowing out of the expander 12, and a flow path (not shown) through which the refrigerant passes is provided inside the condenser 13. The refrigerant flow path in the condenser 13 constitutes a part of the refrigerant flow path 16. The refrigerant flow path 16 of the present embodiment includes a third flow path 22 that connects the refrigerant outlet of the condenser 13 and the refrigerant inlet of the receiver tank 14 to each other. At the refrigerant outlet of the condenser 13, the refrigerant condensed through the condenser 13 flows out to the receiver tank 14 on the downstream side.

The receiver tank 14 is a tank that stores the refrigerant that has passed through the condenser 13. The refrigerant flow path in the receiver tank 14 constitutes a part of the refrigerant flow path 16. In the receiver tank 14, gas-liquid separation of the condensed refrigerant after passing through the condenser 13 is performed, and the liquid refrigerant (liquid refrigerant) is temporarily stored in the receiver tank 14.

The refrigerant flow path 16 of the present embodiment includes a fourth flow path 25 that connects the refrigerant outlet of the receiver tank 14 and the refrigerant inlet of the pump 15 to each other. The liquid refrigerant stored in the receiver tank 14 is sucked into the pump 15 through the fourth flow path 25.

As shown in FIG. 2, the receiver tank 14 has a cylindrical shape, and includes a cylindrical peripheral wall portion 14A, a disk-shaped bottom plate portion 14B, and a disk-shaped upper plate portion 14C. An internal space surrounded by the peripheral wall portion 14A, the bottom plate portion 14B, and the upper plate portion 14C functions as a storage space for storing the refrigerant and a flow path through which the refrigerant passes, and constitutes a part of the refrigerant flow path 16.

The upper plate portion 14C is formed with a refrigerant inlet 14D and a refrigerant outlet 14E. In the receiver tank 14, a pipe 26 connected to the inlet 14D and a pipe 27 connected to the outlet 14E are provided. The pipe 26 is provided in the upper part in the receiver tank 14. The pipe 27 extends downward in the receiver tank 14. The lower end of the pipe 27 is immersed in the liquid refrigerant stored in the receiver tank 14.

The inlet 14 D is connected to the condenser 13 via the third flow path 22. The outlet 14 E is connected to the pump 15 through the fourth flow path 25.

The space inside the receiver tank 14 functions as a part of the refrigerant flow path 16. When the space inside the receiver tank 14 is considered as a part of the refrigerant flow path 16, the flow path in the receiver tank 14 has a sufficiently large flow path cross-sectional area as compared with the other refrigerant flow paths 16. Further, the flow path in the receiver tank 14 has a length in the flow path direction in which there is no sudden expansion and contraction of the flow path cross-sectional area. That is, the channel cross-sectional area of the receiver tank 14 is substantially constant. The flow path cross-sectional area corresponds to the size when the cross-sectional area of the pipe 27 is subtracted from the cross-sectional area when the receiver tank 14 is cut in the horizontal direction in FIG. 2 corresponds to the length of the receiver tank 14 in the vertical direction, that is, in the vertical direction.

A desiccant 23 and an oxygen remover 24 are accommodated in the space inside the receiver tank 14. An oxygen removing agent 24 is disposed near the middle in the vertical direction of the peripheral wall portion 14A. A desiccant 23 is disposed above the oxygen scavenger 24, that is, upstream. Although not shown, the desiccant 23 is horizontally disposed in a state of being filled in a wire net-like case, and is attached to the peripheral wall portion 14A. At the center of the desiccant 23, a through hole 23A for inserting a pipe 27 disposed in the vertical direction is formed. The desiccant 23 removes moisture in the refrigerant. Below the desiccant 23, an oxygen remover 24 is disposed.

Although not shown, the oxygen scavenger 24 is disposed horizontally, for example, with iron powder (Fe) interspersed on the surface of a structure having a honeycomb structure, and is attached to the peripheral wall portion 14A.

The oxygen scavenger 24 is a scavenger for removing oxygen contained in the refrigerant, and is specifically an oxygen scavenger or an oxygen adsorbent. An oxygen scavenger removes oxygen by a chemical reaction (oxidation) and includes, for example, iron powder (Fe). The oxygen adsorbent is one that removes oxygen by adsorption of oxygen that is not a chemical reaction, and includes, for example, zeolite. In the present embodiment, an oxygen scavenger is used as the oxygen scavenger 24.

In the center of the oxygen removing agent 24, a through hole 24A is formed for inserting a pipe 27 disposed so as to extend in the vertical direction.

In addition, when oxygen in the atmosphere enters from the joint portion of the pipe forming the refrigerant flow path 16, the oxygen that has entered circulates through the refrigerant flow path 16 in a state of being contained in the refrigerant. In this case, the refrigerant and the oil may be deteriorated by oxygen contained in the refrigerant. The oxygen remover 24 is for removing oxygen contained in the refrigerant.

As shown in FIG. 2, the refrigerant that has flowed into the receiver tank 14 through the pipe 26 provided at the inlet 14D is separated into liquid and gas while falling downward. The liquid refrigerant is stored below the receiver tank 14. When the pump 15 is driven, the liquid refrigerant stored in the lower portion of the receiver tank 14 is sucked from the lower end of the pipe 27, moves upward in the pipe 27, and is sucked into the pump 15 through the fourth flow path 25. Is done. When the liquid refrigerant falls downward in the receiver tank 14, the liquid refrigerant passes through the desiccant 23 and the oxygen removing agent 24 arranged in the receiver tank 14 from the upper side to the lower side, and is absorbed in the refrigerant by the desiccant 23. The moisture contained in is removed. Thus, oxygen contained in the refrigerant is removed by the oxygen remover 24.

As shown in FIG. 1, the pump 15 sucks and discharges the refrigerant flowing out from the receiver tank 14 and pumps it to the steam generator 11. In this embodiment, an electric gear pump is employed.

The flow path through which the refrigerant passes inside the pump 15 corresponds to a part of the refrigerant flow path 16. The refrigerant channel 16 of this embodiment includes a fifth channel 28 that connects the refrigerant outlet of the pump 15 and the refrigerant inlet of the steam generator 11 to each other.

By driving the pump 15, the refrigerant can circulate through the refrigerant flow path 16 in the order of the steam generator 11, the expander 12, the condenser 13, the receiver tank 14, and the pump 15.

Next, the operation of the Rankine cycle device 10 of the present embodiment will be described.

During operation of the engine 17, exhaust gas passes from the engine 17 through the exhaust passage 18 and through the steam generator 11. When the pump 15 is driven, the refrigerant flows in the order of the steam generator 11, the expander 12, the condenser 13, the receiver tank 14, and the pump 15 to circulate through the refrigerant flow path 16. In the steam generator 11, the refrigerant becomes high-temperature and high-pressure steam by heat exchange with the exhaust gas. The refrigerant vapor flows out to the expander 12 through the first flow path 19.

The steam flowing into the expander 12 is decompressed and expanded in a substantially adiabatic state in the expander 12, the pressure energy of the steam is converted into mechanical energy, and the rotational force of the expander 12 is output to the load 20.

The low-pressure refrigerant vapor flowing out of the expander 12 flows into the condenser 13 through the second flow path 21. In the condenser 13, the refrigerant vapor is cooled and condensed by heat exchange with air. The condensed refrigerant flows into the receiver tank 14 through the third flow path 22. In the receiver tank 14, the condensed refrigerant is separated into a liquid refrigerant and a gaseous refrigerant, and the liquid refrigerant is temporarily stored in the receiver tank 14.

As shown in FIG. 2, the condensed refrigerant flowing out from the pipe 26 is separated into liquid refrigerant and gaseous refrigerant while falling downward, and the liquid refrigerant is stored below the receiver tank 14. By driving the pump 15, the liquid refrigerant stored below the receiver tank 14 is sucked from the lower end of the pipe 27 and moves upward in the pipe 27. When the liquid refrigerant falls downward in the receiver tank 14, the liquid refrigerant passes through the desiccant 23 and the oxygen removing agent 24 disposed in the receiver tank 14. At this time, moisture contained in the refrigerant is removed by the desiccant 23, and oxygen contained in the refrigerant is removed by the oxygen remover 24.

The space inside the receiver tank 14 functions as a part of the refrigerant flow path 16. When the space inside the receiver tank 14 is viewed as a part of the refrigerant flow path 16, the flow path in the receiver tank 14 has a sufficiently large flow path cross-sectional area as compared with the other refrigerant flow paths 16. Further, the flow path in the receiver tank 14 has a length in the flow path direction in which there is no sudden expansion and contraction of the flow path cross-sectional area. When the liquid refrigerant passes through the desiccant 23 and the oxygen removing agent 24 by driving the pump 15, the flow rate of the liquid refrigerant is low enough to reduce the pressure loss. Therefore, by installing the oxygen remover 24 in the receiver tank 14, the flow rate of the liquid refrigerant passing through the oxygen remover 24 can be reduced to reduce the pressure loss.

In addition to the receiver tank 14, a special container is not required for installing the oxygen removing agent 24, and the receiver tank 14 can be used as it is as a container for the oxygen removing agent 24, so that installation space can be reduced. is there.

The liquid refrigerant stored in the receiver tank 14 flows out to the pump 15 through the pipe 27 and the fourth flow path 25. In addition, since the liquid refrigerant sucked into the pump 15 through the pipe 27 and the fourth flow path 25 is a saturated liquid, generation of cavitation in the pump 15 can be prevented.

The pump 15 sucks and discharges the liquid refrigerant flowing out from the receiver tank 14 and pumps it to the steam generator 11. In the steam generator 11, the flowing liquid refrigerant becomes high-temperature and high-pressure steam by heat exchange with the exhaust gas. At this time, since the inflowing liquid refrigerant does not contain oxygen, it can be prevented from being deteriorated by the oxidizing action of the refrigerant and oil by oxygen.

The Rankine cycle device 10 according to the first embodiment has the following operational effects.

(1) When the space inside the receiver tank 14 is viewed as a part of the refrigerant flow path 16, the flow path in the receiver tank 14 has a sufficiently large flow path cross-sectional area as compared to the other refrigerant flow paths 16. ing. Further, the flow path in the receiver tank 14 has a length in the flow path direction in which there is no sudden expansion and contraction of the flow path cross-sectional area. That is, the channel cross-sectional area of the receiver tank 14 is substantially constant. When the liquid refrigerant passes through the desiccant 23 and the oxygen removing agent 24 by driving the pump 15, the flow rate of the liquid refrigerant is low enough to reduce the pressure loss. Therefore, by installing the oxygen removing agent 24 in the receiver tank 14, the flow rate of the liquid refrigerant passing through the oxygen removing agent 24 can be reduced to reduce the pressure loss, which is caused by the pressure loss on the suction side of the pump 15. Generation of cavitation can be prevented.

(2) Since the liquid refrigerant sucked into the pump 15 through the pipe 27 and the fourth flow path 25 is a saturated liquid, the occurrence of cavitation on the suction side of the pump 15 can be prevented.

(3) A separate container is not required to install the oxygen remover 24 separately from the receiver tank 14, and the receiver tank 14 can be used as it is as a container for the oxygen remover 24, so that the installation space can be reduced. It is.

(4) In the steam generator 11, the inflowing liquid refrigerant becomes high-temperature and high-pressure steam by heat exchange with the exhaust gas. At this time, since the inflowing liquid refrigerant does not contain oxygen, it can be prevented from being deteriorated by the oxidizing action of the refrigerant and oil by oxygen.

(5) Since the desiccant 23 is provided on the upstream side of the oxygen remover 24 in the receiver tank 14, the oxygen remover 24 is allowed to pass after the moisture contained in the liquid refrigerant is removed by the desiccant 23. it can. Therefore, since the liquid refrigerant at the time of passing through the oxygen remover 24 has moisture removed, oxygen contained in the liquid refrigerant can be efficiently removed.

(6) Since the oxygen scavenger (iron powder) or the oxygen adsorbent (zeolite) can be used as the oxygen scavenger 24, the degree of freedom in selecting the oxygen scavenger 24 can be expanded.

(7) Since the oxygen removing agent 24 contains iron powder, it is possible to remove oxygen contained in the refrigerant using an oxidation reaction between oxygen and iron powder.

(Second Embodiment)
Next, the Rankine cycle apparatus 30 according to the second embodiment will be described with reference to FIGS. 3 and 4. In the present embodiment, the position of the outlet 14E in the first embodiment is changed, and other configurations are common. Therefore, here, for convenience of explanation, some of the reference numerals used in the previous explanation are used in common, explanations of common configurations are omitted, and only the changed parts are explained.

As shown in FIG. 3, the Rankine cycle apparatus 30 includes a steam generator 11, an expander 12, a condenser 13, a receiver tank 14, and a pump 15. The Rankine cycle apparatus 30 includes a refrigerant flow path 16 that sequentially connects the steam generator 11, the expander 12, the condenser 13, the receiver tank 14, and the pump 15. The refrigerant as the working fluid flowing through the refrigerant flow path 16 flows through the refrigerant flow path 16 in the order of the steam generator 11, the expander 12, the condenser 13, the receiver tank 14, and the pump 15 by the operation of the pump 15. .

In this embodiment, an outlet 14E through which a liquid refrigerant flows out toward the pump 15 is provided at the lower part of the receiver tank 14, that is, at the bottom.

As shown in FIG. 4, a refrigerant inlet 14 D is formed in the upper plate portion 14 C of the receiver tank 14. In the receiver tank 14, a pipe 26 connected to the inflow port 14D is attached downward as in the first embodiment.

A refrigerant outlet 14E is formed in the bottom plate portion 14B of the receiver tank 14. In the receiver tank 14, a pipe 31 connected to the outlet 14E is attached upward.

A desiccant 32 and an oxygen remover 33 are disposed in the space inside the receiver tank 14, and the oxygen remover 33 is disposed near the middle in the vertical direction of the peripheral wall portion 14A. A desiccant 32 is disposed on the upstream side.

Although not shown, the desiccant 32 is horizontally disposed in a state of being filled in a wire net-like case, and is attached to the peripheral wall portion 14A. A through hole is not formed at the center of the desiccant 32.

Below the desiccant 32, an oxygen scavenger 33 is disposed. Although not shown, the oxygen scavenger 33 is disposed horizontally, for example, with iron powder (Fe) scattered on the surface of a structure having a honeycomb structure, and is attached to the peripheral wall portion 14A. A through hole is not formed in the center of the oxygen removing agent 33. The configurations of the desiccant 32 and the oxygen removing agent 33 are the same as those in the first embodiment except that the through hole is not formed at the center of each.

The pipe 31 connected to the outlet 14 E is inserted into the refrigerant stored in the receiver tank 14 from below. The pipe 31 does not pass through the desiccant 32 and the oxygen remover 33 provided in the receiver tank 14.

Other configurations are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, in the present embodiment, the outlet 14 E through which the liquid refrigerant flows toward the pump 15 is provided in the lower portion, that is, the bottom portion of the receiver tank 14. The pipe 31 connected to the outlet 14E is inserted from below into the refrigerant stored in the receiver tank 14 without passing through the oxygen removing agent 33 provided in the receiver tank 14. Therefore, the cross-sectional area of the flow path that can be covered with the oxygen removing agent 33 can be expanded as compared with the first embodiment, and the removal efficiency of oxygen contained in the refrigerant can be improved.

Other effects are equivalent to (1) to (7) in the first embodiment.

Note that the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the present invention may be modified and embodied as follows.

In the above embodiments,

Rankine cycle devices

10 and 30 are embodied as in-vehicle Rankine cycle devices mounted on a vehicle, but the Rankine cycle devices are not limited to in-vehicle use.

Rankine cycle apparatuses

10 and 30 may be Rankine cycle apparatuses installed on the ground, for example.

In the above embodiments, the internal combustion engine is simply described as the engine 17, but the internal combustion engine may be a gasoline engine or a diesel engine.

In each of the above embodiments, the

desiccant

23 or 32 is provided on the upstream side of the

oxygen removing agent

24 or 33 in the receiver tank 14, but on the downstream side of the

oxygen removing agent

24 or 33 in the receiver tank 14. A

desiccant

23 or 32 may be provided.

In each of the above embodiments, the

desiccant

23 or 32 is provided on the upstream side of the

oxygen removing agent

24 or 33 in the receiver tank 14. Instead of this, even if one member in which the oxygen remover 24 and the desiccant 23 are mixed or one member in which the oxygen remover 33 and the desiccant 32 are mixed is disposed in the receiver tank 14. good. In this case, the installation space and the number of parts can be reduced.

In the above embodiments, the generator is cited as an example of the load 20, but the load 20 may be an engine, and is not particularly limited as long as the rotational force output from the expander 12 can be used.

In each of the above embodiments, the expander 12 is a scroll type expander. However, the expander 12 is not limited to the scroll type and can be of any type, for example, a vane type expander or a turbine type expander. May be.

Claims

Rankine cycle device,
A steam generator for generating working fluid steam;
An expander for expanding the vapor of the working fluid;
A condenser for condensing the vapor of the working fluid from the expander;
A receiver tank for storing the working fluid flowing out from the condenser;
A pump for pumping the liquid working fluid stored in the receiver tank to the steam generator;
A working fluid flow path for sequentially connecting the steam generator, the expander, the condenser, the receiver tank, and the pump;
A Rankine cycle device comprising an oxygen removing agent that is housed in the receiver tank and removes oxygen contained in the working fluid.
The Rankine cycle device according to claim 1, wherein the receiver tank has an outlet for flowing a liquid working fluid toward the pump, and the outlet is provided at a lower portion of the receiver tank.
The Rankine cycle apparatus according to claim 1 or 2, further comprising a desiccant provided upstream of the oxygen scavenger in the receiver tank.
The Rankine cycle device according to any one of claims 1 to 3, wherein the oxygen scavenger contains iron powder.