JP2014025416A - Rankine cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rankine cycle device capable of reducing pressure loss caused by working fluid passing through an oxygen remover and of reducing an installation space.SOLUTION: A rankine cycle device 10 comprises: a vapor generator 11 generating vapor of refrigerant as a working fluid; an expander 12 expanding the vapor of the refrigerant; a condenser 13 condensing the refrigerant from the expander 12; a receiver tank 14 storing the refrigerant flowing out of the condenser 13; a pump 15 pumping the liquid refrigerant stored in the receiver tank 14 to the vapor generator 11; and a refrigerant flow passage 16 as a working fluid passage sequentially connecting the vapor generator 11, the expander 12, the condenser 13, the receiver tank 14, and the pump 15. The receiver tank 14 accommodates an oxygen remover 24 for removing oxygen contained in the refrigerant.

Description

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

A Rankine cycle apparatus is known as an apparatus 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 are provided.
Normally, the working fluid flowing through the working fluid flow path contains oil that lubricates the sliding portions of the expander and the pump.
Oxygen in the outside air enters the working fluid flow path from a joint portion of a pipe forming the working fluid flow path. 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 oil are deteriorated due to the oxidizing action by oxygen contained in the working fluid. For this reason, an oxygen removing agent may be disposed in the working fluid flow path, and oxygen contained in the working fluid may be removed by the oxygen removing agent.

  For example, in the waste heat recovery engine disclosed in Patent Document 1, the water purification means is disposed between the condenser outlet and the high-pressure pump inlet, and the water purification process can be performed by the water purification means. In the water purification means, the dissolved oxygen removal treatment of water can be performed.

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 water passing through the water purification means. Requires a container having a large cross-sectional area. In this case, in order to avoid pressure loss due to sudden expansion and contraction of the flow path cross-sectional area at the inlet / outlet 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.

  The present invention has been made in view of the above problems, and an object of the present invention is to reduce the pressure loss caused by the working fluid passing through the oxygen removing agent and to reduce the installation space. To provide cycle equipment.

  In order to solve the above-described problems, the invention according to claim 1 is a steam generator that generates steam of a working fluid, an expander that expands the steam of the working fluid, and the working fluid from the expander. A condenser for condensing steam; a receiver tank for storing the working fluid flowing out of the condenser; a pump for pumping the liquid working fluid stored in the receiver tank to the steam generator; and the steam In a Rankine cycle device comprising a generator, the expander, the condenser, the receiver tank, and a working fluid flow path for sequentially connecting the pump, oxygen contained in the working fluid is removed from the receiver tank. It is characterized by containing an oxygen scavenger.

According to the first aspect of the present invention, 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. Oxygen contained in the working fluid removes oxygen contained in the working fluid. 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 accommodating the oxygen scavenger in the receiver tank, the flow rate at which the working fluid passes 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.

  According to a second aspect of the present invention, in the Rankine cycle device according to the first aspect, the receiver tank has an outlet that flows out a liquid working fluid toward the pump, and the outlet is the outlet of the receiver tank. It is provided in the lower part.

  According to invention of Claim 2, since the outflow port is provided in the lower part of a receiver tank, compared with the case where an outflow port is provided in the upper part of a receiver tank, the flow path which can be covered with an oxygen removal agent The cross-sectional area can be expanded.

  The invention according to claim 3 is characterized in that, in the Rankine cycle apparatus according to claim 1 or 2, a desiccant is provided on the upstream side of the oxygen removing agent in the receiver tank.

  According to the invention described in claim 3, since the desiccant is provided on the upstream side of the oxygen removing agent in the receiver tank, the moisture contained in the working fluid is removed by the desiccant and then the oxygen removing agent is allowed to pass through. be able to. 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.

  Invention of Claim 4 is the Rankine-cycle apparatus as described in any one of Claims 1-3, The said oxygen removal agent is iron powder, It is characterized by the above-mentioned.

  According to the fourth aspect of the present invention, since the oxygen removing agent is iron powder, oxygen contained in the working fluid can be removed using an oxidation reaction between oxygen and iron powder.

  According to the present invention, it is possible to reduce the pressure loss due to the working fluid passing through the oxygen removing agent, and to reduce the installation space.

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.
In addition, the Rankine cycle apparatus 10 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 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, It circulates through the refrigerant flow path 16 in the order of the pump 15.
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 means for generating 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, and refrigerant vapor is generated.
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 between the refrigerant outlet of the steam generator 11 and the refrigerant inlet of the expander 12.

The expander 12 has a rotating body (not shown) driven by high-temperature and high-pressure steam. The high-temperature and high-pressure steam rotates the rotating body, so that the expander 12 generates rotational force on the output shaft. obtain.
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.

The condenser 13 is means for cooling and condensing 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.
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, and the refrigerant channel in the receiver tank 14 constitutes a part of the refrigerant channel 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 channel 16 of the present embodiment includes a fourth channel 25 that connects the refrigerant outlet of the receiver tank 14 and the refrigerant inlet of the pump 15. 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.
A refrigerant inlet 14D and a refrigerant outlet 14E are formed in the upper plate portion 14C. 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, and the end of the pipe 27 is in a state of being immersed in the liquid refrigerant stored in the receiver tank 14.
The inlet 14 </ b> D is connected to the condenser 13 through the third flow path 22. The outlet 14 </ b> 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 viewed as a part of the refrigerant flow path 16, the flow path cross-sectional area is set to be sufficiently larger than that of the other refrigerant flow paths 16. Moreover, it has the length of the flow path direction without the rapid expansion and contraction of the flow path cross-sectional area. 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 vertical length of the receiver tank 14.

A desiccant 23 and an oxygen remover 24 are accommodated in the space inside the receiver tank 14. The oxygen remover 24 is disposed near the middle in the vertical direction of the peripheral wall portion 14 </ b> A, and the oxygen remover 24 is dried above the oxygen remover 24. Agent 23 is arranged.
Although not shown, the desiccant 23 is disposed in the horizontal direction in a state of being filled in a wire mesh 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 arranged 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 in the horizontal direction with iron powder (Fe) interspersed on the surface of a structure having a honeycomb structure, for example, and is attached to the peripheral wall portion 14A.
The oxygen remover 24 is a remover for removing oxygen contained in the refrigerant, and specifically, an oxygen scavenger or an oxygen adsorbent. An oxygen scavenger removes oxygen by a chemical reaction (oxidation), and is, for example, iron powder (Fe). The oxygen adsorbent is one that removes oxygen by adsorption of oxygen that is not a chemical reaction, and is, for example, zeolite. In this embodiment, an oxygen scavenger is used as the oxygen scavenger 24.
At the center of the oxygen removing agent 24, a through hole 24A for inserting a pipe 27 disposed in the vertical direction is formed.
It should be noted that oxygen in the atmosphere enters from a joint portion or the like of the pipe that forms the refrigerant flow path 16, and the oxygen that has entered circulates in 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 flowing into the receiver tank 14 through the pipe 26 provided in the inlet 14 </ b> D is separated into liquid and gas while falling downward, and the liquid refrigerant is below the receiver tank 14. It is stored in. When the pump 15 is driven, the liquid refrigerant stored in the lower part of the receiver tank 14 is sucked in from the 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. At this time, the liquid refrigerant passes through the desiccant 23 and the oxygen removing agent 24 disposed in the receiver tank 14 in the direction from the upper side to the lower side, and moisture contained in the refrigerant is removed by the desiccant 23 to remove oxygen. The agent 24 removes oxygen contained in the refrigerant.

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 flow path 16 of the present embodiment includes a fifth flow path 28 that connects the refrigerant outlet of the pump 15 and the refrigerant inlet of the steam generator 11.
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 that has flowed 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 that has flowed 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 a liquid refrigerant and a 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 end of the pipe 27 and moves upward in the pipe 27. At this time, the liquid refrigerant passes through the desiccant 23 and the oxygen remover 24 disposed in the receiver tank 14, moisture contained in the refrigerant is removed by the desiccant 23, and contained in the refrigerant by the oxygen remover 24. Oxygen is removed.
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 cross-sectional area is set to be sufficiently larger than that of the other refrigerant flow paths 16. Moreover, it has the length of the flow path direction without the rapid 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, it has a cross-sectional area that is set sufficiently large compared to the other refrigerant flow paths 16, It has a length in the flow path direction that does not cause rapid expansion and contraction of the 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 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 via 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 is iron powder, oxygen contained in the refrigerant can be removed 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 this 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, explanation of common configurations is 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 the present embodiment, an outlet 14 </ b> E through which the liquid refrigerant flows toward the pump 15 is provided at the lower part of the receiver tank 14.
As shown in FIG. 4, a refrigerant inlet 14 </ b> D is formed in the upper plate portion 14 </ b> 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.
On the other hand, 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.
The inlet 14 </ b> D is connected to the condenser 13 through the third flow path 22. The outlet 14 </ b> E is connected to the pump 15 through the fourth flow path 25.

In the space inside the receiver tank 14, a desiccant 32 and an oxygen remover 33 are disposed. The oxygen remover 33 is disposed near the middle in the vertical direction of the peripheral wall portion 14 </ b> A, and the oxygen remover 33 is dried above the oxygen remover 33. Agent 32 is disposed.
Although not shown, the desiccant 32 is disposed in the horizontal direction 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 remover 33 is disposed.
Although not shown, the oxygen removing agent 33 is disposed in the horizontal direction in a state in which iron powder (Fe) is interspersed on the surface of a structure having a honeycomb structure, for example, 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 detailed configurations of the desiccant 32 and the oxygen scavenger 33 are the same as those in the first embodiment except that no through hole is formed at the center of each.

The pipe 31 connected to the outlet 14E is in a state of being inserted from below into the refrigerant stored in the receiver tank 14. 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.

Thus, in this embodiment, the outflow port 14E that flows out the liquid refrigerant toward the pump 15 is provided in the lower part of the receiver tank 14, and the pipe 31 connected to the outflow port 14E is provided in the receiver tank 14. It is in a state of being inserted from below into the refrigerant stored in the receiver tank 14 without being inserted through the oxygen removing agent 33 provided. 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.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the spirit of the invention. For example, the following modifications may be made.
In the above embodiment, the in-vehicle Rankine cycle device mounted on the vehicle is used, but the Rankine cycle device is not limited to in-vehicle use. For example, the Rankine cycle apparatus installed on the ground may be used.
In the above embodiment, the internal combustion engine is simply described as an engine, but the internal combustion engine may be a gasoline engine or a diesel engine.
In the first and second embodiments described above, the desiccant 23 or 32 is provided on the upstream side of the oxygen remover 24 or 33 in the receiver tank 14, but the oxygen remover 24 or in the receiver tank 14 or A desiccant 23 or 32 may be provided on the downstream side of 33.
In the first and second embodiments described above, the desiccant 23 or 32 is provided upstream of the oxygen remover 24 or 33 in the receiver tank 14, but the oxygen remover 24 and the desiccant 23 or A mixture of the oxygen remover 33 and the desiccant 32 may be formed as a single member, and this member may be disposed in the receiver tank 14. In this case, the installation space and the number of parts can be reduced.
In the above embodiment, the generator is cited as an example of the load. However, the load may be an engine, and is not particularly limited as long as the rotational force output from the expander can be used.
In the above embodiment, the scroll expander is used. However, the expander is not limited to the scroll expander, and may be of any type. For example, the expander may be a vane expander or a turbine expander.

10, 30 Rankine cycle apparatus 11 Steam generator 12 Expander 13 Condenser 14 Receiver tank 14D Inlet 14E Outlet 15 Pump 16 Refrigerant flow path 17 Engine 18 Exhaust path 19 First flow path 21 Second flow path 22 Third flow Paths 23, 32 Desiccant 24, 33 Oxygen remover 25 Fourth flow path 26 Pipe 27, 31 Pipe 28 Fifth flow path

Claims (4)

A steam generator for generating working fluid steam; and an expander for expanding the working fluid steam;
A condenser that condenses the vapor of the working fluid from the expander, a receiver tank that stores the working fluid that flows out of the condenser, and a vapor generation of the liquid working fluid that is stored in the receiver tank In a Rankine cycle apparatus comprising: a pump that pumps to a vessel; and a working fluid flow path that sequentially connects the steam generator, the expander, the condenser, the receiver tank, and the pump,
A Rankine cycle apparatus, wherein an oxygen removing agent for removing oxygen contained in the working fluid is accommodated in the receiver tank.   The Rankine cycle apparatus according to claim 1, wherein the receiver tank has an outlet through which liquid working fluid flows out toward the pump, and the outlet is provided at a lower portion of the receiver tank. .   The Rankine cycle apparatus according to claim 1, wherein a desiccant is provided upstream of the oxygen removing agent in the receiver tank.   The Rankine cycle apparatus according to any one of claims 1 to 3, wherein the oxygen scavenger is iron powder.

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