JP2022090556A - Binary power generator and its control method - Google Patents

Abstract

To suppress the flow-in of a lubricant existing in piping between a pump and an evaporator to the evaporator at a stop of an operation of a binary power generator.SOLUTION: A binary power generator 10 comprises a circulation flow passage 20 in which a pump 11, an evaporator 12, an expander 13 and a condenser 14 are connected to one another in this order, a lubricant is contained in a working fluid which circulates in the circulation flow passage 20, the circulation flow passage 20 has a first flow passage 21 for connecting the pump 11 and the evaporator 12, and the first flow passage 21 has an erecting flow passage 42 which is formed so as to erect from an upstream flow passage 41 existing at an upstream side, and includes a portion located above a flow-in port 32 of the evaporator 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to a binary power generator and a control method thereof.

A binary power generation device that generates power by the Rankine cycle using a heat source medium using relatively low-temperature heat energy such as factory exhaust heat and an operating medium using an organic medium having a low evaporation temperature is known. As this type of power generation device, Patent Document 1 discloses a binary power generation device provided with a circulation flow path for circulating an operating medium, and the circulation flow path includes a pump, an evaporator, a superheater, and the like. The expander and the condenser are arranged in this order. Since the working medium contains lubricating oil for the purpose of lubricating the expander, the lubricating oil also circulates in the circulation path along with the working medium. The binary power generator of Patent Document 1 is provided with a bypass flow path for returning the lubricating oil remaining in the superheater to the separator without being accompanied by the working medium, and the lubricating oil in the superheater is controlled by oil drainage control. It is designed to suppress the residual oil.

Japanese Unexamined Patent Publication No. 2014-47636

By the way, in this binary power generation device, the lubricating oil existing in the piping between the pump and the evaporator may flow into the evaporator when stopped. If the oil adheres to the heat transfer surface of the evaporator, the heat exchange performance may deteriorate.

Therefore, an object of the present invention is to prevent the lubricating oil existing in the piping between the pump and the evaporator from flowing into the evaporator when the binary power generation device is stopped.

The binary power generation device according to the present invention includes an evaporator that evaporates at least a part of the working medium by a heating medium, an expander that is driven by the expansion of the working medium evaporated by the evaporator, and a working medium that flows out of the expander. A condenser for condensing with a cooling medium, a pump for sending the working medium flowing out of the condenser to the evaporator, and the pump, the evaporator, the expander, and the condenser are connected in this order, and the pump is connected. A circulation flow path that circulates the working medium by driving and a lubricating oil that exists together with the working medium in the circulation flow path and lubricates the expander are provided, and the circulation flow path includes the pump and the evaporator. The first flow path is connected to the upstream flow path connected to the pump, and rises from the upstream flow path and is above the inlet of the working medium in the evaporator. It has an upright flow path including a portion located at.

In this embodiment, since the upright flow path is formed so as to rise from the upstream flow path on the first flow path connecting the pump and the evaporator, the pump is more than the upright flow path when the operation of the binary power generation device is stopped. The working medium on the side (upstream side) does not easily flow into the evaporator. As a result, the amount of residual lubricating oil in the evaporator can be reduced, and it is possible to prevent the lubricating oil from remaining in the evaporator and being heated and deteriorated. Further, since the upright flow path is formed so as to pass through a position higher than the inlet of the working medium in the evaporator, a part of the working medium evaporated by the evaporator when the operation of the binary power generation device is stopped is formed. It can be returned to the upright flow path and suppresses the accumulation of lubricating oil in the evaporator.

The binary power generator may include an oil return flow path connecting the bottom of the evaporator and the upstream flow path, and an oil return valve arranged on the oil return flow path, in which case the said The oil return flow path may be formed so as to extend downward from the bottom of the evaporator.

In this aspect, when the operation of the binary power generation device is stopped, the oil return valve is opened so that the lubricating oil remaining at the bottom of the evaporator is returned to the upstream flow path through the oil return flow path. As a result, the amount of residual lubricating oil in the evaporator when the operation is stopped can be further reduced.

The circulation flow path may include a second flow path connecting the condenser and the pump, in which case the binary power generator connects the upright flow path and the second flow path. A degassing flow path and a degassing valve arranged on the degassing flow path may be provided.

In this aspect, by opening the gas vent valve before restarting the operation of the binary power generation device, the gaseous working medium accumulated in the upright flow path is led out to the second flow path through the gas vent flow path. As a result, it is possible to prevent problems at the time of restarting operation such as gas biting caused by the gaseous operating medium accumulated in the upright flow path.

The upright flow path may include a horizontal portion extending horizontally in the upper portion thereof, in which case the degassing flow path may be connected to the horizontal portion.

In this aspect, by providing the horizontal portion at the upper part of the upright flow path, a part of the working medium evaporated by the evaporator flows into the horizontal portion of the upright flow path when the operation of the binary power generation device is stopped. As a result, the lubricating oil is suppressed from accumulating in the evaporator, and the gaseous working medium accumulating in the horizontal portion is efficiently returned to the second flow path through the degassing flow path connected to the horizontal portion. .. As a result, it is possible to prevent problems at the time of resumption of rolling such as gas biting caused by the gaseous operating medium accumulated in the upright flow path.

The present invention is a method for controlling a binary power generation device including a circulation flow path connecting a pump, an evaporator, an expander and a condenser in this order, and the binary power generation device exists in the circulation flow path together with an operating medium. A portion of the circulation flow path that contains lubricating oil that lubricates the expander and is a first flow path that connects the pump and the evaporator and is located above the inlet of the working medium of the evaporator. The control method includes the first flow path having an upright flow path including the pump and the second flow path connecting the condenser and the pump, and the control method is a working medium from the evaporator after stopping the pump. At the same time, the oil return operation for returning the lubricating oil to the first flow path is started, and the degassing operation for returning the gaseous operating medium from the upright flow path to the second flow path is started, and the oil return operation is started. This includes restarting the pump after terminating the operation and terminating the degassing operation.

In this embodiment, the lubricating oil remaining in the bottom of the evaporator is returned to the first flow path by performing the oil return operation after the pump is stopped. As a result, the amount of residual lubricating oil in the evaporator when the operation of the binary power generation device is stopped is reduced. Further, by performing the degassing operation after the pump is stopped, the gaseous working medium accumulated in the upright flow path is returned to the second flow path through the degassing flow path. This makes it possible to prevent problems at the time of restarting operation such as gas biting caused by the gaseous operating medium accumulated in the upright flow path.

As described above, according to the present invention, it is possible to prevent the lubricating oil existing in the piping between the pump and the evaporator from flowing into the evaporator when the binary power generation device is stopped.

It is a figure which shows schematic structure of the binary power generation apparatus shown in 1st Embodiment. It is a figure which shows schematic structure of the binary power generation apparatus shown in 2nd Embodiment. It is a flowchart which shows the process of the control method of 2nd Embodiment. It is a figure which shows schematic structure of the binary power generation apparatus shown in 3rd Embodiment. It is a flowchart which shows the process of the control method of 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate.

<First Embodiment>
As shown in FIG. 1, the binary power generation device 10 according to the first embodiment is a power generation device installed in a ship, and is a binary power generation using a Rankine cycle using exhaust gas discharged from an internal combustion engine of the ship as a heat source. It is a power generation device that performs. The binary power generation device 10 includes a circulation flow path 20 including a closed circuit for circulating the working medium, and an organic medium having a boiling point lower than the boiling point of water is used as the working fluid.

The circulation flow path 20 is provided with a pump 11, an evaporator 12, an expander 13, and a condenser 14 in this order. A superheater may be further provided between the evaporator 12 and the expander 13 in the circulation flow path 20.

The circulation flow path 20 connects the first flow path 21 that connects the pump 11 and the evaporator 12, the second flow path 22 that connects the pump 11 and the condenser 14, and the evaporator 12 and the expander 13. It includes a third flow path 23 and a fourth flow path 24 that connects the expander 13 and the condenser 14.

One end of the first flow path 21 is connected to the discharge port 31 of the pump 11, and the other end is connected to the inflow port 32 of the evaporator 12. The pump 11 may be located higher than the evaporator 12 or may be located lower than the evaporator 12. The discharge port 31 of the pump 11 may be arranged at a position higher than the inlet 32 of the evaporator 12, or may be arranged at a position lower than the inlet 32. One end of the second flow path 22 is connected to the outlet of the condenser 14, and the other end is connected to the suction port of the pump 11.

The pump 11 pressurizes the liquid working medium to a predetermined pressure and generates a driving force for circulating the working medium in the circulation flow path 20.

The evaporator 12 is composed of a heat exchanger having a heating medium flow path 33 through which the heating medium flows and an operating medium flow path 34 through which the working medium flows, and operates by exchanging heat between the heating medium and the liquid working medium. Evaporate the medium. As the heat exchanger constituting the evaporator 12, for example, a plate type heat exchanger, a multi-tube heat exchanger, or the like is used.

In the evaporator 12, the inlet 32 of the working medium is arranged at the lower part of the evaporator 12. That is, the first flow path 21 is connected to the lower part of the working medium flow path 34. The heating medium supplied to the heating medium flow path 33 is scavenging supercharged air discharged from the internal combustion engine of a ship or exhaust gas from an engine, but may be other than this, for example, exhaust gas discharged from a factory or the like, high temperature. It may be air, steam, or the like.

The expander 13 is composed of a rotating machine that converts the expansion energy of the evaporated working medium into mechanical kinetic energy. As the rotary machine constituting the expander 13, for example, a screw type turbine provided with a pair of screw rotors, a centrifugal type turbine, or the like is used. A generator 15 is connected to the expander 13, and the generator 15 is configured to generate power by rotationally driving the rotating machine constituting the expander 13.

The condenser 14 is composed of a heat exchanger having a cooling medium flow path 35 through which the cooling medium flows and an operating medium flow path 36 through which the working medium flows, and operates by exchanging heat between the cooling medium and the vapor-like working medium. It is configured to condense the medium.

Normally, when the pump 11 is in operation, the working medium circulates in the circulation flow path 20 by the operation of the pump 11. When the operation of the pump 11 is stopped, the circulation of the working medium is stopped, so that the circulation different from the normal circulation of the working medium is likely to occur between the evaporator 12 and the first flow path 21. An upright flow path 42 is provided in the first flow path 21 in order to suppress a flow different from the normal circulation of the working medium when the operation of the pump 11 is stopped. Hereinafter, the configuration of the upright flow path 42 will be described.

The first flow path 21 includes an upstream flow path 41 connected to the discharge port 31 of the pump 11, a downstream flow path 43 connected to the inflow port 32 of the evaporator 12, an upstream flow path 41 and a downstream flow path. It includes an upright flow path 42 connected to 43. The downstream flow path 43 may be short, and the downstream flow path 43 may be omitted.

The upright flow path 42 includes a rising portion 51 connected to the upstream flow path 41, a rising portion 53 connected to the downstream flow path 43, and a horizontal portion 52.

The rising portion 51 extends upward from the end portion (downstream side end portion) of the upstream flow path 41 in a vertical direction or an oblique direction. The upper side here means the upper side in the direction of gravity. That is, the upright flow path 42 is formed so as to rise from the upstream flow path 41. Therefore, when the operation of the pump 11 is stopped, the working medium left on the upstream side of the upright flow path 42 is unlikely to flow into the evaporator 12.

The rising portion 53 extends upward from the end portion (upstream side end portion) of the downstream flow path 43 in a vertical direction or an oblique direction. That is, the upright flow path 42 includes a portion located above the position of the inlet 32 of the evaporator 12. Therefore, when the operation of the pump 11 is stopped, the working medium vaporized by the evaporator 12 tends to flow upward through the falling portion 53. When the downstream flow path 43 is omitted, the end portion (downstream side end portion) of the rising portion 53 of the upright flow path 42 is connected to the inflow port 32 of the evaporator 12.

The horizontal portion 52 is the top portion of the upright flow path 42, and the horizontal portion 52 extends in the horizontal direction and extends in the horizontal direction to the end portion (downstream side end portion) of the rising portion 51 and the end portion (upstream side end portion) of the raising portion 53. Department) and connect.

The upstream flow path 41, the upright flow path 42, and the downstream flow path 43 are each composed of piping parts such as straight pipes and pipe joints, but are not limited thereto. For example, the upstream flow path 41, the upright flow path 42, and the downstream flow path 43 may be formed by one pipe member.

During operation of the binary power generation device 10 configured as described above, the working medium circulates in the circulation flow path 20 by the drive of the pump 11. The working medium contains lubricating oil that lubricates the expander 13, and circulates in the circulation flow path 20 along with the working medium.

The liquid working medium discharged from the pump 11 flows into the working medium flow path 34 of the evaporator 12 through the first flow path 21, and evaporates by heat exchange with the heating medium. At this time, the working medium is evaporated in a state where a certain amount of liquid working medium is accumulated in the working medium flow path 34. The evaporated working medium flows into the expander 13 through the third flow path 23 and expands in the expander 13. The expansion energy of the working medium is converted into kinetic energy by the expander 13, and the generator 15 generates electricity by the converted kinetic energy.

The working medium expanded by the expander 13 and having a reduced pressure flows into the working medium flow path 36 of the condenser 14 through the fourth flow path 24, and is condensed by heat exchange with the cooling medium. The condensed liquid working medium flows into the pump 11 through the second flow path 22.

In the binary power generation device 10 operating as described above, the heating medium may be continuously supplied to the evaporator 12 even after the circulation of the working medium is stopped due to the stop of the operation of the pump 11. In the binary power generation device 10 installed on the ship, the exhaust gas from the internal combustion engine continues to be discharged during the navigation of the ship, so that the heating medium is always supplied to the evaporator 12 regardless of the operating state of the pump 11. Will be done. In this case, even though the circulation of the working medium is stopped, the heating by the heating medium is continued in the evaporator 12, so that the working medium remaining in the evaporator 12 evaporates and becomes the working medium. The contained lubricating oil tends to remain in the evaporator 12. Similarly, even when the binary power generation device 10 is used for a purpose other than a ship, the supply of the heating medium to the evaporator 12 may be continued after the circulation of the working medium is stopped.

However, in the binary power generation device 10, since the upright flow path 42 is provided, it is difficult for the working medium left on the upstream side of the upright flow path 42 to flow into the evaporator 12 when the circulation of the working medium is stopped. As a result, the residual lubricating oil in the evaporator 12 is suppressed. As a result, it is possible to suppress the deterioration of the heat exchange performance of the evaporator 12 caused by the lubricating oil remaining in the evaporator 12 adhering to the heat transfer surface of the working medium flow path 34, and the lubricating oil remains in the evaporator 12. It is possible to prevent the lubricating oil from being heated and deteriorated by the heating medium. Moreover, since the working medium evaporated by the evaporator 12 flows upward through the falling portion 53, the evaporated working medium can be returned to the upright flow path 42. As a result, the residual lubricating oil in the evaporator 12 is further suppressed.

<Second Embodiment>
The binary power generation device 10 according to the second embodiment will be described with reference to FIG. Here, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The binary power generation device 10 of the second embodiment is different from the first embodiment in that it includes an oil return flow path 61, an oil return valve 62, and a control unit 67.

The binary power generation device 10 has an oil return flow path 61 for returning the lubricating oil remaining at the bottom of the working medium flow path 34 of the evaporator 12 to the upstream flow path 41, and an oil for opening and closing the oil return flow path 61. It is equipped with a return valve 62. The oil return flow path 61 connects the bottom of the working medium flow path 34 of the evaporator 12 and the upstream flow path 41, and at least a part of the oil return flow path 61 is downward from the bottom of the working medium flow path 34. It is formed so as to extend vertically or diagonally toward. The oil return flow path 61 is located below the upright flow path 42 (lower side in the direction of gravity).

The oil return valve 62 is electrically connected to the control unit 67, and the opening / closing of the oil return valve 62 is controlled by the control unit 67. The control unit 67 may be omitted, in which case the oil return valve 62 is manually opened and closed.

A control method including an oil return operation and a degassing operation when the circulation of the working medium is stopped in the binary power generation device 10 according to the second embodiment will be described with reference to FIG.

During normal operation of the binary power generation device 10, the working medium circulates in the circulation flow path 20 due to the operation of the pump 11. At this time, the oil return valve 62 is closed. During the normal operation of the binary power generation device 10, the operator performs a predetermined operation for stopping the operation of the binary power generation device 10, so that the oil return operation is started.

When the predetermined operation is performed, the operation of the pump 11 is first stopped (step S1). As a result, the circulation of the working medium in the circulation flow path 20 is stopped.

Next, the oil return valve 62 is opened by the control unit 67, so that the oil return operation is started (step S2). As a result, the lubricating oil remaining at the bottom of the working medium flow path 34 flows into the oil return flow path 61 and is returned to the upstream flow path 41 through the oil return flow path 61. Then, after a certain period of time has passed from the start of the oil return operation, the control unit 67 closes the oil return valve 62 (step S3). As a result, the oil return operation is completed. The timing at which the oil return valve 62 is closed is not limited to this, and for example, the oil return valve 62 may remain open from the operation stop to the restart of the pump 11, or may remain at the bottom of the operating medium flow path 34. It may be closed by feedback control by detecting the liquid level of the accumulated lubricating oil.

After that, the operator performs a predetermined operation for restarting the normal operation of the binary power generation device 10, so that the pump 11 is started (step S6) and the normal operation of the binary power generation device 10 is restarted.

When the pump 11 is stopped and the circulation of the working medium is stopped, the oil return valve 62 is opened by the control unit 67, so that the lubricating oil remaining at the bottom of the working medium flow path 34 is removed from the oil return flow path. It flows into 61 and is further returned to the upstream flow path 41 through the oil return flow path 61 (oil return operation). It is not necessary that all the lubricating oil is returned to the upstream flow path 41, and a part of the lubricating oil may remain in the oil return flow path 61. As a result, the residual lubricating oil in the evaporator 12 when the circulation of the working medium is stopped can be suppressed, and the lubricating oil remaining in the evaporator 12 can be prevented from being heated and deteriorated.

Although the description of other configurations, actions and effects will be omitted, the description of the first embodiment can be incorporated into the second embodiment.

<Third Embodiment>
The binary power generation device 10 according to the third embodiment will be described with reference to FIG. Here, the same components as those in the second embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The binary power generation device 10 of the third embodiment is different from the second embodiment in that it includes a degassing flow path 63, a degassing valve 64, and a control unit 67.

The binary power generation device 10 opens and closes a degassing flow path 63 for returning the gaseous working medium accumulated in the horizontal portion 52 of the upright flow path 42 to the second flow path 22 and a degassing flow path 63. It includes a degassing valve 64, and a control unit 67 for controlling the opening and closing of the oil return valve 62 and the degassing valve 64.

The degassing flow path 63 connects the horizontal portion 52 of the upright flow path 42 and the second flow path 22, and at least a part of the degassing flow path 63 is in the vertical direction facing upward from the horizontal portion 52 or. It is formed so as to extend in an oblique direction. The degassing flow path 63 is not limited to the one connected to the horizontal portion 52, and if the gaseous operating medium of the upright flow path 42 can be returned to the second flow path 22, another device other than the horizontal portion 52 can be used. It may be connected to the site of. Further, the degassing flow path 63 is not limited to the one connected to the second flow path 22, and may be connected to the condenser 14.

By opening the gas vent valve 64 when the circulation of the working medium is stopped, the gaseous working medium accumulated in the upright flow path 42 flows into the gas venting flow path 63, and further flows through the gas venting flow path 63 to the second flow path. Returned to 22 (gas venting operation). The gaseous working medium returned to the second flow path 22 is cooled and liquefied by the liquid working medium flowing through the second flow path 22, and is pumped together with the liquid working medium flowing through the second flow path 22. It is sent to 11.

The oil return valve 62 and the degassing valve 64 are electrically connected to the control unit 67, and the control unit 67 controls the opening and closing of the oil return valve 62 and the degassing valve 64. The control unit 67 may be omitted, in which case the oil return valve 62 and the degassing valve 64 are manually opened and closed.

Here, in the binary power generation device 10 according to the third embodiment, a control method including an oil return operation and a degassing operation when the circulation of the working medium is stopped will be described with reference to FIG.

During normal operation of the binary power generation device 10, the working medium circulates in the circulation flow path 20 due to the operation of the pump 11. At this time, the oil return valve 62 and the degassing valve 64 are closed. During the normal operation of the binary power generation device 10, the operator performs a predetermined operation for stopping the operation of the binary power generation device 10, whereby the oil return operation and the degassing operation are started.

When the predetermined operation is performed, the operation of the pump 11 is first stopped (step S1). As a result, the circulation of the working medium in the circulation flow path 20 is stopped.

Next, the oil return valve 62 is opened by the control unit 67, so that the oil return operation is started (step S2). As a result, the lubricating oil remaining at the bottom of the working medium flow path 34 flows into the oil return flow path 61 and is returned to the upstream flow path 41 through the oil return flow path 61. Then, after a certain period of time has passed from the start of the oil return operation, the control unit 67 closes the oil return valve 62 (step S3). As a result, the oil return operation is completed. The timing at which the oil return valve 62 is closed is not limited to this, and for example, the oil return valve 62 may remain open from the operation stop of the pump 11 to the restart, or may remain at the bottom of the operating medium flow path 34. It may be closed by feedback control by detecting the liquid level of the accumulated lubricating oil.

Next, the degassing valve 64 is opened by the control unit 67, so that the degassing operation is started (step S4). As a result, the gaseous working medium stagnant in the upright flow path 42 flows into the degassing flow path 63 and is returned to the second flow path 22 through the degassing flow path 63. Then, after a certain period of time has elapsed from the start of the degassing operation, the control unit 67 closes the degassing valve 64 (step S5). As a result, the degassing operation is completed. The timing at which the degassing valve 64 is closed is not limited to this, and for example, the degassing valve 64 may remain open from the operation stop of the pump 11 to the restart.

After that, the operator performs a predetermined operation for restarting the normal operation of the binary power generation device 10, so that the pump 11 is started (step S6) and the normal operation of the binary power generation device 10 is restarted.

By providing the gas vent flow path 63 and the gas vent valve 64 in the binary power generation device 10, the gaseous working medium accumulated in the upright flow path 42 is led out to the gas vent flow path 63, and further, the second flow path 22 Returned to. This makes it possible to prevent problems at the time of restarting operation such as gas biting caused by the gaseous operating medium accumulated in the upright flow path 42.

By the control method including the oil return operation and the degassing operation related to the binary power generation device 10, the residual lubricating oil at the bottom of the evaporator 12 is suppressed when the circulation of the working medium is stopped, and the gas biting when the pump 11 is restarted is suppressed. Problems are prevented.

Although the description of other configurations, actions and effects will be omitted, the description of the second embodiment can be incorporated into the third embodiment.

It should be understood that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

For example, in the above embodiment, the horizontal portion 52 may be omitted and the top of the upright flow path 42 may be formed at an acute angle.

In the second embodiment, the oil return valve 62 may be omitted. During normal operation of the binary power generator 10, most of the working medium flows through the first flow path 21 toward the evaporator 12 due to the operation of the pump 11 (the working medium may slightly flow through the oil return flow path 61). ). When the operation of the pump 11 is stopped, the lubricating oil remaining at the bottom of the working medium flow path 34 flows into the oil return flow path 61 located below the upright flow path 42 and is returned to the upstream flow path 41. Is done. It is not necessary that all the lubricating oil is returned to the upstream flow path 41, and a part of the lubricating oil may remain in the oil return flow path 61. As a result, the residual lubricating oil in the evaporator 12 when the circulation of the working medium is stopped can be suppressed, and the lubricating oil remaining in the evaporator 12 can be prevented from being heated and deteriorated. Also in the third embodiment, the oil return valve 62 may be omitted.

10 Binary power generator 11 Pump 12 Evaporator 13 Inflator 14 Condenser 20 Circulation flow path 21 First flow path 22 Second flow path 41 Upstream flow path 42 Standing flow path 52 Horizontal part 61 Oil drain flow path 62 Oil drain valve 63 Degassing flow path 64 Degassing valve 67 Control unit

Claims (5)

An evaporator that evaporates at least a part of the working medium with a heating medium,
An expander driven by the expansion of the working medium evaporated by the evaporator,
A condenser that condenses the working medium flowing out of the expander with a cooling medium,
A pump that sends the working medium flowing out of the condenser to the evaporator,
A circulation flow path in which the pump, the evaporator, the expander, and the condenser are connected in this order and the working medium is circulated by driving the pump.
Lubricating oil that exists together with the working medium in the circulation flow path and lubricates the expander.
Equipped with
The circulation flow path has a first flow path connecting the pump and the evaporator.
The first flow path includes an upstream flow path connected to the pump and an upright flow path that includes a portion that rises from the upstream flow path and is located above the inlet of the working medium in the evaporator.
Binary power generator with. The binary power generator according to claim 1 is
An oil return flow path connecting the bottom of the evaporator and the upstream flow path,
Further equipped with an oil return valve arranged on the oil return flow path,
The oil return flow path is a binary power generator formed so as to extend downward from the bottom of the evaporator. In the binary power generator according to claim 1 or 2.
The circulation flow path includes a second flow path connecting the condenser and the pump.
The binary power generator is
A degassing flow path connecting the upright flow path and the second flow path,
The degassing valve arranged on the degassing flow path and
A binary power generator equipped with. In the binary power generator according to claim 3,
The upright flow path includes a horizontal portion extending horizontally above it.
The degassing flow path is a binary power generator connected to the horizontal portion. It is a control method of a binary power generator equipped with a circulation flow path connecting a pump, an evaporator, an expander and a condenser in this order.
The binary power generator contains lubricating oil that is present in the circulation flow path with the working medium and lubricates the expander.
The circulation flow path is a first flow path connecting the pump and the evaporator and has an upright flow path including a portion located above the inlet of the working medium of the evaporator. Includes a path and a second flow path connecting the condenser and the pump.
The control method is
After stopping the pump, the oil return operation of returning the lubricating oil from the evaporator to the first flow path is started, and the gaseous working medium is transferred from the upright flow path to the second flow path. Starting the degassing operation to return and
This includes restarting the pump after finishing the oil return operation and finishing the degassing operation.
How to control a binary power generator.

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