JP6511297B2 - Power generator - Google Patents

Description

  The present invention relates to a power generation device using a working fluid.

  Generally, a small-scale power generation facility configured to generate electricity by connecting a small fluid machine such as a small steam turbine or the like that obtains rotational power from steam energy and a generator by a connecting shaft is known as an example of a power generation device. ing.

  Conventionally, in such a power generation facility, when the generator is disconnected from the system load, the valves on the inlet side and the outlet side of the small fluid machine are closed and the valve between the outlet side valve and the small fluid machine is closed. By introducing high pressure air from the passage to reduce the pressure difference between the inlet side and the outlet side of the small-sized fluid machine, the small-sized fluid machine and the generator are prevented from failing due to over-rotation. Anti-rotational braking devices have been proposed.

  The over-rotation prevention braking device is configured by providing an air pressure source in which high-pressure compressed air is stored separately from steam energy for rotating a small fluid machine in a power generation facility (see, for example, Patent Document 1).

JP, 2008-101489, A

  However, since the conventional power generation facility is provided with an air pressure source in which high-pressure compressed air is stored separately from the power generation facility to configure the over-rotation prevention braking device, the device becomes complicated. This results in design constraints, which increase the size and cost of the device.

  Further, the compressed air from the over-rotation prevention braking device must be instantaneously supplied at a pressure close to the pressure acting on the over-rotation, which makes the control bothersome and difficult.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a power generating device capable of releasing working fluid without failure in an emergency requiring an emergency stop of the expander with a simple configuration. The purpose is.

The power generation device according to the present invention for solving the above-mentioned problems is configured such that the working fluid flowing in the supply path is supplied to the expander and the expander is driven, whereby power is output from the output shaft connected to the expander. A power generating device for taking out, which is provided between the supply path and the discharge path of the expander, a bypass path bypassing from the supply path to the discharge path, and downstream of the junction of the bypass path and the discharge path on the side, provided a first shut-off valve, the bypass path, the bypass valve is provided, upstream of the branch point of the supply path and the bypass path, the second shut-off valve is provided, excitation of the expander When the current is shut off, a control unit is provided to control to close the first shutoff valve and open the bypass valve, and then close the second shutoff valve.

  In the above power generator, the first shut-off valve is normally open and closed when activated, and the bypass valve is normally closed and opened when activated. It may be.

  In the above power generation device, a third shutoff valve may be provided downstream of a branch point between the supply path and the bypass path in the supply path.

  In the above power generation device, the second shutoff valve may be provided on the upstream side of the branch point between the supply path and the bypass path in the supply path, and the third shutoff valve may be provided on the downstream side. Good.

  The above power generation device may have a control unit that controls the first shut-off valve, the second shut-off valve, and the bypass valve to open while closing the third shut-off valve at startup.

  In the above power generation device, a three-way valve may be provided at a branch point between the supply path and the bypass path in the supply path.

  In the above power generator, the working fluid may be water vapor.

  The power supply target of the power generation apparatus may be an induction generator.

  In the power generating device, the expander may be a scroll expander directly coupled to the output shaft.

According to the present invention, a bypass path is provided between the supply path and the discharge path of the expander, which bypasses the supply path to the discharge path, and the downstream side of the junction between the discharge path and the bypass path in the discharge path. to the first shut-off valve is provided, the bypass path, the bypass valve is provided, on the upstream side of the branch point of the supply path and the bypass path, the second shut-off valve is provided, the exciting current of the expander is shut off In this case, there is provided a control unit for closing the first shutoff valve and opening the bypass valve and then closing the second shutoff valve. Since the discharge path on the more upstream side is bypassed by the bypass path, the pressure of the working fluid same as that of the supply path is applied, and the pressure on the supply side and the discharge side across the expander becomes equal. The machine is over It is possible to prevent that the rolling, by closing the second shut-off valve, can also be prevented that the supply pressure of the water vapor into the temporary expander increases.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the whole structure at the time of using the motive power generation device which concerns on this invention for generator drive. It is the schematic of the whole structure at the time of using the motive power generation device which concerns on other embodiment of this invention for generator drive. It is the schematic of the whole structure at the time of using the motive power generation device which concerns on other embodiment of this invention for generator drive. It is the schematic of the whole structure at the time of using the motive power generation device which concerns on other embodiment of this invention for generator drive. It is the schematic of the whole structure at the time of using the motive power generation device which concerns on other embodiment of this invention for generator drive.

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

  FIG. 1 shows an outline of the overall configuration when the power generation device 1 according to the present invention is used for driving a generator.

  The power generation device 1 is configured to drive the induction generator 3 connected to the scroll expander 2 by supplying the steam flowing through the supply path 11 to the scroll expander 2 and driving the scroll expander 2. Between the supply path 11 and the discharge path 12 of the scroll expander 2 is provided a bypass path 13 that bypasses the supply path 11 to the discharge path 12, and the discharge path 12 and the bypass path in the discharge path 12 A first shutoff valve 41 is provided on the downstream side of the junction point B with 13 and a bypass valve 42 is provided on the bypass path 13.

  The supply path 11 is connected to a supply port of the scroll expander 2 from a supply source of water vapor, and the scroll expander 2 is driven by the water vapor supplied from the upstream side of the supply path 11. A metering valve 40 is provided in the supply path 11, and the supply amount of water vapor serving as a driving source of the scroll expander 2 is adjusted by controlling the opening / closing degree of the metering valve 40 by the control unit 10. Ru. At this time, the control unit 10 uses the pressure sensor P1 provided on the inlet side (upstream side) of the metering valve 40 in the supply path 11 and the pressure sensor P2 provided on the inlet side (upstream side) of the scroll expander 2 The opening and closing control of the metering valve 40 is performed while managing. Further, on the most upstream side of the supply path 11, a strainer 11a for filtering foreign matter in the water vapor flowing through the supply path 11 is provided. Further, a second shutoff valve 43 is provided on the downstream side of the metering valve 40 and on the upstream side of a branch point A with the bypass passage 13. The second shutoff valve 43 is normally in the open state, and when it is necessary to shut off the water vapor to the scroll expander 2, the control unit 10 controls the supply to be in the closed state. The water vapor flowing through the passage 11 can be shut off.

  One end of the discharge path 12 is connected to the discharge port of the scroll expander 2. The other end of the discharge path 12 is connected to a first shutoff valve 41 provided on the downstream side of the junction B with the bypass path 13. The first shutoff valve 41 is normally in the open state, and when it is necessary to prevent the excessive rotation of the scroll expander 2, the control unit 10 controls the first shut off valve 41 so that the first shutoff valve 41 is closed. The same steam pressure as that applied to the supply path 11 is applied to the discharge path 12 flowing the steam flowing through the path 13 to the discharge path 12 and reaching the scroll expander 2 on the upstream side from the first shutoff valve 41 The pressure is increased to thereby prevent over rotation of the scroll expander 2.

  Further, on the downstream side of the first shutoff valve 41 of the discharge path 12, a condensate tank 6 is connected via a condenser 5. As a result, the steam after passing through the scroll expander 2 is condensed and liquefied by heat exchange with the secondary cooling water in the condenser 5, and is then stored in the condensate tank 6. A temperature sensor T 1 is provided at the outlet of the condenser 5 in the discharge path 12, and a temperature sensor T 2 is provided at the outlet of the condenser 5 in the secondary cooling water path 51. The control unit 10 measures the temperature of condensed water passing through the discharge path 12 from the temperature sensor T1, and measures the temperature of secondary cooling water after heat exchange passing through the secondary cooling water path 51 from the temperature sensor T2, The degree of heat exchange between the water vapor and the secondary cooling water by the condenser 5 can be controlled.

  One end of the bypass path 13 is connected between the downstream side of the second shutoff valve 43 provided in the supply path 11 and the supply port of the scroll expander 2, and the other end is an outlet of the scroll expander 2. Between the downstream side of the valve and the upstream side of the first shutoff valve 41. Thus, the bypass path 13 is provided to bypass between the supply path 11 and the discharge path 12. Further, a bypass valve 42 is provided in the bypass path 13. The bypass valve 42 is normally closed, and is opened by the control of the control unit 10 when it is desired to discharge the water vapor in the supply passage 11 to the discharge passage 12 without supplying the water to the scroll expander 2. The water vapor flowing through the supply passage 11 can be discharged to the discharge passage 12.

  The condensed water stored in the condensate tank 6 is supplied to a water supply tank (not shown) by a pump 7 provided in the drainage path 14. A pressure sensor P4 and a liquid level sensor L are provided in the condensate tank 6, and the control unit 10 checks the degree of condensation by the pressure sensor P4 and condenses in the condensate tank 6 by the liquid level sensor L. It is made to be able to check the amount of water.

  The scroll expander 2 is configured to rotate at a rated rotational speed set at the scroll expander 2, for example, 1800 to 3600 rpm, and can be directly connected to the induction generator 3.

  The induction generator 3 generates slip when the rotational torque due to the rotation of the scroll expander 2 directly connected to the induction generator 3 becomes larger than the load torque of the rotating magnetic field generated by the supply of the excitation current. It will function as The induction generator 3 functions as an electric motor when the load torque becomes smaller than the rotational torque. The induction generator 3 is provided with a sensor R for detecting the number of revolutions, and the control unit 10 causes the rotation torque by the scroll expander 2 to be larger than the load torque of the induction generator 3 to function as a generator. It is made to control. In addition, when the electric power supplied to the electric system 8 becomes excessive, the electric power can be adjusted by functioning as an electric motor. The induction generator 3 is configured to be able to connect and disconnect to the electric system 8 by the electromagnetic switch 81.

  The power generation device 1 configured in this manner adjusts the water vapor supplied from the supply path 11 by means of the metering valve 40 and supplies the water vapor to the scroll expander 2, and the induction power generation directly connected to the scroll expander 2 Power is generated by operating the machine 3 as a generator. The electric power obtained by the power generation is supplied to the electric system 8 through the electromagnetic switch 81.

  The steam supplied to the scroll expander 2 and driven by the scroll expander 2 is converted into condensed water by the condenser 5 and stored in the condensate tank 6. The stored condensed water is supplied from a drainage path 14 connected to the condensate tank 6 to a water supply tank (not shown) by a pump 7 and hot water is used.

  Thereafter, the above operation is repeated to continue power generation.

  In the operating state of the power generation device 1, load torque of a rotating magnetic field generated by the supply of the excitation current is generated in the scroll expander 2. Therefore, from such an operating condition, if the power is suddenly cut off or a system disconnection occurs to shut off the excitation current, the scroll expander 2 runs out of load torque and runs out, and is rated. Since there is a concern that the rotation will be excessive due to exceeding the rotation speed, an emergency stop of the scroll expander 2 is required.

  Therefore, the control unit 10 of the power generation device 1 according to the present invention closes the first shutoff valve 41 in the event of an emergency such that the excitation current is interrupted due to a power failure, system disconnection, or the like. The bypass valve 42 is to be opened.

  That is, by closing the first shut-off valve 41 and opening the bypass valve 42, the steam supplied to the scroll expander 2 is released from the bypass passage 13 provided with the bypass valve 42 to the discharge passage 12, and The same steam pressure as the steam pressure applied to the supply path 11 is applied to the discharge path 12 from the first shut-off valve 41 to the scroll expander 2 on the upstream side to achieve pressure equalization and thereby over rotation of the scroll expander 2 It will be possible to prevent. Alternatively, the first shutoff valve 41 may be closed and the second shutoff valve 43 may be closed simultaneously with the opening of the bypass valve 42. This makes it possible to completely stop the supply of water vapor to the pressure equalized passage on the downstream side of the second shut-off valve 43 and on the upstream side of the first shut-off valve 41. It is possible to prevent the steam pressure from becoming excessively high by the steam that is being supplied, and to protect the scroll expander 2 without being exposed to high pressure.

  Further, since the second shutoff valve 43 is provided on the upstream side of the branch point A in the supply path 11, even if the second shutoff valve 43 is shut off, the second shutoff valve 43 is downstream of the branch point A on the supply path 11. The water vapor escapes to the discharge path 12 through the bypass path 13. Therefore, it is possible to prevent the supply pressure of water vapor to the scroll expander 2 from being temporarily increased by closing the second shutoff valve 43.

  When the first shutoff valve 41 is closed and the second shutoff valve 43 is closed before the operation to open the bypass valve 42, the pressure of the water vapor accumulated in the supply passage 11 downstream of the second shutoff valve 43 is There is a concern that it may rise momentarily to cause further runaway of the scroll expander 2. Therefore, the control unit 10 is configured to control to close the first shutoff valve 41 and close the second shutoff valve 43 simultaneously with or slightly behind the operation of opening the bypass valve 42.

  By performing control in this manner, it is possible to prevent a failure due to excessive rotation of the scroll expander 2 even in the case of an emergency such as a sudden power failure or a system disconnection.

  In the power generation device 1 shown in FIG. 1, the supply amount of water vapor is adjusted by controlling the opening / closing degree of the metering valve 40, and the supply of water vapor is shut off by closing the second shutoff valve 43. If it is configured to be able to supply water vapor to the supply path 11 at a stable predetermined water vapor pressure from the water vapor supply source, as shown in FIG. The power generation device 1a may be configured without the metering valve 40 and the second shutoff valve 43.

  FIG. 3 shows a power generation device 1b according to another embodiment of the present invention. In FIG. 3, the same members as those of the power generation device 1a shown in FIG.

  The power generation device 1b is located downstream of the branch point A between the supply path 11 and the bypass path 13 in the supply path 11 of the power generation device 1a shown in FIG. 2 described above, that is, the branch point A and the scroll expansion. A metering valve 40 and a third shutoff valve 44 are provided in the supply path 11 between the supply port of the machine 2 and the machine 2. The metering valve 40 is provided upstream of the third shutoff valve 44.

  Although the strainer 11a is provided on the upstream side of the supply path 11, in the supply path 11 on the downstream side of the strainer 11a, foreign matter such as rust or contamination may be generated inside the pipe by stopping the power generation device 1b. is there. In addition, it is feared that the condensed water accumulated in the pipe together with such foreign matter will be a water hammer by the high pressure steam supplied to the scroll expander 2 at the time of start-up and break the scroll expander 2. .

  Therefore, the control unit 10 of the power generation device 1b according to the present invention is controlled as follows at the time of start-up.

  That is, the control unit 10 of the power generation device 1b closes the third shutoff valve 44 at startup and opens the bypass valve 42 so as not to supply water vapor to the scroll expander 2, and for a while, water vapor from the bypass passage 13 It flows to the discharge path 12. Then, after the steam is sufficiently flowed to the bypass path 13, the bypass valve 42 is closed, the third shutoff valve 44 is opened, and the supply of the steam to the scroll expander 2 is started.

  As a result, in the power generation device 1b, foreign matter and condensed water can be flowed to the discharge path 12 by the water vapor, and foreign matter can be prevented from entering the scroll expander 2. Can be prevented from breaking.

  Further, the control unit 10 of the power generation device 1b according to the present invention closes the first shutoff valve 41 in the event of an emergency such that the excitation current is interrupted due to a power failure or system disconnection, By opening the bypass valve 42, excessive rotation of the scroll expander 2 can be prevented as in the above-described power generation device 1. Further, the control unit 10 may control to close the first shutoff valve 41 and to close the third shutoff valve 44 simultaneously with the opening of the bypass valve 42 or thereafter. Thereby, the supply of water vapor to the scroll expander 2 is shut off, and the water vapor supplied to the scroll expander 2 is released from the bypass passage 13 provided with the bypass valve 42 to the discharge passage 12, The steam pressure of the discharge path 12 from the shutoff valve 41 to the scroll expander 2 on the upstream side, and the steam pressure of the shutoff supply path 11 from the downstream side of the third shutoff valve 44 to the supply port of the scroll expander 2 The pressure equalization of the scroll expander 2 can be performed quickly to prevent over rotation of the scroll expander 2.

  Further, since the third shutoff valve 44 is provided on the downstream side of the branch point A in the supply passage 11, the third shut-off valve 44 is on the upstream side of the supply port of the scroll expander 2 when the supply of water vapor is completely stopped. It is possible to shorten the length of the path where the water vapor is shut off. That is, in the case of the power generation device 1 shown in FIG. 1, the long path from the position of the second shutoff valve 43 upstream of the branch point A to the supply port of the scroll expander 2 is interrupted. In the case of 1b, only a short path from the position of the third shutoff valve 44 located downstream of the branch point A to the supply port of the scroll expander 2 is blocked, so it is difficult to generate condensed water. Furthermore, at the time of start of the power generation device 1b, the control unit 10 of the power generation device 1b closes the third shutoff valve 44 and opens the first shutoff valve 41 and the bypass valve 42 to supply water vapor to the scroll expander 2. Instead, steam is allowed to flow from the bypass passage 13 to the discharge passage 12 for a while. Then, after the steam is sufficiently flowed to the bypass path 13, the bypass valve 42 is closed, the third shutoff valve 44 is opened, and the supply of the steam to the scroll expander 2 is started.

  As a result, in the power generation device 1b, foreign matter and condensed water are flowed to the discharge path 12 by the steam, so even if the third shutoff valve 44 is opened and the supply of steam to the scroll expander 2 is resumed, the foreign matter is While being able to prevent entering into the scroll expander 2, it is possible to prevent the condensed water from breaking down the scroll expander 2 as a water hammer. Therefore, there is no need to provide a steam trap for discharging the condensed water and the drain at the time of startup, and the apparatus can be simplified.

  As shown in FIG. 4, the power generation device 1c shown in FIG. 1 is provided with both the first shutoff valve 41 and the third shutoff valve 44 of the power generation device 1b shown in FIG. May be configured. Although the metering valve 40 is provided on the downstream side of the branch point A in FIG. 4, it may be provided on the upstream side.

  The control unit 10 of the power generation device 1c closes the first shutoff valve 41 and the bypass valve 42 of the bypass path 13 in the event of an emergency such that the excitation current is interrupted due to a power failure or system disconnection. By opening the same, it is possible to prevent excessive rotation of the scroll expander 2 as in the above-described power generator 1.

  In addition, the control unit 10 may control to close the first shutoff valve 41 and to close the second shutoff valve 43 simultaneously with the opening of the bypass valve 42 or thereafter. This makes it possible to completely stop the supply of water vapor to the pressure equalized passage on the downstream side of the second shut-off valve 43 and on the upstream side of the first shut-off valve 41. It is possible to prevent the steam pressure from becoming excessively high by the steam that is being supplied, and to protect the scroll expander 2 without being exposed to high pressure.

  Furthermore, the control unit 10 may control to close the first shutoff valve 41 and simultaneously close the third shutoff valve 44 at the same time as opening the bypass valve 42. Thereby, the supply of water vapor to the scroll expander 2 is shut off, and the water vapor supplied to the scroll expander 2 is released from the bypass passage 13 provided with the bypass valve 42 to the discharge passage 12, The steam pressure of the discharge path 12 from the shutoff valve 41 to the scroll expander 2 on the upstream side, and the steam pressure of the shutoff supply path 11 from the downstream side of the third shutoff valve 44 to the supply port of the scroll expander 2 The pressure equalization of the scroll expander 2 can be performed quickly to prevent over rotation of the scroll expander 2.

  At the time of startup of the power generation device 1c, the control unit 10 of the power generation device 1c closes the third shutoff valve 44 and opens the first shutoff valve 41, the second shutoff valve 43 and the bypass valve 42. The water vapor is supplied from the bypass passage 13 to the discharge passage 12 for a while. Then, after the steam is sufficiently flowed to the bypass path 13, the bypass valve 42 is closed, the third shutoff valve 44 is opened, and the supply of the steam to the scroll expander 2 is started.

  As a result, in the power generation device 1c, foreign matter and condensed water are flowed to the discharge path 12 by the water vapor. Therefore, even if the third shutoff valve 44 is opened and the supply of water vapor to the scroll expander 2 is resumed, the foreign matter is While being able to prevent entering into the scroll expander 2, it is possible to prevent the condensed water from breaking down the scroll expander 2 as a water hammer. Therefore, there is no need to provide a steam trap for discharging the condensed water and the drain at the time of startup, and the apparatus can be simplified.

  FIG. 5 shows a power generation device 1d according to another embodiment of the present invention. In FIG. 5, the same members as those of the power generating device 1 shown in the power generating device 1 shown in FIG.

  The power generating device 1d has a three-way valve 45 at a branch point A between the supply path 11 and the bypass path 13 instead of the bypass valve 42 and the second shutoff valve 43 provided in the power generating device 1 shown in FIG. It is provided and configured.

  The three-way valve 45 is controlled by the control unit 10 as follows.

  That is, the control unit 10 of the power generation device 1d according to the present invention communicates from the metering valve 40 to the scroll expander 2 in an emergency such that the excitation current is interrupted due to a power failure or system disconnection. The first three-way valve 45 is switched to the bypass path 13 and the first shutoff valve 41 is closed.

  That is, by closing the first shutoff valve 41 and switching the three-way valve 45 to the bypass path 13, the steam supplied to the scroll expander 2 is released from the bypass path 13 to the discharge path 12 and the first shutoff The same steam pressure as the steam pressure applied to the supply path 11 is applied to the discharge path 12 from the valve 41 to the scroll expander 2 on the upstream side to achieve pressure equalization, thereby preventing over-rotation of the scroll expander 2 It becomes. Further, the switching of the three-way valve 45 shuts off the supply of water vapor to the scroll expander 2, and the water vapor supplied to the scroll expander 2 is released from the bypass passage 13 to the discharge passage 12, and the first shutoff valve Pressure equalization of the water vapor pressure of the discharge path 12 from 41 to the scroll expander 2 on the upstream side and the water vapor pressure of the supply path 11 shut off from the downstream side of the three-way valve 45 to the supply port of the scroll expander 2 Can be performed quickly, which can prevent the over-rotation of the scroll expander 2.

  At the start of the power generation device 1d, the control unit 10 of the power generation device 1d opens the first shut-off valve 41 while keeping the three-way valve 45 in communication with the bypass passage 13 and does not supply water vapor to the scroll expander 2. For a while, steam is allowed to flow from the bypass 13 to the exhaust 12. Then, after the steam is sufficiently flowed to the bypass path 13, the three-way valve 45 is made to communicate with the supply path 11, and the supply of the steam to the scroll expander 2 is started.

  As a result, in the power generation device 1d, foreign matter and condensed water are flowed to the discharge path 12 by the water vapor. Therefore, even if the three-way valve 45 is switched to restart the supply of water vapor to the scroll expander 2, the foreign matter is scroll expansion. While being able to prevent entering into machine 2, condensed water can be prevented from breaking down scroll expander 2 as a water hammer. Therefore, there is no need to provide a steam trap for discharging the condensed water and the drain at the time of startup, and the apparatus can be simplified.

  In each of the above-described embodiments, the scroll power generator 1, 1a, 1b, 1c, 1d uses the scroll expander 2. However, as the expander, a screw expander, a vane expander, and a reciprocating expansion are used. It may be a mechanical or swash plate type expander.

  In each of the above-described embodiments, the power generation devices 1, 1a, 1b, 1c and 1d use water vapor as the working fluid, but the working fluid is not limited to such water vapor, and this type of working fluid is not limited. It may be various working fluid used for power generation using exhaust heat.

  Furthermore, in each of the above-described embodiments, the power generation devices 1, 1a, 1b, 1c and 1d are driven by the induction generator 3, but the drive is limited to such an induction generator 3. Other induction generators or synchronous generators may be used, as long as they are generators that lose load torque during an emergency such as a power failure or grid disconnection. In addition to the generator, a water pump or a hydraulic pump may be driven. Alternatively, it may be the auxiliary power of the engine. In this case, power is transmitted via a clutch or the like, and the present invention is effective when the power transmission is rapidly shut off by, for example, disengaging the clutch in an emergency.

  Furthermore, in each of the embodiments described above, the power generation devices 1, 1a, 1b, 1c, 1d are configured to pump the condensed water stored in the condensate tank 6 from the drainage path 14 connected to the condensate tank 6. Is configured to supply water to the water supply tank (not shown), but after supplying from the condensate tank 6 to the evaporator 9 using engine exhaust heat and using it for absorption of engine exhaust heat, The circulation path may be configured to be supplied to the supply path 11 as steam. Under the present circumstances, engine heat_generation | fever can be collect | recovered from the waste gas discharged | emitted from engines, such as a diesel engine used as a main generator, for example. In addition to engine exhaust heat, for example, steam may be generated using geothermal heat, or steam may be generated using factory exhaust heat. Alternatively, the exhaust heat of the incinerator may be used to generate steam. Furthermore, when the circulation path is configured, various working fluids other than water may be used as the working fluid.

DESCRIPTION OF SYMBOLS 1 motive power generator 1a motive power generator 1b motive power generator 1c motive power generator 1d motive power generator 10 control part 11 supply path 12 discharge path 13 bypass path 2 scroll expander (expansion machine)
3 Induction generator (generator)
41 first shutoff valve 42 bypass valve 43 second shutoff valve 44 third shutoff valve 45 three-way valve A branch point B junction point

Claims (9)

A power generating device for extracting power from an output shaft connected to an expander by supplying a working fluid flowing through a supply path to the expander and driving the expander.
Between the supply path and the discharge path of the expander, a bypass path is provided for bypassing the supply path to the discharge path, and a first shutoff valve is provided downstream of the junction of the bypass path and the discharge path. And a bypass valve is provided in the bypass path, and a second shutoff valve is provided on the upstream side of a branch point between the supply path and the bypass path,
When the exciting current of the expander is cut off, closes the first shut-off valve opens the bypass valve, then, the power control unit that controls so as to close the second shutoff valve is characterized in that provided Generator.   The first shut-off valve is normally open and closed when activated, and the bypass valve is closed normally and opened when activated. Power generator.   The power generation device according to claim 1, wherein a third shutoff valve is provided downstream of a branch point between the supply path and the bypass path in the supply path.   The power generation device according to claim 1 or 2, wherein a second shutoff valve is provided on the upstream side of a branch point between the feed path and the bypass path in the feed path, and a third shutoff valve is provided on the downstream side. .   The power generation device according to claim 4, further comprising a control unit that controls the first shut-off valve, the second shut-off valve, and the bypass valve to open while closing the third shut-off valve at the time of startup.   The power generation device according to claim 1 or 2, wherein a three-way valve is provided at a branch point between the supply path and the bypass path in the supply path.   The power generator according to any one of claims 1 to 6, wherein the working fluid is water vapor.   The power generation device according to any one of claims 1 to 7, wherein the power supply target is an induction generator.   The power generating device according to any one of claims 1 to 8, wherein the expander is a scroll expander directly connected to the output shaft.

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