JP2014190276A - Power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation system ensuring higher safety.SOLUTION: A power generation system for generating electric power in a Rankine cycle with an organic medium used as a working fluid, comprises: a heat exchanger causing heat exchange between a heat source and the working fluid and evaporating the working fluid to produce steam; a steam turbine to which the steam heated in the heat exchanger is supplied, and that rotates by the steam; a generator coupled to the steam turbine; a condenser cooling the steam passing through the steam turbine to change the working fluid to a liquid working fluid; a liquid supply pump pressurizing the working fluid supplied from the condenser and supplying the pressurized working fluid to the heat exchanger; a circulation path in which the working fluid and the steam circulate by connecting the heat exchanger, the steam turbine, the condenser, and the liquid supply pump; a temperature decreasing portion arranged in the circulation path, and decreasing a temperature of the working fluid supplied to the heat exchanger; a leakage detection portion detecting leakage of the working fluid; and a control device that actuates the temperature decreasing portion to decrease the temperature of the working fluid supplied to the heat exchanger if the leakage detection portion detects the leakage of the working fluid.

Description

  The present invention relates to a power generation system that generates heat by exchanging heat between a heat source and a working fluid.

  There is a binary cycle power generation system in which heat is exchanged between a heat source and a working fluid, and the working fluid is heated by the heat source to convert the working fluid into steam and introduce the steam into a steam turbine to generate power. In the binary cycle system, the working fluid is circulated in a Rankine cycle.

Power generation system using a binary cycle method, as a heat source, geothermal and using the earth, industrial waste heat, can use the waste heat or the like of the air conditioning, since there is no possible to burn the fuel in the ground, CO ₂ Emissions are extremely low, resulting in an environmentally friendly power generation system. For example, when geothermal heat is used as a heat source, the power generation system guides a geothermal fluid to a heat exchanger, performs heat exchange between the geothermal fluid and the working fluid with the heat exchanger, and collects only the heat into the working fluid. All fluid is returned to the ground. The power generation system generates power by introducing steam of a working fluid heated by a geothermal fluid into a steam turbine.

  Here, a power generation system using a binary cycle system that circulates a working fluid in a Rankine cycle may use a medium other than water (hereinafter also referred to as an organic medium) as the working fluid. Some organic media are problematic if they leak from distribution channels. On the other hand, in Patent Document 1, after the leakage from the hydrocarbon evaporator is detected, the contents of the hydrocarbon evaporator are purged with an inert gas. An organic Rankine cycle energy recovery system with a configured inert gas source is described.

JP 2012-31863 A

  As described in Patent Document 1, by supplying an inert gas to a hydrocarbon evaporator, that is, a heat exchanger, the heat exchanger can be brought into a safe state, but there is room for improvement as a power generation system. There is.

  In view of the above problems, an object of the present invention is to provide a power generation system with higher safety.

  The present invention for solving the above-described problems is a power generation system that generates electricity in a Rankine cycle using an organic medium as a working fluid, and performs heat exchange between a heat source and the working fluid, and heat using the working fluid as steam. An exchanger, the steam heated by the heat exchanger is supplied, the steam turbine rotated by the steam, a generator connected to the steam turbine, and the steam that has passed through the steam turbine is cooled, A condenser as a liquid working fluid, a liquid feed pump that pressurizes the working fluid supplied from the condenser and sends the liquid to the heat exchanger, the heat exchanger, the steam turbine, the condenser A circulation path for connecting the water device and the liquid feed pump to circulate the working fluid and the steam, and a temperature reduction unit that is disposed in the circulation path and lowers the temperature of the working fluid supplied to the heat exchanger. When, A leakage detector for detecting leakage of the working fluid, and when the leakage of the working fluid is detected by the leakage detector, the temperature of the working fluid supplied to the heat exchanger by operating the temperature reduction unit And a control device for lowering.

  The temperature reduction unit includes a recovery line connected to the circulation path, a recovery valve that opens and closes the recovery line, and a recovery tank that is connected to the recovery line and stores the working fluid. It is preferable that the working fluid collecting mechanism opens the collecting valve and collects at least a part of the working fluid flowing through the circulation path into the collecting tank through the collecting line.

  Moreover, it is preferable that the said recovery line is connected between the said liquid feed pump of the said circulation path, and the said heat exchanger.

  Moreover, it is preferable to further have a purge gas supply mechanism that is connected to the circulation path and supplies an inert gas to a path through which the working fluid of the heat exchanger flows.

  When it is determined that maintenance is to be performed, the control device preferably operates the temperature reduction unit to lower the temperature of the working fluid supplied to the heat exchanger.

  The working fluid is preferably a combustible medium having a boiling point lower than that of water.

  The working fluid is preferably a medium composed of a compound having a boiling point of 25 ° C. or higher.

  The working fluid is preferably pentane, isopentane, pentene, hexane, isohexane, hexene, methylcyclobutane, methylcyclopentane, cyclopentane, and cyclohexane, or a mixture thereof.

  According to the present invention, safety can be further increased.

FIG. 1 is a schematic diagram showing a geothermal power generation system according to an embodiment of the power generation system of the present invention. FIG. 2 is a flowchart showing an example of the operation of the geothermal power generation system. FIG. 3 is a flowchart showing an example of the operation of the geothermal power generation system.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the content described in the following Examples. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

  A case where the power generation system of the present invention is applied to a geothermal power generation system will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a geothermal power generation system according to an embodiment of the power generation system of the present invention. The geothermal power generation system 10 according to the present embodiment heats a working fluid (working medium) 19 with a heat source fluid 18 of geothermal heat, and rotates the steam turbine 13 with the heated working fluid 19 to generate electric power by binary system. It is a power generation system. The geothermal power generation system 10 circulates the working fluid 19 in a Rankine cycle in which pressurization, heat absorption, adiabatic expansion, and heat dissipation are repeated with respect to the working fluid 19, and rotates the steam turbine 13 with steam in the adiabatic expansion process.

  As shown in FIG. 1, a geothermal power generation system 10 according to the present embodiment includes a heat exchanger (evaporator) 12, a steam turbine 13, a generator 14, a condenser 15, a cooling tower 16, and a control. The apparatus 30 includes a leakage detection unit 32, a working fluid recovery mechanism 40, a purge gas supply mechanism 50, and liquid feed pumps P1 and P2. Further, the geothermal power generation system 10 includes a heat source fluid supply line L11 through which the heat source fluid 18 is circulated and a circulation path 11 through which the working fluid 19 is circulated.

  The circulation path 11 includes a working fluid supply line L12 and a working fluid steam supply line L13, and connects the heat exchanger 12, the steam turbine 13, the condenser 15, and the liquid feed pump P1 in this order. Circulate with. The circulation path 11 is also connected to the liquid feed pump P1 and the heat exchanger 12, and supplies the working fluid 19 from the liquid feed pump P1 to the heat exchanger 12. The working fluid supply line L12 is a flow path for the working fluid 19, and connects the condenser 15, the liquid feed pump P1, and the heat exchanger 12. The liquid feed pump P1 sends the working fluid 19 from the condenser 15 side to the heat exchanger 12 side. An adjustment valve V12 capable of adjusting the flow rate of the working fluid 19 is disposed between the liquid feed pump P1 and the heat exchanger 12 in the working fluid supply line L12. The working fluid vapor supply line L <b> 13 is a flow path of the working fluid vapor 23 that is the vapor of the working fluid 19, and connects the heat exchanger 12, the steam turbine 13, and the condenser 15.

  Examples of the heat source fluid 18 include geothermal steam, geothermal water, geothermal gas, or those containing two or more of these. The working fluid 19 is supplied to the heat exchanger 12 through the working fluid supply line L12, and heat is exchanged with the heat source fluid 18 in the heat exchanger 12 to be heated. The supply amounts of the heat source fluid 18 and the working fluid 19 are adjusted by adjusting valves V11 and V12 provided in the heat source fluid supply line L11 and the working fluid supply line L12.

  As the working fluid 19, a medium (organic medium) other than water can be used. Here, the working fluid 19 preferably uses a medium having a lower boiling point than water, and more preferably uses a combustible medium having a lower boiling point than water. The working fluid 19 is also preferably a medium composed of a compound having a boiling point of 25 ° C. or higher. The working fluid 19 includes various hydrocarbons, specifically methanol (boiling point 65 ° C.), ethanol (boiling point 78 ° C.), propanol (boiling point 82 ° C. or 97 ° C.), pentane (boiling point 36 ° C.), isopentane (boiling point). 28 ° C), pentene (boiling point 37 ° C), hexane (boiling point 69 ° C), isohexane (boiling point 70 ° C), hexene (boiling point 63 ° C), methylcyclobutane (boiling point 36 ° C), methylcyclopentane (boiling point 72 ° C), cyclohexane More preferably, one or a mixture of pentane (boiling point 49 ° C.) and cyclohexane (boiling point 81 ° C.) is used. In addition, as the working fluid 19, a nonflammable medium may be used, and in this case, a low boiling point medium such as Freon or ammonia is exemplified. By using the medium, heat exchange can be performed efficiently, and the working fluid can be circulated smoothly.

  The heat exchanger 12 heats the working fluid 19 by the heat source fluid 18 ejected from the production well (production well) 21 to evaporate the working fluid 19 to become steam. The heat source fluid 18 ejected from the production well 21 is passed through the heat source fluid supply line L11 to the heat exchanger 12, heat exchanged with the working fluid 19 in the heat exchanger 12, and the working fluid 19 is heated. Returned to the well (reduction well) 22. Further, the circulation path 11 is connected to the heat exchanger 12 as described above, and the working fluid 19 is supplied.

  The heat exchanger 12 only needs to be able to exchange heat between the heat source fluid 18 and the working fluid 19. For example, the heat exchanger 12 pipes a tube through which the heat source fluid 18 flows in series through the evaporation chamber inside the shell. A shell and tube type is used.

  The heat exchanger (evaporator) 12 exchanges heat between the heat source fluid 18 and the working fluid 19 and heats the working fluid 19 with the heat source fluid 18. The working fluid 19 exchanges heat with the heat source fluid 18 in the heat exchanger 12, evaporates (vaporizes) when heated, and becomes a vapor (working fluid vapor) 23 of the high temperature working fluid 19.

  The steam turbine 13 obtains a rotational force from the pressure of the working fluid steam 23 that has become steam by heating the working fluid 19 in the heat exchanger 12, and the turbine shaft 26 is rotationally driven. The generator 14 is connected to the turbine shaft 26, and generates electric power by driving and rotating from the turbine shaft 26.

  The condenser 15 is used as a drive source for the steam turbine 13 to cool the working fluid steam 23 discharged from the steam turbine 13 to form condensed water 29. The condenser 15 is connected to the condenser 15 via a cooling medium supply line L14 through which the cooling water 28 flows and a cooling medium recovery line L15. The condenser 15 exchanges heat between the cooling water 28 and the working fluid vapor 23 to cool the working fluid vapor 23.

  Specifically, the condenser 15 can cool the working fluid vapor 23 with the cooling water 28 supplied from the cooling tower 16 via the cooling medium supply line L14, and the cooling medium supply line L14. A liquid feed pump P <b> 2 for supplying the cooling water 28 from the cooling tower 16 to the condenser 15 is disposed above.

  Further, between the condenser 15 and the cooling tower 16, a cooling medium recovery line L15 through which the cooling water 28 after cooling the working fluid vapor 23 in the condenser 15 flows is disposed. The cooling tower 16 recovers the cooling water 28 discharged from the condenser 15 in the cooling medium recovery line L15. The cooling tower 16 includes a heat radiating mechanism such as a fan, cools the collected cooling water 28 by the heat radiating mechanism, and supplies it to the condenser 15 through the cooling medium supply line L14.

  The control device 30 acquires and processes information from each part of the geothermal power generation system 10 and controls the operation of each part. The control device 30 has a known configuration including a processing unit having a CPU (Central Processing Unit) and the like, a storage unit such as a RAM (Random Access Memory), and the like.

  The leakage detector 32 is disposed outside the circulation path 11 and detects leakage of the working fluid 19 in the vicinity of the circulation path 11. The leak detection unit 32 of the present embodiment is attached in the vicinity between the casing of the steam turbine 13 and the turbine shaft 26. Note that the leak detection unit 32 may be disposed in a connection portion (a connection portion between the upper compartment and the lower compartment) of the steam turbine 13. Further, it may be provided in the vicinity of the circulation path 11 and may be provided other than in the vicinity of the steam turbine 13. Further, the leak detection unit 32 may be provided at a plurality of locations in the circulation path 11.

  The leak detection unit 32 is a sensor that detects the working fluid 19, and detects whether the working fluid 19 is leaking from the circulation path 11 by detecting the working fluid 19. Here, the geothermal power generation system 10 may add a substance to be detected to the working fluid 19 and detect the substance to be detected by the leakage detection unit 32. The leak detector 32 only needs to be able to detect the leak, and may detect the presence or absence of the working fluid (or the substance to be detected) 19 to be detected, may detect the concentration, It may be detected. In the case where the working fluid (or the substance to be detected) 19 is a substance in the atmosphere, the leak detector 32 preferably detects the concentration and the amount, and detects the leak based on the variation.

  The leak detection unit 32 is connected to a control device 30 that controls each unit of the geothermal power generation system 10, and the leak detection unit 32 transmits a signal that detects leakage of the working fluid 19 to the control device 30. The geothermal power generation system 10 may determine the presence or absence of leakage by the leakage detection unit 32 or the presence or absence of leakage by the control device 30.

  The working fluid recovery mechanism 40 is a mechanism that recovers the working fluid 19 and is connected to the circulation path 11. The working fluid recovery mechanism 40 includes a recovery tank 41, a recovery line 42, and a recovery valve 44. The recovery tank 41 is a tank that stores the working fluid 19. The recovery line 42 is a pipe connecting the working fluid supply line L12 and the recovery tank 41. The recovery line 42 is connected between the liquid feed pump P1 of the working fluid supply line L12 and the control valve V12. The recovery valve 44 is provided in the recovery line 42 and is a valve that opens and closes the flow path of the recovery line 42. The working fluid recovery mechanism 40 closes the recovery valve 44 so that the working fluid 19 does not flow through the recovery line 42 and the recovery tank 41. The working fluid recovery mechanism 40 opens the recovery valve 44 so that the working fluid 19 flows from the working fluid supply line L12 to the recovery line 42 and the recovery tank 41. The operation of the working fluid recovery mechanism 40 is controlled by the control device 30.

  The purge gas supply mechanism 50 is a mechanism that supplies a purge gas that is an inert gas and causes the purge gas to flow into the circulation path 11, and is connected to the circulation path 11. The purge gas supply mechanism 50 includes a purge gas storage tank 52, a purge gas line 54, and a purge gas valve 56. The purge gas storage tank 52 is a tank that stores an inert gas that is a purge gas. Nitrogen, argon, etc. can be used as the inert gas. Note that an incombustible gas may be used as the purge gas instead of the inert gas. The purge gas line 54 is a pipe connecting the working fluid supply line L12 and the purge gas storage tank 52. The purge gas line 54 is connected between the control valve V12 of the working fluid supply line L12 and the heat exchanger 12. The purge gas valve 56 is provided in the purge gas line 54 and opens and closes the flow path of the purge gas line 54. The purge gas supply mechanism 50 closes the purge gas valve 56 so that the purge gas does not flow from the purge gas line 54 and the purge gas storage tank 52 toward the working fluid supply line L12. The purge gas supply mechanism 50 opens the purge gas valve 56 so that the purge gas flows from the purge gas line 54 and the purge gas storage tank 52 toward the working fluid supply line L12. The operation of the purge gas supply mechanism 50 is controlled by the control device 30.

  Next, the operation of the geothermal power generation system 10 will be described. When generating power, the geothermal power generation system 10 drives the liquid feed pump P1 to pressure-feed the working fluid 19 in the working fluid supply line L12 from the condenser 15 to the heat exchanger 12. Thereby, the working fluid 19 of the condenser 15 is pressurized and supplied to the heat exchanger 12. Further, the geothermal power generation system 10 adjusts the opening of the control valve V12 provided in the working fluid supply line L12 and the drive of the liquid feed pump P1, thereby supplying the amount of working fluid 19 to the heat exchanger 12 and the time of supply. The pressure can be adjusted.

  The geothermal power generation system 10 generates heat between the working fluid 19 supplied to the heat exchanger 12 and the heat source fluid 18 that is ejected from the production well 21 and flows to the heat exchanger 12 through the heat source fluid supply line L11. Exchange. As a result, the working fluid 19 is heated and becomes high-temperature working fluid vapor 23. Further, the heat source fluid 18 that exchanges heat with the working fluid 19 in the heat exchanger 12 flows into the reduction well 22 through the heat source fluid supply line L11. Further, the geothermal power generation system 10 can adjust the flow rate of the heat source fluid 18 flowing through the heat source fluid supply line L11 by adjusting the control valve V11 provided in the heat source fluid supply line L11. Thereby, the amount of heat exchanged by the heat exchanger 12, that is, the amount of heating of the working fluid 19 can be adjusted.

  The working fluid steam 23 that has become high-temperature steam in the heat exchanger 12 is supplied to the steam turbine 13 through the working fluid steam supply line L13. In the steam turbine 13, the turbine shaft 26 is rotationally driven by the pressure of the working fluid steam 23, and the generator 14 is driven and rotated by this rotational driving, whereby the generator 14 generates power.

  The working fluid steam 23 used as the driving source of the steam turbine 13 is supplied to the condenser 15 through the working fluid supply line L12. Further, the cooling water 28 cooled by the cooling tower 16 is supplied to the condenser 15 through the cooling medium supply line L14 by being pumped by the liquid feed pump P2.

  The condenser 15 exchanges heat between the working fluid vapor 23 and the cooling water 28, and cools and condenses the working fluid vapor 23 to make the condensate 29. The condensate 29 flows from the condenser 15 to the working fluid supply line L12 and is supplied to the heat exchanger 12 again by the liquid feed pump P1. In the circulation path 11, the working fluid 19 is circulated while repeatedly expanding and condensing the working fluid 19 as described above. The geothermal power generation system 10 operates as described above to circulate the working fluid 19, collects the heat of the heat source fluid 18 with the working fluid 19, rotates the steam turbine 13 with the collected heat energy, and generates power. Do.

  Next, in the geothermal power generation system 10, while the working fluid 19 circulates in the circulation path 11, the leakage detection unit 32 continuously detects the leakage of the working fluid 19 from the circulation path 11. Specifically, the geothermal power generation system 10 detects the substance to be detected by the leakage detection unit 32. The leak detection unit 32 transmits the detected result to the control device 30 by an electrical signal. The control device 30 performs opening / closing control of the recovery valve 44 of the working fluid recovery mechanism 40 and the purge gas valve 56 of the purge gas supply mechanism 50 according to the presence or absence of leakage of the working fluid 19. The control device 30 closes both the recovery valve 44 and the purge gas valve 56 at the normal time when there is no leakage of the working fluid 19.

  Next, an outline of a processing procedure when performing control at the time of leakage in the geothermal power generation system 10 according to the present embodiment will be described. FIG. 2 is a flowchart showing an example of the operation of the geothermal power generation system. The operation shown in FIG. 2 can be realized by the control device 30 executing a process based on the detection result of each unit.

  The control device 30 determines whether there is a leakage of the working fluid 19 based on the detection result of the leakage detection unit 32 (step S12). That is, the control device 30 determines whether or not there is a leakage of the working fluid 19 based on whether or not the leakage detection unit 32 disposed outside the circulation path 11 has detected the leakage. When it is determined that there is no leakage of the working fluid 19 (No in Step S12), the control device 30 determines again whether there is a leakage of the working fluid 19 (Step S12).

  Next, when it is determined that there is a leakage of the working fluid 19 (Yes in Step S12), the control device 30 opens the recovery valve 44 (Step S14). The geothermal power generation system 10 opens at least a part of the working fluid 19 among the working fluid 19 supplied from the liquid feed pump P1 toward the heat exchanger 12 through the working fluid supply line L12 by opening the recovery valve 44. Into the recovery tank 41. Thereby, the amount of the working fluid 19 that circulates in the circulation path 11 is reduced, and the pressure in the circulation path 11 is reduced. Moreover, the temperature of the working fluid 19 is also reduced by reducing the pressure. Further, by recovering the working fluid 19 on the upstream side of the heat exchanger 12, the liquid working fluid 19 can be recovered in the recovery tank 41. Thereby, the working fluid 19 can be collected smoothly.

  Next, the control device 30 opens the purge gas valve 56 (step S16) and ends this process. The geothermal power generation system 10 opens the purge gas valve 56 so that the purge gas in the purge gas storage tank 52 flows into the working fluid supply line L12. By supplying the purge gas to the circulation path 11, the gas that fills the circulation path 11 and the gas that leaks out from the circulation path 11 can be made inert. Thereby, it can suppress having a bad influence on the exterior. Further, even when a flammable compound is used for the working fluid 19, it is possible to suppress the leakage of a large amount of flammable compound.

  The geothermal power generation system 10 detects the leakage of the working fluid 19 by the leak detection unit 32. When the working fluid 19 leaks, the geothermal power generation system 10 is operated by operating the working fluid recovery mechanism 40 and the purge gas supply mechanism 50. It can be operated safely. The geothermal power generation system 10 can lower the temperature and pressure of the circulation path 11 more quickly by collecting the working fluid 19 with the working fluid collection mechanism 40. Thereby, since the differential pressure | voltage between the circulation path 11 and the exterior can be reduced, the quantity which leaks from the part which the working fluid 19 in the circulation path 11 has leaked can be reduced.

  Moreover, since the geothermal power generation system 10 of this embodiment can collect | recover with a liquid by collect | recovering the working fluid 19 in the upstream of the heat exchanger 12, it can collect | recover more working fluid 19 rapidly. can do. Further, by providing the liquid feed pump P1 to be pressurized upstream of the connecting portion between the recovery line 42 and the working fluid supply line L12, the liquid feed pump P1 can be used as the liquid feeding means of the working fluid recovery mechanism 40, It is possible to facilitate the working fluid 19 to flow into the recovery tank 41.

  The geothermal power generation system 10 can also reuse the collected working fluid 19 by collecting the working fluid 19 in the collection tank 41.

  Further, when using a flammable medium as the working fluid 19, the geothermal power generation system 10 can reduce the risk of the working fluid 19 being burned by being able to quickly suppress leakage to the outside. Further, by storing the working fluid 19 in the collection tank 41 without discharging it to the outside, it is possible to reduce the possibility that the working fluid 19 is burned during the collection while the circulation path 11 is shifted to a safe state.

  Further, the geothermal power generation system 10 may collect the working fluid 19 by the working fluid collection mechanism 40 even when the working fluid 19 is not leaked. For example, the geothermal power generation system 10 may collect the working fluid 19 with the working fluid collection mechanism 40 during maintenance.

  FIG. 3 is a flowchart showing an example of the operation of the geothermal power generation system. The control device 30 determines whether to perform maintenance (step S22). The control device 30 determines whether to perform maintenance based on the input from the operator and the set conditions. When it is determined that the maintenance is not to be performed (No in step S22), the control device 30 determines again whether to perform the maintenance (step S22).

  Next, when it is determined that the maintenance is to be performed (Yes in Step S22), the control device 30 opens the recovery valve 44 (Step S24). The geothermal power generation system 10 opens at least a part of the working fluid 19 among the working fluid 19 supplied from the liquid feed pump P1 toward the heat exchanger 12 through the working fluid supply line L12 by opening the recovery valve 44. Into the recovery tank 41.

  Next, the control device 30 opens the purge gas valve 56 (step S26) and ends this process. The geothermal power generation system 10 opens the purge gas valve 56 to cause the purge gas in the purge gas storage tank 52 to flow into the working fluid supply line L12.

  In this way, the geothermal power generation system 10 can recover the working fluid 19 to the working fluid collection mechanism 40 even during maintenance, so that the working fluid 19 is not filled in the circulation path 11 quickly and safely. it can. Further, the geothermal power generation system 10 can effectively utilize the recovered working fluid 19 by refilling the circulation path 11 with the working fluid 19 of the working fluid recovery mechanism 40.

  Here, although the geothermal power generation system 10 of the present embodiment is provided with the purge gas supply mechanism 50, the purge gas supply mechanism 50 may not be provided.

  Although an embodiment in which the present invention is applied to a geothermal power generation system has been described, the present invention is not limited to this, and heat is recovered from a heat source using a working fluid, and the working fluid is circulated using a Rankine cycle. It can be used for various systems that generate power by rotating a turbine with steam of a working fluid. That is, the heat of various mechanisms can be used as a heat source for heating the working fluid. As the heat source, for example, heat generated from marine machinery, factory waste heat, gas turbine waste heat, solar heat, heat generated by combustion of industrial waste, and the like can be used. That is, the power generation system can generate power from heat generated from marine machinery, factory waste heat, gas turbine waste heat, solar heat, and heat generated by combustion of industrial waste. The power generation system may be an ocean temperature difference power generation system. In this case, the heat source is warm water on the ocean surface. In addition, a cooling mechanism using deep sea cold water is used instead of the cooling tower.

DESCRIPTION OF SYMBOLS 10 Geothermal power generation system 11 Circulation path 12 Heat exchanger 13 Steam turbine 14 Generator 15 Condenser 16 Cooling tower 18 Heat source fluid 19 Working fluid 21 Production well (production well)
22 Reduction well (reduction well)
23 Working Fluid Steam (Working Fluid Steam)
26 Turbine shaft 28 Cooling water 29 Condensate 30 Control device 32 Leakage detection unit 40 Working fluid recovery mechanism 41 Recovery tank 42 Recovery line 44 Recovery valve 50 Purge gas supply mechanism 52 Purge gas storage tank 54 Purge gas line 56 Purge gas valve L11 Heat source fluid supply line L12 Working fluid supply line L13 Working fluid vapor supply line L14 Cooling medium supply line L15 Cooling medium recovery line P1, P2 Liquid feed pump

Claims (8)

A power generation system that generates electricity in Rankine cycle using an organic medium as a working fluid
A heat exchanger that exchanges heat between the heat source and the working fluid and uses the working fluid as steam;
A steam turbine supplied with the steam heated by the heat exchanger and rotated by the steam;
A generator coupled to the steam turbine;
A condenser that cools the steam that has passed through the steam turbine to form a liquid working fluid;
A liquid feed pump that pressurizes the working fluid supplied from the condenser and feeds the working fluid to the heat exchanger;
A circulation path for connecting the heat exchanger, the steam turbine, the condenser and the liquid feed pump, and circulating the working fluid and the steam;
A temperature reduction unit that is arranged in the circulation path and reduces the temperature of the working fluid supplied to the heat exchanger;
A leakage detector for detecting leakage of the working fluid;
A control device that operates the temperature reduction unit to lower the temperature of the working fluid supplied to the heat exchanger when the leakage detection unit detects leakage of the working fluid. Power generation system.   The temperature reduction unit includes a recovery line connected to the circulation path, a recovery valve that opens and closes the recovery line, and a recovery tank that is connected to the recovery line and stores the working fluid. 2. The power generation system according to claim 1, wherein the power generation system is a working fluid recovery mechanism that opens a valve and recovers at least a part of the working fluid flowing through the circulation path to the recovery tank via the recovery line. .   The power generation system according to claim 2, wherein the recovery line is connected between the liquid feeding pump and the heat exchanger in the circulation path.   4. A purge gas supply mechanism connected to the circulation path and further supplying an inert gas to a path through which the working fluid of the heat exchanger flows from the circulation path. The power generation system described in 1.   The said control apparatus operates the said temperature reduction part, when it determines with performing a maintenance, The temperature of the said working fluid supplied to the said heat exchanger is reduced, Any one of Claim 1 to 3 characterized by the above-mentioned. The power generation system according to claim 1.   The power generation system according to any one of claims 1 to 5, wherein the working fluid is a combustible medium having a boiling point lower than that of water.   The power generation system according to any one of claims 1 to 5, wherein the working fluid is a medium composed of a compound having a boiling point of 25 ° C or higher.   6. The working fluid according to claim 1, wherein the working fluid is one or a mixture of pentane, isopentane, pentene, hexane, isohexane, hexene, methylcyclobutane, methylcyclopentane, cyclopentane and cyclohexane. The power generation system according to one item.

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