JP2018053784A - Binary power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a binary power generation system, having a plurality of heat medium lines to heat water, capable of preventing a negative impact on a binary power generation device when switching the flow passages.SOLUTION: A binary power generation system 1 comprises: a water heating heat medium line including a first flow passage L1 and a second flow passage L2; a hot water tank 2 with the first flow passage L1 and the second flow passage L2 stored therein to heat water through heat exchange between a heat medium and the water; a binary power generation device 3 which has a power generating heat medium line L4 connected to a downstream side of a junction 8 of the first flow passage L1 and the second flow passage L2; switching means 11 and 12 which can switch the flow passage of the heat medium in the water heating heat medium line; and temperature decrease curbing means 6 which curbs a temperature decrease of the heat medium flowing into the binary power generation device 3 when the flow passages of the heat medium are switched by the switching means 11 and 12 so that the heat medium flows in the first flow passage L1 and the second flow passage L2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a binary power generation system.

  As described in Patent Document 1, a system that performs binary cycle power generation using a geothermal fluid is known. In this system, the temperature of the geothermal fluid supplied to the power generation system is adjusted by mixing a part of the low temperature geothermal fluid discharged from the power generation system with the high temperature geothermal fluid obtained from the geothermal sampling system.

JP-A-6-147653

  By the way, a system in which the heat medium used for supplying hot water is further used for binary power generation is known. For example, as shown in FIG. 6, in the conventional system 100, for controlling the temperature of the hot water tank 2, two heating medium lines (flow path L1 and flow path L2) for water heating can be provided. The heat medium can be constantly flowed through the flow path L1, and the heat medium can be flowed through the flow path L2 as necessary. Such channel switching can be performed by controlling the opening degree of the valve 101 and the valve 102.

  In this system 100, after the heat medium is flowed only in the flow path L1, the flow path is switched and the heat medium is also flowed in the flow path L2, so that the cold heat medium staying in the flow path L2 is retained. It can flow into the binary power generator 3. When the temperature of the heat medium flowing into the binary power generation device 3 rapidly decreases, there is a possibility that the binary power generation device 3 is adversely affected. For example, if the binary power generation device 3 is provided with a turbine, the turbine (bearing or the like) may be broken.

  It is an object of the present invention to provide a binary power generation system capable of suppressing adverse effects on a binary power generation apparatus when a flow path is switched when a plurality of heat medium lines for heating water is provided. Objective.

  A binary power generation system according to an aspect of the present invention is a water heating heat medium line for heating water, and includes a first flow path through which the heat medium passes, a branch from the first flow path, and a branch point thereof. A water heating heat medium line including a second flow path that merges with the first flow path on the downstream side, a first flow path and a second flow path, and storing water, A hot water tank for heating water by heat exchange, and a heating medium line for power generation for performing binary power generation through a heat medium that is connected downstream from the confluence of the second flow path with respect to the first flow path And a power generation heat medium line, a binary power generation device that generates power by evaporating the working medium by exchanging heat between the heat medium and the internal working medium, and only the first flow path, or The heat medium passes through the first flow path and the second flow path, A switching means capable of switching the flow path of the heat medium in the heating heat medium line, and provided between the first flow path and the second flow path, or between the junction and the power generation heat medium line. When the heat medium flow path is switched so that the heat medium passes through the first flow path and the second flow path by means, a decrease in the temperature of the heat medium flowing into the binary power generation device through the power generation heat medium line is suppressed. Temperature drop suppression means.

  According to this binary power generation system, the hot water tank is provided with the first flow path and the second flow path through which the heat medium passes. Since the flow of the heat medium in the heat medium line for water heating is switched so that the heat medium passes through only the first flow path or the first flow path and the second flow path by the switching means, it is obtained in the hot water tank. Heating according to the amount of heat generated is possible. That is, the second channel is a channel for controlling the heating amount. When the amount of heat required in the hot water tank is relatively small, the flow path is switched by the switching means, and the heat medium can flow only in the first flow path. And when the calorie | heat amount calculated | required in a hot water tank increases, a flow path is switched by the switching means, and a heat medium can also flow into a 2nd flow path. At this time, the temperature decrease suppression means provided around the second flow path suppresses a decrease in the temperature of the heat medium flowing into the binary power generation device through the power generation heat medium line. Therefore, it is possible to suppress an adverse effect on the binary power generator when the flow path is switched.

  In some embodiments, the temperature decrease suppressing unit suppresses a decrease in the temperature of the heat medium using heat of the heat medium. In this case, there is no need to use a separate heat source or the like, and the energy efficiency of the entire system is excellent.

  In some embodiments, the temperature decrease suppressing unit includes a buffer tank that is provided between the junction and the power generation heat medium line and stores a certain amount of heat medium. In this case, even when a cold heat medium stays in the second flow path, a temperature buffering action is obtained by the heat medium stored in the buffer tank. As a result, a decrease in the temperature of the heat medium flowing into the binary power generation device through the power generation heat medium line is suppressed.

  In some embodiments, the temperature decrease suppressing means includes a heat storage body that is disposed around an intermediate heat medium line that connects the junction and the heat generating medium line for power generation and performs heat exchange with the heat medium. . In this case, even when a cold heat medium stays in the second flow path, the heat medium flowing from the second flow path is heated by heat exchange between the heat storage body and the heat medium. As a result, a decrease in the temperature of the heat medium flowing into the binary power generation device through the power generation heat medium line is suppressed.

  In some embodiments, the temperature decrease suppression unit is configured to perform heat exchange in which a plurality of portions of the intermediate heat medium line connecting between the junction and the heat generating medium line for power generation pass and heat exchange is performed between the heat mediums. Including a bowl. In this case, even when a cold heat medium stays in the second flow path, the heat medium flowing from the second flow path is heated by heat exchange between the heat media in the heat exchanger. As a result, a decrease in the temperature of the heat medium flowing into the binary power generation device through the power generation heat medium line is suppressed.

  In some embodiments, the temperature decrease suppressing means is connected between the first flow path and the second flow path so as to bypass the switching means, and heat is generated regardless of a switching state of the flow path of the heat medium by the switching means. A bypass line capable of flowing the medium through the second flow path is included, and the flow rate of the heat medium in the bypass line is smaller than the flow rate of the heat medium in either the first flow path or the second flow path. Even when the flow path of the heat medium is only the first flow path by the switching means, a small amount of the heat medium can flow through the second flow path through the bypass line. Therefore, the temperature of the heat medium in the second flow path is prevented from excessively decreasing even when the second flow path is not used for heating water. Thereby, at the time of switching of a flow path, the fall of the temperature of the heat medium which flows into a binary electric power generating apparatus through the heat medium line for electric power generation is suppressed.

  A binary power generation system according to another aspect of the present invention is a water heating heat medium line for heating water, and is provided on a downstream side of the first flow path through which the heat medium passes and the first flow path. And a water heating heat medium line including a second flow path through which the heat medium passes, a first flow path and a second flow path are provided, and water is stored, and water is exchanged by heat exchange between the heat medium and water. A hot water tank for heating, a heating medium connected to the downstream side of the first flow path, through which a heating medium passes, a heating medium line for power generation for performing binary power generation, a heating medium line for power generation, and a heating medium The heat medium passes through the binary power generation apparatus that evaporates the working medium by heat exchange with the internal working medium and generates power using the evaporated working medium, and only the first flow path, or the first flow path and the second flow path. The flow path of the heat medium in the heat medium line for water heating can be switched Comprising a switching means, a second flow path is connected downstream of the generator for the heating medium line.

  According to this binary power generation system, the hot water tank is provided with the first flow path and the second flow path through which the heat medium passes. Since the flow of the heat medium in the heat medium line for water heating is switched so that the heat medium passes through only the first flow path or the first flow path and the second flow path by the switching means, it is obtained in the hot water tank. Heating according to the amount of heat generated is possible. That is, the second channel is a channel for controlling the heating amount. When the amount of heat required in the hot water tank is relatively small, the flow path is switched by the switching means, and the heat medium can flow only in the first flow path. And when the calorie | heat amount calculated | required in a hot water tank increases, a flow path is switched by the switching means, and a heat medium can also flow into a 2nd flow path. Since the second flow path is connected to the downstream side of the power generation heat medium line, even if a cold heat medium stays in the second flow path, the cold heat medium is transferred to the binary power generator. It does not flow in but only flows into the hot water tank. Therefore, it is possible to suppress an adverse effect on the binary power generator when the flow path is switched.

  According to some aspects of the present invention, when a plurality of heat medium lines for heating water is provided, it is possible to suppress an adverse effect on the binary power generator when the flow path is switched.

It is a figure showing a schematic structure of a binary power generation system concerning one embodiment of the present invention. It is a figure which shows schematic structure of the binary electric power generation system which concerns on other embodiment. It is a figure which shows schematic structure of the binary electric power generation system which concerns on other embodiment. It is a figure which shows schematic structure of the binary electric power generation system which concerns on other embodiment. It is a figure which shows schematic structure of the binary electric power generation system which concerns on other embodiment. It is a figure which shows schematic structure of the binary electric power generation system which concerns on the reference form of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

  A binary power generation system 1 according to an embodiment will be described with reference to FIG. As shown in FIG. 1, the binary power generation system 1 is a system that heats water using a heat medium heated by, for example, an exhaust gas boiler, and further generates power. The binary power generation system 1 includes a warm water tank 2 that stores warm water obtained by heating water, and a binary power generation device 3 that is arranged at the rear stage of the warm water tank 2 and performs binary power generation by heat exchange with a heat medium. Here, “the latter stage” is based on the order in which the heat of the heat medium is used.

  As the heat medium, for example, warm water or steam can be used. In this case, the exhaust gas boiler generates warm water or steam. The heat source of the binary power generation system 1 is not limited to the exhaust gas boiler. A fluid other than water may be used as the heat medium.

  The binary power generation system 1 includes a water heating heat medium line for heating the water in the hot water tank 2. A heat medium sent from a heat source such as an exhaust gas boiler passes through the water heating heat medium line. The binary power generation system 1 is provided on the downstream side of the water heating heat medium line and includes a power generation heat medium line L4 for performing binary power generation. The heat medium after being used for heating water in the hot water tank 2 passes through the power generation heat medium line L4. “Line” means a pipe through which a fluid flows.

  The heat medium line for water heating includes a first flow path L1 and a second flow path L2 branched from the first flow path L1. A part of the first flow path L1 and a part of the second flow path L2 are provided in the hot water tank 2. That is, a part of the first flow path L1 passes through the hot water tank 2 and includes a heat exchange part L1a disposed in the hot water tank 2. A part of the second flow path L2 passes through the hot water tank 2 and includes a heat exchange part L2a arranged in the hot water tank 2. Water is heated through the heat exchange part L1a and the heat exchange part L2a.

  Arrangement | positioning of the heat exchange part L1a and the heat exchange part L2a in the warm water tank 2 can be set arbitrarily. For example, in the vertically long hot water tank 2, the heat exchanging part L1a may be arranged at the upper part and the heat exchanging part L2a may be arranged at the lower part, or vice versa. The heat exchange part L1a and the heat exchange part L2a may be arranged at the same height.

  The second flow path L2 is branched from the first flow path L1 at a branch point 7 located on the downstream side of the heat exchange unit L1a and located outside the hot water tank 2, for example. Further, the second flow path L2 is downstream of the branch point 7 and merges with the first flow path L1, for example, at a merge point 8 located outside the hot water tank 2. In other words, in the first flow path L1, the flow path portion between the branch point 7 and the junction 8 bypasses the heat exchange part L2a. The diameter of the second flow path L2 may be the same as the diameter of the first flow path L1, or may be smaller than the diameter of the first flow path L1.

  A valve 11 is provided in the second flow path L2 between the branch point 7 and the heat exchange part L2a. A valve 12 is provided between the branch point 7 and the junction 8 in the first flow path L1. These valves 11 and 12 are automatic valves including an actuator or the like, for example. When the valve 11 and the valve 12 are opened and closed, the heat medium in the heat medium line for water heating passes through only the first flow path L1 or the heat medium passes through the first flow path L1 and the second flow path L2. The flow path is switched. The valve 11 and the valve 12 correspond to switching means that can switch the flow path of the heat medium.

  More specifically, when the valve 11 is closed and the valve 12 is opened, the heat medium flows only in the first flow path L1. In this case, the heat exchange amount (that is, the heating amount) from the heat medium to the hot water in the hot water tank 2 corresponds to the heat exchange amount in the heat exchange unit L1a. On the other hand, when the valve 11 is opened and the valve 12 is closed, the heat medium flows through both the first flow path L1 and the second flow path L2. The amount of heat exchange from the heat medium to the hot water in the hot water tank 2 (that is, the amount of heating) corresponds to the amount of heat exchange in the heat exchange unit L1a and the heat exchange unit L2a. The first channel L1 is a heating channel that is always used. The 2nd flow path L2 is a flow path for heating amount control used as needed.

  The binary power generation system 1 includes a controller 10 that controls the valve 11, the valve 12, and the like. The controller 10 is a computer composed of hardware such as a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory), and software such as a program stored in the ROM. . For example, the controller 10 acquires a temperature output from a thermometer of hot water provided in the hot water tank 2 and controls opening and closing of the valve 11 and the valve 12 based on the temperature.

  The controller 10 acquires the temperature output from the inflow thermometer of the heat medium provided in the first flow path L1, and switches and controls the flow path of the working medium in the binary power generator 3 based on the temperature. May be. For example, the controller 10 may perform control to cause the binary power generation device 3 to generate power when the inflow temperature of the heat medium is equal to or higher than a predetermined value. Moreover, the controller 10 acquires the water level output, for example from the water level gauge provided in the hot water tank 2, and based on the water level, inflow of the supplementary water with respect to the hot water tank 2, and discharge | emission of warm water (water supply to a user) May be controlled. The inflow of makeup water to the hot water tank 2 may be performed using a ball tap or the like, for example.

  For example, the controller 10 controls the opening and closing of the valve 11 and the valve 12 so that the temperature of the hot water in the hot water tank 2 becomes substantially constant. For example, the controller 10 performs control to open the valve 11 and close the valve 12 when the temperature of the hot water is equal to or lower than a predetermined first threshold value. Thereby, a heat medium flows into both the 1st flow path L1 and the 2nd flow path L2, and the heat exchange amount in the heat medium line for water heating increases. For example, the controller 10 performs control to close the valve 11 and open the valve 12 when the temperature of the hot water is equal to or higher than a predetermined second threshold value. Thereby, a heat carrier flows only into the 1st channel L1, and the amount of heat exchange in a heat carrier line for water heating decreases. The second threshold value may be the same value as the first threshold value, or may be a value higher than the first threshold value.

  Between the junction 8 of the 2nd flow path L2 with respect to the 1st flow path L1, and the heat generating medium line L4, the intermediate heat medium line L3 which connects these is provided.

  The binary power generation device 3 is configured to generate power using a heat medium as a heat source. The binary power generation device 3 is a power generation device capable of generating power with an output of about 100 kW, for example. The binary power generation device 3 is a device that employs, for example, an organic rankine cycle (ORC). The binary power generation device 3 is provided with a part of the power generation heat medium line L4. The binary power generator 3 includes an evaporator and a condenser (both not shown). The heat exchanger L4a of the power generation heat medium line L4 passes through the evaporator. The binary power generation device 3 includes a circulation path for the working medium passing through the evaporator, the turbine, and the condenser. In the evaporator, heat exchange between the heat medium and the working medium is performed. The binary power generation device 3 includes a turbine and a generator that are rotated by a working medium heated and evaporated in an evaporator, and generates power by the rotation of the turbine. A cooling tower or the like (not shown) is connected to the binary power generator 3. The cooling water cooled by the cooling tower condenses the working medium in the condenser. The working medium used for the binary power generator 3 is, for example, an inert gas.

  The binary power generation system 1 of the present embodiment is configured to generate a heat generating heat medium line when the flow path of the heat medium is switched so that the heat medium passes through the first flow path L1 and the second flow path L2 by the valves 11 and 12. There is provided a temperature decrease suppressing means for suppressing a decrease in the temperature of the heat medium flowing into the binary power generation device 3 through L4.

  More specifically, the binary power generation system 1 includes a buffer tank (temperature drop) provided between the intermediate heat medium line L3 and the power generation heat medium line L4, that is, between the junction 8 and the power generation heat medium line L4. Suppression means) 6 is provided. The buffer tank 6 is a tank capable of storing a certain amount of heat medium. The buffer tank 6 receives and temporarily stores the heat medium flowing through the first flow path L1 and the second flow path L2, and discharges it to the power generation heat medium line L4. The capacity of the buffer tank 6 can be appropriately set according to the size of the second flow path L2.

  According to the buffer tank 6 provided between the intermediate heat medium line L3 and the power generation heat medium line L4, even when a cold heat medium flows in temporarily, the heat medium is separated from the heat medium in the buffer tank 6. By mixing, a temperature buffering effect is obtained. The buffer tank 6 can hold a certain amount of heat that the heat medium originally has. The buffer tank 6 suppresses a decrease in the temperature of the heat medium flowing into the binary power generation device 3 through the power generation heat medium line L4 using the heat of the heat medium without requiring a separate heat source or the like.

  According to the binary power generation system 1 of the present embodiment, the hot water tank 2 is provided with the first flow path L1 and the second flow path L2 through which the heat medium passes. Since the flow path of the heat medium is switched by the valve 11 and the valve 12 so that the heat medium passes only through the first flow path L1 or through the first flow path L1 and the second flow path L2, it is obtained in the hot water tank 2. Heating according to the amount of heat generated is possible. When the amount of heat required in the hot water tank 2 is relatively small, the flow path is switched by the valve 11 and the valve 12, and the heat medium flows only in the first flow path L1. When the amount of heat required in the hot water tank 2 increases, the flow path is switched by the valve 11 and the valve 12, and the heat medium also flows through the second flow path L2. At this time, the buffer tank 6 suppresses a decrease in the temperature of the heat medium flowing into the binary power generation device 3 through the power generation heat medium line L4. Therefore, it is possible to suppress an adverse effect on the binary power generation device 3 when the flow path is switched.

  More specifically, even when a cold heat medium stays in the second flow path L2, the temperature buffering action is obtained by the heat medium stored in the buffer tank 6. As a result, a decrease in the temperature of the heat medium flowing into the binary power generation device 3 through the power generation heat medium line L4 is suppressed. As a result, the devices inside the binary power generator 3 are protected. For example, a situation in which a turbine (bearing or the like) fails due to a sudden decrease in the temperature of the heat medium flowing into the binary power generation device 3 is avoided.

  According to the configuration that uses the heat of the heat medium to suppress a decrease in the temperature of the heat medium, such as the buffer tank 6, there is no need to use a separate heat source, and the energy efficiency of the entire system is excellent.

  Various embodiments other than the binary power generation system 1 described above can be adopted. As shown in FIG. 2, another embodiment may be a binary power generation system 1 </ b> A including a heat storage body (temperature decrease suppressing unit) 13 provided in the intermediate heat medium line L <b> 3. In the binary power generation system 1 </ b> A, a heat exchange unit 13 a that is a part of the intermediate heat medium line L <b> 3 is disposed inside the heat storage body 13. By arranging the heat storage body 13 around the heat exchanging portion 13 a, heat exchange is performed between the heat medium and the heat storage body 13. The heat storage body 13 includes a container and a heat storage material filled in the container. A material having a large specific heat can be used as the heat storage material. A heat storage material having a certain thermal conductivity is desirable. The heat storage material may be, for example, an organic medium material or a molten salt material.

  The heat accumulator 13 can hold a certain amount of heat that the heat medium originally has. The heat storage body 13 suppresses a decrease in the temperature of the heat medium flowing into the binary power generation device 3 through the power generation heat medium line L4 using the heat of the heat medium without requiring a separate heat source or the like.

  According to the binary power generation system 1 </ b> A, heat is stored in the heat storage body 13 in advance. Even when a cold heat medium stays in the second flow path L2, the heat medium flowing from the second flow path L2 is heated by heat exchange between the heat storage body 13 and the heat medium. As a result, a decrease in the temperature of the heat medium flowing into the binary power generation device 3 through the power generation heat medium line L4 is suppressed.

  As shown in FIG. 3, another embodiment may be a binary power generation system 1 </ b> B including a heat exchanger (temperature decrease suppressing unit) 14 through which a plurality of portions of the intermediate heat medium line L <b> 3 passes. In the binary power generation system 1B, the upstream heat exchange unit 14a and the downstream heat exchange unit 14b, which are part of the intermediate heat medium line L3, pass through the heat exchanger 14. The upstream heat exchange unit 14a and the downstream heat exchange unit 14b exchange heat between the heat media. The heat exchanger 14 may be a countercurrent type or a cocurrent type.

  The heat exchanger 14 suppresses a decrease in the temperature of the heat medium flowing into the binary power generation device 3 through the power generation heat medium line L4 using the heat of the heat medium without requiring a separate heat source or the like. According to the binary power generation system 1B, even when a cold heat medium stays in the second flow path L2, the heat flowing from the second flow path L2 due to heat exchange between the heat media in the heat exchanger 14 is achieved. The medium is heated. As a result, a decrease in the temperature of the heat medium flowing into the binary power generation device 3 through the power generation heat medium line L4 is suppressed.

  As illustrated in FIG. 4, another embodiment may be a binary power generation system 1C including a bypass line L9 connected between the first flow path L1 and the second flow path L2. In the binary power generation system 1C, the bypass line L9 is connected so as to bypass the valve 11 and the valve 12. The upstream end 17 of the bypass line L9 is connected to the upstream side of the branch point 7 in the first flow path L1, and the downstream end 18 of the bypass line L9 is connected to the downstream side of the valve 11 in the second flow path L2. . The bypass line L9 can flow the heat medium to the second flow path L2 regardless of the switching state of the flow path of the heat medium by the valve 11 and the valve 12.

  The pipe diameter of the bypass line L9 is smaller than the pipe diameter of the first flow path L1, and smaller than the pipe diameter of the second flow path L2. The bypass line L9 is a fine channel compared to the first channel L1 and the second channel L2. The resistance in the bypass line L9 is larger than the resistance in the first flow path L1 and larger than the resistance in the second flow path L2. Accordingly, the flow rate of the heat medium in the bypass line L9 is smaller than the flow rate of the heat medium in the first flow path L1 and smaller than the flow rate of the heat medium in the second flow path L2. A manual or automatic valve 16 may be provided in the bypass line L9. The valve 16 is always opened with a predetermined opening.

  The bypass line L9 suppresses a decrease in the temperature of the heat medium flowing into the binary power generation device 3 through the power generation heat medium line L4 using the heat of the heat medium without requiring a separate heat source or the like. According to the binary power generation system 1C, even when the flow path of the heat medium is only the first flow path L1 by the valve 11 and the valve 12, a small amount of heat medium flows through the second flow path L2 through the bypass line L9. It is. That is, while the valve 11 is closed, the heat medium in the second flow path L2 does not stand still. Therefore, even when the second flow path L2 is not used for heating in the hot water tank 2, the temperature of the heat medium in the second flow path L2 is prevented from excessively decreasing. Thereby, at the time of switching of a flow path, the fall of the temperature of the heat medium which flows into the binary power generator 3 through the heat generating heat medium line L4 is suppressed.

  In addition, it is not restricted to the structure which makes the piping diameter of the bypass line L9 small, You may provide some resistance in the bypass line L9. For example, the resistance may be provided by slightly opening the valve 16 described above. Instead of the valve 16, an orifice plate or a capillary tube may be provided in the bypass line L9.

  As shown in FIG. 5, in another embodiment, the power generation heat medium line L4 is connected to the downstream side of the first flow path L1, and the second flow path L2 is connected to the downstream side of the power generation heat medium line L4. It may be a connected binary power generation system 1D. A bypass line L20 that bypasses the heat exchanging portion L2a is provided on the downstream side of the binary power generation device 3 in the power generation heat medium line L4. The upstream end 21 of the bypass line L20 is connected to the downstream side of the binary power generation device 3 in the heat generating medium line L4, and the downstream end 22 of the bypass line L20 is connected to the downstream side of the heat exchange part L2a in the second flow path L2. Connected. The valve 11 is provided between the upstream end 21 and the heat exchange part L2a, and the valve 12 is provided in the bypass line L20.

  According to the binary power generation system 1D, since the second flow path L2 is connected to the downstream side of the power generation heat medium line L4, a cold heat medium is retained in the second flow path L2. However, the cold heat medium does not flow into the binary power generator 3 but only flows into the hot water tank 2. Therefore, it is possible to suppress an adverse effect on the binary power generation device 3 when the flow path is switched.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment. For example, the switching unit is not limited to the configuration including the valve 11 and the valve 12. A three-way valve may be used. Other known switching means that can switch the flow path may be used.

  The temperature decrease suppressing means is not limited to the case where only the heat of the heat medium is used. A heating means such as a heater may be separately provided as the temperature decrease suppressing means.

DESCRIPTION OF SYMBOLS 1 Binary electric power generation system 1A, 1B, 1C, 1D Binary electric power generation system 2 Hot water tank 3 Binary electric power generation apparatus 6 Buffer tank (temperature fall suppression means)
7 Branch point 8 Junction point 10 Controller 11 Valve (switching means)
12 Valve (switching means)
13 Heat storage body (temperature drop suppression means)
14 Heat exchanger (temperature drop suppression means)
L1 First flow path L2 Second flow path L3 Intermediate heat medium line L4 Power generation heat medium line L9 Bypass line

Claims (7)

A water heating heat medium line for heating water, the first flow path through which the heat medium passes, and the first flow path branched from the first flow path and joined to the first flow path downstream from the branch point A heating medium line for water heating including a second flow path,
A hot water tank that is provided with the first flow path and the second flow path, stores the water, and heats the water by heat exchange between the heat medium and the water;
A power generation heat medium line for performing binary power generation, connected to the downstream side of the confluence of the second flow path with respect to the first flow path, and passing through the heat medium;
A binary power generator that is provided with the heat generating medium line for power generation, evaporates the working medium by heat exchange between the heat medium and an internal working medium, and generates power with the evaporated working medium;
Switching means capable of switching the flow path of the heat medium in the heat medium line for water heating so that the heat medium passes through only the first flow path or through the first flow path and the second flow path. ,
Provided between the first flow path and the second flow path, or between the junction and the heat generating medium line for power generation, and the switching means causes the first flow path and the second flow path to be When the flow path of the heat medium is switched so that the heat medium passes, a temperature decrease suppression unit that suppresses a decrease in the temperature of the heat medium flowing into the binary power generation device through the power generation heat medium line;
A binary power generation system.   The binary power generation system according to claim 1, wherein the temperature decrease suppression unit suppresses a decrease in the temperature of the heat medium using heat of the heat medium.   3. The binary power generation system according to claim 2, wherein the temperature decrease suppression unit includes a buffer tank provided between the junction and the power generation heat medium line and storing a certain amount of the heat medium.   The temperature decrease suppression means includes a heat storage body that is disposed around an intermediate heat medium line that connects the junction and the power generation heat medium line and performs heat exchange with the heat medium. Item 3. The binary power generation system according to item 2.   The temperature drop suppression means includes a heat exchanger that passes through a plurality of portions of the intermediate heat medium line that connects the junction and the power generation heat medium line, and performs heat exchange between the heat mediums. The binary power generation system according to claim 2, comprising:   The temperature drop suppression means is connected between the first flow path and the second flow path so as to bypass the switching means, and the temperature reduction suppression means regardless of the switching state of the flow path of the heat medium by the switching means. A bypass line through which the heat medium can flow to the second flow path; and the flow rate of the heat medium in the bypass line is smaller than the flow rate of the heat medium in any of the first flow path and the second flow path. The binary power generation system according to claim 2. A water heating heat medium line for heating water, the first flow path through which the heat medium passes, the second flow path that is provided on the downstream side of the first flow path and through which the heat medium passes, Including a heat medium line for water heating,
A hot water tank that is provided with the first flow path and the second flow path, stores the water, and heats the water by heat exchange between the heat medium and the water;
A heating medium line for power generation for connecting to the downstream side of the first flow path and passing through the heating medium to perform binary power generation;
A binary power generator that is provided with the heat generating medium line for power generation, evaporates the working medium by heat exchange between the heat medium and an internal working medium, and generates power with the evaporated working medium;
Switching means capable of switching the flow path of the heat medium in the heat medium line for water heating so that the heat medium passes through only the first flow path or through the first flow path and the second flow path. With
The second flow path is a binary power generation system connected to the downstream side of the power generation heat medium line.

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