JP4495536B2 - Rankine cycle power generator - Google Patents

Rankine cycle power generator Download PDF

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Publication number
JP4495536B2
JP4495536B2 JP2004215349A JP2004215349A JP4495536B2 JP 4495536 B2 JP4495536 B2 JP 4495536B2 JP 2004215349 A JP2004215349 A JP 2004215349A JP 2004215349 A JP2004215349 A JP 2004215349A JP 4495536 B2 JP4495536 B2 JP 4495536B2
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heat medium
temperature
evaporator
working fluid
condenser
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JP2006037760A (en
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秀雄 加島
靖明 狩野
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サンデン株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/16Energy recuperation from low temperature heat sources of the ICE to produce additional power
    • Y02T10/166Waste heat recovering cycles or thermoelectric systems

Description

  The present invention relates to a Rankine cycle power generation device that uses, for example, heat generated in nature such as sunlight or waste heat of an internal combustion engine as a heat source.

Conventionally, as a power generator using a Rankine cycle, an evaporator that exchanges heat with a predetermined high-temperature side heat medium to evaporate the working fluid, and first heat medium circulation means that circulates the high-temperature side heat medium to the evaporator, A power generator that generates power by the expansion of the working fluid evaporated by the evaporator, a condenser that condenses the working fluid flowing out of the power generator by exchanging heat with a predetermined low-temperature heat medium, and a low-temperature heat medium A second heat medium circulating means for circulating the gas to the condenser, and a pump for sucking the working fluid flowing out of the condenser and discharging it to the evaporator side, and driving the generator by a power generator Is known (for example, see Patent Document 1).
JP 58-183803 A

  However, when the temperature of the evaporator is low, such as when a long time has passed since the end of the previous operation, the working fluid can be sufficiently evaporated by the evaporator at the start of the operation of the power generator. However, when the pump is operated in this state, there is a problem in that the working fluid in the liquid state flows into the power generator and the efficiency of the power generator is reduced. In addition, when the temperature of the condenser is high, such as when the operation is restarted in a relatively short time from the end of the previous operation, the working fluid cannot be sufficiently condensed by the condenser, and if the pump is operated in this state There is a problem that the working fluid in a gas state flows into the pump, resulting in pump discharge failure.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a Rankine cycle power generation device that can always start operation efficiently regardless of the elapsed time from the end of the previous operation. There is to do.

In order to achieve the above object, the present invention provides an evaporator that exchanges heat with a predetermined high-temperature side heat medium to evaporate the working fluid, first heat medium circulation means for circulating the high-temperature side heat medium to the evaporator, A power generator that generates power by expansion of the working fluid evaporated by the evaporator, a condenser that condenses the working fluid flowing out of the power generator by heat exchange with a predetermined low-temperature heat medium, and a low-temperature heat medium. A Rankine cycle comprising a second heat medium circulating means for flowing through the condenser and a pump for sucking the working fluid flowing out from the condenser and discharging it to the evaporator side, and driving the generator by a power generator In the power generation device, a first temperature detecting means for detecting the temperature of the high temperature side heat medium flowing out from the evaporator, a second temperature detecting means for detecting the temperature of the low temperature side heat medium flowing out from the condenser, 1 Heat medium distribution means Thus by circulating a high-temperature-side heat medium to the evaporator, after circulating the low-temperature heat medium to the condenser by a second heat medium circulation means, the temperature detected by the first temperature detecting means becomes higher than a predetermined temperature, and And a control means for starting the operation of the pump when the temperature detected by the second temperature detecting means is equal to or lower than a predetermined temperature.

  Thereby, after the heat medium flows through the evaporator and the condenser, the temperature of the high temperature side heat medium flowing out from the evaporator becomes equal to or higher than a predetermined temperature, and the temperature of the low temperature side heat medium flowing out from the condenser becomes equal to or lower than a predetermined value. Since the pump starts, when the pump starts, the temperature of the evaporator can be raised to a temperature at which the working fluid can sufficiently evaporate, and the temperature of the condenser is sufficiently condensed by the working fluid. It becomes possible to reduce to a possible temperature.

  In order to achieve the above object, the present invention provides an evaporator for exchanging heat by exchanging a working fluid with a predetermined high temperature side heat medium, and first heat medium circulation means for circulating the high temperature side heat medium to the evaporator. A power generator that generates power by expansion of the working fluid evaporated by the evaporator, a condenser that condenses the working fluid that has flowed out of the power generator by exchanging heat with a predetermined low-temperature heat medium, and low-temperature heat A second heat medium circulating means for circulating the medium to the condenser and a pump for sucking the working fluid flowing out from the condenser and discharging it to the evaporator side are driven by the power generator. In the Rankine cycle power generation device, first temperature detection means for detecting the temperature of the high-temperature side heat medium flowing out from the evaporator, and second temperature detection means for detecting the temperature of the low-temperature side heat medium flowing out from the condenser; , First and second Based on the temperature detected by the temperature detecting means, the time until the start of the pump operation is set, the high temperature side heat medium is circulated to the evaporator by the first heat medium circulation means, and the low temperature side heat is circulated by the second heat medium circulation means Control means for starting the operation of the pump when the set time elapses after the medium is circulated through the condenser.

  Thus, after the heat medium flows through the evaporator and the condenser, when the time set based on the temperature of the heat medium elapses, the operation of the pump starts. Can be raised to a temperature at which the working fluid can sufficiently evaporate, and the temperature of the condenser can be lowered to a temperature at which the working fluid can be sufficiently condensed.

  In order to achieve the above object, the present invention provides an evaporator for exchanging heat by exchanging a working fluid with a predetermined high temperature side heat medium, and first heat medium circulation means for circulating the high temperature side heat medium to the evaporator. A power generator that generates power by expansion of the working fluid evaporated by the evaporator, a condenser that condenses the working fluid that has flowed out of the power generator by exchanging heat with a predetermined low-temperature heat medium, and low-temperature heat A second heat medium circulating means for circulating the medium to the condenser and a pump for sucking the working fluid flowing out from the condenser and discharging it to the evaporator side are driven by the power generator. In the Rankine cycle power generation device, the temperature detection means for detecting the ambient temperature of the evaporator and the condenser, and the time until the start of operation of the pump is set based on the detected temperature of the temperature detection means, and the first heat medium flow By means Control means for starting the operation of the pump when the set time has elapsed after the warm-side heat medium is circulated through the evaporator and the low-temperature-side heat medium is circulated through the condenser by the second heat medium circulation means. ing.

  Thus, after the heat medium has passed through the evaporator and the condenser, when the time set based on the temperature around the evaporator and the condenser has elapsed, the pump starts to operate. The temperature of the evaporator can be raised to a temperature at which the working fluid can be sufficiently evaporated, and the temperature of the condenser can be lowered to a temperature at which the working fluid can be sufficiently condensed.

In order to achieve the above object, the present invention provides an evaporator for exchanging heat by exchanging a working fluid with a predetermined high temperature side heat medium, and first heat medium circulation means for circulating the high temperature side heat medium to the evaporator. A power generator that generates power by expansion of the working fluid evaporated by the evaporator, a condenser that condenses the working fluid that has flowed out of the power generator by exchanging heat with a predetermined low-temperature heat medium, and low-temperature heat A second heat medium circulating means for circulating the medium to the condenser and a pump for sucking the working fluid flowing out from the condenser and discharging it to the evaporator side are driven by the power generator. In the Rankine cycle power generation device, the high temperature side heat medium is circulated to the evaporator by the first heat medium circulation means, and the low temperature side heat medium is circulated to the condenser by the second heat medium circulation means. After a predetermined time Then, a control means for starting the operation of the pump, while to the start of operation of the pump, the evaporator and the flow rate of the heat medium to the condenser first and as each becomes smaller flow rate than the predetermined flow rate Control means for controlling the second heat medium flow means .

  As a result, after the heat medium has passed through the evaporator and the condenser, the pump starts operating after a predetermined time has passed. Therefore, at the start of the pump operation, the temperature of the evaporator is sufficiently high. The temperature of the condenser can be raised to a temperature at which the working fluid can be evaporated, and the temperature of the condenser can be lowered to a temperature at which the working fluid can be sufficiently condensed.

  According to the present invention, at the start of pump operation, the temperature of the evaporator can be increased to a temperature at which the working fluid can be sufficiently evaporated, and the temperature of the condenser can be increased to a temperature at which the working fluid can be sufficiently condensed. When starting the pump operation, liquid working fluid does not flow into the power generator or gaseous working fluid does not flow into the pump. The operation can always be started efficiently regardless of the elapsed time from the end.

  FIGS. 1 to 3 show a first embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a Rankine cycle power generation device, and FIGS. 2 and 3 are flowcharts showing the operation of a control unit.

  This Rankine cycle power generation device includes an evaporator 1 that evaporates a working fluid with a high-temperature side heat medium, a turbine 2 that is rotated by the working fluid evaporated by the evaporator 1, and a working fluid that flows out of the turbine 2. A condenser 3 for condensing with the low temperature side heat medium, a main pump 4 for sucking the working fluid flowing out from the condenser 3 and discharging it to the evaporator 1 side, and a controller 5 for controlling the flow rates of the heat medium and the working fluid; And the generator G is driven by the turbine 2.

  The evaporator 1 heats and evaporates the working fluid flowing through the inside by heat exchange with an external high temperature side heat medium (water, brine, etc.), and the high temperature side heat medium is a predetermined heat source (not shown). (E.g. boiler). That is, the evaporator 1 is connected to a heat medium circuit 1a that constitutes a first heat medium flow means, and a first temperature sensor 6 that detects the temperature of the heat medium is provided on the outflow side circuit. Further, the heat medium circuit 1a is provided with a first heat medium pump 7, and the first heat medium pump 7 changes the rotational speed of a drive motor (not shown) to thereby obtain a predetermined first flow rate and second flow rate. It can be switched to. In this case, the first flow rate is set to a smaller flow rate than the second flow rate.

  In the turbine 2, the working fluid inflow side is connected to the evaporator 1 side, and its rotating shaft is connected to the generator G.

  The condenser 3 cools and condenses the working fluid flowing through the inside by heat exchange with an external low-temperature side heat medium (water, brine, etc.), and the low-temperature side heat medium is supplied from a heat source (not shown). Is done. That is, the condenser 3 is connected with a heat medium circuit 3a that constitutes a second heat medium circulation means, and a second temperature sensor 8 that detects the temperature of the heat medium is provided in the outflow side circuit. In addition, as a heat source for the low-temperature side heat medium, water supply, groundwater, seawater, floor heating system, etc. are used. When used, it is possible to use the heat of condensation of the working fluid as a heat source for other equipment, such as heating the brine circulating to the floor heating panel with the condenser 3. Further, the heat medium circuit 3a is provided with a second heat medium pump 9, and the second heat medium pump 9 changes the rotational speed of a drive motor (not shown) to obtain a predetermined first flow rate and second flow rate. It can be switched to. In this case, the first flow rate is set to a smaller flow rate than the second flow rate.

  The main pump 4 is a well-known device that can adjust the flow rate by controlling the rotation speed of the motor 4 a with the inverter 4 b, and is provided between the evaporator 1 and the condenser 3. That is, the main pump 4 can be switched between a predetermined first flow rate and a second flow rate by controlling the rotation speed of the motor 4a by the inverter 4b. In this case, the second flow rate is set to a larger flow rate than the first flow rate.

  The control unit 5 is constituted by a microcomputer, and is connected to the inverter 4 b of the main pump 4, the first temperature sensor 6, the first heat medium pump 7, the second temperature sensor 8, and the second heat medium pump 9. Yes. Further, the control unit 5 includes a third temperature sensor 10 that detects the temperature of the working fluid that flows into the evaporator 1, a pressure sensor 11 that detects the pressure of the working fluid that flows into the evaporator 1, and a generator G Are respectively connected to the voltage detectors 12 for detecting the output voltages of the two.

  In the Rankine cycle power generation apparatus configured as described above, the working fluid heated and evaporated by the evaporator 1 flows into the turbine 2 and expands in the turbine 2. Thereby, the turbine 2 is rotated by the expansion of the working fluid, and the generator G is driven by the turbine 2. Next, the working fluid flowing out of the turbine 2 flows into the condenser 3 and is condensed by heat exchange with the low-temperature side heat medium of the condenser 3. Then, the liquid working fluid that has flowed out of the condenser 3 is sucked into the main pump 4 and discharged to the evaporator 1 side, and is evaporated again by the evaporator 1.

  Next, the operation of the control unit 5 will be described with reference to the flowcharts of FIGS. Note that the flowcharts of FIGS. 2 and 3 continue with the number 1 in the figure.

  First, when an operation start signal is output from the main switch or another control device (S1), the first and second heat medium pumps 7 and 9 are operated at the first flow rates (S2 and S3), respectively. Here, the temperature T1 of the high temperature side heat medium of the evaporator 1 detected by the first temperature sensor 6 becomes equal to or higher than a predetermined reference temperature W1 (S4), and the condenser 3 detected by the second temperature sensor 8 is used. When the temperature T2 of the low-temperature side heat medium becomes equal to or lower than the predetermined reference temperature W2 (S5), the first and second heat medium pumps 7 and 9 are switched to the second flow rates (S6 and S7), respectively, and the main pump 4 Is operated at the first flow rate (S8). Here, after waiting for a predetermined time t1 (S9), when the temperature T3 of the working fluid detected by the third temperature sensor 10 is equal to or lower than a predetermined reference temperature W3 (S10), or by the pressure sensor 11 When the detected pressure P of the working fluid is equal to or lower than the predetermined reference pressure PL (S11), or when the output voltage V of the generator G detected by the voltage detector 12 is equal to or lower than the predetermined reference voltage VL ( S12), the main pump 4 is switched to the second flow rate (S13), otherwise, the flow rate of the main pump 4 is maintained at the first flow rate (S14). Next, after waiting for time t1 (S15), the operations of steps S10 to S16 are repeated until the operation end signal is output (S16). Here, when the operation end signal is output in step S16, the main pump 4 and the first heat medium pump 7 are stopped (S17, S18), and after the time t2 has passed (S19), the second heat The medium pump 9 is stopped (S20).

  Thus, according to the present embodiment, the temperature T1 of the high temperature side heat medium flowing out from the evaporator 1 becomes equal to or higher than the first temperature W1 after the heat medium is circulated through the evaporator 1 and the condenser 3, respectively. Since the operation of the main pump 4 is started after the temperature T2 of the low temperature side heat medium flowing out from the condenser 3 becomes equal to or lower than the second temperature W2, when the operation of the main pump 4 is started, the evaporator 1 Can be raised to a temperature at which the working fluid can be sufficiently evaporated, and the temperature of the condenser 3 can be lowered to a temperature at which the working fluid can be sufficiently condensed. Therefore, when starting the operation of the main pump 4, no liquid working fluid flows into the turbine 2 or no gaseous working fluid flows into the main pump 4. The operation can always be started efficiently regardless of the elapsed time.

  In this case, until the operation of the main pump 4 is started, the flow rate of the heat medium to the evaporator 1 and the condenser 3 is set to the first flow rate that is smaller than the second flow rate. 1 and the condenser 3 and the heat medium have a long thermal contact time, and the difference between the temperature detected by the temperature sensors 6 and 8 and the actual temperature of the evaporator 1 and the condenser 3 is reduced. The accuracy of the detected temperature by 6 and 8 can be improved.

  In addition, since the low temperature side heat medium is circulated through the condenser 3 after the main pump 4 is stopped until the predetermined time t2 elapses, the working fluid in the condenser 3 is in a gaseous state due to the residual heat of the condenser 3. Even if it remains, it can be condensed by heat exchange with the low-temperature side heat medium, and there is an advantage that the working fluid in the gaseous state does not flow into the main pump 4 from the condenser 3 at the start of the next operation.

  Further, when the temperature T3 of the working fluid detected by the third temperature sensor 10 is not more than the predetermined reference temperature W3, or the pressure P of the working fluid detected by the pressure sensor 11 is not more than the predetermined reference pressure PL. Or when the output voltage V of the generator G detected by the voltage detector 12 is equal to or lower than a predetermined reference voltage VL, the main pump 4 is switched to a second flow rate higher than the first flow rate. Therefore, even when the power generation capacity decreases due to insufficient circulation of the working fluid, the power generation capacity can be quickly recovered by increasing the flow rate of the main pump 4, and a stable output voltage can always be obtained. In this case, it is possible to obtain a more stable output voltage by controlling the flow rate of the main pump 4 not to be two steps of the first and second flow rates but to switch to multiple steps by the inverter 4b.

  In addition, when using the well-known turbine 2 as a power generator like the said embodiment, high power can always be obtained, but in the case of a small-scale apparatus, a well-known scroll type expander is used as a power generator. Thus, a small and low-cost device can be realized.

  4 and 5 show a second embodiment of the present invention. FIG. 4 is a schematic configuration diagram of the Rankine cycle power generation device, and FIG. 5 is a flowchart showing a part of the operation of the control unit. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to 1st Embodiment.

  The control unit 13 shown in the figure is constituted by a microcomputer, and as in the first embodiment, the inverter 4b, the first temperature sensor 6, the first heat medium pump 7, and the second temperature sensor 8 of the main pump 4 are arranged. And connected to the second heat medium pump 9. The control unit 13 includes a third temperature sensor 10 that detects the temperature of the working fluid that flows into the evaporator 1, a pressure sensor 11 that detects the pressure of the working fluid that flows into the evaporator 1, and a generator G Are respectively connected to the voltage detectors 12 for detecting the output voltages of the two.

  In the Rankine cycle power generation device of this embodiment, as in the first embodiment, the working fluid is circulated by the main pump 4, whereby the turbine 2 is rotated by the expansion of the working fluid, and the generator G is driven by the turbine 2. Is done.

  Next, the operation of the control unit 13 will be described with reference to the flowchart of FIG. Note that the operation of the control unit 13 of the present embodiment includes operations common to the first embodiment, and therefore only a part of the operation of the control unit 13 will be described.

  First, when an operation start signal is output (S21), the first and second heat medium pumps 7 and 9 are operated at a first flow rate (S22 and S23), respectively. Next, a time t3 until the main pump 4 is operated is set based on the detected temperatures T1 and T2 of the first and second temperature sensors 6 and 8 (S24), and if the set time t3 has passed (S25). ), The first and second heat medium pumps 7 and 9 are respectively switched to the second flow rate (S26, S27), and the main pump 4 is operated at the first flow rate (S28). The subsequent operation is the same as the operation after step S9 in the first embodiment, and a description thereof will be omitted. As a method for setting the set time t3, for example, a time corresponding to each of the detected temperatures T1 and T2 is calculated using a predetermined calculation formula, and the longer time is set as the set time t3. Alternatively, time corresponding to a plurality of reference temperatures may be stored in advance, and the longer time of the reference temperatures corresponding to the detected temperatures T1 and T2 may be set as the set time t3.

  Thus, according to the present embodiment, after the heat medium is circulated through the evaporator 1 and the condenser 3, respectively, after the time t3 set based on the detected temperatures T1 and T2 of the temperature sensors 6 and 8, elapses, Since the operation of the main pump 4 is started, the temperature of the evaporator 1 can be raised to a temperature at which the working fluid can be sufficiently evaporated when the operation of the main pump 4 is started, as in the above-described embodiment. The temperature of the condenser 3 can be lowered to a temperature at which the working fluid can be sufficiently condensed.

  6 and 7 show a third embodiment of the present invention. FIG. 6 is a schematic configuration diagram of the Rankine cycle power generation device, and FIG. 7 is a flowchart showing a part of the operation of the control unit. In the present embodiment, the first and second temperature sensors 6 and 8 of the first embodiment are not provided, and other components equivalent to those of the first embodiment are denoted by the same reference numerals. Show.

  The control unit 14 shown in the figure is configured by a microcomputer, and is connected to the inverter 4b, the first heat medium pump 7 and the second heat medium pump 9 of the main pump 4 as in the first embodiment. The control unit 14 includes a third temperature sensor 10 that detects the temperature of the working fluid that flows into the evaporator 1, a pressure sensor 11 that detects the pressure of the working fluid that flows into the evaporator 1, and a generator G. Are connected to a voltage detector 12 for detecting the output voltage and an outside air temperature sensor 15 for detecting the temperature around the evaporator 1 and the condenser 3 (outside air temperature).

  In the Rankine cycle power generation device of this embodiment, as in the first embodiment, the working fluid is circulated by the main pump 4, whereby the turbine 2 is rotated by the expansion of the working fluid, and the generator G is driven by the turbine 2. Is done.

  Next, the operation of the control unit 14 will be described with reference to the flowchart of FIG. Since the operation of the control unit 14 of the present embodiment includes an operation common to the first embodiment, only a part of the operation of the control unit 14 will be described.

  First, when an operation start signal is output (S29), the first and second heat medium pumps 7 and 9 are operated at a first flow rate (S30 and S31), respectively. Next, the time t3 until the main pump 4 is operated is set based on the detected temperature T4 of the outside air temperature sensor 15 (S32), and if the set time t3 has passed (S33), the first and second heats. The medium pumps 7 and 9 are respectively switched to the second flow rate (S34, S35), and the main pump 4 is operated at the first flow rate (S36). The subsequent operation is the same as the operation after step S9 in the first embodiment, and a description thereof will be omitted. As a method for setting the set time t3, for example, a time corresponding to each of the outside air temperatures T4 is calculated using a predetermined calculation formula and set to the set time t4, or a plurality of reference temperatures are supported in advance. The time for the reference temperature may be stored, and the time for the reference temperature corresponding to the outside air temperature T4 may be set to the set time t3.

  As described above, according to the present embodiment, after passing the heat medium through the evaporator 1 and the condenser 3, respectively, after the time t3 set based on the detected temperature T4 of the outside air temperature sensor 15 has elapsed, the main pump 4 As in the previous embodiment, when the main pump 4 starts to operate, the temperature of the evaporator 1 can be raised to a temperature at which the working fluid can sufficiently evaporate. The temperature of 3 can be lowered to a temperature at which the working fluid can be sufficiently condensed. Further, in this embodiment, since a sensor for detecting the heat medium temperature of the heat medium circuits 1a and 3a is not necessary, the structure can be simplified.

  8 and 9 show a fourth embodiment of the present invention, FIG. 8 is a schematic configuration diagram of the Rankine cycle power generation device, and FIG. 9 is a flowchart showing a part of the operation of the control unit. In the present embodiment, the first and second temperature sensors 6 and 8 of the first embodiment are not provided, and other components equivalent to those of the first embodiment are denoted by the same reference numerals. Show.

  The control unit 16 shown in the figure is constituted by a microcomputer, and is connected to the inverter 4b, the first heat medium pump 7 and the second heat medium pump 9 of the main pump 4 as in the first embodiment. The control unit 16 includes a third temperature sensor 10 that detects the temperature of the working fluid that flows into the evaporator 1, a pressure sensor 11 that detects the pressure of the working fluid that flows into the evaporator 1, and a generator G Are respectively connected to the voltage detectors 12 for detecting the output voltages of the two.

  In the Rankine cycle power generation device of this embodiment, as in the first embodiment, the working fluid is circulated by the main pump 4, whereby the turbine 2 is rotated by the expansion of the working fluid, and the generator G is driven by the turbine 2. Is done.

  Next, the operation of the control unit 16 will be described with reference to the flowchart of FIG. In addition, since the operation of the control unit 16 of the present embodiment includes an operation common to the first embodiment, only a part of the operation of the control unit 16 will be described.

  First, when an operation start signal is output (S37), the first and second heat medium pumps 7 and 9 are operated at the first flow rates (S38 and S39), respectively. Next, when a preset time t3 has elapsed (S40), the first and second heat medium pumps 7 and 9 are switched to the second flow rates (S41 and S42), respectively, and the main pump 4 is switched to the second flow rate. It operates at a flow rate of 1 (S43). The subsequent operation is the same as the operation after step S9 in the first embodiment, and a description thereof will be omitted. If the set time t3 can be arbitrarily changed by a predetermined setting operation, it can always be set to an appropriate time according to the use conditions.

  Thus, according to the present embodiment, the operation of the main pump 4 is started when a preset time t3 has elapsed after the heat medium is circulated through the evaporator 1 and the condenser 3, respectively. As in the previous embodiment, at the start of the operation of the main pump 4, the temperature of the evaporator 1 can be raised to a temperature at which the working fluid can be sufficiently evaporated, and the temperature of the condenser 3 can be sufficiently increased. The temperature can be lowered to a condensable temperature. Further, in this embodiment, since a sensor for detecting the heat medium temperature and the outside air temperature of the heat medium circuits 1a and 3a is not necessary, the structure can be simplified.

1 is a schematic configuration diagram of a Rankine cycle power generation device showing a first embodiment of the present invention. Flow chart showing operation of control unit Flow chart showing operation of control unit Schematic configuration diagram of a Rankine cycle power generation device showing a second embodiment of the present invention Flow chart showing a part of the operation of the control unit Schematic block diagram of Rankine cycle power generator showing a third embodiment of the present invention Flow chart showing a part of the operation of the control unit Schematic block diagram of Rankine cycle power generator showing a fourth embodiment of the present invention Flow chart showing a part of the operation of the control unit

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Evaporator, 1a ... Heat medium circuit, 2 ... Turbine, 3 ... Condenser, 3a ... Heat medium circuit, 4 ... Main pump, 5 ... Control part, 6 ... 1st temperature sensor, 7 ... 1st heat Medium pump, 8 ... second temperature sensor, 9 ... second heat medium pump, 10 ... third temperature sensor, 11 ... pressure sensor, 12 ... voltage detector, 13, 14 ... control unit, 15 ... outside air temperature Sensor, 16 ... control unit.

Claims (9)

  1. An evaporator that evaporates the working fluid by exchanging heat with a predetermined high-temperature side heat medium, first heat medium circulation means that circulates the high-temperature side heat medium to the evaporator, and power generated by expansion of the working fluid evaporated by the evaporator A power generator that generates heat, a condenser that exchanges heat by condensing the working fluid flowing out of the power generator with a predetermined low-temperature side heat medium, and a second heat medium flow that causes the low-temperature side heat medium to flow to the condenser In the Rankine cycle power generation device comprising: a means and a pump that sucks the working fluid flowing out of the condenser and discharges the working fluid to the evaporator side, and the power generator is driven by the power generator,
    First temperature detecting means for detecting the temperature of the high temperature side heat medium flowing out of the evaporator;
    Second temperature detection means for detecting the temperature of the low temperature side heat medium flowing out of the condenser;
    After the high temperature side heat medium is circulated to the evaporator by the first heat medium circulation means and the low temperature side heat medium is circulated to the condenser by the second heat medium circulation means, the detected temperature of the first temperature detection means is A Rankine cycle power generator, comprising: a control unit that starts the operation of the pump when the temperature is equal to or higher than the predetermined temperature and the temperature detected by the second temperature detection unit is equal to or lower than the predetermined temperature.
  2. An evaporator that evaporates the working fluid by exchanging heat with a predetermined high-temperature side heat medium, first heat medium circulation means that circulates the high-temperature side heat medium to the evaporator, and power generated by expansion of the working fluid evaporated by the evaporator A power generator that generates heat, a condenser that exchanges heat by condensing the working fluid flowing out of the power generator with a predetermined low-temperature side heat medium, and a second heat medium flow that causes the low-temperature side heat medium to flow to the condenser In the Rankine cycle power generation device comprising: a means and a pump that sucks the working fluid flowing out of the condenser and discharges the working fluid to the evaporator side, and the power generator is driven by the power generator,
    First temperature detecting means for detecting the temperature of the high temperature side heat medium flowing out of the evaporator;
    Second temperature detection means for detecting the temperature of the low temperature side heat medium flowing out of the condenser;
    Based on the detected temperatures of the first and second temperature detecting means, the time until the pump operation is started is set, the high temperature side heat medium is circulated to the evaporator by the first heat medium circulating means, and the second heat A Rankine cycle power generator comprising: control means for starting the operation of the pump when the set time has elapsed after the low temperature side heat medium is circulated to the condenser by the medium circulation means.
  3. An evaporator that evaporates the working fluid by exchanging heat with a predetermined high-temperature side heat medium, first heat medium circulation means that circulates the high-temperature side heat medium to the evaporator, and power generated by expansion of the working fluid evaporated by the evaporator A power generator that generates heat, a condenser that exchanges heat by condensing the working fluid flowing out of the power generator with a predetermined low-temperature side heat medium, and a second heat medium flow that causes the low-temperature side heat medium to flow to the condenser In the Rankine cycle power generation device comprising: a means and a pump that sucks the working fluid flowing out of the condenser and discharges the working fluid to the evaporator side, and the power generator is driven by the power generator,
    Temperature detecting means for detecting the temperature around the evaporator and the condenser;
    Based on the temperature detected by the temperature detecting means, the time until the start of operation of the pump is set, the high temperature side heat medium is circulated to the evaporator by the first heat medium circulation means, and the low temperature side heat is circulated by the second heat medium circulation means. A Rankine cycle power generation device comprising: a control unit that starts operation of the pump when the set time has elapsed after the medium is circulated through the condenser.
  4. An evaporator that evaporates the working fluid by exchanging heat with a predetermined high-temperature side heat medium, first heat medium circulation means that circulates the high-temperature side heat medium to the evaporator, and power generated by expansion of the working fluid evaporated by the evaporator A power generator that generates heat, a condenser that exchanges heat by condensing the working fluid flowing out of the power generator with a predetermined low-temperature side heat medium, and a second heat medium flow that causes the low-temperature side heat medium to flow to the condenser In the Rankine cycle power generation device comprising: a means and a pump that sucks the working fluid flowing out of the condenser and discharges the working fluid to the evaporator side, and the power generator is driven by the power generator,
    When a predetermined time elapses after the high temperature side heat medium is circulated to the evaporator by the first heat medium circulation means and the low temperature side heat medium is circulated to the condenser by the second heat medium circulation means. A control means for starting the operation of the pump ;
    Control means for controlling the first and second heat medium circulation means so that the flow rate of the heat medium to the evaporator and the condenser is less than a predetermined flow rate until the pump is started. And a Rankine cycle power generator.
  5. Control for controlling the first and second heat medium circulation means so that the flow rate of the heat medium to the evaporator and the condenser is less than a predetermined flow rate until the operation of the pump is started. The Rankine cycle power generator according to claim 1, 2 or 3, further comprising means.
  6. 3. A control means for controlling the second heat medium circulation means so that the low temperature side heat medium flows through the condenser until a predetermined time has elapsed after the pump has stopped. The Rankine cycle power generation device according to 3, 4, or 5.
  7. Third temperature detection means for detecting the temperature of the working fluid flowing into the power generator;
    When the detected temperature of the third temperature detecting means is low, the flow rate of the working fluid to the evaporator is increased, and when the detected temperature of the third temperature detecting means is high, the flow rate of the working fluid to the evaporator is decreased. The Rankine cycle power generator according to claim 1, 2, 3, 4, 5 or 6, further comprising control means for controlling the pump.
  8. Pressure detecting means for detecting the pressure of the working fluid flowing into the power generator;
    Control that controls the pump to increase the flow rate of the working fluid to the evaporator when the detection pressure of the pressure detection unit is low, and to decrease the flow rate of the working fluid to the evaporator when the detection pressure of the pressure detection unit is high The Rankine cycle power generator according to claim 1, 2, 3, 4, 5, 6 or 7, further comprising means.
  9. Voltage detection means for detecting the output voltage of the generator;
    Control that controls the pump to increase the flow rate of the working fluid to the evaporator when the detection voltage of the voltage detection unit is low, and to decrease the flow rate of the working fluid to the evaporator when the detection voltage of the voltage detection unit is high The Rankine cycle power generator according to claim 1, 2, 3, 4, 5, 6, 7 or 8.
JP2004215349A 2004-07-23 2004-07-23 Rankine cycle power generator Expired - Fee Related JP4495536B2 (en)

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Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4684761B2 (en) * 2005-06-27 2011-05-18 株式会社荏原製作所 Power generator
JP4738225B2 (en) * 2006-03-27 2011-08-03 大阪瓦斯株式会社 Power system
JP4823936B2 (en) * 2006-04-19 2011-11-24 株式会社デンソー Waste heat utilization apparatus and control method thereof
JP5001928B2 (en) 2008-10-20 2012-08-15 サンデン株式会社 Waste heat recovery system for internal combustion engines
US9014791B2 (en) 2009-04-17 2015-04-21 Echogen Power Systems, Llc System and method for managing thermal issues in gas turbine engines
US9441504B2 (en) 2009-06-22 2016-09-13 Echogen Power Systems, Llc System and method for managing thermal issues in one or more industrial processes
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US9316404B2 (en) 2009-08-04 2016-04-19 Echogen Power Systems, Llc Heat pump with integral solar collector
US8613195B2 (en) 2009-09-17 2013-12-24 Echogen Power Systems, Llc Heat engine and heat to electricity systems and methods with working fluid mass management control
US8869531B2 (en) 2009-09-17 2014-10-28 Echogen Power Systems, Llc Heat engines with cascade cycles
US8794002B2 (en) 2009-09-17 2014-08-05 Echogen Power Systems Thermal energy conversion method
US8813497B2 (en) 2009-09-17 2014-08-26 Echogen Power Systems, Llc Automated mass management control
US8616001B2 (en) 2010-11-29 2013-12-31 Echogen Power Systems, Llc Driven starter pump and start sequence
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US8857186B2 (en) 2010-11-29 2014-10-14 Echogen Power Systems, L.L.C. Heat engine cycles for high ambient conditions
JP5875253B2 (en) * 2011-05-19 2016-03-02 千代田化工建設株式会社 Combined power generation system
JP5621721B2 (en) * 2011-06-30 2014-11-12 株式会社豊田自動織機 Rankine cycle
US9062898B2 (en) 2011-10-03 2015-06-23 Echogen Power Systems, Llc Carbon dioxide refrigeration cycle
WO2013116861A1 (en) * 2012-02-02 2013-08-08 Electratherm, Inc. Improved heat utilization in orc systems
US9551487B2 (en) 2012-03-06 2017-01-24 Access Energy Llc Heat recovery using radiant heat
WO2014031526A1 (en) 2012-08-20 2014-02-27 Echogen Power Systems, L.L.C. Supercritical working fluid circuit with a turbo pump and a start pump in series configuration
US9118226B2 (en) 2012-10-12 2015-08-25 Echogen Power Systems, Llc Heat engine system with a supercritical working fluid and processes thereof
US9341084B2 (en) 2012-10-12 2016-05-17 Echogen Power Systems, Llc Supercritical carbon dioxide power cycle for waste heat recovery
EP2948649A4 (en) * 2013-01-28 2016-11-16 Echogen Power Systems Llc Process for controlling a power turbine throttle valve during a supercritical carbon dioxide rankine cycle
WO2014117068A1 (en) 2013-01-28 2014-07-31 Echogen Power Systems, L.L.C. Methods for reducing wear on components of a heat engine system at startup
US20140224469A1 (en) * 2013-02-11 2014-08-14 Access Energy Llc Controlling heat source fluid for thermal cycles
JP6194274B2 (en) * 2014-04-04 2017-09-06 株式会社神戸製鋼所 Waste heat recovery system and waste heat recovery method
JP2017025901A (en) * 2015-07-16 2017-02-02 株式会社神戸製鋼所 Thermal energy recovery device and activation method therefor
EP3118425B1 (en) 2015-07-16 2018-05-09 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Thermal energy recovery device and start-up method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58122308A (en) * 1982-01-18 1983-07-21 Mitsui Eng & Shipbuild Co Ltd Method and equipment for heat storage operation of waste heat recovery rankine cycle system
JPS58127106U (en) * 1982-02-23 1983-08-29
JPS58183803A (en) * 1982-04-19 1983-10-27 Mitsubishi Electric Corp Steam generater in rankine cycle engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58122308A (en) * 1982-01-18 1983-07-21 Mitsui Eng & Shipbuild Co Ltd Method and equipment for heat storage operation of waste heat recovery rankine cycle system
JPS58127106U (en) * 1982-02-23 1983-08-29
JPS58183803A (en) * 1982-04-19 1983-10-27 Mitsubishi Electric Corp Steam generater in rankine cycle engine

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