JP2006029125A - Regenerative cycle generating set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a regenerating cycle generating set which materializes sufficient improvement of thermal efficiency corresponding to the increase in manufacturing cost even in a small scale. <P>SOLUTION: The set is equipped with a first heater 5 for heating working fluid flowing out of a condenser 4 by a part of working fluid flowing out of a first turbine 2 and with a second heater 6 for heating working fluid flowing out of the condenser 4 by a part of working fluid flowing out of a second turbine 3. Therefor, heat of working fluid flowing out of the respective turbines 2, 3 can be recovered to a fluid evaporator 1 side not only with the second heater 6 but also with the first heater 5, and thus the ratio of a heat quantity discharged outside with the condenser 4 is significantly reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a regenerative cycle power generation apparatus 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 generation device using a regeneration cycle, a fluid evaporator that heats and evaporates a working fluid with a predetermined heat source, a first turbine that generates power by expansion of the working fluid evaporated by the fluid evaporator, A second turbine generating power by expansion of a part of the working fluid flowing out from the first turbine, a condenser for condensing the working fluid flowing out from the second turbine, and a working fluid flowing out from the condenser A heater that is heated by another part of the working fluid that flows out of the turbine, a first pump that sucks the working fluid that flows out of the condenser and discharges it to the heater side, and a working fluid that flows out of the heater And a second pump for discharging the gas to the fluid evaporator side, and a generator is driven by first and second turbines (see, for example, Patent Document 1). ).

In the case of a relatively small-scale device, a so-called scroll in which a working fluid is introduced between a pair of scroll members and one scroll member is rotated by expansion of the working fluid as a power generator instead of a turbine. One using a mold expander is known (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 7-91361 JP 2001-248539 A

  By the way, in the power generation apparatus using the regeneration cycle as described above, a part of the working fluid that is being expanded is taken out from the first turbine, and the working fluid that is returned to the fluid evaporator by the working fluid is heated to condense. The ratio of the amount of heat that is discarded to the outside by the vessel is reduced, and the thermal efficiency can be improved as compared with the so-called Rankine cycle (simple cycle). However, in the regeneration cycle, since the working fluid that is returned to the fluid evaporator is heated, the manufacturing cost increases. Therefore, the small-scale power generation device cannot improve the thermal efficiency commensurate with the increase in manufacturing cost. There was a problem.

  The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a regenerative cycle power generation apparatus capable of improving the thermal efficiency sufficiently to meet the increase in manufacturing cost even if it is a small scale. There is to do.

  In order to achieve the above object, the present invention provides a fluid evaporator that heats and evaporates a working fluid with a predetermined heat source, and a first power generator that generates power by expansion of the working fluid evaporated by the fluid evaporator, A second power generator for generating power by expansion of a part of the working fluid flowing out from the first power generator, a condenser for condensing the working fluid flowing out from the second power generator, and a condenser A heater that heats the working fluid flowing out from the first power generator with another working fluid flowing out from the first power generator, and a first pump that sucks the working fluid flowing out from the condenser and discharges it to the heater side And a second pump that sucks the working fluid flowing out of the heater and discharges it to the fluid evaporator side, and drives the generator by the first and second power generators. In the condenser And a heater for heating the working fluid flowing out of the working fluid et flowing out from the second power generator.

  Thereby, the working fluid flowing out from the condenser is heated by a part of the working fluid flowing out from the first power generator, and the working fluid flowing out from the condenser flows out from the second power generator. Therefore, not only the heat of the working fluid flowing out from the first power generator, but also the heat of the working fluid flowing out from the second power generator can be recovered on the fluid evaporator side.

  According to the present invention, not only the heat of the working fluid flowing out from the first power generator, but also the heat of the working fluid flowing out from the second power generator can be recovered to the fluid evaporator side. The ratio of the amount of heat thrown away to the outside by the vessel can be greatly reduced, and even with a small scale, sufficient thermal efficiency can be improved to meet the increase in manufacturing cost.

  FIG. 1 shows a first embodiment of the present invention and is a schematic configuration diagram of a regeneration cycle power generation apparatus.

  The regeneration cycle power generation apparatus includes a fluid evaporator 1 that evaporates a predetermined working fluid (for example, isobutane), and a first turbine 2 that functions as a first power generator that is rotated by the working fluid evaporated by the fluid evaporator 1. A second turbine 3 as a second power generator rotating by a part of the working fluid flowing out from the first turbine 2, a condenser 4 for condensing the working fluid flowing out from the second turbine 3, A first heater 5 that heats the working fluid that flows out of the condenser 4 with a part of the working fluid that flows out of the first turbine 2, and a working fluid that flows out of the condenser 4 flows out of the second turbine 3. The second heater 6 heated by the working fluid, the mixer 7 provided on the outflow side of the first heater 5, and the second heater 5 side by sucking the working fluid flowing out from the condenser 4 The first to discharge And a second pump 9 that sucks the working fluid flowing out of the mixer 7 and discharges the working fluid to the fluid evaporator 1 side, and the first and second turbines 2 and 3 perform the first and second pumps. The generators G1 and G2 are each driven.

  The fluid evaporator 1 is a well-known device that heats and evaporates a working fluid with heat collected from sunlight, and a flow rate adjusting valve 1a is provided on the outflow side thereof.

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

  The second turbine 3 is connected to an inflow side circuit that branches the inflow side of the working fluid from the outflow side circuit of the first turbine 2, and a second generator G2 is connected to the rotating shaft thereof.

  The condenser 4 is connected to the outflow side of the second turbine 3, and cools and condenses the working fluid flowing through the inside by heat exchange with an external heat medium.

  The first heater 5 is connected to the outflow side circuit of the first turbine 2 and the outflow side circuit of the first heater 5, and exchanges heat between the working fluids flowing through these circuits so that the first heater 5 The working fluid flowing out of the heater 5 is heated by a part of the working fluid flowing out from the first turbine 2.

  The second heater 6 is connected to the outflow side circuit of the second turbine 3 and the outflow side circuit of the condenser 4, and the working fluid flowing through these circuits exchanges heat with each other, thereby flowing out of the condenser 4. The working fluid to be heated is heated by the working fluid flowing out from the second turbine 3.

  The mixer 7 joins the working fluid that has passed through the first heater 5 from the first turbine 2 side and the working fluid that has passed through the first heater 5 from the second heater 6 side. The inside is formed so that a liquid working fluid can be stored.

  The first pump 8 is a well-known device that can adjust the flow rate by controlling the rotational speed of a drive motor (not shown), and is provided between the condenser 4 and the second heater 6. Yes.

  Similarly to the first pump 10, the second pump 9 is a well-known device capable of adjusting the flow rate by controlling the number of rotations of a drive motor (not shown). The second pump 9 includes a mixer 7 and a fluid evaporator 1. It is provided in between.

  In the regeneration cycle power generation apparatus configured as described above, the working fluid heated and evaporated by the fluid evaporator 1 flows into the first turbine 2 and expands in the first turbine 2. A part of the working fluid flowing out from the first turbine 2 flows into the second turbine 3 and expands in the second turbine 3. As a result, the turbines 2 and 3 are rotated by the expansion of the working fluid, and the generators G1 and G2 are driven by the turbines 2 and 3, respectively. Next, the working fluid flowing out from the second turbine 3 flows through one flow path of the second heater 6 and then condenses by the condenser 4. The working fluid that has flowed out of the condenser 4 is sucked into the first pump 8 and discharged to the second heater 6 side, flows through the other flow path of the second heater 6, and passes through the first heater 5. Flow into. In that case, in the 2nd heater 6, the working fluid which flows in from the condenser 4 side is heated with the working fluid which flows in from the 2nd turbine 3 side. Further, the working fluid on the condenser 4 side flowing out from the second heater 6 flows through the first heater 5 and then flows into the mixer 7. At that time, in the first heater 5, the working fluid flowing in from the second heater 6 side is heated by a part of the working fluid flowing in from the first turbine 2 side, and flows in from the first turbine 2 side. The working fluid thus flowed into the mixer 7. Then, the working fluid flowing out from the mixer 7 is sucked into the second pump 9 and discharged to the fluid evaporator 1 side, and is evaporated again by the fluid evaporator 1.

  Thus, in this embodiment, in addition to the 1st heater 5 which heats the working fluid which flows out of the condenser 4 with the one part working fluid which flows out of the 1st turbine 2, the operation | movement which flows out from the condenser 4 Since the second heater 6 for heating the fluid by the working fluid flowing out from the second turbine 3 is provided, the heat of the working fluid flowing out from each turbine 2, 3 is not limited to the second heater 6. 1 heater 5 can also be recovered to the fluid evaporator 1 side. Thereby, the ratio of the amount of heat thrown away to the outside by the condenser 4 can be greatly reduced, and sufficient thermal efficiency can be improved to meet the increase in manufacturing cost even in a small scale.

  2 and 3 show a second embodiment, FIG. 2 is a schematic configuration diagram of a regeneration cycle power generation device, and FIG. 3 is a temperature-entropy diagram. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.

  The regeneration cycle power generator of the present embodiment heats the first fluid evaporator 10 that evaporates the working fluid flowing into the turbines 2 and 3 and the working fluid that flows from the first turbine 2 into the second turbine 3. The first fluid evaporator 10 is equivalent to the fluid evaporator 1 of the above embodiment.

  The second fluid evaporator 11 is provided in the outflow side circuit of the first turbine 2 and heats the working fluid by a high-temperature heat source (not shown) (for example, waste heat of other equipment). In addition, as the 2nd fluid evaporator 11, you may use sunlight as a heat source like the 1st fluid evaporator 10. FIG.

  In the regeneration cycle power generator of this embodiment, the first and second generators G1 and G2 are driven by the first and second turbines 2 and 3, respectively, as in the above embodiment. At that time, since the working fluid flowing into the second turbine 3 from the first turbine 2 is reheated by the second fluid evaporator 11, a high-temperature and high-pressure working fluid is always allowed to flow into the second turbine 3. Therefore, the thermal efficiency of the entire apparatus can be further improved. For example, in the configuration of the present embodiment shown in FIG. 3B, compared to the case where the configuration corresponding to the second fluid evaporator 11 of the present embodiment is not provided as in the regeneration cycle shown in FIG. By reheating the second fluid evaporator 11, the temperature can be increased from step C to step D, and the thermal efficiency can be increased accordingly.

  In the above embodiment, the first and second turbines 2 and 3 are connected to the first and second generators G1 and G2, respectively. However, the third embodiment shown in FIG. As shown in FIG. 1, the first and second turbines 2 and 3 may be coaxially connected to the rotating shaft of one generator G. In this case, since one generator G can be driven by the first and second turbines 2 and 3, the entire apparatus can be reduced in size.

  Further, by using the well-known turbines 2 and 3 as the first and second power generators as in the above-described embodiment, high power can always be obtained. By using a known scroll type expander as the second power generator, a small and low-cost device can be realized.

  Furthermore, in the said embodiment, although the fluid evaporator 1 which uses sunlight for a heat source was shown, you may use other heat sources, such as a ground heat, a thermal power, the waste heat of an internal combustion engine or a boiler, for example.

1 is a schematic configuration diagram of a regenerative cycle power generator showing a first embodiment of the present invention. Schematic configuration diagram of a regenerative cycle power generator showing a second embodiment of the present invention Temperature-entropy diagram Schematic configuration diagram of a regenerative cycle power generator showing a third embodiment of the present invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fluid evaporator, 2 ... 1st turbine, 3 ... 2nd turbine, 4 ... Condenser, 5 ... 1st heater, 6 ... 2nd heater, 8 ... 1st pump, 9 ... 2nd pump, 10 ... 1st fluid evaporator, 11 ... 2nd fluid evaporator, G ... generator, G1 ... 1st generator, G2 ... 2nd generator.

Claims (5)

A fluid evaporator that heats and evaporates the working fluid with a predetermined heat source, a first power generator that generates power by expansion of the working fluid evaporated by the fluid evaporator, and one that flows out of the first power generator A second power generator that generates power by expansion of the working fluid in the section, a condenser that condenses the working fluid that flows out from the second power generator, and a first power that generates the working fluid that flows out from the condenser A heater for heating with some other working fluid flowing out from the machine, a first pump for sucking the working fluid flowing out from the condenser and discharging it to the heater side, and a working fluid flowing out from the heater And a second pump that discharges to the fluid evaporator side, wherein the generator is driven by the first and second power generators.
A regeneration cycle power generator comprising a heater for heating the working fluid flowing out from the condenser with the working fluid flowing out from the second power generator. The regenerative cycle power generator according to claim 1, further comprising a fluid evaporator that heats the working fluid flowing from the first power generator to the second power generator by a predetermined heat source. The regenerative cycle power generator according to claim 1 or 2, wherein the first and second power generators are coaxially connected to a rotating shaft of a generator. The regenerative cycle power generator according to claim 1, 2, or 3, wherein a turbine is used as the first and second power generators. The regenerative cycle power generator according to claim 1, 2, or 3, wherein a scroll type expander is used as the first and second power generators.

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