JP6249227B2 - Heating system - Google Patents

Description

  The present invention relates to a heating system that uses a plurality of Rankine cycles to heat a fluid and raise the temperature.

  Conventionally, as disclosed in Patent Document 1 below, a Rankine cycle (2) including an evaporator (6), an expander (7), a condenser (9), and a circulation pump (10) is known. The working fluid of the Rankine cycle (2) is vaporized by absorbing heat from the heat source water (5) in the evaporator (6), and rotates the expander (7) to drive the generator (3) as a driven machine. In the condenser (9), heat is radiated to the cooling water (8) and liquefied. Then, the working fluid is again sent to the evaporator (6) by the circulation pump (10).

JP 2013-100811 A

  When the Rankine cycle is used alone, there is a limit to the amount of work that can be taken out by the expander. In particular, the heating fluid that heats the Rankine cycle working fluid in the evaporator has a constant temperature (typically, the heating fluid releases latent heat in the evaporator and the constant temperature), and the Rankine cycle working fluid in the condenser. When raising the temperature of the heat receiving fluid heated by (the heat receiving fluid acquires sensible heat in the condenser), there is a limit to the amount of work that can be taken out using only one Rankine cycle.

  Therefore, the problem to be solved by the present invention is that the working fluid is heated by the heated fluid at a constant temperature in the evaporator, and the work volume that can be taken out to the driven machine in the heating system that heats the received fluid in the condenser and raises the temperature. Is to increase.

The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 includes a plurality of Rankine cycles installed in parallel, and the plurality of Rankine cycles are provided in each uppermost evaporator. The working fluid is heated by the heating fluid at a constant temperature, and the heat receiving fluid is sequentially passed through the lowermost condensers, and the number of stages is decreased in the order in which the heat receiving fluid is passed. Rankine cycles passed through are single-stage or multi-stage, the top Rankine cycles are combined into one Rankine cycle, and one Rankine cycle from the top to the bottom is combined into one Rankine cycle. In addition, the stages corresponding to each other in parallel are grouped together, and each grouped Rankine cycle includes a first condenser and a second condenser, and each first condenser has one Also it serves as the evaporator stage of the Rankine cycle, a heating system heat fluid in the second condenser characterized in that it is passed sequentially.

According to invention of Claim 1, about the several Rankine cycle installed in parallel, the structure of the whole heating system can be simplified by putting together the stage corresponding to parallel in one.

According to a second aspect of the invention, before Symbol respective uppermost evaporator, Azukanetsu fluid releases latent heat, the each bottom of the condenser, the heat receiving fluid and acquires the sensible heat The heating system according to claim 1.

According to the invention described in claim 2, given the thermal fluid will release latent heat, it is possible to stably heat the working fluid of the Rankine cycle.

In the invention according to claim 3 , the upper and lower Rankine cycles adjacent to each other are indirect heat exchangers in which the upper first condenser also serving as a lower evaporator exchanges heat without mixing working fluids, The working fluid from the second condenser at the upper stage is gas-liquid separated, and the gas phase part is connected to the lower expander and the liquid phase part is connected to the upper pump. The heating system according to claim 1 or 2 .

According to invention of Claim 3 , the Rankine cycle which adjoins up and down can be connected using an indirect heat exchanger or a gas-liquid separator.

Furthermore, in the invention according to claim 4 , in the adjacent upper and lower Rankine cycles, instead of omitting the installation of the first condenser, the upper second condenser and the lower expander are connected, The heating system according to claim 1 or 2 , wherein the lower pump and the upper pump are connected, or these pumps are configured as one pump.

According to invention of Claim 4 , the structure of the whole heating system can be further simplified by putting together an upper and lower Rankine cycle into one.

  ADVANTAGE OF THE INVENTION According to this invention, the working fluid is heated by the heating fluid of fixed temperature in an evaporator, and the work amount which can be taken out to a driven machine can be increased in the heating system which heats a receiving fluid in a condenser and heats up. .

It is the schematic which shows Example 1 of the heating system of this invention. It is a TS diagram of the heating system of Example 1, the vertical axis shows temperature T and the horizontal axis shows entropy S. It is the schematic which shows Example 2 of the heating system of this invention. It is a TS diagram of the heating system of Example 2, the vertical axis | shaft shows the temperature T and the horizontal axis shows the entropy S. It is the schematic which shows Example 3 of the heating system of this invention. It is the schematic which shows Example 4 of the heating system of this invention. It is the schematic which shows the state which implement | achieved the heating system of this invention with the steam drive device.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the heating system of the present invention is not limited to the following examples, and can be appropriately changed without departing from the gist of the claims.

  FIG. 1 is a schematic diagram showing Example 1 of the heating system 1 of the present invention. FIG. 2 is a TS diagram of the heating system 1 according to the first embodiment, in which the vertical axis indicates the temperature T and the horizontal axis indicates the entropy S.

  The heating system 1 of the present embodiment includes a first Rankine cycle 2 and a second Rankine cycle 3.

  The first Rankine cycle 2 is composed of a single-rank Rankine cycle in this embodiment. Specifically, the first Rankine cycle 2 is configured by sequentially connecting a water supply pump 4, an evaporator 5, an expander 6 and a condenser 7 in a ring shape, and the working fluid is accompanied by a phase change in this circuit. Circulated. The working fluid is, for example, water or a refrigerant.

  The feed water pump 4 supplies the working fluid liquefied by the condenser 7 to the evaporator 5.

  The evaporator 5 evaporates by heating the working fluid with the heating fluid. That is, the evaporator 5 is an indirect heat exchanger between the working fluid and the heating fluid, and the working fluid is heated to steam by the heat of the heating fluid. In FIG. 1, the heating fluid is passed through the flow path 8.

  The expander 6 is passed through the working fluid vaporized by the evaporator 5 and reduces the pressure and temperature of the working fluid. The expander 6 is not particularly limited, and is, for example, a turbine, a screw expander, or a scroll expander. The expander 6 is typically rotated by the working fluid from the evaporator 5 and operates a driven machine (not shown). The driven machine is not particularly limited, but is typically a generator or a compressor (for example, an air compressor).

  The condenser 7 cools and liquefies the working fluid with the heat receiving fluid. That is, the condenser 7 is an indirect heat exchanger between the working fluid and the heat receiving fluid, and cools the working fluid with the heat receiving fluid to condense. At this time, the heat receiving fluid is heated by the heat of the working fluid to raise the temperature. In FIG. 1, the heat receiving fluid is passed through the flow path 9.

  The heating fluid that heats the working fluid in the evaporator 5 has a constant temperature in this embodiment. Typically, the heated fluid releases latent heat in the evaporator 5. That is, the heating fluid is steam (for example, water vapor), is condensed in the evaporator 5, and the working fluid is heated at a constant temperature (saturation temperature) by the latent heat of condensation. However, when there is a large amount of the heating fluid and the temperature change can be ignored, the heating fluid may release sensible heat in the evaporator 5.

  The heat receiving fluid heated by the working fluid in the condenser 7 is heated by the working fluid and heated. That is, the heat receiving fluid acquires sensible heat in the condenser 7. For example, the heat receiving fluid is water, heated by the working fluid in the condenser 7 and led out as hot water.

  In the present embodiment, the second Rankine cycle 3 is composed of two upper and lower Rankine cycles. Specifically, the upper Rankine cycle 3A on the high temperature side and the lower Rankine cycle 3B on the low temperature side are configured. The upper and lower Rankine cycles 3A and 3B constituting the second Rankine cycle 3 have basically the same configuration as the single-rank first Rankine cycle 2 described above. That is, the feed water pumps 10A and 10B, the evaporators 11A and 11B, the expanders 12A and 12B, and the condensers 13A and 13B are sequentially connected in a ring shape. In this embodiment, the upper and lower Rankine cycles 3A and 3B are connected by an indirect heat exchanger 14 that exchanges heat without mixing each other's working fluid, and this indirect heat exchanger 14 is condensed in the upper Rankine cycle 3A. It also serves as the evaporator 13A and the evaporator 11B of the lower Rankine cycle 3B. In the second Rankine cycle 3, the working fluid is heated by a heated fluid having a constant temperature in the evaporator 11 </ b> A of the upper Rankine cycle 3 </ b> A, and the heat receiving fluid is heated by the working fluid in the condenser 13 </ b> B of the lower Rankine cycle 3 </ b> B. Warm up. The heat exchanger connecting the upper Rankine cycle 3A and the lower Rankine cycle 3B is the indirect heat exchanger 14 that exchanges heat without mixing the working fluids of the Rankine cycles 3A and 3B. It is good also as a direct heat exchanger which makes fluid contact directly and heat-exchanges.

  In the illustrated example, the heated fluid is passed through the evaporator 5 of the first Rankine cycle 2 and then to the upper evaporator 11A of the second Rankine cycle 3, but conversely, the second Rankine cycle is passed. After passing through the upper evaporator 11 </ b> A of the cycle 3, it may be passed through the evaporator 5 of the first Rankine cycle 2. Alternatively, the heating fluid may be passed through the evaporator 5 of the first Rankine cycle 2 and the upper evaporator 11A of the second Rankine cycle 3 in parallel. In any case, in this embodiment, in the evaporator 5 of the first Rankine cycle 2 and the upper evaporator 11A of the second Rankine cycle 3, the working fluid of each Rankine cycle 2 and 3 is heated at a constant temperature. Heated by fluid.

  The heat receiving fluid passes through the lower condenser 13 </ b> B of the second Rankine cycle 3, and then passes through the condenser 7 of the first Rankine cycle 2. The heat receiving fluid is sequentially heated and heated by passing through the condensers 13B and 7 of the Rankine cycles 3 and 2 in order.

  The expander 6 in the first Rankine cycle 2 and the expanders 12A and 12B in the second Rankine cycle 3 operate driven machines such as a generator and an air compressor. At this time, each expander 6 , 12A, 12B may be combined to operate one (that is, a common) driven machine, or each expander 6, 12A, 12B may be operated individually.

  By the way, typically, the temperature and pressure of the working fluid in the upper condenser 13A of the second Rankine cycle 3 are equivalent (same or set) to the temperature and pressure of the working fluid in the condenser 7 of the first Rankine cycle 2. Within the range). That is, it is preferable that the upper Rankine cycle 3A of the second Rankine cycle 3 and the first Rankine cycle 2 have the same configuration including the working fluid.

  As will be described later, the second Rankine cycle 3 may be composed of a plurality of Rankine cycles installed in parallel. In this case, however, the plurality of Rankine cycles installed in parallel are sequentially counted from the uppermost stage. In the corresponding stage Rankine cycle, the temperature and pressure of the working fluid in the condenser should be equal. For example, in the case of a heating system comprising a single first Rankine cycle, two second Rankine cycles, and a third third Rankine cycle in parallel, each uppermost Rankine cycle is connected to the working fluid in the condenser. The temperature and pressure are made equal, and the temperature and pressure of the working fluid in the condenser are preferably made equal between the lower Rankine cycle of the second Rankine cycle and the middle Rankine cycle of the third Rankine cycle.

  As shown in FIG. 2, the heating system 1 of the present embodiment is shown as three substantially trapezoids in the TS diagram. Of the three substantially trapezoids, the upper right approximate trapezoid indicates the first Rankine cycle 2, the upper left approximately trapezoid indicates the upper Rankine cycle 3 </ b> A of the second Rankine cycle 3, and the lower left approximately trapezoid indicates the lower rank of the second Rankine cycle 3. Rankine cycle 3B is shown. In each Rankine cycle 2, 3A, 3B, the working fluid is adiabatic compression between the a1-b1, a2H-b2H, a2L-b2L by the feed pumps 4, 10A, 10B, b1-b1'-c1, b2H-b2H. '-C2H, b2L-b2L'-c2L, isobaric heating by evaporators 5, 11A, 11B, adiabatic expansion by expanders 6, 12A, 12B between c1-d1, c2H-d2H, c2L-d2L, d1- The a1, d2H-a2H and d2L-a2L are cooled at the same pressure by the condensers 7, 13A, 13B. As is clear from the figure, the relationship is preferably a1 = d2H = c2L. Further, typically, there is a relationship of S3 = (S1 + S2) / 2.

  In addition, the heating fluid that gives heat to the working fluid in the evaporators 5 and 11A is a constant temperature T2, and the heat receiving fluid that receives heat from the working fluid in the condensers 13B and 7 is heated from T1L to T1H, and the expander 6 , 12A, 12B, a driven machine (for example, a generator) can be operated to take out work. Although details will be described in the second embodiment, according to the heating system 1 of the present embodiment, work can be taken out as compared with the prior art by the amount of a substantially trapezoid in the lower left.

Next, a modification of the first embodiment will be described.
In the above embodiment, the first Rankine cycle 2 is composed of a single Rankine cycle, and the second Rankine cycle 3 is composed of two upper and lower Rankine cycles 3A and 3B. As long as the number of stages is greater than 2, the number of stages of each Rankine cycle 2 and 3 can be changed as appropriate. In any case, in the uppermost evaporator 5 of the first Rankine cycle 2 and the uppermost evaporator 11A of the second Rankine cycle 3, the working fluid is heated by the heating fluid having a constant temperature. Further, the heat receiving fluid is sequentially passed through the lowermost condenser 13B of the second Rankine cycle 3 and the lowermost condenser 7 of the first Rankine cycle 2, and the working fluid of each Rankine cycle 2 and 3 is cooled. Meanwhile, the temperature of the heat receiving fluid is increased by heating. In particular, in each of the uppermost evaporators 5 and 11A, the heated fluid releases latent heat, and in each of the lowermost condensers 13B and 7, the heat receiving fluid should acquire sensible heat.

  Moreover, in the said Example, the 2nd Rankine cycle 3 may be comprised from the several Rankine cycle installed in parallel. In other words, in the embodiment, in addition to the first Rankine cycle 2 and the second Rankine cycle 3, a third Rankine cycle may be provided, a fourth Rankine cycle, a fifth Rankine cycle, and so on. As a whole, n (n ≧ 2) Rankine cycles may be installed in parallel. Also in this case, in the n Rankine cycles, the working fluid is heated by the heating fluid at a constant temperature in each uppermost evaporator, and the heat receiving fluid is sequentially passed through each lowermost condenser to be heated. The number of stages is reduced in order in which the heat receiving fluid is passed (preferably so as to be reduced step by step).

  FIG. 3 is a schematic diagram showing Example 2 of the heating system 1 of the present invention. FIG. 4 is a TS diagram of the heating system according to the second embodiment, in which the vertical axis indicates the temperature T and the horizontal axis indicates the entropy S.

  The heating system 1 of the second embodiment is basically the same as that of the first embodiment and its modification. Therefore, in the following, the difference between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  The heating system 1 according to the second embodiment corresponds to a combination of the first Rankine cycle 2 and the upper Rankine cycle 3A of the second Rankine cycle 3 as one Rankine cycle in the first embodiment. And as a whole, it is composed of a two-stage Rankine cycle.

  The upper Rankine cycle 3 </ b> A includes a first condenser 15 and a second condenser 16. In this embodiment, the first condenser 15 is an indirect heat exchanger between the working fluid of the upper Rankine cycle 3A and the working fluid of the lower Rankine cycle 3B, and the condenser 13A and the lower Rankine cycle 3B of the upper Rankine cycle 3A. It also serves as the evaporator 11B. On the other hand, the second condenser 16 is an indirect heat exchanger between the working fluid and the heat receiving fluid of the upper Rankine cycle 3A. The heat receiving fluid is passed through the condenser 13B of the lower Rankine cycle 3B and then passed through the second condenser 16 of the upper Rankine cycle 3A, and is heated and heated in order. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  As shown in FIG. 4, the heating system 1 of the present embodiment is shown as two substantially trapezoids in the TS diagram. Of the two approximate trapezoids, the upper approximate trapezoid indicated by the solid line indicates the upper Rankine cycle 3A, and the lower approximate trapezoid indicated by the two-dot chain line indicates the lower Rankine cycle 3B.

  The merit of the heating system 1 of this invention is demonstrated based on the TS diagram of FIG. Here, the heating fluid that gives heat to the working fluid in the evaporator 11A is a constant temperature T2, and the heat receiving fluid that receives heat from the working fluid in the condensers 13B and 16 is heated from T1L to T1H, and the expanders 12A, 12A, Consider a case where a driven machine (for example, a generator) is operated at 12B to extract work.

  In the figure, a cycle indicated by a solid line is a conventional Rankine cycle. As is well known, in an ideal state, the working fluid is adiabatic compression by a feed pump between a and b, isobaric heating by an evaporator between b and b 'and c, adiabatic expansion by an expander between cd and d. -A isobaric cooling by a condenser between -a. Moreover, the horizontal line L2 which shows the state of a heating fluid, and the inclined line L1 which shows the state of a heat receiving fluid are decided according to a substance, and are known.

  Now, the working fluid of the Rankine cycle cannot be higher than the temperature T2 of the heating fluid because it is heated by heat exchange with the heating fluid. Therefore, theoretically, the evaporation temperature of the working fluid in the Rankine cycle is limited to T2. Of course, in practice, a predetermined temperature difference is required for heat exchange between the heating fluid and the working fluid, and therefore, the evaporation temperature of the working fluid is lower than the temperature T2 of the heating fluid.

  On the other hand, in an expander, work can be taken out so that there is a heat insulation heat drop. However, the working fluid of the Rankine cycle cannot be lower than the condenser outlet temperature (heating target temperature) T1H of the heat receiving fluid because it is cooled by heat exchange with the heat receiving fluid. Therefore, theoretically, the condensation temperature of the working fluid in the Rankine cycle is limited to T1H. Of course, in practice, a predetermined temperature difference is required for heat exchange between the heat receiving fluid and the working fluid, and therefore, the condensation temperature of the working fluid is higher than the condenser outlet temperature T1H of the heat receiving fluid.

  In addition, since the area surrounded by the Rankine cycle is the work amount, it is preferable to build the Rankine cycle as large as possible on the TS diagram in order to extract the work to the maximum. For this reason, a Rankine cycle is conventionally constructed as shown by a solid line.

  On the other hand, in this invention, it corresponds to what added the Rankine cycle shown with a dashed-two dotted line to the conventional Rankine cycle shown with this continuous line. Therefore, more work can be taken out by the amount corresponding to the added Rankine cycle. For example, when operating a generator with an expander, the power generation efficiency of the whole system can be improved.

Next, a modification of the second embodiment will be described.
As described in the modification of the first embodiment, the number of Rankine cycles constituting the heating system 1 is not limited to two but may be three or more. In this case, the Rankine cycle of each stage is provided with the first condenser 15 and the second condenser 16 as condensers except for the lowermost stage, and the upper and lower Rankine cycles are connected using the first condenser 15. The heat receiving fluid may be passed through the second condenser 16 in order from the lower stage to the upper stage after passing through the lowermost condenser 13 </ b> B. In other words, it is equivalent to the following configuration.

  That is, as described in the modification of the first embodiment, the second Rankine cycle 3 in the first embodiment may be configured by a plurality of Rankine cycles installed in parallel. In the Rankine cycle, the uppermost Rankine cycles are combined into one Rankine cycle, and the Rankine cycles that are one lower from the uppermost stage are combined into one Rankine cycle. May be grouped together. Each combined Rankine cycle includes a first condenser 15 and a second condenser 16 except for the lowest stage, and each first condenser 15 also serves as an evaporator of one lower Rankine cycle. The heat receiving fluid is sequentially passed through each second condenser 16.

FIG. 5 is a schematic diagram showing Example 3 of the heating system 1 of the present invention.
The heating system 1 of the third embodiment is basically the same as that of the second embodiment and its modification. Therefore, in the following, the difference between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  In Example 2, the first condenser 15 that connects the upper Rankine cycle 3A and the lower Rankine cycle 3B is an indirect heat exchanger 14 that exchanges heat without mixing the working fluids of the Rankine cycles 3A and 3B. However, in the third embodiment, the working fluid from the upper second condenser 16 is gas-liquid separated so that the gas phase portion is connected to the lower expander 12B and the liquid phase portion is connected to the upper pump 10A. Gas-liquid separator 17.

  Specifically, as is clear from FIG. 5, the working fluid of the upper Rankine cycle 3 </ b> A is passed through the second condenser 16 from the upper stage expander 12 </ b> A and then the gas-liquid separator ( A hollow tank) 17 is discharged. The working fluid in the gas phase portion of the gas-liquid separator 17 is sent to the expander 12B of the lower Rankine cycle 3B. On the other hand, the working fluid in the liquid phase portion of the gas-liquid separator 17 is sent to the feed water pump 10A of the upper Rankine cycle 3A. The working fluid from the feed water pump 10B of the lower Rankine cycle 3B is supplied to the gas-liquid separator 17 or joined to the pipeline from the gas-liquid separator 17 to the feed water pump 10A of the upper Rankine cycle 3A.

  Also in the third embodiment, the number of Rankine cycles constituting the heating system 1 is not limited to two but can be three or more. In this case, the Rankine cycle of each stage is provided with the first condenser 15 and the second condenser 16 as condensers except for the lowermost stage, and the upper and lower Rankine cycles are connected using the first condenser 15. The heat receiving fluid may be passed through the second condenser 16 in order from the lower stage to the upper stage after passing through the lowermost condenser, and the temperature may be increased. A gas-liquid separator 17 as shown in FIG. 5 can be used as the first condenser 15. However, in some stages, an indirect heat exchanger 14 as shown in FIG. 3 may be used instead of the gas-liquid separator 17.

FIG. 6 is a schematic view showing Example 4 of the heating system 1 of the present invention.
The heating system 1 of the fourth embodiment is basically the same as that of the second embodiment and its modification. Therefore, in the following, the difference between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  In the heating system 1 of the fourth embodiment, the upper and lower Rankine cycles 3A and 3B adjacent to the upper and lower Rankine cycles 3A and 3B, instead of omitting the installation of the first condenser 15, are compared with the second embodiment. Are connected to the lower expander 12B, and the lower feed pump 10B and the upper feed pump 10A are connected in series, or these feed pumps 10A and 10B are configured as one feed pump 10. In the illustrated example, the working fluid is the feed water pump 10, the upper evaporator 11A, the upper expander 12A, the upper condenser 7 (second condenser 16), the lower expander 12B, and the lower condenser 13B. In order.

  Also in the fourth embodiment, the number of Rankine cycles constituting the heating system 1 is not limited to two but can be three or more. In that case, regarding the connection between adjacent upper and lower Rankine cycles, the outlet side of the upper condenser 7 (second condenser 16) and the inlet side of the lower expander 12B are connected while the lowermost condenser. What is necessary is just to connect the exit side of 13B, and the inlet side of the evaporator 11A of the uppermost stage with the water supply pump 10. FIG.

  By the way, in each said Example and its modification, the 1st Rankine cycle 2 and / or the 2nd Rankine cycle 3 are replaced with each Rankine cycle which comprises it, as shown in FIG. It may be provided. The steam drive device 18 is a machine that operates the driven machine with the power of steam, like the expander of the Rankine cycle. In the illustrated example, a single-stage steam drive device 18 and a two-stage steam drive device 18 are provided in parallel. However, three or more stages of steam drive devices 18 may be provided in parallel. In any of the steam driving devices 18, steam is injected from above in the drawing and discharged downward. The steam after use in the lowermost steam driving device 18 is condensed by indirect heat exchange with the heat receiving fluid, or is injected into a conduit through which the heat receiving fluid flows. Then, the working fluid condensed by indirect heat exchange with the heat receiving fluid, or the heat receiving fluid heated by injection of the working fluid can be supplied to a water supply tank of a boiler, for example.

  When steam from the boiler is supplied to the steam driving device 18 to drive the driven machine and the steam driving device 18 observes a steam system that returns the drain of used steam to the boiler, water is vaporized in the boiler, and the steam Then, the steam driving device 18 is rotated, and the steam drain is returned to the boiler via the feed water pump. That is, the same action as the working fluid of the Rankine cycle is performed, and the steam driving device 18 can be used instead of the Rankine cycle. In other words, the first Rankine cycle 2 and / or the second Rankine cycle 3 can use the steam drive unit 18 instead of each Rankine cycle (part or all Rankine cycles) constituting the first Rankine cycle 2 and / or the second Rankine cycle 3. A working fluid other than water may be used.

DESCRIPTION OF SYMBOLS 1 Heating system 2 1st Rankine cycle 3 2nd Rankine cycle 3A Upper Rankine cycle 3B Lower Rankine cycle 4 Water supply pump 5 Evaporator 6 Expander 7 Condenser 8 Heated fluid flow path 9 Receiving fluid flow path 10A, 10B Feed water Pump 11A, 11B Evaporator 12A, 12B Expander 13A, 13B Condenser 14 Indirect heat exchanger 15 First condenser 16 Second condenser 17 Gas-liquid separator 18 Steam drive device

Claims (4)

With multiple Rankine cycles installed in parallel,
The plurality of Rankine cycles are:
In each uppermost evaporator, the working fluid is heated by a constant temperature heating fluid,
The heat receiving fluid is sequentially passed through the lowermost condensers, and the number of stages is reduced in the order in which the heat receiving fluid is passed,
The Rankine cycle through which the heat receiving fluid is passed last is a single stage or multiple stages,
The uppermost Rankine cycles are grouped together into one Rankine cycle, and the Rankine cycles one lower from the uppermost stage are grouped into one Rankine cycle.
Each combined Rankine cycle comprises a first condenser and a second condenser,
Each first condenser also serves as the evaporator of the lower Rankine cycle,
A heating system, wherein a heat receiving fluid is passed through each second condenser in turn . Prior Symbol respective uppermost evaporator, Azukanetsu fluid releases latent heat,
The heating system according to claim 1, wherein the heat receiving fluid acquires sensible heat in each of the lowermost condensers. In the adjacent upper and lower Rankine cycle, the upper first condenser also serving as the lower evaporator is an indirect heat exchanger that exchanges heat without mixing working fluids, or from the second upper condenser. claim, characterized in that the gas phase portion of the working fluid by gas-liquid separation is a gas-liquid separator the liquid phase portion is connected to the upper pump is connected to the lower expander 1 or claim 2 The heating system described in. In the adjacent upper and lower Rankine cycles, instead of omitting the installation of the first condenser, the upper second condenser and the lower expander are connected, while the lower pump and the upper pump are connected. Or these pumps are comprised as one pump. The heating system of Claim 1 or Claim 2 characterized by the above-mentioned.

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