JP2015148161A - Heat source supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source supply device capable of improving power generation efficiency of a binary power generator while suppressing a usage amount of hot water supplied from a heat source.SOLUTION: In a heat source supply device 1 disposed between a heat source 2 and a binary power generator 3, a heating medium m supplied from the heat source 2 is separated into hot water w1 and steam s by a steam water separator 4, the hot water w1 is supplied to the binary power generator 3 through a hot water line 5, warm water w2 which is obtained by taking away heat from the hot water w1 to lower a temperature with the binary power generator 3 is discharged from the binary power generator 3 through a warm water line 7, thermal energy of the steam s is supplied to the warm water w2 flowing through the warm water line 7 through a heat exchanger 9 to heat the warm water w2, and the heated warm water (heated water w3) is supplied to the hot water line 5 through a circulation line 11.

Description

  The present invention relates to a heat source supply device for supplying hot water supplied from a heat source such as geothermal to a binary power generation device, and more specifically, to improve power generation efficiency by the binary power generation device while suppressing the amount of hot water used. It is related with the heat source supply apparatus which can do.

  A binary power generation device is used as a device for generating power using geothermal heat (see, for example, Patent Document 1). In the power generation system proposed in Patent Document 1, hot water supplied from a heat source such as a geothermal well is sent to an evaporator of a binary power generation apparatus, and the working medium is evaporated by the thermal energy of the hot water, Steam is sent to the steam turbine to generate electricity. Meanwhile, steam supplied from a heat source is sent to a separately installed steam turbine to generate electricity.

  In this power generation system, the amount of hot water required according to the amount of power generated by the binary power generation device is pumped up and deprived of a certain amount of thermal energy, and then discarded into the reduction well. It cannot be said that it is fully utilized and waste occurs. For example, if the source of a hot spring area is used as a heat source, the energy of the hot spring water is wasted due to the operation of the binary power generator, and the amount of hot spring water may decrease or the hot spring may be depleted. Hot spring inns, etc. are reluctant to install binary power generators.

  A steam turbine that is in direct contact with steam supplied from a heat source is likely to corrode and requires frequent maintenance. For this reason, the cost for maintaining and managing the binary power generation apparatus is large, and the cost ratio to the profit obtained by power generation is high, so that further improvement in power generation efficiency is desired.

JP 2013-79587 A

  The present invention has been made in view of the above problems, and an object thereof is to provide a heat source supply device capable of improving the power generation efficiency of the binary power generation device while suppressing the amount of hot water supplied from the heat source. It is to be.

  In order to achieve the above object, a heat source supply device of the present invention is a heat source supply device arranged between a heat source and a binary power generation device, wherein the heating heat medium supplied from the heat source is heated water and steam. A brackish water separator, a hot water line for supplying the hot water separated by the brackish water separator to the binary power generator, and the hot water is deprived of heat by the binary power generator and the temperature decreases. A hot water line that discharges the hot water from the binary power generator, a heat exchanger that supplies thermal energy of the steam to the hot water flowing through the hot water line, and hot water heated by the heat energy in the heat exchanger. And a circulation line for supplying the hot water line.

ADVANTAGE OF THE INVENTION According to this invention, the hot water supplied from the heat source can be reused by heating the hot water that has been deprived of heat by the binary power generation device and discharged with the steam supplied from the heat source. That is, even after the hot water becomes hot water, it can be circulated between the binary power generation device and the heat exchanger to be effectively used repeatedly, and the amount of hot water pumped up from the heat source can be reduced accordingly. When the heat source is a hot spring source, it is possible to avoid the problem that a large amount of hot water is pumped up for power generation and the source is depleted. In other words, it is possible to achieve both the use of the heat source as a hot spring and the use of the heat source as an energy source for power generation, so that it is easy to promote the spread of the binary power generation device in the hot spring area.

  In addition, even hot water deprived of heat by a binary power generator has a certain amount of thermal energy, and it can be used for power generation by adding steam thermal energy without wasting this thermal energy, improving thermal efficiency Can improve power generation efficiency.

  Here, for example, a distributor for branching the hot water line to a hot water demand line extended toward the hot water demand destination is installed, and the hot water flowing through the hot water line is supplied to the hot water demand line at a predetermined rate by this distributor. It can also be. According to this configuration, it is possible to supply hot water that has been deprived of thermal energy by the binary power generator and discharged to the hot water demand line. Therefore, the temperature of the hot water supplied to the hot water demand line can be adjusted by adjusting the flow rate of the hot water supplied to the binary power generator and adjusting the amount of heat taken from the hot water in the binary power generator. If the hot water demand destination is a hot spring bath, hot water whose temperature has been adjusted can be supplied to the bathtub while generating electricity. At this time, the temperature of the hot water can be adjusted without performing addition for heating or cooling using external energy.

  It is also possible to provide a mixer that is installed at the junction of the circulation line and the hot water line, and the hot water and hot water are mixed by this mixer. According to this configuration, even if there is a temperature difference between the hot water heated by steam and supplied from the circulation line and the hot water supplied from the hot water line, the hot water and hot water are actively mixed in the mixer, It is supplied to the binary power generator as a fluid with no temperature unevenness. That is, since the fluid is supplied to the binary power generation device by the mixer at a uniform temperature, stable power generation can be performed.

  The hot water line may be provided with a hot water tank for storing a predetermined amount of hot water flowing through the hot water line. Since warm water can be temporarily stored in the warm water tank, a desired amount of warm water can be sent to the heat exchanger regardless of the flow rate of warm water flowing through the warm water line. This is advantageous for stable power generation.

  It is also possible to provide a steam condensate line that joins the steam condensate generated by the heat deprived of heat in the heat exchanger to the hot water. Thereby, the heat energy of the heat source can be utilized without further waste.

It is explanatory drawing which illustrates the outline | summary of the heat-source supply apparatus of this invention. It is explanatory drawing which illustrates the outline | summary of another embodiment of a heat-source supply apparatus.

  Hereinafter, the heat source supply device of the present invention will be described based on the embodiments shown in the drawings.

As illustrated in FIG. 1, the heat source supply device 1 of the present invention is disposed between the heat source 2 and the binary power generation device 3, and is used to send hot water w <b> 1 supplied from the heat source 2 to the binary power generation device 3. Device. The heat source supply device 1 includes a brackish water separator 4 that separates the heating medium m supplied from the heat source 2 into hot water w1 and steam s, and the hot water w1 separated by the brackish water separator 4 as a binary power generator. 3 is provided with a hot water line 5 to be supplied to 3. In addition, the heat source supply device 1 includes a hot water line 7 that discharges hot water w <b> 2, which has been deprived of heat by the binary power generation device 3, and a reduced temperature, from the binary power generation device 3, and hot water w <b> 2 that flows through the hot water line 7. A heat exchanger 9 for supplying heat energy of the steam s, and a circulation line 11 for supplying hot water (hereinafter referred to as heated water w3) heated by the heat energy of the steam s to the hot water line 5 in the heat exchanger 9; It has.

  In this embodiment, the mixer 12 installed in the junction part of the circulation line 11 and the hot water line 5 is further provided. The warm water line 7 includes a warm water tank 8 that stores a predetermined amount of warm water w2 flowing through the warm water line 7. Moreover, the steam condensate line 19 which joins the steam condensate water w4 which the steam s deprived of the heat | fever with the heat exchanger 9 and produced | generated to the warm water w2 is provided.

  If the structure of this embodiment is explained in full detail, the valve 14 is installed in the line which connects heat sources 2, such as a geothermal well, and the brackish water separator 4. FIG. This valve 14 can adjust the flow rate of the heating medium m for heating supplied to the brackish water separator 4 by changing the degree of valve opening. The brackish water separator 4 and the evaporator 6 of the binary power generator 3 are connected by a hot water line 5, and a mixer 12 is installed in the middle of the hot water line 5. The evaporator 6 and the heat exchanger 9 of the binary power generator 3 are connected by a hot water line 7. A hot water tank 8 is installed in the middle of the hot water line 7, and a pump 13 is provided downstream of the hot water tank 8. Is installed. The flow rate of the hot water w2 supplied from the hot water tank 8 to the heat exchanger 9 can be adjusted by the pump 13. The heat exchanger 9 and the mixer 12 are connected by a circulation line 11, and the hot water line 7 and the circulation line 11 are connected via the heat exchanger 9.

  A hot water demand line 17 is connected to the hot water tank 8, and the hot water demand line 17 extends to the hot water demand destination 16. That is, the hot water line 7 branches the hot water demand line 17 through the hot water tank 8 at a midway position, and a valve 18 is installed in the hot water demand line 17. By changing the degree of opening of the valve 18, the flow rate of the hot water w2 supplied from the hot water tank 8 to the hot water customer 16 can be adjusted.

  The brackish water separator 4 and the heat exchanger 9 are connected by a steam supply line 10, and a valve 15 is installed in the middle of the steam supply line 10. A steam condensate line 19 extends from the heat exchanger 9 and is connected to the hot water demand line 17. The valve 15 can adjust the flow rate of the steam s supplied from the brackish water separator 4 to the heat exchanger 9 by changing the degree of valve opening.

In this embodiment, the hot water w <b> 1 separated by the brackish water separator 4 is sent to the evaporator 6 of the binary power generator 3 through the hot water line 5. The temperature of the hot water w1 is, for example, 90 ° C to 100 ° C. The hot water w <b> 1 sent to the evaporator 6 configured by a so-called heat exchanger is deprived of heat by the working heat medium circulating in the binary power generation device 3, and the temperature drops, for example, 55 ° C. to 75 ° C. It becomes warm water w2. This warm water w2 is sent to the warm water tank 8 through the warm water line 7 and temporarily stored. The allowable storage amount of the hot water tank 8 is, for example, 20 to 50 m ³ . The hot water w2 stored in the hot water tank 8 is sent to the heat exchanger 9 through the hot water line 7 by the pump 13.

  On the other hand, the steam s separated by the brackish water separator 4 is supplied to the heat exchanger 9 through the steam supply line 10. Here, the hot water w2 sent to the heat exchanger 9 through the hot water line 7 is, for example, 80 ° C. to 100 ° C. by heat exchange with, for example, 100 ° C. steam s supplied from the steam separator 4 through the steam supply line 10. Of heated water (heated water w3). The heated water w3 joins the hot water w1 flowing through the hot water line 5 through the mixer 12 installed in the middle of the hot water line 5 through the circulation line 11. That is, at least a part of the hot water w1 circulates in the heat source supply device 1 while changing into the hot water w2 and the heated water w3.

Further, the steam s sent to the heat exchanger 9 and deprived of heat becomes, for example, steam condensed water w4 of 55 ° C. to 75 ° C. The steam condensed water w4 flows through the steam condensed water line 19 through the hot water demand line 17. Join w2.

  The hot water w2 that has been deprived of heat and discharged by the binary power generation device 3 is heated by the steam s and is sent again to the binary power generation device 3 as the heating water w3 and circulates. Therefore, the amount of hot water w1 pumped from the heat source 2 is used It is possible to generate power with the binary power generator 3 while suppressing the above. When the heat source 2 is a hot spring source, since the amount of hot water w1 pumped from the source can be suppressed by using the heat source supply device 1 of the present invention, the source is depleted by pumping the hot water w1 accompanying power generation. Can be avoided. The flow rates of the warm water w2 and the heated water w3 in the warm water line 7 and the circulation line 11 are, for example, 3 to 6 ton / h.

  Further, since the hot water w2 having a certain thermal energy, which has been conventionally discarded in the reduction well or the like, is heated and reused with the steam s, the power generation efficiency can be improved by improving the thermal efficiency. By improving the power generation efficiency, the amount of hot water w1 used can be further suppressed.

  In this embodiment, for example, when the flow rate of the hot water w1 supplied to the binary power generation device 3 is insufficient, the flow rate of the hot water w2 supplied from the hot water tank 8 to the heat exchanger 9 is increased by the pump 13, and the valve 15 By increasing the valve opening degree and increasing the flow rate of the steam s supplied to the heat exchanger 9, the heated water w3 having high thermal energy and a large flow rate can be merged with the hot water w1. As a result, sufficient heat energy can be supplied to the binary power generation device 3, so that the amount of power generation can be stabilized.

  Even if the flow rate of the warm water w2 discharged from the binary power generation device 3 is small, if the flow rate of the warm water w2 sent from the warm water tank 8 to the heat exchanger 9 is increased by the pump 13, the result is the heating water w3. The flow rate is increased, and a larger amount of heated water w3 can be supplied to the binary power generation device 3. As a result, fluctuations in the amount of thermal energy supplied to the binary power generator 3 can be suppressed, which is advantageous for stable power generation.

  When the heat source 2 is a hot spring source and the hot water demand destination 16 is a hot spring tub, the hot water w2 can be supplied to the tub while generating electricity. The temperature of the hot water w2 can be adjusted by adjusting the ratio of the hot water w1 and the heated water w3 supplied to the binary power generation device 3 or by adjusting the temperature when heating the heated water w3 with the steam s. The hot water w <b> 2 having the temperature can be supplied to the hot water demand destination 16. It is also possible to supply the hot water w2 that has been radiated by adjusting the storage time of the hot water w2 in the hot water tank 8 and lowered to a desired temperature to the bathtub.

  Further, when it is desired to increase the temperature of the hot water w2 supplied to the bathtub, the flow rate of the steam s sent to the heat exchanger 9 is increased, the temperature of the steam condensed water w4 obtained thereby is increased, and this steam condensed water w4. Are combined with warm water w2. The steam condensed water w4 may contain steam s in part.

  According to this structure, since the temperature of this hot water w2 can be adjusted without performing heating for heating or cooling using external energy, the hot water w2 supplied to the bathtub becomes 100% of the source spring and lowers the value of the hot spring. There is no. In other words, the quality of the hot water w2 supplied to the bathtub is ensured, which is advantageous for hot spring inns that provide hot springs. In recent years, hot springs with no source of water or heating are highly valued by customers, and have great advantages for hot springs.

  Conventionally, when the temperature of hot water supplied from a hot spring in a hot spring resort is high, the hot water is circulated through a flow path formed by a pipe or the like, and the temperature is lowered by heat radiation before being supplied to the bathtub. That is, conventionally, the thermal energy of warm water was discharged wastefully into the atmosphere by heat radiation, but power generation can be performed using this thermal energy without wasting it according to the present invention.

  Conventionally, for a hot spring inn in a hot spring area, the installation of a binary power generation device has not provided sufficient benefits for power generation against risks such as exhaustion of the heat source and a decrease in the amount of hot water. However, the present invention can greatly reduce the risk of exhaustion of source springs and a decrease in the amount of hot water, and can improve the power generation efficiency of the binary power generation apparatus, so that it becomes easy to promote the spread of the binary power generation apparatus to hot spring inns and the like.

  The steam condensed water line 19 can also be connected from the heat exchanger 9 to the hot water line 7 or the hot water tank 8. In this case, the amount of the hot water w2 can be increased by further combining the steam condensed water w4 with the hot water w2 circulating in the heat source supply device 1, thereby further reducing the amount of hot water used.

  Like this embodiment, it is set as the structure which installs the mixer 12 in the confluence | merging part of the hot water line 5 and the circulation line 11, and mixes hot water w1 and heating water w3 by this mixer 12 actively. desirable. The mixer 12 has, for example, a rotary blade installed in a flow path through which the hot water w1 and the heated water w3 flow, and the hot water w1 and the heated water w3 can be mixed by the rotation of the rotary blade. . If the mixer 12 has the structure which mixes the hot water w1 and the heating water w3, it will not be restricted to the structure which has a rotary blade.

  Even if there is a temperature difference between the hot water w1 and the heated water w3 due to the installation of the mixer 12, the mixture of the hot water w1 and the heated water w3 is supplied to the binary power generation device 3 as a homogeneous fluid without temperature unevenness. Can do. By supplying hot water w1 or the like without temperature unevenness, fluctuations in the amount of steam of the working heat medium generated by the evaporator 6 can be suppressed, so that the binary power generator 3 can generate power more stably.

  As shown in the embodiment illustrated in FIG. 2, a distributor 20 that branches the hot water line 7 into the hot water demand line 17 may be installed. The distributor 20 has a function of supplying the hot water w2 flowing through the hot water line 7 to the hot water demand line 17 at a predetermined rate. That is, the distributor 20 functions as a branch valve, and can arbitrarily adjust the amount of hot water w2 supplied to the hot water demand line 17. Therefore, when there is no demand at the hot water demand destination 16, the supply of the hot water w2 to the hot water demand destination 16 can be stopped for an arbitrary period. In the embodiment shown in FIG. 1, the hot water tank 8 also functions as the distributor 20. In this embodiment, the steam condensed water line 19 extends from the heat exchanger 9 and is connected to the hot water line 7 at a position between the heat exchanger 9 and the distributor 20. Other configurations are the same as in the previous embodiment.

  When the temperature difference between the hot water w1 supplied from the brackish water separator 4 and the heated water w3 heated by the heat exchanger 9 is small and the temperature unevenness in the hot water w1 joined by the heated water w3 hardly occurs, this implementation is performed. It can also be set as the structure abbreviate | omitted without installing the mixer 12 in the hot-water line 5 like a form.

DESCRIPTION OF SYMBOLS 1 Heat source supply apparatus 2 Heat source 3 Binary power generation apparatus 4 Brackish water separator 5 Hot water line 7 Hot water line 8 Hot water tank 9 Heat exchanger 11 Circulation line 12 Mixer 16 Hot water demand 17 Hot water demand line 19 Steam condensate water line 20 Distributor m Heating medium w1 Heating water w2 Hot water w3 Heating water w4 Steam condensed water s Steam

Claims (5)

A heat source supply device disposed between the heat source and the binary power generator,
A brackish water separator that separates the heating medium supplied from the heat source into hot water and steam, a hot water line that supplies the hot water separated by the brackish water separator to the binary power generation device, and the hot water A hot water line that discharges hot water, which has been deprived of heat by the binary power generator, from the binary power generator, and a heat exchanger that supplies thermal energy of the steam to the hot water flowing through the hot water line; A heat source supply device comprising: a circulation line that supplies hot water heated by the heat energy in the heat exchanger to the hot water line.   A distributor for branching the hot water line to a hot water demand line extended toward the hot water demand destination is installed, and the hot water flowing through the hot water line is supplied to the hot water demand line at a predetermined ratio by the distributor. The heat source supply device according to claim 1.   3. The heat source supply device according to claim 1, further comprising a mixer installed at a confluence portion of the circulation line and the hot water line, wherein the hot water and the hot water are mixed by the mixer.   The heat source supply device according to any one of claims 1 to 3, wherein the hot water line includes a hot water tank for storing a predetermined amount of hot water flowing through the hot water line.   The heat source supply device according to any one of claims 1 to 4, further comprising a steam condensate water line that joins the steam condensate generated by the heat deprived of heat in the heat exchanger to the hot water.

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