JP5946563B1 - Purification device and heat exchange system using the purification device - Google Patents

Abstract

A purification device for sustaining low-cost and high-efficiency power generation and a heat exchange system using the purification device are provided. A purification apparatus according to the present invention is connected to a flow path through which a thermal fluid flows, and a container in which an anode and a cathode are arranged to face each other and a space is formed between the anode and the cathode. In addition, after performing control to apply a voltage between the anode and the cathode in a state where a predetermined liquid is interposed in the space, and storing electrolyzed water generated by applying the voltage to the predetermined liquid, And a control device that controls to supply at least a part of the stored electrolyzed water to the flow path. [Selection] Figure 1

Description

  The present invention relates to a purification apparatus and a heat exchange system using the purification apparatus, and more specifically to an apparatus for purifying deposits adhering to the inside of a pipe or a tank using electrolytic water.

  In recent years, attention has been focused on clean energy in anticipation of depletion of crude oil resources or future increases in crude oil prices. Since clean energy uses the natural environment as much as possible to generate electricity, it is very significant from the viewpoint of reducing carbon dioxide emissions. Among these clean energies, power generation using heat exchangers that use underground high-pressure and high-temperature hot water or industrial wastewater has a higher level of stable supply than wind power generation, and thus has gained more attention in the industry. ing.

Among these, the geothermal power generation system uses a gas-liquid two-phase thermal fluid pressurized and heated in the deep underground, and the geothermal steam generated when this thermal fluid is ejected to the ground through a well is guided to the turbine for power generation. Has been done.
On the other hand, in recent years, development of geothermal power generation systems using hot spring water as a thermal fluid has been promoted. In Japan, where hot springs are scattered all over the country, attempts have been made to cover electricity demand using hot spring water that abounds.

In this geothermal power generation system using hot spring water, hot spring water is introduced into a heat exchanger installed on the ground, and heat is exchanged with the working fluid separately introduced into the heat exchanger to generate working fluid vapor. Let Then, the steam of the working fluid is introduced into the steam turbine to rotate the turbine, and a power is generated by the generator using this rotation.
After the steam discharged from the steam turbine is cooled and liquefied in the condenser, it is repeatedly sent to the heat exchanger, heated by the geothermal water, and introduced into the steam turbine as steam.

As for the above-described power generation system using hot spring water, a technique focused on enhancing the energy use efficiency of the thermal fluid as exemplified in Patent Document 1 below has been proposed.
For example, according to this Patent Document 1, hot spring water and the like are continuously supplied to the power generation device by using the spring output of hot spring water, the jet output of hot spring gas, the height difference (difference in potential energy), and the like. Is disclosed (for example, see Patent Document 1).

JP 2013-201873 A

  However, when geothermal water including hot spring water is used, it is assumed that the following problems occur. That is, the hot spring water contains components such as minerals such as calcium and sulfur, and is deposited on the inner wall of the piping and inside the heat exchanger in the circulation system including the heat exchanger. When this deposit adheres to the surface of the heat exchanger, for example, the heat exchange efficiency between the heat fluid and the working fluid is remarkably lowered, and in the worst case, there is a risk of clogging of the pipe or failure of the heat exchanger.

On the other hand, if the heat exchangers and piping are regularly cleaned by human naval tactics, clogging of piping and failure of the heat exchanger will be reduced, but the benefits of binary power generation will be lost due to the increase in costs. It must be avoided.
In addition, it is conceivable to introduce a chemical into a heat exchanger or piping for cleaning, but in recent years, the use of such a chemical has been restrained from the viewpoint of preventing environmental pollution.
Note that this problem can occur not only in the thermal fluid containing impurities but also in the inflowing liquid flowing into the heat exchanger or the like, and how to reduce the energy transfer efficiency between the fluids while reducing the cost will be discussed in the future. It becomes important.

  In view of the above-described problems, an object of the present invention is to provide a purification device for sustaining low-cost and high-efficiency power generation and a heat exchange system using the purification device.

In order to solve the above problems, a heat exchange system according to an embodiment of the present invention is (1) a heat exchange system including a purification device and a heat exchanger connected to the purification device via a flow path. The purification device is connected to the flow path through which the thermal fluid flows, and has a first container in which an anode and a cathode are arranged to face each other and a space is formed between the anode and the cathode. A second water tank is connected to the first container and includes an acidic water tank for storing acidic water among the electrolytic water generated in the first container, and an alkaline water tank for storing alkaline water among the electrolytic water. The container is controlled to apply a voltage between the anode and the cathode in a state where a predetermined liquid is interposed in the space, and the electrolyzed water generated by applying the voltage to the predetermined liquid is After storing in the second container, The acidic water stored in a container is supplied to the flow path, and the acidic water supplied to the flow path passes through the heat exchanger and is discharged to the outside of the heat exchange system. And a control device that performs control to add the alkaline water, and the control device heats flowing into the heat exchanger while heat exchange processing is continued in the heat exchanger by the thermal fluid. Control which adds the said acidic water to a fluid for every predetermined period is performed.

In the heat exchange system according to (1), (2) heat exchange is performed by the first temperature sensor that detects the temperature of the thermal fluid supplied to the heat exchanger and the heat exchanger. A second temperature sensor for detecting a temperature of the thermal fluid discharged from the heat exchanger; and the control device is configured to control the acidic water based on the measurement values of the first temperature sensor and the second temperature sensor. It is preferable to perform a control to supply to the flow path.
In the heat exchange system according to (1) or (2), (3) the control device changes the amount of the acidic water to be added at each predetermined period to change the acidic water to the heat. It is preferable to control the addition to the fluid.
Moreover, in the heat exchange system in any one of said (1)-(3), (4) The temperature sensor which is arrange | positioned at the said acidic water tank and detects the temperature of the acidic water stored, and said acidic A temperature control device that is disposed in the water tank and adjusts the temperature of the stored acidic water, and the control device is configured to control the temperature of the stored acidic water based on a detection result of the temperature sensor. It is preferable to perform control to be adjusted by the adjusting device.
Furthermore, in order to solve the above-described problem, a cleaning method for a heat exchange device according to an embodiment of the present invention includes a voltage between the anode and the cathode in a first container in which the anode and the cathode are arranged to face each other. The step of generating acidic water and alkaline water by applying and the generated acidic water is stored in an acidic water tank connected to the first container, while the generated alkaline water is stored in the first container. In the process of storing in the connected alkaline water tank and the heat exchange process being continued in the heat exchanger, the heat fluid is connected to the heat exchanger and the heat fluid flows into the heat exchanger. Adding the acidic water to the acidic water before the discharge of the acidic water supplied to the flow path after passing through the heat exchanger; And a step of adding.

  According to the present invention, a part of so-called electrolyzed thermal fluid for components (such as minerals such as calcium ions and magnesium ions) that are included in the thermal liquid flowing into the heat exchange system and the like and cause a decrease in capacity. Can be removed efficiently while maintaining the scale of the apparatus. Furthermore, since the liquid used for purification is not a chemical solution with a large environmental load, it can also contribute to prevention of pollution of the global environment.

1 is an overall configuration diagram of a purification apparatus according to a first embodiment of the present invention and a heat exchange system including the purification apparatus. It is a lineblock diagram of the purification device concerning a 1st embodiment of the present invention. It is a block diagram of the acidic water tank which concerns on 1st Embodiment of this invention. It is a state figure showing the flow of fluid at the time of performing the 1st purification mode among the purification methods of the present invention. It is a state diagram which shows the flow of the fluid when the 1st purification | cleaning mode of this invention is complete | finished and acidic water is discharged | emitted out of a system. It is a state diagram which shows the flow of the fluid at the time of performing 2nd purification mode among the purification methods of this invention. It is a whole block diagram of the purification apparatus which concerns on 2nd Embodiment of this invention, and the heat exchange system containing this purification apparatus. It is a whole block diagram of the purification apparatus which concerns on 3rd Embodiment of this invention, and the heat exchange system containing this purification apparatus. It is a whole block diagram explaining the modification based on this invention.

  In the following, an embodiment for carrying out the present invention will be described by taking as an example a heat exchange system that performs heat exchange of a thermal fluid in a heat exchanger. However, the purification apparatus of the present invention is not limited to the heat exchange system, and can be applied to various systems other than the heat exchange system.

<< First Embodiment >>
FIG. 1 is an overall configuration diagram of a purification device according to a first embodiment of the present invention and a heat exchange system including the purification device.
The heat exchange system of the present embodiment is connected to a flow path through which a thermal fluid flows, and a container in which an anode and a cathode are arranged to face each other and a space is formed between the anode and the cathode; Control is performed to apply a voltage between the anode and the cathode while a predetermined liquid is interposed in the space, and the electrolyzed water is stored while storing the electrolyzed water generated by applying the voltage to the predetermined liquid. And a control device that performs control to supply at least a part of the flow path to the flow path.
As a more specific configuration, the heat exchange system includes a first pipe L1 to a sixteenth pipe L16 in which flow paths are formed, a heat exchanger 1, an auxiliary heat exchanger 2, a steam turbine 3, a generator 4, and a water covering ( Condenser) 5, purification device 6 (6 a, 6 b, 6 c) and overall control device 7 are included. Other than the configuration described in detail below, for example, appropriately refer to known power generation systems described in JP2013-170553A, JP2014-181697A, JP2005-337060A, and the like. Also good.

In the present embodiment, the purification device 6 includes an electrolyzed water generation tank 6a, an acid water tank 6b, an alkaline water tank 6c, and a pipe L (L3, L4, L5, etc.), and is illustrated from the water source WS. Liquid is supplied through a pump that does not. And in this purification apparatus 6, it is possible to electrolyze the liquid supplied from the water source WS to generate electrolyzed water, and to store the generated electrolyzed water.
In the present embodiment, the water source WS is a water source that is independent of a thermal fluid source HS described later, and examples thereof include waterworks. That is, in this embodiment, water is supplied from the water supply to the electrolyzed water generation tank 6a via the pipe L3.
The detailed structure of the purification device 6 and the details of the cleaning process will be described later.

The heat exchanger 1 is connected to the thermal fluid source HS via the first pipe L1, and reduces the thermal fluid that has finished heat exchange with the working fluid described later to the river or the like via the second pipe L2. (Drain). In the present embodiment, the sixth pipe L6 is connected to the first pipe L1 via the check valve CVa, and the valve Va (a three-way valve is preferable. The tenth pipe L10 is connected via a three-way valve as Va). That is, the thermal fluid from the thermal fluid source HS can selectively flow into the heat exchanger 1 side and the reduction (drainage) side via the valve Va installed in the first pipe L1. .
Further, the heat fluid exchanged by the heat exchanger 1 may be reused appropriately as a heat fluid again without draining.

  Here, although there is no restriction | limiting in particular in "thermal fluid source HS" and "thermal fluid" in this embodiment, For example, using hot spring well as thermal fluid source HS, about 50 to 150 degreeC which springs out from this hot spring well is used. Hot spring water is used as the thermal fluid. In addition to the hot spring water described above, the thermal fluid source HS and the thermal fluid applicable in the present embodiment include, for example, industrial waste water (waste hot water generated in the process of industrial production such as hot water washing) and conventional geothermal heat. There are high-pressure groundwater from geothermal wells used for power generation (collectively referred to as “hot water” as appropriate).

The auxiliary heat exchanger 2 is connected to the heat exchanger 1 through the eleventh pipe L11, the twelfth pipe L12, the pump P, and the like, and is connected to the steam turbine 3 through the thirteenth pipe L13, etc. It is connected to the water-covering (condenser) 5 through the fifteenth pipe L15 and the pump P.
The auxiliary heat exchanger 2 is arranged for the purpose of suppressing the influence of contamination by the thermal fluid obtained from the thermal fluid source HS, and is connected to the heat exchanger 1 (thermal fluid) using an auxiliary fluid with few impurities. In addition, heat exchange is performed at the same time, and further heat exchange is performed between the auxiliary fluid and the working fluid that have obtained energy by this heat exchange. Therefore, in the present embodiment, pure water in, for example, a gas phase (gas-liquid mixture) state and a liquid phase state flows through the eleventh pipe L11 and the twelfth pipe L12 as auxiliary fluids. A working fluid in a gas phase (gas-liquid mixture) state or a liquid phase flows in the thirteenth pipe L13 to the fifteenth pipe L15. The auxiliary fluid is not limited to pure water, and other fluids (such as liquids with suppressed mineral content) may be used.
Further, the auxiliary heat exchanger 2 may be omitted as appropriate. In this case, the heat exchanger 1 is connected to the steam turbine 3 through the thirteenth pipe L13 and the like and is covered with water through the fifteenth pipe L15. A (condenser) 5 is connected.

As the steam turbine 3, a known turbine used for so-called binary power generation is applicable, and the steam of the working fluid generated in the auxiliary heat exchanger 2 flows in through the thirteenth pipe L13.
Here, the “working fluid” of the present embodiment is not particularly limited except that a fluid having a boiling point lower than that of the thermal fluid is used. For example, various fluids such as butane (C ₄ H ₁₀ ) and alternative chlorofluorocarbon (HFE) Is applicable. In the present embodiment, pentane (C ₅ H ₁₂ ) having a boiling point of about 36 ° C. is used as the working fluid. That is, pentane as a working fluid receives heat transfer from an auxiliary fluid (such as pure water) in the auxiliary heat exchanger 2 and evaporates (vaporizes) to be converted into a gas phase (or gas-liquid mixed) state. It is introduced into the steam turbine 3 through the pipe L13.

A known generator used for binary power generation can be applied to the generator 4, and power generation is performed based on the steam of the working fluid that is connected to the steam turbine 3 and flows into the steam turbine 3. The electric power generated by the generator 4 is supplied to, for example, a substation or house of an electric power company via a transformer (not shown).
A known condenser (condenser) used for binary power generation can be applied to the water covering (condenser) 5 and is connected to the steam turbine 3 via a fourteenth pipe L14. In the water cover (condenser) 5, the working fluid (pentane or the like) in a vapor state that has passed through the steam turbine 3 is condensed using water or air (heat exchange is performed) and converted into a liquid working fluid. The converted liquid working fluid is again introduced into the auxiliary heat exchanger 2 through the fifteenth pipe L15, the pump P, and the like.

The overall control device 7 is, for example, a personal computer equipped with a central processing unit (CPU) and a display (not shown), and comprehensively controls each device constituting the heat exchange system described above. The overall control device 7 also has a function of executing a cleaning process (details will be described later) including a first purification mode and a second purification mode described later at a predetermined timing.
The operator can perform a cleaning process and the like under the control of the overall control device 7 via the display screen and an input device (not shown).

Next, the detailed structure of the purification apparatus 6 of this embodiment is demonstrated using FIG. 2 and 3. FIG.
FIG. 2 shows the structure of the electrolyzed water generation tank 6a as the first container in the purification device 6 of the present embodiment. As is clear from the figure, the electrolyzed water generation tank 6a includes a container 6a ₁ , an anode 6a ₂ , a cathode 6a ₃ , and a diaphragm 6a ₄ .
The container 6a ₁ is a hollow structure made of, for example, a metal or resin coated with an insulating material, and accommodates the above-described anode 6a ₂ , cathode 6a _3, diaphragm 6a _4, and the like. Incidentally, the container 6a ₁ may be covered with a heat insulating material as out of heat from the outside is suppressed.

Also, this container 6a _1, third pipe L3, and the fourth pipe L4, and the fifth pipe L5 is connected, through these pipes predetermined liquid flows into the container 6a ₁ or container 6a ₁ It is configured to be discharged from.
More specifically, the water source WS and the container 6a ₁ via a third pipe L3 and unshown pump is connected, acidic water tank 6b and the container 6a ₁ is connected through a fourth pipe L4, and alkaline water tank 6c and the container 6a ₁ is connected via a fifth pipe L5.

The electrode body including the anode 6a ₂ and the cathode 6a ₃ has a plate-like structure in this embodiment, and a desired voltage is applied between these electrode bodies via the commercial power source E and the wiring el. It is configured. The anode 6a ₂ and the cathode 6a ₃ are disposed to face each other in the container 6a ₁ , and a space is formed between the anode 6a ₂ and the cathode 6a ₃ .
As a material of the electrode body, for example, a general-purpose metal such as iron or copper, a noble metal such as platinum or gold which is not easily corroded, or an industrially inexpensive and stable carbon electrode is used.
In the present embodiment, the surfaces of the anode 6a ₂ and the cathode 6a ₃ facing each other have a planar shape. However, the present invention is not limited to this, and the surface shape may be wavy or uneven. Also good. In the case of a wave shape or an uneven shape, it is desirable that the phases are substantially aligned so that the surfaces facing each other have the same distance.

The diaphragm 6a ₄ is disposed between the anode 6a ₂ and the cathode 6a ₃ in the container 6a ₁ . The diaphragm 6a ₄ is a member that partitions a space in which the anode 6a ₂ is disposed in the container 6a ₁ and a space in which the cathode 6a ₃ is disposed, and ions and electrons are directed from one space to the other space. Etc. can pass. The membrane 6a _4, for example a known film such as a solid polymer electrolyte membrane is used.
Therefore, the water flowing into the space of the container 6a ₁ from the water source WS is electrolyzed by applying a voltage to the above-described electrode body under the control of the overall control device 7, thereby causing the electrolytic water to enter the container 6a ₁ . Is generated. More specifically, acidic water is generated in the space between the diaphragm 6a ₄ and the anode 6a ₂ in the container 6a ₁ , and alkaline water is generated in the space between the diaphragm 6a ₄ and the cathode 6a _3. The
In addition, the purification apparatus 6 of this embodiment does not necessarily need to be controlled by the overall control apparatus 7, and is controlled independently from the overall control apparatus 7 by a control apparatus arranged separately from the overall control apparatus 7. Also good.

Next, in FIG. 3, the detailed structure of the acidic water tank 6b as a 2nd container of this embodiment is shown.
As is apparent from the figure, the acidic water tank 6b of the present embodiment includes a container 6b ₁ , a temperature control device 6b ₂ , a temperature sensor 6b ₃ and the like. The temperature control device 6b ₂ and the temperature sensor 6b ₃ are not essential and may be omitted as appropriate. Then the container 6b ₁ supplied from the acidic water electrolyzed water production tank 6a through the fourth pipe L4, thereby the container 6b ₁ a predetermined amount of acidic water is stored.

The container 6b ₁ is a hollow structure made of, for example, a metal or resin coated with an insulating material. No particular limitation is imposed on the volume of the container 6b _1, and can be appropriately set in accordance with the scale of the cleaning process described below. For example, when electrolyzed water is generated at a rate of 3 L / min by the electrolyzed water generator 6a, it is desirable that the electrolyzed water generator 6a has a volume that can store about 2000L to 5000L of electrolyzed water.

The container 6b ₁ is a sixth pipe L6 and pump P and check valve is connected to the first pipe L1 via a CVa, acidic water stored in the vessel 6b ₁ (part of the electrolytic water) is first It can flow into one pipe L1.
Further, the container 6b ₁ is connected to the second pipe L2 via a seventh pipeline L7 and the valve Va, the acid water stored in the container 6b ₁ (part of electrolytic water) in the second pipe L2 It is possible to flow in.
Further, the container 6b ₁ is connected to a river or the like on the reduction (drainage) side through the ninth pipe L9, the pump P, the check valve CVa, etc., and used acidic water (a lot of stored water stored in the container 6b ₁ ) In this case, the pH value is close to neutrality), and can be discharged into rivers.

The temperature control device 6b ₂ is, for example, a known heater or cooler, and adjusts the temperature of the acidic water stored in the container 6b ₁ to a desired temperature. For example, when you want to increase the effectiveness of the cleaning process described later, the total control unit 7 may be controlled to heat the acidic water by controlling the temperature controller 6b _2.
The temperature sensor 6b ₃ is preferably a known thermocouple, for example, and detects the temperature of the acidic water stored in the container 6b ₁ . When it is desired to enhance the effect of the above-described cleaning process, the overall control device 7 may control the temperature adjustment device 6b ₂ based on the detection result of the temperature sensor 6b ₃ .

Moreover, the alkaline water tank 6c as a 2nd container of this embodiment is connected with the electrolyzed water production tank 6a via the 5th piping L5, and the alkaline water produced | generated by this electrolyzed water production tank 6a is supplied. The alkaline water tank 6c is connected to the second pipe L2 via the ninth pipe L9, the pump P, the valve Va, and the check valve CVa. Among these, the valve Va installed in the ninth pipe L9 is connected to the check valve CVa installed in the eighth pipe L8 via the sixteenth pipe L16.
With the above configuration, the alkaline water (other part of the electrolyzed water) stored in the alkaline water tank 6c can flow into the second pipe L2 via the eighth pipe L8, and the eighth pipe L8 and It can flow into the ninth pipe L9 through the sixteenth pipe L16.
Since the structure of the alkaline water tank 6c other than the above is structurally similar to that of the acidic water tank 6b, description thereof is omitted.

<Deposition in heat exchanger 1 and pipe L>
In the heat exchange system of the present embodiment, hot spring water containing minerals such as magnesium, potassium, sodium, calcium, etc. is part of the first pipe L1, the second pipe L2, and the heat exchanger 1. Is distributed. Therefore, when a predetermined time elapses after the heat exchange is started in the heat exchanger 1, solids shown below start to be deposited in the heat exchanger 1 or piping.
For example, in the case of a bicarbonate spring containing a large amount of calcium, when various conditions such as temperature and pH change, a part of the dissolved components in the hot spring water is converted into solids (C _a CO ₃ ) And deposited in the pipe and the heat exchanger 1.

Ca ²⁺ + 2HCO ^{3 −} → CaCO ₃ ↓ + H ₂ O + CO ₂ ↑ (1)

Therefore, in this embodiment, even when heat exchange (and power generation) using hot spring water as a thermal fluid is performed for a long time, a cleaning function is provided that can suppress a decrease in heat exchange efficiency due to the precipitates described above. As will be described later, the present embodiment is not limited to application to heat exchangers and pipes, and various systems in which a thermal fluid (such as hot spring water) in which a part of the components may be deposited are circulated. It can also be applied to devices, devices and parts.

<First purification mode>
First, the first purification mode in the cleaning process of the present embodiment will be described with reference to FIG.
In the first purification mode, at the time of cleaning, the thermal fluid from the thermal fluid source HS does not flow to the heat exchanger 1 but flows from the first pipe L1 to the tenth pipe L10 via the valve Va and is reduced to a river or the like. Is done. On the other hand, the acidic water stored in the acidic water tank 6b flows into the first pipe L1 through the sixth pipe L6, the pump P, and the check valve CVa. Since heat exchange in the heat exchange system is stopped, there is no state transition of the working fluid in the first purification mode.

The acidic water that has flowed into the first pipe L1 flows directly into the heat exchanger 1 and then flows into the second pipe L2, and then flows into the seventh pipe L7 via the valve Va on the second pipe L2. And then returned to the acidic tank 6b. In the present embodiment, under the control of the overall control device 7, the circulation of the acidic water is repeated once or a plurality of times, thereby depositing on the first pipe L1, the heat exchanger 1, the second pipe L2, etc. Things (minerals) are cleaned.
Normally, the pH of the acidic water stored in the acidic tank 6b is about 2 to 3, but it is assumed that the pH of the acidic water changes to nearly 7 when the above-described circulation is repeated.
Therefore, the overall control device 7 is used every predetermined time (every few minutes, every few tens of minutes, every several hours, etc.) or every time acidic water is circulated (every cycle, once every few times, etc.) You may perform control which supplies new acidic water to the acidic tank 6b from the electrolyzed water production tank 6a. This makes it possible to continue the above-described cleaning process while maintaining the purification capacity of acidic water during cleaning.

When the first purification mode is completed, the acidic water used for cleaning is discharged as shown in FIG.
Specifically, the overall control device 7 controls the pump P provided in the ninth pipe L9 to reduce the used acidic water stored in the acid tank 6b to a river or the like through the ninth pipe L9. To do. At this time, the overall control device 7 simultaneously controls the pump P and the valve Va disposed in the eighth pipe L8, so that the alkaline water stored in the alkaline water tank 6c passes through the eighth pipe L8 and the sixteenth pipe L16. Control to add to the ninth pipe L9 is performed.

As a result, the used acidic water flowing through the ninth pipe L9 is neutralized by the alkaline water supplied via the sixteenth pipe L16 and the check valve CVa and then reduced to a river or the like. Therefore, it is possible to prevent the liquid having high acidity from flowing to a discharge destination such as a river as it is, and to prevent the occurrence of environmental pollution.
A known pH detection device is further provided at the end of the ninth pipe L9, and the overall control device 7 controls the amount of alkaline water added to the ninth pipe L9 based on the detection result of the pH detection device. Also good.
Further, the thermal fluid that flows from the first pipe L1 into the tenth pipe L10 and is reduced to a river or the like may be used as a temperature control fluid. Specifically, the reduced thermal fluid may be guided to, for example, the fourth pipe L4, the sixth pipe L6, or the periphery of the acidic water tank 6b, and used for temperature control (heating) processing for these members. .

  According to the first purification mode described above, the electrolyzed water generated and stored by electrolyzing water from the water source WS that can be supplied in large quantities at low cost is used for cleaning, so it is clean without using special chemicals. And an inexpensive cleaning process can be performed. Further, in the first purification mode, the cleaning process is performed only with the acidic water, and when the acidic water is discharged to the outside, the alkaline water is used for neutralization before discharging, thereby suppressing the influence on the environment such as the river. It is possible.

<Second purification mode>
Next, the second purification mode in the cleaning process of the present embodiment will be described with reference to FIG.
The second purification mode is characterized in that electrolyzed water generated by electrolysis in the purification device 6 is added to the thermal fluid at predetermined intervals under the control of the overall control device 7. In other words, if the first purification mode in which the heat exchange process is stopped and the cleaning process is performed is an off-line type, the second purification mode can be said to be an on-line type in which the cleaning process is simultaneously performed while continuing the heat exchange process.

That is, first, liquid (water) is supplied in advance from the water source WS to the purification device 6 via the third pipe L3, a pump (not shown), and the like, and the anode 6a is supplied via the commercial power source E under the control of the overall control device 7. _A predetermined potential is applied between ₂ and the cathode 6a ₃ to generate electrolyzed water. In the generated electrolyzed water, acidic water is stored in the acidic tank 6b, and alkaline water is stored in the alkaline water tank 6c.
In addition, as long as supply of acidic water is in time, the production | generation process of electrolyzed water may be started simultaneously with the heat exchange by a heat exchange system operating.

  When heat exchange by the heat exchange system is started, as indicated by a dot pattern arrow in FIG. 6, a thermal fluid (hot spring) is supplied from a thermal fluid source HS such as a hot spring well through the first pipe L1 and a pump (not shown). Water) is pumped up and flows into the heat exchanger 1 and is discharged to a river or the like through the second pipe L2. Further, in the heat exchange system, as indicated by white arrows and grid line arrows in FIG. 6, the heat exchanger 1 and the auxiliary heat exchanger 2 change the heat fluid (hot spring water) to the auxiliary fluid (pure water). Then, heat exchange is performed between the auxiliary fluid and the working fluid that have received this heat transfer. The mode of binary power generation by the working fluid that has exchanged heat with the auxiliary fluid is as described above.

  On the other hand, the overall control device 7 controls the pump P provided in the sixth pipe L6, and removes a part of the acidic water stored in the acid tank 6b for each predetermined period from the sixth pipe L6 and the check valve. Control to add into the first pipe L1 through CVa is performed. In addition, as a predetermined period, arbitrary timings, such as every 10 minutes, every hour, every day, every week, etc., may be set, for example, the supply flow rate of the hot spring water to the heat exchanger 1, the flow velocity, etc. It is preferable to consider. For example, when hot spring water is caused to flow into the first pipe L1 at a speed of about 1 m / s, precipitation of 0.1 mm thickness is confirmed in about 30 minutes. Therefore, when it is desired to always maintain the cleanliness of the heat exchange system, the stored acidic water may be added to the thermal fluid, for example, every 30 minutes. In addition, the acidic water supply period is preferably longer as the period becomes longer. Moreover, when acid water is added in the above-mentioned predetermined cycle, acid water may be added at the same flow rate during the period, or the flow rate is changed within the period (with the intensity changed). You may add in L1.

  As described above, since the acidic water is added to the hot spring water flowing through the first pipe L1, the hot spring water changes to a liquid that not only has energy necessary for heat exchange with the auxiliary fluid but also has a purifying action. In this way, the heat fluid to which the acidic water is added flows into the heat exchanger 1 and heat exchange is performed with the auxiliary fluid described above. After this heat exchange, the second pipe L2 A hot fluid to which acidic water is added will circulate.

Further, the overall control device 7 controls the pump P installed in the eighth pipe L8, and a desired amount of alkali from the alkaline water tank 6c into the second pipe L2 via the eighth pipe L8 and the check valve CVa. Control to add water.
As a result, the acidic thermal fluid is neutralized, so that the influence on the outside such as a river can be minimized.
A known pH detection device is further provided on the terminal side of the second pipe L2, and the overall control device 7 controls the amount of alkaline water supplied to the eighth pipe L8 based on the detection result of the pH detection device. Good.

  According to the second purification mode described above, the electrolyzed water generated and stored by electrolyzing water from the water source WS that can be supplied in large quantities at low cost is used for cleaning, so it is clean without using special chemicals. And an inexpensive cleaning process can be performed. In the second purification mode, since the cleaning process is performed without stopping the heat exchange process in the heat exchange system, it is possible to suppress a decrease in the amount of power generation. Further, since the acidic water is discharged to the outside after being neutralized with alkaline water, it is possible to suppress the influence on the environment such as rivers.

<< Second Embodiment >>
Next, a second embodiment of the present invention will be described with reference to FIG.
In the first embodiment, the liquid is supplied to the purification device 6 from the water source WS separate from the thermal fluid source HS. However, in this embodiment, a part of the thermal fluid from the thermal fluid source HS is supplied to the purification device 6. Therefore, the system is mainly characterized in that it is a system that generates electrolyzed water.
Therefore, hereinafter, differences from the first embodiment will be mainly described, and elements having the same configuration or function as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof will be omitted as appropriate.

As shown in FIG. 7, the heat exchange system of the present embodiment includes a seventeenth pipe L17 that connects the purification device 6 and the first pipe L1, and a valve Va that connects the seventeenth pipe L17 and the first pipe L1. 'And a flow meter 6d provided in the seventeenth pipe L17.
The valve Va ′ is a member that supplies part of the thermal fluid flowing through the first pipe L1 to the seventeenth pipe L17, and various known valves can be applied.
The flow meter 6d is a device that measures the flow rate of the fluid (thermal fluid) flowing through the seventeenth pipe L17, and various known flow meters can be applied.

  In the present embodiment, a part of the thermal fluid flowing into the first pipe L1 from the thermal fluid source HS via the pump (not shown) flows into the seventeenth pipe L17 via the valve Va ′, and the remaining part is heat. It is supplied to the exchanger 1. The overall control device 7 appropriately adjusts the opening degree of the valve Va ′ based on the detection result of the flow meter 6d, and accordingly adjusts the amount of the thermal fluid flowing to the first pipe L1 and the seventeenth pipe L17. Is possible.

  According to the present embodiment, since electrolyzed water can be generated and used by using a part of the thermal fluid without using a separate water source WS, the scale of the system is relative to that of the first embodiment. Can be made smaller. Moreover, since electrolyzed water is produced | generated from a thermal fluid, the produced | generated acidic water becomes high temperature compared with 1st Embodiment, and it becomes possible to omit the effort which heats with the acidic tank 6b suitably, while improving washing | cleaning capability. .

«Third embodiment»
Next, a third embodiment of the present invention will be described with reference to FIG.
In the first embodiment and the second embodiment, binary power generation has been described as an example. However, in this embodiment, the thermal fluid (steam state) from the thermal fluid source HS is guided to the steam turbine to generate power. Is mainly characterized.
Accordingly, differences from the above embodiments will be mainly described below, and elements having the same configuration or function as those of the above embodiments will be denoted by the same reference numerals and description thereof will be omitted as appropriate.

As shown in FIG. 8, the heat exchange system of the present embodiment includes a purification device 6 (6 a, 6 b, 6 c), an overall control device 7, a separator 8, a steam turbine 9, a generator 10, a water covering (condenser) 11, And it is comprised including 18th piping L18-26th piping L26 etc. in which the flow path was formed, respectively.
The separator 8 is a device that receives the supply of the thermal fluid from the thermal fluid source HS via the 18th pipe L18 and the pump P, etc., and separates the thermal fluid into vapor and liquid, and various known separators are applied. Is possible. More specifically, the separator 8 supplies the separated steam of the supplied thermal fluid to the steam turbine 9 via the 19th pipe L19, and the separated liquid (warm water) via the 20th pipe L20. To the purification device 6.

The purification device 6 performs electrolysis described above on the liquid (thermal fluid) supplied from the separator 8 to generate electrolyzed water, and stores the generated electrolyzed water. Then, the purification device 6 controls the acidic water stored in the acidic water tank 6b through the 23rd pipe L23 when the first purification mode or the second purification mode is executed under the control of the overall control device 7. Supplied into 25 pipe L25.
The steam supplied to the steam turbine 9 is used for power generation by the generator 10, and thereafter converted into a liquid by the water covering (condenser) 11 through the 25th pipe L25 and then through the 26th pipe L26. It is returned (discharged) to rivers. At this time, the alkaline water stored in the alkaline water tank 6c is supplied into the 26th pipe L26 via the 24th pipe L24, the pump P, the check valve, and the like as in the above embodiments.

In this embodiment, the 23rd pipe L23 is connected to the 25th pipe L25 via a check valve, but is connected to other pipes (18th pipe L18, 19th pipe L19, 26th pipe L26, etc.). May be.
Also according to this embodiment, the piping and the like are cleaned using the electrolyzed water separated from the thermal fluid, so that not only the power generation system can be simplified, but also a clean and low-cost system can be realized. It becomes.

Each of the above-described embodiments can be variously modified without departing from the spirit of the present invention. Hereinafter, modifications that can be appropriately applied to each embodiment will be described. Also in the following modified examples, the same reference numerals are given to those having the same functions and operations as those described above, and the description thereof will be omitted as appropriate.
≪Modification≫
FIG. 9 is a configuration diagram showing a modification of the purification device 6 applicable to each of the above embodiments. The purification device 6 according to this modification includes a first temperature sensor S1 that detects the temperature of the thermal fluid flowing into the heat exchanger 1, and a second temperature sensor that detects the temperature of the thermal fluid discharged from the heat exchanger 1. S2 is included.

In this modification, the overall control device 7 uses the temperature sensor that detects the temperature of the thermal fluid to detect the acid water stored in the acid water tank 6b based on the detection result (measured value) of the first pipe L1. Control to supply to.
That is, when the heat exchange system is operated and a predetermined time elapses, the above-described solid matter is deposited in the heat exchanger 1 or the pipe, and the heat exchange efficiency is lowered. When the heat exchange efficiency is lowered, the difference between the temperature of the heat fluid flowing into the heat exchanger 1 and the temperature of the heat fluid discharged from the heat exchanger 1 becomes small.

Therefore, when the difference between the measured value of the first temperature sensor S1 and the measured value of the second temperature sensor S2 is equal to or less than a predetermined value, the overall control device 7 at least in the first purification mode or the second purification mode described above. Control to execute either one.
Thereby, a cleaning process can be automatically performed according to the production | generation state of the solid substance in the heat exchanger 1 or piping.

In addition, although the temperature sensor which measures the temperature of the thermal fluid entering / exiting with respect to the heat exchanger 1 was demonstrated in this modification, the measuring device which can apply this invention is not restricted to this. For example, as a measuring instrument, the voltage or current between the electrode bodies arranged in the electrolyzed water generation tank 6a may be detected, or the pressure of the fluid flowing through the first pipe L1 and the second pipe L2 may be detected. .
Moreover, in each embodiment and modification mentioned above, although acidic water was used as electrolyzed water utilized for a cleaning process, you may utilize alkaline water for cleaning according to the object which is not restricted to this but purifies.

The above-mentioned second container is not necessarily essential, and if the first container having a large capacity is used, the second container may be omitted as appropriate. Alternatively, a third container connected to the second container may be further provided to increase the amount of stored electrolyzed water (acidic water or alkaline water).
Further, a water amount sensor may be provided in the acidic water tank 6b or the alkaline water tank 6c, and the supply of the electrolyzed water from the electrolyzed water generation tank 6a may be continued until a predetermined capacity is reached.

You may comprise an electric power generation system combining the element of each embodiment and the modification which were demonstrated above suitably.
In the above description, the power generation system using a thermal fluid has been described as an example. However, the present invention may be applied to other types of power generation systems. The present invention may be applied to purification of other systems and devices, parts such as valves, or piping.

   As described above, the purification device, the heat exchange system, and the like of the present invention are suitable for constructing a clean, low-cost and high-efficiency system.

I Ammeters L1 to L26 Piping el Wiring 1 Heat exchanger 2 Auxiliary heat exchanger 3, 9 Steam turbine 4, 10 Generator (first generator)
5, 11 Water-covering (condenser) 6 Purification device 6a Electrolyzed water generation tank 6b Acidic tank 6c Alkaline water tank 6d Flow meter 7 Overall control device 8 Separator Va valve (three-way valve)
CVa check valve

Claims (5)

A purification device;
A heat exchanger connected to the purification device via a flow path;
A heat exchange system comprising:
The purification device comprises:
A first container that is connected to the flow path through which the thermal fluid flows and in which an anode and a cathode are arranged to face each other and a space is formed between the anode and the cathode;
A second container that is connected to the first container and includes an acidic water tank that stores acidic water among the electrolytic water generated in the first container, and an alkaline water tank that stores alkaline water among the electrolytic water. When,
Control is performed to apply a voltage between the anode and the cathode while a predetermined liquid is interposed in the space, and the electrolyzed water generated by applying the voltage to the predetermined liquid is the second container. The acidic water stored in the second container is supplied to the flow path, and the acidic water supplied to the flow path is discharged to the outside of the heat exchange system after passing through the heat exchanger. A control device for performing control to add the alkaline water to the acidic water before
Including
The control device performs control to add the acidic water to the thermal fluid flowing into the heat exchanger at predetermined intervals while heat exchange processing is continued in the heat exchanger with the thermal fluid. A heat exchange system characterized by performing. A first temperature sensor for detecting a temperature of the thermal fluid supplied to the heat exchanger;
A second temperature sensor for performing heat exchange with the heat exchanger and detecting a temperature of the thermal fluid discharged from the heat exchanger;
2. The heat exchange system according to claim 1, wherein the control device performs control to supply the acidic water to the flow path based on measurement values of the first temperature sensor and the second temperature sensor. 3. The heat exchange system according to claim 1, wherein the control device performs control to change the amount of the acidic water to be added at each predetermined period and add the acidic water to the thermal fluid. A temperature sensor disposed in the acidic water tank for detecting the temperature of the acidic water stored;
A temperature control device that is arranged in the acidic water tank and adjusts the temperature of the stored acidic water;
Including
The said control apparatus is a heat exchange system as described in any one of Claims 1-3 which performs control which adjusts the temperature of the stored said acidic water with the said temperature control apparatus based on the detection result of the said temperature sensor. A step of generating acidic water and alkaline water by applying a voltage between the anode and the cathode in a first container in which the anode and the cathode are arranged to face each other;
Storing the generated acidic water in an acidic water tank connected to the first container, while storing the generated alkaline water in an alkaline water tank connected to the first container;
A step of adding the acidic water to the flow path that is connected to the heat exchanger and into which the thermal fluid flows into the heat exchanger while the heat exchange process is continued in the heat exchanger at predetermined intervals. When,
Adding the alkaline water to the acidic water before the acidic water supplied to the flow path passes through the heat exchanger and is discharged to the outside;
A method of cleaning a heat exchanger, comprising: