JP7108665B2 - Water injection control system, geothermal heat utilization system, control device, control method, and program - Google Patents

Description

The present disclosure relates to a water injection control system, a geothermal heat utilization system, a control device, a control method, and a program.

In recent years, a geothermal heat utilization system has been proposed in which groundwater is pumped up from a well and used as a heat source or a cold heat source.

As a technology related to this, for example, Patent Document 1 discloses a geothermal heat utilization system that utilizes the heat of water taken from an aquifer via a heat exchanger and returns the water to the aquifer. ing.

JP 2018-173256 A

The geothermal heat utilization system disclosed in Patent Document 1 injects water from a pipe into a well via a pressure regulating valve.
However, in the geothermal heat utilization system disclosed in Patent Document 1, the pressure regulating valve opens and closes in relation to the detected pressure in the pipe, so when a transient pressure change occurs in the pipe, the pressure regulating valve operates. Sometimes I don't.
Therefore, the reliability of water injection control may be lowered.

The present disclosure has been made to solve the above problems, and provides a water injection control system, a geothermal heat utilization system, a control device, a control method, and a program that can improve the reliability of water injection control. With the goal.

In order to solve the above problems, the water injection control system according to the present disclosure includes a pressure regulating valve that adjusts the water injection from the main pipe extending inside the well to the well in relation to the water injection pressure from the sub pipe; A water injection control comprising a water injection solenoid valve for adjusting water injection into a pipe, and a drain solenoid valve for adjusting water discharge from the sub pipe to a drain pipe branching between the water injection solenoid valve and the pressure regulating valve. a system;

The control device according to the present disclosure includes a first control unit that controls a water injection solenoid valve that adjusts water injection into the sub pipe, the water injection solenoid valve from the sub pipe, and the water injection pressure from the sub pipe. , a pressure regulating valve that regulates water injection into the well from a main pipe extending inside the well; .

A control method according to the present disclosure controls a water injection solenoid valve that adjusts water injection into a sub-pipe. A pressure control valve that adjusts water injection from the extending main pipe to the well and a drain electromagnetic valve that adjusts water discharge to the drain pipe branched between the pressure control valve and the drain solenoid valve are controlled.

A program according to the present disclosure causes a computer to control a water injection solenoid valve that adjusts water injection into a sub pipe, and from the sub pipe, the water injection solenoid valve and the water injection pressure from the sub pipe. A program for executing a method of controlling a pressure regulating valve that regulates water injection into the well from an internally extending main pipe and a drain electromagnetic valve that regulates water discharge to a drain pipe branched between them.

According to the water injection control system, geothermal heat utilization system, control device, control method, and program of the present disclosure, the reliability of water injection control can be enhanced.

1 is a system diagram of a geothermal heat utilization system according to an embodiment of the present disclosure; FIG. 1 is a system diagram of a water injection control system including a partial cross-sectional view of a pressure regulator according to an embodiment of the present disclosure; FIG. 1 is a block diagram of a control device according to an embodiment of the present disclosure; FIG. 4 is a flow chart showing procedures of a control method according to an embodiment of the present disclosure; 1 is a system diagram of a water injection control system including a partial cross-sectional view of a pressure regulating valve according to a comparative example of the present disclosure; FIG. FIG. 4 is a cross-sectional view of a pilot valve during operation of a water injection valve according to a comparative example of the present disclosure; FIG. 4 is a cross-sectional view of a pilot valve when the water injection valve is closed according to a comparative example of the present disclosure; It is a figure showing an example of hardware constitutions of a computer with which a control device concerning an embodiment of this indication is provided.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. The same reference numerals are given to the same or corresponding configurations in all the drawings, and common explanations are omitted.

<Embodiment>
An embodiment of a geothermal heat utilization system according to the present disclosure will be described with reference to FIGS. 1 to 4. FIG.

(Configuration of geothermal heat utilization system)
As shown in FIG. 1 , the geothermal heat utilization system 9 includes a water injection control system 1 , a well 2 , a main pipe 3 , a heat exchanger 4 and a pump 5 .
For example, the geothermal heat utilization system 9 may include multiple water injection control systems 1 , multiple wells 2 , main piping 3 , heat exchangers 4 , and multiple pumps 5 .

(Composition of the well)
A plurality of wells 2 extend from the surface OG into the aquifer LY.
For example, wells 2 may include pumping wells 21 and injection wells 22 .
The geothermal heat utilization system 9 not only uses the stored water pumped up from the pumping well 21 for heat, but also pumps up water from the pumping well 22 . It uses stored water for heat. However, in order to simplify the explanation below, the case where water stored in the pumping well 21 is pumped up to the main pipe 3 and heat is exchanged will be mainly explained.

Each well 2 comprises a casing 2a embedded in a borehole HOL drilled from the surface OG to the aquifer LY underground.
The casing 2a has a strainer 2b made up of, for example, a plurality of slits.
The strainer 2b allows the well 2 to take groundwater from the aquifer LY into the casing 2a and to return stored water from the casing 2a to the aquifer LY.
For example, each well 2 may be provided with a water injection control system 1 and a pump 5 .

(Configuration of main piping)
The main pipe 3 extends inside the well 2 .
For example, both ends of the main pipe 3 may be immersed in water storage of the pumping well 21 and the injection well 22 so as to connect the pumping well 21 and the injection well 22 .
For example, each end of main pipe 3 may be immersed in a reservoir of water via water injection control system 1 .
For example, one end of the main pipe 3 is provided in the pumping well 21, and the other end of the main pipe 3 is the water injection so that the stored water pumped by the pump 5 can flow from the pumping well 21 toward the water injection well 22. It may be provided in the well 22 .

(Configuration of heat exchanger)
The heat exchanger 4 exchanges heat with water in the main pipe 3 via the main pipe 3 .
For example, heat exchange is performed between the heat exchanger 4 and water pumped from the well 2 and flowing through the main pipe 3, and the water after the heat exchange flows through the main pipe 3, may be irrigated.
For example, the heat exchanger 4 may be provided in the middle of the main pipe 3 on the ground OG.

(Pump configuration)
A pump 5 pumps water from the well 2 to the main pipe 3 .
For example, pump 5 may pump water stored in well 2 into main pipe 3 via water injection control system 1 .
For example, the pumps 5 may be provided at both ends of the main pipe 3 and immersed in water stored in the well 2 .
For example, the pump 5 may be able to change its output by inverter control.

(Configuration of water injection control system)
As shown in FIG. 2 , the water injection control system 1 includes a pressure regulating valve 11 , a water injection electromagnetic valve 12 and a water discharge electromagnetic valve 13 .
For example, the water injection control system 1 may further include a secondary pipe 14 , a drain pipe 15 , a check valve 16 , a pressure sensor 17 , a control valve 18 and a controller 19 .

For example, in the water injection control system 1 , the water injection solenoid valve 12 may close the sub pipe 14 and the drain solenoid valve 13 may open the drain pipe 15 , thereby opening the pressure regulating valve 11 .

For example, in the water injection control system 1 , the water injection solenoid valve 12 may open the sub pipe 14 and the drain solenoid valve 13 may close the drain pipe 15 , thereby closing the pressure regulating valve 11 .

(Structure of pressure regulating valve)
The pressure regulating valve 11 regulates water injection into the well 2 from the main pipe 3 extending inside the well 2 in relation to the water injection pressure from the sub pipe 14 .
The pressure regulating valves 11 are connected to each end of the main pipe 3 and configured to open and close each end of the main pipe 3 .

For example, the pressure regulating valve 11 may include a valve body adjusting chamber 111 , a valve body 112 and a flow path 113 .
For example, the pressure regulating valve 11 may adjust water injection into the well 2 in relation to water injection pressure into the valve body adjustment chamber 111 . At this time, the sub-pipe 14 communicates with the valve body adjustment chamber 111 , and the injection pressure from the sub-pipe 14 may be applied to the valve body adjustment chamber 111 .

For example, the pressure regulating valve 11 operates in relation to the water injection pressure in the valve body adjustment chamber 111 and the set pressure set by a spring, an adjustment screw, or the like. It may be configured to open and close the path 113 . At that time, the pressure regulating valve 11 is configured to close the flow path 113 with a pushing force generated by adding a set pressure set by a spring, an adjusting screw, etc. to the water injection pressure in the valve body adjusting chamber 111 . good too.

For example, when the water injection solenoid valve 12 closes the sub-pipe 14 and the drain solenoid valve 13 opens the drain pipe 15, the water injection pressure is not applied from the sub-pipe 14 to the valve element adjustment chamber 111, and the pressure above the set pressure The pressure regulating valve 11 may be opened with respect to the main pipe 3 having
For example, when the water injection solenoid valve 12 opens the sub-pipe 14 and the drain solenoid valve 13 closes the drain pipe 15, the water injection pressure is applied from the sub-pipe 14 to the valve body adjustment chamber 111, thereby increasing the pressure above the set pressure. The pressure regulating valve 11 may be closed with respect to the main pipe 3 provided.
As a result, the water injection control system 1 can operate the pressure regulating valve 11 while maintaining the inside of the main pipe 3 in a pressurized state throughout the opening and closing of the main pipe 3 by the pressure regulating valve 11 .

(Structure of water injection solenoid valve)
The water injection electromagnetic valve 12 adjusts water injection to the sub pipe 14 .
For example, the water injection solenoid valve 12 may be a solenoid valve that can be opened and closed in relation to the first control signal SG1 from the control device 19 .
For example, the water injection solenoid valve 12 may be provided in the middle of the sub-pipe 14 to open and close the channel of the sub-pipe 14 .
For example, the water injection electromagnetic valve 12 may be provided between the main pipe 3 and the drain pipe 15 in the sub pipe 14 .
For example, the water injection electromagnetic valve 12 may be provided on the ground OG.

(Configuration of drain solenoid valve)
The drain electromagnetic valve 13 regulates draining from the sub-pipe 14 to the drain pipe 15 .
For example, the drain solenoid valve 13 may be a solenoid valve that can be opened and closed in relation to the second control signal SG2 from the controller 19 .
For example, the drain electromagnetic valve 13 may be provided in the middle of the drain pipe 15 to open and close the channel of the drain pipe 15 .
For example, the drain solenoid valve 13 may be provided on the ground OG.

(Configuration of sub-pipe)
The sub pipe 14 extends toward the pressure regulating valve 11 .
The sub-pipe 14 is configured to inject water injected into one end into the pressure regulating valve 11 connected to the other end.
For example, the sub pipe 14 may branch from the main pipe 3 and extend to the pressure regulating valve 11 .
For example, one end of the sub-pipe 14 branches off from the main pipe 3 at the ground OG and the other end is may be configured to be connected to the valve element adjusting chamber 111 of the pressure adjusting valve 11 .
For example, the secondary pipe 14 may branch from the main pipe 3 at a first branch point PB1 between the heat exchanger 4 and the pressure regulator 11 .

(Configuration of drain pipe)
A drain pipe 15 branches from the sub pipe 14 between the water injection solenoid valve 12 and the pressure regulating valve 11 .
The drain pipe 15 is configured so that water injected into the sub pipe 14 can be discharged.
For example, the drain pipe 15 may be configured to drain water injected into the sub pipe 14 via the drain electromagnetic valve 13 .
For example, the drain pipe 15 may branch off from the secondary pipe 14 at a second branch point PB2 between the water injection solenoid valve 12 and the pressure regulating valve 11 .
For example, the drain pipe 15 may branch from the secondary pipe 14 so that part of the water flowing in the secondary pipe 14 flows to the drain pipe 15 .

(Structure of check valve)
The check valve 16 is connected to each end of the main pipe 3 in parallel with the pressure regulating valve 11 with respect to the main pipe 3 .
The check valve 16 is provided between the pump 5 and the main pipe 3 so that the direction of water flow between the pump 5 and the main pipe 3 is one-way.

For example, the check valve 16 may be configured to allow water to flow from the pump 5 towards the main pipe 3 and prevent water from flowing from the main pipe 3 towards the pump 5 . At that time, by closing the flow of water in the main pipe 3 from at least the main pipe 3 toward the pump 5, the check valve 16 is configured to be pressurized from the pump 5 toward the main pipe 3, and at least A pressurized closed circuit may be formed while the pressure regulating valve 11 is closed.
Thus, the check valve 16 and the pressure regulating valve 11 serve as switching valves for discharging water pumped from the pump 5 to the main pipe 3 and for discharging water injected from the main pipe 3 into the casing 2 a of the well 2 .

For example, one end of the check valve 16 may be connected to the pump 5 and the other end of the check valve 16 may be connected to the main pipe 3 .
For example, within each well 2 a check valve 16 may be provided on the pressure side of the pump 5 .
For example, within each well 2 , the check valve 16 may be provided above the pump 5 .
For example, the check valve 16 may be formed integrally with the pressure regulating valve 11 .

Here, an example of the relationship between the check valve 16 on the side of the pumping well 21 and the pressure regulating valve 11 on the side of the water injection well 22 will be described.
On the pumped well 21 side, when the pressure applied from the pump 5 toward the main pipe 3 reaches the operating pressure of the check valve 16 , the check valve 16 releases water from the pump 5 toward the main pipe 3 . When the check valve 16 releases the water, working pressure is applied from the pump 5 toward the main pipe 3 .
At this time, the pressure regulating valve 11 on the pumping well 21 side is closed.

On the other hand, on the water injection well 22 side, the set pressure at which the pressure regulating valve 11 releases water from the main pipe 3 toward the well 2 is set to be higher than the operating pressure of the check valve 16 . Therefore, when the pressure applied from the pump 5 toward the main pipe 3 reaches the operating pressure of the check valve 16 , the pressure in the main pipe 3 becomes at least the operating pressure of the check valve 16 .
When the pump 5 on the pumping well 21 side further increases the pressure applied from the pump 5 toward the main pipe 3 , the pressure in the main pipe 3 increases to the set pressure of the pressure regulating valve 11 . When the pressure in the main pipe 3 becomes higher than the set pressure of the pressure regulating valve 11 on the water injection well 22 side, the pressure regulating valve 11 releases the water in the main pipe 3 from the main pipe 3 toward the water injection well 22 as described above. do.
Therefore, if the set pressure of the pressure regulating valve 11 is set to a pressure that can suppress the generation of air bubbles in the stored water, the geothermal heat utilization system 9 can prevent the generation of air bubbles from the water pumped up from the well 21 and stored in the main pipe 3. Water can be injected into the water injection well 22 while suppressing it.

(Composition of pressure sensor)
A pressure sensor 17 detects the pressure in the main pipe 3 .
For example, pressure sensor 17 may output pressure information related to the detected pressure to control valve 18 .
For example, the pressure sensor 17 may be provided in the middle of the main pipe 3 .
For example, the pressure sensor 17 is provided in the main pipe 3 between the control valve 18 and the heat exchanger 4, and may detect the pressure in the main pipe 3 on the side of the heat exchanger 4 from the control valve 18. .
For example, the pressure sensor 17 is provided in the main pipe 3 between the first branch point PB1 and the heat exchanger 4, and detects the pressure in the main pipe 3 on the side of the heat exchanger 4 from the first branch point PB1. You may
For example, pressure sensor 17 may be provided near the lid of well 2 .

(Configuration of control valve)
The control valve 18 can open and close the main pipe 3 and may adjust the pressure in the main pipe 3 .
For example, control valve 18 may be a solenoid valve.

For example, when the pump 5 is started during operation of the geothermal heat utilization system 9, the water injection control system 1 fully opens the control valve 18, fully opens the drain electromagnetic valve 13, and fully closes the water injection electromagnetic valve 12 to adjust. The pressure valve 11 may be opened to allow water injection.
Furthermore, at that time, the pump 5 may perform inverter control to keep the water injection pressure to the well 2 constant, and the water injection control system 1 may adjust the control valve opening of the control valve 18 by pressure constant control.

For example, when the geothermal heat utilization system 9 is stopped, the water injection control system 1 sets the control valve 18 to the previous setting, fully opens the drain electromagnetic valve 13, fully closes the water injection electromagnetic valve 12, The pressure regulating valve 11 may be closed to keep the pressure in the main pipe 3 under pressure.

For example, the control valve 18 may acquire output information such as the inverter frequency of the pump 5 as pressure control information in the main pipe 3 .
For example, the control valve 18 may acquire pressure information related to the pressure detected by the pressure sensor 17 as the pressure control information in the main pipe 3 .
For example, the control valve 18 may be provided in the middle of the main pipe 3 to open and close the flow path of the main pipe 3 .
For example, the control valve 18 may be provided in the main pipe 3 between the pressure regulating valve 11 and the heat exchanger 4 .
For example, the control valve 18 may be provided in the main pipe 3 between the pressure regulating valve 11 and the first branch point PB1.
For example, pressure sensor 17 may be provided near the lid of well 2 .

(Configuration of control device)
As shown in FIG. 3 , the control device 19 includes a first control section 192 and a second control section 193 .
For example, the control device 19 may further include an acquisition unit 191 .

The obtaining unit 191 obtains a command related to opening/closing of the pressure regulating valve 11 .
For example, the acquisition unit 191 may acquire a command to open or close the pressure regulating valve 11 from an operator or another device.
For example, the acquisition unit 191 may acquire a command to open or close the pressure regulating valve 11 based on a sequence pre-stored in the control device 19 .

The first control unit 192 controls the water injection solenoid valve 12 .
For example, the first control unit 192 may send the first control signal SG1 to the water injection solenoid valve 12 .
For example, when the acquisition unit 191 acquires a command to open the pressure regulating valve 11, the first control unit 192 transmits a signal to the water injection solenoid valve 12 as the first control signal SG1 to close the sub pipe 14. may
For example, when the acquiring unit 191 acquires a command to close the pressure regulating valve 11, the first control unit 192 transmits a signal to open the secondary pipe 14 to the water injection solenoid valve 12 as the first control signal SG1. may

The second control section 193 controls the drain solenoid valve 13 .
For example, the second control section 193 may send the second control signal SG2 to the drain solenoid valve 13 .
For example, when the acquisition unit 191 acquires a command to open the pressure regulating valve 11, the first control unit 192 transmits a signal to open the secondary pipe 14 to the drain solenoid valve 13 as the second control signal SG2. may
For example, when the acquisition unit 191 acquires a command to close the pressure regulating valve 11, the first control unit 192 transmits a signal to close the secondary pipe 14 to the drain solenoid valve 13 as the second control signal SG2. may

(Operation of control device)
The operation of the control device 19 of this embodiment will be described.
The operation of the control device 19 corresponds to an embodiment of the control method.
The control device 19 implements each step shown in FIG.

First, the acquisition unit 191 acquires a command related to opening/closing of the pressure regulating valve 11 (ST01: step of acquiring a command).
Following the execution of ST01, the first control section 192 controls the water injection electromagnetic valve 12 (ST02: step of controlling the water injection electromagnetic valve).
Following the execution of ST01, the second control section 193 controls the drain solenoid valve 13 (ST03: step of controlling the drain solenoid valve).
For example, ST02 and ST03 may be performed in parallel.
For example, ST02 and ST03 may be performed at the same time.

(Action and effect)
According to this embodiment, the water injection control system 1 adjusts the pressure regulating valve 11 by the water injection pressure from the sub pipe 14 that is adjusted by the water injection electromagnetic valve 12 and the water discharge electromagnetic valve 13 .
Therefore, the operation of the pressure regulating valve 11 is less likely to be affected by pressure changes in the main pipe 3 .
Therefore, the water injection control system 1 can improve the reliability of water injection control.

Further, according to one example of the present embodiment, since the water injection solenoid valve 12 and the drainage solenoid valve 13 are provided on the ground OG, the operations of the water injection solenoid valve 12 and the drainage solenoid valve 13 can be monitored on the ground OG.
Therefore, it is easy to identify the cause of the trouble, etc., and the maintenance of the water injection control system 1 is facilitated.

Further, according to one example of the present embodiment, since the sub pipe 14 branches from the main pipe 3 and extends to the pressure regulating valve 11, the water injection control system 1 heats the inside of the sub pipe 14 with the water injection pressure from the main pipe 3. can be pressured.
Therefore, the configuration of the water injection control system 1 can be simplified.

Here, as a comparative example, the water injection pressure from the sub-pipe 14 to the pressure regulating valve 11 as shown in FIGS. Take water injection control system 901 . At that time, the water injection control system 901 employs a method in which the pilot valve 950 is operated by the water pressure of the sub pipe 14 .
On the other hand, in the water injection control system 901, when the pressure regulating valve 11 opens, the water pressure in the main pipe 3 and the sub pipe 14 decrease, and when the pressure regulating valve 11 closes, the water pressure in the main pipe 3 and the sub pipe 14 rise.
Therefore, the pressure regulating valve 11 is repeatedly opened and closed, and depending on the case, the pressure regulating valve 11 may not open and the pressure in the main pipe 3 may rise.
On the other hand, according to one example of the present embodiment, although the sub pipe 14 branches from the main pipe 3 as described above, the water injection pressure from the sub pipe 14 is adjusted by the water injection electromagnetic valve 12 and the drainage electromagnetic valve 13. Therefore, the operation of the pressure regulating valve 11 is less likely to be affected by transient pressure changes in the main pipe 3 .

Further, according to one example of the present embodiment, the water injection solenoid valve 12 closes the sub pipe 14 and the drain solenoid valve 13 opens the drain pipe 15, so that the pressure regulating valve 11 is opened. When the pressure regulating valve 11 is not applied, the pressure regulating valve 11 is opened.
Therefore, the water injection control system 1 can open the pressure regulating valve 11 in the activated state before the inside of the sub pipe 14 is pressurized.
Therefore, a transient pressure rise in the main pipe 3 can be suppressed.

Further, according to one example of the present embodiment, the water injection solenoid valve 12 opens the sub pipe 14 and the drain solenoid valve 13 closes the drain pipe 15, so that the pressure regulating valve 11 is closed. The pressure regulating valve 11 is closed when the pressure is applied to the pressure regulating valve 11 .
Therefore, in a steady state after the inside of the sub pipe 14 is pressurized, the water injection control system 1 can close the pressure regulating valve 11 .
Therefore, the water injection control system 1 can stop water injection from the main pipe 3 to the well 2 .

Further, according to one example of the present embodiment, the water injection control system 1 further includes the control valve 18 capable of opening and closing the main pipe 3, so the water injection control system 1 can control the pressure in the main pipe 3 by the control valve 18. .

Further, according to one example of this embodiment, the water injection control system 1 further includes a pressure sensor 17 that detects the pressure in the main pipe 3, and controls the control valve 18 in relation to the detected pressure. The system 1 can control the pressure in the main line 3 based on the detected pressure.

Further, according to one example of the present embodiment, the water injection control system 1 keeps the inside of the main pipe 3 in a pressurized state throughout the opening and closing of the main pipe 3 by the pressure regulating valve 11, so the inside of the main pipe 3 can be pressurized at all times. .
Therefore, it is possible to suppress the generation of flocs such as ferric hydroxide due to oxidation of the water in the well 2 and clogging of the well screen due to air bubbles due to volatile gas in the groundwater.

Further, according to one example of the present embodiment, the geothermal heat utilization system 9 includes a water injection control system 1, a well 2, a main pipe 3, a pump 5 for pumping water from the well 2 to the main pipe 3, and the main pipe 3. With the heat exchanger 4 for heat exchange, the geothermal heat utilization system 9 can exchange heat between the well 2 reservoir and the heat exchanger 4 .
Therefore, the stored water pumped up from the well 2 can be used for heat.

<Modification>
In one example of this embodiment, the water injection solenoid valve 12 closes the sub-pipe 14 and the drain solenoid valve 13 opens the drain pipe 15, thereby opening the pressure regulating valve 11. As long as the water injection from the main pipe 3 to the well 2 can be adjusted, the water injection control system 1 may be configured in any way.
As a modification, for example, when a transient pressure change in the main pipe 3 does not pose a problem, the water injection control system 1 has the water injection solenoid valve 12 open the sub pipe 14 and the drain solenoid valve 13 closes the drain pipe 15. By doing so, the pressure regulating valve 11 may be configured to open.

In one example of this embodiment, the water injection solenoid valve 12 opens the sub pipe 14 and the drain solenoid valve 13 closes the drain pipe 15, so that the pressure regulating valve 11 is closed. As long as the water injection from the main pipe 3 to the well 2 can be adjusted, the water injection control system 1 may be configured in any way.
As a modification, the water injection control system 1 may be configured such that the water injection solenoid valve 12 closes the sub pipe 14 and the drain solenoid valve 13 opens the drain pipe 15 to close the pressure regulating valve 11 .

In one example of the present embodiment, the sub-pipe 14 branches off from the main pipe 3 and extends to the pressure regulating valve 11 . can be constructed in any way.
As a modification, in the water injection control system 1, a pump or the like may be provided in the sub pipe 14, and the water injection pressure applied to the pressure regulating valve 11 may be generated in the sub pipe 14 by the pump or the like provided in the sub pipe 14. good. In this case, one end of the sub-pipe 14 may be separated from the main pipe 3 without branching from the main pipe 3 at the first branch point PB1 so that the water flowing through the main pipe 3 does not flow into the sub-pipe 14. .

In one example of this embodiment, ST02 and ST03 are performed at the same time, but if the water injection pressure from the sub pipe 14 can be adjusted, the water injection electromagnetic valve 12 and the drainage electromagnetic valve 13 may be controlled in any way. .
As a modification, ST03 may be performed following the implementation of ST02.
As another modification, ST02 may be performed following the implementation of ST03.

In each of the above-described embodiments, a program for realizing various functions of the control device 19 is recorded in a computer-readable recording medium, and the program recorded in this recording medium is read into a computer system such as a microcomputer. It is assumed that various processes are performed by setting and executing. Here, various processes of the CPU of the computer system are stored in a computer-readable recording medium in the form of programs, and the above various processes are performed by reading and executing the programs by the computer. Computer-readable recording media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and the like. Alternatively, the computer program may be distributed to a computer via a communication line, and the computer receiving the distribution may execute the program.

In each of the above-described embodiments, an example of the hardware configuration of the computer 190 that executes programs for realizing various functions of the control device 19 will be described.

As shown in FIG. 8, a computer 190 included in the control device 19 includes a processor 195, a memory 196, a storage/reproduction device 197, an Input Output Interface (hereinafter referred to as "IO I/F") 198, and communication and an Interface (hereinafter referred to as “communication I/F”) 199 .

For example, processor 195 may be a CPU.
For example, the memory 196 may be a medium such as a Random Access Memory (hereinafter referred to as “RAM”) that temporarily stores data used by programs executed by the control device 19 .
For example, the storage/playback device 197 may be a device for storing data or the like in external media such as a CD-ROM, DVD, or flash memory, or playing back data or the like from the external media.
For example, the IO I/F 198 may be an interface for inputting/outputting information between the control device 19 and another device.
For example, the communication I/F 199 may be an interface that performs communication between the control device 19 and another device via a communication line such as the Internet or a dedicated communication line.

<Other embodiments>
Although the embodiment of the present disclosure has been described above, this embodiment is shown as an example and is not intended to limit the scope of the present disclosure. This embodiment can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the gist of the present disclosure. This embodiment and its modifications are intended to be included in the scope and equivalents of the present disclosure as well as included in the scope and gist of the present disclosure.

<Appendix>
The water injection control system, the geothermal heat utilization system, the control device, the control method, and the program described in the above embodiments are grasped as follows, for example.

(1) The water injection control system 1 according to the first aspect includes a pressure regulating valve 11 that adjusts water injection into the well 2 from the main pipe 3 extending inside the well 2 in relation to the water injection pressure from the sub pipe 14, A water injection solenoid valve 12 that adjusts water injection into the sub pipe 14, and a drain solenoid valve 13 that adjusts drainage from the sub pipe 14 to a drain pipe 15 branching between the water injection solenoid valve 12 and the pressure regulating valve 11. , provided.

According to this aspect, the water injection control system 1 adjusts the pressure regulating valve 11 by the water injection pressure from the sub pipe 14 that is adjusted by the water injection electromagnetic valve 12 and the water discharge electromagnetic valve 13 .
Therefore, the operation of the pressure regulating valve 11 is less likely to be affected by transient pressure changes in the main pipe 3 .
Therefore, the water injection control system 1 can improve the reliability of water injection control.

(2) The water injection control system 1 according to the second aspect is the water injection control system 1 of (2) in which the water injection electromagnetic valve 12 and the drainage electromagnetic valve 13 are provided on the ground OG.

According to this aspect, the water injection control system 1 can monitor the operation of the water injection electromagnetic valve 12 and the drainage electromagnetic valve 13 on the ground OG.
Therefore, it is easy to identify the cause of the trouble, etc., and the maintenance of the water injection control system 1 is facilitated.

(3) A water injection control system 1 according to a third aspect is the water injection control system 1 of (1) or (2) in which the sub pipe 14 branches from the main pipe 3 and extends to the pressure regulating valve 11 .

According to this aspect, the water injection control system 1 can pressurize the inside of the sub pipe 14 with the water injection pressure from the main pipe 3 .
Therefore, the configuration of the water injection control system 1 can be simplified.

(4) In the water injection control system 1 according to the fourth aspect, the water injection electromagnetic valve 12 closes the sub pipe 14 and the drain electromagnetic valve 13 opens the drain pipe 15, thereby opening the pressure regulating valve 11 (1) to ( The water injection control system 1 according to any one of 3).

According to this aspect, the pressure regulating valve 11 opens when the injection pressure from the sub pipe 14 is not applied to the pressure regulating valve 11 .
Therefore, the water injection control system 1 can open the pressure regulating valve 11 in the activated state before the inside of the sub pipe 14 is pressurized.
Therefore, a transient pressure rise in the main pipe 3 can be suppressed.

(5) In the water injection control system 1 according to the fifth aspect, the water injection electromagnetic valve 12 opens the sub pipe 14 and the drain electromagnetic valve 13 closes the drain pipe 15, thereby closing the pressure regulating valve 11 (1) to ( The water injection control system 1 according to any one of 4).

According to this aspect, the pressure regulating valve 11 is closed when the injection pressure from the sub pipe 14 is applied to the pressure regulating valve 11 .
Therefore, in a steady state after the inside of the sub pipe 14 is pressurized, the water injection control system 1 can close the pressure regulating valve 11 .
Therefore, the water injection control system 1 can stop water injection from the main pipe 3 to the well 2 .

(6) A water injection control system 1 according to a sixth aspect is the water injection control system 1 according to any one of (1) to (5), further including a control valve 18 capable of opening and closing the main pipe 3 .

According to this aspect, the water injection control system 1 can control the pressure in the main pipe 3 with the control valve 18 .

(7) The water injection control system 1 according to the seventh aspect further includes a pressure sensor 17 that detects the pressure in the main pipe 3, and controls the control valve 18 in relation to the detected pressure. A control system 1 .

According to this aspect, the water injection control system 1 can control the pressure in the main pipe 3 based on the detected pressure.

(8) The geothermal heat utilization system 9 according to the eighth aspect includes the water injection control system 1 according to any one of (1) to (7), the well 2, the main pipe 3, and from the well 2 to the main pipe 3 A pump 5 for pumping water and a heat exchanger 4 for exchanging heat with the main pipe 3 are provided.

According to this aspect, the geothermal heat utilization system 9 can exchange heat between the water stored in the well 2 and the heat exchanger 4 .
Therefore, the stored water pumped up from the well 2 can be used for heat.

(9) The control device 19 according to the ninth aspect includes a first control unit 192 that controls the water injection solenoid valve 12 that adjusts water injection into the sub pipe 14, the water injection solenoid valve 12 from the sub pipe 14, and the sub pipe In relation to the water injection pressure from 14, the pressure regulating valve 11 that adjusts the water injection from the main pipe 3 extending inside the well 2 to the well 2 and the drainage that adjusts the drainage to the drain pipe 15 branched between and a second control unit 193 that controls the solenoid valve 13 .

According to this aspect, the control device 19 adjusts the pressure regulating valve 11 by the water injection pressure from the sub pipe 14 that is adjusted by the water injection electromagnetic valve 12 and the water discharge electromagnetic valve 13 .
Therefore, the operation of the pressure regulating valve 11 is less likely to be affected by transient pressure changes in the main pipe 3 .
Therefore, the control device 19 can improve the reliability of water injection control.

(10) The control method according to the tenth aspect controls the water injection solenoid valve 12 that adjusts water injection into the sub pipe 14, and controls the water injection solenoid valve 12 from the sub pipe 14 and the water injection pressure from the sub pipe 14. Then, it controls the pressure regulating valve 11 that adjusts the water supply to the well 2 from the main pipe 3 extending inside the well 2 and the drain solenoid valve 13 that adjusts the drainage to the drain pipe 15 branched between them.

According to this aspect, the control method adjusts the pressure regulating valve 11 by the water injection pressure from the sub pipe 14 that is adjusted by the water injection electromagnetic valve 12 and the water discharge electromagnetic valve 13 .
Therefore, the operation of the pressure regulating valve 11 is less likely to be affected by transient pressure changes in the main pipe 3 .
Therefore, the control method can improve the reliability of water injection control.

(11) A program according to the eleventh aspect causes a computer to control a water injection solenoid valve that adjusts water injection into a sub pipe, and relates to the water injection solenoid valve from the sub pipe and the water injection pressure from the sub pipe. Then, a method of controlling a drain electromagnetic valve for adjusting water discharge to a drain pipe branched between a pressure regulating valve for adjusting water injection into the well from a main pipe extending inside the well is executed.

According to this aspect, the computer on which the program is executed adjusts the pressure regulating valve 11 by the water injection pressure from the sub pipe 14 that is adjusted by the water injection electromagnetic valve 12 and the water discharge electromagnetic valve 13 .
Therefore, the operation of the pressure regulating valve 11 is less likely to be affected by transient pressure changes in the main pipe 3 .
Therefore, the program can increase the reliability of water injection control.

1 Water injection control system 2 Well 2a Casing 2b Strainer 3 Main pipe 4 Heat exchanger 5 Pump 9 Geothermal heat utilization system 11 Pressure regulating valve 12 Water injection solenoid valve 13 Drainage solenoid valve 14 Subpipe 15 Drainage pipe 16 Check valve 17 Pressure sensor 18 Control valve 19 Control device 21 Pumping well 22 Injection well 111 Valve body adjustment chamber 112 Valve body 113 Flow path 190 Computer 191 Acquisition unit 192 First control unit 193 Second control unit 195 Processor 196 Memory 197 Storage/playback device 198 IO I/ F.
199 Communication I/F
901 Water injection control system 950 Pilot valve HOL Borehole LY Aquifer OG Ground PB1 First branch point PB2 Second branch point SG1 First control signal SG2 Second control signal

Claims (11)

a pressure regulating valve connected to the other end of a sub-pipe into which water is injected at one end, and which adjusts water injection into the well from the main pipe extending inside the well in relation to the water injection pressure from the sub-pipe;
a water injection solenoid valve provided in the middle of the secondary pipe for opening and closing a channel of the secondary pipe ;
a drain solenoid valve for adjusting drain water from the sub pipe to a drain pipe branching between the water injection solenoid valve and the pressure regulating valve;
with
The water injection pressure is configured to occur in the secondary pipe,
The water injection pressure is the water injection pressure from the secondary pipe to the pressure regulating valve,
the pressure regulating valve is inside the well;
The pressure regulating valve comprises a valve body adjusting chamber and a valve body,
A water injection control system , wherein the pressure regulating valve is configured to open and close the valve body in relation to a water injection pressure and a set pressure in the valve body adjustment chamber . The water injection control system according to claim 1, wherein the water injection solenoid valve and the water discharge solenoid valve are provided on the ground. 3. The water injection control system according to claim 1, wherein the secondary pipe branches from the main pipe and extends to the pressure regulating valve. The water injection control system according to any one of claims 1 to 3, wherein the water injection solenoid valve closes the sub pipe and the drain solenoid valve opens the drain pipe, thereby opening the pressure regulating valve. The water injection control system according to any one of claims 1 to 4, wherein the water injection solenoid valve opens the sub pipe and the drain solenoid valve closes the drain pipe, thereby closing the pressure regulating valve. The water injection control system according to any one of claims 1 to 5, further comprising a control valve provided in the middle of the main pipe and capable of opening and closing the main pipe. Further comprising a pressure sensor that detects the pressure in the main pipe,
7. The water injection control system of claim 6, wherein the control valve is controlled in relation to the sensed pressure. A water injection control system according to any one of claims 1 to 7;
the well;
the main pipe;
a pump for pumping water from the well to the main pipe;
a heat exchanger that exchanges heat with the main pipe;
geothermal heat utilization system. a first control unit that controls a water injection electromagnetic valve that is provided in the middle of a sub-pipe into which water is injected at one end and that opens and closes the flow path of the sub-pipe;
The auxiliary pipe is connected to the water injection solenoid valve and the other end of the sub pipe, and is connected to the water injection pressure from the sub pipe to adjust the water injection from the main pipe extending into the well into the well. a pressure valve, a second control unit that controls a drain solenoid valve that adjusts the drain to the drain pipe branched between;
with
The water injection pressure is configured to occur in the secondary pipe,
The water injection pressure is the water injection pressure from the secondary pipe to the pressure regulating valve,
the pressure regulating valve is inside the well;
The pressure regulating valve comprises a valve body adjusting chamber and a valve body,
The control device , wherein the pressure regulating valve is configured to open and close the valve body in relation to the water injection pressure and the set pressure in the valve body adjusting chamber . Controlling a water injection electromagnetic valve that is provided in the middle of a sub-pipe that is injected with water at one end and opens and closes the flow path of the sub-pipe,
The auxiliary pipe is connected to the water injection solenoid valve and the other end of the sub pipe, and is connected to the water injection pressure from the sub pipe to adjust the water injection from the main pipe extending into the well into the well. Control the drainage solenoid valve that adjusts the drainage to the drainage pipe branching between the pressure valve ,
The water injection pressure is configured to occur in the secondary pipe,
The water injection pressure is the water injection pressure from the secondary pipe to the pressure regulating valve,
the pressure regulating valve is inside the well;
The pressure regulating valve comprises a valve body adjusting chamber and a valve body,
The control method , wherein the pressure regulating valve is configured to open and close the valve body in relation to the water injection pressure and the set pressure in the valve body adjusting chamber . to the computer,
Controlling a water injection electromagnetic valve that is provided in the middle of a sub-pipe that is injected with water at one end and opens and closes the flow path of the sub-pipe,
The auxiliary pipe is connected to the water injection solenoid valve and the other end of the sub pipe, and is connected to the water injection pressure from the sub pipe to adjust the water injection from the main pipe extending into the well into the well. Control the drainage solenoid valve that adjusts the drainage to the drainage pipe branching between the pressure valve ,
The water injection pressure is configured to occur in the secondary pipe,
The water injection pressure is the water injection pressure from the secondary pipe to the pressure regulating valve,
the pressure regulating valve is inside the well;
The pressure regulating valve comprises a valve body adjusting chamber and a valve body,
The pressure regulating valve is configured to open and close the valve body in relation to the water injection pressure and the set pressure in the valve body adjusting chamber.
A program for executing a method.

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