JP7287367B2 - Binary geothermal power generation system - Google Patents

Description

The present invention relates to a binary geothermal power generation system.

A binary geothermal power generation system, as exemplified in the background art of Patent Document 1, for example, heat-exchanges a geothermal fluid extracted from a production well with a low-boiling-point medium, and uses the steam generated thereby to generate a binary turbine. to generate electricity.

FIG. 10 is a diagram showing the configuration of a general binary geothermal power generation system 43. As shown in FIG. In FIG. 10, 3 is a steam-water separator for separating the geothermal fluid collected from the production well, 5 is a low-boiling medium (butane , hydrocarbons such as pentane), 7 is a preheater that exchanges heat between the hot water separated by the steam separator 3 and the low boiling point medium to preheat the low boiling point medium, and 9 is the evaporator 5. 11 is a generator driven by the binary turbine 9; 13 is a cooling tower (air cooling) that cools and liquefies the steam discharged from the binary turbine 9; 15 is a circulation line. A circulation pump 16 is provided to circulate the liquefied low boiling point medium, and 17 is a reinjection water pump to return the hot water heat-exchanged in the preheater 7 to the reinjection well.

In the binary geothermal power generation system 43 configured as described above, the geothermal fluid collected from the production well is separated into hot water and steam by the steam separator 3, and the steam is sent to the evaporator 5, Hot water is sent to the preheater 7 .
On the other hand, the low boiling point medium circulates through a circulation line 16 by a circulation pump 15, is preheated by a preheater 7, is converted into steam by an evaporator 5, and is introduced into a binary turbine 9. When the turbine 9 is driven, the generator 11 is driven to generate power.
The steam supplied to the binary turbine 9 is liquefied by the cooling tower 13 and supplied to the preheater 7 by the circulation pump 15 .
The water vapor is condensed by heat exchange in the evaporator 5 to become hot water, and is supplied to the preheater 7 together with the hot water supplied from the steam-water separator 3 to preheat the low-boiling-point medium. returned to the well.

FIG. 10 shows an example of the flow rate, temperature, etc. of hot water, etc. in the middle of the system when the geothermal fluid of the dimensionless flow rate (1) is sampled from the production well.
The geothermal fluid is separated into steam with a flow rate of 0.162, a temperature of 130°C and a pressure of 0.3 MPa, and hot water with a flow rate of 0.838, a temperature of 130°C and a pressure of 0.3 MPa. The water and hot water supplied to the preheater 7 become reduced water having a flow rate (1) and a temperature of 100° C., which is pressurized to 0.4 MPa by a reduced water pump 17 and returned to the injection well.

Japanese Patent Application Laid-Open No. 2018-53738

In the binary geothermal power generation system 43 as described above, power is required for the reduced water pump 17 driven by the electric motor, and the amount of power supplied to the outside is reduced by the power consumption.
In addition, geothermal fluid generally contains silica, calcium, etc., which tend to precipitate when the temperature is low. It adheres to the surface and becomes flow path resistance, causing an increase in transport power and a decrease in the amount taken into the injection well. As a result, steam and hot water cannot be produced as planned, resulting in lower power output and lower economic efficiency of the geothermal power plant.

For example, if the silica concentration of the geothermal fluid is less than 390 mg/L, operation can be performed without silica precipitation if the reduced water temperature is 100°C. It is necessary to keep the temperature above about 100°C, but in this case, the geothermal energy of the hot water cannot be fully utilized, resulting in poor energy utilization efficiency.
Furthermore, even if the temperature of the reduced water is 100°C or higher, depending on the properties of the produced geothermal fluid, it may contain silica that exceeds the solubility of silica in the reduced water. cause problems.

The present invention has been made to solve such problems, and is a binary type that eliminates the need for a reduced water pump or suppresses the power consumption of the reduced water pump and prevents the precipitation of silica and the like to effectively utilize geothermal energy. The purpose is to provide a geothermal power generation system.

(1) The binary geothermal power generation system according to the present invention separates the geothermal fluid collected from the production well into steam and hot water by the steam-water separator, and the separated steam and/or hot water is transferred to the evaporator. and heat exchange with a low boiling point medium by means of the steam generated by the low boiling point medium is used to drive a binary turbine to generate electricity, and the separated hot water is returned to the reinjection well as reductive water. ,
A steam injector is provided in a reduced water line for returning the reduced water to the reduction well, and a part of the steam separated by the steam separator and the reduced water are introduced into the steam injector to increase the temperature of the reduced water. It is characterized by increasing the pressure and returning it to the injection well.

(2) In the above (1), a first flow control valve for adjusting the flow rate of the geothermal fluid extracted from the production well, and a second flow control valve for adjusting the flow rate of the steam supplied to the steam injector. a valve;
A first flow rate detection device for detecting a flow rate of steam supplied to the evaporator side or another steam utilization side, a second flow rate detection device for detecting a flow rate of steam supplied to the steam injector, and a supply to the steam injector. a third flow rate detection device for detecting the flow rate of the reducing water to
A first temperature detection device for detecting the temperature of steam supplied to the steam injector, a second temperature detection device for detecting the temperature of the reduced water supplied to the steam injector, and the temperature of the reduced water discharged from the steam injector. a third temperature detection device that detects
a second pressure detection device for detecting the pressure of the reduced water supplied to the steam injector; a third pressure detection device for detecting the pressure of the reduced water discharged from the steam injector; a fourth pressure sensing device for sensing;
a power detection device that detects power generated by the turbine;
Among the steam separated by the steam separator, the distribution ratio of the steam supplied to the evaporator or other steam utilization side and the steam amount flowing into the steam injector, the production increase ratio of the production well, and the binary power output increase ratio relationship, analytical value of silica concentration contained in geothermal fluid, ratio of steam to hot water in geothermal fluid, design specification of binary generator and steam injector;
The flow rate of the geothermal fluid for inputting the detection signal of each detection device and obtaining the required power generation output based on the information stored in the database, and for preventing silica from being precipitated by the reduced water, or silica A control device for calculating the flow rate of steam supplied to the steam injector required to suppress the deposition of It is characterized by

(3) In addition, in the above (1), a first flow control valve for adjusting the flow rate of the geothermal fluid extracted from the production well, and a second flow control valve for adjusting the flow rate of the steam supplied to the steam injector. a valve;
A first flow rate detection device for detecting a flow rate of steam supplied to the evaporator side or another steam utilization side, a second flow rate detection device for detecting a flow rate of steam supplied to the steam injector, and a supply to the steam injector. a third flow rate detection device for detecting the flow rate of the reducing water to
a second temperature detection device for detecting the temperature of the reduced water supplied to the steam injector; a third temperature detection device for detecting the temperature of the reduced water discharged from the steam injector;
A first pressure detection device for detecting the pressure of steam supplied to the steam injector, a second pressure detection device for detecting the pressure of the reduced water supplied to the steam injector, and the pressure of the reduced water discharged from the steam injector. a third pressure sensing device that senses the pressure of the throat portion of the steam injector; a fourth pressure sensing device that senses
a power detection device that detects power generated by the turbine;
Among the steam separated by the steam separator, the distribution ratio of the steam supplied to the evaporator or other steam utilization side and the steam amount flowing into the steam injector, the production increase ratio of the production well, and the binary power output increase ratio relationship, analytical value of silica concentration contained in geothermal fluid, ratio of steam to hot water in geothermal fluid, design specification of binary generator and steam injector;
The flow rate of the geothermal fluid for inputting the detection signal of each detection device and obtaining the required power generation output based on the information stored in the database, and for preventing silica from being precipitated by the reduced water, or silica A control device for calculating the flow rate of steam supplied to the steam injector required to suppress the deposition of It is characterized by

(4) The binary geothermal power generation system according to the present invention uses an evaporator to heat-exchange steam, which is a geothermal fluid collected from a production well, with a low-boiling-point medium, and uses the steam of the low-boiling-point medium produced thereby. A binary geothermal power generation system that drives a binary turbine to generate power and returns condensed water, which is water vapor condensed by the evaporator, to a reinjection well as reinjection water,
A steam injector is provided in the reduced water line for returning the reduced water to the reduction well, and part of the steam, which is the geothermal fluid, and the reduced water are introduced into the steam injector to increase the temperature and pressure of the reduced water. It is characterized by returning to the injection well.

In the present invention, a steam injector is provided in the reducing water line for returning the reducing water to the reducing well. By raising the water and returning it to the reinjection well, it is possible to eliminate the need for a reinjection water pump or suppress the power consumption of the reinjection water pump, and prevent deposition of silica and the like, thereby effectively utilizing geothermal energy.

1 is an explanatory diagram illustrating the configuration of a binary geothermal power generation system according to an embodiment; FIG. FIG. 2 is an explanatory diagram of a steam injector used in the binary geothermal power generation system shown in FIG. 1; FIG. 4 is an explanatory diagram of another aspect of the binary geothermal power generation system according to the present embodiment (No. 1); 1 is a graph showing a solubility curve of silica in water; FIG. 2 is an explanatory diagram of another aspect of the binary geothermal power generation system according to the present embodiment (No. 2); FIG. 3 is an explanatory diagram of another aspect of the binary geothermal power generation system according to the present embodiment (No. 3); FIG. 4 is an explanatory diagram of another aspect of the binary geothermal power generation system according to the present embodiment (No. 4); 1 is an explanatory diagram of Example 1 of a binary geothermal power generation system according to the present embodiment; FIG. FIG. 6 is an explanatory diagram of Example 2 of the binary geothermal power generation system according to the present embodiment; FIG. 2 is an explanatory diagram illustrating the configuration of a conventional binary geothermal power generation system;

A binary geothermal power generation system according to this embodiment will be described with reference to FIG. In FIG. 1, parts common to those in FIG. 10 explaining the conventional example are denoted by the same reference numerals, and explanations thereof are omitted.

In the binary geothermal power generation system 1 according to the present embodiment, the geothermal fluid collected from the production well is separated into steam and hot water by the steam separator 3, and the separated steam and hot water are treated as a low boiling point medium. (hydrocarbons such as butane and pentane), and the steam generated thereby is used to drive the binary turbine 9 to generate electricity, and the separated hot water is returned to the reinjection well as reinjection water. .
A steam injector 21 is provided in the reducing water line 19 for returning the reducing water to the reducing well. And the pressure is increased to return it to the injection well.
This embodiment is characterized in that a steam injector 21 is provided in the return water line 19 for returning the return water to the return well, so the configuration and operation of the steam injector 21 will be described below.

<Steam injector>
The steam injector 21 is generally a device that mixes steam with a liquid flow and transfers its heat and momentum to obtain a jet liquid having a higher temperature and higher pressure than the introduced liquid pressure.
As shown in FIG. 2, the steam injector 21 includes a cylindrical reduced water supply portion 23 to which reduced water is supplied, and a steam supply portion 25 provided to cover the reduced water supply portion 23 and to which steam is supplied. , a mixing portion 27 where the reducing water and steam are mixed, a throat portion 29 downstream of the mixing portion 27 with a reduced diameter, and a diffuser portion 31 with an enlarged diameter downstream of the throat portion 29 .

In the steam injector 21 configured as described above, when the reduced water is supplied to the reduced water supply section 23 and the steam is supplied to the steam supply section 25, the steam and the reduced water come into contact with each other in the mixing section 27 and the steam is condensed. As the pressure inside the steam injector 21 (the mixing section 27) decreases due to the condensation of the steam, an action of sucking the reduced water and the steam occurs.

When the water vapor is sucked, it becomes a high-speed flow, and this kinetic energy is transferred to the reduced water to accelerate the reduced water (mixed water). In addition, contact between the water vapor and the reduced water causes the water vapor to condense, and the temperature of the reduced water rises. After the reducing water (mixed water) passes through the throat portion 29, the flow velocity decreases in the diffuser portion 31 having an enlarged diameter, whereby the pressure is recovered and the reducing water (mixed water) is discharged at a raised pressure.

As described above, by providing the steam injector 21 in the reduced water line 19, the water pressure of the reduced water can be increased by the steam injector 21. Therefore, the reduced water pump 17 becomes unnecessary, or the reduced water pump 17 is not required. Power can be reduced.
In addition, the steam injector 21 brings the reduced water into contact with steam, thereby increasing the temperature of the reduced water and preventing the deposition of silica and the like.
A specific example of the pressure increase and temperature increase of the reducing water will be described later in Examples.

The steam injector 21 described above is provided so that the steam supply part 25 covers the reducing water supply part 23, but the invention is not limited to this. It is sufficient that they have a structure in which they flow out in the same direction. For example, contrary to what has been described above, the reduced water supply section 23 may be provided so as to cover the cylindrical steam supply section 25 .

In addition, in order to make it easier for the fluid inside the steam injector 21 to flow out when the steam injector 21 is activated, a drain pipe 33 is provided at the throat portion 29 or its upstream side, and the fluid is made to flow only in the direction of flowing out from the steam injector 21 into the drain pipe 33. An on-off valve such as a check valve 35 may be provided. By doing so, the effect of facilitating start-up of the steam injector 21 can be obtained.

In the geothermal power generation system 1 of the above embodiment, the steam injector 21 uses part of the primary steam separated by the steam separator 3, so the amount of steam used in the binary geothermal power generation system is reduced. , the power generation output decreases accordingly.
In this regard, in order to make the power output the same as when the steam injector 21 is not used, the production increase ratio of the production well should be controlled to compensate for the thermal energy from the increased production of geothermal fluid.
A control method for using a portion of the primary steam in the steam injector 21 while maintaining the power output at the same level or at any required power output in this manner will be described with reference to FIG.

As an example of the device configuration in this case, as shown in FIG. A line for supplying steam to the steam injector 21 is provided with a second flow control valve 39 for adjusting the amount of steam, and a controller 41 for controlling the first flow control valve 37 and the second flow control valve 39 is provided.
In FIG. 3, F1 to F3, T1 to T3, P1 to P4, and W indicate a flow rate detection device, a temperature detection device, a pressure detection device, and a power detection device, respectively. Input to the device 41 .

The details of each detection device are as follows.
F1: First flow rate detection device for detecting the flow rate of steam supplied to the evaporator 5 side F2: Second flow rate detection device for detecting the flow rate of steam supplied to the steam injector 21 F3: Reduced water supplied to the steam injector 21 Third flow rate detection device for detecting flow rate T1: First temperature detection device for detecting temperature of steam supplied to steam injector 21 T2: Second temperature detection device for detecting temperature of reduced water supplied to steam injector 21 T3: Third temperature detector for detecting the temperature of the reducing water discharged from the steam injector 21 P1: First pressure detector for detecting the pressure of steam supplied to the steam injector 21 P2: Pressure of the reducing water supplied to the steam injector 21 P3: Third pressure detector that detects the pressure of the reduced water discharged from the steam injector 21 P4: Fourth pressure detector that detects the pressure at the throat of the steam injector 21 W: Binary Power Detection Device for Detecting Power Generated by Turbine 9 Although both T1 and P1 are shown in FIG. 3, only one of them may be installed. This is because the steam separated from the steam separator 3 is saturated steam, and the saturated steam table can be used to uniquely calculate one of the detected values of temperature and pressure from the detected value of the other.

In addition, the distribution ratio between the amount of steam supplied to the evaporator 5 side and the amount of steam flowing into the steam injector 21 in the steam separated by the steam separator 3, the production increase ratio of the production well, and the increase ratio of the binary power generation output relationship, geothermal fluid properties (silica concentration analysis value contained in geothermal fluid, ratio of steam and hot water in geothermal fluid, temperature, pressure, etc.), design specifications of binary power generator and steam injector 21, etc. Information on equipment and the like is stored in the control device 41 as a database.
A pressure detection device provided in the steam injector 21 detects the pressure of the throat portion (throat portion 29 ) of the steam injector 21 .

By providing the device configuration as described above, the detection signal of each device is input to the control device 41, and the control device 41 determines the amount of water vapor to be supplied to the steam injector 21 based on the input detection signal and database information. Alternatively, the required geothermal fluid flow rate is calculated, and the first flow control valve 37 and/or the second flow control valve 39 are controlled based on the calculation result.

A specific example of such control will be described below. The purpose of this control is to raise the temperature of the reduced water to a temperature at which silica or the like does not precipitate, and to control the first flow control valve 37 and/or the second flow control valve 39 so as to obtain the required power generation output. is.
First, the silica concentration of the reduced water is calculated from the silica concentration analysis value of the geothermal fluid. Reduced water is the separation of water vapor from the geothermal fluid and is enriched in silica relative to the geothermal fluid. Therefore, the flow rate ratio of the geothermal fluid and the reduced water is calculated based on the flow rate of the steam and the reduced water measured by the flow rate detector, and the concentration of silica in the concentrated reduced water is calculated. Next, the saturation temperature of the silica concentration in the reducing water is calculated from the solubility curve of silica in water, an example of which is shown in FIG. Calculate quantity. Based on this, the ratio between the amount of steam supplied to the steam injector 21 and the flow rate of the reducing water is calculated. Also, based on this calculated value and the specification of the steam injector 21, the injector outlet maximum discharge pressure is calculated.

From the maximum discharge pressure of the injector outlet, the ratio between the steam supplied to the steam injector 21 and the flow rate of the reducing water, and the ratio of the steam to the hot water of the geothermal fluid produced from the production well, the steam injector 21 pressurizes and reduces the Calculate the possible production increase range of production wells. The production increase possible range here means the increase in production relative to the production well (1) in the case where the steam injector shown in FIG. 10 is not used as a reference.

A possible power generation output range is calculated based on the calculated possible increase in production range of the production well, and the power generation output is determined within this possible power generation output range. The power output to be determined is, for example, the power output required according to the power demand situation, the power output when the steam injector 21 is not used, or the like.
The first flow regulating valve 37 is controlled so as to achieve the determined power generation output to increase the production of geothermal fluid. At the same time, the flow rate of steam flowing into the steam injector 21 is controlled by the second flow control valve 39 so that the flow rate ratio of the steam to the reducing water in the steam injector 21 becomes the calculated value described above.

In the above description, the silica concentration of the reduced water is calculated, and the temperature of the reduced water is raised to the saturation temperature at that silica concentration to control the silica so that it does not precipitate, but a certain amount of precipitation is allowed. In such a case, the amount of temperature rise may be adjusted to suppress silica precipitation by a predetermined ratio. A method of calculating the amount of temperature increase in this case is shown below.

A ratio of suppressing silica deposition (hereinafter referred to as "suppression rate") is set in advance (for example, if the amount of silica deposition is to be reduced by 30%, the suppression rate is set to 0.3).
When the saturation concentration of the reducing water to be targeted for achieving the above suppression rate is defined as the "target saturation concentration", the suppression rate can be defined by the following equation (1).
Suppression rate = (target saturation concentration - saturation concentration at reduced water temperature)
/ (reduced water silica concentration - saturated concentration at reduced water temperature) (1)

After obtaining the silica concentration of the reduced water as described above, the saturated concentration at the reduced water temperature is calculated from the solubility curve of silica in water (see FIG. 4), and the target saturated concentration is calculated based on the above formula (1). . Further, from the solubility curve of silica in water, the amount of temperature rise of the reduced water required to achieve the calculated target saturation concentration is calculated. Based on this, the ratio between the amount of primary steam supplied to the steam injector 21 and the flow rate of the reduced water is calculated. By controlling the amount of steam flowing into the steam injector 21 with the second flow control valve 39 based on the calculated value, silica deposition can be suppressed by a predetermined ratio.

In the above description, the steam separated by the steam separator 3 is supplied to the evaporator 5, but the binary geothermal power generation system of the present invention is not limited to this, and is shown in FIG. As shown, the hot water separated by the steam separator 3 may be supplied to the evaporator 5 . In this case, the steam separated by the steam separator 3 is supplied to the steam injector 21 and other steam-using side, such as a flash power generator.

In the case shown in FIG. 5, the device configuration in the case of control in which a part of the primary steam is used by the steam injector 21 while the power generation output remains the same or is set to an arbitrary power generation output as required is shown in FIG. The specific operations and the like are the same as those described with reference to FIG.
In addition, in the example of FIG. 6, F1 is provided in the line on the other steam utilization side.

In the examples shown in FIGS. 1, 3, 5 and 6, the geothermal fluid collected from the production well is separated into steam and hot water by the steam separator 3. In the case where the fluid does not accompany hot water and consists essentially of steam, as shown in FIG. good. In this case, a steam injector 21 is provided in the return water line 19 for returning condensed water, which is condensed by the evaporator 5, to the return well as return water. to raise the temperature and pressure of the reinjection water and return it to the reinjection well.
Since the condensed water obtained by condensing the steam has a low silica concentration, it is not necessary to actively suppress silica deposition. The reduced water pump 17 becomes unnecessary, or the power of the reduced water pump 17 can be reduced.

FIG. 8 shows an application example of the steam injector when the production of steam/hot water is increased by 10% in the case shown in FIG.
By introducing steam with a non-dimensional flow rate (0.021) and hot water with a non-dimensional flow rate (1.079) into the steam injector 21, the temperature of the reducing water can be raised by 10.degree. Silica solubility at 100℃ is about 390mg/L and silica solubility at 110℃ is about 420mg/L. Although 30 mg of silica was deposited, it is no longer deposited due to the application of the steam injector 21 .

If the silica concentration of the produced geothermal fluid is 420 mg/L or more, silica will precipitate even if the steam injector 21 is applied. Additional excavation costs for reinjection wells due to reduction and extension of usage period are reduced. In addition, since the outlet pressure of the steam injector 21 can be made higher than the pressure of the steam separator 3, the pump power for transporting the return water to the return well is reduced.

As another application example, FIG. 9 shows an operation example when the hot water temperature at the outlet of the preheater is 80°C.
In this example, the flow rate of the steam flowing into the evaporator 5 is reduced by the amount of steam introduced into the steam injector 21, but since the hot water is utilized up to 80°C in the preheater 7, the power output is the same. Become.
Also in this example, at the outlet of the steam injector 21, the temperature of the reducing water can be increased to 100° C. and the discharge pressure can be raised to 0.6 MPa, so the pump power for transporting the reducing water to the injection well can be reduced.

As shown in the above embodiment, by applying the steam injector 21 to the binary power generation system, it is possible to suppress scale formation in the return well by heating the return water, and reduce pump power by increasing the pressure of the return water (supply to the outside). (Increase in the amount of power that can be generated) can be expected.

1 Binary Geothermal Power Generation System 3 Steam Separator 5 Evaporator 7 Preheater 9 Binary Turbine 11 Generator 13 Cooling Tower 15 Circulation Pump 16 Circulation Line 17 Reduced Water Pump 19 Reduced Water Line 21 Steam Injector 23 Reduced Water Supply Section 25 Steam Supply part 27 Mixing part 29 Throat part 31 Diffuser part 33 Drain pipe 35 Check valve 37 First flow control valve 39 Second flow control valve 41 Control device 43 Binary geothermal power generation system (conventional example)
F1 First flow detector F2 Second flow detector F3 Third flow detector T1 First temperature detector T2 Second temperature detector T3 Third temperature detector P1 First pressure detector P2 Second pressure detector P3 Third 3 pressure detector P4 4th pressure detector W power detector

Claims (4)

Geothermal fluid collected from a production well is separated into steam and hot water by a steam-water separator, and the separated steam and/or hot water is heat-exchanged with a low-boiling-point medium by an evaporator. A binary geothermal power generation system in which the steam of the low boiling point medium is used to drive a binary turbine to generate power, and the separated hot water is returned to the reinjection well as reinjection water,
A steam injector is provided in a reduced water line for returning the reduced water to the reduction well, and a part of the steam separated by the steam separator and the reduced water are introduced into the steam injector to increase the temperature of the reduced water. A binary geothermal power generation system characterized in that the pressure is increased and returned to a reinjection well. a first flow control valve that adjusts the flow rate of geothermal fluid extracted from a production well; a second flow control valve that adjusts the flow rate of steam supplied to the steam injector;
A first flow rate detection device for detecting a flow rate of steam supplied to the evaporator side or another steam utilization side, a second flow rate detection device for detecting a flow rate of steam supplied to the steam injector, and a supply to the steam injector. a third flow rate detection device for detecting the flow rate of the reducing water to
A first temperature detection device for detecting the temperature of steam supplied to the steam injector, a second temperature detection device for detecting the temperature of the reduced water supplied to the steam injector, and the temperature of the reduced water discharged from the steam injector. a third temperature detection device that detects
a second pressure detection device for detecting the pressure of the reduced water supplied to the steam injector; a third pressure detection device for detecting the pressure of the reduced water discharged from the steam injector; a fourth pressure sensing device for sensing;
a power detection device that detects power generated by the turbine;
Among the steam separated by the steam separator, the distribution ratio of the steam supplied to the evaporator or other steam utilization side and the steam amount flowing into the steam injector, the production increase ratio of the production well, and the binary power output increase ratio relationship, analytical value of silica concentration contained in geothermal fluid, ratio of steam to hot water in geothermal fluid, design specification of binary generator and steam injector;
The flow rate of the geothermal fluid for inputting the detection signal of each detection device and obtaining the required power generation output based on the information stored in the database, and for preventing silica from being precipitated by the reduced water, or silica A control device for calculating the flow rate of steam supplied to the steam injector required to suppress the deposition of 2. The binary geothermal power generation system according to claim 1, characterized in that: a first flow control valve that adjusts the flow rate of geothermal fluid extracted from a production well; a second flow control valve that adjusts the flow rate of steam supplied to the steam injector;
A first flow rate detection device for detecting a flow rate of steam supplied to the evaporator side or another steam utilization side, a second flow rate detection device for detecting a flow rate of steam supplied to the steam injector, and a supply to the steam injector. a third flow rate detection device for detecting the flow rate of the reducing water to
a second temperature detection device for detecting the temperature of the reduced water supplied to the steam injector; a third temperature detection device for detecting the temperature of the reduced water discharged from the steam injector;
A first pressure detection device for detecting the pressure of steam supplied to the steam injector, a second pressure detection device for detecting the pressure of the reduced water supplied to the steam injector, and the pressure of the reduced water discharged from the steam injector. a third pressure sensing device that senses the pressure of the throat portion of the steam injector; a fourth pressure sensing device that senses
a power detection device that detects power generated by the turbine;
Among the steam separated by the steam separator, the distribution ratio of the steam supplied to the evaporator or other steam utilization side and the steam amount flowing into the steam injector, the production increase ratio of the production well, and the binary power output increase ratio relationship, analytical value of silica concentration contained in geothermal fluid, ratio of steam to hot water in geothermal fluid, design specification of binary generator and steam injector;
The flow rate of the geothermal fluid for inputting the detection signal of each detection device and obtaining the required power generation output based on the information stored in the database, and for preventing silica from being precipitated by the reduced water, or silica A control device for calculating the flow rate of steam supplied to the steam injector required to suppress the deposition of 2. The binary geothermal power generation system according to claim 1, characterized in that: Steam, which is a geothermal fluid collected from a production well, is heat-exchanged with a low boiling point medium by an evaporator, and the steam of the low boiling point medium thus generated is used to drive a binary turbine to generate power, and the evaporator A binary geothermal power generation system that returns condensed water in which steam is condensed by
A steam injector is provided in the reduced water line for returning the reduced water to the reduction well, and part of the steam, which is the geothermal fluid, and the reduced water are introduced into the steam injector to increase the temperature and pressure of the reduced water. A binary geothermal power generation system characterized by returning to a reinjection well.

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