JP2015090147A - Geothermal power generation system and geothermal power generation system scale prevention method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geothermal power generation system scale prevention method for preventing precipitation of scale in the steam system by supplying oxidant to provide an acidic property.SOLUTION: A geothermal power generation system includes: a steam separator 53 to which geothermal hot water 52 ejected from a production well 51 and containing steam 54 is supplied by a hot-water ejection line L, and which separates the steam 54 from the hot water 52; a turbine 55 rotating by the steam 54 separated by the steam separator 53; a generator 67 connected to the turbine 55 and generating electric power by rotation of the turbine 55; a hot-water return line Lreturning separated hot water 52a separated by the steam separator 53 to a hot-water return well 51B; and an oxidant supply unit 12 supplying oxidant 11 into the separated hot water 52a in the hot-water return line L.

Description

  The present invention relates to a geothermal power generation system and a scale prevention method for a geothermal power generation system.

  Geothermal power generation uses geothermal steam ejected from production wells using high heat stored in the earth, and introduces it into a steam turbine for power generation. It is regarded as an important energy source after nuclear power.

In a geothermal power plant, geothermal hot water mined from the underground contains a large amount of inorganic substances such as silicate, aluminosilicate, calcium carbonate and the like. In particular, when geothermal hot water is jetted up to the ground, the acid gas components H ₂ S and CO _{2 in} the geothermal hot water are released, resulting in a pH of about 7-9 and silica scale in the geothermal hot water. (SiO ₂ ) is likely to be generated. For this reason, after separating the steam from the hot water, in the hot water piping that returns the hot water to the hot water reduction well, the silica component adheres and grows as a scale on the inner peripheral surface of the hot water piping, or the valve malfunctions. May cause problems.
Defects in hot water piping will result in operational shutdowns and new wells need to be mined, increasing costs.

  Moreover, in a heat exchanger using hot water, there is a problem that if the scale is generated on the inner surface of the heat exchange tube with the heat exchange medium, the heat exchange efficiency is greatly reduced.

  For this reason, the structure which peels the scale adhering to an internal peripheral surface by extending and contracting a tube is conventionally proposed, for example using the pipe of the double pipe structure which provided the flexible tube coaxially in the steel pipe. . In addition, it has been proposed to introduce a drug (for example, calcium fluoride) into hot water to elute hydrogen fluoride and dissolve silica as silicon fluoride (Patent Document 1).

JP-A-11-28458

  However, the installation of special piping having a double-pipe structure is very expensive, complicated piping work, and there is a problem that workability cannot be improved and facility costs cannot be reduced. In addition, the generation by elution of fluoride water has a big problem that excessive hydrogen fluoride causes intense corrosion of the piping itself.

  This invention makes it a subject to provide the scale prevention method of the geothermal power generation system which can prevent generation | occurrence | production of scales, such as a geothermal hot water system, and the scale of a geothermal power generation system in view of the said problem.

  A first invention of the present invention for solving the above-described problem is a brackish water separator that is supplied with geothermal hot water containing steam ejected from a production well by a hot water ejection line and separates steam from the hot water, A turbine that is rotated by steam separated by the brackish water separator, a generator that is connected to the turbine and generates electric power by rotation of the turbine, and the separated hot water separated by the brackish water separator is returned to the hot water reduction well. A geothermal power generation system comprising: a hot water return line; and an oxidant supply unit that supplies an oxidant into the separated hot water of the hot water return line.

According to the present invention, the separated hot water in which hydrogen sulfide (H ₂ S) and carbon dioxide (CO ₂ ) in the geothermal hot water ejected from the ground to the ground is degassed and its pH is changed from neutral to weakly alkaline. By supplying an oxidant therein, sulfuric acid is generated in the geothermal hot water from hydrogen sulfide (H ₂ S) in the separated hot water. Thereby, separation hot water is made into the acidic side, the precipitation of the silica component in a hot water system | strain is prevented, and scale adhesion is prevented.

  According to a second invention, in the first invention, a condenser for condensing the steam discharged from the steam turbine, an uncondensed gas that is not condensed by the condenser, are extracted, and the extracted uncondensed gas is extracted. And a non-condensed gas introduction line that introduces into the oxidant supplied from the oxidant supply unit.

According to the present invention, non-condensed gas (for example, carbon dioxide (CO ₂ )) generated when steam is condensed in a condenser is introduced into an oxidant, so that the separated hot water is separated by the bubbling effect of carbon dioxide. Vibration is applied to the scale to prevent scale adhesion. In addition, returning the uncondensed gas that has been discharged to the outside to the underground hot water reduction well together with the separated hot water will eliminate atmospheric emissions and contribute to environmental measures.

  According to a third aspect of the present invention, there is provided an evaporator for supplying geothermal hot water containing steam ejected from a production well through a hot water jet line, exchanging heat between the supplied geothermal hot water and a working medium, and heat exchanged operation. A turbine that rotates by a medium, a generator that is connected to the turbine and generates power by the rotation of the turbine, and a working medium that causes the working medium discharged from the turbine to flow into the turbine again via the evaporator A circulation line, a condenser for condensing the working medium discharged from the turbine, a hot water return line for returning geothermal hot water heat-exchanged by the evaporator to a hot water reduction well, and evaporation of the hot water ejection line An oxidant supply unit that supplies an oxidant into the geothermal hot water on the upstream side of the vessel.

According to the present invention, geothermal hot water in which hydrogen sulfide (H ₂ S) and carbon dioxide (CO ₂ ) in geothermal hot water spouted from the ground to the ground are degassed and its pH is changed from neutral to weakly alkaline. By supplying an oxidant therein, sulfuric acid is generated in the geothermal hot water from the geothermal hot water and hydrogen sulfide (H ₂ S) in the steam. This prevents the scale component of the silica component from adhering to the hydrothermal system with the geothermal hot water as the acidic side.

  4th invention supplies the geothermal hot water containing the steam which spouted from the production well by the hot water ejection line, the brackish water separator which isolate | separates a steam from this geothermal hot water, and the separated said steam from a steam supply line An evaporator that exchanges heat between the supplied steam and the working medium, a turbine that rotates a turbine by the heat-exchanged working medium and drives a generator, and the working medium that is discharged from the turbine. , A working medium circulation line that again flows into the turbine via the evaporator, a condenser that condenses the working medium discharged from the turbine, and steam that has exchanged heat with the evaporator to a hot water reduction well A geothermal power generation system comprising: a return steam return line; and an oxidant supply unit that supplies an oxidant into the steam of the steam supply line.

According to the present invention, geothermal hot water in which hydrogen sulfide (H ₂ S) and carbon dioxide (CO ₂ ) in geothermal hot water spouted from the ground to the ground are degassed and its pH is changed from neutral to weakly alkaline. By supplying an oxidant into the vapor separated from the hydrogen, sulfuric acid is generated from hydrogen sulfide (H ₂ S) in the vapor. This prevents the scale from adhering to the silica component in the steam system including the evaporator with steam as the acidic side.

  According to a fifth aspect of the present invention, there is provided a geothermal power generation system according to the fourth aspect of the invention, further comprising an oxidant supply unit that supplies an oxidant to the separated hot water separated by the brackish water separator.

According to the present invention, sulfuric acid is generated from the separated hot water and hydrogen sulfide (H ₂ S) in the steam by supplying the oxidizing agent into the separated hot water. Thereby, separation hot water is made into the acidic side, and the scale adhesion of the silica component in a hot water system | strain is prevented.

  A sixth invention is the geothermal power generation system according to any one of the first to fifth inventions, wherein the oxidizing agent is one or both of hydrogen peroxide solution and ozone.

  According to the present invention, the oxidizing agent is one or both of hydrogen peroxide water and ozone, so that the oxidation is ensured and scale adhesion of the silica component is prevented.

  A seventh invention is the geothermal power generation system according to the first or third invention, further comprising a pH meter that measures pH in the geothermal hot water after the oxidant is supplied.

  According to the present invention, the supply of the oxidizing agent is appropriately managed by the pH meter, the oxidation reaction is ensured in a predetermined pH range, and the scale adhesion of the silica component is prevented.

  An eighth invention is the geothermal power generation system according to the fourth invention, further comprising a pH meter that measures pH in the steam after the oxidant is supplied.

  According to the present invention, the supply of the oxidizing agent is appropriately managed by the pH meter, the oxidation reaction is ensured in a predetermined pH range, and the scale adhesion of the silica component is prevented.

  A ninth invention is the geothermal power generation system according to the fifth invention, further comprising a pH meter for measuring pH in the separated hot water after the oxidizing agent is supplied.

  According to the present invention, the supply of the oxidizing agent is appropriately managed by the pH meter, the oxidation reaction is ensured in a predetermined pH range, and the scale adhesion of the silica component is prevented.

  10th invention isolate | separates a steam from the geothermal hot water containing the steam which spouted from the production well, rotates a turbine with this separated steam, drives a generator, and produces | generates electricity, and the separation | separation after gas-liquid separation The present invention resides in a scale prevention method for a geothermal power generation system, characterized in that an oxidizing agent is supplied to hot water so as to be on the acidic side to prevent precipitation of scale in a separated hot water system.

According to the present invention, the separated hot water in which hydrogen sulfide (H ₂ S) and carbon dioxide (CO ₂ ) in the geothermal hot water ejected from the ground to the ground is degassed and its pH is changed from neutral to weakly alkaline. By supplying an oxidant therein, sulfuric acid is generated in the geothermal hot water from hydrogen sulfide (H ₂ S) in the separated hot water. Thereby, separation hot water is made into the acidic side, and the scale adhesion of the silica component in a hot water system | strain is prevented.

  In an eleventh aspect based on the tenth aspect, when the steam discharged from the steam turbine is condensed by a condenser, the non-condensed gas that is not condensed by the condenser is extracted and the extracted non-condensed gas is extracted. In a method for preventing scale of a geothermal power generation system, which is characterized in that is introduced into an oxidizing agent.

According to the present invention, non-condensed gas (for example, carbon dioxide (CO ₂ )) generated when steam is condensed in a condenser is introduced into an oxidant, so that the separated hot water is separated by the bubbling effect of carbon dioxide. Vibration is applied to the scale to prevent scale adhesion. In addition, returning the uncondensed gas that has been discharged to the outside to the underground hot water reduction well together with the separated hot water will eliminate atmospheric emissions and contribute to environmental measures.

  In the twelfth aspect of the invention, when heat is exchanged with the working medium using the geothermal hot water containing the steam ejected from the production well and the evaporator, the turbine is rotated by the heat exchanged working medium, and the generator is driven to generate power. The present invention provides a scale prevention method for a geothermal power generation system, characterized in that an oxidizing agent is supplied into the geothermal hot water to make it acidic and prevent precipitation of scale in the geothermal hot water system.

According to the present invention, geothermal hot water in which hydrogen sulfide (H ₂ S) and carbon dioxide (CO ₂ ) in geothermal hot water spouted from the ground to the ground are degassed and its pH is changed from neutral to weakly alkaline. By supplying an oxidant therein, sulfuric acid is generated in the geothermal hot water from the geothermal hot water and hydrogen sulfide (H ₂ S) in the steam. This prevents the scale component of the silica component from adhering to the hydrothermal system with the geothermal hot water as the acidic side.

  In a thirteenth aspect, steam is separated from geothermal hot water containing steam ejected from the production well, the separated steam and the evaporator are used for heat exchange with the working medium, and the turbine is rotated by the heat exchanged working medium. In the method for preventing scale of a geothermal power generation system, when generating electricity by driving a generator, an oxidizing agent is supplied into the steam so as to be on the acidic side, and precipitation of scale in the steam system is prevented. .

According to the present invention, geothermal hot water in which hydrogen sulfide (H ₂ S) and carbon dioxide (CO ₂ ) in geothermal hot water spouted from the ground to the ground are degassed and its pH is changed from neutral to weakly alkaline. By supplying an oxidant into the vapor separated from the hydrogen, sulfuric acid is generated from hydrogen sulfide (H ₂ S) in the vapor. This prevents the scale from adhering to the silica component in the steam system including the evaporator with steam as the acidic side.

  A fourteenth aspect of the invention is characterized in that, in the thirteenth aspect of the invention, an oxidizing agent is supplied into the separated hot water separated from the geothermal hot water to make it acidic, thereby preventing the scale from depositing in the separated hot water system. It is in the scale prevention method of the geothermal power generation system.

According to the present invention, sulfuric acid is generated from the separated hot water and hydrogen sulfide (H ₂ S) in the steam by supplying the oxidizing agent into the separated hot water. Thereby, separation hot water is made into the acidic side, and the scale adhesion of the silica component in a hot water system | strain is prevented.

  A fifteenth aspect of the present invention is the scale preventing method for a geothermal power generation system according to any one of the tenth to fourteenth aspects, wherein the oxidizing agent is one or both of hydrogen peroxide water and ozone. is there.

  According to the present invention, the oxidizing agent is one or both of hydrogen peroxide water and ozone, so that the oxidation is ensured and scale adhesion of the silica component is prevented.

According to the present invention, the separated hot water in which hydrogen sulfide (H ₂ S) and carbon dioxide (CO ₂ ) in the geothermal hot water ejected from the ground to the ground is degassed and its pH is changed from neutral to weakly alkaline. By supplying an oxidant therein, sulfuric acid is generated in the geothermal hot water from hydrogen sulfide (H ₂ S) in the separated hot water. Thereby, separation hot water is made into the acidic side, and the scale adhesion of the silica component in a hot water system | strain is prevented. Thereby, the life extension of facilities, such as hot water piping, can be aimed at.

FIG. 1 is a schematic diagram of a geothermal power generation system according to the first embodiment. FIG. 2 is a schematic diagram of a geothermal power generation system according to the second embodiment. FIG. 3 is a schematic diagram of a geothermal power generation system according to the third embodiment. FIG. 4 is a schematic diagram of a geothermal power generation system according to the fourth embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

FIG. 1 is a schematic diagram of a geothermal power generation system according to the first embodiment.
As shown in FIG. 1, a geothermal power generation system 50A according to the present embodiment is a single flash type geothermal power generation system, and geothermal hot water 52 including steam 54 ejected from a production well 51A is fed by a hot water ejection line L _1. A steam separator 53 that is supplied and separates the steam 54 from the geothermal hot water 52, a steam turbine 55 that is rotated by the steam 54 separated by the steam separator 53, and is connected to the turbine 55, A generator 67 that generates electric power by rotation, a hot water return line L ₂ that returns the separated hot water 52a separated by the brackish water separator 53 to the hot water reduction well 51B, and the separated hot water of the hot water return line L ₂ A hydrogen peroxide solution supply unit 12 that supplies hydrogen peroxide solution 11 that is an oxidizing agent is provided in 52a. Further, in this embodiment, a condenser 56 that condenses the steam emitted from the steam turbine 55 to condensate 57, a cooling tower 59 that cools the condensed condensate 57 to cool water 60, And a gas air extractor 63 for extracting the non-condensed gas 62 which is not condensed from the condenser 56. Reference numeral 58 is a condensate pump, 61 is a cooling water pump, 65 is a hot water tank, 67 is a generator, 68 is a silencer, V ₁₁ is a valve, L ₃ is a steam line, L ₄ is an uncondensed gas extraction line, L ₅ illustrates the cooling water line.

  The production well 51A is a well that collects natural high-pressure geothermal hot water (geothermal steam) from, for example, an underground stay layer (not shown) of high-pressure hot water generated below 500m to 4,000m underground. Since the pressure of the high-pressure geothermal hot water 52 suddenly drops during the rise to the ground to be collected, a part of it is vaporized into steam, and hot water (liquid) and steam (gas) are mixed on the ground. It is a two-phase flow. Then, for example, a swirl-type brackish water separator 53 is connected to the rear stage (downstream side) of the production well 51 </ b> A by piping, and the two-phase flow collected from the production well 51 </ b> A is separated by the brackish water separator 53. After being separated into the liquid) 52a and the vapor (gas) 54, the separated hot water 52a is returned to the hot water reduction well 51B via the hot water tank 65, and sent back to the underground staying layer. Reused as water.

  On the other hand, the steam 54 separated from the geothermal hot water 52 by the brackish water separator 53 is sent to a mist separator (not shown). In the mist separator, the mist (liquid) in the vapor that could not be sufficiently separated in the brackish water separator 53 is removed.

  Thereafter, the steam 54 is sent to the steam turbine 55, and high-pressure steam blown from a turbine nozzle (not shown) inside the steam turbine 55 rotates a turbine blade (not shown) connected to the generator 67. Thus, electric power is generated.

  As described above, the geothermal power plant is a plant that generates power by rotating the steam turbine 55 using steam vaporized from high-pressure hot water collected from the underground as a working fluid. The high-pressure hot water collected from the groundwater is generated by the contact and permeation of groundwater to the high-temperature hot rocks in the ground, so various “chemical components” contained in the high-temperature rocks are dissolved in large amounts in the high-pressure hot water. doing.

Since the geothermal hot water 52 contains a large amount of inorganic substances such as silicate, aluminosilicate, calcium carbonate, etc., when hot water is jetted upward, the acidic gas component in the geothermal hot water 52 As a result of the release of H ₂ S and CO ₂ , the pH becomes about 7 to 9, and silica scale is easily generated in the geothermal hot water 52. For this reason, after separating the steam 54 from the geothermal hot water 52, in the hot water piping for returning the separated hot water 52a to the hot water reducing well 51B, the silica component grows as a scale on the inner peripheral surface of the hot water piping. Therefore, the following measures are taken to prevent scale adhesion and prevent problems such as valve malfunction.

  In this embodiment, a hydrogen peroxide solution supply unit 12 that is an oxidant supply unit that supplies the hydrogen peroxide solution 11 as an oxidant to the separated hot water 52a is provided on the downstream side of the brackish water separator 53.

By supplying the hydrogen peroxide solution 11 to the separated hot water 52a, sulfuric acid is generated in the separated hot water 52a from hydrogen sulfide (H ₂ S) in the separated hot water 52a. This makes it possible to prevent the silica component from adhering to the scale in the hot water system by using the separated hot water 52a as the acidic side.

Here, as the oxidizing agent, the hydrogen peroxide solution 11 is exemplified in the present embodiment, but ozone (O ₃ ) may be used.

Thus, according to the present embodiment, for example, by supplying the oxidizing agent of the hydrogen peroxide solution 11 to the separation hot water 52a, sulfuric acid is generated from the hydrogen sulfide contained in the separation hot water 52a, and the pH is adjusted to the acidic side. By setting (for example, pH 3 to 5), generation of hard silica scale will be prevented. Thereby, precipitation of silica scale is prevented in the supply pipe or valve of the separated hot water 52a, and stable operation can be performed for a long period of time. Thereby, the life extension of facilities, such as hot water piping, can be aimed at. Incidentally, the pH is in the acidic side (e.g., pH 3-5) is so as to check the pH meter 13 provided in the line L ₂ back hot water.
The pH meter 13 can appropriately manage the supply of the hydrogen peroxide solution 11 that is an oxidizing agent to ensure the oxidation reaction in a predetermined pH range and prevent the silica component from adhering to the scale.

  Next, a geothermal power generation system according to Embodiment 2 of the present invention will be described. Below, it demonstrates centering around difference with the geothermal power generation system which concerns on Example 1. FIG. In addition, about the component same as the geothermal power generation system which concerns on Example 1, the same code | symbol is attached | subjected and duplication of description is avoided.

FIG. 2 is a schematic diagram of a geothermal power generation system according to the second embodiment.
As shown in FIG. 2, geothermal power generation system 50B according to the present embodiment is branched from noncondensable gas extraction line L ₄ of, noncondensable gas introduction line for supplying a noncondensable gas 62 to the hydrogen peroxide introduction line L ₁₁ L ₁₂ is provided.
In the first embodiment, the non-condensable gas 62 is diffused from the cooling tower 59 to the outside. In this embodiment, the non-condensable gas 62 is supplied to the hydrogen peroxide introduction line L ₁₁ by supplying the non-condensable gas 62 to the hydrogen peroxide introduction line L ₁₁ . Carbon dioxide (CO ₂ ), which is a component of the above, gives vibration to the separated hot water due to its bubbling effect and suppresses scale adhesion.

  Further, by returning the uncondensed gas 62 that has been discharged to the outside together with the separated hot water 52a to the underground hot water reducing well 51B, the release to the atmosphere is eliminated, contributing to environmental measures.

Next, a geothermal power generation system according to Embodiment 3 of the present invention will be described.
FIG. 3 is a schematic diagram of a geothermal power generation system according to the third embodiment.
As shown in FIG. 3, the geothermal power generation system 50C according to the present embodiment is a binary type geothermal power generation system.
The binary power generation facility of Example 3 generates power by rotating a turbine with a low boiling point working medium having a lower boiling point than water, and is applied as, for example, a geothermal power generation facility.

  The binary power generation facility exchanges heat between the geothermal hot water 52 from the production well 51A and the working medium 71 with the evaporator 72, evaporates the working medium 71, and supplies the evaporated working medium 71 to the turbine 74 to generate power. Is going. The working medium 71 discharged from the turbine 74 is condensed by the condenser 75, and the condensed working medium 71 is again heat-exchanged with the geothermal hot water 52 by the evaporator 72. Here, as the working medium 71, for example, a low boiling point working medium such as butane or pentane is used.

As shown in FIG. 3, the binary geothermal power generation system 50 </ b> C includes a turbine 74, a circulation line L ₂₁ , an evaporator 72, a condenser 75, a feed pump 73, and a generator 76. The binary geothermal power generation system 50C includes a hot water ejection line L ₁ connected to the evaporator 72, a cooling line L ₂₂ connected to the condenser 75, and a cooling tower 59 provided in the cooling line L _22. , and a cooling water pump 61 provided in the cooling line L _22.

  The turbine 74 is rotated by the working fluid 71 flowing in from the inlet side, and discharges the working fluid 71 from the outlet side. The turbine 74 is a so-called ORC (Organic Rankine Cycle) turbine, and is a turbine for low-temperature heat source power generation. In the turbine 74, the pressure of the working medium on the inlet side is higher than the pressure of the working medium on the outlet side, and the turbine performance improves as the pressure difference between the inlet side and the outlet side increases.

In this embodiment, on the upstream side of the evaporator 72 in the hot water ejection line L ₁ , the hydrogen peroxide solution 11 as the oxidant is supplied to the geothermal hot water 52 through the hydrogen peroxide introduction line L _11. It is supplied from the water supply unit 12.

By supplying the hydrogen peroxide solution 11 to the geothermal hot water 52, sulfuric acid is generated in the geothermal hot water 52 from hydrogen sulfide (H ₂ S) in the geothermal hot water 52. As a result, it is possible to prevent the silica component from adhering to the scale in the hot water system by using the geothermal hot water 52 as the acidic side.

  Next, a geothermal power generation system according to Embodiment 4 of the present invention will be described. FIG. 4 is a schematic diagram of a geothermal power generation system according to the fourth embodiment. Below, it demonstrates centering around difference with the geothermal power generation system which concerns on Example 1 and 3. FIG. In addition, about the same component as the geothermal power generation system which concerns on Example 1 and 3, the same code | symbol is attached | subjected and duplication of description is avoided.

  In the geothermal power generation system 50D according to the present embodiment, a brackish water separator 53 that separates the steam 54 from the geothermal hot water 52 is provided, and the separated steam 54 and the working medium 71 are heat-exchanged by the evaporator 72 and evaporated. 71 is supplied to the turbine 74 to generate power. In particular, some of the geothermal hot water 52 has a high salinity concentration (for example, a salinity concentration of 6% or more). In such a case, the working medium 71 uses only the steam 54 separated by the brackish water separator 53. It is desirable to exchange heat with.

In this embodiment, on the upstream side of the evaporator 72 in the vapor line L ₃ , the hydrogen peroxide solution 11 as an oxidant is introduced into the vapor 54 via the hydrogen peroxide introduction line L _11. 12 is supplied. The adjustment of the supply of the hydrogen peroxide solution 11 is confirmed by the pH meter 13.

By supplying the hydrogen peroxide solution 11 to the steam 54, sulfuric acid is generated in the steam 54 from mist-like hydrogen sulfide (H ₂ S) contained in the steam 54. As a result, the vapor 54 can be set to the acidic side to prevent the silica component from adhering to the scale in the evaporator 72 and the evaporation system.
Further, as in Example 1, the hydrogen peroxide solution 11 is also supplied to the separated hot water 52a separated by the brackish water separator 53, and as an acidic side, the scale adhesion of the silica component in the hot water system of the separated hot water 52a It is possible to prevent.

DESCRIPTION OF SYMBOLS 11 Hydrogen peroxide solution 12 Hydrogen peroxide solution supply part 50A-50D Geothermal power generation system 51A Production well 51B Hydrothermal reduction well 52 Hot water 53 Brackish water separator 54 Steam 55 Steam turbine 71 Working medium 72 Evaporator 74 Turbine 75 Condenser

Claims (15)

A brackish water separator for supplying geothermal hot water containing steam ejected from the production well through a hot water jet line and separating the steam from the geothermal hot water;
A turbine rotating by steam separated by the brackish water separator;
A generator connected to the turbine and generating electricity by rotation of the turbine;
A hot water return line for returning the separated hot water separated by the brackish water separator to the hot water reduction well;
An oxidant supply unit that supplies an oxidant into the separated hot water of the hot water return line. In claim 1,
A condenser for condensing the steam discharged from the turbine;
A geothermal power generation comprising: an uncondensed gas introduction line for extracting uncondensed gas that is not condensed by the condenser and introducing the extracted uncondensed gas into an oxidant supplied from the oxidant supply unit. system. An evaporator for supplying geothermal hot water containing steam ejected from the production well through a hot water ejection line, and exchanging heat between the supplied geothermal hot water and the working medium;
A turbine rotating with a heat exchanged working medium;
A generator connected to the turbine and generating electricity by rotation of the turbine;
A working medium circulation line for allowing the working medium discharged from the turbine to flow into the turbine again via the evaporator;
A condenser for condensing the working medium discharged from the turbine;
A hot water return line that returns the geothermal hot water heat-exchanged in the evaporator to the hot water reduction well;
A geothermal power generation system comprising: an oxidant supply unit that supplies an oxidant into the geothermal hot water on a upstream side of an evaporator of the hot water ejection line. A brackish water separator for supplying geothermal hot water containing steam ejected from the production well through a hot water jet line and separating the steam from the geothermal hot water;
An evaporator for supplying the separated steam from a steam supply line and exchanging heat between the supplied steam and a working medium;
A turbine that rotates a turbine with a heat exchanged working medium and drives a generator;
A working medium circulation line for allowing the working medium discharged from the turbine to flow into the turbine again via the evaporator;
A condenser for condensing the working medium discharged from the turbine;
A steam return line for returning the steam exchanged in the evaporator to the hot water reduction well;
An oxidant supply unit that supplies an oxidant into the steam of the steam supply line, and a geothermal power generation system. In claim 4,
An oxidant supply unit that supplies an oxidant into the separated hot water separated by the brackish water separator, and a geothermal power generation system. In any one of Claims 1 thru | or 5,
The geothermal power generation system, wherein the oxidizing agent is one or both of hydrogen peroxide water and ozone. In claim 1 or 3,
A geothermal power generation system comprising a pH meter that measures pH in the geothermal hot water after the oxidant is supplied. In claim 4,
A geothermal power generation system comprising a pH meter that measures pH in the steam after the oxidant is supplied. In claim 5,
A geothermal power generation system comprising a pH meter that measures pH in the separated hot water after the oxidant is supplied. When separating steam from geothermal hot water containing steam ejected from the production well, rotating the turbine with the separated steam and driving the generator to generate electricity,
Supply oxidant to the separated hot water after gas-liquid separation to make it acidic side,
A scale prevention method for a geothermal power generation system, characterized in that scale precipitation in a separated hot water system is prevented. In claim 10,
When condensing the steam discharged from the steam turbine in a condenser,
A scale prevention method for a geothermal power generation system, wherein uncondensed gas that is not condensed by the condenser is extracted, and the extracted uncondensed gas is introduced into an oxidant. When exchanging heat with the working medium using the geothermal hot water containing the steam ejected from the production well and the evaporator, rotating the turbine with the heat-exchanged working medium, and driving the generator to generate electricity,
Supply oxidant into the geothermal hot water to make it acidic,
A scale prevention method for a geothermal power generation system, characterized in that scale precipitation in a geothermal hot water system is prevented. Steam is separated from the geothermal hot water containing the steam ejected from the production well, and the separated steam and the evaporator exchange heat with the working medium. The turbine is rotated by the heat exchanged working medium and the generator is driven. When generating electricity
Supply an oxidizing agent into the steam to make it acidic,
A scale prevention method for a geothermal power generation system, characterized in that scale deposition in a steam system is prevented. In claim 13,
Supply an oxidant into the separated hot water separated from the geothermal hot water to make it acidic,
A scale prevention method for a geothermal power generation system, characterized in that scale precipitation in a separated hot water system is prevented. In any one of Claims 10 thru | or 14,
A scale prevention method for a geothermal power generation system, wherein the oxidizing agent is one or both of hydrogen peroxide water and ozone.

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