JP2014234794A - Geothermal power generation method and geothermal power generation system - Google Patents

Geothermal power generation method and geothermal power generation system Download PDF

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JP2014234794A
JP2014234794A JP2013118013A JP2013118013A JP2014234794A JP 2014234794 A JP2014234794 A JP 2014234794A JP 2013118013 A JP2013118013 A JP 2013118013A JP 2013118013 A JP2013118013 A JP 2013118013A JP 2014234794 A JP2014234794 A JP 2014234794A
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geothermal power
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JP6153774B2 (en
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山本　肇
Hajime Yamamoto
肇 山本
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Taisei Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

PROBLEM TO BE SOLVED: To provide a geothermal power generation method capable of reliably recovering a heat medium pressed into a reservoir in a high temperature rock body and improving power generation efficiency.SOLUTION: A geothermal power generation method allows a power generator 50 to generate electricity with a heat medium pressed into and recovered from a reservoir B1 formed in a high temperature rock body B through a single well 10. The geothermal power generation method comprises the steps to: press the heat medium made of supercritical fluid into the reservoir B1 through the well 10; heat the heat medium in the reservoir B1 with ground heat by shielding an interior of the well 10; recover the heat medium from the reservoir B1 through the well 10 by opening the interior thereof; and generate electricity with a turbine 51 of the power generator 50 driven by the heat medium recovered through the well 10.

Description

本発明は、地熱発電方法および地熱発電システムに関する。   The present invention relates to a geothermal power generation method and a geothermal power generation system.

地熱を利用した発電方法としては、地盤内に貯留された熱水を利用する方法の他に、地盤内の高温岩体に形成された貯留層に注入井を通じて水を供給する段階と、地熱により貯留層内で水を加熱する段階と、貯留層内から生産井を通じて熱水を回収する段階と、熱水によって発電装置のタービンを駆動させる段階と、を備えているものがある。   In addition to the method of using hot water stored in the ground, the power generation method using geothermal includes the stage of supplying water through the injection well to the reservoir formed in the hot rock body in the ground, There is one that includes a step of heating water in the reservoir, a step of recovering hot water from the reservoir through a production well, and a step of driving the turbine of the power generation device by the hot water.

前記したいずれの発電方法でも熱水の一部が蒸発により損失するとともに、地盤内の熱水の採取により、周辺の温泉等の地熱資源の熱水量や温度に影響を与える可能性がある。   In any of the above-described power generation methods, a part of hot water is lost due to evaporation, and collection of hot water in the ground may affect the amount and temperature of hot water of a geothermal resource such as a nearby hot spring.

そこで、従来の地熱発電方法としては、図４に示すように、高温岩体Ｂの貯留層１００に注入井１１０から二酸化炭素や液体の超臨界流体からなる熱媒体を圧入し、その熱媒体を生産井１２０から回収して、発電装置５０のタービン５１を駆動させているものがある（例えば、特許文献１参照）。   Therefore, as a conventional geothermal power generation method, as shown in FIG. 4, a heat medium made of carbon dioxide or a liquid supercritical fluid is injected from the injection well 110 into the reservoir 100 of the high temperature rock body B, and the heat medium is used. Some are recovered from the production well 120 and drive the turbine 51 of the power generation device 50 (see, for example, Patent Document 1).

二酸化炭素を用いた地熱発電方法では、熱媒体の損失を抑えるとともに、周辺の地熱資源への影響を防ぐことができる。また、二酸化炭素は高温高圧下（温度３１度以上、圧力７．３ＭＰａ以上）の超臨界状態では水と混合し難いため、鉱物スケールの生成を抑えることができる。   In the geothermal power generation method using carbon dioxide, the loss of the heat medium can be suppressed and the influence on the surrounding geothermal resources can be prevented. Further, since carbon dioxide is difficult to mix with water in a supercritical state under high temperature and high pressure (temperature of 31 ° C. or higher and pressure of 7.3 MPa or higher), generation of mineral scale can be suppressed.

特開昭５６−１４８６９０号公報JP 56-148690 A

従来の二酸化炭素を用いた地熱発電方法では、図４に示すように、注入井１１０および生産井１２０の二つの井戸を用いており、注入井１１０から貯留層１００に圧入した熱媒体を、別の場所に設置された生産井１２０から回収している。この構成では、注入井１１０と生産井１２０との間の地盤の連続性（流体の浸透性）が低い場合に、熱媒体の回収量が少なくなるという問題がある。   In the conventional geothermal power generation method using carbon dioxide, as shown in FIG. 4, two wells of the injection well 110 and the production well 120 are used, and the heat medium press-fitted into the reservoir 100 from the injection well 110 is separated. It is collected from the production well 120 installed at the location. In this configuration, when the ground continuity (fluid permeability) between the injection well 110 and the production well 120 is low, there is a problem that the recovery amount of the heat medium is reduced.

本発明は、前記した問題を解決し、高温岩体の貯留層に圧入した超臨界流体からなる熱媒体を確実に回収することができ、発電効率を高めることができる地熱発電方法および地熱発電システムを提供することを課題とする。   The present invention solves the above-described problems, can reliably recover a heat medium composed of a supercritical fluid press-fitted into a reservoir of a high-temperature rock body, and can improve a power generation efficiency and a geothermal power generation system It is an issue to provide.

前記課題を解決するため、本発明は、地盤内の高温岩体に形成された貯留層に単一の井戸を通じて熱媒体を圧入および回収することで発電装置を発電させる地熱発電方法であって、前記貯留層に前記井戸を通じて超臨界流体からなる前記熱媒体を圧入する段階と、前記井戸の内部を遮断し、地熱により前記貯留層内で前記熱媒体を加熱する段階と、前記井戸の内部を開放し、前記貯留層内から前記井戸を通じて前記熱媒体を回収する段階と、前記井戸から回収した前記熱媒体によって前記発電装置のタービンを駆動して発電する段階と、を備えている。   In order to solve the above-mentioned problem, the present invention is a geothermal power generation method for generating a power generation device by injecting and recovering a heat medium through a single well into a reservoir formed in a hot rock body in the ground, Pressurizing the heat medium made of a supercritical fluid into the reservoir through the well, blocking the inside of the well, heating the heat medium in the reservoir by geothermal heat, and the inside of the well And releasing the heat medium from the reservoir through the well and driving the turbine of the power generation device with the heat medium recovered from the well to generate electric power.

また、本発明は、地熱発電システムであって、地盤内の高温岩体に形成された貯留層に通じる井戸と、前記井戸の内部を遮断および開放する開閉手段と、前記井戸に超臨界流体からなる熱媒体を供給する供給装置と、タービンの駆動により発電する発電装置と、を備え、前記井戸から回収した前記熱媒体によって前記タービンを駆動するように構成されている。   The present invention is also a geothermal power generation system, wherein a well leading to a reservoir formed in a hot rock body in the ground, an opening / closing means for blocking and opening the inside of the well, and a supercritical fluid in the well And a power generation device that generates electric power by driving the turbine, and is configured to drive the turbine by the heat medium recovered from the well.

本発明の地熱発電方法および地熱発電システムでは、超臨界流体からなる熱媒体を井戸から貯留層に圧入し、その熱媒体を同じ井戸を通じて貯留層から回収している。このように、単一の井戸を用いて貯留層の同じ場所で熱媒体を圧入および回収しているため、地盤の連続性が低い場合でも、貯留層に圧入した熱媒体を確実に回収することができる。   In the geothermal power generation method and geothermal power generation system of the present invention, a heat medium made of a supercritical fluid is pressed into a reservoir from a well, and the heat medium is recovered from the reservoir through the same well. Thus, since the heat medium is injected and recovered at the same location in the reservoir using a single well, the heat medium injected into the reservoir can be reliably recovered even when the ground continuity is low. Can do.

前記した地熱発電方法において、前記貯留層に複数の前記井戸が設け、前記各井戸のそれぞれを通じて前記貯留層に前記熱媒体を圧入および回収するように構成し、前記各井戸を通じて前記貯留層内から順次に前記熱媒体を回収することで、タービンを連続して駆動することが望ましい。   In the geothermal power generation method described above, a plurality of the wells are provided in the reservoir, and the heat medium is press-fitted and recovered into the reservoir through each of the wells. It is desirable to continuously drive the turbine by sequentially collecting the heat medium.

前記した地熱発電方法および地熱発電方法において、熱媒体が二酸化炭素の超臨界流体である場合には、二酸化炭素の超臨界流体は水と混合し難いため、鉱物スケールの生成を抑えることができる。また、二酸化炭素の超臨界流体は、粘性が小さいとともに、地盤内において浮力および膨張力が大きいため、地盤内から井戸を通じて熱媒体を確実に回収することができる。さらに、貯留層に圧入された二酸化炭素の一部が地中に固定化されることで、大気中の二酸化炭素の削減に寄与することができる。   In the above-described geothermal power generation method and geothermal power generation method, when the heat medium is a supercritical fluid of carbon dioxide, the supercritical fluid of carbon dioxide is difficult to mix with water, and therefore generation of mineral scale can be suppressed. In addition, since the supercritical fluid of carbon dioxide has low viscosity and large buoyancy and expansion force in the ground, the heat medium can be reliably recovered from the ground through the well. Furthermore, a part of the carbon dioxide injected into the reservoir is fixed in the ground, which can contribute to the reduction of carbon dioxide in the atmosphere.

本発明の地熱発電方法および地熱発電システムでは、単一の井戸を用いて貯留層に熱媒体を圧入および回収しているため、貯留層に圧入した熱媒体を確実に回収することができ、発電効率を高めることができる。   In the geothermal power generation method and geothermal power generation system of the present invention, the heat medium is press-fitted and recovered into the reservoir using a single well, so the heat medium press-fitted into the reservoir can be reliably recovered, and power generation Efficiency can be increased.

本実施形態の地熱発電システムおよび地熱発電方法を示した図であり、第一貯留層に熱媒体を圧入し、第三貯留層から熱媒体を回収する段階の構成図である。It is the figure which showed the geothermal power generation system and the geothermal power generation method of this embodiment, and is a block diagram of the step which press-fits a heat medium to a 1st storage layer, and collect | recovers a heat medium from a 3rd storage layer. 本実施形態の地熱発電システムおよび地熱発電方法を示した図であり、第三貯留層に熱媒体を圧入し、第二貯留層から熱媒体を回収する段階の構成図である。It is the figure which showed the geothermal power generation system and geothermal power generation method of this embodiment, and is a block diagram of the step which press-fits a heat medium to a 3rd storage layer, and collect | recovers a heat medium from a 2nd storage layer. 本実施形態の地熱発電システムおよび地熱発電方法を示した図であり、第二貯留層に熱媒体を圧入し、第一貯留層から熱媒体を回収する段階の構成図である。It is the figure which showed the geothermal power generation system and geothermal power generation method of this embodiment, and is a block diagram of the step which press-fits a heat medium to a 2nd storage layer, and collect | recovers a heat medium from a 1st storage layer. 従来の地熱発電方法を示した構成図である。It is the block diagram which showed the conventional geothermal power generation method.

本発明の実施形態について、適宜図面を参照しながら詳細に説明する。
本実施形態の地熱発電システム１は、図１に示すように、地盤Ａ内の高温岩体Ｂに形成された三つの貯留層Ｂ１，Ｂ２，Ｂ３にそれぞれ通じる三つの井戸１０，２０，３０と、井戸１０，２０，３０に設けられた開閉手段１１，２１，３１と、各井戸１０，２０，３０に熱媒体を供給する供給装置４０と、タービン５１を有する発電装置５０と、を備えている。 Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the geothermal power generation system 1 of the present embodiment includes three wells 10, 20, 30 that respectively connect to the three reservoirs B 1, B 2, B 3 formed in the high-temperature rock body B in the ground A. Open / close means 11, 21, 31 provided in the wells 10, 20, 30, a supply device 40 for supplying a heat medium to each of the wells 10, 20, 30, and a power generator 50 having a turbine 51. Yes.

地盤Ａ内の高温岩体Ｂは、地中のマグマによって加熱されている岩盤であり、地熱発電システム１の熱源となる部位である。
高温岩体Ｂには三つの貯留層Ｂ１，Ｂ２，Ｂ３が形成されている。貯留層Ｂ１，Ｂ２，Ｂ３は、岩盤に人工的な割れ目群を形成した領域であり、流体を貯留可能となっている。なお、岩盤に自然に形成された割れ目群をそのまま貯留層として利用することもできる。 A high-temperature rock body B in the ground A is a rock that is heated by underground magma, and serves as a heat source for the geothermal power generation system 1.
Three reservoirs B1, B2, and B3 are formed in the high-temperature rock body B. The reservoirs B1, B2, and B3 are regions in which artificial cracks are formed in the rock, and can store fluid. In addition, the crack group naturally formed in the bedrock can be used as a reservoir as it is.

第一井戸１０は、地面から第一貯留層Ｂ１に亘って削孔された井戸である。第一井戸１０の地面側の開口部は、供給管１２によって供給装置４０に連結されるとともに、送出管１３によって発電装置５０のタービン５１に連結されている。供給管１２および送出管１３には開閉弁１２ａ，１３ａが設けられている。   The first well 10 is a well drilled from the ground over the first reservoir B1. The opening on the ground side of the first well 10 is connected to the supply device 40 by the supply pipe 12 and is connected to the turbine 51 of the power generation device 50 by the delivery pipe 13. The supply pipe 12 and the delivery pipe 13 are provided with on-off valves 12a and 13a.

第二井戸２０は地面から第二貯留層Ｂ２に亘って削孔された井戸であり、第三井戸３０は地面から第三貯留層Ｂ３に亘って削孔された井戸である。
第二井戸２０および第三井戸３０は、第一井戸１０と同様に、供給管２２，３２によって供給装置４０に連結されるとともに、送出管２３，３３によってタービン５１に連結されている。供給管２２，３２には開閉弁２２ａ，３２ａが設けられるとともに、送出管２３，３３には開閉弁２３ａ，３３ａが設けられている。 The second well 20 is a well drilled from the ground to the second reservoir B2, and the third well 30 is a well drilled from the ground to the third reservoir B3.
Similarly to the first well 10, the second well 20 and the third well 30 are connected to the supply device 40 by supply pipes 22 and 32 and are connected to the turbine 51 by delivery pipes 23 and 33. The supply pipes 22 and 32 are provided with on-off valves 22a and 32a, and the delivery pipes 23 and 33 are provided with on-off valves 23a and 33a.

開閉手段１１，２１，３１は、各井戸１０，２０，３０の内部を遮断および開放するものである。開閉手段１１，２１，３１は、プラグ、パッカーおよび開閉弁等の装置である。開閉手段１１，２１，３１を閉じて、各井戸１０，２０，３０の内部を遮断することで、貯留層Ｂ１，Ｂ２，Ｂ３は閉塞された領域となる。   The opening / closing means 11, 21, 31 are for blocking and opening the inside of each well 10, 20, 30. The opening / closing means 11, 21, 31 are devices such as plugs, packers, and opening / closing valves. The reservoirs B1, B2, and B3 are closed regions by closing the opening and closing means 11, 21, and 31 and blocking the insides of the wells 10, 20, and 30.

供給装置４０は、二酸化炭素の超臨界流体からなる熱媒体を各供給管１２，２２，３２に供給するものである。なお、供給装置４０は、還元管４１によってタービン５１に連結されており、タービン５１から還元管４１を通じて熱媒体が供給される。
二酸化炭素の超臨界流体とは、二酸化炭素を高温高圧下（温度３１度以上、圧力７．３ＭＰａ以上）の超臨界状態にしたものである。二酸化炭素は超臨界状態では気体と液体の両方の性質を有する流体となる。なお、二酸化炭素の超臨界流体は水と混合し難い。 The supply device 40 supplies a heat medium made of a supercritical fluid of carbon dioxide to each of the supply pipes 12, 22, and 32. The supply device 40 is connected to a turbine 51 by a reduction pipe 41, and a heat medium is supplied from the turbine 51 through the reduction pipe 41.
The supercritical fluid of carbon dioxide is obtained by bringing carbon dioxide into a supercritical state under high temperature and high pressure (temperature of 31 ° C. or higher, pressure of 7.3 MPa or higher). Carbon dioxide is a fluid having both gas and liquid properties in the supercritical state. Carbon dioxide supercritical fluid is difficult to mix with water.

発電装置５０は、タービン５１の羽根を回転させることで発電するものである。本実施形態の発電装置５０では、各貯留層Ｂ１，Ｂ２，Ｂ３から回収された熱媒体を、タービン５１の羽根に吹き付けることで、羽根が回転するように構成されている。   The power generation device 50 generates power by rotating the blades of the turbine 51. The power generation device 50 according to the present embodiment is configured such that the blades rotate by blowing the heat medium recovered from the respective reservoirs B1, B2, and B3 to the blades of the turbine 51.

次に、前記した地熱発電システム１を用いた地熱発電方法について説明する。
最初に第一井戸１０を用いた発電について説明し、その後、三つの井戸１０，２０，３０を組み合わせた発電について説明する。 Next, a geothermal power generation method using the above-described geothermal power generation system 1 will be described.
First, power generation using the first well 10 will be described, and then power generation combining the three wells 10, 20, and 30 will be described.

まず、図１に示すように、供給管１２の開閉弁１２ａを開くとともに、送出管１３の開閉弁１３ａを閉じる。そして、第一井戸１０の開閉手段１１を開いた状態で、供給装置４０から供給管１２を通じて第一井戸１０に熱媒体を供給し、第一貯留層Ｂ１に熱媒体を貯留させる。   First, as shown in FIG. 1, the on-off valve 12a of the supply pipe 12 is opened and the on-off valve 13a of the delivery pipe 13 is closed. And in the state which opened and closed the means 11 of the 1st well 10, a heat medium is supplied to the 1st well 10 through the supply pipe | tube 12 from the supply apparatus 40, and a 1st storage layer B1 is made to store a heat medium.

供給装置４０から所定量の熱媒体を第一井戸１０に供給したら、図２に示すように、供給装置４０から第一井戸１０への熱媒体の供給を停止するとともに、開閉手段１１を閉じて第一貯留層Ｂ１内に熱媒体を閉じ込める。そして、第一貯留層Ｂ１内の熱媒体は地熱により加熱される。   When a predetermined amount of the heat medium is supplied from the supply device 40 to the first well 10, as shown in FIG. 2, the supply of the heat medium from the supply device 40 to the first well 10 is stopped and the opening / closing means 11 is closed. A heat medium is confined in the first reservoir B1. The heat medium in the first reservoir B1 is heated by geothermal heat.

所定時間が経過した後に、図３に示すように、供給管１２の開閉弁１２ａを閉じるとともに、送出管１３の開閉弁１３ａを開ける。そして、開閉手段１１を開くと、加熱された熱媒体は、体積を膨張させながら第一井戸１０内に流入する。   After a predetermined time has elapsed, as shown in FIG. 3, the on-off valve 12a of the supply pipe 12 is closed and the on-off valve 13a of the delivery pipe 13 is opened. When the opening / closing means 11 is opened, the heated heat medium flows into the first well 10 while expanding its volume.

第一井戸１０に流入した熱媒体は、送出管１３を通じてタービン５１内に噴出し、タービン５１の羽根に吹き付けられる。そして、熱媒体の圧力によってタービン５１の羽根が回転して発電装置５０が発電する。   The heat medium flowing into the first well 10 is jetted into the turbine 51 through the delivery pipe 13 and blown to the blades of the turbine 51. And the blade | wing of the turbine 51 rotates with the pressure of a heat medium, and the electric power generating apparatus 50 generates electric power.

なお、熱媒体は、タービン５１に吹き付けられた後に、還元管４１を通じて供給装置４０に還元され、再度、供給管１２，２２，３２を通じて各井戸１０，２０，３０に供給される。   The heat medium is blown to the turbine 51, then reduced to the supply device 40 through the reduction pipe 41, and supplied again to the wells 10, 20, and 30 through the supply pipes 12, 22, and 32.

図１から図３に示すように、前記した第一井戸１０を用いた発電と同様に、供給装置４０から第二井戸２０および第三井戸３０を通じて貯留層Ｂ２，Ｂ３に熱媒体を供給するとともに、貯留層Ｂ２，Ｂ３内で加熱された熱媒体を第二井戸２０および第三井戸３０を通じて回収し、その熱媒体によってタービン５１を駆動させて発電する。   As shown in FIGS. 1 to 3, similarly to the power generation using the first well 10, the heating medium is supplied from the supply device 40 to the reservoirs B <b> 2 and B <b> 3 through the second well 20 and the third well 30. The heat medium heated in the reservoirs B2 and B3 is collected through the second well 20 and the third well 30, and the turbine 51 is driven by the heat medium to generate electric power.

本実施形態の地熱発電方法では、三つの井戸１０，２０，３０を組み合わせて発電している。
図１に示すように、第一貯留層Ｂ１に第一井戸１０を通じて熱媒体を圧入している間に、第二貯留層Ｂ２では熱媒体を加熱するとともに、第三貯留層Ｂ３から第三井戸３０を通じてタービン５１に熱媒体を供給して発電する。 In the geothermal power generation method of the present embodiment, power is generated by combining three wells 10, 20, and 30.
As shown in FIG. 1, while the heat medium is being pressed into the first reservoir B1 through the first well 10, the second reservoir B2 heats the heat medium and the third reservoir B3 to the third well. A heat medium is supplied to the turbine 51 through 30 to generate power.

続いて、図２に示すように、第一貯留層Ｂ１で熱媒体を加熱している間に、第三貯留層Ｂ３に熱媒体を供給するとともに、第二貯留層Ｂ２から第二井戸２０を通じてタービン５１に熱媒体を供給して発電する。   Subsequently, as shown in FIG. 2, while heating the heat medium in the first reservoir B <b> 1, the heat medium is supplied to the third reservoir B <b> 3 and from the second reservoir B <b> 2 through the second well 20. A heat medium is supplied to the turbine 51 to generate power.

さらに、図３に示すように、第一貯留層Ｂ１から第一井戸１０を通じてタービン５１に熱媒体を供給して発電している間に、第二貯留層Ｂ２に熱媒体を供給するとともに、第三貯留層Ｂ３では熱媒体を加熱する。   Furthermore, as shown in FIG. 3, while supplying a heat medium from the first reservoir B1 to the turbine 51 through the first well 10 to generate power, the heat medium is supplied to the second reservoir B2, In the three reservoirs B3, the heat medium is heated.

このように、三つの井戸１０，２０，３０を通じて、各貯留層Ｂ１，Ｂ２，Ｂ３から順次に熱媒体を回収することで、タービン５１を連続して駆動することができ、発電装置５０において発電を継続することができる。   Thus, the turbine 51 can be continuously driven by sequentially recovering the heat medium from the reservoirs B1, B2, and B3 through the three wells 10, 20, and 30, and the power generator 50 generates power. Can continue.

以上のような地熱発電方法および地熱発電システム１では、図１に示すように、二酸化炭素の超臨界流体からなる熱媒体を用いているため、熱媒体の損失を抑えるとともに、周辺の地熱資源への影響を防ぐことができる。また、二酸化炭素の超臨界流体は水と混合し難いため、井戸１０，２０，３０における鉱物スケールの生成を抑えることができる。また、二酸化炭素の超臨界流体は、粘性が小さいとともに、地盤Ａ内において浮力および膨張力が大きいため、地盤Ａ内から井戸１０，２０，３０を通じて熱媒体を確実に回収することができる。さらに、貯留層Ｂ１，Ｂ２，Ｂ３に圧入された二酸化炭素の一部が地中に固定化されることで、大気中の二酸化炭素の削減に寄与することができる。   In the geothermal power generation method and the geothermal power generation system 1 as described above, as shown in FIG. 1, since a heat medium made of a supercritical fluid of carbon dioxide is used, the loss of the heat medium is suppressed and the surrounding geothermal resources are reduced. Can prevent the influence. Further, since the supercritical fluid of carbon dioxide is difficult to mix with water, the generation of mineral scale in the wells 10, 20, and 30 can be suppressed. In addition, since the supercritical fluid of carbon dioxide has low viscosity and large buoyancy and expansion force in the ground A, the heat medium can be reliably recovered from the ground A through the wells 10, 20, and 30. Furthermore, a part of the carbon dioxide injected into the reservoirs B1, B2, and B3 is fixed in the ground, which can contribute to the reduction of carbon dioxide in the atmosphere.

また、本実施形態の地熱発電方法および地熱発電システム１では、二酸化炭素の超臨界流体からなる熱媒体を井戸１０，２０，３０から貯留層Ｂ１，Ｂ２，Ｂ３に圧入し、その熱媒体を同じ井戸１０，２０，３０を通じて貯留層Ｂ１，Ｂ２，Ｂ３から回収している。
このように、単一の井戸１０，２０，３０を用いて、貯留層Ｂ１，Ｂ２，Ｂ３の同じ場所で熱媒体を圧入および回収しているため、地盤の連続性が低い場合でも、貯留層Ｂ１，Ｂ２，Ｂ３に圧入した熱媒体を確実に回収することができ、発電効率を高めることができる。 Further, in the geothermal power generation method and the geothermal power generation system 1 of the present embodiment, a heat medium made of a supercritical fluid of carbon dioxide is press-fitted into the reservoirs B1, B2, and B3 from the wells 10, 20, and 30, and the heat medium is the same. It is recovered from the reservoirs B1, B2, B3 through the wells 10, 20, 30.
Thus, since the heat medium is press-fitted and recovered at the same place in the reservoirs B1, B2, and B3 using the single wells 10, 20, and 30, the reservoir is used even when the ground continuity is low. The heat medium press-fitted into B1, B2, and B3 can be reliably recovered, and the power generation efficiency can be increased.

以上、本発明の実施形態について説明したが、本発明は前記実施形態に限定されることなく、その趣旨を逸脱しない範囲で適宜に変更が可能である。
本実施形態では、図１に示すように、三つの井戸１０，２０，３０を用いているが、井戸の数は限定されるものではなく、例えば、三つ以上または一つの井戸を用いて発電することもできる。 The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.
In this embodiment, as shown in FIG. 1, three wells 10, 20, and 30 are used. However, the number of wells is not limited. For example, power generation is performed using three or more wells or one well. You can also

１ 地熱発電システム
７ 圧力
１０ 第一井戸
１１ 開閉手段
１２，２２，３２ 供給管
１３，２３，３３ 送出管
２０ 第二井戸
３０ 第三井戸
４０ 供給装置
４１ 還元管
５０ 発電装置
５１ タービン
Ａ 地盤
Ｂ 高温岩体
Ｂ１ 第一貯留層
Ｂ２ 第二貯留層
Ｂ３ 第三貯留層 DESCRIPTION OF SYMBOLS 1 Geothermal power generation system 7 Pressure 10 1st well 11 Opening / closing means 12, 22, 32 Supply pipe 13,23,33 Delivery pipe 20 Second well 30 Third well 40 Supply apparatus 41 Reduction pipe 50 Power generation apparatus 51 Turbine A Ground B High temperature Rock body B1 1st reservoir B2 2nd reservoir B3 3rd reservoir

Claims (5)

地盤内の高温岩体に形成された貯留層に単一の井戸を通じて熱媒体を圧入および回収することで発電装置を発電させる地熱発電方法であって、
前記貯留層に前記井戸を通じて超臨界流体からなる前記熱媒体を圧入する段階と、
前記井戸の内部を遮断し、地熱により前記貯留層内で前記熱媒体を加熱する段階と、
前記井戸の内部を開放し、前記貯留層内から前記井戸を通じて前記熱媒体を回収する段階と、
前記井戸から回収した前記熱媒体によって前記発電装置のタービンを駆動して発電する段階と、を備えていることを特徴とする地熱発電方法。 A geothermal power generation method for generating power by generating and generating a heat medium by pressing and collecting a heat medium through a single well in a reservoir formed in a hot rock body in the ground,
Press-fitting the heat medium comprising a supercritical fluid through the well into the reservoir;
Shutting off the interior of the well and heating the heating medium in the reservoir by geothermal heat;
Opening the inside of the well and recovering the heat medium from the reservoir through the well; and
And a step of generating electric power by driving a turbine of the power generation device with the heat medium recovered from the well. 前記貯留層には、複数の前記井戸が設けられ、
前記各井戸のそれぞれを通じて前記貯留層に前記熱媒体を圧入および回収するように構成されており、
前記各井戸を通じて前記貯留層内から順次に前記熱媒体を回収することを特徴とする請求項１に記載の地熱発電方法。 The reservoir is provided with a plurality of the wells,
It is configured to press-fit and collect the heat medium into the reservoir through each of the wells,
The geothermal power generation method according to claim 1, wherein the heat medium is sequentially recovered from the reservoir through the wells. 前記熱媒体は、二酸化炭素の超臨界流体であることを特徴とする請求項１または請求項２に記載の地熱発電方法。   The geothermal power generation method according to claim 1, wherein the heat medium is a supercritical fluid of carbon dioxide. 地盤内の高温岩体に形成された貯留層に通じる井戸と、
前記井戸の内部を遮断および開放する開閉手段と、
前記井戸に超臨界流体からなる熱媒体を供給する供給装置と、
タービンの駆動により発電する発電装置と、を備え、
前記井戸から回収した前記熱媒体によって前記タービンを駆動させることを特徴とする地熱発電システム。 A well leading to a reservoir formed in a hot rock body in the ground,
Opening and closing means for blocking and opening the inside of the well;
A supply device for supplying a heat medium comprising a supercritical fluid to the well;
A power generation device that generates electric power by driving a turbine,
The geothermal power generation system, wherein the turbine is driven by the heat medium recovered from the well. 前記熱媒体は、二酸化炭素の超臨界流体であることを特徴とする請求項４に記載の地熱発電システム。   The geothermal power generation system according to claim 4, wherein the heat medium is a supercritical fluid of carbon dioxide.
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