DE19625113A1 - Improvement of heat exchange in closed circuit geothermal probe - Google Patents

Improvement of heat exchange in closed circuit geothermal probe

Info

Publication number
DE19625113A1
DE19625113A1 DE19625113A DE19625113A DE19625113A1 DE 19625113 A1 DE19625113 A1 DE 19625113A1 DE 19625113 A DE19625113 A DE 19625113A DE 19625113 A DE19625113 A DE 19625113A DE 19625113 A1 DE19625113 A1 DE 19625113A1
Authority
DE
Germany
Prior art keywords
cavern
filled
probe
heat exchange
salt dome
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19625113A
Other languages
German (de)
Inventor
Horst Dipl Phys Wetzel
Detlef Dr Schneider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VEAG Vereinigte Energiewerke AG
Original Assignee
VEAG Vereinigte Energiewerke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by VEAG Vereinigte Energiewerke AG filed Critical VEAG Vereinigte Energiewerke AG
Priority to DE19625113A priority Critical patent/DE19625113A1/en
Publication of DE19625113A1 publication Critical patent/DE19625113A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Method improves heat exchange to a geothermal probe. The probe is constructed as a closed system. Its outer tubular casing (4) receives water to be heated, and an internal tube (5) extracts the heated water. In the new method, the probe is introduced into a fluid-filled subterranean cavity. Preferably, the cavity (2) is made in a leached-out salt dome formation (1), or is made by leaching one out. A medium preventing further degradation of the cavity is introduced. The cavity is filled with brine, in equilibrium with that (3) of the salt dome. It may be filled with oil or gas to be stored and/or to be transferred.

Description

Die Erfindung betrifft ein Verfahren zur Verbesserung des Wärmeaustausches in einer Geothermiesonde.The invention relates to a method for improving the Heat exchange in a geothermal probe.

Die Geothermiesonde wird als geschlossenes System mit einem Mantelrohr zum Einbringen von zu erwärmendem Wasser und mit einem isolierten Innenrohr zum Ausbringen des erwärmten Was­ sers in Erdschichten eingebracht.The geothermal probe is a closed system with a Jacket pipe for introducing water to be heated and with an insulated inner tube to discharge the heated what sers introduced into layers of earth.

Dabei wurde festgestellt, daß die Übertragung der Gesteins­ wärme über die Bohrwandung und das Mantelrohr auf das Umlauf­ medium mit Verlusten verbunden ist, da das Mantelrohr nicht formschlüssig in der Bohrung angeordnet ist.It was found that the transfer of the rock heat over the drilling wall and the casing pipe to the circulation medium is associated with losses since the jacket tube is not is positively arranged in the bore.

Zur Verbesserung des Wärmeaustausches und/oder Wärmeübergan­ ges ist es daher bekannt, zwischen Bohrwandung und Mantelrohr ein die Wärmeleitung verbesserndes Mittel einzubringen und/oder den Bohrungsdurchmesser sowie damit den Mantelrohrdurch­ messer zu vergrößern (DE 43 29 269, 41 15 431, 38 01 933). Dies er­ fordert erhebliche Aufwendungen an Zeit und Kosten für die Herstellung der Geothermiesonde, ohne daß wesentliche Vortei­ le entstehen.To improve heat exchange and / or heat transfer It is therefore known between the drilling wall and the casing pipe to introduce a heat-improving agent and / or the bore diameter and thus the jacket pipe diameter knife to enlarge (DE 43 29 269, 41 15 431, 38 01 933). This he calls for considerable expenditure of time and costs for the Production of the geothermal probe without significant advantages le arise.

Der Erfindung liegt daher die Aufgabe zugrunde, die Gesteins­ wärme durch eine Konvektion wesentlich verbessert zu nutzen.The invention is therefore based on the object, the rock to use heat significantly improved by convection.

Dies wird dadurch erreicht, daß erfindungsgemäß die Geother­ miesonde in eine mit einem fluiden Medium gefüllte Kaverne eingebracht wird. This is achieved in that the geothermally miesonde into a cavern filled with a fluid medium is introduced.  

Durch die Erfindung wird gewährleistet, daß der für die Wär­ meübertragung verantwortliche Durchmesser der Geothermiesonde und insgesamt die Wärmeleitung wesentlich erhöht wird.The invention ensures that the heat diameter of the geothermal probe responsible and overall the heat conduction is significantly increased.

Es ist zwar bekannt, Untertage-Hohlräume eines Bergwerkes zur Wärmeerzeugung zu nutzen (DE 42 34 367, 41 31 989, 41 27 161, 38 01 933), jedoch bedarf es dazu erheblicher anlagen- und bau­ technischer Aufwendungen innerhalb und außerhalb des Bergwer­ kes. Eine Übertragung auf die Lösung des vorliegenden Pro­ blems war jedoch nicht gegeben.Although it is known to mine underground cavities Use heat generation (DE 42 34 367, 41 31 989, 41 27 161, 38 01 933), however this requires considerable plant and construction technical expenses inside and outside the mine kes. A transfer to the solution of the present pro However, there was no blems.

Anhand eines Ausführungsbeispiels wird die Erfindung näher erläutert. Die dazugehörige Zeichnung zeigt den Schnitt des Salzstockes mit Geothermiesonde.The invention will be explained in more detail using an exemplary embodiment explained. The accompanying drawing shows the section of the Salt dome with geothermal probe.

Im Salzstock 1 ist durch Auslaugung die Kaverne 2 gebildet worden. Die Kaverne 2 ist mit der im Gleichgewicht befindli­ chen Sole 3 des Salzstockes 1 gefüllt. In die Kaverne 2 wird das geschlossene Mantelrohr 4 mit dem isolierten Innen­ rohr 5 eingebracht. In der Kaverne bildet sich der interne konvektive Wärme-Kreislauf 6 aus, über den die Salzstock­ wärme 7 in freier Konvektion auf das Mantelrohr 4 und damit auf das Umlaufmedium 8 übertragen wird.Cavern 2 was formed in salt dome 1 by leaching. The cavern 2 is filled with the brine 3 in equilibrium of the salt dome 1 . In the cavern 2 , the closed jacket tube 4 with the insulated inner tube 5 is introduced. The internal convective heat circuit 6 is formed in the cavern, via which the salt dome heat 7 is transferred in free convection to the casing tube 4 and thus to the circulating medium 8 .

Wird in den Ringraum 9 zwischen Mantelrohr 4 und isoliertem Innenrohr 5 kaltes Wasser 11 eingebracht, so erwärmt sich dieser und wird als warmes Wasser 10 in an sich bekannter Weise genutzt.If cold water 11 is introduced into the annular space 9 between the casing tube 4 and the insulated inner tube 5 , it heats up and is used as warm water 10 in a manner known per se.

Salzstöcke großer Mächtigkeit bringen große Effekte aufgrund des hohen Wärmeangebotes, z. B. 8 Watt/K/m. Salt sticks of great thickness bring great effects the high heat supply, e.g. B. 8 watts / K / m.  

Mehrere kleinere Salzstöcke mit dazwischen liegenden Schich­ ten reduzieren das Wärmeangebot und erfordern außerdem noch besondere Schutzmaßnahmen.Several smaller salt domes with layers in between ten reduce the supply of heat and also require special protective measures.

Ebenso ist es möglich, die Kaverne 2 mit einer Flüssigkeit oder einem Gas zu füllen, wobei über ein gesondertes Be­ triebssystem ebenso zu speicherndes und/oder zu förderndes Erdöl und/oder Erdgas in die Kaverne 2 einzubringen sind.It is also possible to fill the cavern 2 with a liquid or a gas, with a separate operating system also to be used to store and / or extract crude oil and / or natural gas into the cavern 2 .

Durch die Erfindung werden folgende Vorteile erreicht:The following advantages are achieved by the invention:

  • 1. Aufgrund des großen Durchmessers der Kaverne und der Fül­ lung ist ein wesentlich größeres Wärmeangebot nutzbar und die Wärmeleistung verbessert.1. Due to the large diameter of the cavern and the filling a much larger supply of heat can be used and improves thermal performance.
  • 2. Wird Sole oder Erdgas und/oder Erdöl als Füllung verwen­ det, tritt keine Korrosion ein, da keine weiter Lö­ sung des Salzstockes erfolgt (Stillstand, Gleichgewicht).2. If brine or natural gas and / or petroleum is used as filling no corrosion occurs since there is no further soldering Solution of the salt dome takes place (standstill, balance).
  • 3. Da keine Sole entnommen wird, treten vorher genannte Ef­ fekte ebenfalls ein.3. Since no brine is removed, the aforementioned ef occur also work.
  • 4. Eine für die Öl- und/oder Gas-Speicherung und/oder -För­ derung genutzte Sole ist für die Geothermie und umgekehrt nutzbar.4. One for oil and / or gas storage and / or for brine is used for geothermal energy and can be used in reverse.
  • 5. Verringerung des Bohraufwandes zur Herstellung der Geo­ thermiesonde durch Nutzung der Kaverne.5. Reduction of the drilling effort for the production of the geo thermal probe by using the cavern.

BezugszeichenlisteReference list

1 Salzstock
2 Kaverne
3 Sole
4 Mantelrohr
5 Innenrohr
6 Wärme-Kreislauf
7 Salzstockwärme
8 Umlaufmedium
9 Ringraum
10 warmes Wasser
11 kaltes Wasser 1 salt dome
2 caverns
3 brine
4 jacket tube
5 inner tube
6 heat cycle
7 salt dome heat
8 circulating medium
9 annulus
10 warm water
11 cold water

Claims (6)

1. Verfahren zur Verbesserung des Wärmeaustausches in einer Geothermiesonde, wobei die Sonde als geschlossenes System mit einem Mantelrohr zum Einbringen von zu erwärmenden Wasser und mit einem Innenrohr zum Ausbringen von erwärmten Wasser ver­ sehen ist, gekennzeichnet dadurch, daß die Geothermiesonde in eine mit einem fluiden Medium ge­ füllte Kaverne eingebracht wird.1. A method for improving the heat exchange in a geothermal probe, the probe is seen as a closed system with a jacket tube for introducing water to be heated and with an inner tube for dispensing heated water, characterized in that the geothermal probe in a with a fluid Medium-filled cavern is introduced. 2. Verfahren nach Anspruch 1, gekennzeichnet dadurch, daß die Kaverne in einem ausgelaugten Salzstock eingebracht wird.2. The method according to claim 1, characterized in that the Cavern is placed in an exhausted salt dome. 3. Verfahren nach Anspruch 1, gekennzeichnet dadurch, daß die Kaverne durch Auslaugung eines Salzstockes gebildet wird.3. The method according to claim 1, characterized in that the Cavern is formed by leaching a salt dome. 4. Verfahren nach Anspruch 1 bis 3, gekennzeichnet dadurch, daß ein den weiteren Abbau der Kaverne verhinderndes Medium eingebracht wird.4. The method according to claim 1 to 3, characterized in that that a medium preventing further dismantling of the cavern is introduced. 5. Verfahren nach Anspruch 1 bis 4, gekennzeichnet dadurch, daß die Kaverne mit der im Gleichgewicht befindlichen Sole′ des Salzstockes gefüllt wird.5. The method according to claim 1 to 4, characterized in that that the cavern with the brine in equilibrium ' of the salt dome is filled. 6. Verfahren nach Anspruch 1 bis 4, gekennzeichnet dadurch, daß die Kaverne mit einem zu speichernden und/oder zu för­ dernden Öl oder Gas gefüllt wird.6. The method according to claim 1 to 4, characterized in that that the cavern with a to be stored and / or för changing oil or gas is filled.
DE19625113A 1996-06-14 1996-06-14 Improvement of heat exchange in closed circuit geothermal probe Withdrawn DE19625113A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19625113A DE19625113A1 (en) 1996-06-14 1996-06-14 Improvement of heat exchange in closed circuit geothermal probe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19625113A DE19625113A1 (en) 1996-06-14 1996-06-14 Improvement of heat exchange in closed circuit geothermal probe

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DE19625113A1 true DE19625113A1 (en) 1997-12-18

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2434200A (en) * 2006-01-14 2007-07-18 Roxbury Ltd Heat exchanger component for a geothermal system
DE102007033436A1 (en) * 2007-07-18 2009-01-22 Kessels, Winfried, Dr. Geothermal probe for use in heating system of e.g. house, for extracting heat energy from underground, has annular space hydraulically excited for increasing heat transport from rock mass e.g. aquifer, to heat exchanger e.g. coaxial pipe
DE102008007627B3 (en) * 2008-02-04 2009-07-30 Tutech Innovation Gmbh geothermal plant
US20220356862A1 (en) * 2019-11-15 2022-11-10 Hans Gude Gudesen Solution mined cavity system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2434200A (en) * 2006-01-14 2007-07-18 Roxbury Ltd Heat exchanger component for a geothermal system
DE102007033436A1 (en) * 2007-07-18 2009-01-22 Kessels, Winfried, Dr. Geothermal probe for use in heating system of e.g. house, for extracting heat energy from underground, has annular space hydraulically excited for increasing heat transport from rock mass e.g. aquifer, to heat exchanger e.g. coaxial pipe
DE102008007627B3 (en) * 2008-02-04 2009-07-30 Tutech Innovation Gmbh geothermal plant
US20220356862A1 (en) * 2019-11-15 2022-11-10 Hans Gude Gudesen Solution mined cavity system
US11920550B2 (en) * 2019-11-15 2024-03-05 Hans Gude Gudesen Solution mined cavity system

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8141 Disposal/no request for examination