LU81670A1 - METHOD FOR OBTAINING GROWTH AND DEVICE FOR CARRYING OUT THIS METHOD - Google Patents

Description

- ..- • Τ 'D. 50.773

ή jj "Τ '^ GRAND-DUCHÉ DE LUXEMBOURG

IQ / Qf du 3.0 septembre 19-7 £ vlJUl «Monsieur le Ministre r ôvflsEj de l’Économie Nationale et des Classes Moyennes

Service de la Propriété Industrielle 'LUXEMBOURG

Demande de Brevet d'invention

Tu I. Requête

..... Monsieur ..... Arthur ..... FEIST. ,, .....- Weidenweg ..... 9Γ ..... à..5o6o .... BERGISCH .. ..GLÂDBACH ......... (D

...... 3T •• Allemagne · Fédérale r ..... représenté, par Monsieur..Jacques ..... dè ................... .......

..... Muyser ·, ..... agis sant ~ -en ·. qualité .de-mandataire ............................................. ................................... (2) dépose ce dix .... Septembre 19oo ... soixante-dix-neuf ------------------------------- ©) à ......... 15. ........... .... heures, au Ministère de l'Économie Nationale et des Classes Moyennes, à Luxembourg: 1. la présente requête pour l'obtention d'un brevet d'invention concernant: ...... iî.V-erfaiiren ... for geothermal energy · -and ^ .... device ~ «ur-J> urch = -— (4) * .......... leadership ..... this .... procedure. ".. * ................................ .................................................. .................................................. ................

déclare, en assumant la responsabilité de cette déclaration, que l '(es) inventeur (s) est (sont): ...... le.déposant ................ .................................................. .................................................. .................................................. ......................................... (5) 2. la délégation de pouvoir , datée de BERGISCH-CTADRACH.— le 5 ..... Sep.t £ mhre .... l9..7.9 3. la description en langue .............. allemande. ............................ de l'invention en deux exemplaires; 4 ............. 2 ................ planches de dessin, en deux exemplaires; 5th la quittance des taxes versées au Bureau de l'Enregistrement à Luxembourg, le lo ... septembre 1979 --------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- ---------- (6) ..................................... .................................................. ........ déposée (s) en (7) .................................. .................................................. ......................................

le ................................................. .................................................. .................................................. ................ (8) au nom de ........... (9) élit domicile pour lui (elle) et, si désigné, pour son mandataire, à Luxembourg ________________________________ ...... 3Sy -bid ... .Royal ............................... .................................................. ................................................. ( io) sollicite la délivrance d'un brevet d'invention pour l'objet décrit et représenté dans les annexes ^ usmartin ^^ cette délivrance à ...... · // ............ ........ ----------- mois.

EL Procès-verbal de Dépôt • La susdite demande de brevet d'invention a été déposée au Ministère de l'Économie Nationale et des Classes Moyennes, Service de la Propriété Industrielle à Luxembourg, en date du: —3 o septembre 1979 ... ....... Pr. le Ministre à __________ 15 ..________ heures / \ de l’Économie Nationale et des Classes Moyennes, / '· p. d.

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A 68007 ........ '»D. 5o.773

PATENT APPLICATION

in

Luxembourg

Applicant: Mr. Arthur FEIST

Subject: "Process for geothermal energy extraction and device for carrying out this process".

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Process for geothermal energy extraction and device for carrying out this process

It is known that the temperature inside the earth is higher than 'j on its surface. The so-called geothermal j

Depth level according to which the temperature rises by about 3 ° per 100 m j. In mines, where the temperature is around 60 ° and more at a depth of 2000 m j, the j geothermal depth level brings only disadvantages and makes work difficult underground. However, the geothermal depth level has great advantages for today's efforts to develop new energy sources: advantages. Geothermal energy offers itself as a new energy source. The engineer has the task of transporting geothermal energy from the interior of the earth to the surface of the earth with the simplest possible means and with the least possible energy expenditure.

This object is based on the following invention. A method and a device are to be created with which the heat from the interior of the earth can be exploited on the earth's surface. Well-known mining technology measures are used to bring boreholes into the ground, with pipes; to undress and the like.

! ! The basic solution to the problem arises; according to the invention, by a method according to which liquid heat transfer medium is cold introduced into a borehole j and absorbed heat from the surrounding area. led the earth to the deepest hole, turned there by 180 °! | steers and from the embedded cold heat transfer medium | separates carried up in the borehole and for the acceptance of the heat is conducted out of it. Water is a suitable heat transfer medium. Of course, other liquids can also be used if better thermal properties are in the foreground and justify higher costs.

For the sake of simplicity, however, only water will be spoken of in the following.

In the method according to the invention, a system of communicating tubes is formed in the borehole. These are at their bottom!

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'! "! -2- I 1 ends connected to each other at the bottom of the borehole. Cold water is introduced into the upper:; end of one tube. It is assumed that;! It sinks down due to natural gravity it flows along the borehole wall, which is surrounded by soil with increasing temperature as the depth rises. The heat from the earth is transferred to the downward flowing

Water and increases its temperature. With the same tube cross-section, its flow velocity also increases. At the deepest of the borehole, the water enters the other tube and rises in it: upwards. The system of the two communicating tubes leads to the water being in one tube without external influence; flows down and up in the other tube. The larger ’: volume of warm water leads in the last mentioned tube i! to a higher flow rate. This sets in; Sucked down the flowing water in one tube.

A natural cycle results without additional pumping power. The temperature to which the water in this circuit is heated by the soil depends on the depth of the drilling j i

: holes and on the amount of heat transfer achievable. J

i At a depth of 1000 m, the water is theoretically heated by 30 °. If the resulting outlet temperature i j of the water is not for its immediate use e.g. for home! enough rooms, a heat pump is switched on. The flow obtained through natural gravity through the two communicating tubes can also be supported by an additional pump.

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Some arrangements are available for carrying out the method according to the invention. Basically, an arrangement according to the invention is characterized by a hole made in the rock and a pipe arranged therein leaving an annular space with openings provided in its wall in its lower region. The annular space between the borehole wall and the pipe forms the tube for the downward flowing water, which absorbs heat directly from the surrounding mountains. At the lower end of the borehole or the annular space, this warmed-up water enters the pipe through the openings and flows upwards in this “3- j. | i i; |

The borehole is made in a known manner with a borehole chisel,! a rod, etc. In general one does not become a | encounter solid mountains, such as granite or bedrock. That means that the borehole is cased or lined with pipes. The result is a jacket pipe that lies against the wall of the borehole and extends deepest down to the borehole. So that the pipe, which forms the pipes for the 'upward flowing water, concentric in this man-; Telrohr sits and thus favorable flow conditions occur, according to the invention radially extending j

Spacers arranged that abut the casing tube and the j

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Hold the pipe concentrically in this.

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As soon as the borehole has been lowered to the desired depth and the borehole wall has been cased, the borehole must be at its lower end; be sealed. According to the invention, this is made of a sealing material, e.g. a plastic sealing mortar existing:

Graft provided that the lower end of the casing tube and ge; possibly also fills or displaces the mountains below. For this purpose, the sealing material is poured into the casing tube from above after the drill hole has been piped and the drill bit with the rod has been removed. Then i | the other tube, which consists of individual sections ‘kJ screwed together, is lowered to this plug.

The jacket tube preferably consists of individual metal tube sections. They have the necessary strength and also allow good heat transfer from the mountains to the downward flowing water. The pipe lying concentrically in the jacket pipe preferably consists of individual plastic pipe sections, to which the spacers can be molded. A plastic with low thermal conductivity is expediently used. Then the warm water flowing upward substantially maintains its temperature and is not excessively cooled by the cold water flowing downward. As stated, with the same cross-section of the two tubes, the upward flowing water has a higher speed than the downward flowing water. This lowers ί -4-, the dwell time of the upward flowing water in which it leads-; : the pipe. Accordingly, there is also little time available during which it transfers its heat to the cold water flowing down! ί could give. The arrangement according to the invention thus works with |

'' high thermal efficiency. J

The embodiment just described, as stated, is used with v non-stable mountains. The casing pipe represents a lost formwork and at the same time forms the pipe or; the flow pipe for the water flowing downwards. Its large surface area ensures good heat transfer from the mountains to the downward flowing water without special effort. With stable mountains, such as granite or undisturbed primary rock, the casing pipe represents an unnecessary cost factor and can be omitted. A second embodiment i is provided for such stable mountains, which likewise has a hole drilled in the mountains has and is characterized by at least one pipeline arranged in the bore from a pipeline leading down to the deepest hole of the borehole, reversing its direction there and then leading up again, and filling the cavities between the borehole wall or mountains on the one hand and the pipeline on the other hand thermally conductive material. With this j

Embodiment, the downward tube or the 'downward pipe string are identical to the upward one! f ". 'tube or the upward-extending pipe string. The thermal efficiency is therefore less than in the first embodiment.

However, since the mountains are still standing and the borehole remains open, there is no piping and the cost of sinking the borehole is also lower. With the same financial outlay, several wells can be sunk. This results in the same thermal yield with the same financial outlay.

If the water has a lower temperature than the surrounding mountains when it enters the downward pipe string - and only then does the desired heat release from the mountains come and go - it is recommended that the downward pipe string has a larger cross-section than the upward pipe string having.

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The larger cross-section can be replaced by a larger \

Diameter as well as formed by several tubes.

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In order to achieve the largest possible area in a borehole for the transfer of heat from the mountains to the water, according to the invention two or more pipes are used, each with a downward and one. arranged upward leading pipe string in a hole.

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The heat transfer from the mountains to the water largely depends on a good filling of the cavities. For backfilling, the heat-conducting material is poured into the borehole f. ~ After the pipes have been introduced. Care must be taken to ensure that 1 the backfill material falls to the bottom of the borehole and builds up evenly from there. If the pipes are eccentric! or not running in the borehole, there is a risk that! the backfill material entrains mountains or that it does not fall through and air pockets form. Both hinder good heat transfer. For precise fixation of the pipe strands, horizontally extending spacer webs are therefore provided according to the invention at vertical intervals between them. These keep the pipe strings at the desired mutual distance and secure their central position in the borehole. With such a position of the pipe strings, the backfill material poured in between them falls through to the bottom of the borehole. From there the Ver * -w! filling material on top and falls and slips between the

Pipe strings radially downwards and fill the borehole without damaging the wall. In detail, it is provided according to the invention that the pipe strands are composed of individual pipe sections and the spacing webs running between them have a length of at least 2.5 times the grain size of the material forming the backfill. Then it is ensured that the filler material poured in between the pipe strands falls radially outwards past them and slides and fills all the hollow spaces in the borehole.

The invention is further described using the example of the embodiment shown in the drawing. In the drawing is: »i · \. i -6-

Pigur 1 is a side view, partially cut away, of the first; Embodiment of the arrangement with the inserted into the borehole: i

Jacket tube and inner tube not yet introduced, l i! Figure 2 is a side view of the same embodiment, partly in section, after inserting the inner tube, t

Figure 3 is a cross section along the section line III-III in;

FIG. 2, FIG. 4 shows a cross section along the section line IV-IV in FIG. 2. FIG. 5 shows a side view, partially cut away, of the second FIG

Embodiment without casing pipe with already partially lowered j l inner pipes, j i

Figure 6 is a side view, partly in section, of the same j; Embodiment in the final state with the inner part completely lowered \ i pipes and backfilling,! i!

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7 shows a cross section along the section line VII-VII in FIG. ! 8 shows a cross section along the section line VIII-VIII in FIG

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i FIG. 9 is a top view of the embodiment according to FIGS. 5: and 6 with a larger cross section of the downward pipe strings of the pipelines, and i i FIG. 10 is a top view of the same embodiment with arrangement of a total of 3 pipelines.

! The soil or mountains 12 are shown in FIGS. 1 and 2.

A borehole 14 is lowered into this. The borehole 14 is lined with a casing tube 16. It consists of individual metal pipe sections screwed together. For a better overview, these are not shown in detail in FIG. 1. The middle tube 18 is lowered into the jacket tube 16 to form the annular space 20. Radial spacers 22 't -) -7- * ί sit on the tube 18

At the lower end of the borehole 14 or the casing tube 16 there is a plug 24 made of sealing material. It closes the deepest hole, which is designated 26. In its lower area.

j ', the inner tube 18 has the openings 28. i i |

To produce this embodiment of the arrangement according to the invention shown in FIGS. 1 and 2 and the associated sections 3 and 4, a borehole is sunk in a conventional manner. It is piped with metal pipe sections. These ! stop and form the casing pipe 16. After the sinking, a sealing material is poured into the borehole. It forms the plug 24. Then the inner tube 18 is up to the |

Downhole 26 lowered. It also consists of individual sections screwed together. The lower sections have the openings 28. !

Cold water, e.g. the cold water flowing out of a building heater is introduced into the annular space 20. This is indicated by the two arrows drawn above in FIG. 2. The cold water falls down in the ring chamber 20. It absorbs the heat that is given off from the mountain 12 via the metallic jacket tube 16. Its temperature rises. In the lower area of the borehole 14, the warm water now flows over the openings!

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j28 into the inner tube 18. The Q 'in the lower part of FIG. 2 and the arrows drawn in FIG. 4 show this transition jan. The warm water flows upward in the inner tube 18 and (is removed at the upper end thereof. The above-described embodiment of the arrangement according to the invention is used for mountains | which would collapse into the borehole so that this is lined with the casing tube 16 must become.

The embodiment described in the following according to FIGS. 5 to 10, on the other hand, is used with stable mountains.

In the embodiment shown in FIGS. 5 to 10, the piping of the borehole 14 is omitted since the rock 12 is stable. FIG. 5 shows the borehole 14, the deepest borehole 26 of which is not closed with a plug 24, but remains open. FIG. 5 shows the arrangement with pipelines 30 that have already been partially lowered. As the section in FIG. 7 in particular shows, there are two pipelines 30, each with a downward pipe string 32 and an upwardly directed pipe string 34 these at a precise distance from each other. After complete lowering j of the pipelines 30, they assume the position shown in FIG. 6. Now the material forming the backfill 38 is poured in. It is a mortar with good heat-conducting properties. It is poured between and to the side of the pipe strings into the borehole. After hitting the deepest hole 26, it builds up. Finally, rising from below, it fills out all i - “cavities in borehole 14. This results in an intimate heat-conducting connection between the rock 12 and the pipe strings.

As the arrows in FIG. 6 indicate, cold water is introduced into the downward pipe strings 32. It flows into these below and absorbs the heat given off by the mountains 12. At the bottom of the borehole 26, the water enters the pipe strands 34 leading upwards. There, too, it will absorb further heat as long as its temperature is still below that of the mountains 12. Finally, it is removed as warm water at the upper ends of the tubing strings 34.

The cross sections in FIGS. 7 and 8 show those in the figures! The embodiment shown in FIGS. 5 and 6, in which the downward and upward pipe strings have the same cross section. FIG. 9 shows an embodiment in which the downward pipe strings 32 have a larger cross section than the upward pipe strings 34. This measure causes, among other things, that the warm water in the pipe strings 34 assumes a higher speed. This shortens the time during which it can give off heat to the areas 12 in which its temperature is higher than that of the mountains 12. This improves the thermal efficiency.

An arrangement is shown in FIG. 10, in which instead of two pipes are now provided, each with a pipe branch 32 and 34 leading downwards and upwards.

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The borehole depths that can be used in the invention are theoretically not limited. In practice, however, there is a lower hole depth of perhaps 1,000 m and an upper hole depth of 'maybe 2,000 m. If the borehole depth is less than approximately 1,000 m, the temperature is too low, and if the borehole depth is greater than 2,000 m, the costs become too high. The diameter of the borehole and the pipes are generally in the range of 100! fall up to 400 mm. The pumps that are used under certain circumstances and that support the water flow have only a very low output. The buoyancy resulting from the lower specific weight of the heated water is generally sufficient for the circulation of the water. A pump only needs to compensate for the ί ’flow losses. Accordingly, their performance is low. y! i i i • ί l 'i l! i! i

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Claims (14)

1. A method of extracting geothermal energy, characterized in that a liquid heat transfer medium is cold introduced into a borehole introduced into the earth and is carried out by absorbing heat from the surrounding earth to the borehole, deflected there by 180 ° and cold from the let-in Warmth! I transmission means carried up separately in the borehole and to the! i Decrease in the absorbed heat is conducted out of it. j 2. The method according to claim 1, characterized by the use i of water as a heat transfer medium. 3. The method according to claim 1, characterized in that the durcji »* · the natural gravitational flow of the heat transfer medium is supported by a pump. . 1 4. Arrangement for performing the method according to claims 1-3, characterized by a in the mountains (12) introduced borehole (14) and in this with an annular space (20) arranged tube (18) with in its lower loading - | openings in its wall (28). I I 5. Arrangement according to claim 4, characterized by an in the Bohrj-hole (14) introduced, lying on the wall and up to; Casing tube reaching deepest in the borehole (16). | ! i : 6. Arrangement according to claim 4 and 5, characterized by on the j! The circumference of the tube (18) arranged radially extending distance! Holders (22) which abut the jacket tube (16) and which hold the tube (18) concentrically in the jacket tube (16). ! 7. Arrangement according to claim 4-6, characterized in that a • consisting of a sealing material plug (24) the j lower end of the casing tube (16) and possibly also! fills or displaces the mountains below. 8. Arrangement according to claim 4-7, characterized in that the jacket tube (16) consists of metal tube sections. ; -2- 4 f 9. Arrangement according to claim 4-8, characterized in that the tube (18) composed of plastic frohr-sections. : t and the spacers (22) are molded onto them. 10. Arrangement for carrying out the method according to claims 1-3, characterized by a in the mountains (12) v v bore (14), at least one in the borehole (14) arranged pipeline leading down to the deepest hole (26) , there its direction reversing and then up again leading pipe string (32, 34) and with a filling (38) filling the cavities between the borehole wall and pipe made of heat-conducting material. * 11. The arrangement according to claim 10, characterized in that the downward pipe string (32) has a larger cross-section than the upward pipe string (34). 12. The arrangement according to claim 10, characterized in that two or more pipes (30), each with a downward and upward leading pipe string (32,34) are provided. 13. Arrangement according to claim 10-12, characterized by spacing webs (36) running horizontally between the pipe strands (32, 34) at vertical intervals. 14. Arrangement according to claim 10-13, characterized in that the pipe strands (32, 34) are composed of individual pipe sections and the spacer webs (36) have a length of at least: 2.5 times the grain size of the backfill (38) have forming material. ] =. i; ! i i: l!