CN105674608A - Device and method for extracting and utilizing geothermal energy - Google Patents
Device and method for extracting and utilizing geothermal energy Download PDFInfo
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- CN105674608A CN105674608A CN201610089983.XA CN201610089983A CN105674608A CN 105674608 A CN105674608 A CN 105674608A CN 201610089983 A CN201610089983 A CN 201610089983A CN 105674608 A CN105674608 A CN 105674608A
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- outer tube
- heat
- liquid
- pit shaft
- liquid medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/30—Geothermal collectors using underground reservoirs for accumulating working fluids or intermediate fluids
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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
- 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
Abstract
The invention relates to a device and a method for extracting and utilizing geothermal energy. The device for extracting and utilizing the geothermal energy, disclosed by the invention, comprises a shaft, an outer tube, a liquid inlet tube, a liquid outlet tube and a heat exchange device; the top part and the bottom part of the shaft are separately unenclosed, and the bottom part of the shaft goes deep into a geothermal energy rock stratum; a first liquid medium is held in the shaft and the outer tube; the top part of the outer tube is enclosed, and the bottom part of the outer tube is unenclosed; the outer tube is fixedly sheathed in the shaft; the upper part of the outer tube is a heat exchange section, the middle part of the outer tube is a thermal insulation section, and the lower part of the outer tube is a heat absorption section; the heat absorption section is located in the geothermal energy rock stratum; the heat exchange device is arranged at the outer side of a position corresponding to the heat exchange section of the outer tube; one end of the liquid outlet tube is connected with the liquid outlet of the outer tube, and the other end of the liquid outlet tube is connected with the liquid inlet of a heat supply system; the liquid outlet end at the bottom part of the liquid outlet tube penetrates through the top part of the outer tube and extends into the shaft and communicates with the first liquid medium; and the top part of the liquid inlet tube is connected with the liquid outlet of the external power supply system. The device disclosed by the invention is high in heat efficiency, simple in structure, low in cost, and the like.
Description
Technical field
The present invention relates to field of new energy utilization, particularly relate to the device and method of a kind of extraction and application Geothermal energy.
Background technology
At present, the whole world is all at searching green energy resource. Sun power, wind energy are comparatively universal, and Geothermal energy also result in the extensive concern of people. Geothermal energy resources are mainly divided into hot water type and xeothermic lithotype, and wherein, the xeothermic rock stratum of middle high temperature or high-gradient ground temperature stratum, the standing stock on the earth are very abundant. But, the exploitation of ground thermal technology is unsatisfactory.
Because characteristics such as xeothermic rock do not have perviousness and do not have hole, and reservoir position is dark, current technology mostly is artificial pressure break and manufactures formation fracture, utilizes the method for water filling output. Usually need many mouthfuls of wells with the use of, such as, injecting the lower water of well high pressure implantation temperature, make water along the artificial flow in fracture of rock; Bore one or more well for reclaiming high-temperature water, vapour etc. in another location simultaneously. Expending more and there is the problems such as utilising efficiency is low, equipment is complicated, cost height, concrete manifestation exists: underground heat extraction efficiency is generally at about 1-5%, and underground heat exchange loses fluid rate height (greatly between 7%-12%). Therefore, be badly in need of a kind of efficiency height, structure is simple, cost is low Geothermal energy extractive technique.
Summary of the invention
In view of the problem existing for prior art, the present invention provides the device and method of a kind of extraction and application Geothermal energy, may be used for underground xeothermic rock area or the higher area of underground temperature gradient realizes the big area exploitation of Geothermal energy, have that efficiency height, structure are simple, low cost and other advantages.
The technical scheme that the present invention solves the problems of the technologies described above is as follows:
A device for extraction and application Geothermal energy, comprising: pit shaft, outer tube, liquid-inlet pipe, drain pipe and heat-exchanger rig; The equal opening in the top of pit shaft and bottom, and geothermal source rock stratum is goed deep in the bottom of pit shaft, and described pit shaft and outer tube are built with first liquid medium;
The top seal of outer tube, bottom opening; Described outer tube sleeve is located in pit shaft, and described outer tube is fixed by cementing concrete ring and pit shaft, and the top of described outer tube is heat exchanging segment, and the middle part of described outer tube is holding-zone, and the bottom of described outer tube is endotherm section, and described endotherm section is positioned at geothermal source rock stratum;The outside of the position corresponding with outer tube heat exchanging segment is provided with heat-exchanger rig, and described heat-exchanger rig is built with second liquid medium;
One end of described drain pipe is connected with the inside of outer tube, and the other end of described drain pipe is connected with the fluid inlet of outside heating system;
The lower end of described liquid-inlet pipe stretches to below outer tube bottom or bottom and is connected with first liquid medium from the top of outer tube, and the upper end of described liquid-inlet pipe is connected with the liquid outlet of outside heating system.
The invention has the beneficial effects as follows: outer tube is set in pit shaft, it it is holding-zone in the middle part of outer tube, the top of outer tube is radiating segment, the bottom of outer tube is endotherm section, the placement degree of depth of outer tube, it is possible to the characteristic of thermal source section stratum, base area rock of borehole determines, if geothermal source rock stratum is high-density tight stratum, pit shaft is fairly regular, and the bottom of outer tube can be placed on below the top of geothermal source rock stratum. This kind of design can save the consumption of outer tube, expands the mineshaft diameter of endotherm section simultaneously, and heat absorption efficiency can significantly improve. First liquid medium in pit shaft and outer tube is after the heat of geothermal source rock stratum, partially liq undergoes phase transition, become steam molecule, produce high-temperature steam air-flow, to the top rapid increase of pit shaft, owing to steam molecule is in the state of disorderly thermal motion, collide with the liquid level of the tube wall of outer tube and first liquid medium, part steam molecule returns to in first liquid medium, along with evaporation continue carry out, steam molecule density in outer tube constantly increases, and finally reach capacity state. The top seal of outer tube, makes the pressure increase in outer tube, rise in temperature. And the setting due to holding-zone so that in steam molecule transmittance process, thermosteresis is almost nil. After saturation steam reaches steady state, in pit shaft, the top of first liquid medium and the temperature of bottom are substantially close. The heat of part saturation steam is when being passed to radiating segment, and the second liquid medium in heat exchanging device heats, can be used for after second liquid medium ebuillition of heated generating, heat supply etc. all for needing the occasion of thermal source. Some saturation steam, by drain pipe, is delivered in outside heating system for heat supply. Simultaneously, liquid-inlet pipe one end is connected with outside heating system, and the other end of liquid-inlet pipe is connected with the inside of outer tube, the medium (such as water) that relative temperature heating system being produced by the setting of liquid-inlet pipe is lower, enter to again in outer tube, carry out recycle by high-pressure pump.
In said process, if heat-up time is shorter, or when the temperature of geothermal source rock stratum is not high especially, the first liquid medium of outer tube after heating, it is possible to directly enter into heating system through drain pipe in fluid form.
The present invention only needs a pit shaft, a liquid-inlet pipe, a drain pipe, an outer tube just can realize said process, and floor space is little; Outer tube or uncased wellbore is adopted directly to make first liquid medium absorb underground heat, it is not necessary to other conduction material transferring heat energy, first liquid medium heated surface area is big, and heat absorption rate obviously increases.
The present invention extracts the technology of Geothermal energy, extracts Geothermal energy more than 90 percent, and thermosteresis is below ten percent.
Therefore, the device of extraction and application Geothermal energy of the present invention, has that structure is simple, cost is low, heat production advantages of higher. No matter it is generating or heat supply, all without the need to output and the injection of underground water, really achieves pollution-free and zero release.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described endotherm section also comprises pit shaft corresponding to thermal source layer position fine and close in height.
Preferably, described endotherm section can be the bottom of outer tube, it is also possible to be the open hole section of high fine and close thermal source layer.
Further, the bottom of described holding-zone is positioned at geothermal source rock stratum, and the top of described holding-zone is positioned at the lower section of heat-exchanger rig.
The useful effect of above-mentioned further scheme is adopted to be: endotherm section is uncased wellbore, it is possible to energy efficiency more, and the bottom of holding-zone is positioned at the lower section at the top of geothermal source rock stratum, avoids calorific loss; The top of described holding-zone is positioned at the lower section of heat-exchanger rig, is conducive to strengthening heat exchange.
Further, the second liquid medium in described heat-exchanger rig by after ebuillition of heated for entering generating set and/or heating plant.
The useful effect of above-mentioned further scheme is adopted to be: the demands such as generating, heat supply can be met.
Further, the top of described outer tube is provided with thermometer.
The useful effect of above-mentioned further scheme is adopted to be: to be convenient to monitor at any time the temperature in outer tube.
Further, described geothermal source rock stratum is xeothermic rock stratum or high underground temperature gradient stratum.
Adopting the useful effect of above-mentioned further scheme to be: the temperature on xeothermic rock or high-gradient ground temperature stratum is higher, general temperature is at 150 degrees Celsius to 500 degrees Celsius, and standing stock on the earth are very abundant.
Further, the boiling point of described first liquid medium is higher than the boiling point of second liquid medium.
The useful effect of above-mentioned further scheme is adopted to be: to be conducive to fast second liquid medium being heated to boiling temperature, even second liquid medium is heated into saturation steam.
Further, described drain pipe and liquid-inlet pipe are equipped with high-pressure pump.
The useful effect of above-mentioned further scheme is adopted to be: the circulation being conducive to accelerating whole system medium.
Further, one end that described liquid-inlet pipe stretches into first liquid medium is positioned at the lower section of the bottom of outer tube.
The useful effect of above-mentioned further scheme is adopted to be: the first liquid medium making temperature lower is directly adjacent to the region of geothermal source rock stratum, is convenient to heat fast.
Further, one end that described drain pipe is connected with the inner tip of outer tube is positioned at the top of heat-exchanger rig, avoids the acting affecting generating heat-exchanger rig.
The useful effect of above-mentioned further scheme is adopted to be: the steam that first liquid medium produces after heating, owing to density is higher, can spread to the top of outer tube, the outlet end of drain pipe is set above heat-exchanger rig, can under the prerequisite ensureing generating thermal heat exchange acting, the heating system extremely outside by first liquid medium transport.
Further, the part of the corresponding endotherm section of the tube wall of described liquid-inlet pipe is provided with multiple fluid hole.
Preferably, described liquid-inlet pipe is positioned at outer tube bottom or the fine and close uncased wellbore part of geothermal source rock stratum height, is provided with multiple fluid hole on tube wall.
The useful effect of above-mentioned further scheme is adopted to be: by the setting of multiple fluid hole, to be convenient to the liquid medium of the inside of liquid-inlet pipe, quickly diffuse to outer tube, be conducive to improving further heat exchanger effectiveness.
Further, the holding-zone of described outer tube also comprises the thermal insulation layer being wrapped in outside pipe.
Such as, for the material of thermal insulation layer, it is possible to the lagging material that prioritizing selection thermal conductivity is lower: foam materials such as urethane etc.
The useful effect of above-mentioned further scheme is adopted to be: by the setting of thermal insulation layer, it is possible to reduce the loss of heat, it is to increase the extraction efficiency of underground heat.
Further, the holding-zone of described outer tube also comprises interior pipe, and interior pipe box is located at outer tube, and the top of interior pipe and bottom by memory metal wear ring and outer tube wall sealing, form airtight vacuum chamber respectively between described inner and outer tubes.
Adopt the useful effect of above-mentioned further scheme to be: outer tube and interior pipe are set in pit shaft, form the insulation of double-layer vacuum outer lumen, the degree of depth that outer tube is placed, it is possible to according to the featured configuration of borehole wall peripheral part rock. First liquid medium in pit shaft, after the heat of geothermal source rock stratum, partially liq medium undergoes phase transition, and becomes steam molecule, produce high-temperature steam air-flow, to the top rapid increase of pit shaft, owing to steam molecule is in disorderly thermal motion state, and the liquid level of the tube wall of outer tube and first liquid medium collides, part steam molecule returns to in first liquid medium, along with evaporation continue carry out, the steam molecule density in outer tube constantly increases, and finally reach capacity state. Pressure increase in outer tube, rise in temperature. And due to the Surgery therapy of outer tube or the setting of vacuum chamber insulation so that heat insulation effect is fine, and thermosteresis is almost nil. After saturation steam reaches steady state, in pit shaft, the top of first liquid medium and the temperature of bottom are substantially close, second liquid medium in further heat exchanging device heats, second liquid medium seethe with excitement after for generating electricity, heat supply etc. all for needing the occasion of thermal source.
Further, the material of described wear ring is memorial alloy.
The useful effect of above-mentioned further scheme is adopted to be: during use, it is only necessary to wear ring is placed in top and the bottom of interior pipe respectively, memorial alloy produces to expand after being heated, and forms sealing, has advantages such as using simple, good sealing effect.
The present invention also provides a kind of method of extraction and application Geothermal energy, comprises the following steps:
1) by ground to the drilling well of geothermal source rock stratum, forming pit shaft, geothermal source rock stratum is goed deep in the bottom of pit shaft;
2) being placed in pit shaft by outer tube, the top of described outer tube is heat exchanging segment, and the middle part of outer tube is holding-zone, and the bottom of outer tube is endotherm section, and endotherm section is positioned at geothermal source rock stratum; The top seal of outer tube, the bottom opening of outer tube; Cementing concrete ring is utilized to fix between outer tube and pit shaft;
3) in outer tube, first liquid medium is added;
4) installing heat-exchanger rig at the heat exchanging segment place of outer tube, heat-exchanger rig is built with second liquid medium;
5) entrance of the outlet of heat-exchanger rig with generating set and/or heating plant is connected;
6) liquid-inlet pipe and drain pipe are installed: at outer tube rational position setting liquid outlet, liquid outlet is connected with the inner tip of outer tube, one end of described drain pipe is connected with the fluid inlet of outside heating system, and the other end of described drain pipe is connected with the liquid outlet of outer tube; One end of described liquid-inlet pipe stretches to below outer tube bottom or bottom through the top of outer tube and is connected with first liquid medium, and the other end of described liquid-inlet pipe is connected with the liquid outlet of the heating system of outside.
The useful effect of above-mentioned further scheme is adopted to be: the method for extraction and application Geothermal energy of the present invention is simple to operate, it is only necessary to a pit shaft just can complete said process, and floor space is little; Adopting the open hole section heat absorption of outer tube endotherm section or high tight stratum, directly make first liquid medium accept underground heat, it is not necessary to other conduction material transferring heat energy, under this environment, first liquid medium heated surface area is big. Therefore, the device of extraction and application Geothermal energy of the present invention, has that structure is simple, cost is low, heat production advantages of higher. No matter it is generating or heat supply, all without the need to output and the injection of underground water, really achieves pollution-free and zero release.
Accompanying drawing explanation
Fig. 1 is the longitudinal diagram (having vacuum chamber) of the device of extraction and application Geothermal energy of the present invention;
Fig. 2 is the sectional view (have vacuum chamber) of device at A-A place of extraction and application Geothermal energy of the present invention;
Fig. 3 is the longitudinal diagram (having thermal insulation layer) of the device of extraction and application Geothermal energy of the present invention;
Fig. 4 is the sectional view (have thermal insulation layer) of device at A-A place of extraction and application Geothermal energy of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows:
1, thermometer, 2, outer tube, 3, generating set, 4, cementing concrete ring, 5, interior pipe, 6, wear ring, 7, pit shaft, 8, heating system, 9, heat-exchanger rig, 10, thermal insulation layer, 11, liquid-inlet pipe, 12, drain pipe, 13, ground surface, 14, general stratum, 15, geothermal source rock stratum, 16, vacuum chamber.
Embodiment
The principle of the present invention and feature being described below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit the scope of the present invention.
As Figure 1-4, the device of a kind of extraction and application Geothermal energy, comprising: pit shaft 7, outer tube 2, liquid-inlet pipe 11, drain pipe 12 and heat-exchanger rig 9; The equal opening in the top of pit shaft 7 and bottom, and geothermal source rock stratum 15 is goed deep in the bottom of pit shaft 7, in described pit shaft 7 and outer tube 2 built with first liquid medium;
The top seal of outer tube 2, bottom opening; Described outer tube 2 is sheathed in pit shaft 7, described outer tube 2 is fixed by cementing concrete ring 4 and pit shaft 7, the top of described outer tube 2 is heat exchanging segment, the middle part of described outer tube 2 is holding-zone, the bottom of described outer tube 2 is endotherm section, and described endotherm section is positioned at geothermal source rock stratum 15, for absorbing the heat of geothermal source rock stratum 15, if geothermal source rock stratum 15 is high fine and close thermal source layer, endotherm section also comprises the pit shaft of high fine and close thermal source layer correspondence; Being provided with heat-exchanger rig 9 with the outside of the heat exchanging segment correspondence position of outer tube 2, described heat-exchanger rig 9 is built with second liquid medium.
The present invention there is no the restriction of concrete parameter for the top of outer tube, middle part and bottom, when specifically using, it is possible to specifically arrange the length distance of top, middle part and bottom according to the situation of reality.
One end of described drain pipe 12 is connected with the inside of outer tube 2, and the other end of described drain pipe 12 is connected with the fluid inlet of the heating system with outside;
The lower end of described liquid-inlet pipe 11 stretches to below outer tube 2 bottom or bottom and is connected with first liquid medium from the top of outer tube 2, and the upper end of described liquid-inlet pipe 11 is connected with the liquid outlet of outside heating system.
The bottom of described holding-zone is positioned at the lower section at the top of geothermal source rock stratum 15, and the top of described holding-zone is positioned at the lower section of heat-exchanger rig 9.
Second liquid medium in described heat-exchanger rig 9 by after ebuillition of heated for generating set 3/ or heating plant.
The top of described outer tube 2 is provided with thermometer 1; Described geothermal source rock stratum 15 is xeothermic rock stratum or high-gradient ground temperature stratum; The boiling point of described first liquid medium is higher than the boiling point of second liquid medium.
One end that the liquid outlet of described liquid-inlet pipe 11 stretches into first liquid medium is positioned at the lower section of the bottom of outer tube 2; One end that described drain pipe 12 is connected with the inside of outer tube 2 is positioned at the top of heat-exchanger rig 9.
The part of the corresponding endotherm section of the tube wall of described liquid-inlet pipe is provided with multiple fluid hole.
Liquid-inlet pipe 11 and drain pipe 12 are equipped with high-pressure pump, for the circulation of accelerating medium.
Two kinds of set-up modes are had for holding-zone.
A kind of mode is that the holding-zone of described outer tube 2 also comprises the thermal insulation layer 10 being wrapped in outer tube 2 outside.
Another kind of mode is, the holding-zone of described outer tube 2 also comprises interior pipe 5, and it is inner that interior pipe 5 is sheathed on outer tube 2, and the top of interior pipe 5 and bottom are sealed by wear ring 6 and outer tube 2 respectively, form airtight vacuum chamber 16 between described interior pipe 5 and outer tube 2. The material of described wear ring 6 is memorial alloy.
Utilize the method for said apparatus extraction and application Geothermal energy, comprise the following steps:
1) by ground to geothermal source rock stratum 15 drilling well, forming pit shaft 7, geothermal source rock stratum 15 is goed deep in the bottom of pit shaft 7;
2) being placed in pit shaft 7 by outer tube 2, the top of described outer tube 2 is heat exchanging segment, and the middle part of outer tube 2 is holding-zone, and the bottom of outer tube 2 is endotherm section, and endotherm section is positioned at geothermal source rock stratum 15;
The rock stratum character of thermal source rock stratum, base area 15 determines the position of outer tube 2 at pit shaft, and when geothermal source rock stratum 15 is general geothermal source rock stratum (referring to the situation except dense formation), the bottom of outer tube 2 is arranged near the bottom of pit shaft 7; When geothermal source rock stratum 15 is high dense formation, such as, during grouan, a segment distance is left in the bottom of outer tube 2 and the bottom of pit shaft 7, and now, endotherm section also comprises the pit shaft part of geothermal source rock stratum 15 correspondence;
The top seal of outer tube 2, the bottom opening of outer tube 2 is also positioned at geothermal source rock stratum 15; Cementing concrete ring 4 is utilized to fix between outer tube 2 and pit shaft 7;
3) in the outer tube 2 in pit shaft, add first liquid medium, the consumption of first liquid medium, determine according to the zone thickness of endotherm section and temperature; Concrete defining method can with reference to the conventionally calculation method of this area;
4) installing heat-exchanger rig 9 at the heat exchanging segment place of outer tube 2, heat-exchanger rig 9 is built with second liquid medium;
5) outlet of heat-exchanger rig 9 is connected with the entrance of generating set 3/ or heating plant;
6) liquid-inlet pipe 11 and drain pipe 12 are installed: one end of described drain pipe 12 is connected with the inner tip of outer tube 2, and one end of described drain pipe 12 is connected with the fluid inlet of the heating system with outside; One end of described liquid-inlet pipe 11 stretches to outer tube 2 bottom through the top of outer tube 2 and is connected with first liquid medium, and the other end of described liquid-inlet pipe 11 is connected with the liquid outlet of the heating system of outside.
The present invention does not have particular restriction for cementing concrete ring, as long as can be fixed in pit shaft by outer tube, when specifically implementing, it is possible to adopt the cementing concrete ring of reinforcing oil well cement material.
The present invention without particular restriction, generally, comprises geological logging, the confirmation of rock stratum character, geophysical well logging, underground construction operation, outer tube, interior pipe installation etc. for drilling technique. Suitable drilling technique can be selected according to concrete practical situation.
The present invention for generating set without particular restriction, it is possible to be turbine LP rotors, screw expander generating set.
The present invention for heating, for hot water facility without special restriction, the mode of connection of pipeline can be selected according to concrete situation, one or more corresponding heating is set, for hot water facility, take parallel connection, series connection and other mode of connection, various function unit, detection part are set at pipeline, such as: valve, under meter etc.
The device and method of extraction and application Geothermal energy of the present invention is not limited only to the purposes such as above-mentioned heating, heat supply, generating, is applicable to the occasion that all are relevant to heat.
High pressure high temperature resistant, resistance to and corrosion-resistant material can be selected as the material of outer tube, such as J55 special steel.
Fig. 1 of the present invention-4, for illustration of the structure of technical solution of the present invention, does not represent actual proportionlity and concrete parameter, the specification of device of the present invention, parameter, it is possible to carry out appropriate selection according to practical situation.
Below by two embodiments, the technical scheme of the present invention is described in detail.
Embodiment 1
As depicted in figs. 1 and 2, the device of a kind of extraction and application Geothermal energy, comprising: pit shaft 7, outer tube 2, liquid-inlet pipe 11, drain pipe 12 and heat-exchanger rig 9; The equal opening in the top of pit shaft 7 and bottom, and geothermal source rock stratum 15 is goed deep in the bottom of pit shaft 7, and described pit shaft 7 and outer tube 2 are built with first liquid medium;
The top seal of outer tube 2, bottom opening, the top of described outer tube 2 is provided with thermometer 1, for the convenient temperature observing outer tube 2 inside; Described outer tube 2 is sheathed in pit shaft 7, described outer tube 2 is fixed by cementing concrete ring 4 with pit shaft 7, the material of described cementing concrete ring 4 is reinforcing oil well cement, the top of described outer tube 2 is heat exchanging segment, and the middle part of described outer tube 2 is holding-zone, and the bottom of described outer tube 2 is endotherm section, if geothermal source rock stratum 15 is high fine and close thermal source layer, endotherm section also comprises the pit shaft of high fine and close thermal source layer correspondence, if geothermal source rock stratum 15 is not high densification thermal source layer, endotherm section is the bottom of outer tube 2; Being provided with heat-exchanger rig 9 with the corresponding position of outer tube 2 heat exchanging segment, described heat-exchanger rig 9 is built with second liquid medium. Second liquid medium in described heat-exchanger rig 9, by after ebuillition of heated for generating set 3/ or heating plant. The boiling point of second liquid medium is lower than the boiling point of first liquid medium, and such as first liquid medium is water, and second liquid medium is freonll-11 etc.
When heat-exchanger rig 9 is connected with generating set 3 or heating plant, it is possible to adopt suitable pipeline to connect, it is possible to further on pipeline, the function uniies such as valve is set, is easy to open or closes.
Heat-exchanger rig 9, can also be connected with generating set 3 or heating plant by pipeline, and form the pipeline of circulation, the hot water that heat-exchanger rig 9 produces or steam, for generating set or heating plant, generating set or heating plant, the medium that the temperature of generation is relatively low, then send in heat-exchanger rig 9.
The bottom of described holding-zone is positioned at the lower section at the top of thermal source rock stratum, and the top of described holding-zone is positioned at the lower section of heat-exchanger rig 9, is reduced the loss of heat as much as possible by such setting. The holding-zone of described outer tube 2 also comprises interior pipe 5, and it is inner that interior pipe 5 is sheathed on outer tube 2, and the top of interior pipe 5 and bottom are sealed with outer tube 2 by the wear ring 6 of memorial alloy material respectively, between described interior pipe 5 and outer tube 2, form airtight vacuum chamber 16. Contriver finds under study for action unexpectedly, big about 10 centimetres when the diameter of the diameter ratio outer tube of pit shaft, and in the diameter ratio of outer tube when big 1-5 centimetre of the diameter of pipe, the effect of holding-zone insulation is good especially.
One end of described drain pipe 12 is connected with the inside of outer tube 2, and this end is positioned at the top of heat-exchanger rig 9, near the top place of outer tube 2, and is provided with filtering net for impurity screening in the junction of drain pipe 12 with outer tube 2; The other end of described drain pipe 12 is connected with the fluid inlet of outside heating system 8.
Liquid-inlet pipe 11 and drain pipe 12 are equipped with high-pressure pump, for the circulation of accelerating medium.
The lower end of described liquid-inlet pipe 11 from the top of outer tube 2 pass and stretch in pit shaft first liquid medium, below the bottom that this end is positioned at outer tube 2 or bottom; The other end of described liquid-inlet pipe 11 is connected with the liquid outlet of outside heating system 8. The position that the tube wall of described liquid-inlet pipe 11 is corresponding with endotherm section is provided with multiple fluid hole.Fluid hole is circular, and multiple fluid hole is uniformly distributed on tube wall, and contriver finds under study for action unexpectedly, and when aperture is 1cm, when the adjacent distance between hole is 2-10cm, water outlet effect is good especially, and the effect of thermal exchange is also good especially.
Utilize the method for said apparatus extraction and application Geothermal energy, comprise the following steps:
1) by ground surface 12 to geothermal source rock stratum 15 drilling well, form pit shaft 7, the stratum that pit shaft 7 is corresponding from top to bottom is respectively ground surface 13, general stratum 14, geothermal source rock stratum 15 (such as: xeothermic rock stratum or high-gradient ground temperature stratum), geothermal source rock stratum 15 is goed deep in the bottom of pit shaft 7, and the bottom of pit shaft 7 is connected with geothermal source rock stratum 15.
2) outer tube 2 is placed in pit shaft 7, geothermal source rock stratum 15 is stretched in the bottom of outer tube 2, the rock stratum character of thermal source rock stratum, base area 15, determine the degree of depth of the bottom of outer tube 2 in pit shaft 7, if (referring to the situation except high dense formation) when geothermal source rock stratum 15 is general thermal source rock stratum, the bottom of outer tube 2 near the bottommost of pit shaft 7, now, endotherm section is the bottom of outer tube 2, and namely outer tube 2 is followed successively by radiating segment, holding-zone, endotherm section from top to bottom; Such as, when geothermal source rock stratum 15 is high dense formation, grouan, and when the borehole wall is fairly regular, now, endotherm section also comprises the pit shaft part being positioned at geothermal source rock stratum 15, and a segment distance is left in the bottom of outer tube 2 and the bottom of pit shaft 7, and the degree of the more big energy efficiency of distance is more high. The size of this distance, depends on the thickness on high fine and close thermal source stratum, it is possible to contour with height fine and close heat source layer thickness.
3) first liquid medium is added to the outer tube 2 in pit shaft 7.
4) seal between outer tube 2 and pit shaft 7 with cementing concrete ring, outer tube 2 and pit shaft 7 are fixed.
5) being placed in outer tube 2 by interior pipe 5, interior pipe 5 bottom is positioned at below the top of endotherm section, between interior pipe 5 and the sidewall of outer tube 2, forms airtight vacuum chamber 16; The top of interior pipe 5 and bottom are sealed by the tube wall of the memorial alloy wear ring 6 of ring-type with outer tube 2 respectively. The bottom of interior pipe 5 is positioned under top, geothermal source rock stratum 15, or the bottom of interior pipe 5 and top, geothermal source rock stratum 15 are put down together.
6) by the top seal of outer tube 2, installing heat-exchanger rig 9 at the heat exchanging segment place of outer tube 2, heat-exchanger rig 9 is built with second liquid medium, and the heat-transfer surface of heat-exchanger rig 9 is corresponding with the heat exchanging segment of outer tube 2;
7) outlet of heat-exchanger rig 9 is connected with the entrance of generating set 3/ or heating plant.
8) installing liquid-inlet pipe 11 and drain pipe 12: one end of described drain pipe 12 is connected with the inner tip of outer tube 2, the other end of described drain pipe 12 is connected with the fluid inlet of outside heating system 8; One end of described liquid-inlet pipe 11 stretches to pit shaft bottom through the top of outer tube 2 and is connected with first liquid medium, and the other end of described liquid-inlet pipe 11 is connected with the liquid outlet of the heating system 8 of outside.
Principle of work: the first liquid medium in pit shaft, after the heat through geothermal source rock stratum 15 is seethed with excitement, partially liq undergoes phase transition, and becomes steam molecule, produces high-temperature steam air-flow. This air-flow is to the top rapid increase of pit shaft, owing to steam molecule is in disorderly thermal motion state, collide with the liquid level of the tube wall of outer tube and first liquid medium, part steam molecule returns to in first liquid medium, along with evaporation continue carry out, steam molecule density in sleeve pipe constantly increases, and finally reach capacity state.The top seal of sleeve pipe, makes the pressure increase in sleeve pipe, rise in temperature. And the setting due to holding-zone so that the thermosteresis of steam molecule in transmittance process is almost nil. After saturation steam reaches steady state, the top of the first liquid medium in pit shaft and the temperature of bottom are substantially close, when heat is passed to radiating segment, second liquid medium in further heat exchanging device heats, second liquid medium seethe with excitement after for generating electricity, heat supply etc. all for needing the place of thermal source. Meanwhile, the steam molecule after heating, is used in outside heating system through drain pipe; The water that the temperature that heating system produces is lower, enters into the bottom in outer tube through liquid-inlet pipe, utilizes high-pressure pump to carry out circulation heating.
Embodiment 2
As shown in Figure 3 and Figure 4, the device of a kind of extraction and application Geothermal energy, comprising: pit shaft 7, outer tube 2, liquid-inlet pipe 11, drain pipe 12 and heat-exchanger rig 9; The equal opening in the top of pit shaft 7 and bottom, and geothermal source rock stratum 15 is goed deep in the bottom of pit shaft 7, and the outer tube 2 in described pit shaft 7 is equipped with first liquid medium;
The top seal of outer tube 2, bottom opening, the top of described outer tube 2 is provided with thermometer 1, for the convenient temperature observing outer tube 2 inside, described outer tube 2 is sheathed in pit shaft 7, described outer tube 2 is fixed by cementing concrete ring 4 with pit shaft 7, the material of described cementing concrete ring 4 is reinforcing oil well cement, the top of described outer tube 2 is heat exchanging segment, the middle part of described outer tube 2 is holding-zone, the bottom of described outer tube 2 is endotherm section, endotherm section is positioned at geothermal source rock stratum 15, if geothermal source rock stratum 15 is high fine and close thermal source layer, endotherm section also comprises the pit shaft of high fine and close thermal source layer correspondence, if geothermal source rock stratum 15 is not high densification thermal source layer, endotherm section is the bottom of outer tube 2, namely outer tube is followed successively by radiating segment from top to bottom, holding-zone and endotherm section, being provided with heat-exchanger rig 9 with the correspondence position of the heat exchanging segment of outer tube 2, described heat-exchanger rig 9 is built with second liquid medium. second liquid medium in described heat-exchanger rig 9, by after ebuillition of heated for generating set 3/ or heating plant. the boiling point of second liquid medium is lower than the boiling point of first liquid medium, and such as first liquid medium is water, and second liquid medium is freonll-11 etc.
For heat-exchanger rig 9, when being connected with generating set 3 or heating plant, it is possible to adopt suitable pipeline to connect, it is possible to further arranges the function uniies such as valve on pipeline, is easy to open or closes.
Heat-exchanger rig 9, can also be connected with generating set 3 or heating plant by pipeline and form the pipeline of circulation, the hot water that heat-exchanger rig 9 produces or steam, for generating set or heating plant, generating set or heating plant, the medium that the temperature of generation is relatively low is sent in heat-exchanger rig 9 again.
Described endotherm section is positioned at the whole of the geothermal source rock stratum 15 of pit shaft, and the bottom of holding-zone is positioned at the lower section at the top of geothermal source rock stratum 15, and the top of described holding-zone is positioned at the lower section of heat-exchanger rig 9. The holding-zone of described outer tube 2 also comprises the thermal insulation layer 10 being wrapped in outer tube 2 outside, and the material of thermal insulation layer 10 is the foam materials such as urethane.
One end of described drain pipe 12 is connected with the inner tip of outer tube 2, and this end is positioned at the top of heat-exchanger rig 9, near the top place of outer tube 2, and is provided with filtering net for impurity screening in the junction of drain pipe 12 with outer tube 2; The other end of described drain pipe 12 is connected with the fluid inlet of outside heating system 8.
One end of described liquid-inlet pipe 11 stretches to below the bottom of outer tube or bottom and is connected with first liquid medium through the top of outer tube 2, and this end is positioned at the bottom of outer tube 2 until shaft bottom; The other end of described liquid-inlet pipe 11 is connected with the liquid outlet of outside heating system 8. The part of the corresponding endotherm section of the tube wall of described liquid-inlet pipe 11 is provided with multiple fluid hole. Fluid hole is circular, and multiple fluid hole is uniformly distributed on tube wall, and contriver finds under study for action unexpectedly, and when aperture is 1cm, when the adjacent distance between hole is 2-10cm, water outlet effect is good especially, and the effect of thermal exchange is also good especially.
Liquid-inlet pipe 11 and drain pipe 12 all can be provided with high-pressure pump, for the circulation of accelerating medium.
Utilize the method for said apparatus extraction and application Geothermal energy, comprise the following steps:
1) by ground surface 12 to geothermal source rock stratum 15 (xeothermic rock stratum or high underground temperature gradient stratum) drilling well, form pit shaft 7, the stratum that pit shaft 7 is corresponding from top to bottom is respectively ground surface 13, general stratum 14 and geothermal source rock stratum 15, geothermal source rock stratum 15 is goed deep in the bottom of pit shaft 7, and the inside of pit shaft 7 is connected with geothermal source rock stratum 15.
2) outer tube 2 is placed in pit shaft 7, outer wall in the middle part of outer tube 2 wraps up one layer of heat preservation layer 10 in advance, geothermal source rock stratum 15 is stretched in the bottom of outer tube 2, the rock stratum character of thermal source rock stratum, base area 15, determining the degree of depth in pit shaft 7 bottom outer tube 2, when geothermal source rock stratum 15 is general stratum (referring to the situation except high dense formation), the bottom of outer tube 2 is near the bottom of pit shaft 7, now, outer tube 2 is followed successively by radiating segment, holding-zone and endotherm section from top to bottom; When geothermal source rock stratum 15 is high dense formation, such as during grouan, now, endotherm section also comprises the part that geothermal source rock stratum 15 correspond to pit shaft, a segment distance can be left in the bottom of outer tube 2 and the bottom of pit shaft 7, and the length of this distance can equal the thickness of high dense formation.
3) seal between outer tube 2 and pit shaft 7 with cementing concrete, outer tube 2 and pit shaft 7 are fixed.
4) in the outer tube 2 in pit shaft 7, first liquid medium is added.
5) by the top seal of outer tube 2, installing heat-exchanger rig 9 in the outside of the heat exchanging segment of outer tube 2, heat-exchanger rig 9 is built with second liquid medium, and the heat-transfer surface of heat-exchanger rig 9 is corresponding with the heat exchanging segment of outer tube 2;
6) outlet of heat-exchanger rig 9 is connected with the entrance of generating set 3/ or heating plant.
7) installing liquid-inlet pipe 11 and drain pipe 12: one end of described drain pipe 12 is connected with the inner tip of outer tube 2, the other end of described drain pipe 12 is connected with the fluid inlet of outside heating system 8; Below outer tube 2 bottom or bottom are stretched into until in first liquid medium, the other end of described liquid-inlet pipe 11 is connected with the liquid outlet of outside heating system 8 through the top of outer tube 2 in one end of described liquid-inlet pipe 11.
Principle of work: the first liquid medium in pit shaft, seethe with excitement after the heat of geothermal source rock stratum 15, partially liq undergoes phase transition, become steam molecule, produce high-temperature steam air-flow, to the top rapid increase of pit shaft, owing to steam molecule is in the state of disorderly thermal motion, collide with the liquid level of the tube wall of outer tube and first liquid medium, part steam molecule returns to in first liquid medium, along with evaporation continue carry out, the steam molecule density in sleeve pipe constantly increases, and finally reach capacity state. The top seal of sleeve pipe, makes the pressure increase in sleeve pipe, rise in temperature. And the setting due to holding-zone, make steam molecule in transmittance process, thermosteresis is almost nil, and finally reach capacity steam condition. After saturation steam reaches steady state, in pit shaft, the top of first liquid medium and the temperature of bottom are substantially close, when heat is passed to heat exchanging segment, second liquid medium in further heat exchanging device heats, after second liquid medium seethes with excitement, for generating electricity, heat supply etc. all for needing the occasion of thermal source. Meanwhile, liquid medium after heating, it is possible to be directly used in outside heating system through drain pipe; Heating system produces the lower water of temperature, enters in outer tube through liquid-inlet pipe, carries out circulation heating by high-pressure pump.
The foregoing is only the better embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the device of an extraction and application Geothermal energy, it is characterised in that, comprising: pit shaft (7), outer tube (2), liquid-inlet pipe (11), drain pipe (12) and heat-exchanger rig (9); The equal opening in top and bottom of pit shaft (7) and geothermal source rock stratum (15) is goed deep in the bottom of pit shaft (7), in described pit shaft (7) and outer tube (2) built with first liquid medium;
The top seal of outer tube (2), bottom opening; Described outer tube (2) is sheathed in pit shaft (7), described outer tube (2) is fixed by cementing concrete ring (4) and pit shaft (7), the top of described outer tube (2) is heat exchanging segment, the middle part of described outer tube (2) is holding-zone, the bottom of described outer tube (2) is endotherm section, and described endotherm section is positioned at geothermal source rock stratum (15); Being provided with heat-exchanger rig (9) with the outside of the correspondence position of outer tube (2) heat exchanging segment, described heat-exchanger rig (9) is built with second liquid medium;
One end of described drain pipe (12) is connected with the inside of outer tube (2), and the other end of described drain pipe (12) is connected with the fluid inlet of the heating system with outside;
The lower end of described liquid-inlet pipe (11) stretches to below outer tube (2) bottom or bottom and is connected with first liquid medium from the top of outer tube (2), and the upper end of described liquid-inlet pipe (11) is connected with the liquid outlet of outside heating system.
2. the device of a kind of extraction and application Geothermal energy according to claim 1, it is characterised in that, described endotherm section also comprises pit shaft corresponding to thermal source layer position fine and close in height.
3. the device of a kind of extraction and application Geothermal energy according to claim 1, it is characterised in that, the bottom of described holding-zone is positioned at geothermal source rock stratum (15), and the top of described holding-zone is positioned at the lower section of heat-exchanger rig (9).
4. the device of a kind of extraction and application Geothermal energy according to claim 1, it is characterised in that, the second liquid medium in described heat-exchanger rig (9) by after ebuillition of heated for generating set (3) and/or heating plant; The top of described outer tube (2) is provided with thermometer (1); Described geothermal source rock stratum (15) is xeothermic rock stratum or high underground temperature gradient stratum; The boiling point of described first liquid medium is higher than the boiling point of second liquid medium; Described drain pipe (12) and liquid-inlet pipe (11) are equipped with high-pressure pump.
5. the device of a kind of extraction and application Geothermal energy according to claim 1, it is characterised in that, one end that described drain pipe (12) is connected with the inside of outer tube (2) is positioned at the top of heat-exchanger rig (9).
6. the device of a kind of extraction and application Geothermal energy according to claim 1, it is characterised in that, the part of the corresponding endotherm section of the tube wall of described liquid-inlet pipe (11) is provided with multiple fluid hole.
7. according to the device of the described a kind of extraction and application Geothermal energy of the arbitrary item of claim 1-6, it is characterised in that, the holding-zone of described outer tube (2) also comprises the thermal insulation layer (10) being wrapped in outer tube (2) outside.
8. according to the device of the described a kind of extraction and application Geothermal energy of the arbitrary item of claim 1-6, it is characterized in that, the holding-zone of described outer tube (2) also comprises interior pipe (5), it is inner that interior pipe (5) is sheathed on outer tube (2), the top of interior pipe (5) and bottom by the inner wall sealing of wear ring (6) with outer tube (2), form airtight vacuum chamber (16) respectively between described interior pipe (5) and outer tube (2).
9. the device of a kind of extraction and application Geothermal energy according to claim 8, it is characterised in that, the material of described wear ring (6) is memorial alloy.
10. the method for an extraction and application Geothermal energy, it is characterised in that, comprise the following steps:
1) by ground to geothermal source rock stratum (15) drilling well, forming pit shaft (7), geothermal source rock stratum (15) is goed deep in the bottom of pit shaft (7);
2) outer tube (2) is placed in pit shaft (7), the top of described outer tube (2) is heat exchanging segment, the middle part of outer tube (2) is holding-zone, the bottom of outer tube (2) is for being endotherm section, and endotherm section is positioned at geothermal source rock stratum (15); By the top seal of outer tube (2), the bottom opening of outer tube (2); Cementing concrete ring (4) is utilized to fix between outer tube (2) and pit shaft (7);
3) in outer tube (2), first liquid medium is added;
4) installing heat-exchanger rig (9) at the heat exchanging segment place of outer tube (2), heat-exchanger rig (9) is built with second liquid medium;
5) outlet of heat-exchanger rig (9) is connected with the entrance of generating set (3) and/or heating plant;
6) liquid-inlet pipe (11) and drain pipe (12) are installed: at outer tube (2) reasonably position setting liquid outlet, one end of described drain pipe (12) is connected with the fluid inlet of the heating system with outside, and the other end of described drain pipe (12) is connected with the liquid outlet of outer tube (2); One end of described liquid-inlet pipe (11) stretches to below outer tube (2) bottom or bottom through the top of outer tube (2) and is connected with first liquid medium, and the other end of described liquid-inlet pipe (11) is connected with the liquid outlet of the heating system of outside.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105958870A (en) * | 2016-06-29 | 2016-09-21 | 中国石油大学(华东) | Composite cold-source hot dry rock thermoelectric power generation system and method |
| CN106130406A (en) * | 2016-06-29 | 2016-11-16 | 中国石油大学(华东) | Stratum self low-temperature receiver type hot dry rock thermoelectric heat generation system and method |
| CN106996658A (en) * | 2017-05-02 | 2017-08-01 | 中能服能源科技股份有限公司 | A kind of ultradeep well hot dry rock steam turbine formula heat pump waste heat recovery heating system |
| CN108050717A (en) * | 2017-12-11 | 2018-05-18 | 王盛昌 | Heat pipe-type hot dry rock high-efficiency heat exchanger |
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| CN106996658A (en) * | 2017-05-02 | 2017-08-01 | 中能服能源科技股份有限公司 | A kind of ultradeep well hot dry rock steam turbine formula heat pump waste heat recovery heating system |
| CN108302833A (en) * | 2017-08-31 | 2018-07-20 | 环和地能创新科技有限公司 | Closed deep geothermal heat energy acquisition system and method |
| CN108050717A (en) * | 2017-12-11 | 2018-05-18 | 王盛昌 | Heat pipe-type hot dry rock high-efficiency heat exchanger |
| CN108756821A (en) * | 2018-05-28 | 2018-11-06 | 中国石油大学(华东) | Oil well thermoelectric heat generation system and method |
| CN108775275A (en) * | 2018-05-28 | 2018-11-09 | 中国石油大学(华东) | Individual well closed cycle underground thermoelectric heat generation system and method |
| CN108799024A (en) * | 2018-05-28 | 2018-11-13 | 中国石油大学(华东) | U-tube heat exchange closed cycle underground thermoelectric heat generation system and method |
| CN109282515A (en) * | 2018-08-24 | 2019-01-29 | 河南环发工程有限公司 | A kind of heat accumulating type underground heat extraction element and extracting method |
| CN109813001A (en) * | 2019-01-21 | 2019-05-28 | 东营市浩瀚生化科技有限公司 | A kind of hands-free method and geothermal energy extraction element using low temperature geothermal fluid |
| CN109813001B (en) * | 2019-01-21 | 2020-12-15 | 东营市浩瀚生化科技有限公司 | Method for using low-temperature geothermal fluid in lift-free mode and geothermal energy extraction device |
| CN112781422A (en) * | 2021-02-02 | 2021-05-11 | 西南石油大学 | Method for realizing combination of shaft cooling and heat energy utilization by using drilling fluid |
| CN114508775A (en) * | 2022-02-22 | 2022-05-17 | 河北工程大学 | Drilling heating system based on middle-deep geothermal energy |
| CN114508775B (en) * | 2022-02-22 | 2023-04-14 | 河北工程大学 | Drilling heating system based on middle-deep geothermal energy |
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Application publication date: 20160615 |