CN107860145B - Underground heat individual well free convection enhanced heat exchange system - Google Patents
Underground heat individual well free convection enhanced heat exchange system Download PDFInfo
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- CN107860145B CN107860145B CN201710955005.3A CN201710955005A CN107860145B CN 107860145 B CN107860145 B CN 107860145B CN 201710955005 A CN201710955005 A CN 201710955005A CN 107860145 B CN107860145 B CN 107860145B
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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
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Abstract
Underground heat individual well free convection enhanced heat exchange system, including metal well, insulating tube, porous system；The metal well gos deep into lithosphere, and insulating tube is equipped with inside metal well, forms intake tunnel between the insulating tube and metal well inner wall, forms exhalant canal inside insulating tube, the intake tunnel is connected to exhalant canal in metal bottom；The periphery of metal bottom is arranged in the porous system, and the porous system top is lithosphere, is equipped with interconnected irregular hole in porous system, water is full of in the irregular hole of porous system.Advantage is to increase substantially single well thermal power.Reduce project cost, save the cost.It avoids impacting underground water, protects environment.
Description
Technical field
The present invention relates to the hot equipment technical fields of single well, and in particular to a kind of underground heat individual well free convection enhanced heat exchange system
System.
Background technique
The northern area of China haze is serious, especially winter Heating Season, and haze has been further aggravated in heating fire coal, at this stage
Clean energy resource heating technology is in urgent need.Underground heat as a kind of clean reproducible energy, in northern heating increasingly by
Pay attention to.Newly occurs a kind of individual well geothermal heating system currently on the market, well depth is generally higher than 1000 meters, using coaxial sleeve knot
Structure takes heat to rock by metal outer wall, is exported heat by inside holding pipe.Since system lock recycles, underground heat is not adopted
Water does not have the problems such as recharge without corrosion and scaling, standby to be received by the market.But the individual well geothermal heating system is in use process
In encounter that single well thermal power is small, and power attenuation is fast, the problems such as the investment payback time is long limit individual well geothermal heating system
Large-scale promotion.Individual well geothermal heating system substantially without geographical restrictions, takes up little area, if it is small to can solve individual well exchange capability of heat
Problem, this kind of heating system can make huge contribution for the solution of northern China winter haze.
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned prior art, providing a kind of can effectively overcome rock thermal coefficient
It is low, improve the underground heat individual well free convection enhanced heat exchange system of single well thermal power.
The present invention is achieved through the following technical solutions:
Underground heat individual well free convection enhanced heat exchange system, including metal well, insulating tube, porous system；The metal well
Go deep into lithosphere, insulating tube is equipped with inside metal well, forms intake tunnel between the insulating tube and metal well inner wall, protects
Exhalant canal is formed inside warm pipe, the intake tunnel is connected to exhalant canal in metal bottom；The porous system
The periphery of metal bottom is set, and the porous system top is lithosphere, is equipped with and is interconnected not in porous system
Regular hole is full of water in the irregular hole of porous system.
As an improvement of the above scheme, the porous system radial thickness is 20-100m.
As an improvement of the above scheme, proppant is injected in the porous system, the proppant is metallic particles
Or ceramic particle.
As an improvement of the above scheme, the insulating tube is double layer vacuum tube.
The invention has the following advantages:
1. increasing substantially single well thermal power.
2. reducing project cost, save the cost.
3. avoiding impacting underground water, environment is protected.
Detailed description of the invention
Fig. 1 is heat-exchange system structural schematic diagram of the invention.
Specific embodiment
Embodiment 1
As shown in Figure 1, underground heat individual well free convection enhanced heat exchange system, including metal well 1, insulating tube 2, porous system 3；
The metal well 1 gos deep into lithosphere 4, and insulating tube 2, the insulating tube 2 and 1 inner wall of metal well are equipped with inside metal well 1
Between form intake tunnel 5, exhalant canal 6 is formed inside insulating tube 2, the intake tunnel 5 and exhalant canal 6 are in metal well
The connection of 1 bottom；The periphery of 1 bottom of metal well is arranged in the porous system 3, and 3 top of porous system is lithosphere
4, it is equipped with interconnected irregular hole in porous system 3, water is full of in the irregular hole of porous system 3.Described
3 radial thickness of porous system is 20-100m.Proppant is injected in the porous system 3, the proppant is metallic particles
Or ceramic particle.The insulating tube 2 is double layer vacuum tube.
Embodiment 2
By well depth 3000m, hole diameter 244.5mm geothermal well for, 30 DEG C/km of geothermal gradient, 10 DEG C of surface temperature, shaft bottom
100 DEG C of temperature.Selection manufactures porous system 3 in lower part 1000m.Top 2000m lithosphere 4 is still thermally conductive using traditional rock
Mode takes heat, and lower part 1000m uses the free convection enhanced heat exchange of water in porous system 3.Porous system 3 is using hydraulic fracturing
Mode is formed, and can also be formed by the way of explosion, can also be formed using perforation, pressure break and the combination of explosion.It is more
After pore system 3 is formed, proppant is injected, proppant can be metallic particles, be also possible to ceramic particle.Then to porous system
3 fill water, will be isolated in porous system 3 and well by the metal borehole wall.
The radius of porous system 3 can choose 20m, 30m or bigger, depending on whether there is or not concurrent heatings.If being only used for winter
Heating, non-heating season does not have the heat loss of heat supplement underground, then the radius of porous system 3 is big, such as 50m or 100m
Or it is bigger.If non-heating season is using solar energy etc., addedly lower heat is lost, the radius of porous system 3 can with smaller, than
Such as 20m or 30m.
Insulating tube 2 injects 15 DEG C of water by intake tunnel 5 using the double layer vacuum tube of 160mm, and injection water passes through metal
The tube wall of well 1 exchanges heat with lithosphere 4 and porous system 3.Intake tunnel 5 inject water temperature it is low (injection 15 DEG C of coolant-temperature gage,
The initial temperature of water is between 70-100 DEG C in porous system 3), the water cooling in the porous system 3 of the borehole wall is caused, and it is remote
Coolant-temperature gage in porous system 3 from the borehole wall is high.In porous system 3, the temperature difference of nearly well and remote well causes the free convection of water,
Nearly well fluids move downward, and remote well fluids move upwards.The NATURAL CONVECTION COEFFICIENT OF HEAT of water is much larger than the thermal coefficient of rock, leads to
The heat of distant place rock is effectively transmitted to the borehole wall by the free convection for crossing water, is enhanced the heat exchange of the outer rock of well, is greatly improved
Underground heat individual well exchange capability of heat.Water flow velocity is injected by adjusting, 30 DEG C or so of GEOTHERMAL WATER, extraction ground can be produced from insulating tube 2
Hot water goes to heat after promoting temperature by heat pump, and the GEOTHERMAL WATER for extracting heat through heat pump becomes 15 DEG C, re-injects in well and changes
Heat.It is only thermally conductive come if taking heat with rock if not using porous system 3, the thermal coefficient of rock 2-3.5W/m/K it
Between, 3000m individual well takes heat in 300kW or so, and as the decaying of time is fast, without concurrent heating, several Heating Seasons
Afterwards, individual well takes heat much smaller than 300kW.If using individual well free convection enhanced heat exchange, due to the nature of water in porous system 3
Convection current can quickly introduce the heat of distant place rock in well, individual well adopt heat much larger than only by rock it is thermally conductive adopt heat,
And decaying is slow.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and the embodiment is not to limit this hair
Bright the scope of the patents, all equivalence enforcements or change without departing from carried out by the present invention, is intended to be limited solely by the scope of the patents of this case.
Claims (3)
1. underground heat individual well free convection enhanced heat exchange system, which is characterized in that including metal well, insulating tube, porous system；It is described
Metal well go deep into lithosphere, inside metal well be equipped with insulating tube, formed between the insulating tube and metal well inner wall into
Aquaporin, insulating tube inside form exhalant canal, and the intake tunnel is connected to exhalant canal in metal bottom；Described
The periphery of metal bottom is arranged in porous system, and the porous system top is lithosphere, is equipped in porous system mutual
The irregular hole of connection is full of water in the irregular hole of porous system；Proppant, institute are injected in the porous system
The proppant stated is metallic particles or ceramic particle.
2. underground heat individual well free convection enhanced heat exchange system according to claim 1, which is characterized in that the porous body
Be radial thickness be 20-100m.
3. underground heat individual well free convection enhanced heat exchange system according to claim 1, which is characterized in that the insulating tube
For double layer vacuum tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710955005.3A CN107860145B (en) | 2017-10-13 | 2017-10-13 | Underground heat individual well free convection enhanced heat exchange system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710955005.3A CN107860145B (en) | 2017-10-13 | 2017-10-13 | Underground heat individual well free convection enhanced heat exchange system |
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| CN107860145A CN107860145A (en) | 2018-03-30 |
| CN107860145B true CN107860145B (en) | 2019-10-08 |
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| CN201710955005.3A Active CN107860145B (en) | 2017-10-13 | 2017-10-13 | Underground heat individual well free convection enhanced heat exchange system |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110131781A (en) * | 2019-04-29 | 2019-08-16 | 中国科学院广州能源研究所 | A kind of mid-deep strata underground heat adopts fill system with well |
| CN110131780A (en) * | 2019-04-29 | 2019-08-16 | 中国科学院广州能源研究所 | A kind of underground heat individual well is thermally conductive plus the full well section of convection current takes hot systems |
| CN110131782A (en) * | 2019-04-29 | 2019-08-16 | 中国科学院广州能源研究所 | A kind of underground heat individual well enhanced heat exchange system |
| CN110159497A (en) * | 2019-04-29 | 2019-08-23 | 中国科学院广州能源研究所 | A kind of light co-generation system of island geothermal energy electricity |
| CN110044090B (en) * | 2019-05-08 | 2023-12-22 | 中核坤华能源发展有限公司 | Efficient Shan Jingjing lower heat exchange system |
| CN111442549A (en) * | 2020-03-10 | 2020-07-24 | 甘肃省建材科研设计院有限责任公司 | Method for enhancing heat exchange |
| CN217584916U (en) * | 2022-05-12 | 2022-10-14 | 等熵循环(北京)新能源科技有限公司 | Support structure vacuum cavity combined middle-deep geothermal heat pipe |
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| US4912941A (en) * | 1987-07-22 | 1990-04-03 | Buechi Hans F | Method and apparatus for extracting and utilizing geothermal energy |
| CN101349450A (en) * | 2008-06-27 | 2009-01-21 | 赵铭 | Deep layer terrestrial heat renewable energy source winter heating method |
| CN205561615U (en) * | 2016-03-17 | 2016-09-07 | 南京英柯森新能源技术有限公司 | Ground depth of origin well energy storage exchange system land used buries heat exchange tube |
| CN205561323U (en) * | 2016-02-17 | 2016-09-07 | 姚国敏 | Draw device that utilizes geothermal energy |
| CN106403379A (en) * | 2016-08-30 | 2017-02-15 | 湖南中大经纬地热开发科技有限公司 | Geotherm utilizing method based on bed rock geology |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004271129A (en) * | 2003-03-11 | 2004-09-30 | Tone Boring Co Ltd | Underground heat exchange system |
| US20110232858A1 (en) * | 2010-03-25 | 2011-09-29 | Hiroaki Hara | Geothermal well using graphite as solid conductor |
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2017
- 2017-10-13 CN CN201710955005.3A patent/CN107860145B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4912941A (en) * | 1987-07-22 | 1990-04-03 | Buechi Hans F | Method and apparatus for extracting and utilizing geothermal energy |
| CN101349450A (en) * | 2008-06-27 | 2009-01-21 | 赵铭 | Deep layer terrestrial heat renewable energy source winter heating method |
| CN205561323U (en) * | 2016-02-17 | 2016-09-07 | 姚国敏 | Draw device that utilizes geothermal energy |
| CN205561615U (en) * | 2016-03-17 | 2016-09-07 | 南京英柯森新能源技术有限公司 | Ground depth of origin well energy storage exchange system land used buries heat exchange tube |
| CN106403379A (en) * | 2016-08-30 | 2017-02-15 | 湖南中大经纬地热开发科技有限公司 | Geotherm utilizing method based on bed rock geology |
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