CN112923592A - High-efficient coaxial heat transfer device of middle-deep layer noiseless geothermal energy - Google Patents
High-efficient coaxial heat transfer device of middle-deep layer noiseless geothermal energy Download PDFInfo
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- CN112923592A CN112923592A CN202110342294.6A CN202110342294A CN112923592A CN 112923592 A CN112923592 A CN 112923592A CN 202110342294 A CN202110342294 A CN 202110342294A CN 112923592 A CN112923592 A CN 112923592A
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- heat exchange
- outer sleeve
- coaxial
- heat
- geothermal energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
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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 discloses a medium-deep layer interference-free geothermal energy efficient coaxial heat exchange device which comprises a heat exchange enhancement outer sleeve for absorbing heat from a soil temperature raising layer and a coaxial heat insulation inner pipe for conveying heat exchange medium circulating water. The heat exchange enhancement outer sleeve is integrally formed by a metal material with high heat conductivity coefficient, raised longitudinal metal fins are uniformly distributed on the outer wall and the inner wall of the heat exchange enhancement outer sleeve, and the diameter of an equivalent coaxial circle formed by the raised longitudinal metal fins on the inner wall is larger than the outer diameter of the heat insulation inner tube. The reinforced heat exchange outer sleeve of the medium-deep layer interference-free geothermal energy efficient coaxial heat exchange device is arranged in a temperature raising layer of soil, the upper part of the reinforced heat exchange outer sleeve is connected with the light pipes of the coaxial heat exchange device outer sleeves arranged in the soil temperature changing layer and the constant temperature layer, and the middle part of the reinforced heat exchange outer sleeve is a coaxial heat insulation inner pipe for conveying heat exchange medium circulating water. Compared with the prior light tube outer sleeve heat exchange device, the heat exchange between the heat absorption medium circulating water and the rock-soil layer can be strengthened, the single-well heat exchange quantity is increased, and the water outlet temperature is increased.
Description
Technical Field
The invention relates to a middle-deep layer interference-free geothermal energy efficient coaxial heat exchange device.
Background
According to different geological conditions, a soil temperature change layer and a constant temperature layer which are 0-300 m below the earth surface are shallow thermal reservoir layers, and the temperature is low (about 20 ℃); the temperature increasing layer (middle-deep rock soil) is 300-4000 m below the earth surface, is a middle-deep thermal reservoir, and the highest temperature of the rock soil at the bottom of the well can reach more than 80 ℃.
The non-interference geothermal heat supply technology for the middle-deep layer is a clean heat supply technology of green and environment-friendly renewable energy sources, which is characterized in that a well is drilled in a subsurface soil warming layer (middle-deep rock soil), a subsurface middle-deep rock soil heat reservoir or hot dry rock is used as a heat source, geothermal energy is extracted through special underground heat exchange equipment, no underground water is used, and the non-interference geothermal heat supply technology for the subsurface aquifer is realized.
The medium-deep layer non-interference geothermal heat supply technology mainly comprises single-well coaxial heat exchange and U-shaped well-to-well heat exchange, wherein the single-well coaxial heat exchange technology has great market potential in development, popularization and application in recent years.
In the existing medium-deep layer non-interference geothermal heat supply technology, the outer walls of coaxial heat exchange outer sleeves arranged on a soil constant temperature layer and a soil temperature increasing layer are designed into light tubes, the inner parts of the outer sleeves are designed into light tubes or concave grooves, and the heat absorption effect, the single-well heat exchange amount and the water outlet temperature are all required to be improved.
Disclosure of Invention
The invention aims to provide the efficient interference-free geothermal energy heat exchange device which can strengthen the heat exchange between the heat absorption medium circulating water and the rock-soil layer, increase the heat exchange quantity of a single well and improve the water outlet temperature by redesigning the structure of the interference-free geothermal energy coaxial heat exchange outer sleeve based on the explanation of the technical background of the interference-free geothermal energy coaxial heat exchange of the middle-deep layer.
In order to achieve the above purpose, the invention provides the following technical scheme:
a medium-deep layer interference-free geothermal energy efficient coaxial heat exchange device comprises an enhanced heat exchange outer sleeve for absorbing heat from a soil warming layer (medium-deep layer rock soil) and a coaxial heat insulation inner pipe for conveying heat exchange medium circulating water. The inner wall of the reinforced heat exchange outer sleeve is provided with raised longitudinal inner metal fins, and the outer wall of the reinforced heat exchange outer sleeve is also provided with raised longitudinal outer metal fins.
The diameter D1 of an equivalent coaxial circle formed by the longitudinal inner metal fins protruding on the inner wall of the heat-exchange strengthening outer sleeve is larger than the outer diameter D2 of the heat-insulation inner pipe.
The number of the longitudinal inner metal fins protruding on the inner wall of the heat exchange enhancement outer sleeve is not less than 3, and the number of the longitudinal outer metal fins protruding on the outer wall of the heat exchange enhancement outer sleeve is not less than 12.
The heat exchange strengthening outer sleeve is integrally formed by metal materials with high heat conductivity coefficient, such as aluminum alloy, carbon steel, alloy steel and the like.
The reinforced heat exchange outer sleeve is arranged in a soil temperature increasing layer (medium-deep rock soil), the upper part of the reinforced heat exchange outer sleeve is connected with an outer sleeve light pipe of a coaxial heat exchange device arranged from the ground to the soil temperature changing layer and the constant temperature layer, and the middle part of the reinforced heat exchange outer sleeve is a coaxial heat insulation inner pipe for conveying heat exchange medium circulating water.
The coaxial heat-insulating inner pipe for conveying the circulating water of the heat exchange medium is continuously lowered into the geothermal well from the light pipe of the outer sleeve and the reinforced heat exchange outer sleeve.
A wellhead water outlet end and a wellhead water inlet end of the coaxial heat exchange device are respectively connected with a geothermal energy heat exchange unit (plate heat exchange or heat pump) to form an interference-free geothermal energy closed heat absorption cycle.
The invention has the beneficial effects that: compared with the prior light pipe outer sleeve heat exchange device, the outer sleeve heat exchange enhancement device has the advantages that the raised longitudinal metal fins are uniformly distributed on the inner wall and the outer wall of the outer sleeve, so that the heat exchange area of the heat exchange enhancement outer sleeve is larger under the same pipe diameter, the heat transfer coefficient is higher, the heat exchange of heat exchange medium circulating water and a rock-soil layer can be enhanced, the heat exchange quantity of a single well is increased, the heat exchange temperature difference between the heat exchange medium circulating water and the wall surface of the outer sleeve and a soil warming layer (medium-depth rock-soil).
Meanwhile, the longitudinal inner metal fins protruding on the inner wall can also fix a coaxial heat insulation inner pipe for conveying heat exchange medium circulating water, so that the consistency of a flow passage gap between the inner pipe and the outer pipe of the coaxial heat exchanger is ensured, and the heat exchange efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings of the embodiments will be briefly described.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the enhanced heat exchange outer tube according to the present invention. FIG. 3 is a schematic cross-sectional view of the outer tube for heat exchange enhancement and the inner tube for coaxial thermal insulation according to the present invention.
Wherein, 1, heat exchange strengthening outer sleeve; 2. a coaxial insulated inner tube; 3. longitudinal inner metal fins; 4. a longitudinal outer metal fin; 5. a soil temperature change layer and a constant temperature layer; 6. soil temperature increasing layer (medium-deep rock soil); 7. a wellhead water outlet end; 8. a wellhead water inlet end; 9. geothermal energy heat exchange units (plate heat exchangers or heat pumps); 10. an outer sleeve light pipe; 11. the soil temperature change layer and the constant temperature layer are made of heat insulation well cementation materials with low heat conductivity coefficients; 12. a well cementing material with high heat conductivity coefficient of a soil temperature increasing layer (medium-deep rock soil).
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings.
According to the figure 1, the middle-deep layer interference-free geothermal energy efficient coaxial heat exchange device comprises an enhanced heat exchange outer sleeve 1 absorbing heat from a soil warming layer (middle-deep rock soil) 6 and a coaxial heat insulation inner pipe 2 conveying heat exchange medium circulating water.
After the well is formed according to the conventional geothermal well drilling process, according to the difference of local geological conditions, the enhanced heat exchange outer sleeve 1 in the invention patent is arranged in a temperature increasing layer (middle-deep rock soil) 6 which is 300-4000 m below the earth surface, and the well is fixed by using a well fixing material 12 with high heat conductivity coefficient; setting an outer sleeve light pipe 10 in a soil temperature change layer and a constant temperature layer 5 which are 0-300 m below the ground surface, and cementing wells by using a heat insulating material 11 with low heat conductivity coefficient; a coaxial heat insulation inner pipe 2 for conveying heat exchange medium circulating water with low heat conductivity is continuously fed into the outer sleeve pipe 5 and the enhanced heat exchange outer sleeve 1.
After the construction of the underground coaxial heat exchange device is completed, a wellhead water outlet end 7 and a wellhead water inlet end 8 of the coaxial heat exchange device are respectively connected with a geothermal energy heat exchange unit (plate heat exchanger or heat pump) 9, heat exchange medium circulating water enters from a heat exchange channel between an outer sleeve and a coaxial heat insulation inner pipe, flows downwards to exchange heat with surrounding rock soil, and after the temperature gradually rises to the bottom, the circulating water flows from bottom to top from a coaxial heat insulation inner pipe 2 for conveying the heat exchange medium circulating water to enter the geothermal energy heat exchange unit (plate heat exchanger or heat pump) 9 for heat exchange, and the cooled circulating water enters the heat exchange channel again to perform next closed heat absorption cycle.
Compared with the prior light pipe outer sleeve heat exchange device, the reinforced heat exchange outer sleeve 1 of the high-efficiency coaxial heat exchange device has the advantages that the inner wall and the outer wall of the reinforced heat exchange outer sleeve are uniformly provided with the raised longitudinal metal fins, so that the effective heat exchange area is increased, the heat exchange between heat absorption medium circulating water and a rock-soil layer can be reinforced, the single-well heat exchange quantity is increased, the water outlet temperature is increased, and the investment for well digging at the heat source side and purchasing of heat pump equipment is reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A middle-deep layer interference-free geothermal energy efficient coaxial heat exchange device comprises a heat exchange enhancement outer sleeve (1) absorbing heat from a soil warming layer (6) and a coaxial heat insulation inner pipe (2) conveying heat exchange medium circulating water; the inner wall of the enhanced heat exchange outer sleeve (1) is provided with raised longitudinal inner metal fins (3), and the outer wall of the enhanced heat exchange outer sleeve is also provided with raised longitudinal outer metal fins (4).
2. The medium-deep layer interference-free geothermal energy efficient coaxial heat exchange device according to claim 1, characterized in that: the diameter of an equivalent coaxial circle formed by the longitudinal inner metal fins (3) protruding on the inner wall of the heat-transfer-enhancing outer sleeve (1) is larger than the outer diameter of the coaxial heat-insulating inner tube (2).
3. The medium-deep layer interference-free geothermal energy efficient coaxial heat exchange device according to claim 1, characterized in that: the number of longitudinal inner metal fins (3) protruding on the inner wall of the heat exchange enhancement outer sleeve (1) is not less than 3, and the number of longitudinal outer metal fins (4) protruding on the outer wall is not less than 12.
4. The medium-deep layer interference-free geothermal energy efficient coaxial heat exchange device according to claim 1, characterized in that: the heat exchange enhancement outer sleeve (1) and the longitudinal inner and outer metal fins (3) and (4) are integrally formed by aluminum alloy, carbon steel or alloy steel.
5. The medium-deep layer interference-free geothermal energy efficient coaxial heat exchange device according to claim 1, characterized in that: the reinforced heat exchange outer sleeve (1) is arranged in the soil temperature increasing layer (6), the upper part of the reinforced heat exchange outer sleeve is connected with an outer sleeve light pipe (10) of a coaxial heat exchange device which is arranged from the ground to the soil temperature changing layer and the constant temperature layer (5), and the middle part of the reinforced heat exchange outer sleeve is a coaxial heat insulation inner pipe (2) for conveying heat exchange medium circulating water.
6. The medium-deep layer interference-free geothermal energy efficient coaxial heat exchange device according to claim 1, characterized in that: the coaxial heat insulation inner pipe (2) for conveying the circulating water of the heat exchange medium is continuously dropped into the geothermal well from the light pipe (10) of the outer sleeve and the reinforced heat exchange outer sleeve (1).
7. The medium-deep layer interference-free geothermal energy efficient coaxial heat exchange device according to claim 1, characterized in that: a wellhead water outlet end (7) and a wellhead water inlet end (8) of the coaxial heat exchange device are respectively connected with a geothermal energy heat exchange unit (9) to form an interference-free geothermal energy closed heat absorption cycle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110342294.6A CN112923592A (en) | 2021-03-30 | 2021-03-30 | High-efficient coaxial heat transfer device of middle-deep layer noiseless geothermal energy |
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| CN202110342294.6A CN112923592A (en) | 2021-03-30 | 2021-03-30 | High-efficient coaxial heat transfer device of middle-deep layer noiseless geothermal energy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113587464A (en) * | 2021-06-30 | 2021-11-02 | 北京市地质工程勘察院 | Open type coaxial sleeve heat exchange system for geothermal well |
| CN113883735A (en) * | 2021-09-29 | 2022-01-04 | 万江新能源集团有限公司 | Deep well heat exchange heat pump system utilizing working medium phase change heat absorption |
| CN114961657A (en) * | 2022-05-24 | 2022-08-30 | 吉林大学 | Construction method of underground efficient heat exchange system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2056040A1 (en) * | 2007-10-31 | 2009-05-06 | Broder AG | Spacer for tubes of geothermal heat probe |
| CN204830951U (en) * | 2015-07-06 | 2015-12-02 | 徐德龙 | Reinforce deep rock stratum heat transfer system in underground of heat transfer |
| CN107477895A (en) * | 2017-09-29 | 2017-12-15 | 上海中金能源投资有限公司 | Mid-deep strata underground heat bore hole heat exchanger |
| CN210374724U (en) * | 2019-02-19 | 2020-04-21 | 西安乐金新能源技术有限公司 | Heat exchanger in middle-deep geothermal heat exchange well |
| 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 |
-
2021
- 2021-03-30 CN CN202110342294.6A patent/CN112923592A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2056040A1 (en) * | 2007-10-31 | 2009-05-06 | Broder AG | Spacer for tubes of geothermal heat probe |
| CN204830951U (en) * | 2015-07-06 | 2015-12-02 | 徐德龙 | Reinforce deep rock stratum heat transfer system in underground of heat transfer |
| CN107477895A (en) * | 2017-09-29 | 2017-12-15 | 上海中金能源投资有限公司 | Mid-deep strata underground heat bore hole heat exchanger |
| CN210374724U (en) * | 2019-02-19 | 2020-04-21 | 西安乐金新能源技术有限公司 | Heat exchanger in middle-deep geothermal heat exchange well |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113587464A (en) * | 2021-06-30 | 2021-11-02 | 北京市地质工程勘察院 | Open type coaxial sleeve heat exchange system for geothermal well |
| CN113883735A (en) * | 2021-09-29 | 2022-01-04 | 万江新能源集团有限公司 | Deep well heat exchange heat pump system utilizing working medium phase change heat absorption |
| CN114961657A (en) * | 2022-05-24 | 2022-08-30 | 吉林大学 | Construction method of underground efficient heat exchange system |
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