CN114893930A - High-efficient heat transfer system of buried pipe based on compound pipe of different materials - Google Patents
High-efficient heat transfer system of buried pipe based on compound pipe of different materials Download PDFInfo
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- CN114893930A CN114893930A CN202210416832.6A CN202210416832A CN114893930A CN 114893930 A CN114893930 A CN 114893930A CN 202210416832 A CN202210416832 A CN 202210416832A CN 114893930 A CN114893930 A CN 114893930A
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- 239000000463 material Substances 0.000 title claims abstract description 55
- 238000012546 transfer Methods 0.000 title claims abstract description 21
- 150000001875 compounds Chemical class 0.000 title claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 118
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 239000000440 bentonite Substances 0.000 claims description 17
- 229910000278 bentonite Inorganic materials 0.000 claims description 17
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 9
- 230000001502 supplementing effect Effects 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 14
- 238000005086 pumping Methods 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000004698 Polyethylene Substances 0.000 description 18
- 229920000573 polyethylene Polymers 0.000 description 18
- 238000011161 development Methods 0.000 description 9
- -1 Polyethylene Polymers 0.000 description 7
- 238000013461 design Methods 0.000 description 3
- 239000003673 groundwater Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F24T10/15—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 bent tubes; using tubes assembled with connectors or with return headers
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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 provides a buried pipe efficient heat exchange system based on composite pipes made of different materials, which is used for developing and utilizing shallow geothermal energy resources and mainly comprises a backfill material, a heat exchange device and a heat transfer device. The invention provides a heat exchange pipeline in a water-containing layer by using a metal galvanized iron pipe, which has the heat transfer performance far higher than that of a common heat exchange pipeline; the permeable material is used as a backfill material for the drilled hole in the water-containing layer, and the heat exchange efficiency can be greatly improved due to the convection heat exchange of water; in the area with good aquifer condition, the technology can effectively utilize the shallow geothermal energy of the area. The invention has the beneficial effects that: the heat exchange efficiency is improved, the working performance of the heat pump is greatly improved, and the engineering problem caused by pumping and recharging in the technical application is avoided; the technology is adopted in areas with abundant underground water and good aquifer conditions, so that the technical scheme of the heat pump is diversified, and the performance is more efficient and stable.
Description
Technical Field
The invention relates to the technical field of water source heat pumps, in particular to the technical field of metal buried pipe heat exchange, and particularly relates to a buried pipe efficient heat exchange system based on composite pipes made of different materials.
Background
Geothermal energy is one kind of new energy, and belongs to clean renewable energy. The geothermal energy is not influenced by the change of seasons and day and night, the system runs stably, the potential of long-term development and utilization is realized, the system is a bright spot field of the development of the current renewable energy sources, particularly shallow geothermal resources, and the development and utilization potential is huge.
The underground aquifer is used as a good shallow geothermal energy heat storage place and has high geothermal development and utilization potential. Because the aquifer is positioned below the underground water level and the medium is completely saturated with water, the specific heat capacity of water is larger than that of a common rock-soil body medium, so that the geothermal energy existing in the aquifer is richer than that of a water-resisting layer and a non-saturated zone, and the shallow geothermal resource has the characteristic of large energy storage per unit volume. In the aspect of development and utilization of shallow geothermal energy, the aquifer geothermal energy is easy to develop, and the technical forms are various. Numerous engineering examples show that the development and utilization efficiency and sustainability of the water-impermeable layer are obviously superior to those of a water-impermeable layer. Particularly, under the condition of existing underground water seepage, the temperature in the aquifer can be continuously updated, the energy sustainability is good, and the method is more suitable for shallow geothermal energy development and utilization.
The heat exchange technology is used as an important part for exploiting shallow geothermal energy in the aquifer, and the quality of the technical performance directly determines the application scale of the geothermal energy in the aquifer and develops the energy efficiency. However, the existing water-bearing stratum internal heat exchange technology has the defects of low heat exchange efficiency or poor geological environment problem and the like, and greatly limits the development of geothermal energy of the water-bearing stratum.
At present, the technology for shallow geothermal energy exploitation of aquifers mainly comprises an open system and a closed system. The closed system utilizes a Polyethylene (PE) pipe used by a vertical U-shaped heat exchanger and the like to have very low heat conduction, in order to isolate underground water, bentonite with low heat conduction is usually used as backfill materials, backfill quality between the pipe and a hole wall is difficult to control, fluid in the pipe can realize heat transfer with a rock-soil body only through a plurality of layers of section heat resistances and low heat conduction materials, the process mainly adopts heat conduction, the heat exchange efficiency is low, the phenomenon of underground heat accumulation is easily formed when the cold and heat loads of a building are uneven, and the sustainability is poor. The other is an open system, the system pumps the underground water through a submersible pump and directly sends the underground water into a heat pump unit, and the system is simple in composition and low in cost. The underground heat exchange of the open system mainly adopts convection heat exchange, and the heat transfer efficiency is higher. However, such open systems present significant geologic environmental problems such as pump down, recharge plugging, system oxidation and scaling.
The two mining technologies have the defects that efficient heat exchange in the water-containing layer can not be realized on the premise of protecting underground water resources. Therefore, innovations in groundwater source heat exchange technology are needed to improve heat exchange efficiency and avoid geological and environmental problems caused in the process of technology application.
The existing water-containing layer internal heat exchange technology is based on the consideration of the underground water pumping and recharging form, the ground heat exchanger form and the like, the water-containing layer internal heat exchange technology is innovated, but the aspects of replacing ground heat exchange materials, setting water-containing layer internal backfill materials, avoiding pumping water and recharging and the like are not considered. The patent well considers the characteristics of convective heat transfer of underground water in the aquifer, can realize high-efficiency heat transfer in the aquifer by optimizing the buried pipe technology, and simultaneously avoids the problems of hydrogeology and geotechnical engineering caused by pumping and recharging. Provides a new idea for exploiting shallow geothermal energy in regions with abundant groundwater resources.
Disclosure of Invention
In order to solve the problems, the invention provides a buried pipe efficient heat exchange system based on composite pipes made of different materials, which is used for developing and utilizing shallow geothermal energy resources. The buried pipe efficient heat exchange system mainly comprises a backfill material, a heat exchange device and a heat transfer device, wherein the heat exchange device is positioned in the backfill material, and the top end of the heat exchange device is connected with the heat transfer device.
The backfill material is used for backfilling the positions of the drilling water-resisting layer and the aquifer;
the heat exchange device comprises a galvanized iron pipe and a PE pipe and is used for carrying out heat exchange between fluid in the pipe and moisture around the pipe wall;
the heat transfer device is used for controlling the gas discharge in the pipe and monitoring the temperature of inlet and outlet water and the height of water level in the water tank in real time.
Furthermore, the backfill material comprises a bentonite sand-adding mixed material and a permeable material, the bentonite sand-adding mixed material is positioned above the permeable material, the bentonite sand-adding mixed material is used for backfilling the position of the water-proof layer of the drilled hole, and the permeable material is used for backfilling the position of the water-proof layer of the drilled hole.
Further, the bentonite and sand mixed material is formed by mixing bentonite and fine sand.
Further, the galvanized iron pipe and the PE pipe are connected through a threaded fitting.
Furthermore, the diameter of the galvanized iron pipe is 32-50mm, and the galvanized iron pipe is arranged in the water-containing layer to ensure that the fluid in the pipe exchanges heat with the moisture around the pipe wall.
Furthermore, the pipe diameter of the PE pipe is 32-50mm, and the PE pipe is installed at the position of a water-resisting layer to play a role in heat preservation.
Furthermore, the heat transfer device comprises a water inlet pipeline, a water inlet temperature sensor, a water outlet pipeline, a water outlet temperature sensor, an exhaust valve, a pipeline circulating pump and a constant pressure water supplementing device, wherein the water inlet pipeline and the water outlet pipeline are connected with the heat exchange device, and the water inlet temperature sensor and the thermometer are arranged on the water inlet pipeline and used for monitoring the water inlet temperature in real time; the water outlet pipeline is connected with the galvanized iron pipe and used for conveying the circulated liquid; the exhaust valve is arranged on the water outlet pipeline and used for controlling the gas in the pipe to be exhausted; and the water outlet temperature sensor and the thermometer are arranged on the water outlet pipeline and used for monitoring the temperature in the water outlet pipeline in real time.
Furthermore, the pipeline circulating pump is a centrifugal pump, and water in the pipeline is driven to circularly flow by the rotating impeller.
The technical scheme provided by the invention has the following beneficial effects:
1. permeable materials are selected around the buried pipe in the drill hole as backfill materials of the water-containing layer, so that underground water can freely pass around the buried pipe, and the heat exchange efficiency is improved in a convection heat exchange mode;
2. a metal galvanized iron pipe is adopted in the water-containing layer, and a Polyethylene (PE) pipe is adopted in the water-resisting layer as a heat exchange pipeline, so that heat exchange in the water-containing layer is ensured, the heat exchange efficiency of the heat exchange pipe is improved, and the working performance of the heat pump is greatly improved;
3. according to the design concept of 'taking heat but not taking water', the heat exchange is carried out in the aquifer in a buried pipe mode, so that the engineering problem caused by pumping and recharging in the technical application is avoided;
4. the technology is adopted in areas with abundant underground water and good aquifer conditions, so that the technical scheme of the heat pump is diversified, and the performance is more efficient and stable.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a structural diagram of a buried pipe efficient heat exchange system based on composite pipes made of different materials in an embodiment of the invention.
The numbers in the figure indicate: 1. a water inlet pipe; 2. a constant pressure water replenishing device; 3. an exhaust valve; 4. an inlet water temperature sensor and a thermometer; 5, PE pipe; 6. a water outlet pipeline; 7. a pipeline circulation pump; 8. an effluent temperature sensor and a thermometer; 9. drilling hole walls; 10. adding a sand mixture into the bentonite; 11. a water barrier layer; 12. a permeable material; 13. an aqueous layer; galvanized iron pipe.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a structural diagram of a buried pipe efficient heat exchange system based on composite pipes made of different materials in an embodiment of the present invention, which is applied to development and utilization of shallow geothermal energy resources in a subterranean water-containing zone, and specifically includes: backfill material, heat exchange means and heat transfer means.
The backfill material mainly comprises a bentonite sand-added mixture 10 and a permeable material 12, wherein the bentonite sand-added mixture 10 is positioned above the permeable material 12; the bentonite sand-adding mixture 10 is formed by mixing bentonite and fine sand and is used for backfilling a drilling water-resisting layer; the permeable material 12 is used to backfill the water-bearing formation locations of the borehole to satisfy the flow of water within the water-bearing formation and to promote convective heat transfer from the groundwater.
The heat exchange device consists of a galvanized iron pipe 14 and a Polyethylene (PE) pipe 5; the top end of the galvanized iron pipe 14 is connected with the polyethylene pipe 5 through a threaded fitting, the galvanized iron pipe 14 and the polyethylene pipe 5 are inserted into the hole wall 9 of the drilled hole, then the backfilling material is backfilled into the hole wall 9 of the drilled hole, the permeable material 12 is backfilled into a position corresponding to the aquifer 13, and the bentonite and sand mixed material 10 is backfilled into a position corresponding to the waterproof layer 11 above the aquifer 13. The galvanized iron pipe 14 is a U-shaped pipe, the pipe diameter of the galvanized iron pipe is 32-50mm, the galvanized iron pipe has good heat conduction capacity, the galvanized iron pipe is arranged in the aquifer, so that heat exchange is carried out between fluid in the pipe and water around the pipe wall, and energy is mainly transferred through the aquifer; the pipe diameter of the Polyethylene (PE) pipe 5 is 32-50mm, and the PE pipe is installed at the position of a water-resisting layer and used for playing a role in heat preservation.
Heat transfer device mainly comprises inlet channel 1, temperature sensor and thermometer 4, outlet conduit 6, play water temperature sensor and thermometer 8, air discharge valve 3, pipeline circulating pump 7 and level pressure moisturizing device 2, inlet channel 1 and outlet conduit 6 are connected with heat exchange device, set gradually level pressure moisturizing device 2, air discharge valve 3 and inlet water temperature sensor and thermometer 4 on this inlet channel 1, set gradually pipeline circulating pump 7 and play water temperature sensor and thermometer 8 on outlet conduit 6, and this inlet water temperature sensor and thermometer 4 are used for real-time supervision inlet water temperature. The exhaust valve 3 is installed on the water inlet pipeline 1 and used for controlling gas in the pipeline to be discharged, the pipeline circulating pump 7 is a centrifugal pump and drives water in the pipeline to flow circularly through the rotating impeller, and the water outlet temperature sensor and the thermometer 8 are installed on the water outlet pipeline 6 and used for monitoring the temperature in the water outlet pipeline in real time. The constant pressure water supplementing device comprises a water supplementing device and a water tank, wherein a water level meter is arranged on the water tank, the water level height in the water tank is monitored in real time, when the water level in the water tank is reduced to the lowest scale mark of the design, a water supplementing pipeline of the water supplementing device is automatically opened, current signals are transmitted to a system through parameters of the water level meter, when the water level is insufficient, the current value is lower than the preset minimum value, a valve of the water supplementing pipeline of system control is opened, the water is automatically supplemented into the water tank, and when the water level reaches the designed water level line, the water supplementing device is automatically closed, and the constant pressure water supplementing effect is achieved.
The galvanized iron pipe 14 is used as a heat exchange pipeline in the water-containing layer, and the heat transfer performance of the galvanized iron pipe is far higher than that of a common heat exchange pipeline; the permeable material 12 is used as a borehole backfill material, and the heat exchange efficiency can be greatly improved due to the convective heat exchange of water; in the area with good aquifer condition, the application of the technology can effectively utilize the shallow geothermal energy of the area.
The invention has the beneficial effects that:
1. permeable materials are selected around the buried pipe in the drill hole as backfill materials of the water-containing layer, so that underground water can freely pass around the buried pipe, and the heat exchange efficiency is improved in a convection heat exchange mode;
2. a metal galvanized iron pipe is adopted in the water-containing layer, and a Polyethylene (PE) pipe is adopted in the water-resisting layer as a heat exchange pipeline, so that heat exchange in the water-containing layer is ensured, the heat exchange efficiency of the heat exchange pipe is improved, and the working performance of the heat pump is greatly improved;
3. according to the design concept of 'taking heat but not taking water', the heat exchange is carried out in the aquifer in a buried pipe mode, so that the engineering problem caused by pumping and recharging in the technical application is avoided;
4. the technology is adopted in areas with abundant underground water and good aquifer conditions, so that the technical scheme of the heat pump is diversified, and the performance is more efficient and stable.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a high-efficient heat transfer system of buried pipe based on compound pipe of different materials which characterized in that: comprises backfill materials, a heat exchange device and a heat transfer device; the heat exchange device is positioned in the backfill material, and the top end of the heat exchange device is connected with the heat transfer device;
the backfill material is used for backfilling the positions of the drilling water-resisting layer and the aquifer;
the heat exchange device comprises a galvanized iron pipe and a PE pipe and is used for carrying out heat exchange between fluid in the pipe and moisture around the pipe wall;
the heat transfer device is used for controlling the gas discharge in the pipe and monitoring the temperature of inlet and outlet water and the height of water level in the water tank in real time.
2. The system of claim 1, wherein the buried pipe high-efficiency heat exchange system is based on composite pipes made of different materials, and comprises: the backfill material comprises a bentonite sand-added mixture and a permeable material, the bentonite sand-added mixture is positioned above the permeable material, the bentonite sand-added mixture is used for backfilling the position of the water-proof layer of the drilled hole, and the permeable material is used for backfilling the position of the water-containing layer of the drilled hole.
3. The system of claim 2, wherein the buried pipe high-efficiency heat exchange system is based on composite pipes made of different materials, and comprises: the bentonite and sand mixture is formed by mixing bentonite and fine sand.
4. The system of claim 1, wherein the buried pipe high-efficiency heat exchange system is based on composite pipes made of different materials, and comprises: the galvanized iron pipe and the PE pipe are connected through a threaded fitting.
5. The system of claim 1, wherein the buried pipe high-efficiency heat exchange system is based on composite pipes made of different materials, and comprises: the galvanized iron pipe has a pipe diameter of 32-50mm and is arranged in the water-containing layer to ensure that the fluid in the pipe exchanges heat with the water around the pipe wall.
6. The system of claim 1, wherein the buried pipe high-efficiency heat exchange system is based on composite pipes made of different materials, and comprises: the pipe diameter of the PE pipe is 32-50mm, and the PE pipe is arranged at the position of a water-resisting layer to play a role in heat preservation.
7. The system of claim 1, wherein the buried pipe high-efficiency heat exchange system is based on composite pipes made of different materials, and comprises: the heat transfer device comprises a water inlet pipeline, a water inlet temperature sensor, a water outlet pipeline, a water outlet temperature sensor, an exhaust valve, a pipeline circulating pump and a constant pressure water supplementing device, wherein the water inlet pipeline and the water outlet pipeline are connected with the heat exchange device, and the water inlet temperature sensor and a thermometer are arranged on the water inlet pipeline and used for monitoring the water inlet temperature in real time; the water outlet pipeline is connected with the galvanized iron pipe and used for conveying the circulated liquid; the exhaust valve is arranged on the water outlet pipeline and used for controlling the gas in the pipe to be exhausted; and the water outlet temperature sensor and the thermometer are arranged on the water outlet pipeline and used for monitoring the temperature in the water outlet pipeline in real time.
8. The system of claim 7, wherein the buried pipe high-efficiency heat exchange system is based on composite pipes made of different materials, and comprises: the pipeline circulating pump is a centrifugal pump, and water in the pipeline is driven to circularly flow by the rotating impeller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210416832.6A CN114893930A (en) | 2022-04-20 | 2022-04-20 | High-efficient heat transfer system of buried pipe based on compound pipe of different materials |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210416832.6A CN114893930A (en) | 2022-04-20 | 2022-04-20 | High-efficient heat transfer system of buried pipe based on compound pipe of different materials |
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| CN114893930A true CN114893930A (en) | 2022-08-12 |
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| CN202210416832.6A Pending CN114893930A (en) | 2022-04-20 | 2022-04-20 | High-efficient heat transfer system of buried pipe based on compound pipe of different materials |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115949075A (en) * | 2023-03-13 | 2023-04-11 | 山东科技大学 | Dry-type backfilling method for shallow geothermal energy ground heat exchanger shaft |
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2022
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