CN110319622B - High-heat-conductivity ground temperature energy heat exchange tunnel system and construction method thereof - Google Patents
High-heat-conductivity ground temperature energy heat exchange tunnel system and construction method thereof Download PDFInfo
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- CN110319622B CN110319622B CN201910402591.8A CN201910402591A CN110319622B CN 110319622 B CN110319622 B CN 110319622B CN 201910402591 A CN201910402591 A CN 201910402591A CN 110319622 B CN110319622 B CN 110319622B
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- 238000004146 energy storage Methods 0.000 claims abstract description 26
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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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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- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/04—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone
- F28F21/045—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone for domestic or space-heating systems
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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
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The invention discloses a high-heat-conductivity geothermal energy heat exchange tunnel system which comprises an upper tunnel secondary lining and a lower tunnel inverted arch, wherein the upper tunnel secondary lining and the lower tunnel inverted arch are mutually matched, a surface-mounted prefabricated geotextile bag heat exchange layer is paved on the upper surface of the tunnel inverted arch, the surface-mounted prefabricated geotextile bag heat exchange layer comprises a geotextile bag, a heat exchange tube and high-heat-conductivity filler, the heat exchange tube and the high-heat-conductivity filler are positioned in the geotextile bag, a lower waterproof layer is paved on the surface of the surface-mounted prefabricated geotextile bag heat exchange layer, a phase-change energy storage layer is filled in the lower waterproof layer, a paving plane is formed on the upper surface of the phase-change energy storage layer, an upper waterproof layer is paved on the upper paving plane, a heat insulation layer is arranged on the upper waterproof layer, a pavement layer positioned in the middle part and a water pipe ditch positioned on the side are arranged on, The water return pipe is communicated with the water outlet of the heat exchange pipe. The advantages are that: the operation is simple, the engineering applicability is strong, and the heat storage thermal response is low.
Description
Technical Field
The invention relates to the technical field of energy utilization, in particular to a high-heat-conductivity geothermal energy heat exchange tunnel system. The invention also relates to a construction method of the high-heat-conductivity geothermal energy heat exchange tunnel system.
Background
The energy tunnel technology combines a ground source heat pump system and a tunnel engineering lining structure, utilizes shallow geothermal energy in tunnel surrounding rocks or surrounding soil layers to heat or refrigerate buildings in or near a tunnel, and is a new technology with energy conservation, emission reduction and low operation cost.
In general, in the construction of an energy tunnel, a heat exchange tube is buried between a primary support and a secondary lining of the tunnel or in a shield segment, and tunnel surrounding rocks or surrounding soil layers are used as heat exchange layers. For example, the chinese patent application with application publication No. CN106437792A discloses an energy tunnel inverted arch layer buried geothermal energy anti-freezing heating system, which includes a tunnel heat exchange section and a tunnel heating section, wherein a heat exchange layer is disposed between the tunnel inverted arch and a backfill layer in a tunnel corresponding to the tunnel heat exchange section, a first water inlet of the heat exchange layer is communicated with a first water supply pipe, a first water outlet of the heat exchange layer is communicated with a first water return pipe, and the first water supply pipe and the first water return pipe are both connected with the front end of a heat pump to form a heat exchange circulation pipeline; and in the tunnel corresponding to the tunnel heating section, heat supply layers are arranged between the primary tunnel lining and the secondary tunnel lining and between the road surface and the backfill layer, a second water inlet of each heat supply layer is communicated with a second water supply pipe, a second water return port of each heat supply layer is communicated with a second water return pipe, and the second water supply pipe and a second recovery pipe are connected with the rear end of the heat pump to form a heat supply circulation pipeline. The invention has the advantages of good applicability, higher heat exchange efficiency, cost saving and construction period saving. However, the heat-conducting liquid has larger resistance to penetrate through the water-permeable material under the action of pressure, and has higher requirement on the water pump; the heat exchange layer has higher requirements on the compactness and porosity of on-site paving and compacting, so that the construction difficulty is increased; and the construction method is relatively complicated to operate, influences the construction period and influences the water stopping problem of the tunnel to a certain extent. In addition, most of the current energy tunnel technology focuses on utilizing ground temperature energy for anti-freezing heating, neglects the functions of storing heat energy and refrigerating buildings in the tunnel and nearby buildings, weakens the functionality and has certain limitation. Therefore, it is very urgent to establish a set of energy tunnel technology and a construction method thereof, which are simple in operation, strong in engineering applicability, low in heat storage and thermal response and high in geothermal energy utilization efficiency.
Disclosure of Invention
The invention aims to provide a high-heat-conductivity ground temperature energy heat exchange tunnel system which has the characteristics of simplicity in operation, strong engineering applicability and low heat storage thermal response. The invention also discloses a construction method of the high-heat-conductivity geothermal energy heat exchange tunnel system.
In order to achieve the purpose, the invention adopts the technical scheme that:
the high-heat-conductivity geothermal energy heat exchange tunnel system comprises a tunnel secondary lining and a tunnel inverted arch, wherein the tunnel secondary lining is positioned above the tunnel secondary lining, the tunnel inverted arch is positioned below the tunnel secondary lining, a surface-mounted prefabricated geotextile bag heat exchange layer is laid on the upper surface of the tunnel inverted arch, the patch type prefabricated geotextile bag heat exchange layer comprises a geotextile bag, a heat exchange tube and a high heat conduction filler which are positioned in the geotextile bag, and simultaneously, the patch type prefabricated geotextile bag heat exchange layer is paved with a lower waterproof layer, the lower waterproof layer is filled with a phase change energy storage layer, the upper surface of the phase-change energy storage layer forms a paving plane, an upper waterproof layer is paved on the upper part of the paving plane, be equipped with the thermal insulation layer on this last waterproof layer, the upper portion of this thermal insulation layer is equipped with the road surface layer that is located the middle part and is located the water pipe ditch of avris, is equipped with delivery pipe and wet return in the water pipe ditch, and the delivery pipe communicates the water inlet of heat exchange tube, the delivery port of wet return intercommunication heat exchange tube.
The heat conductivity coefficient of the high heat conduction filler is as follows: 150-200 w/(m.k).
The high heat conduction filler is prepared from (3-5) by weight: (1-3): (1-2): 1, aluminum nitride, silicon carbide, magnesium oxide and fibrous high-heat-conductivity carbon powder.
The phase change energy storage layer is prepared from (2-3): 1, and the phase-change energy storage layer has a void ratio of 20-25%.
The construction method of the high-heat-conductivity ground temperature energy heat exchange tunnel system comprises the following steps:
A. embedding the heat exchange tube and the high heat conduction filler in the geotextile bag;
B. excavating a tunnel, constructing an inverted arch of the tunnel, and laying a geotextile bag on the upper surface of the inverted arch of the tunnel to form a surface-mounted prefabricated geotextile bag heat exchange layer;
C. laying a lower waterproof layer, a phase change energy storage layer, an upper waterproof layer and a heat insulation layer above a patch type prefabricated geotextile bag heat exchange layer on an inverted arch of a tunnel in sequence, and compacting, wherein the phase change energy storage layer is sealed after two sides of the upper waterproof layer and two sides of the lower waterproof layer are in sealed lap joint at two sides of the tunnel;
D. a water inlet and a water outlet of a heat exchange tube in the patch type prefabricated geotextile bag heat exchange layer penetrate out of the upper waterproof layer and the heat insulation layer upwards, and sealing treatment is carried out;
E. paving a pavement layer on the heat-insulating layer, reserving a water pipe ditch at the side of the pavement layer, laying a water supply pipe and a water return pipe in the water pipe ditch, and then communicating the water supply pipe with a water inlet of the heat exchange pipe and the water return pipe with a water outlet of the heat exchange pipe.
Compared with the prior art, the invention has the advantages that: the operation is simple, the engineering applicability is strong, and the heat storage thermal response is low. Specifically, the present invention is improved in the following seven aspects:
(1) the phase change energy storage layer is additionally arranged, so that the dual functions of heating or cooling in the tunnel and nearby buildings are realized, the energy storage capacity is large, the functionality of the heat exchange system of the energy tunnel is improved, and the applicability of the energy tunnel in regions with clear seasons is particularly improved.
(2) When the energy tunnel is heated by heat storage or heated and cooled, the peripheral structure, particularly the road surface, can generate large temperature stress, and the problem of damage of temperature crack, deformation and settlement can be generated in serious cases. Namely, a certain porosity is left in the phase change energy storage layer, so that structural damage caused by volume change during energy storage and phase change of the phase change material is avoided.
(3) The heat exchange layer adopts a prefabricated patch type geotextile bag, can be produced in advance in a quantitative mode, does not need to arrange heat exchange tubes on site, is simple and convenient to construct and operate, occupies a small area, has strong engineering applicability and is convenient for engineering popularization.
(4) The heat exchange tube specification form in the prefabricated geotechnical cloth bag can be various, can follow the full width of tunnel and arrange according to the demand, also can half wide arrange, still can constitute two sets of systems, alternate use to reduce pipeline ageing loss speed.
(5) The high-heat-conductivity filler is filled in the prefabricated geotextile bag, so that the problem of a linear heat source of a heat exchange pipe is solved, the heat exchange efficiency of the heat exchange layer is increased, local nonuniform temperature difference stress and deformation in the layer are reduced, and the safety and durability of the surface-mounted prefabricated geotextile bag heat exchange layer in the using process are improved.
(6) The water supply pipe and the water return pipe circulation loop are connected in parallel between the patch type prefabricated geotextile bags, the flow rate of heat exchange fluid and the use condition of each subcircuit can be flexibly adjusted through a valve according to the requirement of a user side, and the system has the advantages of good controllability, high energy utilization rate and low operation cost.
(7) The heat exchange system utilizes renewable shallow geothermal energy, greatly reduces carbon emission, and belongs to the renewable clean energy technology.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a front view of a high thermal conductivity geothermal energy heat exchange tunnel system of an embodiment of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
fig. 4 is a schematic diagram of the connection of the present invention in use.
In the figure:
1. a tunnel secondary lining;
2. a tunnel inverted arch;
3. a surface-mounted prefabricated geotextile bag heat exchange layer 301, heat exchange tubes 302 and high-heat-conductivity filler;
4. a lower waterproof layer;
5. a phase change energy storage layer 501, paving a plane;
6. a waterproof layer is arranged;
7. a heat insulation layer;
8. a pavement layer;
9. a water pipe ditch;
10. a water supply pipe;
11. a water return pipe;
12. a water pump;
13. a heat pump;
14. a user side;
15. and an energy supply end.
Detailed Description
Examples, see fig. 1-4: the high heat conduction geothermal energy heat exchange tunnel system comprises a tunnel secondary lining 1 and a tunnel inverted arch 2, wherein the tunnel secondary lining 1 is located above and the tunnel inverted arch 2 is located below, and the tunnel secondary lining and the tunnel inverted arch are matched with each other. I.e. in cross-section, the tunnel secondary lining 1 and the tunnel invert 2 form a closed ring.
Further speaking:
a patch type prefabricated geotextile bag heat exchange layer 3 is laid on the upper surface of the tunnel inverted arch 2. The patch type prefabricated geotextile bag heat exchange layer 3 comprises a geotextile bag (not shown in the figure), and a heat exchange pipe 301 and a high heat conduction filler 302 which are positioned in the geotextile bag. Wherein, the length of the geotextile bag is prefabricated according to the design requirement; the convenience of site construction is comprehensively considered, the heat exchange tube 301 can be arranged in the full width or half width, and the heat exchange tube 301 can be arranged in the transverse direction of the tunnel, in the longitudinal direction of the tunnel or in the shape of a square. Meanwhile, a lower waterproof layer 4 is laid on the surface-mounted prefabricated geotextile bag heat exchange layer 3, a phase change energy storage layer 5 is filled in the lower waterproof layer 4, a paving plane 501 is formed on the surface of the upper portion of the phase change energy storage layer 5, an upper waterproof layer 6 is laid on the upper portion of the paving plane 501, a heat preservation and insulation layer 7 is arranged on the upper waterproof layer 6, and a pavement layer 8 located in the middle and a water pipe ditch 9 located on the side are arranged on the upper portion of the heat preservation and insulation layer 7. The paving surface 501 is a substantially horizontal surface for paving a road; the water pipe ditch 9 can be 2 on both sides of the pavement layer 8 or one on one side of the pavement layer 8. A water supply pipe 10 and a water return pipe 11 are arranged in the water pipe ditch 9, the water supply pipe 10 is communicated with a water inlet of the heat exchange pipe 301, and the water return pipe 11 is communicated with a water outlet of the heat exchange pipe 301. That is, after all the heat exchange tubes 301 are connected in parallel, the water inlets of the heat exchange tubes 301 are communicated with the water supply tube 10, and after all the heat exchange tubes 301 are connected in parallel, the water outlets of the heat exchange tubes 301 are communicated with the water return tube 11, then the water supply tube 10 and the water return tube 11 are connected by the water pump 12 to form a closed circulation loop, and finally, the user terminal 14 and the energy supply terminal 15 are connected to the heat pump 13, and the heat pump 13 is connected in series in the closed circulation loop formed by connecting the water pump 12, the water supply tube 10 and the water return tube 11 to. Of course, this is a common connection mode and is not described in detail. Therefore, the high-heat-conductivity geothermal energy heat exchange tunnel system utilizes reproducible shallow geothermal energy, greatly reduces carbon emission, belongs to a renewable clean energy technology, and is high in engineering applicability and convenient for engineering popularization.
Optimizing:
the high thermal conductive filler 302 is made of a material with a high thermal conductivity, and in this embodiment, the thermal conductivity of the high thermal conductive filler 302 is: 150-200 w/(m.k). For example, the thermal conductivity of the high thermal conductive filler 302 is: 150. 180 or 200 w/(m.k). The high heat conduction filler 302 is prepared from (3-5): (1-3): (1-2): 1, aluminum nitride, silicon carbide, magnesium oxide and fibrous high-heat-conductivity carbon powder. For example, the weight ratio of aluminum nitride, silicon carbide, magnesium oxide and fibrous high-thermal-conductivity carbon powder is 3: 1: 1.5: 1, or 4: 2: 1: 1, or 5: 3: 2: 1. the thermal conductivity coefficients of the aluminum nitride, the silicon carbide, the magnesium oxide and the fibrous high thermal conductivity carbon powder are respectively 80-320 w/(m.k), 83 w/(m.k), 36 w/(m.k) and 22 w/(m.k).
The phase change energy storage layer 5 comprises the following components in parts by weight (2-3): 1, the light macadam filler and the phase change material are mixed. For example, the weight ratio of the light macadam filler to the phase-change material is 2: 1. 2.5: 1 or 3: 1. the phase change energy storage layer 5 has a void fraction of 20-25%, such as 20, 22 or 25% in particular. Wherein, the particle size of the light macadam can be 2.0-4.0 cm, the phase-change material can be halides, nitrates, sulfates, phosphates, carbonates and acetates of alkali and alkaline earth metals, or higher aliphatic hydrocarbons, fatty acids or esters or salts thereof, alcohols, aromatic hydrocarbons, aromatic ketones, amides, freons and polyhydroxy compounds. Therefore, the structural damage caused by the volume change of the phase-change material during the energy storage and phase change of the phase-change material is avoided.
The construction method of the high-heat-conductivity ground temperature energy heat exchange tunnel system comprises the following steps:
A. the heat exchange pipe 301 and the high thermal conductive filler 302 are embedded in the geotextile bag in advance.
B. And (5) excavating the tunnel and constructing an inverted arch 2 of the tunnel. And laying a geotextile bag on the upper surface of the tunnel invert 2 to form a patch type prefabricated geotextile bag heat exchange layer 3. At this time, the heat exchange tubes 301 in the respective geotextile bags may be connected in parallel.
C. A lower waterproof layer 4, a phase change energy storage layer 5, an upper waterproof layer 6 and a heat insulation layer 7 are sequentially laid above a patch type prefabricated geotextile bag heat exchange layer 3 on a tunnel inverted arch 2 and compacted. Wherein, the two sides of the upper waterproof layer 6 and the two sides of the lower waterproof layer 4 are in sealed lap joint at the two sides of the tunnel, and then the phase change energy storage layer 5 is sealed.
D. The water inlet of the heat exchange tube 301 in the patch type prefabricated geotextile bag heat exchange layer 3 is upwards penetrated out of the upper waterproof layer 6 and the heat insulation layer 7 through a pipeline and the water outlet through another pipeline, and sealing treatment is performed.
E. A pavement layer 8 is laid on the heat insulation layer 7, and a water pipe ditch 9 is reserved on the side of the pavement layer 8. A water supply pipe 10 and a water return pipe 11 are arranged in the water pipe trench 9. The water supply pipe 10 and the water return pipe 11 may be disposed at one side in the water pipe groove 9 or disposed at both sides in the water pipe groove 9. Then, the water supply pipe 10 is connected to the water inlet of the heat exchange pipe 301, and the water return pipe 11 is connected to the water outlet of the heat exchange pipe 301.
F. A water supply pipe 10 and a water return pipe 11 are connected into a closed circulation loop through a water pump 12 to form a tunnel energy supply end system loop. The user end 14 and the energy supply end 15 are both connected to the heat pump 13, and the heat pump 13 and the water pump 12 are connected in series and then are also positioned in a closed circulation loop formed by connecting the water pump 12, the water supply pipe 10 and the water return pipe 11, so that energy collection exchange is realized.
The construction method has small interference on tunnel excavation and integral lining support, and the constructed system is little influenced by subsequent traffic in the tunnel and the like.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. The high-heat-conductivity geothermal energy heat exchange tunnel system comprises a tunnel secondary lining (1) and a tunnel inverted arch (2), wherein the tunnel secondary lining (1) is located above the tunnel inverted arch (2), the tunnel inverted arch (2) is located below the tunnel secondary lining, a surface-mounted prefabricated geotextile bag heat exchange layer (3) is laid on the upper surface of the tunnel inverted arch, a lower waterproof layer (4) is laid on the surface-mounted prefabricated geotextile bag heat exchange layer (3), a phase-change energy storage layer (5) is filled on the lower waterproof layer (4), and a laying plane (501) is formed on the upper surface of the phase-change energy storage layer (5); and, be located road surface layer (8) at middle part and be located water pipe ditch (9) of avris, be equipped with delivery pipe (10) and wet return (11) in this water pipe ditch (9), delivery pipe (10) intercommunication heat exchange tube (301) the water inlet, wet return (11) the delivery port that communicate heat exchange tube (301), its characterized in that: the patch type prefabricated geotextile bag heat exchange layer (3) comprises a geotextile bag, and a heat exchange tube (301) and a high heat conduction filler (302) which are positioned in the geotextile bag; an upper waterproof layer (6) is laid on the upper portion of the paving surface (501), a heat insulation layer (7) is arranged on the upper waterproof layer (6), and the pavement layer (8) and the water pipe ditch (9) are located on the upper portion of the heat insulation layer (7).
2. The geothermal energy heat exchange tunnel system with high thermal conductivity according to claim 1, wherein: the high thermal conductivity filler (302) has a thermal conductivity of: 150-200 w/(m.k).
3. The geothermal energy heat exchange tunnel system with high thermal conductivity according to claim 2, wherein: the high heat conduction filler (302) is prepared from (3-5) by weight: (1-3): (1-2): 1, aluminum nitride, silicon carbide, magnesium oxide and fibrous high-heat-conductivity carbon powder.
4. The geothermal energy heat exchange tunnel system with high thermal conductivity according to claim 1, wherein: the phase change energy storage layer (5) is prepared from (2-3): 1 and the phase-change material, and the void ratio of the phase-change energy storage layer (5) is 20-25%.
5. The construction method of the high-thermal-conductivity geothermal energy heat exchange tunnel system according to claim 1, comprising the steps of:
A. embedding a heat exchange tube (301) and high heat conduction filler (302) in the geotextile bag;
B. excavating a tunnel, constructing a tunnel invert (2), and laying a geotextile bag on the upper surface of the tunnel invert (2) to form a patch type prefabricated geotextile bag heat exchange layer (3);
C. a lower waterproof layer (4), a phase change energy storage layer (5), an upper waterproof layer (6) and a heat insulation layer (7) are sequentially laid above a patch type prefabricated geotextile bag heat exchange layer (3) on an inverted arch (2) of a tunnel and compacted, wherein the phase change energy storage layer (5) is sealed after two sides of the upper waterproof layer (6) and two sides of the lower waterproof layer (4) are in sealed lap joint at two side parts of the tunnel;
D. a water inlet and a water outlet of a heat exchange tube (301) in the patch type prefabricated geotextile bag heat exchange layer (3) penetrate out of the upper waterproof layer (6) and the heat insulation layer (7) upwards, and sealing treatment is carried out;
E. a pavement layer (8) is laid on the heat insulation layer (7), a water pipe ditch (9) is reserved on the side of the pavement layer (8), a water supply pipe (10) and a water return pipe (11) are arranged in the water pipe ditch (9), and then the water supply pipe (10) is communicated with a water inlet of the heat exchange pipe (301) and the water return pipe (11) is communicated with a water outlet of the heat exchange pipe (301).
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| CN111794801A (en) * | 2020-08-13 | 2020-10-20 | 成都鑫筑博建材有限公司 | Tunnel heat preservation ditch heating system of ground source heat pump |
| CN112414194B (en) * | 2020-11-23 | 2023-02-03 | 青岛理工大学 | Equipment module, system and method for treating underground space thermal pollution |
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| CN101672189B (en) * | 2009-09-23 | 2012-01-25 | 同济大学 | Ground source heat pump type heating system used for heat insulating ditch in tunnel |
| CN101985882B (en) * | 2010-08-10 | 2012-07-04 | 中铁二十局集团有限公司 | Construction method of rigid primary support of mould-building concrete of plateau permafrost tunnel |
| FR2974888A1 (en) * | 2011-05-05 | 2012-11-09 | 2F2C | Geothermal system for frost protection of ground surface e.g. airport runway, has closed hydraulic circuit including fluid that is movable under effect of temperature variation outside system, where fluid is confined under pressure |
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| CN107860144B (en) * | 2017-12-29 | 2019-10-08 | 湖南中大经纬地热开发科技有限公司 | The heat-exchange system that can for tunnel develop |
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