CN115013995A - Novel middle-deep buried pipe heat exchanger - Google Patents
Novel middle-deep buried pipe heat exchanger Download PDFInfo
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- CN115013995A CN115013995A CN202111591144.5A CN202111591144A CN115013995A CN 115013995 A CN115013995 A CN 115013995A CN 202111591144 A CN202111591144 A CN 202111591144A CN 115013995 A CN115013995 A CN 115013995A
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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
- 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
- F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
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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
The invention discloses a novel medium-deep buried pipe heat exchanger which comprises a heat exchanger body, wherein rock-soil body temperature is sequentially divided into a temperature changing layer, an isothermal layer and a temperature increasing layer from top to bottom according to temperature distribution in the depth direction of drilling, and the heat exchanger body is sequentially communicated with a straight pipe section, a single spiral section and a double spiral section from top to bottom; the straight pipe section, the single-spiral section and the double-spiral section are respectively provided with a water inlet pipe and a water outlet pipe, the water inlet pipe of the straight pipe section, the water inlet pipe of the single-spiral section and the water inlet pipe of the double-spiral section are sequentially communicated, and the water outlet pipe of the straight pipe section, the water outlet pipe of the single-spiral section and the water outlet pipe of the double-spiral section are sequentially communicated; the bottom of the double-spiral-section water inlet pipe is communicated with the bottom of the double-spiral-section water outlet pipe; the straight pipe section, the single-spiral section and the double-spiral section are naturally combined into an integral heat exchange structure by adopting a hollow triangular support, a support rod and a hollow guide mounting head. The invention has the outstanding advantages of high heat exchange efficiency, strong bearing capacity, less heat loss, high construction quality and the like.
Description
Technical Field
The invention belongs to the technical field of buried pipe heat exchangers, and particularly relates to a novel middle-deep buried pipe heat exchanger.
Background
With the continuous promotion of energy conservation and emission reduction and the proposal of targets, a vertical buried pipe heat pump system receives more and more attention, at present, the vertical buried pipe heat pump system can be divided into a shallow buried pipe heat pump system with the drilling depth generally between 50 and 200 meters and a middle-deep buried pipe heat pump system with the drilling depth generally between 1000 and 3000 meters, but no matter the shallow buried pipe heat pump system or the middle-deep buried pipe heat pump system, a buried pipe heat exchanger is a key component of the system, and the initial investment and the system efficiency of the system are directly determined by the level of the heat exchange efficiency. In order to improve the efficiency of the ground heat exchanger, various ground heat exchanger structural forms are provided and researched by a plurality of researchers, the structural forms of common shallow ground heat exchangers include a single U type, a double U type and a W type, and a newly proposed spiral type, and the research of the structural forms greatly promotes the development and the application of a shallow ground heat exchanger system. Although the shallow buried pipe heat exchange technology is relatively early in development and relatively mature in technology, in order to better realize the early realization of the aims of cleaning and heating and promoting double carbon, the middle-deep buried pipe heat pump system has the unique advantages of small occupied area, high and stable heat output, no influence of outdoor climate, no phenomenon of cold and heat imbalance of the shallow buried pipe and the like, so the middle-deep buried pipe heat exchange system is particularly favored by people in recent years, and the structure and the thermal performance of the buried pipe heat exchanger become the hot point of research of people.
The buried pipe heat exchanger of the middle-deep layer belongs to the novel technology, the structure is more single at present, mainly for double pipe heat exchanger, the inside/outside pipe of double pipe heat exchanger all adopts the steel pipe originally, but has serious confession, the hot short circuit phenomenon of return water, therefore the outer pipe of present middle-deep layer double pipe heat exchanger generally adopts the steel pipe, and the inner tube generally adopts the plastic tubing, has slowed down the hot short circuit phenomenon to a certain extent, still has obvious not enough: the sleeve type ground heat exchanger has the advantages that only the outer pipe wall is in full contact with the rock-soil body for heat exchange, the pipe diameter is large, the pipe wall thickness is large, the whole water outlet pipe cannot exchange heat with the rock-soil body, heat can be transferred to the water inlet pipe, and a thermal short circuit is still obvious; compared with the existing shallow-layer buried pipe heat exchanger, the double-pipe heat exchanger is generally larger in outer diameter, although the heat exchange between the water inlet pipe and the rock-soil body can be increased, the heat dissipation of the initial pipe well section drilled in the middle and deep layer to the rock-soil body is increased, namely the heat loss is increased. Although the utility model patent (CN 212299509U) improves the sleeve-type heat exchanger of the middle-deep buried pipe, the flow speed of water entering the annular flow channel and the bending deformation resistance of the outer pipe are improved, the heat exchange between the inner pipe and the flow speed is improved while the heat exchange between the inner pipe and the rock-soil body is enhanced, namely the thermal short circuit is also enhanced; furthermore, the existing shallow-layer ground heat exchanger structure cannot be well applied to the middle and deep layers.
Whether the single U type, double U type, W type and novel spiral type (CN 111536810B) of the shallow buried pipe heat exchanger or the sleeve type intermediate-deep buried pipe heat exchanger, the structural form is an axisymmetric structure, and the inherent defects are as follows: while the heat transfer is enhanced by enlarging the heat exchange area, the thermal short circuit and the heat loss are increased, and for the heat exchanger of the buried pipe in the middle and deep layer, the defects of the inherent structure are more prominent.
Therefore, the structure of the buried pipe heat exchanger in the middle and deep layers needs to be innovated, and only then, the heat exchange efficiency of the buried pipe heat exchanger can be improved to the maximum extent, the energy output of a drilling pipe well is enhanced, the number of drilled wells is reduced, and the initial investment and the occupied area are reduced. In order to further promote energy conservation and emission reduction and promote the early realization of the double-carbon target, the heat exchanger of the buried pipe in the middle and deep layer is provided.
In conclusion, the structural design of the existing buried pipe heat exchanger cannot be well adapted to the temperature distribution of the drill hole, the effective utilization rate of the drilling depth is not high, and the heat exchanger of the buried pipe in the middle-deep layer has obvious phenomena of thermal short circuit and heat loss. Aiming at the defects of the existing buried pipe heat exchanger, the novel middle-deep buried pipe heat exchanger is creatively provided based on the heat transfer strengthening principle according to the vertical temperature distribution and the heat transfer process analysis of a drilling well, and has the outstanding advantages of high heat exchange efficiency, less heat loss, strong bearing capacity, high construction quality and the like.
Disclosure of Invention
The invention provides a novel heat exchanger for a buried pipe in a middle and deep layer, wherein different heat exchanger structures are adopted at different depth sections of a drilling well, and the heat exchange structures are sequentially a straight pipe section, a single spiral section and a double spiral section along the depth direction of the drilling well. The straight pipe section is provided with 3 water inlet straight pipes and 3 water outlet straight pipes, on the same horizontal plane, 3 water outlet pipes are positioned at 3 vertexes of the equilateral triangle, namely, the water inlet pipes are uniformly distributed on the circumcircle of the equilateral triangle, and 3 water inlet pipes are positioned at the middle points of 3 sides of the equilateral triangle, namely, the water inlet pipes are uniformly distributed on the inscribed circle of the equilateral triangle; in the single spiral section, the water outlet pipe is a straight pipe, the water inlet pipe is a spiral pipe, and the water outlet pipe is positioned on the outer side of the spiral pipe; in the double-helix section, the water inlet pipe and the water outlet pipe are both helical pipes, the water inlet pipe is an inner helix, and the water outlet pipe is a coaxial outer helix; the pipe centers of the water inlet pipe and the water outlet pipe are positioned on the concentric rings with different radiuses; the water inlet pipe and the water outlet pipe are communicated by a U-shaped bent pipe at the bottom of the double-spiral section. The water outlet pipe positioned at the vertex of the equilateral triangle is connected with the water inlet pipe at the middle point of the opposite edge, and a hollow guide mounting head is arranged at the U-shaped bend; in order to ensure the installation quality of the heat exchanger, a hollow triangle is adopted for fixing the tube pitch, a hollow triangle and a supporting rod are adopted for fixing the thread pitch, and a hollow guide installation head is adopted for protecting a U-shaped bent tube, so that the installation resistance is reduced.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a novel middle and deep buried pipe heat exchanger, includes the heat exchanger body, the heat exchanger body is straight tube section, single spiral section and the double helix section that from top to bottom communicates in proper order. The water inlet pipe is a straight pipe, a spiral pipe and a spiral pipe from top to bottom along the pipe well, and the water inlet straight pipe, the water inlet spiral pipe and the water outlet spiral pipe are communicated in sequence; the water outlet pipe is sequentially provided with a water outlet spiral pipe, a water outlet straight pipe, a water outlet spiral pipe, a middle water outlet straight pipe and an upper water outlet straight pipe from bottom to top along the pipe well; the water inlet pipe and the water outlet pipe are communicated at the bottom of the double-spiral section through a U-shaped bent pipe, and the water outlet pipe corresponding to the vertex of the triangle is communicated with the water inlet pipe corresponding to the center position of the opposite side of the vertex.
In the novel middle-deep buried pipe heat exchanger, the straight pipe section, the single-spiral section and the double-spiral section are respectively provided with three water inlet pipes and three water outlet pipes, the three water outlet pipes of the straight pipe section, the single-spiral section and the double-spiral section are respectively arranged on an external circle where three vertexes A, B, C of the triangle are located, and the three water inlet pipes are respectively arranged on an inscribed circle where midpoints D, E, F of three sides of the triangle are located; for convenience of description, point D is set as the midpoint of the corresponding side of the vertex A, namely D is the midpoint of the connecting line of the vertices B and C; e is the midpoint of the corresponding side of the vertex B, namely E is the midpoint of the connecting line of the vertices A and C; f is the midpoint of the corresponding edge of the vertex C, i.e. F is the midpoint of the connection line between the vertices A and B. Wherein each water inlet pipe located at the middle point of the corresponding side of the vertex of the triangle flows into the bottom of the pipe well after flowing through the straight pipe section, the single spiral section and the double spiral section, flows into the water outlet pipe located at the corresponding vertex through the U-shaped bent pipe, then sequentially flows through the outer spiral pipes in the double spiral section, and the water outlet straight pipe in the single spiral section and the water outlet straight pipe on the outer ring in the straight pipe section flow out.
In the double-spiral section, the horizontal projection of the outer spiral pipe of the effluent is positioned on the circular ring where the vertex A, B, C is positioned; the pipe center of the water outlet straight pipe in the single spiral section and the pipe center of the water outlet straight pipe in the straight pipe section are positioned at the top point A, B, C of the equilateral triangle. The pipe center of the water inlet pipe of the straight pipe section is positioned at the midpoint D, E, F of the three sides in the equilateral triangle; in the single spiral section, the water inlet pipe is a spiral pipe, and the horizontal projection of the pipe center of the water inlet spiral pipe section is positioned on the inscribed circle of the equilateral triangle ABC where the water outlet straight pipe section is positioned; in the double-spiral section, the water inlet pipe is an inner spiral pipe, and the horizontal projection of the pipe center of the water inlet spiral pipe in the section is still positioned on the inscribed circle of the equilateral triangle ABC. The water inlet pipes, the water outlet pipes and the water inlet and outlet pipes are not in direct contact, and the horizontal distance from the water outlet pipe center to the shaft center of the pipe well is twice as long as the horizontal distance from the water inlet pipe center to the shaft center of the pipe well.
The heating medium flows in from the water inlet pipe corresponding to the middle point of the opposite side opposite to the vertex, sequentially flows through the water inlet straight pipe of the straight pipe section, the water inlet spiral pipe of the single spiral section and the water inlet spiral pipe of the double spiral section, then flows into the water outlet pipe after passing through the U-shaped bent pipe, sequentially passes through the water outlet spiral pipe of the double spiral section and the water outlet straight pipe of the single spiral section, and finally is discharged by the water outlet straight pipe in the straight pipe section. The heating medium flows in from the water inlet pipe corresponding to the position D, turns back through the U-shaped bent pipe after passing through the straight pipe section, the single spiral section and the double spiral section, then sequentially flows through the double spiral section, and flows out from the water outlet pipe corresponding to the position A after passing through the single spiral section and the straight pipe section; the heating medium flows through the water inlet pipe corresponding to the position E, the straight pipe section, the single spiral section and the double spiral section, then turns back through the U-shaped bent pipe, then flows through the double spiral section, the single spiral section and the straight pipe section in sequence, and finally flows out of the water outlet pipe corresponding to the position B; the inlet tube that F position corresponds is through two spiral sections, single spiral section and straight tube section back, turns back through U type return bend, then flows through two spiral sections in proper order, single spiral section and straight tube section, flows out from the outlet pipe that C position corresponds at last.
Above-mentioned novel well deep ground heat exchanger, the outlet pipe of single spiral section is the straight tube, and the outlet pipe is on triangular circumscribed circle, and the inlet tube is the spiral pipe, and the spiral pipe is managed all on triangular inscribed circle.
Above-mentioned novel middle-deep ground heat exchanger, the inlet tube and the outlet pipe of double helix section are the spiral pipe, and the spiral pipe of inlet tube is on triangle-shaped inscribe circle, and the spiral pipe of outlet pipe is on triangle-shaped's circumcircle.
The novel middle-deep buried pipe heat exchanger further comprises a hollow triangular support, through holes are formed in the positions of the vertex A, B, C of the triangular support and the middle point D, E, F of the three edges, three water outlet pipes of the straight pipe section, the single-spiral section and the double-spiral section are equally sleeved in the through holes in the positions corresponding to the three vertexes A, B, C of the triangular support respectively, and three water inlet pipes are sleeved in the through holes in the positions corresponding to the middle points D, E, F of the three edges of the triangle respectively.
The novel medium-deep buried pipe heat exchanger further comprises a support rod. For the metal pipe, no supporting rod is arranged between the two hollow triangular supports in the straight pipe section part; three supporting rods are arranged between the two hollow triangular supports in the single spiral section; in the double-helix section, three supporting rods are arranged between the two hollow triangular supports, and the supporting rods are arranged on the outer sides of the water inlet pipe and the water outlet pipe. For the plastic pipe, a support rod is not arranged between the two hollow triangular supports at the straight pipe section part; three support rods are arranged between the two hollow triangular supports in the single-spiral section and are positioned on the outer side of the water inlet spiral pipe and the inner side of the water outlet straight pipe; at the double helix section, set up six support rods between two cavity triangle-shaped supports, three settings are in the outside of outer spiral pipe, three settings are in the inboard of outer spiral and the outside of interior spiral.
In the novel middle-deep buried pipe heat exchanger, the upper triangular bracket and the lower triangular bracket which correspond to the spiral pipe are connected through the supporting rod so as to keep the screw pitch of the water inlet pipe and the water outlet pipe not to be damaged when the water inlet pipe and the water outlet pipe adopt metal pipes (such as common steel pipes, galvanized steel pipes, stainless steel pipes and the like); if advance, when the outlet pipe adopted non-metallic pipe (for example pipes such as plastic tubing PB, PE), then need transversely set up the fixed pipe strap of a plurality of spiral pipes on the supporting rod, fix the pipe strap joint on the spiral pipe with the spiral pipe to fixed plastic tubing fixes its spiral, guarantees that its pitch is not destroyed when the installation. The structure is also suitable for the shallow buried pipe heat exchanger.
Above-mentioned novel middle deep ground heat exchanger is provided with fretwork direction installation head bottom two spiral pipes, and in two spiral section bottoms, the U type connecting pipe of connecting inlet tube and outlet pipe all establishes in fretwork direction installation head. The upper part of the hollow guide mounting head is hemispherical, the lower part of the hollow guide mounting head is conical, and water drop-shaped hollows are uniformly distributed on the guide mounting head.
In the novel medium-deep buried pipe heat exchanger, the water inlet pipe corresponding to the position D of the double-spiral section is communicated with the water outlet pipe corresponding to the position A through the U-shaped bent pipe; the water inlet pipe corresponding to the position E is communicated with the water outlet pipe corresponding to the position B through the U-shaped bent pipe; and the water inlet pipe corresponding to the position F is communicated with the water outlet pipe corresponding to the position C through the U-shaped bent pipe.
The novel middle-deep buried pipe heat exchanger is characterized in that the heat insulation layer is sleeved outside the water outlet pipe of the straight pipe section.
Compared with the prior art, the invention has the following beneficial technical effects:
on the basis of fully considering the vertical temperature distribution and the transverse heat transfer process of the rock-soil body layer in the drilling depth direction, the temperature is increased along with the increase of the depth in the longitudinal direction, the effective heat exchange area of the heat absorption section of the rock-soil body of the lower drilling is increased, the heat exchange area of the drilling section of the upper drilling is reduced, and therefore the heat loss can be reduced, the heat exchange efficiency of the buried pipe heat exchanger can be improved, and the effective utilization rate of drilling can be improved; in the transverse direction, the water inlet pipe is arranged in the inner ring, the water outlet pipe is arranged in the outer ring, and the water inlet pipe and the water outlet pipe are subjected to countercurrent heat exchange with the transverse heat transfer process in a macroscopic view, so that the heat exchange temperature difference is increased, the heat exchange efficiency of the high-temperature section of the rock-soil mass at the lower part of the well drilling can be improved, and the heat dissipation loss to the rock-soil mass at the upper part of the well drilling is reduced; compared with the existing middle-deep-layer sleeve type buried pipe heat exchanger, the novel middle-deep-layer sleeve type buried pipe heat exchanger has small heat transfer resistance and high heat transfer rate under the same drilling well; the water inlet pipe and the water outlet pipe have small pipe diameters and strong bearing capacity. To sum up, the novel middle-deep buried pipe heat exchanger has the outstanding advantages of high heat exchange efficiency, strong bearing capacity, less heat loss, high construction quality and the like.
Drawings
Figure 1 is a schematic view of the ground heat exchanger configuration of the present invention.
Figure 2 is a plan view of a borehole heat exchanger construction according to the present invention.
FIG. 3 is a schematic view of the present invention with the addition of a helical tube retainer clip.
FIG. 4 is a schematic structural diagram of the hollow guide mounting head of the present invention.
Wherein: 1, hollowing out a guide mounting head; 2 supporting the rod; 3, a water outlet spiral pipe; 4, a triangular bracket; 5a water inlet spiral pipe; 5b, a water inlet spiral pipe and 6, 8 and 12 water inlet pipes; 7, 9 and 11 water outlet pipes; the 10 triangle is hollow; 14 hole well walls; 15 an insulating layer; 16, fixing a pipe clamp by using a spiral pipe; 17, guiding the mounting head to be hollowed; l1 double helix segment; l2 single helical segment; l3 double straight tube sections.
Detailed Description
The following are detailed procedures for carrying out the present invention.
As shown in fig. 1, 2 and 3, the novel medium-deep buried pipe heat exchanger comprises a heat exchanger body, wherein according to the temperature distribution in the drilling depth direction, the temperature of a rock-soil body is divided into a temperature-variable layer, an isothermal layer and a temperature-increasing layer from top to bottom in sequence, and most parts of the heat exchanger body are positioned in the temperature-increasing layer. Specifically, the method comprises the following steps: the heat exchanger body is composed of a straight pipe section L3, a single spiral section L2 and a double spiral section L1 which are sequentially communicated from top to bottom, the length of the straight pipe section L3 is determined according to the design inlet temperature of a heat medium and a drilling rock-soil thermal response experiment, if the design temperature of a heat medium inlet is low, the straight pipe section is generally in a temperature changing layer, and if the temperature of the inlet heat medium is high, the straight pipe section is in the temperature changing layer and an isothermal layer. The length of the double spiral section L1 is determined by the heat medium outlet temperature and the thermal response experiment of the drilling rock soil, and is generally positioned at the lower part of the temperature-increasing layer, and the length of the single spiral section depends on the total drilling depth and the lengths of the straight pipe section L3 and the double spiral section L2, namely the length is equal to the total drilling length minus the lengths of L2 and L3 respectively.
A water inlet pipe and a water outlet pipe are respectively arranged in the straight pipe section L3, the single spiral section L2 and the double spiral section L1, the water inlet pipe of the straight pipe section L3, the water inlet pipe of the single spiral section L2 and the water inlet pipe of the double spiral section L1 are sequentially communicated, and the water outlet pipe of the straight pipe section L3, the water outlet pipe of the single spiral section L2 and the water outlet pipe of the double spiral section L1 are sequentially communicated; at the bottom of the double-spiral section L1, the water inlet pipe is communicated with the water outlet pipe through a U-shaped bent pipe, and the water outlet pipe at the vertex of the equilateral triangle is communicated with the water inlet pipe at the midpoint of the opposite side of the vertex.
Based on heat transfer enhancement mechanism and heat transfer process thermal resistance analysis, different buried pipe heat exchange structures are adopted in different drilling sections of the same drilling well by combining the temperature distribution of rock and soil mass in the drilling depth direction, and the areas of the heat exchangers are sequentially increased along the drilling depth direction. In winter, the temperature of the rock-soil mass rises along with the increase of the well depth, and different heat exchange structural forms are adopted, so that the heat loss can be reduced, and the heat exchange efficiency can be improved. Compared with a double-spiral structure, the double-spiral structure can save pipes and reduce heat loss. The heat exchange efficiency with the rock-soil body can be improved by increasing the heat exchange area along the drilling depth direction, or the drilling depth can be reduced under the condition of the same heat demand.
As shown in fig. 1, 2 and 3, the straight pipe section L3, the single spiral section L2 and the double spiral section L1 are provided with three water inlet pipes 6, 8 and 12 and three water outlet pipes 7, 9 and 11, the three water outlet pipes of the straight pipe section L3, the single spiral section L2 and the double spiral section L1 are respectively arranged on a circumscribed circle corresponding to three vertexes A, B, C of an equilateral triangle, and the three water inlet pipes are respectively arranged on an inscribed circle corresponding to a midpoint D, E, F of three sides of the equilateral triangle.
The low-temperature heating medium from the heat exchanger flows into 3 water inlet straight pipes positioned at the middle points of three sides of an equilateral triangle in the straight pipe section L3 through the water outlet horizontal collecting pipe in a shunting manner, then flows into the spiral pipe in the single spiral section L2 in sequence to absorb the heat of the rock-soil body, the temperature of the water inlet pipe is increased, the low-temperature heating medium flows into the inner spiral pipe in the double spiral section after the temperature of the water inlet pipe is increased, the heat of the rock-soil body is continuously absorbed in the pipe section to further increase the temperature of the water inlet pipe, finally flows into the outer spiral pipe of the double spiral section L1 through the U-shaped connecting pipe at the bottom of the double spiral section L1, the heat of the rock-soil body is continuously absorbed in the outer spiral pipe to further increase the temperature of the water outlet pipe, then flows through the 3 water outlet straight pipes positioned at the vertexes of the equilateral triangle in the single spiral section L2 and the straight pipe section L3, finally is collected in the water outlet horizontal collecting pipe, flows into the heat exchanger through the water outlet horizontal collecting pipe to perform heat exchange and temperature reduction, and then flows into the water inlet horizontal collecting pipe, then the water is shunted to enter a water inlet straight pipe of the straight pipe section L3 to complete the heat exchange circulation.
The projection of 3 water outlet pipes of the straight pipe section L3 is positioned on the vertex of the equilateral triangle, namely the circumcircle of the equilateral triangle, the 3 water inlet pipes are positioned on the midpoint of the equilateral triangle, namely the inscribed circle of the equilateral triangle, 6 pipelines can be fixed by the same equilateral triangle, the pipe spacing and the uniform distribution of the water inlet pipe and the water outlet pipe in the well drilling are ensured, meanwhile, the water outlet pipes and the water inlet pipe and the water outlet pipes in the well drilling are easily distinguished, and the connection between the water inlet pipe and the water outlet pipes and the horizontal collecting pipe in the well drilling is facilitated. The temperature of rock-soil body is lower in the straight tube section L3 relatively, advances, the outlet pipe mainly plays the transport effect, and the heat transfer area of this section advance, the outlet pipe is reduced as far as possible, reduces advance, the outlet pipe dispels the heat to the rock-soil body: because the temperature of outlet pipe is higher, and the temperature difference of outlet pipe and ground body is great, for the heat dissipation of further reducing the outlet pipe, to the outlet pipe in alignment section L3 set up heat preservation 15, and the inlet tube is less with the temperature difference of ground body, and the inlet tube is very few to the heat dissipation of ground body, and through technical and economic analysis, the inlet tube in the straight tube section does not keep warm. The structural design can reduce the heat loss of the ground heat exchanger under the condition of saving investment. In the straight pipe section L1 of the invention, the water inlet pipe is the position D, E, F of the middle point of the three sides of the equilateral triangle respectively for the straight pipes 6, 8 and 10, the temperature of the water inlet pipe is generally slightly larger than the temperature of the rock-soil body in the straight pipe section L3, but the temperature difference with the rock-soil body is not large, the heat loss of the water inlet pipe in the section is negligible, so the outside of the water inlet straight pipe of the pipe section is not sleeved with the heat-insulating layer. When the heat medium flows downstream along the water inlet straight pipe, the temperature of the rock-soil mass outside the pipe is gradually increased, when the temperature of the rock-soil mass is higher than the temperature of the heat medium in the water inlet straight pipe, (for example, when the temperature of the rock-soil mass is higher than the temperature of the heat medium by 3 ℃), the water inlet straight pipe is changed into a spiral pipe, the water inlet pipe is always the spiral pipe until the bottom of a well drilling well, the heat of the rock-soil mass is continuously absorbed in the flow of the spiral pipe from top to bottom, the temperature of the water inlet pipe is continuously increased, when the bottom of the double-spiral section of the heat medium flow channel is arranged at the bottom of the double-spiral section, the heat medium enters the outer spiral water outlet pipe in the double-spiral section L1 through the U-shaped bent pipe at the bottom, and the heat medium is continuously heated by the rock-soil mass in the outer spiral water outlet pipe. The inlet tube adopts the heat transfer area between spiral pipe increase inlet tube and the ground body, and then strengthens the heat transfer of inlet tube and ground body, and then improves the heat exchange efficiency of well drilling.
In the double-spiral section L1 of the invention, the water outlet pipe is an external spiral pipe. The heat medium passes through the U-shaped bent pipe, flows into the water outlet spiral pipe 3 through the water inlet spiral pipe 5b, and along with the heat medium flowing from bottom to top in the water outlet spiral pipe, the temperature of the rock-soil body is gradually reduced, the temperature of the heat medium is gradually increased, the temperature difference between the rock-soil body and the heat medium is gradually smaller, and when the temperature difference is reduced to a certain degree (for example, when the temperature of the rock-soil body and the temperature of the heat medium are less than 3-4 ℃), the water outlet spiral pipe is changed into a straight pipe. In the double helix section, the rock-soil body temperature is obviously higher than the temperature of outlet pipe, in order to further absorb the heat in the rock-soil body, needs to increase the heat transfer area of outlet pipe, so the outlet pipe is established to the spiral pipe, improves the heat transfer efficiency of well drilling. In the single spiral section, the temperature difference between the temperature of the water outlet pipe and the temperature of the rock-soil body of the pipe section is small, and for reducing the circulating resistance and saving pipes, the water outlet pipe is arranged to be a straight pipe in the single spiral section L2, the temperature difference between the water outlet pipe and the rock-soil body is not large, and the heat exchange area is small, so that the heat exchange quantity between the water outlet pipe and the rock-soil body is extremely small, and a heat insulation layer does not need to be laid outside the water outlet pipe of the pipe section. In the straight pipe section L3, the straight outlet pipes 9, 11 and 7 are respectively located at the A, B and C vertexes of the equilateral triangle, the temperature of the outlet pipe is obviously higher than that of the rock-soil body, although the outlet pipe is still a straight pipe section, the heat exchange area is small, the heat loss cannot be ignored due to large temperature difference, through the technical and economic comparison, the heat insulation layer 15 is suitable to be sleeved outside the outlet pipe, the heat loss of the outlet pipe can be obviously reduced, and the temperature of the outlet pipe is ensured. The structural design can improve the effective utilization rate of the drilling depth and reduce the heat loss at the same time.
In the ground heat exchanger of the invention, the well section of the pipe with the water inlet pipe being the spiral pipe 5a and the water outlet pipe being the straight pipe section is called as a single spiral section L2; the well section of the pipe with the water inlet pipe and the water outlet pipe both being spiral pipes is called a double-spiral pipe section L1, and the well section of the pipe with the water inlet pipe and the water outlet pipe both being straight pipes is called a straight pipe section L3. The length of the straight pipe section L3 depends on the water inlet temperature and the rock-soil body temperature; the length of the double spiral pipe section L1 depends on the temperature of the water outlet pipe and the temperature of rock-soil mass. The water inlet pipe in the double spiral section L1 is an inner spiral pipe 5 b. In the double spiral section, heat from rock mass is firstly transferred to the water outlet spiral pipe 3 in the section L1 and then transferred to the inner spiral water inlet pipe 5 b. The inner and outer double spiral pipes are adopted, the outer spiral is a water outlet pipe, the inner spiral is a water inlet pipe, and the mode of transverse heat transfer with the rock-soil body in a countercurrent mode can enhance heat exchange with the rock-soil body and further improve the temperature of the water outlet pipe.
The water inlet pipe 5b and the water outlet pipe 3 of the double-spiral section L1 are both spiral pipes, the water inlet pipe is an inner spiral pipe 5b, the spiral pipe of the water inlet pipe is positioned on the inscribed circle of an equilateral triangle, the water outlet pipe is an outer spiral pipe, the water outlet spiral pipe is positioned on the circumscribed circle of the equilateral triangle, the inner spiral pipe and the outer spiral pipe are concentric spiral pipes, and the radius of the outer spiral pipe is 2 times that of the inner spiral pipe.
The novel medium-deep buried pipe heat exchanger has the advantages that the temperature of the rock-soil mass of the double-spiral section at the bottom of the heat exchanger is higher than that of the water inlet pipe and the water outlet pipe, the water inlet pipe and the water outlet pipe are both arranged into spiral pipes in order to utilize the heat of the rock-soil mass of the well section of the pipe to the maximum, and the heat exchange area is further increased so as to improve the utilization rate of the heat of the rock-soil mass. The water inlet and outlet spiral pipe is arranged on the inner ring, the water outlet spiral pipe is arranged on the outer ring, the water outlet pipe is positioned at a relatively high temperature position in the transverse heat transfer process, the water inlet pipe is positioned at a relatively low temperature position in the transverse heat transfer process, and the ground heat exchanger and the rock-soil body are subjected to countercurrent heat exchange macroscopically, so that the heat exchange temperature difference can be increased, and the heat exchange efficiency is further improved
In the initial section of drilling, the water inlet pipe and the water outlet pipe adopt straight pipe sections, so that the heat exchange area is reduced, and the heat loss can be reduced. The water inlet pipe and the water outlet pipe are not in direct contact, so that the thermal short circuit of the double-pipe heat exchanger can be effectively avoided. In addition, the lengths of the straight pipe section L3, the single spiral section L2 and the double spiral section L1 of the invention are determined according to a drilling response experiment, a theoretical analysis and a numerical simulation experiment, and depend on the characteristics of rock and soil mass, the height of local water level and the like.
As shown in fig. 1 and 3, the novel mid-deep buried pipe heat exchanger further comprises a hollow triangular support 10, through holes are formed in positions D, E, F corresponding to a vertex A, B, C of the triangular support and three sides of the triangular support, three water outlet pipes of the straight pipe section L3, the single spiral section L2 and the double spiral section L1 are respectively sleeved in the through holes corresponding to the three vertices A, B, C of the triangular support, and three water inlet pipes are respectively sleeved in the through holes corresponding to the midpoints D, E, F of the three sides of the triangle. The upper triangular support 10 and the lower triangular support 10 corresponding to the spiral pipes are connected through a supporting rod 2, a plurality of spiral pipe fixing pipe clamps 16 are transversely arranged on the supporting rod, and the spiral pipe fixing pipe clamps are clamped on the spiral pipes. The novel middle-deep buried pipe heat exchanger is internally provided with the horizontal triangular support, so that not only can the heat exchange structures of different drilling sections naturally form a whole, but also the pipe spacing between the buried pipes can be fixed, and simultaneously, the water inlet pipe and the water outlet pipe can be conveniently distinguished, and further, the construction quality can be improved; the supporting rods are arranged between the hollow triangular supports and used for keeping the thread pitch of the water inlet and outlet spiral pipes from deforming during installation, and the defect that the pipe spacing and the thread pitch are not easy to guarantee during installation of the shallow buried pipe heat exchanger is overcome. The novel middle-deep buried pipe heat exchanger has the advantages that the guide mounting head is hollow, the triangular support is hollow, and the helix and the drilling are coaxial, so that the existing construction technology can be guaranteed to be still suitable; meanwhile, the back filling material can be conveniently flushed, so that the back filling material is tightly contacted with the pipe wall and the drilling wall 14, the contact thermal resistance is reduced, and the heat exchange efficiency of the buried pipe is further improved.
As shown in fig. 1, 2 and 3, in the novel mid-deep buried pipe heat exchanger, a water outlet pipe corresponding to the position a of the double-spiral section L1 is communicated with a water inlet pipe corresponding to the position D of the middle point of the opposite side of the position a through a U-shaped bent pipe; the water outlet pipe corresponding to the position B is communicated with the water inlet pipe corresponding to the midpoint E of the opposite side of the position B through the U-shaped bent pipe; and the water outlet pipe corresponding to the position C is communicated with the water inlet pipe corresponding to the middle point F of the opposite side of the position C through the U-shaped bent pipe. The bottom of the double spiral pipe is provided with a hollow guide mounting head, and U-shaped connecting pipes of a water inlet pipe and a water outlet pipe of the double spiral section L1 are arranged in the hollow guide mounting head 1.
The novel middle-deep buried pipe heat exchanger advances, the outlet pipe passes through bottom U type return bend intercommunication, and the outlet pipe that is located equilateral triangle summit is connected with the inlet tube to the edge punishment department, rather than being connected with nearest outlet pipe, can increase the bend radius of U type return bend like this, makes things convenient for the preparation of U type return bend.
As shown in fig. 4, the U-shaped elbow of the invention is provided with a hollow guiding installation head 1, so that the U-shaped elbow at the bottom can be protected on one hand, the installation is convenient on the other hand, and the U-shaped elbow is prevented from being damaged or deformed during the installation; the guide mounting head is provided with the hollow parts, so that backfill materials can be conveniently filled, and the construction quality can be effectively guaranteed by the measures.
Compared with the existing sleeve type buried pipe heat exchanger, the novel medium-deep buried pipe heat exchanger has the advantages that the pipe diameter of the water inlet pipe and the water outlet pipe of the novel medium-deep buried pipe heat exchanger is small, the flow speed is high, the pipe wall is thin, the heat transfer resistance is small, and the efficiency of the buried pipe heat exchanger can be further improved.
On the basis of fully considering the vertical temperature distribution and the transverse heat transfer process of the well drilling, the invention creatively utilizes the advantages of the 3U-shaped, spiral and sleeve type ground heat exchangers, overcomes the defects thereof and effectively avoids the occurrence of the thermal short circuit phenomenon. Along the longitudinal direction of the well drilling, along with the rise of temperature, the heat exchange area is increased, namely, the effective heat exchange area of the heat absorption section is increased, the ineffective heat exchange area of the heat dissipation section is reduced, the heat loss can be reduced, and the heat exchange efficiency and the effective utilization rate of the well drilling can be improved; in the transverse direction, the water inlet pipe is arranged in the inner ring, the water outlet pipe is arranged in the outer ring, and the water inlet pipe and the water outlet pipe are subjected to countercurrent heat exchange with the transverse heat transfer process in a macroscopic view, so that the heat exchange efficiency can be further improved; compared with the existing middle-deep sleeve type ground heat exchanger, the novel middle-deep sleeve type ground heat exchanger has small heat transfer resistance and high heat transfer rate under the same drilling; the water inlet and outlet pipes have small pipe diameter and strong bearing capacity. To sum up, the novel middle-deep buried pipe heat exchanger has the outstanding advantages of high heat exchange efficiency, strong bearing capacity, less heat loss, high construction quality and the like.
Technical means disclosed in the technical solution of the present invention are not limited to the technical means disclosed in the above embodiments, and include technical solutions formed by arbitrary combinations of the above technical features. It should be noted that modifications and adaptations can be made by those skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (10)
1. The utility model provides a novel well deep layer ground heat exchanger, includes the heat exchanger body, its characterized in that: the heat exchanger body consists of a straight pipe section, a single spiral section and a double spiral section which are sequentially communicated from top to bottom, wherein the straight pipe section, the single spiral section and the double spiral section are respectively provided with a water inlet pipe and a water outlet pipe; the bottom of the double-spiral section water inlet pipe is communicated with the bottom of the double-spiral section water outlet pipe.
2. A novel mid-depth buried heat exchanger according to claim 1, wherein: the straight pipe section, the single spiral section and the double spiral section are respectively provided with three water inlet pipes and three water outlet pipes, the three water outlet pipes of the straight pipe section, the single spiral section and the double spiral section are respectively arranged at positions corresponding to three vertexes A, B, C of the triangle, and the three water inlet pipes are respectively arranged at the positions of midpoints D, E, F of three sides of the triangle; the water inlet pipe corresponding to the middle point of each triangle three sides sequentially passes through the straight pipe section, the single spiral section and the double spiral section, and then sequentially passes through the double spiral section, the single spiral section and the straight pipe section of the water outlet pipe corresponding to the vertex position opposite to the side to be discharged.
3. A novel mid-depth buried heat exchanger according to claim 2, wherein: the water outlet pipe of the single spiral section is a straight pipe, the water outlet pipe is arranged on the outer circle of the triangle, the water inlet pipe is a spiral pipe, and the spiral pipe is arranged on the inner circle of the triangle.
4. A novel mid-depth buried heat exchanger according to claim 2, wherein: the water inlet pipe and the water outlet pipe of the double-spiral section are both spiral pipes, the spiral pipes of the water inlet pipe are arranged on the inner tangent circle of the triangle, and the spiral pipes of the water outlet pipe are arranged on the outer circumcircle of the triangle.
5. A novel mid-depth buried heat exchanger according to claim 2, wherein: the water outlet pipes of the straight pipe section, the single spiral section and the double spiral section are respectively sleeved in the through holes at the corresponding positions of the three vertexes A, B, C of the triangular support, and the three water inlet pipes are respectively sleeved in the through holes at the corresponding positions of the midpoints D, E, F of the three sides of the triangle.
6. A novel mid-depth buried heat exchanger according to claim 5, wherein: the upper triangular bracket and the lower triangular bracket which correspond to the single spiral section and the double spiral section are connected through a supporting rod; the supporting rod is transversely provided with a plurality of spiral pipe fixing pipe clamps which are clamped on the spiral pipes.
7. A novel mid-depth buried heat exchanger according to claim 6, wherein: in the single spiral section, a supporting rod is arranged between the upper triangular bracket and the lower triangular bracket which correspond to the spiral pipe and the straight pipe; in the double-helix section, an inner supporting rod is arranged between the corresponding upper triangular bracket and the corresponding lower triangular bracket between the inner helix tube and the outer helix tube, and an outer supporting rod is arranged outside the outer helix tube; the internal spiral pipe fixing pipe clamp for clamping the internal spiral pipe is arranged on the internal support rod, and the external spiral pipe fixing pipe clamp for clamping the external spiral pipe is arranged on the external support rod.
8. A novel mid-depth buried heat exchanger according to any one of claims 2 to 7, wherein: the hollow guide mounting heads are arranged at the bottoms of the double spiral pipes, and the water inlet pipe and the water outlet pipe at the bottom of the double spiral section are communicated and are arranged in the hollow guide mounting heads.
9. A novel mid-depth buried heat exchanger according to claim 8, wherein: the water outlet pipe corresponding to the position A at the bottom of the double helix section is communicated with the water inlet pipe corresponding to the position D of the middle point of the opposite side of the position A through the U-shaped bent pipe; the water outlet pipe corresponding to the position B is communicated with the water inlet pipe corresponding to the midpoint E of the opposite side of the position B through the U-shaped bent pipe; and the water outlet pipe corresponding to the C position is communicated with the water inlet pipe corresponding to the middle point F position of the opposite side of the C position through the U-shaped bent pipe.
10. A novel mid-depth buried heat exchanger according to claim 1, wherein: the water outlet pipe of the straight pipe section is sleeved with a heat-insulating layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111591144.5A CN115013995A (en) | 2021-12-23 | 2021-12-23 | Novel middle-deep buried pipe heat exchanger |
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| CN202111591144.5A CN115013995A (en) | 2021-12-23 | 2021-12-23 | Novel middle-deep buried pipe heat exchanger |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115854562A (en) * | 2023-02-13 | 2023-03-28 | 山东中科蓝天科技有限公司 | Corrosion-resistant heat-preservation energy-storage outdoor external pipe |
| WO2024096891A1 (en) * | 2022-11-01 | 2024-05-10 | Halliburton Energy Services, Inc. | Direct downhole electricity generation in a geothermal well |
-
2021
- 2021-12-23 CN CN202111591144.5A patent/CN115013995A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024096891A1 (en) * | 2022-11-01 | 2024-05-10 | Halliburton Energy Services, Inc. | Direct downhole electricity generation in a geothermal well |
| CN115854562A (en) * | 2023-02-13 | 2023-03-28 | 山东中科蓝天科技有限公司 | Corrosion-resistant heat-preservation energy-storage outdoor external pipe |
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