WO2018023900A1 - Échangeur de chaleur - Google Patents

Échangeur de chaleur Download PDF

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Publication number
WO2018023900A1
WO2018023900A1 PCT/CN2016/106923 CN2016106923W WO2018023900A1 WO 2018023900 A1 WO2018023900 A1 WO 2018023900A1 CN 2016106923 W CN2016106923 W CN 2016106923W WO 2018023900 A1 WO2018023900 A1 WO 2018023900A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
spiral
tube
exchanger according
wall
Prior art date
Application number
PCT/CN2016/106923
Other languages
English (en)
Chinese (zh)
Inventor
马明辉
Original Assignee
马明辉
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 马明辉 filed Critical 马明辉
Publication of WO2018023900A1 publication Critical patent/WO2018023900A1/fr

Links

Classifications

    • 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
    • F28D7/10—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 arranged one within the other, e.g. concentrically
    • F28D7/12—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 arranged one within the other, e.g. concentrically the surrounding tube being closed at one end, e.g. return type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
    • F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T2010/50—Component parts, details or accessories
    • 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

Definitions

  • the present disclosure relates to a heat exchanger, and more particularly to a heat exchanger for enhancing heat exchange efficiency in a medium-deep geothermal heat exchanger. Background technique
  • geothermal energy has become a clean energy that people are increasingly recognized as.
  • Geothermal heat is used to make use of geothermal heat.
  • the direct extraction of medium and deep underground hot water is not sustainable, because it will cause a certain degree of subsidence and land desertification due to the massive extraction of groundwater, which will make it difficult to restore ecological disasters.
  • geothermal heat in underground hot water is by drilling a deep well into the ground and then inserting a casing containing internal and external heat exchange tubes into the deep well.
  • the underground heat in the middle and deep layers will heat the outer tube.
  • a well-heated low-temperature circulating medium (for example, low-temperature water) is injected into the interlayer passage between the outer tube and the inner tube by the water pump, and the injected low-temperature circulating medium acquires the heat transferred from the outer tube wall during the downward flow. Thereby heating into a medium-high temperature circulating medium.
  • the high-temperature circulating medium is pumped to the ground under the action of the pump, so that the heat carried by the high-temperature circulating medium is used for various purposes, for example, it is widely used in industrial sectors such as chemical, petroleum, power and atomic energy to ensure The process requires specific temperatures for the media, floor heating, air conditioning heating or cooling, power generation, ground snow melting, and the like.
  • This indirect heat utilization method does not extract groundwater, so it does not affect people's living environment, so it is a sustainable geothermal collection method.
  • the problem of indirectly utilizing geothermal energy is that the inner wall of the outer tube has a limited surface area, and the heat that can be obtained from the surrounding high temperature rock layer and hot water and stored in the tube wall is limited, and the circulating medium is in gravity.
  • the downward flow rate is extremely fast under the action of the pumping pressure. Therefore, the circulation medium flows through the outer tube into the inner tube, and the circulation medium is extremely short in the extremely short crucible, and it is difficult to be sufficiently heated and obtain more in the extremely short crucible. Heat. Therefore, this way of indirect use of geothermal energy is very inefficient. Type a technical question here Said paragraph.
  • the present disclosure provides a heat exchanger including an outer tube disposed in a bore drilled vertically downward through the rig on the ground. And an inner tube disposed in the outer tube, a space between the outer tube and the inner tube passing through the inlet of the outer tube is injected into the outer tube to absorb heat, and becomes a high temperature circulating medium Flowing out through the inner tube thereby forming a heat exchange cycle, wherein the outer wall of the inner tube has a turbulence element that causes turbulence in the fluid between the inner tube and the outer tube.
  • the turbulence element is a protrusion that protrudes toward the inner wall of the outer tube.
  • the projections may be fins.
  • the fins are distributed in a spiral strip shape around the outer wall of the inner tube.
  • the spiral strip-shaped fins are integral spiral fins.
  • the spiral strip-shaped fins are intermittent spiral fins, and the spacing between the adjacent spiral fins surrounding the cylindrical outer wall of the inner tube does not exceed The length of each spiral fin.
  • the helical strip-shaped fin has a helix angle of between 45° and 60°.
  • the fin has a height of 5 to 15 mm, a root portion connected to the outer wall of the inner tube having a width of 2 to 5 mm, and a tip having a thickness of 0.5 to 3 mm.
  • the inner tube is an integrally injection molded PE or PPR tube, and each length is 6-
  • a heat exchanger including an outer tube disposed in a bore drilled vertically downward through the rig on the ground and an inner tube nested within the outer tube, a space of the low temperature circulating medium entering the outer tube and the inner tube through the inlet of the outer tube is injected into the outer tube to absorb heat, and then the high temperature circulating medium flows out through the inner tube, thereby forming a heat exchange cycle
  • the inner wall of the outer tube has a turbulence element that causes turbulence in the fluid between the inner tube and the outer tube.
  • the turbulence element is a protrusion that protrudes toward the outer wall of the inner tube.
  • the protrusion is a fin.
  • the fins are distributed in a spiral strip shape around the inner wall of the outer tube.
  • the spiral strip-shaped fins are integral spiral fins.
  • the spiral strip-shaped fins are intermittent spiral fins, and the pitch between the adjacent spiral fins surrounding the inner wall of the outer tube is not more than The length of each spiral fin.
  • the helical strip-shaped fin has a helix angle of between 45° and 60°.
  • the fin has a height of 5 to 15 mm
  • a root portion connected to the outer wall of the inner tube is 2-5 mm wide
  • a top end has a thickness of 0.5-3. Millimeter.
  • each length is 6-
  • FIG. 1 is a schematic structural view of an inner tube of a heat exchanger according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural view of a heat exchanger according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural view of an outer tube of a heat exchanger according to another embodiment of the present disclosure.
  • FIG. 4 is a schematic structural view of a heat exchanger according to another embodiment of the present disclosure.
  • FIG. 5 is a cross-sectional view of a fin on the inner or outer tube of the heat exchanger in accordance with the practice of the present specification.
  • first, second, third, etc. may be used to describe various information, the information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other.
  • first fin may also be referred to as a second fin without departing from the scope of the present disclosure.
  • second fin may also be referred to as a first fin.
  • word "if” as used herein may be interpreted as "in ⁇ " or "when ising” or "in response to ok”.
  • FIG. 1 is a schematic view showing the structure of an inner tube of a heat exchanger according to an embodiment of the present disclosure.
  • the outer wall of the inner tube 1 of the heat exchanger has a turbulence element 2.
  • the turbulence element 2 is a projection that protrudes toward the inner wall of the outer tube.
  • the turbulence element 2 is a fin which is spirally wound around the outer wall of the inner tube on the outer wall of the inner tube. The presence of the turbulence element 2 increases the strength of the inner tube 1.
  • the helix angle ⁇ of the spiral strip-shaped fin 2 is between 45° and 60°, for example, 50°, 55°, or the like.
  • the inner tube is an integrally injection molded ⁇ or PPR tube, each section is between 6-12 meters in length, and the length can be adjusted according to the specific construction geographical environment and construction process.
  • the spiral fin-shaped turbulence element 2 can be integrally molded by injection molding in the inner tube, or can be injection molded separately from the inner tube, and then the spiral fin can be bonded to the outside of the inner tube by bonding.
  • FIG. 2 is a schematic view showing the structure of a heat exchanger inner tube set in an outer tube according to an embodiment of the present disclosure.
  • the turbulence element 2 is located between the inner tube 1 and the outer tube 3. Within the mezzanine space.
  • the heat exchanger When the heat exchanger is working, the heat exchanger is filled with the internal circulating medium water for the heat exchange, and the metal tube wall of the outer tube of the heat exchanger is exchanged with the underground medium-deep layer geothermal layer to heat exchange.
  • Low temperature circulating medium inside the outer tube It becomes a high-temperature circulating medium, and the spiral fins inside the heat exchanger are sufficient to make the medium turbulent heat transfer and then become a high-temperature circulating medium heat exchanger from the inner tube. After the heat release, the low temperature medium enters the heat exchanger.
  • the tube and the inner tube sandwich are heat exchanged between the metal tube wall of the outer tube of the heat exchanger and the underground deep and deep layer geothermal layer, and are recycled.
  • the turbulence element 2 Although the purpose of the turbulence element 2 is to cause turbulence in the circulating medium flowing in the interlayer space between the inner tube 1 and the outer tube 3, in order to reduce the fluid resistance as much as possible, the turbulence element 2 is arranged in a spiral shape. Sheets to achieve a balance between heat transfer efficiency and flow rate.
  • the spiral strip-shaped fins are integral spiral fins, that is, the spiral strip-shaped fins continuously spirally extend around the outer wall of the inner tube. Alternatively, it can also be intermittent.
  • the spiral strip-shaped fin is a discontinuous spiral fin, that is, the spiral strip-shaped fin extends discontinuously around the outer wall of the inner tube, and between adjacent spiral fins The pitch of the spiral around the outer wall of the inner tube does not exceed the length of each spiral fin.
  • the outer tube of the heat exchanger adopts special seamless steel pipe cpl78mm, cp219mm, wall thickness 8-15mm
  • the inner tube of the heat exchanger adopts high strength such as PE, PPR, PER
  • the heat exchanger is arranged as a heat exchanger having a length of 2000 m or more, and the drilling hole is a drilling hole with a diameter of 200-300 mm drilled vertically downward on the ground, and the drilling depth is less than 2000 m.
  • FIG. 3 is a schematic view showing the structure of an outer tube of a heat exchanger according to an embodiment of the present disclosure.
  • the outer wall of the outer tube 4 of the heat exchanger has a turbulence element 5.
  • the turbulence element 5 is a projection that protrudes toward the outer wall of the inner tube.
  • the turbulence element 5 is a fin spirally wound around the inner wall of the outer tube around the inner wall of the outer tube.
  • the spiral angle ⁇ of the spiral strip-shaped fins 5 is between 45° and 60°, for example, 50°, 55°, or the like.
  • the inner tube is a integrally cast metal tube with good thermal conductivity, length per section Between 6-12 meters, the length can be adjusted according to the specific construction geographical environment and construction process.
  • the spiral fin-shaped turbulence element 5 may be integrally cast in the outer tube casting forming, or may be cast separately or drawn separately from the inner tube, and then the spiral fins may be bonded to the inner wall of the outer tube by welding or other means.
  • FIG. 4 is a schematic view showing the structure of an outer tube in which a heat exchanger is provided with an inner tube according to an embodiment of the present disclosure.
  • the turbulence element 5 is located in the inner tube 4 and the outer tube 6. Within the mezzanine space. Due to the presence of the turbulence element 5, the volume of the outer tube 4 is increased, so that more heat can be taken and stored from the formation or surrounding geothermal water in the same chamber. At the same time, the presence of the turbulence element 5 also increases the strength of the outer tube 4. Moreover, when a circulating medium, such as cold water, flows through the interlayer, it is hindered by the turbulence element 5.
  • a circulating medium such as cold water
  • the spiral strip-shaped fins 5 are integral spiral fins, that is, the spiral strip-shaped fins continuously spirally extend around the outer wall of the inner tube. Alternatively, it can also be intermittent.
  • the spiral strip-shaped fins 5 are intermittent spiral fins, that is, the spiral strip-shaped fins 5 extend discontinuously around the outer wall of the inner tube, and adjacent spiral fins The spacing between the spirals surrounding the outer wall of the inner tube does not exceed the length of each spiral fin.
  • FIG. 5 is a cross-sectional view of a fin on an inner or outer tube of a heat exchanger in accordance with an implementation of the present disclosure.
  • the height H of the fin 4 or 5 from the root portion connected to the tube wall to the tip end thereof is 5 to 15 mm
  • the thickness T B of the root portion connected to the tube wall is 2-5.
  • the thickness ⁇ of the tip is 0.5-3 mm.
  • the turbulence element 2 shown in FIGS. 1 and 2 is fin-shaped, it may be other shapes, for example, X-shaped in cross section, distributed in an array on the outer tube wall of the inner tube. .
  • the present disclosure provides a high-efficiency heat exchange tube for outer spiral fins of a medium-deep geothermal heat exchanger with improved heat transfer, increased strength, and easy process installation.
  • Heat exchanger according to the present disclosure After the installation, the heat exchange tube can reach 2000-3000m, which is fully suitable for the deep-medium geothermal mining. Since the inner tube and the outer tube have turbulence elements that enhance fluid disturbance outside the tube, heat transfer can be enhanced and heat exchange efficiency can be improved.
  • the medium-deep geothermal casing closed heat exchanger according to the present disclosure can be widely applied to underground meso-deep geothermal utilization in various regions. Since geothermal energy is available under each building, the use of geothermal energy is universal on the ground, and the selection of the drilling location is flexible and generally not subject to site conditions. In particular, the heat exchanger is environmentally friendly and does not have any carbon emissions.
  • the geothermal heat collection system using the heat exchanger of this specification is isolated from the groundwater, and only exchanges heat with the medium-deep layer high-temperature rock layer through the heat exchanger tube wall, and does not extract underground hot water, nor does it use ground water. According to the medium and deep geothermal casing closed heat exchangers of this class (more than 2000m deep), the energy demand of buildings around 15,000 m2 can be solved.
  • the medium-deep geothermal casing closed heat exchanger has a simple structure, a compact structure, and is convenient to manufacture.
  • the closed heat exchanger has a small aperture (200 ⁇ 300mm) and a depth of less than 2000m.
  • the closed heat exchange has no influence on the building foundation, and there are no moving parts in the ground, which greatly enhances the overall structural reliability.
  • the outer tube is made of special steel, which is corrosion-resistant, high-temperature resistant and high-pressure resistant, so it has a long service life.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Energy (AREA)
  • Geometry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un échangeur de chaleur comprenant un tuyau externe (3) disposé dans un trou de forage foré verticalement vers le bas par une machine de forage et un tuyau interne (1) gainé dans le tuyau externe (3). Un agent de circulation à basse température est injecté dans un espace entre le tuyau externe (3) et le tuyau interne (1) à travers une entrée du tuyau externe (3) ; après absorption de la chaleur en provenance du tuyau externe (3), l'agent devient un agent de circulation à haute température et sort du tuyau interne (1), formant ainsi une circulation d'échange de chaleur. Une paroi externe du tuyau interne (1) est munie d'un élément de turbulence (2) permettant la production de turbulence au moyen d'un fluide entre le tuyau interne (1) et le tuyau externe (3).
PCT/CN2016/106923 2016-08-03 2016-11-23 Échangeur de chaleur WO2018023900A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610629201.7 2016-08-03
CN201610629201.7A CN106091751A (zh) 2016-08-03 2016-08-03 换热器

Publications (1)

Publication Number Publication Date
WO2018023900A1 true WO2018023900A1 (fr) 2018-02-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2016/106923 WO2018023900A1 (fr) 2016-08-03 2016-11-23 Échangeur de chaleur

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CN (1) CN106091751A (fr)
WO (1) WO2018023900A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091751A (zh) * 2016-08-03 2016-11-09 马明辉 换热器
CN106123381A (zh) * 2016-08-03 2016-11-16 马明辉 换热管
CN107477895A (zh) * 2017-09-29 2017-12-15 上海中金能源投资有限公司 中深层地热井内换热器
CN109282515A (zh) * 2018-08-24 2019-01-29 河南环发工程有限公司 一种蓄热型地热提取装置及提取方法
JP2021046956A (ja) * 2019-09-17 2021-03-25 いすゞ自動車株式会社 熱交換器及び内燃機関のブローバイガス処理装置
CN111076435A (zh) * 2019-12-13 2020-04-28 西安科技大学 一种地热井下多回路换热方法

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