WO2020140406A1 - 无积液效应的阶梯式重力热管地热开采系统 - Google Patents

无积液效应的阶梯式重力热管地热开采系统 Download PDF

Info

Publication number
WO2020140406A1
WO2020140406A1 PCT/CN2019/092660 CN2019092660W WO2020140406A1 WO 2020140406 A1 WO2020140406 A1 WO 2020140406A1 CN 2019092660 W CN2019092660 W CN 2019092660W WO 2020140406 A1 WO2020140406 A1 WO 2020140406A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
liquid
heat pipe
liquid level
gravity heat
Prior art date
Application number
PCT/CN2019/092660
Other languages
English (en)
French (fr)
Inventor
蒋方明
黄文博
曹文炅
王亦伟
Original Assignee
中国科学院广州能源研究所
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 中国科学院广州能源研究所 filed Critical 中国科学院广州能源研究所
Priority to AU2019417822A priority Critical patent/AU2019417822B2/en
Priority to ES19906689T priority patent/ES2955239T3/es
Priority to EP19906689.5A priority patent/EP3961122B1/en
Priority to US16/960,328 priority patent/US11408646B2/en
Publication of WO2020140406A1 publication Critical patent/WO2020140406A1/zh

Links

Images

Classifications

    • 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
    • F24T10/40—Geothermal collectors operated without external energy sources, e.g. using thermosiphonic circulation or heat pipes
    • 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
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
    • 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
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
    • 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
    • F24T2010/56—Control arrangements
    • 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
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D2015/0216—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes having particular orientation, e.g. slanted, or being orientation-independent
    • 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 invention relates to the technical field of geothermal mining, in particular to a stepped gravity heat pipe geothermal mining system without liquid accumulation effect.
  • geothermal energy is stable and reliable, and is not affected by factors such as weather, seasons, climate, and day and night changes. It is more suitable as a basic energy source for heating and power systems.
  • geothermal resources not only include direct utilization of heating and planting, but also can achieve geothermal cooling and medium-high temperature geothermal resource power generation.
  • geothermal resources has also developed from medium-shallow hydrothermal resources to deeper geothermal resources such as dry hot rock resources.
  • the heat pipe uses the phase change of the working medium in the pipe to quickly transfer heat from the high temperature end to the low temperature end.
  • the heat pipe has the characteristics of high thermal conductivity, excellent isothermal property and so on, and is one of the most effective heat transfer equipments at present.
  • the use of heat pipes to extract the heat energy in dry hot rocks does not require additional pump work.
  • the heat transfer working fluid only circulates in the pipe, it can effectively avoid the loss of working fluid, pipeline scaling and environmental pollution. And other issues.
  • the invention provides a stepped gravity heat pipe geothermal mining system without liquid accumulation effect, so as to realize efficient mining of deep geothermal energy.
  • a stepped gravity heat pipe geothermal mining system without liquid accumulation effect includes a gravity heat pipe 1, a condenser 2 and a storage tank 3, wherein the gravity heat pipe 1 is located underground and the condenser 2 and the storage tank 3 are located on the ground;
  • the gravity heat pipe 1 includes an outer pipe 8 and an inner pipe 9, and the gap between the outer pipe 8 and the inner pipe 9 adopts a stepped partition structure, which is characterized in that a plurality of partition plates are provided in the gap between the outer pipe 8 and the inner pipe 9 10 and a plurality of liquid level control tubes 11, a plurality of partition plates 10 are sequentially arranged in the vertical direction in the area where the gravity heat pipe 1 is in contact with the high-temperature rock body 6, and divide the gap between the outer pipe 8 and the inner pipe 9 into a plurality of Section, two adjacent sections are connected through the liquid level control pipe 11, the topmost partition section is connected to the liquid return pipe 7, the liquid level control pipe 11 is a hollow pipe fixed on the partition plate, when the partition area When the liquid level in the section is higher than the pipeline, the liquid working fluid flows into the next stage separation section through the pipeline, so that the liquid level of each stage separation section is maintained at a certain height;
  • the liquid working fluid flows from the liquid storage tank 3 through the liquid return pipe 7 into the divided sections at different levels in the gap between the outer pipe 8 and the inner pipe 9 in order, and absorbs heat from the high temperature rock body 6 through the pipe wall of the outer pipe 8, Then it vaporizes into a gaseous working medium and enters the inner tube 9 and rises to the condenser 2; the condenser 2 performs heat exchange with the outside world, condenses the gaseous working medium into a liquid working medium, and sends it to the liquid storage tank 3, the liquid in the liquid storage tank 3 The liquid working medium then re-enters the gravity heat pipe 1 through the liquid return pipe 7 for circulation.
  • the inner wall of the outer tube 8 is provided with a certain length of liquid-absorbing core 12 in the lower region of the partition plate 10, and the bottom of the liquid-absorbing core 12 is immersed in the liquid working medium to ensure that the inner wall of the outer tube 8 is fully moistened in the area above the liquid level wet.
  • the inner tube 9 is provided with a number of air holes 13 on the wall surface between the top of the liquid level control tube 11 and the upper part of the partition plate 10, and the liquid working fluid enters the inner tube through the air holes 13 after absorbing heat and vaporizing in the divided section 9 and rise to condenser 2.
  • an opening is provided at the bottom of the inner tube 9, and the liquid working fluid at the bottom of the gap between the outer tube 8 and the inner tube 9 flows into the inner tube 9 through the opening, and the bottom of the inner tube 9 is provided inside the tube wall
  • a throttle valve 5 is provided in the connecting pipe between the storage tank 3 and the liquid return pipe 7, and the return flow rate of the liquid working fluid is adjusted by controlling the opening degree of the throttle valve 5.
  • the present invention Compared with the existing geothermal energy mining device, the present invention has the following advantages:
  • the present invention utilizes the phase change of the working medium in the heat pipe to spontaneously realize the exploitation of dry hot rock geothermal resources without providing auxiliary power to maintain the system operation; during the system operation, the pipeline heat transfer working medium is a closed cycle, No contact with rocks, avoiding problems such as loss of working fluid, scaling of pipelines and environmental pollution;
  • the heat pipe heat absorption section is designed as a stepped partition structure, and the liquid level of each partition section is limited to a certain height by a liquid level control tube. This design can ensure that the heat absorption section is fully wetted, and avoid the problem that the working fluid is difficult to evaporate due to the high liquid level, thereby greatly improving the heat transfer efficiency when using ultra-long heat pipes to extract geothermal energy;
  • the present invention includes a working fluid return flow control valve, and a liquid level detection device is arranged at the bottom of the heat pipe.
  • the working fluid return flow can be adjusted according to the liquid level detection device. The design is more practical and can ensure that there is no liquid accumulation and dry burning inside the heat pipe.
  • FIG. 1 is a schematic structural diagram of an embodiment of a stepped gravity heat pipe geothermal mining system without liquid accumulation effect of the present invention
  • FIG. 2 is a schematic diagram of connection of an inner tube, a flow control tube and a partition plate in an embodiment of the present invention
  • the stepped gravity heat pipe geothermal mining system without liquid accumulation effect in this embodiment includes a stepped gravity heat pipe 1, a condenser 2 and a storage tank 3;
  • the stepped gravity heat pipe 1 includes a liquid return pipe 7, an outer pipe 8, and an inner pipe 9
  • the liquid return pipe 7 is located in the gap between the outer pipe 8 and the inner pipe 9 and is connected to the storage tank 3; the steam outlet at the top of the inner pipe 9 is connected to the condenser 2; the condenser 2 performs heat exchange with the outside world, and its condensate outlet is connected to
  • the liquid storage tank 3 is connected; the liquid working fluid in the liquid storage tank 3 re-enters the stepped gravity heat pipe 1 through the liquid return pipe 7 to circulate.
  • a partition plate 10 In the gap between the outer tube 8 and the inner tube 9, a partition plate 10, a liquid level control tube 11 and a liquid absorbing wick 12 are provided.
  • the partition plates 10 are arranged at equal intervals in the area where the lower part of the heat pipe contacts the high-temperature rock 6, and The gap between the outer tube 8 and the inner tube 9 is divided into multiple sections. The topmost divided section is connected to the liquid return tube 7. Every two adjacent sections are communicated through the liquid level control tube 11; A number of air holes 13 are arranged on the wall surface between the top of the level control tube 11 and the upper partition 10; the arrangement and relative positions of the inner tube 9, the partition plate 10, the liquid level control tube 11 and the air holes 13 are shown in FIG. 2.
  • the inner wall of the outer tube 8 is provided with a certain length of wick 12 in the lower region of the partition plate 10, and the bottom of the wick 12 is immersed in the liquid working medium.
  • the bottom of the inner tube 9 is provided with an opening, and the bottom of the inner tube 9 is provided with an upper liquid level detector 14 and a lower liquid level detector 15 on the inner side of the pipe wall; the upper liquid level detector 14 is located below the air hole of the bottom partition section, The liquid level detector 15 is located above the opening in the bottom of the inner tube.
  • the accumulator tank 3 includes an exhaust/injection valve 4 for discharging non-condensable gas in the accumulator tank, as well as pouring fluid into the accumulator tank 3, a connecting pipe between the accumulator tank 3 and the return pipe 7 ⁇ 5 ⁇ The throttle 5 is provided.
  • the maximum acceptable liquid accumulation height of the working medium is determined through calculation or experiment;
  • the fluid working fluid flows from the liquid storage tank 3 through the liquid return pipe 7 to the topmost partition section.
  • the liquid working fluid will automatically flow in To the next level of separation section; the liquid working fluid of each separation section will absorb heat and gasify from the high-temperature rock body 6 through the outer tube 8 and become gaseous working fluid, and then enter the inner tube 9 through the gas hole 13 and It flows into the condenser 2 to radiate heat and condensate, and finally returns to the storage tank 3.
  • the partition plate 10 can be machined with grooves on the outer ring of the partition plate 10 for placing O-rings.
  • the wick 12 is attached to the inner wall of the outer tube 8.
  • the lower portion of the wick 12 should be fully immersed in the liquid working fluid to ensure that the inner wall of the outer tube 8 is fully wetted in the area above the liquid level.
  • High-temperature rock masses including but not limited to high-permeability water-bearing rock masses, dry hot rock masses, and artificial fractured rock masses constructed by means of hydraulic stimulation.
  • Working fluids including but not limited to distilled water, ammonia, carbon dioxide, and various organic working fluids.
  • an additional exhaust valve can be designed on the top of the outer tube 8 to evacuate the gap between the outer tube 8 and the inner tube 9 in the non-heat-absorbing area, so as to insulate the gaseous working medium in the inner tube 9.

Landscapes

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

Abstract

一种无积液效应的阶梯式重力热管地热开采系统，包括重力热管（1）、冷凝器（2）和蓄液箱（3），重力热管（1）包括回液管（7）、外管（8）、内管（9），回液管（7）位于外管（8）与内管（9）的间隙中并与蓄液箱（3）相连，外管（8）与内管（9）的间隙采用阶梯式分隔结构，液态工质通过回液管（7）从蓄液箱（3）中依次流入各级分隔区段，并透过外管（8）管壁从高温岩体（6）中吸热气化，变为气态工质之后再进入内管（9）并流入冷凝器（2），放热冷凝之后重新流入蓄液箱（3）中进行循环，通过液位控制管（11）将每个分隔区段的液位限制在一定高度。

Description

无积液效应的阶梯式重力热管地热开采系统 技术领域
本发明涉及地热开采技术领域，具体涉及一种无积液效应的阶梯式重力热管地热开采系统。
背景技术
随着化石燃料储量的减少，及其开发利用带来的环境问题日益严重，可再生且无污染的新能源备受人们关注。与其他可再生能源相比，地热能具有稳定可靠，不受天气、季节、气候和昼夜变化等因素影响的特点，更加适合作为供暖及电力系统的基础能源。目前地热资源开发利用不仅包括供暖、种植等直接利用，还能够实现地热制冷、中高温地热资源发电。此外，地热资源开发也从中浅层水热型资源，向着干热岩资源等更深赋存的地热资源发展。
热管利用管内工质的相变，可以将热量迅速地从高温端传输到低温端。热管具有较高的导热性、优良的等温性等特征，是目前最有效的传热设备之一。相比于常规地热系统，使用热管来提出干热岩中的热能不需要消耗额外的泵功，同时由于传热工质仅在管内循环，可以有效避免出现工质流失、管道结垢以及环境污染等问题。
目前传统重力热管已成功地用于浅层地热的开发和利用，如融雪、冻土层稳定、农业大棚升温、池塘加温等方面。但随着地热资源开采向着更深地层发展的同时，现有地热热管的技术瓶颈也日趋明显。目前应用于地热开采的重力热管中，为了保证吸热段的充分润湿需要在热管吸热段形成一段液柱，受到重 力的作用，处在液位较深处的工质压力较高，其饱和温度也较高。当液位深度大于一定值时，液态工质的饱和温度会高于管外温度，这时液态工质将无法蒸发，导致热管传热效率大大降低。
发明内容
本发明提供一种无积液效应的阶梯式重力热管地热开采系统，以实现对深层地热能的高效开采。
本发明采取的以下技术方案：
一种无积液效应的阶梯式重力热管地热开采系统，包括重力热管1、冷凝器2和蓄液箱3，其中，重力热管1位于地下，冷凝器2和蓄液箱3位于地面；
重力热管1包括外管8与内管9，外管8与内管9的间隙采用阶梯式分隔结构，该结构的特征为，在外管8与内管9的间隙中设有多个分隔板10和多个液位控制管11，多个分隔板10在垂直方向上依次布置于重力热管1与高温岩体6接触的区域，并将外管8与内管9的间隙分隔成多个区段，两个相邻的区段通过液位控制管11进行连通，最顶层分隔区段与回液管7相连，液位控制管11为固定在分隔板上的中空管道，当分隔区段中的液位高于该管道时，液态工质通过该管道流入下一级分隔区段，使得每级分隔区段的液位维持在一定高度；
液态工质通过回液管7从蓄液箱3中依次流入外管8与内管9间隙中的各级分隔区段，并透过外管8的管壁从高温岩体6中吸收热量，然后汽化为气态工质进入内管9并上升至冷凝器2；冷凝器2与外界进行热交换，将气态工质冷凝为液态工质，并输送至蓄液箱3，蓄液箱3中的液态工质再通过回液管7重新 进入重力热管1进行循环。
进一步地，外管8内壁在分隔板10下部区域布有一定长度的吸液芯12，吸液芯12底部浸没于液态工质中，以确保外管8内壁在液位以上的区域充分润湿。
进一步地，内管9在液位控制管11顶部与上部分隔板10之间的壁面上布有若干气孔13，液态工质在分隔区段中吸热汽化之后，通过气孔13进入到内管9并上升至冷凝器2。
进一步地，内管9底部设有开孔，外管8与内管9间隙中最底部分隔区段的液态工质通过该开孔流入到内管9中，内管9底部在管壁内侧设有上液位检测计14和下液位检测计15，其中，上液位检测计14位于最底部分隔区段的气孔13下方，下液位检测计15位于内管9底部开孔上方。
进一步地，蓄液箱3与回液管7的连接管道中设有节流阀5，通过控制该节流阀5的开度调节液态工质的回流量。
与现有地热能开采装置相比，本发明具有以下优点：
1)本发明利用热管内的工质相变作用，自发地实现干热岩地热资源的开采，不需要提供辅助动力来维持系统运行；系统运行过程中，管道传热工质为封闭式循环，不与岩石接触，避免了工质损失、管道结垢以及环境污染等问题；
2)本发明将热管吸热段设计为阶梯式分隔结构，通过液位控制管将每个分隔区段的液位限制在一定高度。该设计可以在保证吸热段充分润湿的同时，避免由于液位过高导致工质难以蒸发的问题，从而大幅提高了使用超长热管开采地热能时的传热效率；
3)本发明包含工质回流量控制阀，并在热管底部布置有液位检测装置。实际应用中，可以根据液位检测装置来调节工质回流量。该设计更具实用性，可以确保热管内部没有积液和干烧现象的产生。
附图说明
图1为本发明无积液效应的阶梯式重力热管地热开采系统实施例的结构示意图；
图2为本发明实施例中内管、流量控制管与分隔板的连接示意图；
附图标记说明：1、阶梯式重力热管；2、冷凝器；3、蓄液箱；4、排气/注液阀；5、节流阀；6、高温岩体；7、回液管；8、外管；9、内管；10、分隔板；11、液位控制管；12、吸液芯；13、气孔；14、上液位检测计；15、下液位检测计。
具体实施方式
下面结合附图和具体实施例对本发明进行详细说明。
本实施例无积液效应的阶梯式重力热管地热开采系统，包括阶梯式重力热管1、冷凝器2和蓄液箱3；阶梯式重力热管1包括回液管7、外管8、内管9；回液管7位于外管8与内管9的间隙中并与蓄液箱3相连；内管9顶部蒸汽出口与冷凝器2相连；冷凝器2与外界进行换热，其冷凝液出口与蓄液箱3相连；蓄液箱3中的液态工质通过回液管7重新进入到阶梯式重力热管1进行循环。
在外管8与内管9的间隙中设有分隔板10、液位控制管11和吸液芯12， 分隔板10以相等的间距布置于热管下部与高温岩石6接触的区域，并将外管8与内管9的间隙分隔成多个区段，最顶层分隔区段与回液管7相连，每两个相邻的区段通过液位控制管11进行连通；内管9在液位控制管11顶部与上部分隔板10之间的壁面上布有若干气孔13；内管9、分隔板10、液位控制管11和气孔13的布置方式及相对位置，参加图2。
外管8内壁在分隔板10下部区域布有一定长度的吸液芯12，吸液芯12底部浸没于液态工质中。
内管9底部设有开孔，内管9底部在管壁内侧设有上液位检测计14和下液位检测计15；上液位检测计14位于最底部分隔区段的气孔下方，下液位检测计15位于内管底部开孔上方。
蓄液箱3包含排气/注液阀4，用于排出蓄液箱中的不凝性气体，以及往蓄液箱3中灌注流体工质，蓄液箱3与回液管7的连接管道中设有节流阀5。
本实施例的实施方法是：
1)经地质勘查确定高温岩体靶区，并从地面向高温岩体6钻井；
2)将外管8放置于钻井内，在外管8和钻井井孔间灌注泥浆，用于固井和填充外管8与岩体之间的间隙；
3)根据井下测温数据和系统设计采热率，通过计算或实验确定工质可接受的最大积液高度；
4)以工质可接受的最大积液高度为间隔，在内管9的管壁上焊接分隔板10，并加工气孔13；在分隔板上焊接液位控制管11；在内管9最底部开孔，并布置 上下液位检测计1415；
5)将加工后的内管9和回液管7放置于外管8中，并在外管8内部布置吸液芯12，然后对外管8顶部进行密封，并将内管9顶部、冷凝器2、蓄液箱3和回液管7依次连通。
6)通过排气/注液阀4对系统抽真空，然后关闭节流阀5，往蓄液箱3中注入足量的流体工质；
7)逐渐开启节流阀5，使系统开始运行。当下液位检测计15未监测到液体浸没时，适当增加节流阀5开度，当上液位检测计14监测到液体浸没时，适当减小节流阀5开度；使内管中的液位保持在两个液位计之间，通过这种方法可以避免运行过程中热管内部出现干枯或积液现象；
8)运行过程中，流体工质从蓄液箱3中通过回液管7流入到最顶部分隔区段，当该分隔区的液位高于液位控制管11时，液态工质会自动流入到下一级分隔区段；每个分隔区段的液态工质会透过外管8从高温岩体6中吸热气化，变为气态工质之后再通过气孔13进入内管9，并流入到冷凝器2中放热冷凝，最后回流到蓄液箱3中。
分隔板10，为了保证分隔板10与外管8之间的密封性，可以在分隔板10外圈加工凹槽，用于放置O型密封圈。
吸液芯12贴于外管8的内壁之上，吸液芯12下部应充分浸没于液态工质中，确保能使外管8内壁在液位以上的区域充分润湿。
高温岩体，包括但不限于高渗透性含水岩体、干热岩、以及通过水力激发 等手段建造的人工裂隙岩体。
工质，包括但不限于蒸馏水、氨、二氧化碳、及各类有机工质。
可选的，可在外管8顶部设计额外的排气阀，将外管8与内管9在非吸热区域的间隙抽成真空，用于对内管9中的气体工质进行保温。
上列详细说明是针对本发明可行实施例的具体说明，该实施例并非用以限制本发明的专利范围，凡未脱离本发明所为的等效实施或变更，均应包含于本案的专利范围中。

Claims (10)

  1. 一种无积液效应的阶梯式重力热管地热开采系统，其特征在于；
    包括重力热管(1)、冷凝器(2)和蓄液箱(3)，其中，重力热管(1)位于地下，冷凝器(2)和蓄液箱(3)位于地面；
    重力热管(1)包括外管(8)与内管(9)，外管(8)与内管(9)的间隙采用阶梯式分隔结构，该结构的特征为，在外管(8)与内管(9)的间隙中设有多个分隔板(10)和多个液位控制管(11)，多个分隔板(10)在垂直方向上依次布置于重力热管(1)与高温岩体(6)接触的区域，并将外管(8)与内管(9)的间隙分隔成多个区段，两个相邻的区段通过液位控制管(11)进行连通，最顶层分隔区段与回液管(7)相连；液位控制管(11)为固定在分隔板上的中空管道，当分隔区段中的液位高于该管道时，液态工质通过该管道流入下一级分隔区段，使得每级分隔区段的液位维持在一定高度；
    液态工质通过回液管(7)从蓄液箱(3)中依次流入外管(8)与内管(9)间隙中的各级分隔区段，并透过外管(8)的管壁从高温岩体(6)中吸收热量，然后汽化为气态工质进入内管(9)并上升至冷凝器(2)；冷凝器(2)与外界进行热交换，将气态工质冷凝为液态工质，并输送至蓄液箱(3)，蓄液箱(3)中的液态工质再通过回液管(7)重新进入重力热管(1)进行循环。
  2. 根据权利要求1所述的无积液效应的阶梯式重力热管地热开采系统，其特征在于：
    外管(8)内壁在分隔板(10)下部区域布有一定长度的吸液芯(12)，吸 液芯(12)底部浸没于液态工质中，以确保外管(8)内壁在液位以上的区域充分润湿。
  3. 根据权利要求2所述的无积液效应的阶梯式重力热管地热开采系统，其特征在于：
    内管(9)在液位控制管(11)顶部与上部分隔板(10)之间的壁面上布有若干气孔(13)，液态工质在分隔区段中吸热汽化之后，通过气孔(13)进入到内管(9)并上升至冷凝器(2)。
  4. 根据权利要求3所述的无积液效应的阶梯式重力热管地热开采系统，其特征在于：
    内管(9)底部设有开孔，外管(8)与内管(9)间隙中最底部分隔区段的液态工质通过该开孔流入到内管(9)中，内管(9)底部在管壁内侧设有上液位检测计(14)和下液位检测计(15)，其中，上液位检测计(14)位于最底部分隔区段的气孔(13)下方，下液位检测计(15)位于内管(9)底部开孔上方。
  5. 根据权利要求4所述的无积液效应的阶梯式重力热管地热开采系统，其特征在于：
    蓄液箱(3)与回液管(7)的连接管道中设有节流阀(5)，通过控制该节流阀(5)的开度调节液态工质的回流量。
  6. 根据权利要求5所述的无积液效应的阶梯式重力热管地热开采系统，其特征在于：
    在分隔板(10)外圈加工凹槽，用于放置O型密封圈，以保证分隔板(10) 与外管(8)之间的密封性。
  7. 根据权利要求6所述的无积液效应的阶梯式重力热管地热开采系统，其特征在于：
    在外管(8)顶部设计排气阀，通过该排气阀将外管(8)与内管(9)在非吸热区域的间隙抽成真空，用于对内管(9)中的气态工质进行保温。
  8. 根据权利要求7所述的无积液效应的阶梯式重力热管地热开采系统，其特征在于：
    高温岩体(6)包括高渗透性含水岩体和干热岩，以及通过水力激发手段建造的人工裂隙岩体。
  9. 根据权利要求8所述的无积液效应的阶梯式重力热管地热开采系统，其特征在于：
    液态工质和气态工质中的工质包括蒸馏水、氨和二氧化碳，及各类有机工质。
  10. 根据权利要求9所述的无积液效应的阶梯式重力热管地热开采系统，其特征在于：
    内管(9)采用导热率较低的塑料管材，以实现对管内蒸汽的保温。
PCT/CN2019/092660 2019-04-23 2019-06-25 无积液效应的阶梯式重力热管地热开采系统 WO2020140406A1 (zh)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2019417822A AU2019417822B2 (en) 2019-04-23 2019-06-25 Ladder-structural gravity-assisted-heat-pipe geothermal energy recovery system without liquid-accumulation effect
ES19906689T ES2955239T3 (es) 2019-04-23 2019-06-25 Sistema de recuperación de energía geotérmica con estructura de escalera que utiliza conducto de calor asistida por gravedad sin efecto de acumulación de líquido
EP19906689.5A EP3961122B1 (en) 2019-04-23 2019-06-25 Geothermal energy mining system using stepped gravity-assisted heat pipe having no accumulated liquid effect
US16/960,328 US11408646B2 (en) 2019-04-23 2019-06-25 Ladder-structural gravity-assisted-heat-pipe geothermal energy recovery system without liquid-accumulation effect

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910328413.5A CN110030746B (zh) 2019-04-23 2019-04-23 无积液效应的阶梯式重力热管地热开采系统
CN201910328413.5 2019-04-23

Publications (1)

Publication Number Publication Date
WO2020140406A1 true WO2020140406A1 (zh) 2020-07-09

Family

ID=67239870

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/092660 WO2020140406A1 (zh) 2019-04-23 2019-06-25 无积液效应的阶梯式重力热管地热开采系统

Country Status (6)

Country Link
US (1) US11408646B2 (zh)
EP (1) EP3961122B1 (zh)
CN (1) CN110030746B (zh)
AU (1) AU2019417822B2 (zh)
ES (1) ES2955239T3 (zh)
WO (1) WO2020140406A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115790219A (zh) * 2022-11-22 2023-03-14 山东大学 一种用于提取废弃油气井内地热能的超长重力热管装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111678267A (zh) * 2020-05-29 2020-09-18 南京航空航天大学 超长重力环形热管地热提取装置及方法
CN111964499A (zh) * 2020-08-18 2020-11-20 哈尔滨工业大学（深圳） 热管与地热采集装置
CN113847755B (zh) * 2020-09-15 2023-04-28 中国科学院广州能源研究所 一种利用地热井实现高效蒸发的热泵系统及方法
CN113847745A (zh) * 2020-09-25 2021-12-28 中国科学院广州能源研究所 一种热管式取热集成冷电热联用的采-用一体化地热系统
CN112762631A (zh) * 2021-02-05 2021-05-07 闫广 一种深层地热取热地热系统及热管
CN114383333B (zh) * 2022-03-23 2022-06-17 四川大学 一种热交换装置
WO2023209417A1 (en) * 2022-04-26 2023-11-02 Domenico Daprocida Thermosiphon geothermal energy recovery systems and methods

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1553817A1 (ru) * 1988-03-24 1990-03-30 Московский энергетический институт Теплова труба
CN107144035A (zh) * 2017-05-16 2017-09-08 中国科学院广州能源研究所 一种工质循环流量可调控的回路热管式地热开采系统

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884293A (en) * 1973-07-23 1975-05-20 Isothermics Cooling means
FR2482272A1 (fr) * 1980-05-08 1981-11-13 Hengel Emile Dispositif de recuperation de l'energie geothermique
DE19953072A1 (de) * 1999-11-04 2001-05-10 Klett Ingenieur Gmbh Vorrichtung zur Nutzung von Erdwärme und Verfahren zu deren Betreibung
DE19932001A1 (de) * 1999-07-09 2001-01-25 Klett Ingenieur Gmbh Vorrichtung zur Nutzung von Erdwärme und Verfahren zu deren Betreibung
JP2004309124A (ja) * 2003-03-25 2004-11-04 Mitsui Eng & Shipbuild Co Ltd 地中熱交換器
CN101696829A (zh) * 2009-10-30 2010-04-21 龚智勇 地热能远距离传热储能的方法、其装置及应用
AU2013246091B2 (en) * 2012-04-10 2017-06-15 Earth To Air Systems, Llc Ground loops and insulation for direct exchange geothermal systems
EP2847423A4 (en) * 2012-05-09 2016-03-16 Halliburton Energy Services Inc ENHANCED GEOTHERMAL SYSTEMS AND METHODS
WO2014081911A2 (en) * 2012-11-21 2014-05-30 Aavid Thermalloy, Llc System and method for geothermal heat harvesting
US9091460B2 (en) * 2013-03-21 2015-07-28 Gtherm, Inc. System and a method of operating a plurality of geothermal heat extraction borehole wells
WO2017003239A1 (ko) * 2015-06-30 2017-01-05 한국생산기술연구원 지열정 단열 파이프, 지열정 파이프 어셈블리 및 지열정 열교환시스템과 그의 시공방법
CN205090847U (zh) * 2015-07-02 2016-03-16 中国石油化工集团公司 一种开采地热用的重力热管及换热装置
EP3165863A1 (en) * 2015-11-04 2017-05-10 Linde Aktiengesellschaft Waste heat recovery
JP6932346B2 (ja) * 2017-03-31 2021-09-08 三菱重工サーマルシステムズ株式会社 地中熱利用システム及び地中熱利用方法
CN108344317A (zh) * 2018-02-08 2018-07-31 西南石油大学 一种利用帕尔帖效应辅助的超长重力热管地热开发系统
CN109029033B (zh) * 2018-05-31 2019-10-11 东北石油大学 井筒内低品位余热回收的串级式翅片重力热管装置
JP2023530744A (ja) * 2020-06-17 2023-07-19 セージ ジオシステムズ インク 地熱の熱収穫のためのシステム、方法、及び構成
CN113847755B (zh) * 2020-09-15 2023-04-28 中国科学院广州能源研究所 一种利用地热井实现高效蒸发的热泵系统及方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1553817A1 (ru) * 1988-03-24 1990-03-30 Московский энергетический институт Теплова труба
CN107144035A (zh) * 2017-05-16 2017-09-08 中国科学院广州能源研究所 一种工质循环流量可调控的回路热管式地热开采系统

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115790219A (zh) * 2022-11-22 2023-03-14 山东大学 一种用于提取废弃油气井内地热能的超长重力热管装置
CN115790219B (zh) * 2022-11-22 2024-05-28 山东大学 一种用于提取废弃油气井内地热能的超长重力热管装置

Also Published As

Publication number Publication date
CN110030746A (zh) 2019-07-19
AU2019417822B2 (en) 2021-08-05
AU2019417822A1 (en) 2020-11-12
CN110030746B (zh) 2020-05-26
US20210254862A1 (en) 2021-08-19
EP3961122A4 (en) 2022-06-08
ES2955239T3 (es) 2023-11-29
EP3961122A1 (en) 2022-03-02
EP3961122B1 (en) 2023-08-09
US11408646B2 (en) 2022-08-09
EP3961122C0 (en) 2023-08-09

Similar Documents

Publication Publication Date Title
WO2020140406A1 (zh) 无积液效应的阶梯式重力热管地热开采系统
US8650875B2 (en) Direct exchange geothermal refrigerant power advanced generating system
CN101832673B (zh) 利用油层套管传导地下热能再利用的方法及装置
CN101696829A (zh) 地热能远距离传热储能的方法、其装置及应用
WO2022022750A1 (zh) 一种利用地热井实现高效蒸发的热泵系统及方法
US20130192816A1 (en) Single Well, Self-Flowing, Geothermal System for Energy Extraction
CN105674608A (zh) 一种提取利用地热能的装置及方法
CN201555480U (zh) 一种重力真空热管传热装置
CN212340029U (zh) 一种超长重力热管系统
CN111964286A (zh) 超长重力循环管地热供暖装置及方法
CN112268474A (zh) 一种地热能提取装置及提取方法
Lund et al. Analysis of deep-heat energy wells for heat pump systems
CN105546860A (zh) 一种提取利用地热能的装置及方法
CN104653417A (zh) 中间介质为氨的干热岩地热发电系统
CN201652970U (zh) 利用油层套管传导地热能的装置
KR20130063394A (ko) 지열교환기 및 이를 이용한 열교환 시스템
CN110761857B (zh) 一种地热阶梯举升装置
CN106813411B (zh) 废地热井再利用系统及其施工方法
CN102692150B (zh) 利用地埋管换热的季节性蓄热系统
CN205561323U (zh) 一种提取利用地热能的装置
CN215864110U (zh) 中深层地热能取热结构
CN206683260U (zh) 废地热井再利用系统
CN106123382A (zh) 深层真空超导储能换热地埋管装置
CN106885385B (zh) 单井干热岩热能提取系统
CN114061344A (zh) 一种超长重力热管系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19906689

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2019417822

Country of ref document: AU

Date of ref document: 20190625

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2019906689

Country of ref document: EP

Effective date: 20211123