CN114076417A - Geothermal well operation method taking heat taking and heat storage into consideration - Google Patents

Geothermal well operation method taking heat taking and heat storage into consideration Download PDF

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Publication number
CN114076417A
CN114076417A CN202111253828.4A CN202111253828A CN114076417A CN 114076417 A CN114076417 A CN 114076417A CN 202111253828 A CN202111253828 A CN 202111253828A CN 114076417 A CN114076417 A CN 114076417A
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China
Prior art keywords
heat
geothermal
well
deep
layer
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Pending
Application number
CN202111253828.4A
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Chinese (zh)
Inventor
吕心力
张家琪
张伟
余浩
柳佳丽
任亚鹏
张亚林
朱天际
岳雯
李淑慧
李晨晨
胡茂芹
刘东喜
孟庆瑶
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Tianjin University
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Tianjin University
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Priority to CN202111253828.4A priority Critical patent/CN114076417A/en
Publication of CN114076417A publication Critical patent/CN114076417A/en
Pending legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/18—Hot-water central heating systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F24F2005/0057—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground receiving heat-exchange fluid from a closed circuit in the ground
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/40—Geothermal heat-pumps
    • 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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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

The invention relates to a geothermal well operation method taking heat extraction and heat storage into consideration, which comprises the following steps: the method comprises a winter heating stage and a summer refrigerating stage, and realizes the functions of heat taking and heat storage through a middle-deep layer closed geothermal single-well system. The heat is taken from the rocks in winter, heat is stored in the rocks in summer, the heat balance of underground rocks is maintained, the service life of the system is prolonged, the energy is effectively saved, and the efficient utilization of the energy is realized.

Description

Geothermal well operation method taking heat taking and heat storage into consideration
Technical Field
The invention belongs to the field of geothermal resource utilization, relates to a geothermal well operation method, and particularly relates to a geothermal well operation method taking heat extraction and heat storage into consideration.
Background
In order to realize the purposes of carbon peak reaching and carbon neutralization, the main direction of future energy development is to change the energy structure of China and vigorously develop renewable energy. Among renewable energy sources, geothermal energy has been widely used in various fields due to its advantages of large reserves, cleanliness and stability.
In China, geothermal resources mainly supply heat, but after the country limits to draw geothermal water for heating, a single-well heat-taking system for middle-deep geothermal heat becomes a good heating mode. But in summer, a heat pump system is needed to supply cold for users and simultaneously transfer heat to the rock layer. However, because the bottom temperature of the medium-deep geothermal heat is higher, the geothermal water is difficult to be raised to a temperature higher than the temperature of rocks around the bottom of the geothermal single-well system by using the heat pump system, so that the heat can not be transferred to the stratum while refrigerating in summer like a shallow ground source heat pump, and heating in winter and refrigerating in summer can not be realized, which also has certain influence on the long-term operation of the system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a geothermal well operation method which gives consideration to heat taking and heat storage.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a geothermal well operation method for taking heat and storing heat into consideration is realized by a middle-deep layer closed geothermal single well system, the system comprises a middle-deep layer geothermal single well, the middle-deep layer geothermal single well sequentially passes through a low-temperature rock layer and a middle-high temperature rock layer from top to bottom, an inner pipe pipeline is inserted into the middle-deep layer geothermal single well, an annular pipeline is coaxially sleeved outside the inner pipe pipeline in the middle-deep layer geothermal single well, a one-way valve is arranged on the inner pipe pipeline, the ground end of the middle-deep layer geothermal single well is connected with a heat pump system, and the system is connected with a user end; the method comprises the following steps: a heating stage in winter and a cooling stage in summer,
(1) a winter heating stage; the one-way valve is closed, geothermal water enters the single-well heat taking system through the annular pipeline, flows out of the inner pipe pipeline after absorbing heat at the bottom of the well and being heated, enters the heat pump system after flowing out of the geothermal single-well system, and flows back to the annular pipeline of the geothermal single-well system after transferring the heat to the heat pump system to complete circulation, the heat pump system transfers the heat to circulating water after absorbing the heat brought by the geothermal water, and the circulating water returns to the heat pump system after transferring the heat to a user side for heating to complete circulation;
(2) and (3) in a refrigeration stage in summer: the check valve is opened, geothermal water enters the geothermal single-well system through the inner pipe pipeline, then flows into the annular pipeline through the middle check valve opening, heat is transferred to surrounding rocks and then flows out through the annular pipeline, geothermal water enters the heat pump system after flowing out of the geothermal single-well system, flows into the inner pipe pipeline of the geothermal single-well system after absorbing heat, circulation is completed, the heat pump system transfers heat to geothermal water after absorbing heat of circulating water, the circulating water returns to a user after the heat pump system is cooled, and refrigeration is provided for the user.
And the annular pipeline is arranged in the low-temperature rock interval in the middle-deep closed geothermal single well system.
And, the check valve is installed on the inner pipe corresponding to the lower part of the ring pipe in the middle-deep closed geothermal single well system.
The invention has the advantages and positive effects that:
the invention has scientific and reasonable design, low manufacturing cost and simple and convenient construction, and provides the geothermal well operation method which gives consideration to heat taking and heat storage.
The heat taking system in the method is a closed single-well heat taking system, the problem that geothermal water of an open heat taking system is difficult to recharge is solved, a heat source is intermediate-deep geothermal energy, and the functions of summer refrigeration and winter heating of the system can be realized by adopting a mode of opening the middle.
The method of the invention provides refrigeration for users in summer and stores heat in the underground rock layer without discharging the heat to the atmosphere, thus avoiding the problem of higher and higher environmental temperature in summer. The system realizes heat extraction from rocks in winter and heat storage to the rocks in summer, maintains the heat balance of underground rocks, and prolongs the service life of the system.
Drawings
FIG. 1 is a schematic diagram of a deep geothermal single well heat extraction system according to the present invention;
FIG. 2 is a schematic diagram of winter heating of a deep geothermal single-well heat extraction system according to the present invention;
FIG. 3 is a schematic diagram of the summer refrigeration of the deep geothermal single-well heat-extraction system according to the present invention;
the reference numerals are explained below:
1. the system comprises a low-temperature rock layer 2, an annular pipeline 3, an inner pipe pipeline 4, a one-way valve 5, a heat pump system 6 and a user.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, which are illustrative only and not limiting, and the scope of the present invention is not limited thereby.
A geothermal well operation method taking heat taking and storing into consideration is realized through a middle-deep-layer closed geothermal single well system, the system comprises a middle-deep-layer geothermal single well, the middle-deep-layer geothermal single well sequentially penetrates through a low-temperature rock layer 1 and a middle-high-temperature rock layer (on the lower portion of the low-temperature rock layer) from top to bottom, an inner pipe pipeline 3 is inserted into the middle-deep-layer geothermal single well, an annular pipeline 2 is coaxially sleeved on the outer side of the inner pipe pipeline in the middle-deep-layer geothermal single well, the annular pipeline is arranged on a rock layer section, a check valve 4 is arranged on the inner pipe pipeline, and the check valve is arranged on the inner pipe pipeline at a position corresponding to the lower portion of the annular pipeline.
And the ground end of the middle-deep geothermal single well is connected with a heat pump system 5 which is connected with a user 6 end.
Specifically, during the winter heating phase, the check valve is closed. Geothermal water enters the single-well heat-taking system through the annular pipeline, absorbs heat at the bottom of the well and flows out of the inner pipeline after being heated. And geothermal water flows out of the geothermal single-well system and then enters the heat pump system, heat is transferred to the heat pump system and then flows back to the annular pipeline of the geothermal single-well system, and circulation is completed. The heat pump system absorbs heat brought by geothermal water and then transfers the heat to circulating water, and the circulating water transfers the heat to a user for heating and then returns to the heat pump system to complete circulation.
In the summer refrigeration stage, the check valve is opened. Geothermal water enters the geothermal single-well system through the inner pipe pipeline, then flows into the annular pipeline through the opening of the middle one-way valve, and flows out of the annular pipeline after heat is transferred to surrounding rocks. Geothermal water flows out of the geothermal single-well system, then enters the heat pump system, and flows into an inner pipe pipeline of the geothermal single-well system after absorbing heat, so as to complete circulation. The heat pump system absorbs the heat of the circulating water and then transfers the heat to the geothermal water. The circulating water returns to the user after being cooled by the heat pump system, and a certain refrigerating capacity is provided for the user.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.

Claims (3)

1. A geothermal well operation method taking heat taking and heat storage into consideration is characterized in that: the method is realized by a middle-deep-layer closed geothermal single well system, which comprises a middle-deep-layer geothermal single well, wherein the middle-deep-layer geothermal single well sequentially penetrates through a low-temperature rock layer and a middle-high-temperature rock layer from top to bottom, an inner pipe is inserted into the middle-deep-layer geothermal single well, an annular pipe is coaxially sleeved outside the inner pipe in the middle-deep-layer geothermal single well, a one-way valve is arranged on the inner pipe, the ground end of the middle-deep-layer geothermal single well is connected with a heat pump system, and the system is connected with a user end; the method comprises the following steps: a heating stage in winter and a cooling stage in summer,
(1) heating in winter: the one-way valve is closed, geothermal water enters the single-well heat taking system through the annular pipeline, flows out of the inner pipe pipeline after absorbing heat at the bottom of the well and being heated, enters the heat pump system after flowing out of the geothermal single-well system, and flows back to the annular pipeline of the geothermal single-well system after transferring the heat to the heat pump system to complete circulation, the heat pump system transfers the heat to circulating water after absorbing the heat brought by the geothermal water, and the circulating water returns to the heat pump system after transferring the heat to a user side for heating to complete circulation;
(2) and (3) in a refrigeration stage in summer: the check valve is opened, geothermal water enters the geothermal single-well system through the inner pipe pipeline, then flows into the annular pipeline through the middle check valve opening, heat is transferred to surrounding rocks and then flows out through the annular pipeline, geothermal water enters the heat pump system after flowing out of the geothermal single-well system, flows into the inner pipe pipeline of the geothermal single-well system after absorbing heat, circulation is completed, the heat pump system transfers heat to geothermal water after absorbing heat of circulating water, the circulating water returns to a user after the heat pump system is cooled, and refrigeration is provided for the user.
2. The operation method of the geothermal well combining heat extraction and heat storage as claimed in claim 1, wherein the operation method comprises the following steps: the annular pipeline is arranged on the low-temperature rock layer in the middle-deep layer closed geothermal single well system.
3. The operation method of the geothermal well combining heat extraction and heat storage as claimed in claim 1, wherein the operation method comprises the following steps: in the middle-deep closed geothermal single well system, the check valve is arranged on the position, corresponding to the lower part of the annular pipeline, of the inner pipeline.
CN202111253828.4A 2021-10-27 2021-10-27 Geothermal well operation method taking heat taking and heat storage into consideration Pending CN114076417A (en)

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CN202111253828.4A CN114076417A (en) 2021-10-27 2021-10-27 Geothermal well operation method taking heat taking and heat storage into consideration

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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101005231B1 (en) * 2010-04-27 2010-12-31 (주)넥스지오 Control system for thermal energy storage in aquifer
RU2445554C1 (en) * 2010-08-20 2012-03-20 Учреждение Российской академии наук Институт проблем геотермии Дагестанского научного центра РАН System of heat supply and hot water supply based on renewable energy sources
CN111609574A (en) * 2019-02-25 2020-09-01 国家电投集团科学技术研究院有限公司 Sustainable-utilization cross-season geothermal energy development system
CN112833573A (en) * 2020-12-31 2021-05-25 魏巍 Medium-deep geothermal energy same-well balanced mining and irrigating heat exchange system and application
CN214469065U (en) * 2021-03-12 2021-10-22 内蒙古科技大学 Dual-energy heat supply single-energy cooling system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101005231B1 (en) * 2010-04-27 2010-12-31 (주)넥스지오 Control system for thermal energy storage in aquifer
RU2445554C1 (en) * 2010-08-20 2012-03-20 Учреждение Российской академии наук Институт проблем геотермии Дагестанского научного центра РАН System of heat supply and hot water supply based on renewable energy sources
CN111609574A (en) * 2019-02-25 2020-09-01 国家电投集团科学技术研究院有限公司 Sustainable-utilization cross-season geothermal energy development system
CN112833573A (en) * 2020-12-31 2021-05-25 魏巍 Medium-deep geothermal energy same-well balanced mining and irrigating heat exchange system and application
CN214469065U (en) * 2021-03-12 2021-10-22 内蒙古科技大学 Dual-energy heat supply single-energy cooling system

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