CN101581517B - Heat pump system of single-loop geothermal underground heat exchanger - Google Patents
Heat pump system of single-loop geothermal underground heat exchanger Download PDFInfo
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- CN101581517B CN101581517B CN2009100692834A CN200910069283A CN101581517B CN 101581517 B CN101581517 B CN 101581517B CN 2009100692834 A CN2009100692834 A CN 2009100692834A CN 200910069283 A CN200910069283 A CN 200910069283A CN 101581517 B CN101581517 B CN 101581517B
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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
Abstract
The invention discloses a technique and a device integrating a single-loop underground heat exchanger and a heat pump. In the invention, an underground heat exchanger is arranged in a geothermal well,a water supply pipeline and a water return pipeline of the underground heat exchanger are respectively connected with a one-way valve, a three-way valve, a stop valve, a water circulating pump, a wat er circulating tank and the like in series, and a heat pump system is connected with the water supply pipeline and the water return pipeline of the underground heat exchanger in parallel. When hot water supplied by the underground heat exchanger can not meet the requirement of a user, the temperature of the supplied water can be increased by a heat pump condenser, and returned water used for supplying heat obtains heat from underground water by a heat pump evaporator. By utilizing the integration of the single-loop geothermal underground heat exchanger and the heat pump technique, the water supply temperature is increased, the water inlet temperature of the underground heat exchanger is reduced simultaneously, the natural convection drive temperature difference of fluid in a geothermal heat storage layer is increased, and the heat exchange efficiency is enhanced. The heat efficiency of the invention is much times higher than that of a soil source embedded pipe heat exchanger. Simultaneously, the design requirement of the thermal storage temperature in a geothermal water-containing layer is broadened, and the internal temperature of the geothermal water-containing layer can be expanded below 50 DEG C.
Description
Technical field
The invention belongs to the geothermal heating technology, be specifically related to technology and device that single loop down-hole heat exchanger combines with heat pump.
Background technology
Geothermal underground heat exchanger and ground heat exchanger are different, its essential distinction is: the down-hole heat exchanger is that fluid and the interior GEOTHERMAL WATER layer fluid of well in the heat exchanger carried out heat exchange in the mode of free convection, and ground heat exchanger (being also referred to as source, ground buried tube heat exchanger sometimes) mainly relies on buried pipeline and surrounding soil to carry out heat exchange in the mode of heat conduction.Though the degree of depth of geothermal well is more or less the same, its individual well heat-obtaining amount of geothermal underground heat exchanger is at hundred kilowatts the order of magnitude, and the highest extraction heat can reach more than the 1000kW, and source, ground buried tube heat exchanger has only several kilowatts the order of magnitude, and 2-5kW is generally only arranged.From the heating demand angle, the heat that a cover geothermal underground heat exchanger extracts can exceed two orders of magnitude of ground heat exchanger.Certainly, adopt which kind of heat exchanger to decide according to local condition.The local geothermal underground heat exchanger system that adopts with good conditionsi will be more than the ground heat exchanger systematic economy.Geothermal underground heat exchanger also has not groundwater abstraction, no terrestrial heat water discharge, nonpollution environment, can protect advantages such as groundwater resources.Because relying on the free convection mode, geothermal underground heat exchanger conducts heat, therefore its heat-transfer mechanism, the present invention proposes a kind of mode of augmentation of heat transfer than the heat conduction problem complexity of ground heat exchanger, in conjunction with the power-saving technology of heat pump, reach the purpose of the down-hole heat exchanger being strengthened its free convection.
External most of geothermal underground heat exchanger all moves under the hot storage condition of geothermal using of higher temperature, and China has the local few of the hot storage condition of such underground heat.Experiment and theoretical study results show that the inlet temperature of the down-hole heat exchanger of flowing through is low more, and net heat output is big more.Therefore, in order to break through the restriction that is subjected to the temperature resources supplIes, make more area can use geothermal underground heat exchanger, the down-hole heat exchanger that proposition will have the augmentation of heat transfer pattern combines with heat pump.So not only can relax the restriction of underground heat heat storage resources supplIes, also can further reduce the inlet temperature of down-hole heat exchanger, improve the caloric receptivity of down-hole heat exchanger in water layer.
The purpose of this invention is to provide the heat pump that a kind of single loop combines with geothermal underground heat exchanger.By optimizing well casing geometric configuration parameter, down-hole heat exchanger operational factor is imported and exported the heat transfer of reinforcement geothermal underground heat exchangers such as water temperature.And, further reducing the coolant-temperature gage of going into of down-hole heat exchanger in conjunction with heat pump techniques, the free convection that increases the hot reservoir inner fluid of underground heat drives the temperature difference, improves heat exchange efficiency.
Summary of the invention
Know-why of the present invention is: the down-hole heat exchanger is inserted in the underground geothermal well, the confession of down-hole heat exchanger, water return pipeline are connected in series check valve, triple valve, stop valve, water circulating pump, cyclic water tank etc. respectively, and the heat pump that is made of condenser, compressor, evaporimeter and choke valve serial connection is connected in the confession, water return pipeline of down-hole heat exchanger (seeing accompanying drawing).Under heat supply mode, when the hot water temperature who confesses from the down-hole heat exchanger satisfied customer requirements, the condenser that this water supply is walked around in the heat pump directly entered the terminal heat supply of user; When the hot water temperature who confesses from the down-hole heat exchanger is low can not satisfy customer requirements the time, this water will be enhanced the terminal heat supply of the laggard access customer of temperature by the condenser in the heat pump.The lower backwater of the temperature of coming out from user's end perhaps directly enters down-hole heat exchanger or the evaporimeter in heat pump heat-obtaining from underground water once more according to the height of its temperature.Be that return water temperature is directly sent into the geothermal underground heat exchanger heat-obtaining when low, then extract heat when return water temperature is still higher by evaporator with heat pump, temperature enters geothermal underground heat exchanger after further reducing again, and to obtain bigger heat, whole system has only a single loop water circulation.Geothermal underground heat exchanger is by combining with the ground level heat pump assembly, further reduce the inlet water temperature of down-hole heat exchanger, the free convection that increases the hot reservoir inner fluid of underground heat drives the temperature difference, strengthened the heat transfer of geothermal underground heat exchanger, thereby improved the down-hole heat exchanger from geothermal using water layer or the systemic heat of water table.
The down-hole heat-exchange system is underground by becoming well floral tube and the sheath that becomes the casing butt joint to constitute the down-hole heat exchanger to imbed, and the down-hole heat exchanger places sheath.The down-hole heat exchanger is by two kinds of approach heat-obtainings: (1) carries out heat exchange with the geothermal water that flows through the water-bearing layer; (2) carry out heat exchange with Sidewall Surrounding Rock.The borehole wall belongs to pure fluid mass with interior, and heat exchange is mainly carried out in the free convection mode, is similar to shell-and-tube heat exchanger.Flow to the outer water-bearing layer of well by the underground water part of down-hole heat exchanger (heat-exchanging tube bundle) cooling by the floral tube wall, and the hot water in the outside water-bearing layer flows in the well by the floral tube wall, form continuous matter exchange, the heat that loses in the additional well keeps the stability of thermal output.Underground heat water layer beyond the borehole wall belongs to the porous media zone, and heat exchange is carried out with free convection and heat conduction dual mode simultaneously.
Description of drawings
Accompanying drawing is that structural principle of the present invention and parts connect sketch.
The specific embodiment
Below the present invention is further illustrated by specific embodiment.Heat pump system of single-loop geothermal underground heat exchanger has: down-hole heat exchanger, check valve, triple valve, stop valve, water circulating pump, storage tank, condenser, compressor, evaporimeter and choke valve etc.The concrete connected mode of each parts is: the feed pipe of down-hole heat exchanger 1 is connected in series first check valve 2-1, first triple valve 3-1, second stop valve 4-2, the 3rd stop valve 4-3, second triple valve 3-2, the 4th stop valve 4-4 successively, and the two ends of first stop valve 4-1 are connected to the other end of first triple valve 3-1 and second triple valve 3-2 respectively; The return pipe of down-hole heat exchanger 1 is connected in series second check valve 2-2, storage tank 6, the 5th stop valve 4-5, water circulating pump 5, the 3rd triple valve 3-3, the 6th stop valve 4-6, the 7th stop valve 4-7, the 4th triple valve 3-4 and the 8th stop valve 4-8 successively.The two ends of the 9th stop valve 4-9 are connected to the other end of the 4th triple valve 3-4 and the 3rd triple valve 3-3 respectively.Be connected in series confession, the water return pipeline that the heat pump that constitutes is connected to down-hole heat exchanger 1 by condenser 7, compressor 8, evaporimeter 9 and choke valve 10.Concrete connection is: condenser 7 is connected between second and the 3rd stop valve 4-2, the 4-3; Evaporimeter 9 is connected between the 7th and the 6th stop valve 4-7, the 4-6.Down-hole heat exchanger 1 is inserted in the underground geothermal well.
(can be higher than 45 ℃ during for fan coil if the water supply temperature of coming out from geothermal underground heat exchanger 1 is enough high such as terminal heating equipment, can be higher than 60 ℃ during for fin), then directly send into user's heat supply through first check valve 2-1, first triple valve 3-1, first stop valve 4-1, second triple valve 3-2 and the 4th stop valve 4-4.At this moment, then through second check valve 2-2, storage tank 6, the 5th stop valve 4-5, water circulating pump 5, the 3rd triple valve 3-3, the 9th stop valve 4-9, the 4th triple valve 3-4 and the 8th stop valve 4-8 inject geothermal underground heat exchanger 1 to the heat supply backwater.Get back to the circulating water and the interior hot water heat convection of geothermal well of down-hole heat exchanger, temperature flows out the down-hole heat exchanger after raising again, makes recirculated water constantly obtain heat from geothermal well.As previously mentioned, the inlet water temperature of the down-hole heat exchanger of flowing through is low more, and net heat output is big more.In order to obtain more heat, utilize heat pump further to reduce the circulating water temperature that injects geothermal underground heat exchanger.This moment, the circulation in water route was as follows: if supply water temperature is not high enough, to send into user's heat supply through first check valve 2-1, first triple valve 3-1, second stop valve 4-2,7, the three stop valve 4-3 of condenser, second triple valve 3-2, the 4th stop valve 4-4 from the water supply that geothermal underground heat exchanger comes out.Backwater injects geothermal underground heat exchanger heat-obtaining under the geothermal well through second check valve 2-2, storage tank 6, the 5th stop valve 4-5, water circulating pump 5, the 3rd triple valve 3-3, the 6th stop valve 4-6, evaporimeter 9, the 7th stop valve 4-7, the 4th triple valve 3-4 and the 8th stop valve 4-8 after the heat supply, owing to increased recirculated water and geothermal well hot water flooding dynamic temperature is poor, strengthened heat convection, increased the heat that recirculated water obtains from geothermal well.
Somewhere hot water well depth 102m, Cheng Jinghou floral tube internal diameter 302mm, the about 30m of water-bearing layer thickness, the shaft bottom maximum temperature is 60 ℃.The down-hole heat exchanger adopts " U " shape pipe to arrange heat exchanger water pipe internal diameter 50mm, the long 78m of inlet/outlet pipe.Present embodiment: under not in conjunction with the heat pump condition, 37 ℃ of down-hole heat exchanger inflow temperatures, flow 10m
3/ h, 43 ℃ of down-hole heat exchanger leaving water temperatures extract heat 70kW from the down-hole heat exchanger.After adding the 8kW source pump, 35 ℃ of down-hole heat exchanger inflow temperatures, flow 9m
3/ h, 46 ℃ of down-hole heat exchanger leaving water temperatures extract heat 115kW from the down-hole heat exchanger.Relatively increase heating demand 45kW with heat pump system not.For about 2000m
2Building winter heating heat.
The invention has the beneficial effects as follows, utilize single-loop geothermal underground heat exchanger to be combined with heat pump techniques, when improving supply water temperature, reduced again the coolant-temperature gage that enters of down-hole heat exchanger, the free convection that namely increases the hot reservoir inner fluid of underground heat drives the temperature difference, has improved heat exchange efficiency. The present invention exceeds than the hot device efficient of soil source buried tube heat exchanger and manys times. Relaxed simultaneously the designing requirement of hot storing temperature in the underground heat water-bearing layer, underground heat water-bearing layer internal temperature can be extended to below 50 ℃. Utilize geothermal underground heat exchanger for popularizing, develop rationally and effectively shallow layer geothermal energy a kind of new technology is provided.
Claims (1)
1. heat pump system of single-loop geothermal underground heat exchanger, has the down-hole heat exchanger, check valve, triple valve, stop valve, water circulating pump, storage tank, condenser, compressor, evaporimeter and choke valve, the feed pipe that it is characterized in that down-hole heat exchanger (1) is connected in series first check valve (2-1) successively, first triple valve (3-1), second stop valve (4-2), the 3rd stop valve (4-3), second triple valve (3-2), the 4th stop valve (4-4), the two ends of first stop valve (4-1) are connected to the other end of first triple valve (3-1) and second triple valve (3-2) respectively; The return pipe of down-hole heat exchanger (1) is connected in series second check valve (2-2) successively, storage tank (6), the 5th stop valve (4-5), water circulating pump (5), the 3rd triple valve (3-3), the 6th stop valve (4-6), the 7th stop valve (4-7), the 4th triple valve (3-4) and the 8th stop valve (4-8), the two ends of the 9th stop valve (4-9) are connected to the other end of the 4th triple valve (3-4) and the 3rd triple valve (3-3) respectively, by condenser (7), compressor (8), the heat pump that evaporimeter (9) and choke valve (10) serial connection constitute is connected to the confession of down-hole heat exchanger (1), water return pipeline, condenser (7) are connected to second and the 3rd stop valve (4-2,4-3); Evaporimeter (9) is connected between the 7th and the 6th stop valve (4-7,4-6), and down-hole heat exchanger (1) is inserted in the underground geothermal well.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100692834A CN101581517B (en) | 2009-06-16 | 2009-06-16 | Heat pump system of single-loop geothermal underground heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100692834A CN101581517B (en) | 2009-06-16 | 2009-06-16 | Heat pump system of single-loop geothermal underground heat exchanger |
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| Publication Number | Publication Date |
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| CN101581517A CN101581517A (en) | 2009-11-18 |
| CN101581517B true CN101581517B (en) | 2011-01-26 |
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| CN2009100692834A Expired - Fee Related CN101581517B (en) | 2009-06-16 | 2009-06-16 | Heat pump system of single-loop geothermal underground heat exchanger |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101858670B (en) * | 2010-05-28 | 2011-07-27 | 曾泉瑞 | Underwater heat exchanging device |
| CN102132681B (en) * | 2010-12-21 | 2012-11-21 | 天津市滨海新区九马能源工程技术有限公司 | Energy-saving cultivation seawater cleaning temperature-regulating system |
| CN102221251B (en) * | 2011-05-18 | 2012-12-19 | 巢民强 | Split depressurization water/ground energy cold and warm domestic hot water integrated central air conditioning unit |
| CN103090441A (en) * | 2011-11-02 | 2013-05-08 | 同方节能工程技术有限公司 | Low vacuum heating supply system of thermoelectric plant |
| CN103925739A (en) * | 2013-01-10 | 2014-07-16 | 江苏望远节能科技开发有限公司 | Closed single-tube vertical borehole ground-coupled heat pump system |
| CN103362476A (en) * | 2013-07-02 | 2013-10-23 | 天津大学 | Casing type downhole heat exchanger heating system capable of preventing wall of producing well from paraffin precipitation |
| DE102013214891A1 (en) * | 2013-07-30 | 2015-02-05 | Siemens Aktiengesellschaft | Thermal engineering interconnection of a geothermal energy source with a district heating network |
| CN104344620A (en) * | 2013-07-31 | 2015-02-11 | 曲滨 | Control device for well water distributor |
| CN104006478A (en) * | 2014-06-12 | 2014-08-27 | 天津大学 | Novel ground-source heat pump system and application |
| CN106403331B (en) * | 2016-08-30 | 2018-10-19 | 湖南中大经纬地热开发科技有限公司 | Heat pump hot-water system based on geothermal well |
| CN106949649B (en) * | 2017-04-17 | 2023-04-25 | 山西泰杰地能干热岩有限公司 | Geothermal energy dry-heat rock tree-shaped multipoint heat exchange system and heat exchange method thereof |
| CN107726439A (en) * | 2017-09-14 | 2018-02-23 | 河南理工大学 | A kind of heating system using coal mine gob thermal source |
| CN109612323B (en) * | 2018-12-06 | 2020-11-10 | 湖南达道新能源开发有限公司 | Deep hole heat exchanger for geothermal well |
| CN110631271A (en) * | 2019-10-25 | 2019-12-31 | 甘肃省建材科研设计院有限责任公司 | Medium-deep underground rock heat type heat supply system and heat supply method |
| CN112377965B (en) * | 2020-11-12 | 2022-04-12 | 中国石油天然气集团有限公司 | Geothermal heating system |
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2009
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Assignee: Dongli Lake Geothermal Development Co., Ltd. Assignor: Tianjin University Contract record no.: 2011120000035 Denomination of invention: Heat pump system of single-loop geothermal underground heat exchanger Granted publication date: 20110126 License type: Exclusive License Open date: 20091118 Record date: 20110328 |
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Granted publication date: 20110126 Termination date: 20130616 |