CN110207408A - A kind of mid-deep strata underground heat exchanger that interior caliber accounting is variable - Google Patents
A kind of mid-deep strata underground heat exchanger that interior caliber accounting is variable Download PDFInfo
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/17—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—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
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- 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
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present invention relates to the mid-deep strata underground heat exchangers that a kind of interior caliber accounting can be changed, it is characterized by: main outer tube, main inner tube and from pipe unit one end be connected to, the other end is respectively arranged with main outer tube interface, interface tube and from interface tube in main, main outer tube interface is connected to the outlet of heat pump unit source, interface tube is connected to heat pump unit source entrance in main, switching communicating pipe is respectively connected with from several slave pipe fittings from pipe of pipe unit, outermost layer switching in switching communicating pipe is connected to the outlet of heat pump unit source communicating pipe, other switchings are connected to heat pump unit source entrance communicating pipe in switching communicating pipe.It is of the invention it is each from pipe be nested structure, convenient for construction down tube, and can change the interior caliber accounting of mid-deep strata underground heat exchanger, reduce the operation energy consumption of circulating pump, improve economy；It is also possible to apply the invention to the upgrading of existing mid-deep strata underground heat exchanger heating system, in old system, existing inner tube be can be used as continues to use from one of pipe, reduces initial cost.
Description
Technical field
The invention belongs to mid-deep strata geothermal utilization fields, are related to mid-deep strata underground heat exchanger, in particular to a kind of interior caliber
The variable mid-deep strata underground heat exchanger of accounting.
Background technique
With quickly propelling for China's Urbanization Construction, building energy consumption has become one of China's main energy sources consumption,
In building energy consumption, air-conditioning, heat supply and energy consumption of hot water proportion are maximum.2015, national building energy consumption accounted for total energy consumption
19.93%, wherein northern heating energy consumption accounting 21%.From the point of view of long term growth angle, in the dual-pressure of energy and environment
Under, Renewable Energy Development heating is to realize that the energy-saving and emission-reduction of building heating field are most basic, optimal path, significant.
Geothermal energy is one kind of renewable energy, is buried in earth's surface thermal energy below.Geothermal energy resources include naturally occurring
Or the geothermal fluids or hot dry rock etc. such as hot water, hot steam being artificially introduced ground heat carrier.Geothermal energy resources can be divided by mining depth
Shallow-layer, mid-deep strata and ultra deep geothermal energy resources.Shallow layer geothermal energy is generally in earth's surface 200m with shallow, and mid-deep strata geothermal energy is generally on ground
Between lower 200~3000m.The geothermal energy resources type utilized by building heating is generally shallow-layer or mid-deep strata, and mining method can
Be divided into " water intaking takes heat " type and " take heat do not fetch water " type, the former direct pumping underground hot water, after the heat exchange of ground again recharge to ground
In layer, the latter then passes through enclosed heat exchanger and underground indirect heat exchange, and the heat of absorption is passed to ground with media such as water.
In recent years, the problems such as being influenced due to resource and environment, the development of " water intaking takes heat " type technology are limited, on the one hand, underground heat
Fluid belongs to mineral resources, is not seen everywhere, also not inexhaustible；On the other hand, it wastes and returns for terrestrial heat resources
The environmental problems such as the water pollution of unfavorable initiation are filled, it is same that governments at all levels require mid-deep strata GEOTHERMAL WATER that must carry out cascade utilization and whole
" adopting surely to fill " is carried out in layer recharge, this proposes challenges and tests to existing recharging technique, and initial cost and fortune greatly improved
Row cost.Therefore, " take heat do not fetch water " type mid-deep strata geothermal utilization technology is concerned in recent years.
Currently, conventional " heat is taken not fetch water " type mid-deep strata geothermal utilization technology generally uses coaxial-type underground heat exchanger to mention
Geothermal energy is taken, system diagram is as shown in Figure 1, wherein circulatory mediator (generally water) is flowed into from underground heat exchanger outer tube top, the bottom of at
Portion flows into inner tube, then flows out at the top of inner tube, and this type of flow can guarantee can be from guarantor by the circulatory mediator of geothermal heating
It is flowed out in warm preferable inner tube, avoids thermal loss.Outer tube is generally thermally conductive preferable metal well casing, and inner tube is generally by heat insulating ability
It can preferable material production.Since such current system is still in research and demonstrating running stage, temporarily without concerned countries or industry
Standard proposes to be strict with to the design of mid-deep strata underground heat exchanger.It is " noiseless in Shaanxi Province's provincial standard that 2016 announce
Heat-supply system based upon geothermal energy engineering legislation " in (DB61/T 1053-2016), also how not internal pipe size, which designs, is illustrated.
The Master's thesis that University Of Tianjin Li Siqi was delivered in 2018 " grind by the heat exchange of enclosed mid-deep strata underground and parameter influence
Study carefully " in, it is found by numerical simulation study, in the case where size of outer tube, flow and certain inlet temperature, interior pipe size is got over
Small, heat transfer effect is better, for 3000m depth, when the ratio between interior caliber and (interior caliber+outer tube diameter) are increased to 0.91 from 0.08
When, linear meter(lin.m.) heat exchange amount has dropped 8.5%.
However, the research has only focused on the influence of interior caliber accounting exchange thermal effect, and it is had ignored to flow resistance
It influences.When interior caliber reduces, the decline of internal circulation sectional area, flow velocity rises, and then significantly improves flow resistance.In reality
In the engineering of border, biggish flow resistance requires circulating pump to have sufficiently high lift, improves initial cost and the operation of circulating pump
Energy consumption.Start geothermal heat exchanger on-way resistance in written " closed-loop ground source heat pump technology " the 3.4.5 section of flood according to Diao Nairen, side
Calculation formula calculates the on-way resistance under caliber accounting in difference, obtained conclusion are as follows: with interior caliber accounting by
It gradually reduces pipe size in i.e. to be gradually reduced, total on-way resistance presentation first reduces the trend being ramping up afterwards, when interior caliber accounting
When being 0.1, total on-way resistance increases about 3093 times when than interior caliber accounting being 0.6, although heat transfer effect at this time is most
Good, but in practical applications, corresponding lift is difficult to be matched to the circulating pump of such high lift close to 400m, even if can be with
It is matched to, price also can be very high.
By taking German WILO board circulating pump as an example, by the price and performance of calculating different centrifugal pumps, it is known that: MHI 406 compares
402 rated head of MHI increases about 3.4 times, just corresponds to interior caliber accounting from 0.6 and is reduced to 0.3~0.4, and rated power
About 2.7 times are then increased, price increases about 1.5 times.Therefore, although heat exchanger heat exchange can be improved in caliber accounting in reducing
Amount, but thus the increase of bring circulating pump energy consumption and initial cost should not be overlooked.
In addition, in the same different months for the hot season or different periods on the same day, heating load be also difference very
Big, need to extract less geothermal energy only when load is lower to meet unit normal operation.Pass through sampling point
Analysis is it is found that each month typical per day thermic load has larger difference, and wherein the per day thermic load of freeze-up in January at the beginning of 11 months than trembling with fear
Phase and cold phase at 3 the end of month have increased separately about 42% and 93%；And for the same moon, typical daily peak load and minimum load
Also difference is larger, and by taking January as an example, typical daily peak load is about 2.1 times of minimum load.If will be entirely for each moment in hot season
It compares, the ratio between maximum load and minimum load are up to 7.16 times.
According to peak load design is met when due to heat-supply system based upon geothermal energy design, for hot season most of moment well
Lower heat exchanger has enough heat exchange potentiality, if all being run in the case where taking the maximized underground design of heat exchanger of thermal energy power, heat exchange
The effect that effect promoting reduces heat pump unit operation energy consumption is not significant, and pump operating cycle energy consumption then can be relatively excessively high.
To sum up, if can be designed a kind of mid-deep strata underground heat exchanger that interior caliber accounting can change with thermic load operating condition,
The operation energy consumption of circulating pump can be reduced as far as possible, system overall economy quality is improved on the basis of guaranteeing stable heating operation.
By the retrieval to patent document, patent document identical with present patent application is not found.
Summary of the invention
It is an object of the invention in place of overcome the deficiencies in the prior art, provide a kind of mid-deep strata that interior caliber accounting is variable
Underground heat exchanger is respectively nested structure from pipe, and convenient for construction down tube, and the interior caliber that can change mid-deep strata underground heat exchanger accounts for
Than reducing the operation energy consumption of circulating pump, improving economy；It is also possible to apply the invention to existing mid-deep strata underground heat exchanger heat supply systems
The upgrading of system, existing inner tube can be used as in old system continues to use from one of pipe, reduces initial cost.
The present invention solves its technical problem and is achieved through the following technical solutions:
A kind of mid-deep strata underground heat exchanger that interior caliber accounting is variable, it is characterised in that: same including main outer tube and main outer tube
The main inner tube of axle sleeve dress, coaxial sleeve is equipped with from pipe unit between the main outer tube and the main inner tube, described to include from pipe unit
The slave pipe of several coaxial packages, the main outer tube, main inner tube and is connected to from pipe unit one end, and the other end is respectively arranged with main outer tube
Interface, it is main in interface tube and from interface tube, the main outer tube interface is connected to the outlet of heat pump unit source, interface tube in the master
It is connected to heat pump unit source entrance, it is described that switching communicating pipe, institute are respectively connected with from several slave pipe fittings from pipe of pipe unit
It states and is provided with switching valve on switching communicating pipe, the outermost layer switching in the switching communicating pipe is connected to heat pump unit source communicating pipe
Side outlet, other switchings are connected to heat pump unit source entrance communicating pipe in the switching communicating pipe.
Moreover, described is 2 or more from the quantity of pipe from pipe unit.
Moreover, being provided with bypass pipe between any two root canal of the switching communicating pipe, it is provided on the bypass pipe
Bypass switching valve.
The advantages and positive effects of the present invention are:
1, coaxial sleeve is equipped with from pipe unit between main outer tube of the invention and the main inner tube, if described include from pipe unit
The slave pipe of dry coaxial package, main outer tube, main inner tube and from pipe unit one end be connected to, the other end be respectively arranged with main outer tube interface,
Interface tube and from interface tube in main, main outer tube interface are connected to the outlet of heat pump unit source, it is main in interface tube be connected to heat pump machine
Group source entrance, is respectively connected with switching communicating pipe from several slave pipe fittings from pipe of pipe unit, switches and is provided on communicating pipe
Switching valve, the outermost layer switching switched in communicating pipe are connected to the outlet of heat pump unit source communicating pipe, switch other in communicating pipe
Switching is connected to heat pump unit source entrance communicating pipe, can be changed in the heat exchanger of mid-deep strata underground by the adjusting of switching valve
Caliber accounting may be implemented to reduce the operation energy consumption of circulating pump as far as possible on the basis of guaranteeing stable heating operation, improve system
System overall economy quality.
2, of the invention from from the quantity of pipe being 2 or more in pipe unit, it can be achieved that caliber accounting in a variety of differences
Operating condition improves heat exchange efficiency, energy saving.
3, it is provided with bypass pipe between any two root canal of switching communicating pipe of the invention, bypass is provided on bypass pipe
The switching of the outer tube inlet of a variety of masters may be implemented in switching valve, convenient for sufficiently heat exchange, improves heat exchange efficiency.
4, it is of the invention from pipe unit it is several from pipe be nested structure, convenient for disposably lower pipe construction.
5, it present invention can be directly applicable to the upgrading of existing mid-deep strata underground heat exchanger heating system, in old system
Existing inner tube can be used as to be continued to use from one of pipe, reduces initial cost.
Detailed description of the invention
Fig. 1 is the installation working condition chart of present invention heat exchanger；
Fig. 2 is the structural schematic diagram of underground heat exchanger section in the present invention；
Fig. 3 is structural schematic diagram of the invention.
Description of symbols
The main outer tube of 1-, 2- first from pipe, 3- second from pipe, the main inner tube of 4-, the main outer tube interface of 5-, 6- first from interface tube,
7- second interface tube, 9- second out of interface tube, 8- master switch communicating pipe, the first switching valve of 10-, 11- bypass switching valve, 12-
Second switching valve, the outlet of 13-- heat pump unit source, 14- heat pump unit source entrance, 15- first switching communicating pipe, 16- bypass
Pipe.
Specific embodiment
Below by specific embodiment, the invention will be further described, and it is not limit that following embodiment, which is descriptive,
Qualitatively, this does not limit the scope of protection of the present invention.
Such as the installation working condition chart that Fig. 1 is this heat exchanger, this heat exchanger one end is extend into deep-well layer, other end setting exists
It is connect on ground and with heat pump unit source and carries out geothermal energy heat exchange.
Such as the visible the embodiment of the present invention of Fig. 2 and Fig. 3, a kind of knot for the mid-deep strata underground heat exchanger that interior caliber accounting is variable
Structure schematic diagram.
A kind of mid-deep strata underground heat exchanger that interior caliber accounting is variable, innovation are: outer including main outer tube 1 and master
The main inner tube 4 of pipe coaxial package, coaxial sleeve is equipped with from pipe unit between main outer tube and main inner tube, includes first from pipe from pipe unit
2 and second from pipe 3, and main outer tube, main inner tube, first are connected to from pipe one end from pipe and second and are located in the deep-well layer of ground lower end,
The other end be respectively arranged with main outer tube interface 5, it is main in interface tube 8, first from interface tube 6 and second from interface tube 7, main external pipe connection
Mouth, main interior interface tube, first rest on the ground from interface tube and second from interface tube, and main outer tube interface is connected to heat pump unit source
Side outlet 13, main interior interface tube are connected to heat pump unit source entrance 14, and first distinguishes from interface tube from interface tube and second
Be connected with first switching communicating pipe 15 and the second switching communicating pipe 9, switch be respectively arranged on communicating pipe the first switching valve 10 and
Second switching valve 12, the first switching are connected to the outlet of heat pump unit source communicating pipe, and the second switching is connected to heat pump machine communicating pipe
Group source entrance can change the interior caliber accounting of mid-deep strata underground heat exchanger by the adjusting of the first, second switching valve, can be with
It realizes on the basis of guaranteeing stable heating operation, reduces the operation energy consumption of circulating pump as far as possible, improve system overall economy quality.
It is provided with bypass pipe 16 between first switching communicating pipe and the second switching communicating pipe, bypass is provided on bypass pipe and cuts
Valve 11 is changed, the switching of the outer tube inlet of a variety of masters may be implemented, convenient for sufficiently heat exchange, improves heat exchange efficiency.
When main outer tube, first from pipe, second from the caliber of pipe, main inner tube be respectively 300mm, 200mm, 130mm, 90mm
When, realize that caliber accounting is as shown in table 1 (ignoring each thickness of pipe wall influences) in difference by the adjustment of switching valve.
The interior caliber accounting table of the different inner and outer pipes combinations of table 1
It can be calculated according to practical heating load and local geologic parameter in practical application optimal under different typical conditions
Design of heat exchanger and switching criterion design are carried out from pipe size, and with this.Switching, which can be used, manually controls the valves such as ball valve, gate valve
Manual switching is carried out, solenoid valve etc. can also be used and automatically switched.It can also be added based on weather forecast, human behavior prediction etc.
The load prediction system of influence, the heat load by time curve in one day to one week future of prediction, is cut by intelligent algorithm Automated Design
It changes scheme and automatically controls switching, utmostly to improve system performance driving economy.
Several in pipe unit in the present invention from pipe is nested structure, convenient for disposably lower pipe construction, and be may be directly applied to
The upgrading of existing mid-deep strata underground heat exchanger heating system, existing inner tube can be used as in old system continues from one of pipe
It uses, reduces initial cost.
Although disclosing the embodiment of the present invention and attached drawing for the purpose of illustration, those skilled in the art can be managed
Solution: do not departing from the present invention and spirit and scope of the appended claims in, various substitutions, changes and modifications be all it is possible,
Therefore, the scope of the present invention is not limited to the embodiment and attached drawing disclosure of that.
Claims (3)
1. a kind of variable mid-deep strata underground heat exchanger of interior caliber accounting, it is characterised in that: including main outer tube and main outer coaxial tube
The main inner tube of suit, coaxial sleeve is equipped with from pipe unit between the main outer tube and the main inner tube, if described include from pipe unit
The slave pipe of dry coaxial package, the main outer tube, main inner tube and is connected to from pipe unit one end, and the other end is respectively arranged with main external pipe connection
Mouthful, it is main in interface tube and from interface tube, the main outer tube interface is connected to the outlet of heat pump unit source, and interface tube connects in the master
It is connected to heat pump unit source entrance, described be respectively connected with from several slave pipe fittings from pipe of pipe unit switches communicating pipe, described
Switching valve is provided on switching communicating pipe, the outermost layer switching in the switching communicating pipe is connected to heat pump unit source communicating pipe
Outlet, other switchings are connected to heat pump unit source entrance communicating pipe in the switching communicating pipe.
2. the variable mid-deep strata underground heat exchanger of interior caliber accounting according to claim 1, it is characterised in that: described from pipe
In unit from the quantity of pipe be 2 or more.
3. the variable mid-deep strata underground heat exchanger of interior caliber accounting according to claim 1, it is characterised in that: the switching
It is provided with bypass pipe between any two root canal of communicating pipe, bypass switching valve is provided on the bypass pipe.
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| CN201910428345.XA CN110207408A (en) | 2019-05-22 | 2019-05-22 | A kind of mid-deep strata underground heat exchanger that interior caliber accounting is variable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910428345.XA CN110207408A (en) | 2019-05-22 | 2019-05-22 | A kind of mid-deep strata underground heat exchanger that interior caliber accounting is variable |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2823922Y (en) * | 2005-07-19 | 2006-10-04 | 韩统 | Geothermal exchanger with internal and external pipes |
| US20150122453A1 (en) * | 2013-11-06 | 2015-05-07 | Controlled Thermal Technologies Pty Ltd | Geothermal loop in-ground heat exchanger for energy extraction |
| CN107514838A (en) * | 2017-09-29 | 2017-12-26 | 上海中金能源投资有限公司 | Mid-deep strata geothermal-source heat pump system |
| US20180283735A1 (en) * | 2017-03-30 | 2018-10-04 | China University Of Petroleum-Beijing | Hydrothermal geothermal development method of multilateral well closed circulation |
| CN208154861U (en) * | 2018-03-30 | 2018-11-27 | 张雨 | A kind of more inclined shaft connection underground heat heat-exchange systems |
| CN210292396U (en) * | 2019-05-22 | 2020-04-10 | 天津大学 | Middle-deep-layer underground heat exchanger with variable inner pipe diameter ratio |
-
2019
- 2019-05-22 CN CN201910428345.XA patent/CN110207408A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2823922Y (en) * | 2005-07-19 | 2006-10-04 | 韩统 | Geothermal exchanger with internal and external pipes |
| US20150122453A1 (en) * | 2013-11-06 | 2015-05-07 | Controlled Thermal Technologies Pty Ltd | Geothermal loop in-ground heat exchanger for energy extraction |
| US20180283735A1 (en) * | 2017-03-30 | 2018-10-04 | China University Of Petroleum-Beijing | Hydrothermal geothermal development method of multilateral well closed circulation |
| CN107514838A (en) * | 2017-09-29 | 2017-12-26 | 上海中金能源投资有限公司 | Mid-deep strata geothermal-source heat pump system |
| CN208154861U (en) * | 2018-03-30 | 2018-11-27 | 张雨 | A kind of more inclined shaft connection underground heat heat-exchange systems |
| CN210292396U (en) * | 2019-05-22 | 2020-04-10 | 天津大学 | Middle-deep-layer underground heat exchanger with variable inner pipe diameter ratio |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Yang Inventor after: Zhao Jun Inventor after: Xu Wenjie Inventor after: Ma Ling Inventor before: Zhao Jun Inventor before: Li Yang Inventor before: Xu Wenjie Inventor before: Ma Ling |