CN115218261A - Medium-deep geothermal direct energy supply system based on ion removal - Google Patents
Medium-deep geothermal direct energy supply system based on ion removal Download PDFInfo
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- CN115218261A CN115218261A CN202110420342.9A CN202110420342A CN115218261A CN 115218261 A CN115218261 A CN 115218261A CN 202110420342 A CN202110420342 A CN 202110420342A CN 115218261 A CN115218261 A CN 115218261A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 145
- 238000010438 heat treatment Methods 0.000 claims abstract description 89
- 239000012530 fluid Substances 0.000 claims abstract description 63
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 238000011033 desalting Methods 0.000 claims abstract description 14
- 238000011161 development Methods 0.000 claims abstract description 6
- 238000001223 reverse osmosis Methods 0.000 claims description 28
- 238000010612 desalination reaction Methods 0.000 claims description 18
- 238000011001 backwashing Methods 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000000746 purification Methods 0.000 description 14
- 150000002500 ions Chemical class 0.000 description 13
- 230000033558 biomineral tissue development Effects 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Classifications
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- 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
- F24D15/00—Other domestic- or space-heating systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- 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
- F24D19/00—Details
- F24D19/0092—Devices for preventing or removing corrosion, slime or scale
-
- 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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/11—Geothermal energy
-
- 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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/04—Sensors
- F24D2220/042—Temperature sensors
-
- 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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/04—Sensors
- F24D2220/044—Flow sensors
-
- 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
Abstract
The invention discloses a middle-deep geothermal direct energy supply system based on ion removal, which comprises: the system comprises a filtering module, a desalting module and a heat exchange module; the desalting module comprises a geothermal fluid inlet, a desalting geothermal fluid outlet and a geothermal tail water outlet, the geothermal fluid inlet is connected to the geothermal development well through the filtering module, and the desalting geothermal fluid outlet is connected to an inlet of a user side; the heat exchange module comprises a heating side and a heating side, a geothermal tail water outlet is connected to an inlet of the heating side, and an outlet of the heating side is connected to the geothermal fluid recharging well; the user side comprises a first outlet and a second outlet, the first outlet is connected to the geothermal fluid recharging well, the second outlet is connected to the inlet of the heating side of the heat exchange module, and the outlet of the heating side is connected to the inlet of the user side. The invention expands the temperature range of geothermal resource utilization, reduces the energy and temperature loss generated by the traditional indirect heat exchange mode, and avoids the corrosion and scaling of the heating pipe network and the heating tail end of the user.
Description
Technical Field
The invention belongs to the technical field of geothermal energy utilization, and particularly relates to a medium-deep geothermal direct energy supply system based on ion removal.
Background
The medium-deep geothermal resources are mainly medium-low temperature hydrothermal geothermal resources, have the characteristics of wide distribution, huge reserves, low development and utilization difficulty and the like, and become an accepted novel renewable energy source.
The temperature and the mineralization degree of geothermal resources are generally higher, and the geothermal resources are easy to generate more obvious corrosion and scaling on metal materials, so that the high-efficiency and safe operation of a heating system is influenced. At present, the technical route of indirect heat exchange between geothermal fluid and a heating circulating medium is mainly adopted in the field of geothermal heating, the geothermal fluid and the heating circulating water are isolated to exchange energy, the corrosion and scaling of a user side heating pipe network and a tail end radiator are prevented through indirect heat exchange, certain energy and temperature loss can be generated in the process, and the potential of geothermal fluid resources cannot be fully exploited and utilized. Especially for geothermal resources with the temperature close to that of a heating medium, the required heating temperature cannot be ensured due to temperature level loss caused by indirect heat exchange, so that the operation cost is greatly increased due to the fact that the geothermal resources are matched with a heat pump to raise the temperature.
Therefore, the direct energy supply system for the intermediate-deep geothermal heat based on ion desorption is expected to be developed, so that geothermal resources can be directly utilized, the potential of geothermal fluid resources is fully exploited and utilized, the energy and temperature loss is reduced, and the heating temperature is ensured.
Disclosure of Invention
The invention aims to solve the problems that the high mineralization degree of medium-deep and low-temperature geothermal resources easily causes corrosion and scaling, the traditional indirect heat exchange is easy to generate energy and temperature loss, and particularly, geothermal resources with the temperature close to that of a heating medium cannot be directly utilized.
In order to achieve the above object, the present invention provides an intermediate geothermal direct energy supply system based on ion removal, comprising: the device comprises a filtering module, a desalting module and a heat exchange module;
the desalination module comprises a geothermal fluid inlet, a desalination geothermal fluid outlet and a geothermal tail water outlet, the geothermal fluid inlet is connected to the geothermal development well through the filtration module, and the desalination geothermal fluid outlet is connected to an inlet of a user end;
the heat exchange module comprises a heating side and a heating side, the geothermal tail water outlet is connected to the inlet of the heating side, and the outlet of the heating side is connected to the geothermal fluid recharging well;
the user side comprises a first outlet and a second outlet, the first outlet is connected to the geothermal fluid recharging well, the second outlet is connected to an inlet of a heating side of the heat exchange module, and an outlet of the heating side is connected to an inlet of the user side.
Optionally, the desalination module comprises a booster pump and a reverse osmosis water purifier, the reverse osmosis water purifier comprises the geothermal fluid inlet, the desalination geothermal fluid outlet and the geothermal tail water outlet, and the filtration module is connected to the geothermal fluid inlet through the booster pump.
Optionally, the reverse osmosis water purification unit comprises a reverse osmosis membrane assembly, a backwashing device and a control system, the backwashing device is connected to the reverse osmosis membrane assembly through a pipeline, the control system is electrically connected with the reverse osmosis membrane assembly and the backwashing device, and the booster pump comprises a first pump and a second pump.
Optionally, the desalted geothermal fluid outlet and the outlet of the heating side are connected to the inlet of the user side through a water transfer pump or an ejector.
Optionally, the water transfer pump or eductor comprises a one-use-one-standby.
Optionally, the filtering module comprises a water feeding pump, a filter and a fine filter which are connected in sequence, a water inlet of the water feeding pump is connected to the geothermal exploitation well, a water outlet of the fine filter is connected to the desalination module, and a backwashing pump is arranged on the filter.
Optionally, the water feed pump comprises a one-use one-standby.
Optionally, the heat exchange module includes a heat exchanger, a temperature measuring device and a flow adjusting device, the temperature measuring device, the heat exchanger includes the heating side and the heating side, the temperature measuring device is used for measuring the water temperature of the heating side, and the flow adjusting device is used for controlling the water flow of the heating side.
Optionally, the system further comprises a raw water tank, a water inlet of the raw water tank is connected to the geothermal exploitation well through a desander, and a water outlet of the raw water tank is connected to the filtering module.
Optionally, the geothermal energy recharging system further comprises a water mixing tank, a water outlet of the water mixing tank is connected to the geothermal recharging well through a restrictor, and a heating side outlet of the heat exchange module and a first outlet of the user side are connected to a water inlet of the water mixing tank.
The invention has the beneficial effects that: the intermediate-deep geothermal direct energy supply system based on ion removal can directly utilize low-temperature geothermal resources, expand the available temperature range of the geothermal resources, reduce energy and temperature loss generated by the traditional indirect heat exchange mode, avoid corrosion and scaling of a heating pipe network and the heating tail end of a user, and avoid the increase of operation cost caused by depending on temperature rise of a heat pump.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic diagram of a mid-deep geothermal direct energy supply system based on ion removal according to one embodiment of the invention.
Fig. 2 shows a schematic diagram of a system for intermediate geothermal direct energy supply based on ion removal according to an embodiment of the invention.
Description of the reference numerals
1. A geothermal development well; 2. a deep well pump; 3. a desander; 4. a raw water tank; 5. feeding a water pump; 6. a backwash pump; 7. a filter; 8. a fine filter; 9. a booster pump; 10. a reverse osmosis water purification unit; 11. a water delivery pump; 12. a heat exchanger; 13. a water mixing tank; 14. a throttling device; 15. a geothermal recharging well; 16. an ejector; 17. and a user side.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
The invention discloses a medium-deep geothermal direct energy supply system based on ion removal, which comprises: the device comprises a filtering module, a desalting module and a heat exchange module;
the desalting module comprises a geothermal fluid inlet, a desalting geothermal fluid outlet and a geothermal tail water outlet, the geothermal fluid inlet is connected to the geothermal development well through the filtering module, and the desalting geothermal fluid outlet is connected to an inlet of a user side;
the heat exchange module comprises a heating side and a heating side, a geothermal tail water outlet is connected to an inlet of the heating side, and an outlet of the heating side is connected to the geothermal fluid recharging well;
the user side comprises a first outlet and a second outlet, the first outlet is connected to the geothermal fluid recharging well, the second outlet is connected to the inlet of the heating side of the heat exchange module, and the outlet of the heating side is connected to the inlet of the user side.
Specifically, the invention can directly utilize low-temperature geothermal resources, expand the available temperature range of the geothermal resources, break through the limitation that the geothermal resources can not directly supply energy, exploit the resource potential of the geothermal resources, reduce the energy and temperature loss generated by the traditional indirect heat exchange mode, avoid the increase of the operation cost caused by the temperature rise of a heat pump, and avoid the corrosion and scaling of the heating pipe network and the heating tail end of a user;
the invention can fully excavate the residual temperature and residual pressure resource potential of the system and ensure that the geothermal fluid can be economically and directly used in energy supply service.
As an alternative scheme, the desalination module comprises a booster pump and a reverse osmosis water purification unit, the reverse osmosis water purification unit comprises a geothermal fluid inlet, a desalination geothermal fluid outlet and a geothermal tail water outlet, and the filtration module is connected to the geothermal fluid inlet through the booster pump.
Specifically, the pressure provided by the booster pump is used as a driving force, geothermal water passes through the reverse osmosis water purification unit, so that the reverse osmosis water purification unit separates water molecules from solutes in a water body, desalination is realized, the mineralization degree of the geothermal fluid in a middle and deep layer is reduced, and corrosive and scaling ions are removed; the filtering module is arranged in front of the reverse osmosis water purification unit, so that impurities with large diameters in geothermal water can be removed, and the burden of the reverse osmosis water purification unit is reduced.
As an alternative scheme, the reverse osmosis water purification unit comprises a reverse osmosis membrane assembly, a backwashing device and a control system, the backwashing device is connected to the reverse osmosis membrane assembly through a pipeline, the control system is electrically connected with the reverse osmosis membrane assembly and the backwashing device, and the booster pump comprises a first pump and a second pump.
Specifically, in order to prevent the failure of the booster pump and improve the working efficiency of the whole system, the booster pump is arranged to be one-used and two-standby.
Alternatively, the desalted geothermal fluid outlet and the outlet of the heating side are connected to the inlet of the user side through a water transfer pump or an ejector.
Specifically, the water delivery pump or the ejector can provide injection power for the desalted geothermal fluid, so that the heating of a user side is ensured;
the ejector is adopted to convert potential energy of the high-pressure desalting geothermal fluid into kinetic energy, so that the flow resistance of subsequent heating circulating water can be overcome, and meanwhile, vacuum generated by the high-pressure desalting geothermal fluid can be used as driving force to suck part of heating return water, which absorbs heat energy of high-concentration geothermal tail water, on the heating side of the heat recovery and exchange module, so that two fluids are mixed to provide heating for a user, and the heating circulating energy consumption is further saved.
Alternatively, the water transfer pump or eductor includes a backup pump or eductor.
Specifically, the backup device is arranged, so that system shutdown caused by equipment failure can be prevented, and continuous heating of the user side is guaranteed.
As an alternative scheme, the filtering module comprises a water feeding pump, a filter and a fine filter which are sequentially connected, a water inlet of the water feeding pump is connected to the geothermal exploitation well, a water outlet of the fine filter is connected to the desalting module, and a backwashing pump is arranged on the filter.
Specifically, set gradually filter and smart filter, filter the impurity of geothermol power aquatic step by step, guarantee the filter effect, reduce the operating pressure of low reaches desalination module, avoid low reaches equipment jam trouble.
Alternatively, the water feed pump comprises a one-use one-standby water pump.
As an alternative scheme, the heat exchange module comprises a heat exchanger, a temperature measuring device and a flow regulating device, the temperature measuring device comprises a heating side and a heating side, the temperature measuring device is used for measuring the water temperature of the heating side, and the flow regulating device is used for controlling the water flow of the heating side.
Specifically, through setting up temperature measuring device and flow regulator, cooperation control system can adjust the geothermol power tail water entering flow of heating side through the temperature of heating side, can guarantee the make full use of geothermol power resource, can avoid again that the heat transfer temperature is not up to standard.
As an alternative scheme, the system also comprises a raw water tank, wherein a water inlet of the raw water tank is connected to the geothermal exploitation well through a desander, and a water outlet of the raw water tank is connected to the filtering module.
Specifically, the raw water tank is arranged, so that geothermal water in the geothermal exploitation well is collected into the raw water tank through the deep well pump to be stabilized and precipitated, and subsequent work is facilitated.
As an alternative scheme, the system further comprises a water mixing tank, a water outlet of the water mixing tank is connected to the geothermal recharging well through a throttler, and a heating side outlet of the heat exchange module and a first outlet of the user side are connected to a water inlet of the water mixing tank.
Specifically, the water mixing tank is arranged, so that the desalted geothermal fluid separated by the desalting module and the geothermal tail water can be fully mixed, the geothermal water component is reduced, and the geothermal reservoir is prevented from being damaged.
Examples
Fig. 1 shows a schematic diagram of a medium-deep geothermal direct energy supply system based on ion removal according to the embodiment; fig. 2 shows a schematic diagram of the intermediate-deep geothermal direct energy supply system based on ion removal of the embodiment.
As shown in fig. 1, the system for directly supplying energy to geothermal energy in middle and deep layers based on ion removal of the present embodiment includes a geothermal exploitation well 1, a deep well pump 2, a desander 3, a raw water tank 4, a water feeding pump 5, a backwashing pump 6, a filter 7, a fine filter 8, a booster pump 9, a reverse osmosis water purification unit 10, a water delivery pump 11, a heat exchanger 12, a water mixing tank 13, a throttling device 14, a geothermal recharging well 15, and a user terminal 17;
geothermal fluid in the geothermal exploitation well 1 is conveyed to a raw water tank 4 for accumulation, sedimentation and flow stabilization through a desander 3 under the action of a deep well pump 2; the geothermal fluid in the raw water tank 4 is driven by the water feeding pump 5 to enter the filter 7 and the fine filter 8 in sequence to remove impurities and bacteria in water, the fluid pressure is increased to the operating pressure of the reverse osmosis water purification unit 10 through the booster pump 9, and the fluid enters the reverse osmosis water purification unit 10; the backwashing pump 6 is periodically started to carry out online cleaning on the filter 7;
the geothermal fluid in the reverse osmosis machine water purification unit 10 is processed into desalted geothermal fluid and high-concentration geothermal tail water which can be directly utilized according with relevant water quality standards, the desalted geothermal fluid is directly sent to a user end 17 through a water transfer pump 11 to provide energy supply service for the user end 17, heating backwater of the user end 17 comprises a first outlet and a second outlet, the heating backwater discharged from the first outlet enters a mixed water tank 13, the heating backwater discharged from the second outlet enters an inlet on the heating side of a heat exchanger 12, the heating backwater passes through the outlet on the heating side of the heat exchanger 12 to be converged with the desalted geothermal fluid discharged from the reverse osmosis water purification unit 10 and is sent to the user end 17 through the water transfer pump 11, the water transfer pump 11 realizes mixed water conveying of the two fluids, and the pressure of the fluids is fully recycled;
high-concentration geothermal tail water enters the heating side of the heat exchanger 12 to exchange heat with heating side heating return water, heat energy in the high-concentration geothermal tail water is fully utilized, and the geothermal tail water after heat exchange is discharged into mixed water 13;
after the high-concentration geothermal tail water after heat exchange and most of heating backwater are mixed in the water mixing tank 13, the mixed water is injected into the geothermal recharging well 15 through the throttling device 14 to complete heating circulation, and the throttling device 14 is arranged to adjust the flow of fluid according to recharging pressure.
The geothermal exploitation well 1 and the geothermal recharging well 15 are optimized according to geological conditions, and the well body structure is not limited to two openings and three openings;
the heat exchanger 12 plays a role in recovering heat energy of high-concentration geothermal tail water, the heat exchanger 12 comprises a temperature measuring device and a flow regulating device, the temperature measuring device is used for measuring water temperature of a heating side, the flow regulating device is used for controlling water flow of the heating side, and a controller is arranged in a matched mode to regulate the inlet flow of the geothermal tail water of the heating side according to the outlet water temperature of the heating side;
wherein, the user terminal 17 can be the terminal of fan coil, floor heating, radiator, etc. in the building;
wherein, the water feeding pump 5 comprises a first use and a first spare, the booster pump 9 comprises a first use and a second spare, and the water delivery pump 11 comprises a first use and a first spare.
As shown in fig. 2, the ejector 16 may be used to replace the water delivery pump 11, to convert potential energy of the high-pressure desalination geothermal fluid into kinetic energy, to overcome the flow resistance of the subsequent heating circulating water, and simultaneously, to suck part of the heating return water, which is sucked into the heating side of the heat exchanger to recover the heat energy of the high-concentration geothermal tail water, by using vacuum generated by the high-pressure desalination geothermal fluid as driving force, to mix the two fluids to provide heat for the user, thereby further saving the energy consumption of heating circulation.
The invention can directly utilize low-temperature medium-deep geothermal resources, reduce the mineralization degree of the medium-deep geothermal fluid, remove corrosion and scaling ions, expand the available temperature range of the geothermal resources, effectively solve the bottleneck of the application of a geothermal resource direct energy supply system, avoid the corrosion and scaling of the heating pipe network and the heating tail end of a user, and break through the limitation that the geothermal resources have larger influence on the corrosion and scaling of equipment and pipelines and cannot directly supply energy; secondly, the invention can reduce the energy and temperature loss in the traditional indirect heat exchange process, excavate the potential of geothermal resource resources, particularly can directly utilize geothermal resources with the temperature close to the temperature of a heating medium in a larger proportion, and avoid the increase of the operation cost caused by depending on the temperature rise of a heat pump; thirdly, the design of the water delivery pump, the heat exchanger and the throttling device in the invention fully combines the characteristics of geothermal energy supply, and the waste heat and the residual pressure of the high-concentration geothermal tail water and the fluid which can be directly utilized and accords with the relevant water quality standard can be recovered according to the requirement, thereby greatly reducing the operating cost of the system; finally, due to the good integration of the system, the investment of the system is low, and the system has good contrast advantages with the traditional geothermal energy supply system and other forms, and has good market prospect.
While embodiments of the present invention have been described above, the above description is illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A middle and deep geothermal direct energy supply system based on ion removal is characterized by comprising: the system comprises a filtering module, a desalting module and a heat exchange module;
the desalination module comprises a geothermal fluid inlet, a desalination geothermal fluid outlet and a geothermal tail water outlet, the geothermal fluid inlet is connected to the geothermal development well through the filtering module, and the desalination geothermal fluid outlet is connected to an inlet of a user end;
the heat exchange module comprises a heating side and a heating side, the geothermal tail water outlet is connected to the inlet of the heating side, and the outlet of the heating side is connected to the geothermal fluid recharging well;
the user side comprises a first outlet and a second outlet, the first outlet is connected to the geothermal fluid recharging well, the second outlet is connected to an inlet of a heating side of the heat exchange module, and an outlet of the heating side is connected to an inlet of the user side.
2. The system for middle-deep geothermal direct energy supply based on ion removal according to claim 1, wherein the desalination module comprises a booster pump and a reverse osmosis water purifier, the reverse osmosis water purifier comprises the geothermal fluid inlet, the desalination geothermal fluid outlet and the geothermal tail water outlet, and the filtration module is connected to the geothermal fluid inlet through the booster pump.
3. The system for directly supplying energy to geothermal energy at a medium and deep layer based on ion removal as claimed in claim 2, wherein the reverse osmosis water purifier set comprises a reverse osmosis membrane module, a backwashing device and a control system, the backwashing device is connected to the reverse osmosis membrane module through a pipeline, the control system is electrically connected to the reverse osmosis membrane module and the backwashing device, and the booster pump comprises a first pump and a second pump.
4. The deep geothermal direct energy supply system based on ion removal according to claim 1, wherein the desalted geothermal fluid outlet and the outlet of the heating side are connected to the inlet of the user side through a water transfer pump or an ejector.
5. The system of claim 4, wherein the water pump or the ejector comprises a backup pump or a backup pump.
6. The system for middle-deep geothermal direct energy supply based on ion removal according to claim 1, wherein the filtering module comprises a water feeding pump, a filter and a fine filter which are connected in sequence, the water inlet of the water feeding pump is connected to the geothermal exploitation well, the water outlet of the fine filter is connected to the desalination module, and the filter is provided with a backwashing pump.
7. The system of claim 6, wherein the water pump comprises a backup pump.
8. The system of claim 1, wherein the heat exchange module comprises a heat exchanger, a temperature measuring device and a flow regulating device, the temperature measuring device is used for measuring the temperature of water on the heating side, the heat exchanger comprises the heating side and the heating side, and the flow regulating device is used for controlling the flow of water on the heating side.
9. The system for intermediate-deep geothermal direct power supply based on ion removal according to claim 1, further comprising a raw water tank, wherein a water inlet of the raw water tank is connected to the geothermal exploitation well through a desander, and a water outlet of the raw water tank is connected to the filter module.
10. The system for deep geothermal direct power supply based on ion removal according to claim 1, further comprising a water mixing tank, wherein a water outlet of the water mixing tank is connected to the geothermal recharging well through a restrictor, and a heating side outlet of the heat exchange module and a first outlet of the user side are connected to a water inlet of the water mixing tank.
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| CN202110420342.9A CN115218261B (en) | 2021-04-19 | Middle-deep geothermal energy direct energy supply system based on ion removal |
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| CN202110420342.9A CN115218261B (en) | 2021-04-19 | Middle-deep geothermal energy direct energy supply system based on ion removal |
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