CN110542143A - Medium-deep geothermal energy collection same-well pumping-back system - Google Patents
Medium-deep geothermal energy collection same-well pumping-back system Download PDFInfo
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- CN110542143A CN110542143A CN201910883901.2A CN201910883901A CN110542143A CN 110542143 A CN110542143 A CN 110542143A CN 201910883901 A CN201910883901 A CN 201910883901A CN 110542143 A CN110542143 A CN 110542143A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 278
- 238000001914 filtration Methods 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000000605 extraction Methods 0.000 claims abstract description 31
- 238000005086 pumping Methods 0.000 claims abstract description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000006004 Quartz sand Substances 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims description 27
- 239000000945 filler Substances 0.000 claims description 21
- 238000011001 backwashing Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000012856 packing Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000011010 flushing procedure Methods 0.000 claims description 11
- 238000000746 purification Methods 0.000 claims description 10
- 238000004062 sedimentation Methods 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000003306 harvesting Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000006213 oxygenation reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003673 groundwater Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
- B01D24/12—Downward filtration, the filtering material being supported by pervious surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
-
- 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
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
-
- 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
-
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a middle-deep geothermal energy collection same-well pumping system, which comprises a collection well and a heat exchange assembly, wherein the collection well is connected with the heat exchange assembly; the collecting well comprises a well body, the well body comprises a heat energy extraction area at the lower part and a recharge area at the upper part, a sealing device is arranged at the adjacent position between the heat energy extraction area and the recharge area, a through hole for penetrating through a water pumping pipe is arranged at the center of the sealing device, the lower end of the water pumping pipe extends into the heat energy extraction area, and a submersible pump for pumping geothermal water is connected to the lower end of the water pumping pipe; a quartz sand filter material layer is filled between the outer side of a well pipe and the inner wall of a well hole in the reinjection area; the heat exchange assembly comprises a filtering and purifying device and a heat exchanger. The invention adopts the collecting well with the functions of pumping water and returning water to collect and utilize the heat in the geothermal water of the middle-deep layer, but does not consume geothermal water, and the geothermal water after heat exchange has high recharging rate, thus not causing the reduction of the underground water level and the change and the damage of the geological structure. The invention has small floor area, convenient construction and maintenance, lower cost and higher resource utilization rate.
Description
Technical Field
The invention relates to the technical field of geothermal energy collection, in particular to a middle-deep layer geothermal energy collection same-well pumping-back system.
Background
In recent years, the problem of air pollution in China is increasingly severe, the regional air environment problem taking inhalable particles (PM 10) and fine particles (PM 2.5) as characteristic pollutants is particularly prominent, and meanwhile, along with the deep promotion of industrialization and urbanization in China, the energy resource consumption is continuously increased, and the pressure for preventing and controlling the air pollution is continuously increased.
The method for heating rooms or commercial occasions by utilizing the heat energy of the underground water source is a clean energy heating mode, is widely applied in recent years, and has some problems in the energy acquisition system of the existing water source heat pump central air conditioner: 1. the method generally adopts a one-pumping multi-return mode collection well, and has the defects that the underground water level is reduced due to incomplete recharging after long-term use, sand removal is generated during use, and adverse effects such as geological collapse and the like are easily caused after long-term use; 2. a buried pipe soil heat exchanger system is generally adopted, and the defects of large occupied area and high cost are overcome; 3. generally, shallow geothermal energy is used as a heat source, the extracted heat is 15-18 ℃, the heat source conversion rate is not high, and the heating effect is not ideal.
Disclosure of Invention
the invention aims to solve the technical problem of providing a middle-deep geothermal energy collecting same-well pumping-back system, which adopts a collecting well with pumping and water-returning functions, pumps geothermal water for heat exchange to provide heat for a heating pipe network, and the geothermal water after heat exchange flows back into the collecting well, so that the system has the advantages of good heat supply effect, high recharging rate, no damage to a geological structure, energy conservation and environmental protection.
In order to solve the technical problems, the invention adopts the following technical scheme:
Designing a middle-deep geothermal energy collection same-well pumping system, which comprises a collection well and a heat exchange assembly;
The collecting well comprises a well body, the well body comprises a heat energy extraction area at the lower part and a recharge area at the upper part, the diameter of a well hole of the heat energy extraction area is smaller than that of a well hole of the recharge area, a sealing device is arranged at the adjacent position between the heat energy extraction area and the recharge area, the sealing device comprises a bearing steel plate and a sealing rubber plate fixedly arranged on the lower surface of the bearing steel plate, and the sealing device is arranged at the top of the well hole of the heat energy extraction area; a through hole for penetrating through a water pumping pipe is formed in the center of the bearing steel plate, the lower end of the water pumping pipe extends into the heat energy extraction area, and a submersible pump for pumping geothermal water is connected to the lower end of the water pumping pipe; a quartz sand filter material layer is filled between the outer side of a well pipe of the reinjection area and the inner wall of a well hole;
The heat exchange assembly comprises a filtering and purifying device and a heat exchanger, the water pumping pipe is communicated with the water inlet pipe of the filtering and purifying device, the water outlet pipe of the filtering and purifying device is communicated with the water inlet of the heat exchanger, the heat exchanger is connected into a heating pipe network, the water outlet of the heat exchanger is connected with a water return pipe, the water outlet end of the water return pipe extends to the interior of the recharge area, and geothermal water after heat exchange flows back to the recharge area through the water return pipe.
According to the technical scheme, the interior of a well body of one collection well is divided into a heat energy extraction area at the lower part and a recharge area at the upper part, geothermal water in a middle-deep layer is extracted from the heat energy extraction area, the extracted geothermal water flows out through a water pumping pipe and is filtered by a filtering and purifying device, then heat exchange is carried out through a heat exchanger (such as a plate heat exchanger), the heat exchanger is connected into a heating pipe network to provide heat for the heating pipe network, the geothermal water after heat exchange flows back to the recharge area through a closed water return pipeline, a quartz sand filter material is filled between a well pipe and the inner wall of a well hole in the recharge area, and the functions of water filtration and heat storage are achieved, so that the recharge geothermal water is subjected to heat exchange with underground water and. A sealing device is arranged between the heat energy extraction area and the recharge area to effectively separate the heat energy extraction area from the recharge area, geothermal water in the recharge area cannot enter the heat energy extraction area, and the influence of recharge water on the water quality and the water temperature of the heat energy extraction area can be avoided; the geothermal water that extracts can filter through filtering purification device earlier before carrying out the heat transfer, can avoid the mineral substance that deep aquatic contains to pollute shallow layer water such as manganese, iron, sulphur, plays the effect of protection indirect heating equipment and pipeline simultaneously.
Preferably, the filtering and purifying device comprises a tank body with an opening at the top, a water inlet pipe and a water outlet pipe, and a frosted filter material layer, a quartz sand filter material layer and a PVC water pouring filler layer are sequentially arranged in the tank body from bottom to top; uniformly distributed air inlet holes are formed in the side wall of the tank body in the area corresponding to the PVC water-spraying packing layer, and an oxygen adding fan for exhausting air upwards is arranged at the opening at the top of the tank body; a water retaining groove is arranged at the position of the side wall of the tank body, which covers the air inlet hole area;
The water inlet pipe extends to the inside of the tank body and is positioned above the PVC water spraying packing layer, a plurality of water outlet pipe heads are uniformly distributed on the part of the water inlet pipe positioned in the tank body, and a water inlet valve is arranged on the water inlet pipe; the water outlet is formed in the bottom of the tank body and is connected with a water outlet pipe, and a water outlet valve is arranged on the water outlet pipe.
After the middle-deep groundwater is pumped up, the groundwater enters the filtering and purifying device through the water inlet pipe, and flows in from the upper part of the tank body, the water inlet pipe adopts a plurality of water outlet pipe heads to realize shunting, and a plurality of pipe heads simultaneously discharge water and disperse water flow, so that the water flow is fully contacted with the PVC water spraying packing layer, and preliminary filtration is realized. Water flows downwards along gaps of the PVC water spraying filler, and meanwhile, under the action of the upper oxygen adding fan, outside air enters the PVC water spraying filler layer part in the tank body through the air inlet hole and is then pumped out by the upper fan, oxygen in the air and the water flow are fully contacted to play an oxidation role, and minerals in geothermal water are more easily filtered subsequently under the oxidation role. The water flowing downwards passes through the quartz sand filter material layer and the frosted filter material layer in sequence to realize further filtration, and the filtered water flows to subsequent heat exchange equipment through the lower water outlet pipe. When rivers pass through PVC trickle filler layer part, some water probably spatters jar external portion through the inlet port, through set up the manger plate groove on jar external wall, can avoid this partial rivers to jar external portion influence other equipment, also avoids wasting water resources, and the manger plate groove can be collected the water of spill and flow back to jar internal again.
Preferably, the filtering and purifying device further comprises a back washing pipe, one end of the back washing pipe is connected with the water inlet pipe, the connection position of the back washing pipe is located in front of the water inlet valve, the other end of the back washing pipe is connected with the water outlet at the bottom of the tank body, and a washing valve is arranged on the back washing pipe and used for enabling back washing water to enter the tank body from the water outlet at the bottom; a water outlet is formed in the side wall of the tank body between the PVC water-spraying filler layer and the quartz sand filter material layer, the water outlet is connected with a water discharge pipe, and a water discharge valve is arranged on the water discharge pipe and used for discharging back washing water; the drain pipe is communicated to an external sedimentation tank.
The tank body can be periodically back-flushed, at the moment, a water source enters through a water outlet at the lower part, flows in the tank body from bottom to top, and carries out back flushing on the frosting filter material layer and the quartz sand filter material layer, wherein impurities flow upwards along with water flow and are discharged to an external sedimentation tank through a water discharge pipe, and after sedimentation, subsequent treatment and discharge are carried out.
Preferably, the bottom surface of the water retaining groove is annular and is connected with the outer wall of the tank body, and the side surface of the water retaining groove surrounds the circumference of the side wall of the tank body and is higher than the air inlet hole area; and a backflow hole is formed in the side wall of the tank body and is close to the bottom of the inner side of the water retaining groove.
The water collected in the water retaining groove can flow back to the tank body through the air inlet, and a backflow hole with a larger aperture can be arranged to prevent the air inlet of the air inlet from being influenced or prevent the water from flowing smoothly due to the smaller aperture of the air inlet, so that the water in the water retaining groove can flow back to the tank body smoothly.
Preferably, the PVC water sprinkling packing layer is composed of a plurality of vertical PVC water sprinkling sheets which are arranged in parallel, and the PVC water sprinkling sheets are in an S-wave shape.
Preferably, a filler baffle is arranged at the bottom of the frosting filter material layer, and water permeable holes are distributed in the filler baffle; the filler baffle is provided with a water permeable groove which protrudes upwards and has a downward opening, and water permeable holes are uniformly distributed on the side wall and the top surface of the water permeable groove.
preferably, the sealing rubber plate is fastened with the bearing steel plate through a fixing bolt.
preferably, the quartz sand filter material layer is formed by filling a quartz sand filter material with the diameter of 2-4 mm.
Preferably, the depth of the well body of the collecting well is more than 1000 meters; the recharge area is located at a position between 100 and 500 meters.
Preferably, the well pipe of the recharge area is a bridge type strainer.
Preferably, the diameter of the well bore of the recharge area is 600mm, and the diameter of the well pipe of the recharge area is 300 mm.
Preferably, the diameter of a well hole of a region with the depth of 500-1000 meters in the heat energy extraction zone is 300mm, the well pipe is a spiral pipe with the thickness of 250mm, and water is not taken from the region; the water taking area is located in an area with the depth of more than 1000 meters, the diameter of a well hole is 250mm, water is taken from cracks of the bedrock, and a well pipe does not need to be placed.
The invention has the beneficial effects that:
1. the invention relates to a clean energy heating mode for heating rooms or commercial occasions by using underground middle-deep layer heat energy as energy, which is mainly used for collecting geothermal water heat in strata below 800 meters and heating buildings. The collecting well can return water while extracting heat, only collects energy in the underground water of a middle-deep layer, does not consume the underground water, extracts the geothermal water and returns to the well after heat exchange of an external heat exchange device, the recharge rate is close to 100 percent, and the collecting well does not have high temperature and high pressure in operation and does not have sand deposition in long-term operation.
2. the system is characterized in that the system is connected with a purifying and filtering device in series through pipelines, mineral substances such as manganese, iron, sulfur and the like contained in deep water can be filtered, the filtering and purifying device adopts an integrated design and a structure of sequential multiple filtration, a PVC water spraying packing layer is adopted for preliminary filtration, a plurality of water outlet pipe heads disperse water flow, the contact range of the water flow and the PVC water spraying packing layer is enlarged, the water flow is fully contacted with outside air while flowing through the PVC water spraying packing layer through an oxygen adding motor and an air inlet, an oxidation effect is achieved, the mineral substances in the water flow are oxidized, and subsequent further filtration is facilitated. The water splashed out of the air inlet hole area can be collected by arranging the water retaining groove and flows back into the tank body; the back washing of the filtering device can be realized by arranging a back washing pipe. This filtration purification device is compact reasonable, and is small, takes up an area of fewly, the on-the-spot installation of being convenient for, and operation safe and reliable can effectively filter the deep groundwater of centering, avoids aquatic impurity to damage indirect heating equipment and pipeline, pollutes groundwater when avoiding the backward flow simultaneously, and cooperation deep geothermal water gathers and heating system result of use is better.
3. The invention has high heat utilization rate and good heat supply effect, does not damage the underground geological structure and does not pollute the underground geological structure, and the filtering purification device filters the underground geological structure and then carries out heat exchange and recharging to avoid polluting shallow water and simultaneously plays a role in protecting the heat exchange device and the pipeline.
4. The system of the invention has less land occupation, is convenient for construction, installation and maintenance, the position of the collecting well can be arranged beside a road, in a green belt and the like, only one standard well cover is seen in the appearance, and compared with the existing geothermal collecting mode adopting the heat exchange of the soil of the buried pipe, the system can save a large amount of land occupation area and construction cost.
Drawings
FIG. 1 is a schematic diagram of a deep geothermal energy harvesting same well pumpback system of the present invention;
FIG. 2 is a schematic view of the closure device;
FIG. 3 is a schematic view of the structure of the filtration purification apparatus;
FIG. 4 is a schematic top view of a water retaining tank portion of the filtration purification apparatus;
Fig. 5 is a schematic view showing the development of the air inlet hole portion in the filtration purification apparatus.
Reference numbers in the figures: 1, a heat energy extraction area, 2 a recharge area, 3 a sealing device, 4 a bearing steel plate, 5 a sealing rubber plate, 6 a water pumping pipe, 7 a submersible pump, 8 a water return pipe, 9 a quartz sand filter material layer and 10 a fixing bolt; 11 tank bodies, 12 water inlet pipes, 13 water outlet pipes, 14 frosting filter material layers, 15 quartz sand filter material layers and 16PVC water spraying filler layers; 17 air inlet holes, 18 oxygenation fans; 19 water retaining groove; 20 water outlet pipe heads, 21 backwashing pipes, 22 water discharge pipes, 23 sedimentation tanks, 24 backflow holes, 25 filler baffles and 26 water permeable grooves; 27 bedrock, 28 heat exchangers, 29 filtration and purification devices.
f1 water inlet valve, F2 flushing valve, F3 water outlet valve and F4 water outlet valve.
In fig. 3: arrow A is the water inlet flow direction, arrow B is the back washing water flow direction, and arrow C is the air flow direction driven by the oxygenation fan.
The arrows in fig. 1 indicate the direction of water flow.
Detailed Description
The following examples are given to illustrate specific embodiments of the present invention, but are not intended to limit the scope of the present invention in any way. The apparatus elements referred to in the following examples are, unless otherwise specified, conventional apparatus elements; the industrial raw materials are all conventional industrial raw materials which are sold on the market, if not specifically mentioned.
Example 1: a middle-deep geothermal energy collecting and pumping system in the same well, which is shown in figures 1 and 2, comprises a collecting well and a heat exchange assembly.
The collecting well comprises a well body, the well body comprises a heat energy extraction area 1 at the lower part and a recharge area 2 at the upper part, the diameter of a well hole of the heat energy extraction area 1 is smaller than that of the well hole of the recharge area 2, a sealing device 3 is arranged at the adjacent position between the heat energy extraction area 1 and the recharge area 2, the sealing device 3 comprises a bearing steel plate 4 and a sealing rubber plate 5 fixedly arranged on the lower surface of the bearing steel plate 4, the sealing rubber plate 5 is fastened with the bearing steel plate 4 through a fixing bolt 10, and the sealing device 3 is arranged at the top of the well hole of the heat energy extraction area 1; a through hole for penetrating through the water pumping pipe 6 is formed in the center of the bearing steel plate 4, the lower end of the water pumping pipe 6 extends into the heat energy extraction area 1, and a submersible pump 7 for pumping geothermal water is connected to the lower end of the water pumping pipe 6; a quartz sand filter material layer 9 is filled between the outer side of the well pipe of the reinjection area 1 and the inner wall of the well hole, and the quartz sand filter material layer 9 is formed by filling a quartz sand filter material with the diameter of 2-4 mm.
wherein, the depth of the well body is more than 1000 meters, and the appropriate well depth can be set according to the geological condition, generally between 1000 and 2000 meters; the recharge area 2 is positioned between 100-500 meters in the well body, and the well pipe of the recharge area 2 is a bridge type filter pipe.
In the embodiment, the diameter of the well hole of the recharge area 2 is 600mm, the well pipe of the recharge area 2 is a bridge type water filtering pipe and has the diameter of 300mm, the diameter of the well hole of the area with the depth of 500-1000 meters in the heat energy extraction area 1 is 300mm, the well pipe is a spiral pipe with the diameter of 250mm, and water is not taken from the area; the water taking area is located in an area with the depth of more than 1000 meters, the diameter of a well hole is 250mm, water is taken from cracks of the bedrock 11, and a well pipe does not need to be placed.
The heat exchange component comprises a filtering and purifying device 29 and a heat exchanger 28, a water suction pipe 6 is communicated with a water inlet pipe 12 of the filtering and purifying device 29, a water outlet pipe 13 of the filtering and purifying device 29 is communicated with a water inlet of the heat exchanger 28, the heat exchanger 28 is connected to a heating pipe network, a water outlet of the heat exchanger 28 is connected with a water return pipe 8, a water outlet end of the water return pipe 8 extends into the recharge area 2, and geothermal water after heat exchange flows back to the recharge area 2 through the water return pipe 8.
the filtering and purifying device 29 comprises a tank body 11 with an opening at the top, a water inlet pipe 12 and a water outlet pipe 13, and referring to fig. 3-5, a frosting filter material layer 14, a quartz sand filter material layer 15 and a PVC water-spraying filler layer 16 are sequentially arranged in the tank body 11 from bottom to top; the side wall of the tank body 11 is provided with uniformly distributed air inlet holes 17 in the area corresponding to the PVC water-spraying packing layer 16, and the opening at the top of the tank body 11 is provided with an oxygen adding fan 18 for exhausting air upwards; a water retaining groove 19 is arranged at the position of the side wall of the tank body 11 covering the air inlet hole area. The bottom surface of the water retaining groove 19 is annular and is connected with the outer wall of the tank body 11, and the side surface of the water retaining groove 19 surrounds the circumference of the side wall of the tank body 11 and is higher than the height of the air inlet area; a return hole 24 is arranged on the side wall of the tank body 11 near the bottom of the inner side of the water retaining groove 19.
The water inlet pipe 12 extends into the tank body 11 and is positioned above the PVC water spraying packing layer 16, a plurality of water outlet pipe heads 20 are uniformly distributed on the part of the water inlet pipe 12 positioned in the tank body 11, and a water inlet valve F1 is arranged on the water inlet pipe 12; the bottom of the tank body 11 is provided with a water outlet which is connected with a water outlet pipe 13, and the water outlet pipe 13 is provided with a water outlet valve F4.
The filtering and purifying device 29 further comprises a back washing pipe 21, one end of the back washing pipe 21 is connected with the water inlet pipe 12, the connection position is located in front of the water inlet valve F1, the other end of the back washing pipe 21 is connected with the water outlet at the bottom of the tank body 11, and a washing valve F2 is arranged on the back washing pipe 21 and used for enabling back washing water to enter the tank body 11 from the water outlet at the bottom; a water outlet is arranged on the side wall of the tank body between the PVC water-spraying filler layer 16 and the quartz sand filter material layer 15, the water outlet is connected with a water discharge pipe 22, and a water discharge valve F3 is arranged on the water discharge pipe 22 and used for discharging back washing water; the drain pipe 22 is connected to an external settling tank 23.
The PVC water spraying packing layer 16 consists of a plurality of PVC water spraying sheets which are vertically arranged in parallel, and the PVC water spraying sheets are S-shaped; a filler baffle 25 is arranged at the bottom of the frosting filter material layer 14, and water permeable holes are distributed on the filler baffle 25; the filler baffle 25 is provided with a water permeable tank 26 which protrudes upwards and has a downward opening, and water permeable holes are uniformly distributed on the side wall and the top surface of the water permeable tank 26.
Through tests, the deep geothermal energy collection same-well pumping-back system can provide 3000KW-5000KW energy and can supply heating for buildings with 50000-. For example, the water pumping temperature of one collection well is about 80 ℃, the flow rate is 50 tons/hour, the water return temperature is 30 ℃ after passing through a heat exchanger, and the heat extracted at the temperature of 50 ℃ is 2900KW, so that the method can be used for heating residents with the square meter of 72500 in winter (the house heating load is calculated according to 40W/square meter).
The invention relates to a specific working mode of a deep geothermal energy collection same-well pumping system, which comprises the following steps:
The submersible pump pumps geothermal water in the heat energy extraction area, the geothermal water flows out through the water pumping pipe and enters the heat exchanger for heat exchange, and the heat exchanger is connected to a heating pipe network to realize the utilization of heat energy; and after the geothermal water after heat exchange flows out of the heat exchange device, the geothermal water flows back to a recharge area of the collection well through a water return pipe, so that the recharge of the geothermal water is realized. The bridge type water filtering pipe and the quartz sand filtering material layer are arranged in the recharge area, so that water seepage and filtering are facilitated. The sealing device is arranged at the joint of the heat energy extraction area and the recharge area, so that the recharge water can be prevented from directly flowing into the heat energy extraction area to influence the water quality and the water temperature in the heat energy extraction area.
set up filtration purification device before the heat exchanger, filtration purification device's the filtration process of intaking: the water inlet valve F1 and the water outlet valve F4 are opened, the flushing valve F2 and the drain valve F3 are closed, the oxygenation fan is opened, the middle-deep geothermal water pumped out from the underground flows in through the water inlet pipe and flows out through the water outlet pipe heads, the water flows downwards along gaps among the PVC water spraying pieces in the PVC water spraying filler layer, under the driving of the oxygenation fan, the external air enters the tank body through the air inlet hole and is pumped out from the top of the tank body, and the air and the water flowing to the PVC water spraying filler layer are fully contacted in the process, so that oxygenation oxidation is realized. And the water flow sequentially passes through the quartz sand filter material layer and the frosted filter material layer to be further filtered, and then flows into subsequent heat exchange equipment through the water outlet pipe, so that the utilization of heat energy is realized.
The back washing process of the filtering and purifying device comprises the following steps: closing the water inlet valve F1 and the water outlet valve F4, opening the flushing valve F2 and the water discharge valve F3, closing the oxygenation fan, enabling water flow to enter the tank body from a water outlet at the lower part, overflowing upwards, flushing the frosted filter material layer and the quartz sand filter material layer, discharging impurities in the water flow along a water flow drain pipe, flowing into an external sedimentation tank, and performing subsequent treatment and discharge after sedimentation.
According to the invention, the collection well with water pumping and water returning functions is adopted to collect and utilize the heat in the geothermal water in the middle and deep layers, but no geothermal water is consumed, the recharge rate of the geothermal water after heat exchange is high, the underground water level cannot be reduced, and the change and the damage of the geological structure cannot be caused. The invention has small floor area, convenient construction and maintenance, lower cost and higher resource utilization rate.
While the present invention has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various changes can be made in the specific parameters of the embodiments without departing from the spirit of the present invention, and that various specific embodiments can be made, which are common variations of the present invention and will not be described in detail herein.
Claims (10)
1. the system is characterized by comprising a collecting well and a heat exchange assembly;
The collecting well comprises a well body, the well body comprises a heat energy extraction area at the lower part and a recharge area at the upper part, the diameter of a well hole of the heat energy extraction area is smaller than that of a well hole of the recharge area, a sealing device is arranged at the adjacent position between the heat energy extraction area and the recharge area, the sealing device comprises a bearing steel plate and a sealing rubber plate fixedly arranged on the lower surface of the bearing steel plate, and the sealing device is arranged at the top of the well hole of the heat energy extraction area; a through hole for penetrating through a water pumping pipe is formed in the center of the bearing steel plate, the lower end of the water pumping pipe extends into the heat energy extraction area, and a submersible pump for pumping geothermal water is connected to the lower end of the water pumping pipe; a quartz sand filter material layer is filled between the outer side of a well pipe of the reinjection area and the inner wall of a well hole;
the heat exchange assembly comprises a filtering and purifying device and a heat exchanger, the water pumping pipe is communicated with the water inlet pipe of the filtering and purifying device, the water outlet pipe of the filtering and purifying device is communicated with the water inlet of the heat exchanger, the heat exchanger is connected into a heating pipe network, the water outlet of the heat exchanger is connected with a water return pipe, the water outlet end of the water return pipe extends to the interior of the recharge area, and geothermal water after heat exchange flows back to the recharge area through the water return pipe.
2. The system for collecting geothermal energy in the middle deep layer of claim 1 and pumping back the geothermal energy in the same well, wherein the filtering and purifying device comprises a tank body with an opening at the top, a water inlet pipe and a water outlet pipe, and a frosted filter material layer, a quartz sand filter material layer and a PVC water-spraying packing layer are sequentially arranged in the tank body from bottom to top; uniformly distributed air inlet holes are formed in the side wall of the tank body in the area corresponding to the PVC water-spraying packing layer, and an oxygen adding fan for exhausting air upwards is arranged at the opening at the top of the tank body; a water retaining groove is arranged at the position of the side wall of the tank body, which covers the air inlet hole area;
The water inlet pipe extends to the inside of the tank body and is positioned above the PVC water spraying packing layer, a plurality of water outlet pipe heads are uniformly distributed on the part of the water inlet pipe positioned in the tank body, and a water inlet valve is arranged on the water inlet pipe; the water outlet is formed in the bottom of the tank body and is connected with a water outlet pipe, and a water outlet valve is arranged on the water outlet pipe.
3. The system for collecting geothermal energy from a medium depth layer through the same well as recited in claim 2, wherein the filtration and purification device further comprises a back-flushing pipe, one end of the back-flushing pipe is connected with the water inlet pipe, the connection point is located in front of the water inlet valve, the other end of the back-flushing pipe is connected with the water outlet at the bottom of the tank body, and a flushing valve is arranged on the back-flushing pipe and is used for enabling back-flushing water to enter the tank body from the water outlet at the bottom; a water outlet is formed in the side wall of the tank body between the PVC water-spraying filler layer and the quartz sand filter material layer, the water outlet is connected with a water discharge pipe, and a water discharge valve is arranged on the water discharge pipe and used for discharging back washing water; the drain pipe is communicated to an external sedimentation tank.
4. The system of claim 2, wherein the bottom of the water retaining groove is annular and connected to the outer wall of the tank, and the side of the water retaining groove surrounds the circumference of the side wall of the tank and has a height greater than the height of the air inlet hole; and a backflow hole is formed in the side wall of the tank body and is close to the bottom of the inner side of the water retaining groove.
5. The system of claim 2, wherein the PVC water-spraying packing layer is composed of a plurality of PVC water-spraying sheets arranged in parallel in the vertical direction, and the PVC water-spraying sheets are in S-wave shape.
6. The system for collecting geothermal energy from a middle deep layer of claim 2, wherein a filler baffle is arranged at the bottom of the frosted filter layer, and water permeable holes are distributed on the filler baffle; the filler baffle is provided with a water permeable groove which protrudes upwards and has a downward opening, and water permeable holes are uniformly distributed on the side wall and the top surface of the water permeable groove.
7. The system of claim 1, wherein the sealing rubber plate is fastened to the load-bearing steel plate by fixing bolts.
8. The system for collecting and withdrawing geothermal energy from the same well in the middle-deep layer according to claim 1, wherein the quartz sand filter material layer is filled with a quartz sand filter material with a diameter of 2-4 mm.
9. The mid-depth geothermal energy harvesting same well pumpback system of claim 1, wherein the depth of the body of the harvesting well is greater than 1000 meters; the recharge area is located at a position between 100 and 500 meters.
10. the system of claim 1, wherein the well casing of the recharge area is a bridge strainer.
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| CN110542143B (en) | 2024-07-02 |
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