CN114349226A - High-efficient recharge system of geothermal tail water - Google Patents
High-efficient recharge system of geothermal tail water Download PDFInfo
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- CN114349226A CN114349226A CN202210166366.0A CN202210166366A CN114349226A CN 114349226 A CN114349226 A CN 114349226A CN 202210166366 A CN202210166366 A CN 202210166366A CN 114349226 A CN114349226 A CN 114349226A
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- water
- settling tank
- geothermal
- tail water
- storage settling
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 238000001914 filtration Methods 0.000 claims abstract description 51
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- 238000011010 flushing procedure Methods 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 230000000844 anti-bacterial effect Effects 0.000 claims description 5
- 239000003899 bactericide agent Substances 0.000 claims description 5
- 239000003112 inhibitor Substances 0.000 claims description 5
- 239000002455 scale inhibitor Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 4
- 244000005700 microbiome Species 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005421 electrostatic potential Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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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- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention belongs to the field of geothermal energy development, and particularly relates to a geothermal tail water efficient recharging system which comprises a pumping well, a storage settling tank, a standby storage settling tank, an external water source, a geothermal tail water desanding device, a heat exchange system, a filtering system, a reverse flushing pump, a gas-water separation device, a metal scale preventer, a supercharging device, a flow regulating pump, a wellhead device, an underground water stopper, a recharging well, an electric regulating valve, a pressure control valve, a pressure sensor, a temperature sensor and a water level sensor. The storage settling tank and the standby storage settling tank are connected with an external water source to play a role in auxiliary recharge, and thus the hundred-percent recharge of the geothermal tail water is realized. The heat exchange system is used by connecting a plurality of plate heat exchangers in series, so that the multi-stage utilization of geothermal tail water is realized. The back flushing pump directly utilizes the filtered back flushing water to carry out back flushing, thereby avoiding the use of a water storage tank and reducing the occupied area of the system. The system can realize the efficient recharge of the geothermal tail water and the sustainable development of geothermal resources.
Description
Technical Field
The invention relates to the field of geothermal energy development, in particular to a geothermal tail water efficient recharge system.
Background
Geothermal resources are clean energy which is pollution-free and renewable, and have the advantages of abundant reserves, low carbon, environmental protection and the like compared with the traditional fossil energy. For hydrothermal geothermal resources, the heat energy carried by the pumped underground water is utilized, but the underground water is not inexhaustible. A large amount of water is pumped without recharging, so that the water level is inevitably and continuously reduced, the service life of the geothermal well is reduced, and the continuous development and utilization of the geothermal are not facilitated. Meanwhile, the geothermal water is only pumped and not poured, so that the geothermal resources are not protected, geothermal water containing certain harmful components is discharged to surface water or permeates underground, environment pollution of different degrees is caused, and thermal pollution is caused due to ultrahigh drainage temperature. The effective geothermal tail water recharge can relieve the problems of water level reduction and the like caused by excessive exploitation of underground hot water, and is the most direct and effective means for sustainable exploitation and utilization of geothermal resources.
The existing geothermal recharging system is basically composed of a sand removing device, a filter, an exhaust device and a pressurizing device, impurities in the recharging water can be filtered, gas in the recharging water can be separated, hundreds of percent of geothermal tail water recharging can not be realized, and part of geothermal recharging system reverse cleaning systems are provided with water storage tanks, so that the floor area of the system is increased, and a recharging target layer and a non-target layer can not be separated.
Disclosure of Invention
The invention aims to overcome the defects of the existing recharging system, provides the geothermal tail water efficient recharging system, designs an efficient and complete tail water recharging process, and realizes reasonable and optimized configuration to increase the recharging amount of the recharging well.
The technical scheme of the invention is as follows: the utility model provides a high-efficient recharge system of geothermal tail water, includes a set of geothermal well, stores the setting tank, reserve storage setting tank, outside water source, geothermal tail water sand removal device, heat transfer system, filtration system, reverse flush pump, gas-water separation device, metal scale control ware, supercharging device, flow control pump, wellhead assembly, the stagnant water ware in the pit, the recharge well, electronic regulating valve, pressure control valve, pressure sensor, temperature sensor, level sensor. The heat exchange system, the filtering system and the reverse flushing system are all controlled by an automatic control device.
According to the invention, the storage settling tank has the functions of heat preservation and heat insulation, and a proper amount of corrosion inhibitor, scale inhibitor and bactericide is added into the storage settling tank.
In the invention, the storage settling tank is provided with a standby storage settling tank, and the storage settling tank and the standby storage settling tank are connected with an external water source.
In the invention, the heat exchange system adopts a plurality of plate heat exchangers to be used in series, and the number of the heat exchangers is determined according to the actual temperature of the geothermal tail water; a temperature sensor is arranged at the outlet of each plate heat exchanger; each plate heat exchanger is connected with the filtering system through an electric regulating valve; the two plate heat exchangers are connected through an electric regulating valve.
In the invention, the filtering system consists of two sets of filtering lines, each filtering line consists of a pressure sensor and two filters with two precisions, the first filter is coarse filtering, the second filter is fine filtering, and the two filters with the two precisions are installed in series. Pressure sensors are arranged at the inlet and the outlet of the two precision filters.
In the invention, the back flushing pump is connected with the filtering system through the pressure control valve, and the filtered back irrigation water back flushing blocked filtering system is directly utilized, so that the use of a water storage tank is avoided, and the occupied area of the system is reduced.
According to the invention, the wellhead device has good sealing performance, and is provided with a pressure sensor, a water level sensor, a flow regulating pump and a blowout preventer.
In the invention, the underground water stopper plugs the rest part of the specified recharge layer of the recharge well.
The technical principle of the invention is as follows:
the storage settling box primarily settles the silt in the geothermal tail water according to the heat preservation and heat insulation functions. Proper amounts of corrosion inhibitor, scale inhibitor and bactericide are added into the storage settling tank, microorganisms in water are removed, corrosion of geothermal tail water to metal pipelines and metal devices is prevented, and scale formation is inhibited. When the actual recharge amount of the recharge well is not matched with the theoretical requirement, the storage settling tank connected with an external water source plays a role in assisting recharge, and hundred-percent recharge of the geothermal tail water is realized.
The heat exchange system is used by connecting a plurality of plate heat exchangers in series, so that the multi-stage utilization of the geothermal tail water can be realized, and the number of the heat exchangers is determined according to the actual temperature of the geothermal tail water. The temperature sensor is installed at the outlet of each plate heat exchanger, when the temperature is higher than the preset recharging temperature, the automatic control device opens the electric control valve connected with the next plate heat exchanger, the geothermal tail water enters the next plate heat exchanger for heat exchange, and when the temperature of the geothermal tail water reaches the preset recharging temperature, the automatic control device opens the electric control valve connected with the filtering system, and the geothermal tail water enters the filtering system.
The filtering system consists of two sets of filtering lines, each filtering line consists of a pressure sensor and two filters with different precisions, the primary filter and the secondary filter are installed in series, the pressure sensors are installed at the inlet and the outlet of the two filters, and whether the filters are blocked or not is judged according to the numerical values of the pressure sensors. When the value of the pressure sensor connected with the working filtering line exceeds the set pressure value, the automatic control device opens the pressure control valve connected with the standby filtering line, and simultaneously opens the pressure control valve connected with the back flushing pump, the back flushing pump directly utilizes the back flushing water filtered by the standby filtering line to flush the blocked working filtering line, and the flushing water is filtered by the standby filtering system.
The wellhead device has good sealing performance, so that the recharge well is isolated from air, and the phenomena that microorganism blockage of a reservoir layer and pressure relief of recharge water are caused by air entering to influence the efficient recharge of the geothermal tail water are avoided. The wellhead device is provided with a pressure sensor, a water level sensor and a flow regulating pump, data measured by the pressure sensor and the water level sensor are fed back to the flow regulating pump in real time, and the recharge quantity of the geothermal tail water is controlled by regulating the flow. The wellhead device is provided with a blowout preventer, so that the operations such as well washing and the like can be performed at the later stage conveniently.
The underground water stopper plugs the rest parts except the recharge layer, so that the serial layer flow of the recharge water is effectively prevented, and the recharge rate of the geothermal tail water is increased.
The specific effects are as follows: (1) the storage settling tank is used for carrying out preliminary sedimentation on large-particle silt, and meanwhile, a proper amount of corrosion inhibitor, scale inhibitor and bactericide is added into the storage settling tank, so that microorganisms in water are removed, geothermal tail water is prevented from corroding metal pipelines and metal devices, and scale formation is inhibited; when the actual recharge amount of the recharge well is not matched with the theoretical requirement, the storage settling tank connected with an external water source plays a role in assisting recharge, and hundred-percent recharge of geothermal tail water is realized. (2) A plurality of plate heat exchangers are used in series, and multi-stage utilization of geothermal tail water is achieved. (3) The back flushing pump is connected with the filtering system through the pressure control valve, filtered back flushing water is directly used for back flushing, a water storage tank is avoided, and the occupied area of the system is reduced. (4) The geothermal tail water is separated from the gas dissolved in the water by the gas-water separation device, so that the recharge blockage caused by bubbles mixed in the geothermal tail water is avoided. (5) The underground water stopper is equipped to separate the recharge target layer from the non-target layer, so that the pollution of the recharge water to different aquifers is avoided.
Drawings
FIG. 1 is a schematic diagram of a geothermal tail water efficient recharge system in an embodiment of the invention.
FIG. 2 is a schematic diagram of a heat exchange system in an embodiment of the invention.
FIG. 3 is a schematic view of a filtration system in an embodiment of the invention.
In the figure: 1. the system comprises a water pumping well, 2 an electric regulating valve, 3 a storage settling tank, 4 a spare storage settling tank, 5 an external water source, 6 a geothermal tail water desanding device, 7 a heat exchange system, 8 a plate heat exchanger, 9 a temperature sensor, 10 a pressure control valve, 11 a filtering system, 12 a pressure sensor, 13 a primary filter, 14 a secondary filter, 15 a reverse flushing pump, 16 an air-water separation device, 17 a metal antiscaling device, 18 a supercharging device, 19 a flow regulating pump, 20 a water level sensor, 21 a wellhead device, 22 a downhole device and 23 a recharging well.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The high-efficiency geothermal tail water recharging system shown in fig. 1 comprises a pumping well 1, an electric regulating valve 2, a storage settling tank 3, a standby storage settling tank 4, an external water source 5, a geothermal tail water desanding device 6, a heat exchange system 7, a pressure control valve 10, a filtering system 11, a pressure sensor 12, a reverse flushing pump 15, an air-water separation device 16, a metal scale preventer 17, a supercharging device 18, a flow regulating pump 19, a water level sensor 20, a wellhead device 21, a downhole water stopper 22 and a recharging well 23.
Wherein the pumping well 1 is connected with a storage settling tank 3 and a standby storage settling tank 4 through an electric regulating valve 2, the storage settling tank 3 and the standby storage settling tank 4 are connected with an external water source 5, the geothermal tail water desanding device 6 is connected, the geothermal tail water desanding device 6 is connected with a heat exchange system 7, the heat exchange system 7 is connected with a filtering system 11 through a pressure control valve 10, a reverse flushing pump 15 is connected with the filtering system 11 through the pressure control valve 10, a gas-water separation device 16 is connected with the filtering system 11, a metal antiscaling device 17 is connected with the gas-water separation device 16, a pressurizing device 18 is connected with the metal antiscaling device 17, a flow regulating pump 19 is connected with the pressurizing device 18, a recharge well 23 is connected with the flow regulating pump 19, the recharge well 23 is provided with a wellhead device 21 and a downhole water stop 22, and the wellhead device 21 is connected with a pressure sensor 12 and a water level sensor 20.
During operation, geothermal water is pumped from the pumping well 1 and reaches the storage settling tank 3 through the electric regulating valve 2. The storage settling tank 3 has the functions of heat preservation and heat insulation, preliminarily settles the silt in the geothermal tail water, and simultaneously adds a proper amount of corrosion inhibitor, scale inhibitor and bactericide into the storage settling tank 3 to remove microorganisms in water, prevent the geothermal tail water from corroding metal pipelines and metal devices and inhibit scale formation. After sequentially passing through the geothermal tail water desanding device 6 and the heat exchange system 7, the geothermal tail water after heat exchange is filtered by the filtering system 11. The geothermal tail water enters a gas-water separation device 16 after being filtered, gas dissolved in the water is separated and discharged, and then the electrostatic potential of the fluid is changed through a metal scale preventer 17, so that the anions and the cations in the fluid are not easy to scale. Then the pressure is increased by a pressure increasing device 18 and injected into a recharging well 23 through a flow regulating pump 19, and the whole recharging process is completed.
As shown in fig. 2, the heat exchange system 7 includes: plate heat exchanger 8, temperature sensor 9, electrical control valve 2.
The heat exchange system 7 is used by connecting a plurality of plate heat exchangers 8 in series, a temperature sensor 9 is installed at the outlet of each plate heat exchanger 8, when the temperature is higher than the preset recharging temperature, the automatic control device opens the electric regulating valve 2 connected with the next plate heat exchanger 8, geothermal tail water enters the next plate heat exchanger 8 for heat exchange, until the temperature of the geothermal tail water reaches the preset recharging temperature, the automatic control device opens the electric regulating valve 2 connected with the filtering system 11, and the geothermal tail water enters the filtering system 11.
As shown in fig. 3, the filter system 11 includes: a pressure sensor 12, a primary filter 13 and a secondary filter 14.
The filtering system 11 consists of two sets of filtering lines, and when the equipment needs to be overhauled and replaced, the situation that the ground heat recharging system is closed to influence the recharging operation is avoided. The filter circuit consists of a pressure sensor 12 and two filters with two precisions, a primary filter 13 and a secondary filter 14 are installed in series, the pressure sensor 12 is installed at the inlet and the outlet of the two filters, and whether the filters are blocked or not is judged according to the numerical value of the pressure sensor 12.
And (3) selecting one set of filtering line as a working filtering line, when the numerical value of a pressure sensor 12 connected with the working filtering line exceeds the set pressure value, starting a pressure control valve 10 connected with a standby filtering line by an automatic control device, simultaneously starting the pressure control valve 10 connected with a reverse flushing pump 15, directly flushing the blocked working filtering line by the reverse flushing pump 15 by using the back flushing water filtered by the standby filtering line, and filtering the flushing water by the standby filtering line. When the pressure sensor 12 connected to the previously clogged working filter line recovers its value to a normal pressure value, the automatic control means closes the pressure control valve 10 connected to the unclogged working filter line and simultaneously closes the pressure control valve 10 connected to the back flushing pump 15.
The other parts of the underground water stopper 22 except the recharge layer are blocked, so that the serial layer flow of the recharge water is effectively prevented, and the recharge rate of the geothermal tail water is increased.
The wellhead device 21 is connected with the pressure sensor 12 and the water level sensor 20, and the condition of the recharge well 23 is monitored according to the data of the pressure sensor 12 and the water level sensor 20 so as to control the recharge flow of the geothermal tail water. When the actual recharge volume of the recharge well 23 is not matched with the theoretical requirement, the storage settling tank 3 and the storage settling tank 4 play a role in assisting recharge, the storage settling tank 3 and the storage settling tank 4 are connected with an external water source 5, and the one-hundred-percent recharge of the geothermal tail water is realized.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. Wherein similar substitutes are made for the above description and obvious modifications are intended to be covered by the scope of the invention as defined by the appended claims and equivalents thereof.
Claims (4)
1. The efficient geothermal tail water recharging system is characterized by comprising a pumping well (1), an electric regulating valve (2), a storage settling tank (3), a standby storage settling tank (4), an external water source (5), a geothermal tail water sand removing device (6), a heat exchange system (7), a plate heat exchanger (8), a temperature sensor (9), a pressure control valve (10), a filtering system (11), a pressure sensor (12), a primary filter (13), a secondary filter (14), a reverse flushing pump (15), an air-water separating device (16), a metal antiscaling device (17), a supercharging device (18), a flow regulating pump (19), a water level sensor (20), a wellhead device (21), an underground water stopper (22) and a recharging well (23);
the pumping well (1) is connected with a storage settling tank (3) and a standby storage settling tank (4) through an electric control valve (2), the storage settling tank (3) and the standby storage settling tank (4) are connected with an underground water source (5) and a hot tail water desanding device (6), the geothermal tail water desanding device (6) is connected with a heat exchange system (7), the heat exchange system (7) is connected with a filtering system (11) through a pressure control valve (10), a reverse flushing pump (15) is connected with the filtering system (11) through the pressure control valve (10), a gas-water separating device (16) is connected with the filtering system (11), a metal antiscale device (17) is connected with the gas-water separating device (16), a supercharging device (18) is connected with the metal antiscale device (17), a flow regulating pump (19) is connected with the supercharging device (18), and a recharge well (23) is connected with the flow regulating pump (19), the recharging well (23) is provided with a wellhead device (21) and a downhole water stopper (22), and the wellhead device (21) is connected with the pressure sensor (12) and the water level sensor (20).
2. The heat exchange system (7) of claim 1 is used by connecting a plurality of plate heat exchangers (8) in series, the number of the plate heat exchangers (8) is determined according to the actual temperature of the geothermal tail water, a temperature sensor (9) is arranged at the outlet of each plate heat exchanger (8), the plate heat exchangers (8) are connected through an electric regulating valve (2), and each plate heat exchanger (8) is connected with a filtering system (11) through the electric regulating valve (2).
3. The filtering system (11) according to claim 1 consists of two sets of filtering circuits, the filtering circuits consist of a pressure sensor (12) and two precision filters, the first filter (13) is coarse filtering, the second filter (14) is fine filtering, the two precision filters are installed in series, and the pressure sensor (12) is installed at the inlet and the outlet of the two precision filters.
4. The storage settling tank (3) of claim 1 has the functions of heat preservation and heat insulation, a proper amount of corrosion inhibitor, scale inhibitor and bactericide is added into the storage settling tank (3), and the storage settling tank (3) is provided with a spare storage settling tank (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210166366.0A CN114349226A (en) | 2022-02-23 | 2022-02-23 | High-efficient recharge system of geothermal tail water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210166366.0A CN114349226A (en) | 2022-02-23 | 2022-02-23 | High-efficient recharge system of geothermal tail water |
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| CN114349226A true CN114349226A (en) | 2022-04-15 |
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| CN202210166366.0A Pending CN114349226A (en) | 2022-02-23 | 2022-02-23 | High-efficient recharge system of geothermal tail water |
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Citations (6)
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|---|---|---|---|---|
| FR2716385A1 (en) * | 1994-02-18 | 1995-08-25 | Dumez Lyonnaise Eaux | Backwashing of water filtration modules mounted in parallel |
| JP2010175136A (en) * | 2009-01-29 | 2010-08-12 | Corona Corp | Geothermal heat pump device |
| CN207180097U (en) * | 2017-07-31 | 2018-04-03 | 中信建筑设计研究总院有限公司 | A kind of heat pump heat distribution system of mid-deep strata underground heat cascade utilization |
| CN108731289A (en) * | 2018-05-18 | 2018-11-02 | 丁祥 | A kind of closed equivalent water intaking of earth source heat pump also water system |
| CN209735109U (en) * | 2018-11-28 | 2019-12-06 | 陕西润中清洁能源有限公司 | Poor methanol filtration system |
| CN210688797U (en) * | 2019-10-31 | 2020-06-05 | 中核坤华能源发展有限公司 | Geothermal recharge system |
-
2022
- 2022-02-23 CN CN202210166366.0A patent/CN114349226A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2716385A1 (en) * | 1994-02-18 | 1995-08-25 | Dumez Lyonnaise Eaux | Backwashing of water filtration modules mounted in parallel |
| JP2010175136A (en) * | 2009-01-29 | 2010-08-12 | Corona Corp | Geothermal heat pump device |
| CN207180097U (en) * | 2017-07-31 | 2018-04-03 | 中信建筑设计研究总院有限公司 | A kind of heat pump heat distribution system of mid-deep strata underground heat cascade utilization |
| CN108731289A (en) * | 2018-05-18 | 2018-11-02 | 丁祥 | A kind of closed equivalent water intaking of earth source heat pump also water system |
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Non-Patent Citations (1)
| Title |
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| 潘玉勤: "《水/土壤源热泵地下换热系统施工技术手册》", 黄河水利出版社 * |
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