CN109855221A - A kind of mine water residual heat extraction and application system - Google Patents
A kind of mine water residual heat extraction and application system Download PDFInfo
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- CN109855221A CN109855221A CN201910220404.4A CN201910220404A CN109855221A CN 109855221 A CN109855221 A CN 109855221A CN 201910220404 A CN201910220404 A CN 201910220404A CN 109855221 A CN109855221 A CN 109855221A
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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
- 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
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
A kind of mine water residual heat extraction and application system, belongs to mine technical field of waste heat utilization.It is characterized by comprising heat pump water source units (2), heat pump water source unit (2) is equipped with mine recirculated water upper hose (3) and return pipe (4), heat pump water source unit (2) connects mine water lifting device by mine recirculated water upper hose (3), heat pump water source unit (2) is connected to underworkings (9) by return pipe (4) connection back pool (5), mine water lifting device.The present invention makes full use of the storage of Abandoned Tunnel to act on, realize that the purpose of energy is released in the heating energy storage of tunnel water body summer, winter heat release, energy is rationally stored, transfers, extract, the operation of water source heat pump units can not only be maintained, and the zero-emission of outer circulation water may be implemented, economic benefit, social benefit are considerable.
Description
Technical field
A kind of mine water residual heat extraction and application system, belongs to mine technical field of waste heat utilization.
Background technique
Coal Mine heat supply in winter and cooling in summer, bathing heat supply rely on water source heat pump system to provide substantially.Mine water is made
For the system outer circulation medium, plays a part of energy exchange, transfer, maintain the normal operation of system.After mine is shut down, mine
Well water source will be unable to obtain from underground, and water resource heat pump fail to open operation at that time.
Water source heat pump units running configuration two path water circulation, i.e., interior circulation, outer circulation are interior to recycle the winter for generating unit
Hot water or summer cold water are sent to the cool-heat-exchanger of user, and user flows through fan delivery by control, realize room temperature control;
Interior recirculated water is back to water source heat pump units after user's cool-heat-exchanger, progress heat exchange, and unit heats to it or cool down weight
It newly send to user locations and and so on realizes that the heat supply of full mine is enjoyed the cool.Outer circulation and interior ringing are on the contrary, interior circulation generates
Summer heat or winter cooling capacity taken away or augmented by outer circulation by water source heat pump units.Outer circulation water flow becomes storage exchange
Medium, maintain the normal operation of water source heat pump units.
After mine is shut down, drainage underground facility is all withdrawn, and water source heat pump units will be unable to run because lacking outer circulation water.
Unit outer circulation water consumption is big, takes evolution formula water at high cost;Maintain the closed outer circulation operation of small range, it is difficult to effectively mention
Take thermal energy needed for unit or the heat collected that can not efficiently scatter and disappear.For this purpose, in conjunction with the use of water resource heat pump, to water source after closing well
The exploration of heat pump unit outer circulation water and research are imperative.Want to solve water source heat pump system clean and effective, pollution zero-emission
The outer circulation problem of water consumption put, should continue to the normal operation of water resource heat pump, provide heating for enterprise and enjoy the cool demand, again
It avoids using valuable fresh groundwater resources, pollute waste, meanwhile, also sufficiently to develop the salvage value of mine laneway.
Summary of the invention
The technical problems to be solved by the present invention are: overcoming the deficiencies of the prior art and provide a kind of solution water resource heat pump system
System outer circulation problem of water consumption meets the demand of enjoying the cool that heats, sufficiently develops mine laneway salvage value, and avoid wasting fresh water source
Mine water residual heat extraction and application system.
The technical solution adopted by the present invention to solve the technical problems is: a kind of mine water residual heat extraction and application system,
Be characterized in that: including heat pump water source unit, heat pump water source unit is equipped with mine recirculated water upper hose and return pipe, heat pump water source
Unit connects mine water lifting device by mine recirculated water upper hose, and heat pump water source unit connects back pool by return pipe,
Mine water lifting device is connected to underworkings.
The external circulating system of water resource heat pump is transformed in the present invention, and the mine water in underworkings is brought into external circulating system
Come.The Abandoned Tunnel space of mine is natural memory space.After mine is shut down, lane space will be filled by mine water, should
Water body becomes the storage medium of natural energy, is connected it with water source heat pump system by technological means, realizes summer ring
The extraction of storage and winter heat after the temperature collection of border is supplied.A link of this water body as water resource heat pump external circulating system
Exploitation is carried out, the voluntarily circulation pattern of this water body is constructed, the heat that summer water source heat pump units absorb constantly is stored
In the mine water body in tunnel, the temperature of the water body is raised, meanwhile, the low temperature displacement of the water body is walked, ground is sent to and respectively uses
Family place realizes that full mine summer enjoys the cool;Winter, the heat for laying in summer also with the water body, subterranean strata thermal energy are slow
User is extracted, meanwhile, take the low temperature at user to the water body, which decline situation then occurs, realizes that winter is used
Family heat supply.Make new external circulating system.
The present invention makes full use of the storage of Abandoned Tunnel to act on, and realizes that the heating energy storage of tunnel water body summer, winter heat release are released
The purpose of energy, rationally stores energy, transfers, extracts, can not only maintain the operation of water source heat pump units, but also can be real
The zero-emission of existing outer circulation water, economic benefit, social benefit are considerable.The mine water lifting device is more equipped with being arranged in parallel
Group.
The mine water lifting device includes upper water branch pipe, non-return valve and source well, and upper water branch pipe is equipped with non-return valve,
Upper water branch pipe one end is connected to source well, and source well is connected to underworkings.
The source well includes the through-hole being provided between ground and underworkings and the connection set being mounted in through-hole
Pipe is connected to underworkings and upper water branch pipe by connection casing, and is connected in casing to be equipped with and connects upper water branch pipe lower water inlet
Immersible pump.
Overflow mechanism is equipped between the back pool and underworkings, back pool passes through lane under overflow mechanism connected well
Road.
The overflow mechanism includes overflow pipe and overflow well, is connected to overflow well and back pool by overflow pipe, described to overflow
Flowing well is the through-hole being provided between ground and underworkings.
It is equipped with connection casing in the overflow well, underworkings and overflow pipe are connected to by connection casing.
Evaporator, compressor and condenser are equipped in the heat pump water source unit.
Compared with prior art, the present invention has the beneficial effects that
The external circulating system of water resource heat pump is transformed in the present invention, brings the mine water in underworkings into external circulating system.
The Abandoned Tunnel space of mine is natural memory space.After mine is shut down, lane space will be filled by mine water, the water body
As the storage medium of natural energy, it is connected by technological means with water source heat pump system, realizes summer environment temperature
The extraction stored with winter heat after degree is collected is supplied.This water body is carried out as a link of water resource heat pump external circulating system
Exploitation, constructs the voluntarily circulation pattern of this water body, and the heat that summer water source heat pump units absorb constantly is stored in lane
In the mine water body in road, the temperature of the water body is raised, meanwhile, the low temperature displacement of the water body is walked, with being sent to each user in ground
Point realizes that full mine summer enjoys the cool;Winter slowly extracts heat that summer lays in, subterranean strata thermal energy also with the water body
To user, meanwhile, take the low temperature at user to the water body, which decline situation then occurs, realizes that winter user supplies
Heat.Make new external circulating system.
The present invention makes full use of the storage of Abandoned Tunnel to act on, and realizes that the heating energy storage of tunnel water body summer, winter heat release are released
The purpose of energy, rationally stores energy, transfers, extracts, can not only maintain the operation of water source heat pump units, but also can be real
The zero-emission of existing outer circulation water, economic benefit, social benefit are considerable.
Continue moreover, the present invention by the system reform, realizes mine water after mine is closed as outer circulation water water source.
Reasonable utilization has been carried out to Abandoned Tunnel.Lane space is utilized and carries out heat storage, and provides object for the transfer of energy release
Matter support, realizes geothermal utilization.The richness in skilful use tunnel deposits form, realizes the isolation applications of surface water and mine water.Technology upgrading
After transformation, the zero-emission of circulatory system waste water is realized.The water circulation system for making mine water above and below ground realizes the shifting of energy
Turn, realizes that enclosed water cycling, water source zero consume, without waste, environmental nonpollution.
Detailed description of the invention
Fig. 1 is mine water residual heat extraction and application system structure diagram.
Wherein, 1, user 101, outlet pipe 102, water inlet pipe 2, heat pump water source unit 201, evaporator 202, compression
Machine 203, condenser 3, mine recirculated water upper hose 301, upper water branch pipe 302, non-return valve 4, return pipe 5, back pool 6,
Source well 7, immersible pump 8, overflow well 9, underworkings 10, upper water throttle valve 11, backwater throttle 12, overflow well.
Specific embodiment
Fig. 1 is highly preferred embodiment of the present invention, and 1 the present invention will be further described with reference to the accompanying drawing.
Referring to attached drawing 1: a kind of mine water residual heat extraction and application system, including heat pump water source unit 2, heat pump water source unit 2
It is equipped with mine recirculated water upper hose 3 and return pipe 4, heat pump water source unit 2 connects mine water by mine recirculated water upper hose 3
Lifting device, heat pump water source unit 2 connect back pool 5 by return pipe 4, and mine water lifting device is connected to underworkings 9.
Mine water lifting device is equipped with the multiple groups being arranged in parallel.Mine water lifting device includes upper water branch pipe 301, non-return valve
302 and source well 6, upper water branch pipe 301 is equipped with non-return valve 302, and upper 301 one end of water branch pipe is connected to source well 6, and source well 6 connects
Logical underworkings 9.Source well 6 includes the connection set for being provided with the through-hole between ground and underworkings 9 and being mounted in through-hole
Pipe is connected to underworkings 9 and upper water branch pipe 301 by connection casing, and is connected in casing to be equipped with and connects upper 301 lower part of water branch pipe
The immersible pump 7 of water inlet.
Overflow mechanism is equipped between back pool 5 and underworkings 9, back pool 5 is connected to underworkings 9 by overflow mechanism.
Overflow mechanism includes overflow pipe 12 and overflow well 8, is connected to overflow well 8 and back pool 5 by overflow pipe 12, the overflow well 8 is
The through-hole being provided between ground and underworkings 9.It is equipped with connection casing in overflow well 8, passes through lane under connection casing connected well
Road 9 and overflow pipe 12.Evaporator 201, compressor 202 and condenser 203 are equipped in heat pump water source unit 2.
The external circulating system of water resource heat pump is transformed in the present invention, and the mine water in underworkings is brought into external circulating system
Come.The Abandoned Tunnel space of mine is natural memory space.After mine is shut down, lane space will be filled by mine water, should
Water body becomes the storage medium of natural energy, is connected it with water source heat pump system by technological means, realizes summer ring
The extraction of storage and winter heat after the temperature collection of border is supplied.A link of this water body as water resource heat pump external circulating system
Exploitation is carried out, the voluntarily circulation pattern of this water body is constructed, the heat that summer water source heat pump units absorb constantly is stored
In the mine water body in tunnel, the temperature of the water body is raised, meanwhile, the low temperature displacement of the water body is walked, ground is sent to and respectively uses
Family place realizes that full mine summer enjoys the cool;Winter, the heat for laying in summer also with the water body, subterranean strata thermal energy are slow
User is extracted, meanwhile, take the low temperature at user to the water body, which decline situation then occurs, realizes that winter is used
Family heat supply.Make new external circulating system.
The present invention makes full use of the storage of Abandoned Tunnel to act on, and realizes that the heating energy storage of tunnel water body summer, winter heat release are released
The purpose of energy, rationally stores energy, transfers, extracts, can not only maintain the operation of water source heat pump units, but also can be real
The zero-emission of existing outer circulation water, economic benefit, social benefit are considerable.
1. water resource heat pump outer circulation water consumption, water temperature are analyzed
When cooling in summer water resource heat pump outer circulation water consumption be less than winter heating's water consumption, with winter heating with water be according to point
Analysis, is divided into three-level water according to weather temperature change:
First order water consumption 300---350m3/h, 5 DEG C or more under weather zero temperature;
Unit classification | Unit runs quantity | Single unit water consumption m3/h | Total water consumption m3/h |
Bathing unit | 1 | 117 | 117 |
Dormitory unit | 1 | 1 | 100 |
The heating of garlic factory | 1 | 10.6 | 10.6 |
Total water consumption | 227.6 |
Second level water consumption 400---450m3/h, 5 DEG C or less under weather zero temperature;
Unit classification | Unit runs quantity | Single unit water consumption m3/h | Total water consumption m3/h |
Bathing unit | 1 | 117 | 117 |
Dormitory unit | 2 | 100 | 200 |
Workshop heating | 1 | 102 | 102 |
The heating of garlic factory | 2 | 10.6 | 21.2 |
Total water consumption | 440.2 |
Third level water consumption 500---550m3/h, 10 DEG C or less under weather zero temperature;
Unit classification | Unit runs quantity | Single unit water consumption m3/h | Total water consumption m3/h |
Bathing unit | 1 | 117 | 117 |
Dormitory unit | 2 | 100 | 200 |
Workshop heating | 2 | 102 | 204 |
The heating of garlic factory | 2 | 10.6 | 21.2 |
Total water consumption | 542.2 |
During coal mining, underground pump house discharges mine water to the ground and is up to 1200m3/h, and daily stabilization is in 500-700m
³/h.After mine is shut down, after a period of time, for mine water stable level in Near Ground, water meets water resource heat pump outer circulation
With the requirement of water.
Through counting, the long-term average temperature of underworkings mine water:
Water source title | Water temperature DEG C |
130 exploiting fields | 24 |
330 exploiting fields | 24.5 |
- 400 exploiting fields | 24 |
1302 drillings | 24 |
The drilling of sump mouth | 26 |
Mine water temperature is stable at 24 DEG C, and rich in energy in huge water body, being that water resource heat pump is excellent takes heat source.Meanwhile tunnel is comprehensive empty
Between it is big, also for water resource heat pump summer accumulation of energy provide it is good can warehouse library.
2. water resource heat pump external water circulation system specific embodiment
The water intaking drilling under the drifting of ground is set as needed, and closed installation diameter is not less than the water intaking access of 500mm;Take 3
A drilling is source well, installs 3, immersible pump, wherein 13 immersible pumps are that main pipe parallel way is arranged to be spare, every 1
Road water withdrawal is greater than 200m3/h;The corresponding branch pipe of every immersible pump installs outlet portal and non-return valve.Number is opened by immersible pump
Flow needed for amount and each branch outlet door aperture adjust.
Construct 400m3Return water pond, the overflow passage in the pond connects the drilling of each return water, i.e. back water well.Return water is by overflowing
Head piece flow to back water well certainly.Ground segment mine water comes together in return water pond through water source heat pump units by source well, by overflow side
Formula is back in back water well, is formed unit and is operated normally the water flow needed, the transfer storage of the energy of realization.Tunnel section mine
Water realizes the circulation migration of energy by back water well through underworkings space backspace source well.The return water pond normal phase possesses water
Amount can and be the fire cistern facility on ground.Return water bottom of pond portion reserves drain outlet, facilitates and is followed by interim pipeline back flush day
Each drilling.Internal bottom of pond is equipped with maintenance puddle, and internal overhaul cleaning in pond is facilitated to use.
To guarantee that summer energy is filled to part stores to tunnel and winter the heat efficiently extracted in the mine water of tunnel, according to
Tunnel sectional area, collects the factors such as amount of heat at water body thermal energy release efficiency, estimates return water drilling and fetches water the spacing of wells not
Distance less than 1Km.
3. power supply system configures.During Transformation Development, with machine station-service electricity transformation Synchronization Design synchronous planning, change to reduce
This is caused, the power supply unit facility withdrawn as far as possible using underground.
4. the long-range control and monitoring of system.Using automatic technology, the long-range control of water pump, source well, return water are realized
Well, return water install monitoring probe at pond, are monitored in water resource heat pump room and far control, meanwhile, video signal transmission mine is protected
Defend section's monitoring center, it is ensured that the safety of installations and facilities.
After technological transformation, the zero-emission that becomes of water resource heat pump outer circulation water is realized.Avoid the pollution at water source.Meanwhile it is real
The ingenious storage to natural heat is showed and has utilized, economic benefit is intuitively visible.
Direct economic benefit:
1, Meteorological: 10+10+8+3+2+3=360,000 yuan
2, Nian Jieyue expense:
Energy consumption pays 462.735 ten thousand yuan.
3, wound effect: the expense that can save is 462.735-36=426.735 ten thousand yuan.
100,000 yuan of investment of system pipeline transformation, 100,000 yuan of dynamical system water pump modification, 80,000 yuan of water pump automatic-control system, monitoring
30,000 yuan of system, back pool is transformed 20,000 yuan, and other 30,000 yuan.Estimated 360,000 yuan of the investment of whole system transformation.
According to the operating experience of previous water resource heat pump, water resource heat pump whole year outer circulation average consumption is analyzed: winter with
Summer water resource heat pump load is maximum, the heat supply on the ground such as mining area dormitory, dining room, factory site, bathing, auxiliary shaft cylinder, organ building, meeting room
Enjoy the cool and is provided entirely by it.July, August, December, January are season cold and hot the two poles of the earth respectively, and the full efficiency operation of unit, water consumption is most
Greatly, outer circulation use 3 grades of water consumptions, 542.2 tons per hour.Therefore, 4 months total water consumptions be 542.2 × 24 × 31 × 4=
1613587.2 that is, 161.36 ten thousand tons.In June, September, in November, 2 months, temperature was relatively mild, it is possible to reduce load, water consumption are corresponding
Reduce, using 2 grades of water consumptions, 440.2 tons per hour, therefore, this 4 months water consumption be 440.2 × 24 × 30 × 3+28=
1246646.4 that is, 124.66 ten thousand tons.Remaining 4 month temperatures are mild, each load scaled-back, and outer circulation water consumption uses 1
Grade water consumption, 227.6 tons per hour, this 4 months accumulative water consumption are as follows: 227.6 × 24 × 31 × 3+30=671875.2, i.e.,
67.19 ten thousand tons.In conclusion annual water resource heat pump average consumption is 161.36+124.66+67.19=353.21 ten thousand tons.
Water temperature stability in tunnel uses water experience according to many years, and the unit outer circulation water entrance average of the whole year temperature difference is about 8 DEG C.
It is calculated according to formula Q=Cm △ t of liquid caloric receptivity, wherein the specific heat capacity of water is 4.2 × 1000J/kg DEG C, and m is quality, △ t
For temperature variation, the thermal energy that whole year can extract more is Q=4.2 × 1000 × 355.91 × 107×8≈11.96×1010kJ;It is former
The heat that coal per kilogram is absorbed when indicating that one gram of water increases one degree Celsius containing hot about 5000 kilocalories 1 card, approximately equal to 4.2 is burnt
Ear, about 21000kJ.Therefore, it is calculated according to the highest thermal efficiency 0.8 of coal combustion equipment, can save raw coal every year is about 7119 tons.
After technological transformation, external water circulation can be summer heat deposit between underground passage, and the external water temperature difference extracted at that time will be significantly higher than that 8
℃.1 ton of raw coal is calculated according to 650 yuan of market price, and whole year can save about 7119 × 650=462.735 ten thousand yuan of energy consumption expenditure.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.
Claims (7)
1. a kind of mine water residual heat extraction and application system, it is characterised in that: including water source heat pump units (2), water source heat pump units
(2) it is equipped with mine recirculated water upper hose (3) and return pipe (4), water source heat pump units (2) pass through mine recirculated water upper hose
(3) mine water lifting device is connected, water source heat pump units (2) promote dress by return pipe (4) connection back pool (5), mine water
Set connection underworkings (9).
2. a kind of mine water residual heat extraction and application system according to claim 1, it is characterised in that: the mine water mentions
It rises device and is equipped with the multiple groups being arranged in parallel.
3. a kind of mine water residual heat extraction and application system according to claim 1 or 2, it is characterised in that: the mine
Water lifting device includes upper water branch pipe (301), non-return valve (302) and source well (6), and upper water branch pipe (301) is equipped with non-return valve
(302), upper water branch pipe (301) one end connection source well (6), source well (6) are connected to underworkings (9).
4. a kind of mine water residual heat extraction and application system according to claim 3, it is characterised in that: the source well
It (6) include the connection casing for being provided with the through-hole between ground and underworkings (9) and being mounted in through-hole, by being connected to casing
It is connected to underworkings (9) and upper water branch pipe (301), and is connected to be equipped in casing and connects upper water branch pipe (301) lower water inlet
Immersible pump (7).
5. a kind of mine water residual heat extraction and application system according to claim 1, it is characterised in that: the back pool
(5) overflow mechanism is equipped between underworkings (9), back pool (5) is connected to underworkings (9) by overflow mechanism.
6. a kind of mine water residual heat extraction and application system according to claim 5, it is characterised in that: the overflow mechanism
Including overflow pipe (12) and overflow well (8), pass through overflow pipe (12) connection overflow well (8) and back pool (5), the overflow well
It (8) is the through-hole being provided between ground and underworkings (9).
7. a kind of mine water residual heat extraction and application system according to claim 6, it is characterised in that: the overflow well
(8) it is equipped with connection casing in, passes through connection casing connection underworkings (9) and overflow pipe (12).
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US20230003123A1 (en) * | 2021-07-02 | 2023-01-05 | Shandong University Of Science And Technology | Comprehensive utilization method and test equipment for surface water, goaf and geothermal energy in coal mining subsidence area |
US11828177B2 (en) * | 2021-07-02 | 2023-11-28 | Shandong University Of Science And Technology | Comprehensive utilization method and test equipment for surface water, goaf and geothermal energy in coal mining subsidence area |
CN114165944A (en) * | 2021-12-13 | 2022-03-11 | 山东省煤田地质局第四勘探队 | Clean cold and heat source system based on abandoned mine |
CN114165944B (en) * | 2021-12-13 | 2023-08-11 | 山东省煤田地质局第四勘探队 | Clean cold and heat source system based on abandoned mine |
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