CN115111810B - Method for cooperatively utilizing ground source heat pump and subsidence water accumulation source heat pump in coal mining subsidence area - Google Patents
Method for cooperatively utilizing ground source heat pump and subsidence water accumulation source heat pump in coal mining subsidence area Download PDFInfo
- Publication number
- CN115111810B CN115111810B CN202210711508.7A CN202210711508A CN115111810B CN 115111810 B CN115111810 B CN 115111810B CN 202210711508 A CN202210711508 A CN 202210711508A CN 115111810 B CN115111810 B CN 115111810B
- Authority
- CN
- China
- Prior art keywords
- heat pump
- source heat
- water
- subsidence
- area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 207
- 238000005065 mining Methods 0.000 title claims abstract description 161
- 239000003245 coal Substances 0.000 title claims abstract description 146
- 238000009825 accumulation Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005553 drilling Methods 0.000 claims abstract description 84
- 239000002699 waste material Substances 0.000 claims abstract description 24
- 238000011156 evaluation Methods 0.000 claims abstract description 14
- 238000013480 data collection Methods 0.000 claims abstract description 8
- 238000005265 energy consumption Methods 0.000 claims abstract description 6
- 238000009826 distribution Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 20
- 238000005057 refrigeration Methods 0.000 claims description 15
- 238000010276 construction Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 9
- 239000003673 groundwater Substances 0.000 claims description 8
- 238000011161 development Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 238000012876 topography Methods 0.000 claims description 7
- 230000036760 body temperature Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 30
- 238000004364 calculation method Methods 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
Abstract
The invention discloses a method for cooperatively utilizing a ground source heat pump and a subsidence ponding source heat pump in a coal mining subsidence area, which comprises the following steps: performing foundation stability evaluation on a coal mining subsidence area where a subsidence water source heat pump and ground source heat pump project is to be established; geothermal and engineering data collection is carried out on a coal mining subsidence water accumulation area for refrigerating requirements, which is to be established for subsidence water source heat pump engineering, and the available energy is calculated; geothermal and engineering data collection is carried out on abandoned drilling holes or newly-built drilling holes on the periphery of a coal mining subsidence area for heat supply requirements of a ground source heat pump engineering to be established, and available energy is calculated; constructing a sinking water-accumulating source heat pump and ground source heat pump circulating unit and a pipeline thereof related to the engineering of the sinking water-accumulating source heat pump and the ground source heat pump; adjusting the starting modes of the sinking water-accumulating heat pump and the ground source heat pump circulating unit according to the instantaneous actual energy consumption power; the invention has the advantages that: and the waste of land resources, water resources and medium and low heat resources in the coal mining subsidence area is avoided.
Description
Technical Field
The invention relates to a coal mining subsidence area resource utilization technology, in particular to a method for cooperatively utilizing a ground source heat pump and a subsidence ponding source heat pump of a coal mining subsidence area.
Background
For a long time, coal is always the main energy source of China, and development and utilization of coal resources play a great promotion role in the economic high-speed development of China, and make irreplaceable contribution to modern construction of China. However, a large number of empty subsidence areas are formed due to large-scale unreasonable exploitation for many years, so that the ecological environment is greatly destroyed, and particularly in the two-Huai high-water-level mining areas of Anhui province, the whole Anhui province shares a coal mining subsidence area with total area reaching 108.4 mu by the end of 2020, and almost all the subsidence areas are ponding areas, and the ponding all the year round forms a large-scale subsidence ponding lake area.
Various distributed green low-carbon resource utilization modes can be foreseen, and the resource development and utilization modes of the coal mining subsidence water accumulation area are fewer, especially in the stable and subsidence area of the coal mining subsidence, after land reclamation is flattened, the country advocates the reuse of the area for building civil buildings, industrial production plants or agricultural lands, for example: (1) chinese patent publication No. CN106171116a discloses a method for reconstructing ecological agriculture in a coal mining subsidence water-logging area, which comprises developing ecological agriculture reconstruction based on ecological management of the coal mining subsidence area; (2) chinese patent publication No. CN112960865a discloses a method for ecologically treating water environment in a coal mining subsidence area; (3) chinese patent publication No. CN113077088A discloses a method for utilizing the territorial space in the coal mining subsidence ponding region of the urban village; (4) chinese patent publication No. CN113079925a discloses a method for ecologically repairing an aquaculture area, a cultivation area, etc.; (5) chinese patent publication No. CN114097466a discloses a method for restoring ecological environment of coal mining subsidence area water.
The above methods for utilizing the resources of the coal mining subsidence water accumulation area do not relate to or only partially relate to the land resources of the coal mining subsidence stable subsidence area, and do not fully consider the land resources of the coal mining subsidence stable subsidence area and the low-temperature geothermal resources in the coal mining subsidence water accumulation area, so that the waste drilling geothermal resources at the periphery of the coal mining subsidence area cause serious waste of the land resources, water resources and medium-low-temperature thermal resources of the coal mining subsidence area.
Disclosure of Invention
The invention aims to solve the technical problems that the resource utilization method of the coal mining subsidence water accumulation area in the prior art is incomplete in consideration, so that the land resource, the water resource and the medium-low heat resource of the coal mining subsidence area are seriously wasted.
The invention solves the technical problems by the following technical means: a method for the collaborative utilization of a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area, the method comprising:
step one: performing foundation stability evaluation on a coal mining subsidence area where a subsidence water source heat pump and ground source heat pump project is to be established;
step two: the coal mining subsidence water accumulation area for refrigerating requirement of the subsidence water accumulation source heat pump engineering to be established is passed through the formula Q T ＝AC W ρ W ((T H -T S )t H V WH +(T M -T S )t M V WM + (T L -T S )t L V WL ) Geothermal and engineering data collection is performed and available energy is calculated, wherein A represents energy conversion efficiency and C W Represents the specific heat capacity, ρ, of water body in the coal mining subsidence water accumulation area W Represents the water density of a coal mining subsidence ponding area T H The water body temperature T representing the high-temperature working condition in summer S Represents the optimal refrigeration temperature of the working condition in summer, t H V represents the working condition time of high temperature in summer WH Representing the volume of water body in a water subsidence area under high-temperature working condition, T M The water temperature t represents the temperature working condition in summer M V represents the working condition time of the temperature in summer WM Representing the volume of water body in a sinking ponding area under medium temperature working conditions, T L The water body temperature under the working condition of low temperature in summer is represented by t L V represents the working condition time of low temperature in summer WL Representing the volume of water in a sinking ponding region under a low-temperature working condition;
step three: geothermal and engineering data collection is carried out on abandoned drilling holes or newly-built drilling holes on the periphery of a coal mining subsidence area for heat supply requirements of a ground source heat pump engineering to be established, and available energy is calculated;
step four: constructing a sinking water-accumulating source heat pump and ground source heat pump circulating unit and a pipeline thereof related to the engineering of the sinking water-accumulating source heat pump and the ground source heat pump;
step five: when the energy usage unit demand energy is lower than the available energy, the starting mode of the sinking water source heat pump and the ground source heat pump circulating unit is adjusted according to the instantaneous actual energy consumption power, and when the energy usage unit demand energy is higher than the available energy, the sinking water source heat pump and the ground source heat pump circulating unit are not used for heating/refrigerating.
According to the invention, the land resources of the stable subsidence area of coal mining and the geothermal resources in the water-logging area of coal mining subsidence are fully considered, the geothermal resources of waste boreholes at the periphery of the water-logging subsidence area are reasonably evaluated, the usable energy is supplied to an energy using unit by the subsidence water source heat pump and the ground source heat pump circulating unit, the opening mode of the subsidence water source heat pump and the ground source heat pump circulating unit can be regulated according to the instantaneous actual energy consumption power, and the problem that the energy using unit cannot be met due to the fact that the resource waste or insufficient heat supply is caused by the fact that the valve opening mode is not opposite is avoided, so that the waste of the land resources, the water resources and the medium-low heat resources of the coal mining subsidence area is avoided.
Further, the first step includes:
step 101: collecting foundation stability evaluation data, wherein the collected foundation stability evaluation data comprise mining area coal seam mining historical records, mining area coal seam layer thickness distribution maps, mining area mining working face distribution maps, mining area geological mining data and mining subsidence area subsidence range;
step 102: the foundation stability evaluation method is that when the subsidence value of the ground surface point is not more than 30mm for 6 months continuously, the ground surface movement period is considered to be ended, the ground surface reaches stable subsidence, and the foundation is stabilized; wherein the subsidence value of the surface point is monitored by using a total station, a level gauge or an RTK mapping instrument.
Further, the foundation stability evaluation method further comprises: and if apparent resistivity values obtained by using a transient electromagnetic method are distributed in a plane without difference, determining that the underground goaf is stable and the foundation is stable.
Further, the second step includes:
the collected geothermal and engineering data comprise water depth distribution of a coal mining subsidence ponding area, underwater topography distribution, rainfall, and temperature and water quality of each layer of water body of the ponding area; the water depth distribution, the underwater topography distribution and the rainfall of the coal mining subsidence water accumulation area are used for determining how the buried pipes of the subsidence water accumulation source heat pump are distributed, the rainfall of the coal mining subsidence water accumulation area is used for determining the water surface form change of the coal mining subsidence water accumulation area, the temperature of each layer of the coal mining subsidence water accumulation area is used for determining the available temperature range of the coal mining subsidence water accumulation area, the water quality of the coal mining subsidence water accumulation area is used for determining the pipe materials of the ground source heat pump pipes, and whether the water quality has the property of endangering the pipes is judged.
Still further, the third step includes:
collecting the data of abandoned drilling holes at the periphery of the coal mining subsidence area, wherein the data comprise the drilling hole preservation form of the abandoned drilling holes, the drilling time of the abandoned drilling holes in the construction, construction and development stages, the construction purpose, the drilling depth, the drilling horizon, the lithology of each layer, the water yield, the groundwater level and the drilling hole temperature;
collecting newly built drilling data near a coal mining subsidence area, wherein the newly built drilling data comprise the position, drilling depth, drilling horizon, lithology of each layer, water yield, groundwater level and drilling temperature;
by the formula q=a·k z Calculating available energy of abandoned or newly built holes at the periphery of the coal mining subsidence area, wherein k is z The comprehensive heat transfer coefficient is represented by DeltaT, the difference between the average temperature of circulating liquid of the double-U-shaped buried pipe and the original temperature of the rock-soil body is represented by L, the length of a heat exchange hole of the double-U-shaped buried pipe is represented by L, and the time of day is represented by T.
Further, the fourth step includes:
arranging a subsidence water source heat pump heat exchange station or a ground source heat pump heat exchange station in a coal mining subsidence water accumulation area position, a waste drilling hole position or a newly-built drilling hole position and an energy use position distribution area; a circulating pipeline used for being connected to an energy using unit is arranged in the sinking water accumulation source heat pump heat exchange station or the ground source heat pump heat exchange station, and heat preservation and insulation cotton is arranged on the circulating pipeline;
the method is characterized in that a plurality of double-U-shaped buried pipes are arranged in a coal mining subsidence ponding area and are respectively communicated with circulating pipelines in a subsidence ponding water source heat pump heat exchange station or a ground source heat pump heat exchange station, one end of each double-U-shaped buried pipe, which is in contact with the subsidence ponding water source heat pump heat exchange station or the ground source heat pump heat exchange station, is provided with a valve which is controlled to start and stop based on a PLC, when the energy required by a superior energy using unit is more, the PLC controls the opening of the valves of ports of different double-U-shaped buried pipes, and controls the flow rate of the valves to meet different user demands.
Furthermore, a temperature testing device for monitoring the temperatures of different layers in the coal mining subsidence water accumulation area is arranged in the middle of the coal mining subsidence water accumulation area, and the temperature testing device transmits the temperatures of the different layers to a central control center of the subsidence water source heat pump heat exchange station or the ground source heat pump heat exchange station in real time.
Still further, the fifth step includes:
the flow rate of liquid in a circulating pipe of the sinking water-logging heat pump heat exchange station is 2m/s at the highest speed under the condition of fully opening a valve, X scales are shared on the valve, and when Y scales are opened in a rotating mode, the flow rate is 2*X/Y m/s, wherein Y is less than or equal to X; when the layer temperature of the circulating pipe of the heat pump heat exchange station for laying the subsidence water source is t1, the flow rate of water in the pipe is 2m/S, the power is S, and the actual power of the energy use unit is S Real world ThenWherein, N is the number of valves with the valve opening degree of full opening, and N is the pipeline power which does not reach the opening of all the valves;
by the formulaThe valve opening degree of the pipeline which does not reach the opening of all valves is calculated.
Still further, the fifth step further includes:
the liquid flow rate in the circulating pipe of the ground source heat pump heat exchange station is 2m/s at maximum under the condition of full opening of the valve, and the valves are sharedX scales are arranged, when Y scales are opened by rotation, the flow rate is 2*X/Y m/s, wherein Y is less than or equal to X; when the temperature of the deepest layer of the circulating pipe of the heat exchange station of the ground source heat pump is t2, the flow rate of water in the pipe is 2m/S, the power is S', and the actual power of the energy use unit is S Real world ThenA valve is opened to the Y scale.
The invention has the advantages that: according to the invention, the land resources of the stable subsidence area of coal mining and the geothermal resources in the water-logging area of coal mining subsidence are fully considered, the geothermal resources of waste boreholes at the periphery of the water-logging subsidence area are reasonably evaluated, the usable energy is supplied to an energy using unit by the subsidence water source heat pump and the ground source heat pump circulating unit, the opening mode of the subsidence water source heat pump and the ground source heat pump circulating unit can be regulated according to the instantaneous actual energy consumption power, and the problem that the energy using unit cannot be met due to the fact that the resource waste or insufficient heat supply is caused by the fact that the valve opening mode is not opposite is avoided, so that the waste of the land resources, the water resources and the medium-low heat resources of the coal mining subsidence area is avoided.
Drawings
FIG. 1 is a flow chart of a method for the collaborative utilization of a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area according to an embodiment of the present invention;
fig. 2 is a plan view of a geothermal heat pump in a coal mining subsidence area, a geothermal heat pump using abandoned or newly built holes around the coal mining subsidence area, and a heat pump circulation station in a method for cooperatively utilizing the geothermal heat pump in the coal mining subsidence area and the water logging heat pump according to an embodiment of the present invention;
fig. 3 is a side view of a geothermal heat pump and a heat pump circulation station for a coal mining subsidence area in a method for cooperatively utilizing a geothermal heat pump and a water logging heat pump in the coal mining subsidence area according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a method for cooperatively utilizing a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area comprises the following steps:
s1: performing foundation stability evaluation on a coal mining subsidence area where a subsidence water source heat pump and ground source heat pump project is to be established; the specific process is as follows:
the collected foundation stability evaluation data comprise mining area coal seam mining historical records, mining area coal seam layer thickness distribution maps, mining area mining working face distribution maps, mining area geological mining data and mining subsidence area subsidence range;
the foundation stability evaluation method is that when the subsidence value of the ground surface point specified in annex 3 in the 'building, water body, railway and main roadway coal pillar reservation and coal mining standardization' is not more than 30mm in continuous 6 months, the ground surface movement period is considered to be ended, the ground surface reaches stable subsidence, and the foundation is stable; wherein the subsidence value of the surface point is monitored by using a total station, a level gauge or an RTK mapping instrument. The foundation stability evaluation method can also determine that the underground goaf is stable and the foundation is stable if apparent resistivity values obtained by using a transient electromagnetic method are distributed in a plane without difference. In this embodiment, the instruments for monitoring the dip value are a level gauge and an RTK, and the change value of the monitoring point in the last half year 2019 is shown in table 1 according to the monitoring.
Table 1 table of data change for monitoring mining subsidence area in the last half 2019 years
| Month of month | 1 | 2 | 3 | 4 | 5 | 6 |
| Dip value/mm | 0.1 | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 |
According to the monitoring data change table, the monitoring change values in the last half of 2019 are smaller than the ground subsidence values specified in the building, water body, railway and main roadway coal pillar reserving and pressed coal exploitation standard, and the area can be considered to be stable and sinking.
S2: geothermal and engineering data collection is carried out on a coal mining subsidence water accumulation area for refrigerating requirements, which is to be established for subsidence water source heat pump engineering, and the available energy is calculated; the specific process is as follows:
the collected geothermal and engineering data comprise water depth distribution of a coal mining subsidence ponding area, underwater topography distribution, rainfall, and temperature and water quality of each layer of water body of the ponding area; the water depth distribution, underwater topography distribution and rainfall of the coal mining subsidence water accumulation area are used for determining how the subsidence water accumulation source heat pump buried pipes are distributed, and the measuring method comprises, but is not limited to, unmanned ships, echo detectors and the like for measuring underwater topography and water depth. The rainfall of the coal mining subsidence water accumulation area is used for determining the water surface morphology change of the coal mining subsidence water accumulation area. The temperatures of the layers of the coal mining subsidence water accumulation zone are used for determining the available temperature range of the coal mining subsidence water accumulation zone, and the measuring method comprises, but is not limited to, measuring the temperatures of the layers of the coal mining subsidence water accumulation zone through a distributed optical fiber. The temperature test of each layer of the coal mining subsidence water accumulation area has the function of transmitting temperature data in real time, and the temperature data is transmitted to a subsidence water accumulation source heat pump heat exchange station in real time. The water quality of the coal mining subsidence water accumulation area is used for determining the pipe material of the ground source heat pump pipe and judging whether the water quality has the property of corrosiveness and other harm pipes. In the embodiment, the length of a certain coal face can reach 1400m, the width is 280m, and the depth of the deepest platform is 32m; the annual rainfall of the sinking ponding area reaches 700-1000 mm, and the sinking ponding area is concentrated for 7-9 months; the temperature of each region of the bottom layer of the coal mining subsidence water accumulation region is similar, and the annual temperature is 16 ℃; the water quality of the coal mining subsidence ponding area is good, and the III-class surface water standard is achieved at present.
Because the energy of the coal mining subsidence water accumulation area can only be used for refrigeration under the working condition of summer, the available energy of the coal mining subsidence water accumulation area under the working condition of summer refrigeration is calculated. The method for calculating available energy under the working conditions of refrigeration in summer comprises the steps of calculating available temperatures under different working conditions of different temperatures every day in a time-sharing manner every day under the condition of determining the optimal refrigeration temperature, and calculating total available energy every day, wherein the method comprises the following specific steps: by formula Q T ＝AC W ρ W ((T H - T S )t H V WH +(T M -T S )t M V WM +(T L -T S )t L V WL ) Calculating total energy available in one day of coal mining subsidence water accumulation area for refrigeration requirement, wherein A represents energy conversion efficiency, and C W Represents the specific heat capacity, ρ, of water body in the coal mining subsidence water accumulation area W Represents the water density of a coal mining subsidence ponding area T H The water body temperature T representing the high-temperature working condition in summer S Represents the optimal refrigeration temperature of the working condition in summer, t H V represents the working condition time of high temperature in summer WH Representing the volume of water body in a water subsidence area under high-temperature working condition, T M The water temperature t represents the temperature working condition in summer M V represents the working condition time of the temperature in summer WM Represents the volume of water body in the sinking ponding area under the medium temperature working condition,T L the water body temperature under the working condition of low temperature in summer is represented by t L V represents the working condition time of low temperature in summer WL Representing the volume of water in the sinking ponding area under the low-temperature working condition. In this embodiment, under the working condition in summer, the temperature of the best-used refrigeration facility is 26 ℃, the temperature of the bottom of the coal mining subsidence water accumulation area is 16 ℃, the maximum available temperature reaches 10 ℃, and the bottom of the coal mining subsidence water accumulation area can be calculated according to the principle of decreasing the temperature from the bottom of the coal mining subsidence water accumulation area to the upper part: the available temperature between 26 ℃ can be calculated according to a plurality of intervals because the temperature change of the surface layer of the water body day and night is larger, such as a temperature middle region at the early 7-11 times, a temperature high region at the 11-18 times, a temperature middle region at the 18-22 times and a temperature low region at the 22-next day 7 times, and a temperature low region 9h, a temperature middle region 8h and a temperature high region 7h can be calculated. T in formula of total energy available in one day of coal mining subsidence ponding area H 、 T M 、T L 30 ℃, 28 ℃, 24 ℃ and T respectively S At 26 ℃, V WH 7625827m 3 ，V WM 9150992m 3 ，V WL 11438740m 3 The final calculated available energy within a day is 1.843×10 15 kJ。
S3: geothermal and engineering data collection is carried out on abandoned drilling holes or newly-built drilling holes on the periphery of a coal mining subsidence area for heat supply requirements of a ground source heat pump engineering to be established, and available energy is calculated; the specific process is as follows:
collecting the data of the abandoned drilling holes at the periphery of the coal mining subsidence area, wherein the data comprise the preservation form of the drilling holes of the abandoned drilling holes, and various data of the abandoned drilling holes in the construction, construction and development stages, such as drilling time, construction purpose, drilling depth, drilling horizon, lithology of each layer, water yield, groundwater level, drilling temperature and the like; the drill hole preservation mode of the waste drill hole is collected to ensure that the waste drill hole can be used normally, if the waste drill hole cannot be used normally at all, the waste drill hole cannot be used for developing a ground source heat pump, if the deep part of the waste drill hole cannot be used, the shallow part of the waste drill hole can be used for developing the ground source heat pump.
Collecting newly built drilling data near a coal mining subsidence area, wherein the newly built drilling data comprise data such as the position of a newly built drilling hole, drilling depth, drilling positions, lithology of each layer, water yield, groundwater level, drilling temperature and the like; the drilling depth, drilling horizon, lithology of each layer, water yield, groundwater level and drilling temperature of abandoned or newly created holes near the coal mining subsidence area are used to determine the usable temperature of abandoned holes.
In this embodiment, in 2008, the drilling construction is performed for the purposes of drilling holes at the groundwater level and drilling depth of 900m, and the drilling layer reaches the Ortsea gray rock layer, specifically, see table 2. The underground water level in the sleeve is-200 m, the diameter of the drilled sleeve is 146mm during drilling construction, the depth of the constant temperature layer is 30m underground, the temperature of the constant temperature layer in the drilled hole is 17.5 ℃, and the ground temperature gradient of the drilled hole is 3.5 ℃/100m.
Table 2 table of lithology of drilling holes in coal mining subsidence area of certain mining area
| Sequence number | Depth/m | Average lithology |
| 1 | 0-400 | Loose layer |
| 2 | 400-500 | Siltstone rock |
| 3 | 500-600 | Mudstone |
| 4 | 600-800 | Sandy mudstone |
| 5 | 800-850 | Mudstone |
| 6 | 850-900 | Limestone |
Calculating the available temperature in the abandoned borehole, arranging double U-shaped buried pipes in the borehole, wherein the diameter of the double U-shaped buried pipes is DN32, and the optimal flow rate of water is 2m/S according to the ground source heat pump, wherein the optimal flow rate of water is 2m/S through the formula Q=A.k because of the deepest borehole depth of 900m, the ground temperature gradient and the constant temperature layer temperature z Calculating available energy of abandoned drilling holes or newly built drilling holes at the periphery of the coal mining subsidence area, wherein A is energy conversion efficiency and takes a value of 0.05 and k z Representing the comprehensive heat transfer coefficient, and taking the value of 2.8; delta T represents the difference between the average temperature of the circulating liquid of the double U-shaped buried pipe and the original temperature of the rock-soil body, and the temperature is 29.95 ℃; l represents the length of the heat exchange hole of the double U-shaped buried pipe, 900m, t represents the available time of day, 86400s and the available energy in one day can be calculated to be 3.26 multiplied by 10 8 kJ。
S4: constructing a sinking water-accumulating source heat pump and ground source heat pump circulating unit and a pipeline thereof related to the engineering of the sinking water-accumulating source heat pump and the ground source heat pump; the specific process is as follows:
arranging a subsidence water source heat pump heat exchange station or a ground source heat pump heat exchange station in the coal mining subsidence water accumulation area position, the abandoned drilling position or the newly-built drilling position and the energy use position distribution area based on the principle of economic optimum and energy loss minimization; a circulating pipeline used for being connected to an energy using unit is arranged in the sinking water accumulation source heat pump heat exchange station or the ground source heat pump heat exchange station, and heat preservation and insulation cotton is arranged on the circulating pipeline to reduce energy dissipation; in this embodiment, since the abandoned borehole is located outside the coal mining subsidence water accumulation area 10m, and the energy use position (a certain cell) is just outside the subsidence water accumulation area 30m, the ground source heat pump heat exchange station can be directly arranged between the cell and the water accumulation area, wherein the circulating pipeline is arranged in the ground source heat pump heat exchange station.
The method is characterized in that a plurality of double-U-shaped buried pipes are arranged in a coal mining subsidence ponding area and are respectively communicated with circulating pipelines in a subsidence ponding water source heat pump heat exchange station or a ground source heat pump heat exchange station, one end of each double-U-shaped buried pipe, which is in contact with the subsidence ponding water source heat pump heat exchange station or the ground source heat pump heat exchange station, is provided with a valve which is controlled to start and stop based on a PLC, when the energy required by a superior energy using unit is more, the PLC controls the opening of the valves of ports of different double-U-shaped buried pipes, and controls the flow rate of the valves to meet different user demands. The drilling layout of the coal mining subsidence water accumulation area is shown in fig. 2 and 3, and the reference numerals in the drawings are as follows: 1 is a coal mining subsidence ponding area; 2 is waste drilling or newly-built drilling; 3 is a buried pipe in a subsidence ponding area; 4 is a waste drilling hole or a newly-built drilling hole buried pipe; 5 is a cold water source heat exchange station; 6 is a hot water source heat exchange station; 7 is a cold water source circulating pipeline; 8 is a hot water source circulation pipeline, wherein the ground pipes are double U-shaped ground pipes, the cold water source heat exchange station 5 and the hot water source heat exchange station 6 are two subsidence water source heat pump heat exchange stations, the waste drilling holes or newly-built drilling holes ground pipes 4 and the ground pipes 3 of the coal mining subsidence water accumulation area 1 are communicated with the circulation pipelines of the cold water source heat exchange station 5 and the hot water source heat exchange station 6, the circulation pipelines of the cold water source heat exchange station 5 and the hot water source heat exchange station 6 are communicated with the pipelines of the energy use units, and thus the energy of the coal mining subsidence water accumulation area and the waste drilling holes or the newly-built drilling holes is utilized for supplying heat or refrigerating for the energy use units. The principle of heat supply is that cooled liquid is introduced into the double-U-shaped buried pipe and the circulating pipeline of the heat exchange station, then the liquid circulates in the double-U-shaped buried pipe and the circulating pipeline of the heat exchange station, the energy of the coal mining subsidence ponding area and the abandoned drilling or newly-built drilling area exchanges heat with the circulating liquid, and the circulating liquid takes away the energy of the drilling area and the deposition area for use by units needing energy. The principle of refrigeration is that the liquid for heating of the energy use unit is introduced into the circulation pipeline of the double-U-shaped buried pipe and the heat exchange station, then the liquid circulates in the circulation pipeline of the double-U-shaped buried pipe and the heat exchange station, cold flow of the coal mining subsidence ponding area and the waste drilling or newly-built drilling area exchanges heat with the circulating liquid, the circulating liquid takes away the energy of the drilling area and the deposition area, heat exchange is realized, and the liquid of the energy use unit in the circulation pipeline of the double-U-shaped buried pipe and the heat exchange station is cooled for the unit needing refrigeration.
The middle part of the coal mining subsidence ponding area is provided with a temperature testing device for monitoring the temperatures of different layers in the coal mining subsidence ponding area, and the temperature testing device transmits the temperatures of the different layers to a central control center of the subsidence water source heat pump heat exchange station or the ground source heat pump heat exchange station in real time, so that the valve opening amount is adjusted.
S5: when the energy usage unit demand energy is lower than the available energy, the starting mode of the sinking water source heat pump and the ground source heat pump circulating unit is adjusted according to the instantaneous actual energy consumption power, and when the energy usage unit demand energy is higher than the available energy, the sinking water source heat pump and the ground source heat pump circulating unit are not adopted for heating/refrigerating, and the specific process is as follows:
by calculating the instantaneous actual refrigeration load and the instantaneous actual heating load of the energy use unit, valves with different degrees are opened to supply the refrigeration load and the heating load of the energy use unit.
The instantaneous refrigeration load control valve comprises a statistical energy usage unit instantaneous refrigeration load, wherein the flow rate of liquid in a circulating pipe of a sinking water source heat pump heat exchange station is 2m/s at maximum under the condition of full opening of the valve, X scales are arranged on the valve, and when Y scales are opened in a rotating way, the flow rate is 2*X/Y m/s, wherein Y is less than or equal to X; when the layer temperature of the circulating pipe of the heat pump heat exchange station for laying the subsidence water source is t1, the flow rate of water in the pipe is 2m/S, the power is S, and the actual power of the energy use unit is S Real world ThenWherein, N is the number of valves with the valve opening degree of full opening, and N is the pipeline power which does not reach the opening of all the valves;
by the formulaThe valve opening degree of the pipeline which does not reach the opening of all valves is calculated.
In this embodiment, the flow rate of the liquid in the circulation pipe of the heat exchange station of the submerged water source heat pump is 2m/s at the highest speed under the optimal conditions of full opening and economy of the valve, 20 scales are arranged on the valve, when 4 scales are opened in a rotating way, the flow rate is 0.4m/s, when the layer temperature of the circulation pipe of the heat exchange station of the submerged water source heat pump is 16 ℃, the flow rate of the water in the pipe is 2m/s, the power is 100kW, and when the actual required power per unit of energy use is 250kW, the valve opening formula is calculated:
according to the calculation result, the number of valves with the fully opened valve opening degree is 2, namely 2 corresponding sinking water source heat pump pipelines for opening all the valves are provided, and the pipeline power for opening all the valves is 50kW;
the valve opening degree calculation method for the pipeline power which does not reach the opening of all valves comprises the following steps:
finally, 2 valves are fully opened, and another valve which is not fully opened is opened, wherein the opening degree is 10 gears.
The method of the instantaneous actual heating load control valve is to count the instantaneous heating load of the energy using unit, the liquid flow rate in the circulating pipe of the ground source heat pump heat exchange station is 2m/s at the highest speed under the condition of full opening of the valve, X scales are arranged on the valve, and when Y scales are opened in a rotating way, the flow rate is 2*X/Y m/s, wherein Y is less than or equal to X; when the temperature of the deepest layer of the circulating pipe of the heat exchange station of the ground source heat pump is t2, the flow rate of water in the pipe is 2m/S, the power is S', and the actual power of the energy use unit is S Real world ThenA valve is opened to the Y scale.
In this embodiment, the flow rate of the liquid in the circulation pipe of the ground source heat pump heat exchange station is 2m/s at the highest speed under the optimal conditions of full opening and economy of the valve, 20 scales are arranged on the valve, when 4 scales are opened in a rotating way, the flow rate is 0.4m/s, when the temperature of the deepest layer of the circulation pipe of the ground source heat pump heat exchange station is 50 ℃, the flow rate of the water in the pipe is 2m/s, the power is 1000kW, and when the actual required power per energy use unit is 400kW, the valve opening formula is calculated:
according to the calculation result, 8 gears of the 1 valve are finally opened.
Through the technical scheme, the invention provides a collaborative development and utilization technology of the ground source heat pump and the subsidence ponding source heat pump in the coal mining subsidence area, and the method comprises the steps of evaluating the foundation stability of the coal mining subsidence stable subsidence area, respectively collecting geothermal/engineering geological data of the coal mining subsidence ponding area and waste drilling holes at the periphery of the coal mining subsidence ponding area, and calculating the available energy; and then respectively constructing relevant infrastructures such as a subsidence water source heat pump/ground source heat pump heat exchange station, a laying coal mining subsidence water area ground buried pipe, a waste drilling hole or a newly built drilling hole ground buried pipe and the like in an area with refrigerating or heating requirements at the periphery of the coal mining subsidence water area, and finally adjusting the opening quantity of a circulating pipeline valve of the subsidence water source heat pump/ground source heat pump heat exchange station according to the instantaneous actual refrigerating load or the instantaneous actual heating load, thereby solving or at least partially solving the problems that the resource utilization of the existing coal mining subsidence area is less and the geothermal resource, the water resource and the land resource are seriously wasted in the coal mining subsidence area so as to expect to reduce the consumption of electric power resources.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The method for cooperatively utilizing the ground source heat pump and the subsidence water source heat pump in the coal mining subsidence area is characterized by comprising the following steps:
step one: performing foundation stability evaluation on a coal mining subsidence area where a subsidence water source heat pump and ground source heat pump project is to be established;
step two: the coal mining subsidence water accumulation area for refrigerating requirement of the subsidence water accumulation source heat pump engineering to be established is passed through the formula Q T ＝AC W ρ W ((T H -T S )t H V WH +(T M -T S )t M V WM +(T L -T S )t L V WL ) Geothermal and engineering data collection is performed and available energy is calculated, wherein A represents energy conversion efficiency and C W Represents the specific heat capacity, ρ, of water body in the coal mining subsidence water accumulation area W Represents the water density of a coal mining subsidence ponding area T H The water body temperature T representing the high-temperature working condition in summer S Represents the optimal refrigeration temperature of the working condition in summer, t H V represents the working condition time of high temperature in summer WH Representing the volume of water body in a water subsidence area under high-temperature working condition, T M The water temperature t represents the temperature working condition in summer M V represents the working condition time of the temperature in summer WM Representing the volume of water body in a sinking ponding area under medium temperature working conditions, T L The water body temperature under the working condition of low temperature in summer is represented by t L V represents the working condition time of low temperature in summer WL Representing the volume of water in a sinking ponding region under a low-temperature working condition;
step three: geothermal and engineering data collection is carried out on abandoned drilling holes or newly-built drilling holes on the periphery of a coal mining subsidence area for heat supply requirements of a ground source heat pump engineering to be established, and available energy is calculated;
step four: constructing a sinking water-accumulating source heat pump and ground source heat pump circulating unit and a pipeline thereof related to the engineering of the sinking water-accumulating source heat pump and the ground source heat pump;
step five: when the energy usage unit demand energy is lower than the available energy, the starting mode of the sinking water source heat pump and the ground source heat pump circulating unit is adjusted according to the instantaneous actual energy consumption power, and when the energy usage unit demand energy is higher than the available energy, the sinking water source heat pump and the ground source heat pump circulating unit are not used for heating/refrigerating.
2. The method for co-using a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area according to claim 1, wherein the first step comprises:
step 101: collecting foundation stability evaluation data, wherein the collected foundation stability evaluation data comprise mining area coal seam mining historical records, mining area coal seam layer thickness distribution maps, mining area mining working face distribution maps, mining area geological mining data and mining subsidence area subsidence range;
step 102: the foundation stability evaluation method is that when the subsidence value of the ground surface point is not more than 30mm for 6 months continuously, the ground surface movement period is considered to be ended, the ground surface reaches stable subsidence, and the foundation is stabilized; wherein the subsidence value of the surface point is monitored by using a total station, a level gauge or an RTK mapping instrument.
3. The method for collaborative utilization of a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area according to claim 1, wherein the method for evaluating the stability of the foundation further comprises: and if apparent resistivity values obtained by using a transient electromagnetic method are distributed in a plane without difference, determining that the underground goaf is stable and the foundation is stable.
4. The method for co-using a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area according to claim 1, wherein the second step comprises:
the collected geothermal and engineering data comprise water depth distribution of a coal mining subsidence ponding area, underwater topography distribution, rainfall, and temperature and water quality of each layer of water body of the ponding area; the water depth distribution, the underwater topography distribution and the rainfall of the coal mining subsidence water accumulation area are used for determining how the buried pipes of the subsidence water accumulation source heat pump are distributed, the rainfall of the coal mining subsidence water accumulation area is used for determining the water surface form change of the coal mining subsidence water accumulation area, the temperature of each layer of the coal mining subsidence water accumulation area is used for determining the available temperature range of the coal mining subsidence water accumulation area, the water quality of the coal mining subsidence water accumulation area is used for determining the pipe materials of the ground source heat pump pipes, and whether the water quality has the property of endangering the pipes is judged.
5. The method for co-using a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area according to claim 1, wherein the third step comprises:
collecting the data of abandoned drilling holes at the periphery of the coal mining subsidence area, wherein the data comprise the drilling hole preservation form of the abandoned drilling holes, the drilling time of the abandoned drilling holes in the construction, construction and development stages, the construction purpose, the drilling depth, the drilling horizon, the lithology of each layer, the water yield, the groundwater level and the drilling hole temperature;
collecting newly built drilling data near a coal mining subsidence area, wherein the newly built drilling data comprise the position, drilling depth, drilling horizon, lithology of each layer, water yield, groundwater level and drilling temperature;
by the formula q=a·k z Calculating available energy of abandoned or newly built holes at the periphery of the coal mining subsidence area, wherein k is z The comprehensive heat transfer coefficient is represented by DeltaT, the difference between the average temperature of circulating liquid of the double-U-shaped buried pipe and the original temperature of the rock-soil body is represented by L, the length of a heat exchange hole of the double-U-shaped buried pipe is represented by L, and the time of day is represented by T.
6. The method for co-using a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area according to claim 1, wherein the fourth step comprises:
arranging a subsidence water source heat pump heat exchange station or a ground source heat pump heat exchange station in a coal mining subsidence water accumulation area position, a waste drilling hole position or a newly-built drilling hole position and an energy use position distribution area; a circulating pipeline used for being connected to an energy using unit is arranged in the sinking water accumulation source heat pump heat exchange station or the ground source heat pump heat exchange station, and heat preservation and insulation cotton is arranged on the circulating pipeline;
the method is characterized in that a plurality of double-U-shaped buried pipes are arranged in a coal mining subsidence ponding area and are respectively communicated with circulating pipelines in a subsidence ponding water source heat pump heat exchange station or a ground source heat pump heat exchange station, one end of each double-U-shaped buried pipe, which is in contact with the subsidence ponding water source heat pump heat exchange station or the ground source heat pump heat exchange station, is provided with a valve which is controlled to start and stop based on a PLC, when the energy required by a superior energy using unit is more, the PLC controls the opening of the valves of ports of different double-U-shaped buried pipes, and controls the flow rate of the valves to meet different user demands.
7. The method for cooperatively utilizing the ground source heat pump and the submerged water source heat pump in the coal mining subsidence area according to claim 6, wherein a temperature testing device for monitoring different layers in the coal mining subsidence water accumulation area is arranged in the middle of the coal mining subsidence water accumulation area, and the temperature testing device transmits the water temperatures of the different layers to a central control center of the submerged water source heat pump heat exchange station or the ground source heat pump heat exchange station in real time.
8. The method for co-using a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area according to claim 6, wherein the fifth step comprises:
the flow rate of liquid in a circulating pipe of the sinking water-logging heat pump heat exchange station is 2m/s at the highest speed under the condition of fully opening a valve, X scales are shared on the valve, and when Y scales are opened in a rotating mode, the flow rate is 2*X/Y m/s, wherein Y is less than or equal to X; when the layer temperature of the circulating pipe of the heat pump heat exchange station for laying the subsidence water source is t1, the flow rate of water in the pipe is 2m/S, the power is S, and the actual power of the energy use unit is S Real world ThenWherein, N is the number of valves with the valve opening degree of full opening, and N is the pipeline power which does not reach the opening of all the valves;
by the formulaThe valve opening degree of the pipeline which does not reach the opening of all valves is calculated.
9. The method for co-using a ground source heat pump and a subsidence water source heat pump in a coal mining subsidence area according to claim 6, wherein the fifth step further comprises:
the flow rate of liquid in a circulating pipe of the ground source heat pump heat exchange station is 2m/s at the highest speed under the condition of full opening of a valve, X scales are arranged on the valve, and when Y scales are opened in a rotating mode, the flow rate is 2*X/Y m/s, wherein Y is less than or equal to X; when the temperature of the deepest layer of the circulating pipe of the heat exchange station of the ground source heat pump is t2, the flow rate of water in the pipe is 2m/S, the power is S', and the actual power of the energy use unit is S Real world ThenA valve is opened to the Y scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210711508.7A CN115111810B (en) | 2022-06-22 | 2022-06-22 | Method for cooperatively utilizing ground source heat pump and subsidence water accumulation source heat pump in coal mining subsidence area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210711508.7A CN115111810B (en) | 2022-06-22 | 2022-06-22 | Method for cooperatively utilizing ground source heat pump and subsidence water accumulation source heat pump in coal mining subsidence area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115111810A CN115111810A (en) | 2022-09-27 |
| CN115111810B true CN115111810B (en) | 2024-02-06 |
Family
ID=83329120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210711508.7A Active CN115111810B (en) | 2022-06-22 | 2022-06-22 | Method for cooperatively utilizing ground source heat pump and subsidence water accumulation source heat pump in coal mining subsidence area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115111810B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130058148A (en) * | 2011-11-25 | 2013-06-04 | 한국지질자원연구원 | Heating and cooling system using space in abandoned mine |
| CN103954078A (en) * | 2014-05-27 | 2014-07-30 | 张宇擎 | Method for extracting coal mine underground rock heat by adopting heat pump system |
| CN113027528A (en) * | 2021-04-26 | 2021-06-25 | 栗恒 | Underground energy storage and energy utilization method for abandoned mine |
| CN113432322A (en) * | 2021-07-02 | 2021-09-24 | 山东科技大学 | Comprehensive utilization method and test equipment for surface water, goaf and geothermal heat of coal mining subsidence area |
| CN114508867A (en) * | 2022-01-28 | 2022-05-17 | 中国地质科学院郑州矿产综合利用研究所 | Photovoltaic-pumped storage-geothermal combined development and utilization system for abandoned coal mine and construction method |
-
2022
- 2022-06-22 CN CN202210711508.7A patent/CN115111810B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130058148A (en) * | 2011-11-25 | 2013-06-04 | 한국지질자원연구원 | Heating and cooling system using space in abandoned mine |
| CN103954078A (en) * | 2014-05-27 | 2014-07-30 | 张宇擎 | Method for extracting coal mine underground rock heat by adopting heat pump system |
| CN113027528A (en) * | 2021-04-26 | 2021-06-25 | 栗恒 | Underground energy storage and energy utilization method for abandoned mine |
| CN113432322A (en) * | 2021-07-02 | 2021-09-24 | 山东科技大学 | Comprehensive utilization method and test equipment for surface water, goaf and geothermal heat of coal mining subsidence area |
| CN114508867A (en) * | 2022-01-28 | 2022-05-17 | 中国地质科学院郑州矿产综合利用研究所 | Photovoltaic-pumped storage-geothermal combined development and utilization system for abandoned coal mine and construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115111810A (en) | 2022-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103090571B (en) | Method of circular mining geothermal resources | |
| CN109614753A (en) | A kind of heat hiding engineering evaluation method for geothermal energy resources | |
| Kallio | Geothermal energy use, Country update for Finland | |
| Andersson et al. | UTES (Underground Thermal Energy Storage)-Applications and Market Development in Sweden | |
| CN108222831A (en) | Multidirectional geothermal well and high-efficiency mining hot dry rock method | |
| CN115111810B (en) | Method for cooperatively utilizing ground source heat pump and subsidence water accumulation source heat pump in coal mining subsidence area | |
| Zhao et al. | Dynamic numerical investigation of the long-term performance of a GSHP system considering groundwater seepage and layered subsurface coupling conditions | |
| CN115325727B (en) | Method for developing ground source heat pump by utilizing waste or closed mine geothermal resource | |
| CN112413912B (en) | Middle-deep layer closed geothermal energy heat supply system and design method thereof | |
| CN104654641A (en) | Method for heating surface water by using natural heating furnace of the Earth | |
| CN114201797A (en) | Design method and device for middle-deep buried pipe heat pump heating system | |
| CN210441697U (en) | Water well type spiral ground heat exchanger and heat exchange system | |
| CN217466501U (en) | Static drilling root planting energy pile model experimental device with underground water | |
| Du et al. | Study on the simulation and optimization of the heat transfer scheme in a buried-pipe ground-source heat pump | |
| Sun et al. | A geothermal energy heat exchange system suitable for abandoned mines and its optimization | |
| Liu et al. | Vertical U-shaped heat exchangers for construction engineering: New promises and future challenges | |
| CN114964551B (en) | Ground source heat pump monitoring method | |
| CN113203213B (en) | Novel ground source heat pump system of artificial aquifer combined with shallow coaxial sleeve | |
| CN220187002U (en) | Soil-water composite cross-season energy storage device | |
| Wang et al. | Estimation of shallow geothermal potential to meet heating demand in a building scale | |
| Friberg | Seasonal Storage of Distant Industrial Excess Heat for District Heating | |
| Hou et al. | Establishment of evaluation model for shallow geothermal energy resource development potential based on characteristic of geotemperature | |
| CN117928001A (en) | Deep geothermal heating system suitable for ultra-large area heating | |
| CN117387232A (en) | Geothermal resource exploitation method based on roadway engineering | |
| Liu et al. | Numerical investigation of closed-loop heat extraction in different-layout geothermal wells with particular reference to thermal interference analyses |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |