CN110631271A - Medium-deep underground rock heat type heat supply system and heat supply method - Google Patents
Medium-deep underground rock heat type heat supply system and heat supply method Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 46
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- 238000005086 pumping Methods 0.000 claims abstract description 46
- 239000002689 soil Substances 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 23
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
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- 229910000851 Alloy steel Inorganic materials 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T50/00—Geothermal systems
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- 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
- F25B30/02—Heat pumps of the compression type
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- 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
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T2010/50—Component parts, details or accessories
- F24T2010/56—Control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a medium-deep underground rock heat type heating system, which comprises: at least one underground medium-deep rock-soil heat exchange system, an overground heat auxiliary system, a heat supply tail end heat circulation system and a control system; when the temperature of a heat exchange medium for finishing heat exchange through the underground medium-deep rock-soil heat exchange system reaches a preset temperature, the heat exchange medium is transmitted to a heat supply tail end heat circulation system through a direct supply device of the overground heat auxiliary system; when the heat exchange medium does not reach the preset temperature, the heat exchange medium is heated by a heat exchange temperature raising pumping device of the overground heat auxiliary system and then is transmitted to a heat circulation system at the heat supply tail end. The invention solves the problems that the prior water source heat pump pollutes water environment and the heat source is not stable enough, effectively prevents the pollution of water resource and can provide continuous and stable heat source.
Description
Technical Field
The invention relates to the technical field of geothermal energy development, in particular to a middle-deep underground rock heat type heat supply system and a middle-deep underground rock heat type heat supply method.
Background
The shallow geothermal energy is stored in water, soil and rock at 25 deg.c in the depth of 200m from earth surface to underground, and may be used in heat pump technology to extract geothermal energy for heating and cooling building. The shallow geothermal energy utilization system mainly comprises a water source heat pump heating system and a soil source heat pump heating system. The former needs to pump underground water, has strict requirements on water temperature, water yield, silt content, same-layer recharge and water pollution control, and is limited or even forbidden to be used in many places; the latter requires balanced heat taking and heat supplementing, but in the northern area with low refrigeration demand in summer, the thermal compensation of the soil is seriously insufficient, so that the heat supply effect of the soil source heat pump is not ideal.
The recently emerging technology of dry and hot rock utilization, the term geothermal energy (NB/T10097-2018) defines it as an abnormally high temperature rock mass with no or only a small amount of fluid inside, and a temperature higher than 180 ℃. The hot dry rock is mainly used for power generation internationally to distinguish the medium-deep hydrothermal geothermal technology for heating. From the perspective of economic exploitation and utilization, the hot dry rock mining conditions are not available anywhere. The system has no general applicability in terms of resource conditions and technical difficulties.
Disclosure of Invention
The method aims at the problems that the traditional water source heat pump is difficult in potential water pollution and co-layer recharging, the soil source heat pump is insufficient in thermal compensation, the hot dry rock exploitation is economical and general applicability is not available, and the like. The invention provides a medium-deep underground rock heat type heat supply system and a heat supply method.
In order to solve the above technical problems, according to an aspect of the present invention, there is provided a medium-deep underground rock-heat type heating system including: at least one underground medium-deep rock-soil heat exchange system, an overground heat auxiliary system, a heat supply tail end heat circulation system and a control system;
the underground middle-deep rock-soil heat exchange system is used for enabling a heat exchange medium to exchange heat with underground middle-deep rock-soil;
the above-ground heat auxiliary system is connected to the underground medium-deep rock-soil heat exchange system, and comprises:
the heat exchange temperature raising pumping device is used for raising the temperature of the heat exchange medium when the temperature of the heat exchange medium subjected to heat exchange is lower than a first preset temperature, and conveying the heat exchange medium subjected to temperature raising to the heat supply tail end heat circulation system; and
the direct supply device is used for conveying the heat exchange medium to the heat supply tail end heat circulation system when the temperature of the heat exchange medium subjected to heat exchange is greater than or equal to the first preset temperature;
the heat supply end heat circulation system is connected to the overground heat auxiliary system to exchange heat of the heat exchange medium conveyed by the overground heat auxiliary system;
and the control system is used for controlling the overground heat auxiliary system according to the magnitude relation between the temperature of the heat exchange medium and the first preset temperature.
Further, the heat exchange system for the underground medium-deep rock soil comprises: the double-layer sleeve and the high-efficiency heat exchange terminal;
the double-layer sleeve comprises an inner layer sleeve and an outer layer sleeve, the lower end of the outer layer sleeve is connected to the efficient heat exchange terminal, and the heat exchange medium is injected from the inner layer sleeve, exchanges heat with underground medium-deep rock soil through the efficient heat exchange terminal and then is conveyed to the overground heat auxiliary system through the outer layer sleeve.
Further, the high-efficient heat transfer terminal includes: the high-strength alloy sleeve, the high-efficiency heat exchanger and the high-efficiency heat transfer medium;
the high-strength alloy sleeve is connected to the high-efficiency heat exchanger, and the high-efficiency heat transfer medium is filled in the high-strength alloy sleeve and the gap between the high-efficiency heat exchanger and the underground middle and deep rock soil so as to increase the heat exchange efficiency of the underground middle and deep rock soil and the heat exchange medium.
Furthermore, the outer side of the upper part of the outer casing is also provided with a heat insulation layer to prevent the heat exchange medium from quickly losing when flowing through the ground surface through the outer casing.
Further, the heat supply system for the medium-deep underground rock heat type further comprises: a first three-way pipe, wherein the first end of the first three-way pipe is connected to the upper end of the outer casing pipe, the second end of the first three-way pipe is connected to one end of the heat exchange and temperature raising pumping device, and the third end of the first three-way pipe is connected to the tail end heat circulation system; and
a first end of the second three-way pipe is connected to the upper end of the inner sleeve, a second end of the second three-way pipe is connected to one end of the heat exchange temperature raising pumping device, and a third end of the second three-way pipe is connected to the tail end heat circulation system;
the other end of the heat exchange and temperature raising pumping device is connected to the third end of the first three-way pipe through a first connecting pipe, and the other end of the heat exchange and temperature raising pumping device is connected to the third end of the second three-way pipe through a second connecting pipe.
Furthermore, the control system comprises a first temperature control device, a first control valve, a second control valve, a third control valve and a second temperature control device;
the first temperature control device is arranged at a first end of the first three-way pipe, the first control valve is arranged at a third end of the first three-way pipe, the second control valve is arranged at a second end of the second three-way pipe, the third control valve is arranged at a third end of the second three-way pipe, and the second temperature control device is arranged at the second connecting pipe;
the second temperature control device controls the heat exchange temperature raising pumping device to operate according to the temperature of the heat exchange medium in the second connecting pipe and a second preset temperature.
Furthermore, pipeline pumps are arranged at the first end of the first three-way pipe, the first end of the second three-way pipe and the third end of the first three-way pipe to provide kinetic energy for conveying the heat exchange medium.
Further, the heat exchange temperature raising pumping device comprises: an evaporator, a compressor, and a condenser.
According to another aspect of the present invention, there is provided a medium-depth underground rock-heat type heating method for use in any one of the above-described medium-depth underground rock-heat type heating systems, the method including: acquiring the current temperature of a heat exchange medium conveyed by an underground medium-deep rock-soil heat exchange system;
judging whether the current temperature is lower than a preset temperature or not to obtain a judgment result;
and controlling the heat exchange medium to be transmitted to a heat supply tail end heat circulation system through a heat exchange temperature raising pumping device or a direct supply device according to the judgment result.
Further, the step of controlling the heat exchange medium to be transmitted to the heat supply tail end heat cycle system through the heat exchange temperature raising pumping device or the direct supply device according to the judgment result comprises the following steps:
when the current temperature is lower than the preset temperature, the heat exchange medium is conveyed to the heat exchange temperature raising pumping device, so that after the heat exchange medium is raised in temperature by the heat exchange temperature raising pumping device, the heat exchange medium is conveyed to the heat supply tail end heat circulation system;
and when the current temperature is greater than or equal to the preset temperature, conveying the heat exchange medium to the direct supply device so as to convey the heat exchange medium to the heat supply tail end heat circulation system through the direct supply device.
Compared with the prior art, the invention has obvious advantages and beneficial effects. By means of the technical scheme, the medium-deep underground rock heat type heating system and the heating method can achieve considerable technical progress and practicability, have industrial wide utilization value and at least have the following advantages:
(1) the heat is supplied by using the underground rock heat resources in the middle and deep layers with huge reserves and stable heat sources, and the problem of air pollution caused by coal-fired heating is solved.
(2) During the heat exchange process, underground water resources are not extracted, and pollution to the underground water resources is avoided.
(3) Through the setting of heat transfer temperature raising pumping device for when heat transfer medium temperature can't reach the demand temperature, can carry out the temperature raising to heat transfer medium effectively, and then guaranteed the terminal heat supply effect of heat supply.
(4) By filling the efficient heat transfer medium between the underground medium-deep rock soil and the efficient heat exchanger, the heat exchange efficiency is effectively improved.
(5) The heat-insulating layer is additionally arranged on the upper part of the outer-layer sleeve, so that heat energy loss caused by the heat exchange medium flowing through the ground surface is effectively avoided.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 shows a schematic block diagram of a medium depth subsurface rock-heat type heating system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a medium-deep underground rock-heat type heating method according to an embodiment of the invention.
[ description of main symbols ]
1: underground medium-deep rock-soil heat exchange system
10: middle-deep rock soil
11: double-layer sleeve
111: outer casing
112: inner casing
12: high-efficiency heat exchange terminal
121: high-strength alloy sleeve
122: high-efficiency heat exchanger
123: high efficiency heat transfer medium
13: heat insulation layer
2: overground heat auxiliary system
21: heat exchange temperature raising pumping device
211: evaporator with a heat exchanger
212: compressor with a compressor housing having a plurality of compressor blades
213: condenser
22: direct supply device
3: heat supply tail end heat circulation system
31: heat supply pipe network
32: terminal heat dissipation device
4: control system
41: first temperature control device
42: first idle valve
43: second control valve
44: third control valve
45: second temperature control device
5: first three-way pipe
6: second three-way pipe
51. 61: first end
52. 62: second end
53. 63: third terminal
7: first connecting pipe
8: second connecting pipe
9: pipeline pump
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to specific embodiments and effects of a medium-deep underground rock-heat type heating system and a heating method according to the present invention with reference to the accompanying drawings and preferred embodiments.
An embodiment of the present invention provides a medium-deep underground rock heat type heating system, as shown in fig. 1, including: the system comprises at least one underground medium-deep rock-soil heat exchange system 1, an overground heat auxiliary system 2, a heat supply tail end heat circulation system 3 and a control system 4.
Wherein, the underground middle and deep rock soil heat exchange system 1 can be one (as shown in figure 1), and according to the actual requirement of the heat supply end heat cycle system 3, the underground middle and deep rock soil heat exchange system 1 can also be connected to the ground heat auxiliary system 2 in a series-parallel connection mode so as to ensure that sufficient heat energy can be provided.
In order to obtain the heat energy of the underground middle-deep rock soil 10, a drilling machine needs to be used for drilling from the ground surface to the middle-deep rock soil 10, and the underground middle-deep rock soil heat exchange system 1 is arranged in a well. Specifically, according to the local geological temperature condition and the heat energy demand, the well diameter is 150 mm-300 mm, and the well depth is 600-3000 m.
In an embodiment, the underground medium-depth rock-soil heat exchange system 1 may include a double-layer sleeve 11 and a high-efficiency heat exchange terminal 12, wherein the high-efficiency heat exchange terminal 12 is connected to a lower end of an outer sleeve 111 of the double-layer sleeve 11, a heat exchange medium is injected into an upper end of an inner sleeve 112, the heat exchange medium flows through the lower end of the inner sleeve 112 and then exchanges heat with the underground medium-depth rock-soil 10 through the high-efficiency heat exchange terminal 12, and the heat exchange medium completing the heat exchange is led out through the outer sleeve 111.
In one embodiment, the high-efficiency heat exchange terminal 12 comprises a high-strength alloy sleeve 121, a high-efficiency heat exchanger 122 and a high-efficiency heat transfer medium 123. The high-efficiency heat exchanger 122 can be effectively protected from being damaged by the high-strength alloy casing 121, so as to ensure the stability of the underground medium-deep rock-soil heat exchange system 1. The high-efficiency heat exchanger 122 is made of a high-strength nickel steel alloy material, and the mechanical strength of the high-efficiency heat exchanger is ensured, and the heat exchange efficiency of the high-efficiency heat exchange terminal 12 can be effectively improved. Of course, the high efficiency heat exchanger 122 may be made of other materials, and the invention is not limited thereto. In order to further improve the heat exchange efficiency, the gaps between the underground medium-deep rock soil 10 and the high-strength alloy casing 121 and the high-efficiency heat exchanger 122 are filled with high-efficiency heat transfer media 123. The high-efficiency heat transfer medium 123 is formed by mixing and stirring materials such as cement, a coagulant, a fluid loss additive, a dispersing agent, granulated blast furnace slag and the like, and is densely filled in gaps among the high-strength alloy sleeve 121, the high-efficiency heat exchange terminal 12 and the medium-deep rock soil 10 in a pumping mode.
Further, in order to prevent the heat exchange medium after heat exchange from flowing through the upper part of the outer casing 111, the heat energy of the heat exchange medium is rapidly lost due to soil, gravel, water layer and the like on the ground surface, the upper part of the outer casing 111 is provided with the heat insulation layer 13, and in order to effectively play a heat insulation effect, the heat insulation layer 13 can be a sprayed nano heat insulation material, a polyvinyl chloride foamed heat insulation pipe, outer-layer poured polymer heat insulation mortar and the like.
In one embodiment, the heat exchange medium may be water, but may also be other materials that transfer heat faster.
In an embodiment, the above-ground heat auxiliary system 2 includes a heat exchange and temperature raising pumping device 21 for raising the temperature of the heat exchange medium subjected to heat exchange by the underground medium-depth rock-soil heat exchange system 1, and a direct supply device 22 for directly conveying the heat exchange medium subjected to heat exchange to the heat supply end heat circulation system 3. The heat exchange system 1 of the underground medium-deep rock soil 10 is organically communicated with the heat supply tail end heat circulation system 3 through a heat exchange temperature raising pumping device 21 and a direct supply device 22.
Specifically, a first end 51 of the first tee pipe 5 is connected to the upper end of the outer casing 111, a second end 52 is connected to one end of the heat exchange temperature raising pumping device 21, and a third end 53 is connected to the heat supply tail end heat cycle system 3; the first end 61 of the second tee pipe 6 is connected to the upper end of the inner casing 112, the second end 62 is connected to one end of the heat exchange and temperature raising pumping device 21, and the third end 63 is connected to the heat supply tail end heat cycle system 3. Meanwhile, two ends of the first connecting pipe 7 are respectively connected to the other end of the heat exchange temperature raising pumping device 21 and the third end 53 of the first three-way pipe 5, and the second connecting pipe 8 is respectively connected to the other end of the heat exchange temperature raising pumping device 21 and the third end 63 of the second three-way pipe 6.
Therefore, when the heat exchange medium is water, the first three-way pipe 5 and the first connecting pipe 7 are hot water pipes, and the second three-way pipe 6 and the second connecting pipe 8 are cold water pipes.
In one embodiment, third end 53 of first tee 5 and third end 63 of second tee 6 comprise direct feed system 22.
In order to realize the conversion between the heat exchange and temperature raising pumping device 21 and the direct supply device 22, as shown in fig. 1, the control system 4 includes a first temperature control device 41 disposed at the second end 52 of the first tee pipe 5, a second temperature control device 45 disposed at the second connecting pipe 8, a first control valve 42 disposed at the third end 53 of the first tee pipe 5, a second control valve 43 disposed at the second end 62 of the second tee pipe 6, and a third control valve 44 disposed at the third end 63 of the second tee pipe 6.
In an embodiment, when the first temperature control device 41 detects that the temperature of the heat exchange medium (e.g., hot water) conveyed by the outer casing 111 is lower than a first preset temperature (i.e., lower than a required temperature), the first control valve 42 and the third control valve 44 are controlled to be closed, the second control valve 43 is controlled to be opened, and then the heat exchange medium is conveyed to the heat exchange temperature raising pumping device 21 through the second end 52 of the first three-way pipe 5, so as to raise the temperature of the heat exchange medium which does not reach the required temperature, and the raised heat exchange medium is conveyed to the heat supply end heat circulation system 3 through the first connecting pipe 7 and the third end 53 of the first three-way pipe 5. Meanwhile, the heat exchange medium (for example, cold water) which is subjected to heat exchange in the heat circulation system 3 at the heat supply end is conveyed to the heat exchange temperature raising pumping device 21 through the third end 62 and the second connecting pipe 8 of the second tee pipe 6, and further conveyed to the inner casing 112 through the second end 62 and the first end 61 of the second tee pipe 6, so that the circulation of the heat exchange medium is realized.
When the second temperature control device 45 detects that the temperature of the heat exchange medium (for example, cold water) in the second connecting pipe 8 is lower than a second preset temperature, it indicates that the heat circulation system 3 at the heat supply end has a large demand for heat energy, and the heat exchange medium at the current temperature cannot meet the demand, the heat exchange temperature raising pumping device 21 is controlled to operate to raise the temperature of the heat exchange medium; when the second temperature control device 45 detects that the temperature of the heat exchange medium (for example, cold water) in the second connecting pipe 8 is greater than or equal to the second preset temperature, which indicates that the heat supply end heat circulation system 3 has a small demand for heat energy, the heat exchange temperature raising pumping device 21 is controlled to be turned off to operate, so that when the heat supply end heat circulation system 3 has a small demand for heat energy, the loss of the heat exchange temperature raising pumping device 21 can be reduced, and the purpose of saving energy is achieved.
In an embodiment, the heat exchange temperature raising pumping device 21 comprises an evaporator 211, a compressor 212 and a condenser 213, and specifically, the heat exchange medium enters the evaporator 211 through the second end 52 of the first tee pipe 5, is compressed by the compressor 212 to raise the temperature, and is raised by the condenser 213 to meet the requirement of the heat supply end heat cycle system 3.
In another embodiment, when the first thermostat 41 detects that the temperature of the heat exchange medium (e.g., hot water) conveyed by the outer casing 111 is greater than or equal to the first preset temperature (i.e., meets the demand temperature), the first control valve 42 and the third control valve 44 are controlled to be opened, and the second control valve 43 is controlled to be closed, so as to directly convey the heat exchange medium conveyed by the outer casing 111 to the heat supply end heat cycle system 3 through the third end 53 of the first tee pipe 5. Meanwhile, the heat exchange medium (for example, cold water) which is subjected to heat exchange in the heat supply end heat circulation system 3 is conveyed to the inner casing 112 through the third end 63 of the second tee pipe 6 and the first end 61 of the second tee pipe 6, so that the circulation of the heat exchange medium is realized.
In a specific embodiment, the first temperature control device 41 and the second temperature control device 45 may be PLC temperature controllers, so as to control the control valve and the heat exchange and temperature raising pumping device 21 according to different temperatures.
In an embodiment, the heat supply end heat cycle system 3 includes a heat supply pipe network 31 and an end heat dissipation device 32, and the end heat dissipation device 32 may be an indoor radiator, a floor heating pipe coil, or a fan pipe coil.
In order to enable the heat exchange medium to be rapidly conveyed and meet the heat energy requirement of the heat supply tail end heat circulation system 3, the first end 51 of the first three-way pipe 5, the first end 61 of the second three-way pipe 6 and the third end 53 of the first three-way pipe 5 are respectively provided with a pipeline pump 9 so as to ensure the kinetic energy of the circulation of the heat exchange medium. Of course, a plurality of pipeline pumps 9 may be provided according to actual requirements, such as transmission distance, and the like, without being limited thereto.
An embodiment of the present invention further provides a medium-deep underground rock heat type heating method, which is used in any one of the above-mentioned medium-deep underground rock heat type heating systems, as shown in fig. 2, and the heating method includes:
and step S10, acquiring the current temperature of the heat exchange medium conveyed by the underground medium-deep rock-soil heat exchange system.
Specifically, due to factors such as geographical environment and heat supply demand, the temperature demands of the heat circulation systems at the heat supply ends on the heat exchange medium are different, so that after the heat exchange medium exchanges heat with underground medium-deep rock and soil through the underground medium-deep rock and soil heat exchange system, the current temperature of the heat exchange medium needs to be detected, and a corresponding overground heat auxiliary system is selected according to different current temperatures.
And step S20, judging whether the current temperature is less than a preset temperature to obtain a judgment result.
Specifically, after the current temperature of the heat exchange medium is obtained, the current temperature needs to be compared with a preset temperature (i.e., a first preset temperature), and different aboveground heat auxiliary systems are controlled according to different comparison results to convey the heat exchange medium to the heat circulation system at the heat supply end. The preset temperature is the temperature of the heat exchange medium required by the heat supply tail end heat circulation system, and the temperature requirements of different heat supply tail end heat circulation systems on the heat exchange medium are different, so that the preset temperature can be set according to the actual requirements.
And step S30, controlling the heat exchange medium to be transmitted to a heat supply tail end heat circulation system through a heat exchange temperature raising pumping device or a direct supply device according to the judgment result.
Specifically, when the current temperature of the heat exchange medium is lower than the preset temperature, it is indicated that the temperature of the heat exchange medium fails to reach the temperature required by the heat circulation system at the end of heat supply, and therefore the temperature of the heat exchange medium needs to be raised. And then the heat exchange medium needs to be conveyed to a heat exchange temperature raising pumping device, so that the heat exchange medium is raised in temperature by the heat exchange temperature raising pumping device and then conveyed to a heat circulation system at the tail end of the heat supply.
The specific temperature raising method is described in detail above, and will not be described herein again.
When the current temperature of the heat exchange medium is greater than or equal to the preset temperature, the temperature of the heat exchange medium is indicated to meet the temperature required by the heat supply tail end heat circulation system, and therefore the heat exchange medium is conveyed to the heat supply tail end heat circulation system only through the direct supply device.
The switching mode between the heat exchange and temperature raising pumping device and the direct supply system is described in detail above, and is not described herein again.
According to the heat supply system and the heat supply method for the medium-deep underground rock heat, the heat exchange medium directly exchanges heat with the medium-deep rock through the underground medium-deep rock heat exchange system, underground water cannot be extracted, the environment is not interfered, the heat source is continuous and stable, the investment is economical, the requirement on the use environment is low, and the heat supply method is convenient to popularize. Through the setting of heat transfer temperature raising pumping installations and direct supply device for when the heat of middle and deep ground is not enough, still can raise the temperature to heat transfer medium through heat transfer temperature raising pumping installations, with the demand of guaranteeing the terminal heat cycle system of heat supply to heat energy, when the heat of middle and deep ground is sufficient, the accessible directly supplies the system and directly carries heat transfer medium to the terminal heat cycle system of heat supply, need not raise the temperature to heat transfer medium, has saved the consumption of the energy.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A medium-deep underground rock heat type heating system is characterized by comprising: at least one underground medium-deep rock-soil heat exchange system, an overground heat auxiliary system, a heat supply tail end heat circulation system and a control system;
the underground middle-deep rock-soil heat exchange system is used for enabling a heat exchange medium to exchange heat with underground middle-deep rock-soil;
the above-ground heat auxiliary system is connected to the underground medium-deep rock-soil heat exchange system, and comprises:
the heat exchange temperature raising pumping device is used for raising the temperature of the heat exchange medium when the temperature of the heat exchange medium subjected to heat exchange is lower than a first preset temperature, and conveying the heat exchange medium subjected to temperature raising to the heat supply tail end heat circulation system; and
the direct supply device is used for conveying the heat exchange medium to the heat supply tail end heat circulation system when the temperature of the heat exchange medium subjected to heat exchange is greater than or equal to the first preset temperature;
the heat supply end heat circulation system is connected to the overground heat auxiliary system to exchange heat of the heat exchange medium conveyed by the overground heat auxiliary system;
and the control system is used for controlling the overground heat auxiliary system according to the magnitude relation between the temperature of the heat exchange medium and the first preset temperature.
2. The medium-deep underground rock-heat type heating system according to claim 1, wherein the underground medium-deep rock-heat exchange system includes: the double-layer sleeve and the high-efficiency heat exchange terminal;
the double-layer sleeve comprises an inner layer sleeve and an outer layer sleeve, the lower end of the outer layer sleeve is connected to the efficient heat exchange terminal, and the heat exchange medium is injected from the inner layer sleeve, exchanges heat with underground medium-deep rock soil through the efficient heat exchange terminal and then is conveyed to the overground heat auxiliary system through the outer layer sleeve.
3. A medium depth underground rock heating type heating system according to claim 2, wherein the high efficiency heat exchange terminal includes: the high-strength alloy sleeve, the high-efficiency heat exchanger and the high-efficiency heat transfer medium;
the high-strength alloy sleeve is connected to the high-efficiency heat exchanger, and the high-efficiency heat transfer medium is filled in the high-strength alloy sleeve and the gap between the high-efficiency heat exchanger and the underground middle and deep rock soil so as to increase the heat exchange efficiency of the underground middle and deep rock soil and the heat exchange medium.
4. A medium-deep underground rock heat supply system according to claim 2, wherein an insulating layer is further provided on an outer side of an upper portion of the outer casing to prevent rapid loss of heat energy when the heat exchange medium passes through the ground surface through the outer casing.
5. The system of claim 2, further comprising a first tee having a first end connected to the upper end of the outer jacket, a second end connected to one end of the heat exchange and temperature raising pumping device, and a third end connected to the end heat cycle system; and
a first end of the second three-way pipe is connected to the upper end of the inner sleeve, a second end of the second three-way pipe is connected to one end of the heat exchange temperature raising pumping device, and a third end of the second three-way pipe is connected to the tail end heat circulation system;
the other end of the heat exchange and temperature raising pumping device is connected to the third end of the first three-way pipe through a first connecting pipe, and the other end of the heat exchange and temperature raising pumping device is connected to the third end of the second three-way pipe through a second connecting pipe.
6. A medium-depth underground rock heat type heating system according to claim 5, wherein the control system includes a first temperature control device, a first control valve, a second control valve, a third control valve, and a second temperature control device;
the first temperature control device is arranged at a first end of the first three-way pipe, the first control valve is arranged at a third end of the first three-way pipe, the second control valve is arranged at a second end of the second three-way pipe, the third control valve is arranged at a third end of the second three-way pipe, and the second temperature control device is arranged at the second connecting pipe;
the second temperature control device controls the heat exchange temperature raising pumping device to operate according to the temperature of the heat exchange medium in the second connecting pipe and a second preset temperature.
7. A medium-depth underground petrothermal heating system according to claim 5 wherein there are conduit pumps at the first end of the first tee, the first end of the second tee and the third end of the first tee to provide kinetic energy for the transfer of the heat exchange medium.
8. A medium-deep underground rock thermal heating system according to claim 1,
the heat exchange temperature raising pumping device comprises: an evaporator, a compressor, and a condenser.
9. A medium depth underground petrothermal heating method for a medium depth underground petrothermal heating system according to claim 1, the method comprising:
acquiring the current temperature of a heat exchange medium conveyed by an underground medium-deep rock-soil heat exchange system;
judging whether the current temperature is lower than a preset temperature or not to obtain a judgment result;
and controlling the heat exchange medium to be transmitted to a heat supply tail end heat circulation system through a heat exchange temperature raising pumping device or a direct supply device according to the judgment result.
10. The method for supplying heat to the heat supply end heat cycle system through the medium-depth underground rock according to the claim 9, wherein the step of controlling the heat exchange medium to be transferred to the heat supply end heat cycle system through the heat exchange temperature raising pumping device or the direct supply device according to the determination result comprises the following steps:
when the current temperature is lower than the preset temperature, the heat exchange medium is conveyed to the heat exchange temperature raising pumping device, so that after the heat exchange medium is raised in temperature by the heat exchange temperature raising pumping device, the heat exchange medium is conveyed to the heat supply tail end heat circulation system;
and when the current temperature is greater than or equal to the preset temperature, conveying the heat exchange medium to the direct supply device so as to convey the heat exchange medium to the heat supply tail end heat circulation system through the direct supply device.
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| CN201911027693.2A CN110631271A (en) | 2019-10-25 | 2019-10-25 | Medium-deep underground rock heat type heat supply system and heat supply method |
| PCT/CN2020/133206 WO2021078306A1 (en) | 2019-10-25 | 2020-12-02 | Mid-depth underground petrothermal heat supply system, and heat supplying method |
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| CN201911027693.2A CN110631271A (en) | 2019-10-25 | 2019-10-25 | Medium-deep underground rock heat type heat supply system and heat supply method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111380237A (en) * | 2020-03-27 | 2020-07-07 | 甘肃省建材科研设计院有限责任公司 | Heat exchange device for heat transfer medium and underground medium-deep rock soil |
| CN111594913A (en) * | 2020-05-29 | 2020-08-28 | 河南城建学院 | Clean heating system of middle-deep layer geothermal energy interference-free |
| CN112182849A (en) * | 2020-09-04 | 2021-01-05 | 中国核动力研究设计院 | Method and device for analyzing heat exchange after re-submerging criticality |
| WO2021078306A1 (en) * | 2019-10-25 | 2021-04-29 | 甘肃省建材科研设计院有限责任公司 | Mid-depth underground petrothermal heat supply system, and heat supplying method |
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| JP2001183030A (en) * | 1999-10-12 | 2001-07-06 | Kubota Corp | Geothermal sampling testing device |
| JP2005048972A (en) * | 2003-07-29 | 2005-02-24 | Nippon Steel Corp | Underground heat utilizing system |
| CN2679599Y (en) * | 2004-03-08 | 2005-02-16 | 徐生恒 | Air conditioning system using heat pump and utilizing ground as heat source |
| CN101581517B (en) * | 2009-06-16 | 2011-01-26 | 天津大学 | Heat pump system of single-loop geothermal underground heat exchanger |
| CN207299110U (en) * | 2017-05-26 | 2018-05-01 | 山东陆海石油技术股份有限公司 | Heat exchange heating system in mid-deep strata geothermal well |
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| CN109869935B (en) * | 2019-03-07 | 2024-02-02 | 河北工程大学 | Geothermal energy composite operation system |
| CN110631271A (en) * | 2019-10-25 | 2019-12-31 | 甘肃省建材科研设计院有限责任公司 | Medium-deep underground rock heat type heat supply system and heat supply method |
| CN210663425U (en) * | 2019-10-25 | 2020-06-02 | 甘肃省建材科研设计院有限责任公司 | Medium-deep underground rock heat type heating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021078306A1 (en) * | 2019-10-25 | 2021-04-29 | 甘肃省建材科研设计院有限责任公司 | Mid-depth underground petrothermal heat supply system, and heat supplying method |
| CN111380237A (en) * | 2020-03-27 | 2020-07-07 | 甘肃省建材科研设计院有限责任公司 | Heat exchange device for heat transfer medium and underground medium-deep rock soil |
| CN111594913A (en) * | 2020-05-29 | 2020-08-28 | 河南城建学院 | Clean heating system of middle-deep layer geothermal energy interference-free |
| CN111594913B (en) * | 2020-05-29 | 2021-09-14 | 河南城建学院 | Clean heating system of middle-deep layer geothermal energy interference-free |
| CN112182849A (en) * | 2020-09-04 | 2021-01-05 | 中国核动力研究设计院 | Method and device for analyzing heat exchange after re-submerging criticality |
| CN112182849B (en) * | 2020-09-04 | 2022-04-19 | 中国核动力研究设计院 | Method and device for analyzing heat exchange after re-submerging criticality |
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