WO2021078306A1 - Système d'alimentation en chaleur pétrothermique souterrain à mi-profondeur et procédé d'alimentation en chaleur - Google Patents

Système d'alimentation en chaleur pétrothermique souterrain à mi-profondeur et procédé d'alimentation en chaleur Download PDF

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WO2021078306A1
WO2021078306A1 PCT/CN2020/133206 CN2020133206W WO2021078306A1 WO 2021078306 A1 WO2021078306 A1 WO 2021078306A1 CN 2020133206 W CN2020133206 W CN 2020133206W WO 2021078306 A1 WO2021078306 A1 WO 2021078306A1
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Prior art keywords
heat exchange
heat
temperature
medium
exchange medium
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PCT/CN2020/133206
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English (en)
Chinese (zh)
Inventor
邵继新
司双龙
俞兆龙
李文斌
田斌守
梁斌
金先玉
沈明峰
刘翔
张苗
魏其斌
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甘肃省建材科研设计院有限责任公司
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Publication of WO2021078306A1 publication Critical patent/WO2021078306A1/fr

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T50/00—Geothermal systems 
    • 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
    • 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
    • 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

Definitions

  • the invention relates to the technical field of geothermal energy development, in particular to a medium-deep underground rock-heat heating system and a medium-deep underground rock-heat heating method.
  • Shallow geothermal energy is a depth range of 200m from the surface to the ground, and the temperature stored in water, soil, and rocks is below 25°C.
  • the use of heat pump technology can be used to extract geothermal energy utilization technology for heating or cooling of buildings.
  • the shallow geothermal energy utilization system is mainly divided into one is a water source heat pump heating system, and the other is a ground source heat pump heating system.
  • the former requires the extraction of groundwater, and has strict requirements on water temperature, water output, sediment content, same-layer recharge, and water pollution control, which have been restricted or even forbidden in many places; the latter requires heat to be balanced, but in the northern summer In areas with low cooling demand, the soil thermal compensation is seriously insufficient, making the heating effect of the ground source heat pump unsatisfactory.
  • Hot dry rock utilization technology that has emerged in recent years, "Geothermal Energy Terminology" (NB/T 10097-2018) 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°C.
  • Hot dry rock is mainly used for power generation internationally to distinguish the deep-seated hydrothermal geothermal technology used for heating. From the perspective of economic development and utilization, not all places have the conditions for hot dry rock mining. In terms of resource conditions and technical difficulty, the system does not have universal applicability.
  • the present invention proposes a medium-deep underground rock heating type heating system and heating method.
  • a medium-deep underground rock heating heating system including: at least one underground medium-deep rock-soil heat exchange system, an above-ground heat auxiliary system, and a heating terminal heat circulation system And control system;
  • the underground mid-deep rock-soil heat exchange system is used to make the heat exchange medium exchange heat with the underground mid-deep rock and soil;
  • the above-ground thermal auxiliary system is connected to the underground mid-deep rock-soil heat exchange system, which includes:
  • the heat exchange temperature raising pumping device is used to raise the temperature of the heat exchange medium when the temperature of the heat exchange medium after the heat exchange is lower than the first preset temperature, and to increase the temperature of the heat exchange medium.
  • the heat exchange medium is transported to the heat circulation system of the heating terminal;
  • a direct supply device configured to transport the heat exchange medium to the heat supply terminal heat circulation system when the temperature of the heat exchange medium after the heat exchange is greater than or equal to the first preset temperature
  • the heat supply terminal heat circulation system is connected to the above-ground thermal auxiliary system to exchange heat with the heat exchange medium delivered by the above-ground thermal auxiliary system;
  • the control system is used for controlling the above-ground thermal auxiliary system according to the magnitude relationship between the temperature of the heat exchange medium and the first preset temperature.
  • the underground mid-deep rock-soil heat exchange system includes: double-layer casing and high-efficiency heat exchange terminals;
  • the double-layer sleeve includes an inner sleeve and an outer sleeve, the lower end of the outer sleeve is connected to the high-efficiency heat exchange terminal, and the heat exchange medium is injected by the inner sleeve, After the high-efficiency heat exchange terminal exchanges heat with the underground middle and deep rock and soil, it is transported to the above-ground thermal auxiliary system by the outer casing.
  • the high-efficiency heat exchange terminal includes: a high-strength alloy sleeve, a high-efficiency heat exchanger and a 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 between the high-strength alloy sleeve and the high-efficiency heat exchanger and the underground medium and deep rock soil To increase the heat exchange efficiency between the deep underground rock and soil and the heat exchange medium.
  • a thermal insulation layer is further provided on the outer side of the upper part of the outer sleeve to prevent rapid loss of heat energy when the heat exchange medium flows through the surface of the outer sleeve.
  • the medium-deep underground rock heating heating system further includes: a first three-way pipe, the first end of which is connected to the upper end of the outer casing, and the second end is connected to the heat exchange and temperature raising pumping device One end and the third end are connected to the end thermal cycle system; and
  • a second three-way pipe the first end of which is connected to the upper end of the inner sleeve, the second end of which is connected to the one end of the heat exchange and temperature raising pumping device, and the third end of which is connected to the end thermal circulation system ;
  • the other end of the heat exchange and temperature raising pumping device is connected to the third end of the first tee through a first connecting pipe, and the other end is connected to the second tee through a second connecting pipe The third end of the tube.
  • 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 the first end of the first three-way pipe, the first control valve is arranged at the third end of the first three-way pipe, and the second control valve is arranged at the third end of the first three-way pipe.
  • the valve is arranged at the second end of the second three-way pipe, the third control valve is arranged at the 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 operation of the heat exchange temperature raising pumping device according to the temperature of the heat exchange medium in the second connecting pipe and a second preset temperature.
  • a pipeline pump is provided 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 for the heat exchange medium
  • the transportation provides kinetic energy.
  • the heat exchange and temperature raising pumping device includes: an evaporator, a compressor, and a condenser.
  • a medium-deep underground rock-heat heating method for use in the medium-deep underground rock-heat heating system of any one of the above.
  • the method includes: obtaining underground medium-deep rock and soil heat The current temperature of the heat exchange medium delivered by the exchange system;
  • the heat exchange medium is controlled to be transferred to the heat circulation system of the heating terminal through a heat exchange temperature raising pumping device or a direct supply device.
  • the step of controlling the transfer of the heat exchange medium to the heat circulation system of the heating terminal through a heat exchange temperature raising pumping device or a direct supply device according to the determination result includes:
  • the heat exchange medium When the current temperature is less than the preset temperature, the heat exchange medium is delivered to the heat exchange and temperature raising pumping device to raise the temperature of the heat exchange medium through the heat exchange and temperature raising pumping device After that, the heat exchange medium is transported to the heat-supply terminal thermal cycle system;
  • the heat exchange medium is delivered to the direct supply device, so that the heat exchange medium is delivered to the heat supply terminal through the direct supply device. Circulatory system.
  • a medium-deep underground rock heating heating system and heating method of the present invention can achieve considerable technological advancement and practicability, and has a wide range of industrial use value. It has at least the following advantages:
  • Fig. 1 shows a schematic block diagram of a medium-deep underground rock heating heating system according to an embodiment of the present invention
  • Fig. 2 shows a schematic flow diagram of a medium-deep underground rock heating type heating method according to an embodiment of the present invention.
  • the embodiment of the present invention provides a medium-deep underground rock heating heating system, as shown in FIG. 1, including: at least one underground medium-deep rock-soil heat exchange system 1, an above-ground heat auxiliary system 2, a heating terminal heat circulation system 3 and control system 4.
  • the underground middle-deep rock-soil heat exchange system 1 can be one (as shown in Figure 1). According to the actual needs of the heating terminal thermal cycle system 3, it can also be multiple underground middle-deep rock-soil heat exchange systems 1 in series and parallel. It is connected to the ground thermal auxiliary system 2 to ensure that it can provide sufficient heat energy.
  • the underground medium and deep layer of rock and soil heat exchange system 1 is installed in the well.
  • the well diameter is 150-300 mm
  • the well depth is 600-3000 meters.
  • the underground middle-deep rock-soil heat exchange system 1 may include a double-layer casing 11 and a high-efficiency heat exchange terminal 12, wherein the high-efficiency heat exchange terminal 12 is connected to the outer casing 111 of the double-layer casing 11
  • the heat exchange medium is injected into the upper end of the inner sleeve 112, flows through the lower end of the inner sleeve 112, and exchanges heat with the underground medium and deep soil 10 through the high-efficiency heat exchange terminal 12 to complete the heat exchange. Lead out through the outer sleeve 111.
  • the high-efficiency heat exchange terminal 12 includes a high-strength alloy sleeve 121, a high-efficiency heat exchanger 122, and a high-efficiency heat transfer medium 123 that are coupled together.
  • the high-strength alloy sleeve 121 can effectively protect the high-efficiency heat exchanger 122 from being damaged, so as to ensure the stability of the underground mid-deep rock-soil heat exchange system 1.
  • the high-efficiency heat exchanger 122 is made of high-strength nickel steel alloy material, which can effectively improve the heat exchange efficiency of the high-efficiency heat exchange terminal 12 while ensuring its mechanical strength.
  • the high-efficiency heat exchanger 122 can also be made of other materials, which is not limited here.
  • the gap between the deep underground rock and soil 10 and the high-strength alloy casing 121 and the high-efficiency heat exchanger 122 is filled with a high-efficiency heat transfer medium 123.
  • the high-efficiency heat transfer medium 123 is mixed and stirred by cement, coagulant, fluid loss agent, dispersant, granulated blast furnace slag and other materials, and is densely filled in the high-strength alloy casing 121, In the gap between the high-efficiency heat exchange terminal 12 and the medium-deep rock soil 10.
  • the thermal insulation layer 13 can be sprayed nano thermal insulation materials, polyurethane foam thermal insulation pipes, and the outer layer is poured into polymer thermal insulation mortar.
  • the heat exchange medium may be water, of course, it may also be other materials with faster heat transfer.
  • the above-ground heat auxiliary system 2 includes a heat exchange and temperature raising pumping device 21 that raises the temperature of the heat exchange medium after the heat exchange through the underground middle-deep rock-soil heat exchange system 1, and performs heat exchange.
  • the latter heat exchange medium is directly transported to the direct supply device 22 of the heat circulation system 3 of the heating terminal.
  • the heat exchange system 1 of the underground middle-deep rock soil 10 and the heat supply terminal heat circulation system 3 are organically connected.
  • the first end 51 of the first three-way pipe 5 is connected to the upper end of the outer sleeve 111, the second end 52 is connected to one end of the heat exchange and temperature raising pumping device 21, and the third end 53 is connected to the heating end.
  • Thermal circulation system 3; the first end 61 of the second three-way pipe 6 is connected to the upper end of the inner sleeve 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 supply Hot end thermal cycle system 3.
  • both ends of the first connecting pipe 7 are respectively connected to the other end of the heat exchange and 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 heat exchange and temperature raising pumping device.
  • the other end of the device 21 is connected to the third end 63 of the second tee 6.
  • the heat exchange medium is water
  • the first three-way pipe 5 and the first connecting pipe 7 are hot water pipes
  • the second three-way pipe 6 and the second connecting pipe 8 are cold water pipes.
  • the third end 53 of the first three-way pipe 5 and the third end 63 of the second three-way pipe 6 form a direct supply system 22.
  • the control system 4 includes a first temperature control disposed at the second end 52 of the first three-way pipe 5.
  • the second control valve 43 of 62 and the third control valve 44 provided at the third end 63 of the second three-way pipe 6.
  • the first temperature control device 41 detects that the temperature of the heat exchange medium (for example, hot water) conveyed by the outer sleeve 111 is lower than the first preset temperature (ie, lower than the required temperature), Then the first control valve 42 and the third control valve 44 are controlled to close, the second control valve 43 is opened, and the heat exchange medium is transported to the heat exchange and temperature raising pumping device 21 through the second end 52 of the first three-way pipe 5, The temperature of the heat exchange medium that has not reached the temperature requirement is raised, and the raised heat exchange medium is transported to the heating terminal heat circulation system 3 through the first connecting pipe 7 and the third end 53 of the first three-way pipe 5 .
  • the first preset temperature ie, lower than the required temperature
  • the heat exchange medium for example, cold water
  • the heat exchange medium for example, cold water
  • the heat exchange and temperature raising pumping device through the third end 62 of the second three-way pipe 6 and the second connecting pipe 8 21, the second end 62 and the first end 61 of the second three-way pipe 6 are then transported to the inner sleeve 112 to realize the circulation of the heat exchange medium.
  • 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 the second preset temperature, it indicates that the heating end thermal cycle system 3 has a greater demand for heat energy.
  • the heat exchange medium at the current temperature cannot meet its demand, control the operation of the heat exchange temperature raising pumping device 21 to increase the temperature of the heat exchange medium; when the second temperature control device 45 detects the heat exchange medium in the second connecting pipe 8
  • the temperature of (for example, cold water) is greater than or equal to the second preset temperature
  • the heat exchange and temperature raising pumping device 21 is controlled to shut down to operate at the end of the heating end.
  • the thermal cycle system 3 has a small demand for thermal energy, the loss of the heat exchange and temperature raising pumping device 21 can be reduced, thereby achieving the purpose of saving energy.
  • the heat exchange temperature raising pumping device 21 includes an evaporator 211, a compressor 212, and a condenser 213. Specifically, the heat exchange medium enters the evaporator through the second end 52 of the first three-way pipe 5 211. After the compressor 212 is compressed to increase the temperature, the heat exchange medium is raised through the condenser 213 to meet the requirements of the heat circulation system 3 at the heating terminal.
  • the first temperature control device 41 detects that the temperature of the heat exchange medium (for example, hot water) conveyed by the outer sleeve 111 is greater than or equal to the first preset temperature (ie, meets the required temperature)
  • the first control valve 42 and the third control valve 44 are controlled to open, and the second control valve 43 is closed, so as to directly transport the heat exchange medium conveyed by the outer sleeve 111 through the third end 53 of the first three-way pipe 5 To the heat circulation system 3 at the heating end.
  • the heat exchange medium for example, cold water
  • the heat exchange medium for example, cold water
  • the sleeve 112 is used to realize the circulation of the heat exchange medium.
  • the first temperature control device 41 and the second temperature control device 45 may be PLC temperature controllers, so as to realize the control of the control valve and the heat exchange temperature raising pumping device 21 according to the difference in temperature.
  • the heating terminal thermal cycle system 3 includes a heating pipe network 31 and a terminal heat dissipation device 32.
  • the terminal heat dissipation device 32 may be an indoor radiator, a floor heating tube plate, or a fan tube plate.
  • the first end 51 of the first three-way pipe 5, the first end 61 of the second three-way pipe 6 and the first The third end 53 of the three-way pipe 5 is provided with a pipeline pump 9 to ensure the kinetic energy of the heat exchange medium to circulate.
  • a pipeline pump 9 can also be provided, which is not limited to this.
  • the embodiment of the present invention also provides a medium-deep underground rock heating type heating method, which is used in any one of the above-mentioned medium-deep underground rock heating heating systems, as shown in FIG. 2, the heating method include:
  • Step S10 acquiring the current temperature of the heat exchange medium transported by the underground middle-deep rock-soil heat exchange system.
  • the temperature requirements of the heat exchange medium in the heat circulation systems at the heating end are different. Therefore, when the heat exchange medium passes through the underground middle-deep rock-soil heat exchange system and the underground After the deep rock and soil undergoes heat exchange, the current temperature of the heat exchange medium needs to be detected, and the corresponding above-ground heat auxiliary system has been selected according to different current temperatures.
  • step S20 it is judged whether the current temperature is less than a preset temperature, so as to obtain a judgment result.
  • the current temperature of the heat exchange medium when the current temperature of the heat exchange medium is obtained, the current temperature needs to be compared with the preset temperature (ie, the first preset temperature), and different above-ground heat assist systems have been controlled to deliver according to different comparison results.
  • the heat exchange medium is transferred to the heat circulation system at the heating end.
  • the preset temperature is the temperature of the heat exchange medium required by the heating terminal thermal cycle system. Different heating terminal thermal cycle systems have different temperature requirements for the heat exchange medium. Therefore, the preset temperature can be carried out according to actual needs. set up.
  • step S30 according to the determination result, the heat exchange medium is controlled to be transferred to the heat circulation system of the heating terminal through the heat exchange temperature raising pumping device or the direct supply device.
  • the heat exchange medium needs to be raised. Furthermore, the heat exchange medium needs to be transported to the heat exchange and temperature raising pumping device, so that the heat exchange medium is raised by the heat exchange and temperature raising pumping device, and then sent to the heat circulation system at the heating end.
  • the current temperature of the heat exchange medium When the current temperature of the heat exchange medium is greater than or equal to the preset temperature, it indicates that the temperature of the heat exchange medium meets the temperature required by the heat circulation system at the heating end, so it is only necessary to transport the heat exchange medium to the heating end through the direct supply device The thermal cycle system is sufficient.
  • the medium-deep underground rock heating heating system and heating method of the above-mentioned embodiments use the underground medium-deep rock-soil heat exchange system to directly exchange heat with the medium-deep rock and soil, without extracting groundwater, and has no impact on the environment. Interference, and the heat source continues to be stable, the investment is economical, the use environment is small, and it is easy to promote.
  • the heat exchange temperature raising pumping device and the direct supply device Through the arrangement of the heat exchange temperature raising pumping device and the direct supply device, the heat exchange medium can still be raised by the heat exchange temperature raising pumping device to ensure the heat at the end of the heat supply when the heat in the middle and deep rock soil is insufficient.
  • the circulation system requires heat energy. When the middle and deep layers of rock and soil have sufficient heat, the heat exchange medium can be directly transported to the heating end heat circulation system through the direct supply system. There is no need to raise the temperature of the heat exchange medium, which saves energy. Consumption.

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Abstract

La présente invention concerne un système d'alimentation en chaleur pétrothermique souterrain à mi-profondeur, comprenant : au moins un système d'échange de chaleur des roches et du sous-sol à mi-profondeur souterrain (1), un système thermique auxiliaire en surface (2), un système de circulation thermique d'extrémité d'alimentation en chaleur (3) et un système de commande (4). Lorsque la température d'un milieu d'échange de chaleur qui effectue un échange de chaleur dans le système d'échange de chaleur des roches et du sous-sol à mi-profondeur souterrain (1) atteint une température prédéfinie, le milieu d'échange de chaleur est transmis au système de circulation thermique d'extrémité d'alimentation en chaleur (3) au moyen d'un appareil d'alimentation directe du système thermique auxiliaire en surface (2). Lorsque le milieu d'échange de chaleur n'atteint pas la température prédéfinie, le milieu d'échange de chaleur est chauffé au moyen d'un appareil de pompe à chaleur à échange de chaleur (21) du système thermique auxiliaire en surface (2), et transmis au système de circulation thermique d'extrémité d'alimentation en chaleur (3). La présente invention résout le problème dans les pompes à chaleur aquathermiques existantes de pollution environnementale de l'eau et d'insuffisance de la stabilité de source de chaleur, et empêche efficacement la pollution des ressources d'eau et peut fournir une source de chaleur stable en continu.
PCT/CN2020/133206 2019-10-25 2020-12-02 Système d'alimentation en chaleur pétrothermique souterrain à mi-profondeur et procédé d'alimentation en chaleur WO2021078306A1 (fr)

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CN201911027693.2A CN110631271A (zh) 2019-10-25 2019-10-25 中深层地下岩热型供热系统及供热方法
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CN110631271A (zh) * 2019-10-25 2019-12-31 甘肃省建材科研设计院有限责任公司 中深层地下岩热型供热系统及供热方法
CN111380237A (zh) * 2020-03-27 2020-07-07 甘肃省建材科研设计院有限责任公司 传热介质和地下中深层岩土热交换装置
CN111594913B (zh) * 2020-05-29 2021-09-14 河南城建学院 中深层地热能无干扰清洁供热系统
CN112182849B (zh) * 2020-09-04 2022-04-19 中国核动力研究设计院 再淹没临界后换热分析方法及装置

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CN110631271A (zh) * 2019-10-25 2019-12-31 甘肃省建材科研设计院有限责任公司 中深层地下岩热型供热系统及供热方法
CN210663425U (zh) * 2019-10-25 2020-06-02 甘肃省建材科研设计院有限责任公司 中深层地下岩热型供热系统

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