CN113027713A - Combined geothermal development and utilization system and energy distribution and management method - Google Patents
Combined geothermal development and utilization system and energy distribution and management method Download PDFInfo
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- CN113027713A CN113027713A CN202110320696.6A CN202110320696A CN113027713A CN 113027713 A CN113027713 A CN 113027713A CN 202110320696 A CN202110320696 A CN 202110320696A CN 113027713 A CN113027713 A CN 113027713A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/40—Geothermal collectors operated without external energy sources, e.g. using thermosiphonic circulation or heat pipes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a combined geothermal development and utilization system and an energy distribution pipe control method, wherein the system comprises a heat pipe, the heat pipe is arranged in a production well, a gap is reserved between the outer wall of the heat pipe and the inner wall of the production well, and a heat storage working medium flows in the gap for heat exchange; the heat pipe is internally provided with a working medium in the pipe, the working medium outlet end of the heat pipe is connected with the working medium inlet end of the primary heat utilization device, and the working medium outlet end of the primary heat utilization device is connected with the working medium outlet end of the heat pipe, so that the working medium in the pipe circularly flows between the heat pipe and the primary heat utilization device; the inlet end of the injection pump is communicated with the gap, the outlet end of the injection pump is communicated with the injection well, so that the heat storage working medium enters the artificial heat storage through the injection well under the action of the injection pump, seeps in the artificial heat storage fracture and obtains heat and flows into the production well, and the circular flow of the heat storage working medium is formed. The system directly generates steam required by the primary heat utilization device through the heat pipe, and is favorable for long-term stable operation of the primary heat utilization device.
Description
Technical Field
The invention belongs to the field of geothermal energy development and utilization, and particularly relates to a combined geothermal energy development and utilization system and an energy distribution pipe control method.
Background
The geothermal energy of the dry hot rock is the geothermal energy stored in the deep low-permeability high-temperature rock mass, and has the advantages of rich reserves, high temperature and the like. The existing geothermal exploitation technology of the dry hot rock mainly adopts an Enhanced (EGS) geothermal system, and the principle is that a well is drilled in a dry hot rock target area, underground low-permeability target rock mass is fractured into high-permeability artificial heat storage by means of hydraulic fracturing and the like, the development degree of the artificial heat storage is evaluated by means of microseismic monitoring and the like, and then one or more wells are drilled to realize inter-well communication. The system is a system for ground power generation by injecting low-temperature fluid media such as water and carbon dioxide into artificial heat storage through equipment such as a water pump and replacing heat energy in high-temperature rocks. Since the concept of enhanced geothermal exploitation was proposed in the united states in the last 70 th century, the mode has not yet completely formed commercial operation, and is not only limited by factors such as high drilling and artificial fracturing cost, difficulty in ensuring communication between wells, leakage and loss of circulating working medium and the like, but also has the problems of production well scaling caused by separation of extracted fluid minerals, complex ground heat exchange system, remarkable influence of extracted fluid flow and temperature on power generation stability and the like.
The heat pipe can rapidly transmit heat from the high-temperature section to the low-temperature section by utilizing the phase change of working media in the pipe. The heat pipe has the characteristics of high heat transfer rate, excellent isothermal property and the like, and is one of the most effective heat transfer devices at present. Patents ZL201710343194.9 and ZL201910328413.5 disclose super-long gravity assisted heat pipes that can carry out deep geothermal exploitation, have broken through bottlenecks such as hydrops, gas-liquid roll-up, but because the underground rock mass of low heat conduction outside of tubes, the great degree of low heat conductivity of the rock mass outside of tubes has restricted this heat pipe and has adopted hot system performance.
Disclosure of Invention
In order to solve at least one technical problem of the background art, embodiments of the present invention provide a combined geothermal development and utilization system and an energy distribution management method.
In order to achieve the purpose, the technical scheme of the invention is as follows:
in a first aspect, an embodiment of the present invention provides a system for combined geothermal development and utilization, including:
the heat pipe is used for being placed in the production well, a gap is reserved between the outer wall of the heat pipe and the inner wall of the production well, and the heat storage working medium flows in the gap for heat exchange; the heat pipe is internally provided with a working medium in the pipe, the working medium outlet end of the heat pipe is connected with the working medium inlet end of the primary heat utilization device, and the working medium outlet end of the primary heat utilization device is connected with the working medium outlet end of the heat pipe, so that the working medium in the pipe circularly flows between the heat pipe and the primary heat utilization device;
and the inlet end of the injection pump is communicated with the gap, the outlet end of the injection pump is communicated with the injection well, so that the heat storage working medium enters the artificial heat storage through the injection well under the action of the injection pump, seeps in the artificial heat storage fracture and obtains heat and flows into the production well, and the circular flow of the heat storage working medium is formed.
Preferably, the combined geothermal development and utilization system is characterized in that a steam regulating valve and a gas-liquid separator are connected and installed between the working medium outlet end of the heat pipe and the working medium inlet end of the primary heat utilization device, and a reflux regulating valve is connected and installed between the working medium outlet end of the primary heat utilization device and the working medium inlet end of the heat pipe.
As a preferable preference of the above combined geothermal exploitation and utilization system, the primary heat utilization device is a ground power generation device including a steam turbine, a generator, and a condenser; the heat pipe is used as an evaporator of the ground power generation device, the ground power generation device is equivalent to a condensation section of the heat pipe, working medium in the heat pipe is vaporized after heat is obtained and is conveyed to the gas-liquid separator through the steam regulating valve, vapor phase fluid separated by the gas-liquid separator enters the steam turbine to do work to drive the generator to generate power, the vapor phase fluid enters the steam condenser to further release heat and liquefy after the work is done and enters the working medium recycling storage device, and liquid working medium in the pipe enters the heat pipe through the backflow regulating valve to form closed circulation.
Preferably, the steam condenser is further connected to a direct heat supply system.
As the optimization of the combined geothermal development and utilization system, the steam condenser is used for adjusting the back pressure of the steam turbine, and the regulation of the power generation power and the energy distribution of different gradient utilization of the heat storage working medium are realized by controlling the steam pressure, the circulation flow, the working temperature and the back pressure control of the steam turbine.
Preferably, the injection pump is connected with the heat pump and the waste heat gradient utilization system through a pipeline, and the pipeline is communicated with the gap.
Preferably, the system for combined geothermal development and utilization as described above, the production well is one well, or a plurality of wells.
As a preferable preference of the above-described system for combined geothermal development and utilization, the heat pipe is designed as an equal diameter pipe and inserted into the first open hole section of the production well, or is designed as a stepped diameter and inserted into the first open hole section and the second open hole section of the production well; the outer wall of the gravity heat pipe is a smooth wall surface or a reinforced heat exchange element is added.
Preferably, the combined geothermal development and utilization system comprises a heat storage medium comprising water and/or carbon dioxide; the working medium in the tube comprises one or more of water, liquid ammonia, pentane, alcohol, R134a and R410 a.
In a second aspect, an embodiment of the present invention provides an energy distribution management method for a combined geothermal development and utilization system, where the system is the above system, and the method includes:
calculating the steam internal energy required by the heat pipe according to the power generation requirement and efficiency;
adjusting the opening of a steam adjusting valve, controlling the outlet temperature of the steam condenser to enable the working temperature of the heat pipe to be gradually matched with the power generation requirement, and simultaneously providing heat for the direct heat supply system by the external circulation of the steam condenser;
the injection pump is adjusted to control the flow of the heat storage working medium, the heat exchanger is adjusted to control the injection temperature of the heat storage working medium, and heat is transferred to the waste heat cascade utilization system.
Compared with the prior art, the invention has the beneficial effects that:
the system directly generates steam required by the primary heat utilization device through the heat pipe, the circulating working medium in the heat pipe has no scaling and corrosion effects, the long-term stable operation of the primary heat utilization device is facilitated, the forced convection heat transfer is realized by the heat storage working medium in the production well at the evaporation section of the heat pipe, the external energy acquisition performance of the ultra-long heat pipe is greatly improved, the efficient evaporation of the fluid working medium in the ultra-long heat pipe is realized, and the stable and reliable thermodynamic cycle is further realized.
Drawings
FIG. 1 is a schematic diagram of a combined geothermal development and utilization system incorporating an enhanced geothermal system and gravity heat pipes as used in an embodiment;
description of reference numerals: 1. an injection well; 2. manual heat storage; 3. a heat storage working medium; 4. a second well opening section of the production well; 5. a heat pipe; 6. working medium in the pipe; 7. a well opening section of the production well; 8. a direct heating system; 9. a steam condenser; 10. a generator; 11. a steam turbine; 12. a gas-liquid separator; 13. a steam regulating valve; 14. a ground return and descaling pipe; 15. a heat exchanger; 16. a heat pump and a waste heat cascade utilization system; 17. an injection pump; 18. a working medium recovery storage device; 19. and a reflux regulating valve.
Detailed Description
Example (b):
in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1, the system for combined geothermal development and utilization provided by the embodiment includes a heat pipe 5, the heat pipe 5 is used for being placed in a production well, a gap is reserved between the outer wall of the heat pipe 5 and the inner wall of the production well, and a heat storage working medium 3 flows in the gap for heat exchange; a working medium 6 in the heat pipe 5 is arranged in the heat pipe 5, the working medium outlet end of the heat pipe 5 is connected with the working medium inlet end of the primary heat utilization device, and the working medium outlet end of the primary heat utilization device is connected with the working medium outlet end of the heat pipe 5, so that the working medium 6 in the pipe circularly flows between the heat pipe 5 and the primary heat utilization device; the heat storage device further comprises an injection pump 17, the inlet end of the injection pump 17 is communicated with the gap, the outlet end of the injection pump 17 is communicated with the injection well 1, so that the heat storage working medium 3 enters the artificial heat storage 2 through the injection well 1 under the action of the injection pump 17, seepage flows in the crack of the artificial heat storage 2, heat is obtained, the heat flows into the production well, and circulation flow of the heat storage working medium 3 is formed.
Therefore, the system directly generates steam required by the primary heat utilization device through the heat pipe, the circulating working medium in the heat pipe has no scaling and corrosion effects, the long-term stable operation of the primary heat utilization device is facilitated, the forced convection heat transfer is realized by the heat storage working medium in the production well at the evaporation section of the heat pipe, the external energy acquisition performance of the ultra-long heat pipe is greatly improved, the efficient evaporation of the fluid working medium in the ultra-long heat pipe is realized, and the stable and reliable thermodynamic cycle is further realized.
As a preferable example of the above-described system for combined geothermal development and utilization, a steam regulating valve 13 and a gas-liquid separator 12 are installed in series between the working medium outlet end of the heat pipe 5 and the working medium inlet end of the primary heat utilization device, and a return regulating valve 19 is installed in series between the working medium outlet end of the primary heat utilization device and the working medium inlet end of the heat pipe 5. The steam regulating valve 13, the gas-liquid separator 12 and the backflow regulating valve 19 are used for regulating the steam pressure, the circulation flow and the working temperature of the ultra-long heat pipe 5.
Specifically, in this embodiment, the primary heat utilization device is a ground power generation device, and includes a steam turbine 11, a generator 10, and a steam condenser 9; the heat pipe 5 is used as an evaporator of a ground power generation device, the ground power generation device is equivalent to a condensation section of the heat pipe, working medium 6 in the heat pipe 5 is vaporized after heat is obtained and is conveyed to the gas-liquid separator 12 through the steam regulating valve 13, vapor phase fluid separated by the gas-liquid separator 12 enters the steam turbine 11 to do work to drive the generator 10 to generate power, the vapor phase fluid enters the steam condenser 9 to further release heat and liquefy after the work is done and enters the working medium recycling storage 18, and the liquid working medium 6 in the heat pipe enters the heat pipe 5 through the backflow regulating valve 19 to form closed circulation. In addition, the steam condenser 9 is also connected with the direct heating system 8, the steam condenser 9 is used for adjusting the back pressure of the steam turbine 11, and the power generation power adjustment and the energy distribution of different gradient utilization of the heat storage working medium are realized by controlling the steam pressure, the circulation flow, the working temperature and the back pressure control of the steam turbine 11.
Preferably, a heat exchanger 15 is connected to a pipeline connecting the inlet end of the injection pump 17 and the gap, and the heat exchanger 15 is further connected to a heat pump and waste heat cascade utilization system 16 to further utilize heat.
In particular, the production well is a single well, or a plurality of wells. The heat pipe 5 can be designed into a pipe with equal diameter and inserted into a first well-opening section 7 of the production well, or designed into a stepped diameter and inserted into the first well-opening section and a second well-opening section of the production well; the outer wall of the heat pipe 5 is a smooth wall surface or is additionally provided with reinforced heat exchange elements such as fins and the like. The heat storage working medium 3 includes but is not limited to water and carbon dioxide, and the working medium 6 in the heat pipe includes but is not limited to water, liquid ammonia, pentane, alcohol, R134a, R410 a.
That is, fig. 1 shows an enhanced geothermal system combined with gravity heat pipes for combined geothermal exploitation and utilization, which is used for exploiting deep geothermal heat and performing power generation, heat supply and cascade utilization. The system comprises an enhanced geothermal circulating system, an ultra-long heat pipe system, a ground power generation device and a secondary heat utilization system. The system combines the advantages of an enhanced geothermal system and an ultra-long heat pipe heat collection system, and forms heat storage circulation and ultra-long heat pipe circulation by inserting the evaporation section of the ultra-long heat pipe into the production well of the enhanced geothermal system. The heat storage circulation continuously provides heat for the evaporation section of the ultra-long heat pipe, and secondary heat utilization is carried out through a ground heat exchanger, a heat pump and the like. The super-long heat pipe can directly convey steam to a ground power generation system, and the power generation power adjustment and the energy distribution of different gradient utilization of the heat storage circulating working medium can be realized by controlling the steam pressure, the circulating flow, the working temperature and the back pressure of the steam turbine.
The secondary heat utilization system includes, but is not limited to, an organic rankine cycle power generation system, a heat pump system, and a direct heating system. The heat storage working medium extracted by the enhanced geothermal system production well is transferred to a secondary heat utilization system after exchanging heat with the heat pipe, and further an organic Rankine cycle and a heat pump system are adopted for power generation and heat utilization according to the grade of the heat storage cycle working medium. The enhanced geothermal system comprises not only a dry hot rock type geothermal resource exploitation system, but also a hydrothermal type geothermal resource exploitation system with similar technical scheme, such as a water intake recharge system.
The enhanced geothermal circulating system comprises an injection well 1, an artificial heat storage 2, a heat storage working medium 3, a first production well open section 7, a second production well open section 4, a ground backflow and descaling pipe 14 and an injection pump 17, wherein an ultra-long heat pipe system comprises a heat pipe 5, a working medium 6 in the pipe, a gas-liquid separator 12, a steam regulating valve 13, a working medium recovery storage 18 and a backflow regulating valve 19, a ground power generation device comprises a steam turbine 11, a generator 10 and a condenser 9, and a secondary heat utilization system comprises a direct heat supply system 8, a heat exchanger 15 and a heat pump and waste heat gradient utilization system 16.
Wherein, an injection well 1, an artificial heat storage 2, a first well-opening section 7 of a production well, a second well-opening section 4 of the production well, a ground backflow and descaling pipe 14, a heat exchanger 15 and an injection pump 17 are connected in sequence to form a heat storage circulation loop; the heat pipe 5 is sequentially connected with a steam regulating valve 13, a gas-liquid separator 12, a steam turbine 11, a generator 10, a condensing engine 9, a working medium recycling storage 18 and a backflow regulating valve 19 and is connected into the heat pipe 5 again to form a closed loop, and the evaporation section part of the heat pipe 5 is inserted into the first open-hole section 7 of the production well of the enhanced geothermal circulating system to form a gap with the wall surface of the first open-hole section 7 of the production well.
When the system is operated, the heat storage working medium 3 enters the artificial heat storage 2 through the injection well 1 under the action of the injection pump 17, seeps in the fracture of the artificial heat storage 2 to obtain heat, is produced by the second well-opening section 4 of the production well and flows upwards to the first well-opening section 7 of the production well; the heat storage working medium 3 transfers heat to the heat pipe 5 when flowing through a gap between an evaporation section of the heat pipe 5 and a well opening section 7 of the production well, the working medium 6 in the pipe is vaporized and ascended after obtaining the heat, the working medium is conveyed to a gas-liquid separator 12 through a steam regulating valve 13, liquid phase is separated by the gas-liquid separator 12 and then enters a steam turbine 11 to do work, a generator 10 is driven to generate electricity, the working medium enters a condenser 9 to further release heat and be liquefied and enters a working medium recovery storage device 18, and the liquid-state pipe internal circulation working medium 6 enters the heat pipe 5 through a backflow regulating valve 19 and gradually obtains the heat and is vaporized again when.
Correspondingly, the embodiment also provides an energy distribution and management method based on the combined geothermal exploitation and utilization system, which specifically comprises the following steps:
1) calculating the steam internal energy required by the ultra-long heat pipe according to the power generation requirement and efficiency;
2) the opening degree of a steam regulating valve 13 is regulated, the outlet temperature of the steam condenser 9 is controlled, the working temperature of the ultra-long heat pipe is gradually matched with the power generation requirement, and meanwhile, the heat is provided for the direct heating system 8 through the external circulation of the steam condenser 9;
3) the injection pump 17 is adjusted to control the heat storage circulation flow, the heat exchanger 15 is adjusted to control the injection temperature of the heat storage circulation, and heat is transferred to the heat pump and the waste heat cascade utilization system 16.
In summary, compared with the prior art, the invention has the following technical advantages:
(1) the invention can directly generate steam for power generation through the ultra-long heat pipe system without equipment such as a ground flash evaporation system, a heat exchanger and the like, thereby simplifying the ground power generation system, and the circulating working medium in the pipe has no scaling and corrosion effects and is beneficial to the long-term stable operation of the steam turbine.
(2) By means of the isothermal characteristic of the ultra-long heat pipe, the temperature of the heat storage circulating working medium in the production well is more uniform and stable in the rising process, the problem of separation of components such as carbonate is reduced, and scaling of the production well is avoided. In addition, the temperature can be adjusted according to the evaporation and condensation temperature of the ultra-long heat pipe, and energy distribution between power generation and waste heat gradient utilization is realized.
(3) The evaporation section of the ultra-long heat pipe realizes forced convection heat transfer by a heat storage circulating working medium in the production well, and the external energy acquisition performance of the ultra-long heat pipe is greatly improved.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. A combined geothermal development and utilization system, comprising:
the heat pipe is used for being placed in the production well, a gap is reserved between the outer wall of the heat pipe and the inner wall of the production well, and the heat storage working medium flows in the gap for heat exchange; the heat pipe is internally provided with a working medium in the pipe, the working medium outlet end of the heat pipe is connected with the working medium inlet end of the primary heat utilization device, and the working medium outlet end of the primary heat utilization device is connected with the working medium outlet end of the heat pipe, so that the working medium in the pipe circularly flows between the heat pipe and the primary heat utilization device;
and the inlet end of the injection pump is communicated with the gap, the outlet end of the injection pump is communicated with the injection well, so that the heat storage working medium enters the artificial heat storage through the injection well under the action of the injection pump, seeps in the artificial heat storage fracture and obtains heat and flows into the production well, and the circular flow of the heat storage working medium is formed.
2. The combined geothermal heat exploitation and utilization system of claim 1, wherein a steam regulating valve and a gas-liquid separator are connected between the working medium outlet end of the heat pipe and the working medium inlet end of the primary heat utilization device, and a return flow regulating valve is connected between the working medium outlet end of the primary heat utilization device and the working medium inlet end of the heat pipe.
3. The combined geothermal development and utilization system of claim 2, wherein the primary heat utilization device is a ground power plant comprising a steam turbine, a generator, a condenser; the heat pipe is used as an evaporator of the ground power generation device, the ground power generation device is equivalent to a condensation section of the heat pipe, working medium in the heat pipe is vaporized after heat is obtained and is conveyed to the gas-liquid separator through the steam regulating valve, vapor phase fluid separated by the gas-liquid separator enters the steam turbine to do work to drive the generator to generate power, the vapor phase fluid enters the steam condenser to further release heat and liquefy after the work is done and enters the working medium recycling storage device, and liquid working medium in the pipe enters the heat pipe through the backflow regulating valve to form closed circulation.
4. The integrated geothermal development and utilization system of claim 3, wherein the steam condenser is further coupled to a direct heating system.
5. The integrated geothermal heat development and utilization system of claim 4, wherein a heat exchanger is connected to the inlet of the injection pump and the pipe in communication with the gap, and the heat exchanger is further connected to a heat pump and a waste heat cascade utilization system.
6. The combined geothermal exploitation and utilization system of claim 5, wherein the steam turbine is configured to adjust a back pressure of the steam turbine, and the steam turbine controls the steam pressure, the circulation flow, the operating temperature, and the back pressure of the steam turbine to adjust the power generation and distribute the energy of the thermal storage medium for different step utilization.
7. The combined geothermal development and utilization system of any one of claims 1-6, wherein the production well is one well, or a plurality of wells.
8. The integrated geothermal development and utilization system of any one of claims 1 to 6, wherein the heat pipes are designed as equal diameter pipes inserted into an open section of the production well or are designed as stepped diameters inserted into open sections of the production well; the outer wall of the gravity heat pipe is a smooth wall surface or a reinforced heat exchange element is added.
9. The combined geothermal development and utilization system of any one of claims 1 to 6, wherein the thermal storage medium comprises water and/or carbon dioxide; the working medium in the tube comprises one or more of water, liquid ammonia, pentane, alcohol, R134a and R410 a.
10. An energy distribution management method of a combined geothermal development and utilization system, the system of claim 6, comprising:
calculating the steam internal energy required by the heat pipe according to the power generation requirement and efficiency;
adjusting the opening of a steam adjusting valve, controlling the outlet temperature of the steam condenser to enable the working temperature of the heat pipe to be gradually matched with the power generation requirement, and simultaneously providing heat for the direct heat supply system by the external circulation of the steam condenser;
the injection pump is adjusted to control the flow of the heat storage working medium, the heat exchanger is adjusted to control the injection temperature of the heat storage working medium, and heat is transferred to the waste heat cascade utilization system.
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| US11549495B2 (en) | 2020-09-16 | 2023-01-10 | Tianjin University | Power generation model based on a transcritical cycle with an increasing-pressure endothermic process using CO2-based mixture working fluids for an enhanced geothermal system |
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