CN104929875B - Underground heat and solar combined power generating system and underground heat and solar combined power generating method - Google Patents

Underground heat and solar combined power generating system and underground heat and solar combined power generating method Download PDF

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CN104929875B
CN104929875B CN201510300869.2A CN201510300869A CN104929875B CN 104929875 B CN104929875 B CN 104929875B CN 201510300869 A CN201510300869 A CN 201510300869A CN 104929875 B CN104929875 B CN 104929875B
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underground heat
regenerator
pressure
carbon
dioxide
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CN104929875A (en
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姜培学
张富珍
胥蕊娜
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Tsinghua University
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Tsinghua University
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/10Geothermal energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

Abstract

The invention discloses a kind of underground heat and solar combined power generating system and underground heat and solar combined power generating method.Underground heat and the solar combined power generating system includes:At least three heat reservoris;At least three injection wells and withdrawal well, heat reservori are connected with the gas outlet of injection well and the air inlet of withdrawal well;At least three underground heat turbines, the air inlet of underground heat turbine is connected with the gas outlet of withdrawal well;Gas cooler;First and second regenerators, the gases at high pressure import of the first regenerator is connected with the gas outlet of one positioned at the top in withdrawal well, and the gases at high pressure import of the second regenerator is connected with one in underground heat turbine;Solar receiver, the air inlet of solar receiver is connected with the second regenerator;With solar energy turbine, the air inlet of solar energy turbine is connected with solar receiver and gas outlet is connected with the second regenerator.Underground heat and the solar combined power generating system has the advantages that simple in construction, manufacturing cost is low, the thermal efficiency is high, easy to implement.

Description

Underground heat and solar combined power generating system and underground heat and solar combined power generating method
Technical field
The present invention relates to underground heat and solar combined power generating system, underground heat and solar combined power generating method are further related to.
Background technology
Existing underground heat and solar combined power generating system using carbon dioxide as working medium compresses backheat by using pumping The thermal efficiency of raising system, its reason is:The specific heat capacity of carbon dioxide has larger difference with the change of pressure, for example, In 200 degrees Celsius, the specific heat capacity difference of 15MPa carbon dioxide and 8MPa carbon dioxide is larger.So, returned using simple During thermal cycle, thermal capacitance (mass flow and the specific heat capacity of high pressure low temperature carbon dioxide and low-voltage high-temperature carbon dioxide in heat exchanger Product) difference is larger, then heat transfer temperature difference can be increased, and the heat transfer irreversibility of system is increased.It is evacuated using from low pressure exhaust steam Backheat and the method for part cooling, can reduce on high-tension side thermal capacitance to be allowed to the thermal capacitance with the carbon dioxide of low-pressure side after compression Match, reduce heat transfer temperature difference, so that the heat in the exhaust steam of turbine outlet is utilized as far as possible by backheat.
But the realization of pumping compression backheat needs compressor Effec-tive Function at high temperature under high pressure.Specifically, face super In boundary's fluid Brayton cycle, the working environment very severe of the compressor of pumping compression backheat, although pressure ratio is little, but two The adiabatic exponent of carbonoxide is big, and the temperature of the compression final state of carbon dioxide may be up to 200 degrees Celsius, and operating pressure also exists More than 20MPa, this brings many problems to the design and manufacture of compressor.
At present, the compressor of Effec-tive Function is not commercialized also at high temperature under high pressure, so as to cause to utilize pumping compression backheat Laboratory stage is also rested on come the method for the thermal efficiency for improving existing underground heat and solar combined power generating system.Even if after The compressor of Effec-tive Function at high temperature under high pressure is produced, the system of underground heat and solar combined power generating system can be also greatly increased Make difficulty, manufacturing cost and operating cost.
The content of the invention
The application is that discovery based on inventor to following facts and problem and understanding are made:Carbon dioxide is by injection After the output process of endothermic process and withdrawal well in the injection process of well, heat reservori, compared to injection well, carbon dioxide All it is higher than the implantation temperature and pressure of injection well in the temperature and pressure of withdrawal well well head.That is, with the change of temperature, The variable density of carbon dioxide is than larger, and this causes enhanced geothermal system not only to serve a thermal source to carbon dioxide and add Heat effect, and serve the compression of a compressor.Under identical injection pressure and turbine outlet pressure, withdrawal well production The temperature and pressure of the carbon dioxide gone out is improved with the increase of heat reservori depth.
It therefore, it can the heating using enhanced geothermal system and compression, to replace in solar heat power generation system Compressor (i.e. the compressor for the Effec-tive Function at high temperature under high pressure that background section is referred to).Due in solar energy thermal-power-generating Need the thermal source of different grades, therefore layering can be carried out to heat reservori to excite, thus not only can fully using injection and Withdrawal well, and the thermal source of different grades can be obtained.
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, the present invention is carried Go out a kind of underground heat and solar combined power generating system for having the advantages that manufacturing cost is low, the thermal efficiency is high.
The present invention also proposes a kind of underground heat implemented using the underground heat and solar combined power generating system and solar united Close electricity-generating method.
The underground heat of embodiment and solar combined power generating system include according to a first aspect of the present invention:At least three heat storages Layer, at least three heat reservori is set at interval along the vertical direction;At least three injection wells and at least three withdrawal wells, institute The gas outlet and at least three heat reservori for stating at least three injection wells are connected so as to described at least three correspondingly Heat reservori injects carbon dioxide, the air inlet of at least three withdrawal well and at least three heat reservori phase correspondingly Connect to export carbon dioxide;At least three underground heat turbines, the air inlet of at least three underground heat turbine correspondingly with The gas outlet connection of at least three withdrawal well;Gas cooler, the air inlet of the gas cooler and described at least three The first gas outlet connection of individual underground heat turbine, the gas outlet of the gas cooler and the air inlet of at least three injection well Connection;First regenerator and the second regenerator, the gases at high pressure import of first regenerator and at least three withdrawal well In the gas outlet of one positioned at the top connect, the low pressure. gas outlet of first regenerator and the gas cooler Second gas outlet of one in connection, the gases at high pressure import of second regenerator and at least three underground heat turbine and The gases at high pressure outlet of first regenerator, the low pressure. gas outlet of second regenerator and first regenerator Low-pressure gas inlet communication, wherein one air inlet and described at least three at least three underground heat turbine The gas outlet connection of a withdrawal well in addition to positioned at one of the top in withdrawal well;Solar receiver, it is described The gases at high pressure outlet of the air inlet of solar receiver and second regenerator;With solar energy turbine, the sun The air inlet of energy turbine is connected with the gas outlet of the solar receiver, the gas outlet of the solar energy turbine and described second The low-pressure gas inlet communication of regenerator.
It is excellent that underground heat and solar combined power generating system according to embodiments of the present invention has that manufacturing cost is low, the thermal efficiency is high Point.
In addition, underground heat according to the above embodiment of the present invention and solar combined power generating system can also have following add Technical characteristic:
According to one embodiment of present invention, underground heat and the solar combined power generating system further comprises at least three Compressor, the air inlet of at least three compressor is connected with the gas outlet of the gas cooler, at least three pressure Air inlet of the gas outlet of contracting machine correspondingly with least three injection well is connected.
According to one embodiment of present invention, at least three injection well includes upper injection well, middle injection well and bet Enter well, at least three withdrawal well includes withdrawal well at least one, withdrawal well and at least one lower output at least one Well, at least three heat reservori is upper including what is be connected with the gas outlet of the upper injection well and the air inlet of the upper withdrawal well Middle heat reservori that the air inlet of heat reservori, the gas outlet with the middle injection well and the middle withdrawal well is connected and with it is described under The lower heat reservori that the gas outlet of injection well is connected with the air inlet of the lower withdrawal well, at least three underground heat turbine includes the One underground heat turbine, the second underground heat turbine and the 3rd underground heat turbine, the air inlet of the first underground heat turbine and the upper withdrawal well Gas outlet connection, the air inlet of the second underground heat turbine connects with the gas outlet of the middle withdrawal well, the 3rd underground heat The air inlet of turbine is connected with the gas outlet of the upper withdrawal well.
According to one embodiment of present invention, the air inlet of the first underground heat turbine passes through first flow regulating valve and institute State the gas outlet connection of withdrawal well, the gases at high pressure import of first regenerator by second flow regulating valve with it is described on The gas outlet connection of withdrawal well.
According to one embodiment of present invention, the gases at high pressure import of second regenerator and the second underground heat turbine The connection of the second gas outlet, underground heat and the solar combined power generating system further comprises:3rd regenerator, described 3rd time The gases at high pressure import of hot device goes out with the second gas outlet of the 3rd underground heat turbine and the gases at high pressure of second regenerator Mouth connection, the gases at high pressure outlet of the 3rd regenerator is connected with the air inlet of the solar receiver, described 3rd time The low-pressure gas import of hot device is connected with the gas outlet of the solar energy turbine, the low pressure. gas outlet of the 3rd regenerator with The low-pressure gas inlet communication of second regenerator.
According to one embodiment of present invention, the second gas outlet of the second underground heat turbine passes through the 3rd flow control valve With the gases at high pressure inlet communication of second regenerator, the second gas outlet of the 3rd underground heat turbine is adjusted by the 4th flow Save the gases at high pressure inlet communication of valve and the 3rd regenerator.
The utilization of embodiment described underground heat and solar united according to a first aspect of the present invention according to a second aspect of the present invention Underground heat and solar combined power generating method that electricity generation system is implemented are closed, underground heat and the solar combined power generating method includes following Step:At least three heat reservori is provided;By at least three injection well correspondingly to described at least three heat Injection carbon dioxide in reservoir, to be heated using at least three heat reservori to carbon dioxide;By it is described at least Three withdrawal wells convey heated carbon dioxide at least three underground heat turbine correspondingly, and carbon dioxide is described Expansion work is to produce electric energy and the first carbon dioxide exhaust steam at least three underground heat turbines;It is cold using the gas cooler The first carbon dioxide exhaust steam, is then stored up to described at least three heat correspondingly by least three injection well Injection first carbon dioxide in layer;With in peak of power consumption, by least three withdrawal well be located at the top One a part of heated carbon dioxide is transported in first regenerator, carbon dioxide is in first regenerator It is interior to be heated by the second carbon dioxide exhaust steam, when carbon dioxide expanded in one at least three underground heat turbine arrives Pressure be equal at least three withdrawal well in an output positioned at the top carbon dioxide pressure when, it is described at least A part for carbon dioxide in one in three underground heat turbines is transported to second regenerator and described the Added in two regenerators together with the heated carbon dioxide from first regenerator by the second carbon dioxide exhaust steam Heat, remaining carbon dioxide continues expansion work;Then the heated carbon dioxide in second regenerator enters institute State in solar receiver and absorb solar energy to reach running temperature, the carbon dioxide for finally reaching running temperature is entered In the solar energy turbine and expansion work is to produce electric energy and the second carbon dioxide exhaust steam.
According to one embodiment of present invention, underground heat and the solar combined power generating method further comprises using described The first carbon dioxide exhaust steam after cooling is compressed to corresponding predetermined pressure by least three compressors, then by described At least three injection wells injected correspondingly at least three heat reservori it is corresponding with predetermined pressure described the One carbon dioxide.
According to one embodiment of present invention, be injected into the middle injection well carbon dioxide pressure be more than be injected into institute State the pressure of the carbon dioxide of injection well and less than the pressure for the carbon dioxide for being injected into the lower injection well, be injected into described The temperature of the carbon dioxide of middle injection well, which is more than the temperature for the carbon dioxide for being injected into the upper injection well and is less than, is injected into institute State the temperature of the carbon dioxide of lower injection well, be injected into the middle injection well carbon dioxide flow be more than be injected on described The flow of the carbon dioxide of injection well and the flow for being less than the carbon dioxide for being injected into the lower injection well, the middle withdrawal well production The temperature of the carbon dioxide gone out is more than the temperature of the carbon dioxide of the upper withdrawal well output and less than the lower withdrawal well output Carbon dioxide temperature, the pressure of the carbon dioxide of the middle withdrawal well output is more than the titanium dioxide of the upper withdrawal well output The pressure of carbon and less than the lower withdrawal well output carbon dioxide pressure.
According to one embodiment of present invention, underground heat and the solar combined power generating method further comprises:When described It is described during the pressure of the carbon dioxide expanded carbon dioxide for being equal to the upper withdrawal well output to pressure in the 3rd underground heat turbine A part for carbon dioxide in 3rd underground heat turbine be transported to the 3rd regenerator and in the 3rd regenerator with Heated carbon dioxide from second regenerator is heated by the second carbon dioxide exhaust steam together, remaining dioxy Change carbon and continue expansion work;Entered with the heated carbon dioxide in the 3rd regenerator in the solar receiver And absorb solar energy to reach running temperature.
According to one embodiment of present invention, the temperature of the carbon dioxide in the gases at high pressure exit of first regenerator Equal to the temperature for the carbon dioxide that second regenerator is transported to from the second underground heat turbine, the height of second regenerator The temperature of the carbon dioxide of gas outlet is pressed to be equal to the dioxy for being transported to the 3rd regenerator from the 3rd underground heat turbine Change the temperature of carbon.
According to one embodiment of present invention, the pressure for the second carbon dioxide exhaust steam that the solar energy turbine is produced The pressure of the first carbon dioxide exhaust steam produced equal to each underground heat turbine.
Brief description of the drawings
Fig. 1 is underground heat according to embodiments of the present invention and the structural representation of solar combined power generating system.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings.Below with reference to The embodiment of accompanying drawing description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Below with reference to the accompanying drawings underground heat according to embodiments of the present invention and solar combined power generating system 10 are described.Such as Fig. 1 institutes Show, underground heat according to embodiments of the present invention and solar combined power generating system 10 include at least three heat reservoris, at least three notes Enter well, at least three withdrawal wells, at least three underground heat turbines, gas cooler 105, the first regenerator 1061, the second regenerator 1062nd, solar receiver 1071 and solar energy turbine 1072.
At least three heat reservoris are set at interval along the vertical direction.The gas outlet of at least three injection wells and at least three Heat reservori correspondingly be connected so as to at least three heat reservoris inject carbon dioxide, the air inlet of at least three withdrawal wells with At least three heat reservoris are connected to export carbon dioxide correspondingly.The air inlet of at least three underground heat turbines is corresponded Ground is connected with the gas outlet of at least three withdrawal wells.
In other words, the quantity of the quantity of heat reservori, the quantity of the injection well, the quantity of the withdrawal well and the underground heat turbine can With equal, the gas outlet of the injection well is connected with a heat reservori, the air inlet and a heat reservori of the withdrawal well It is connected, the air inlet of the underground heat turbine is connected with the gas outlet of the withdrawal well.
The air inlet of gas cooler 105 is connected with the first gas outlet of at least three underground heat turbines, gas cooler 105 Gas outlet connected with the air inlet of at least three injection wells.That is, the first gas outlet of each underground heat turbine with The air inlet of gas cooler 105 is connected, and each gas outlet of the air inlet of the injection well with gas cooler 105 is connected.
The gases at high pressure import of first regenerator 1061 goes out with one 's positioned at the top at least three withdrawal wells Gas port is connected, and the low pressure. gas outlet of the first regenerator 1061 is connected with gas cooler 105.The high pressure of second regenerator 1062 Gas feed is exported with second gas outlet of one at least three underground heat turbines and the gases at high pressure of the first regenerator 1061 The low-pressure gas inlet communication of connection, the low pressure. gas outlet of the second regenerator 1062 and the first regenerator 1061.
Wherein, in the one air inlet and at least three withdrawal wells at least three underground heat turbines except positioned at The gas outlet connection of a withdrawal well outside one of the top.That is, with least three underground heat turbines described in The withdrawal well of the air inlet connection of one is not located at a withdrawal well of the top.In other words, with the second regenerator 1062 Gases at high pressure inlet communication underground heat turbine is referred to as backheat underground heat turbine, then connected with the air inlet of the backheat underground heat turbine Withdrawal well is not located at a withdrawal well of the top.
The gases at high pressure outlet of the air inlet of solar receiver 1071 and the second regenerator 1062.Solar energy turbine 1072 air inlet is connected with the gas outlet of solar receiver 1071, the gas outlet of solar energy turbine 1072 and the second regenerator 1062 low-pressure gas inlet communication.
The output process of endothermic process and withdrawal well in injection process of the carbon dioxide Jing Guo injection well, heat reservori with Afterwards, compared to injection well, carbon dioxide is all higher than the implantation temperature and pressure of injection well in the temperature and pressure of withdrawal well well head. That is, with the change of temperature, the variable density of carbon dioxide is than larger, and this causes enhanced geothermal system not only to two Carbonoxide serves the heat effect of a thermal source, and serves the compression of a compressor.In identical injection pressure Under turbine outlet pressure, the temperature and pressure of the carbon dioxide of withdrawal well output is improved with the increase of heat reservori depth.
It therefore, it can the heating using enhanced geothermal system and compression, to replace in solar heat power generation system Compressor (i.e. the compressor for the Effec-tive Function at high temperature under high pressure that background section is referred to).Due in solar energy thermal-power-generating The thermal source of different grades is needed, therefore heat reservori progress layering can be excited, thus not only injection can be fully being utilized In the case of withdrawal well, the fully heat of exploitation heat reservori, and the thermal source of different grades can be obtained.
Underground heat according to embodiments of the present invention and solar combined power generating system 10 can include system for geothermal production of electricity and too Positive energy heat generating system.Wherein, the system for geothermal production of electricity includes at least three heat reservoris, at least three injection wells, at least three Withdrawal well, at least three underground heat turbines and gas cooler 105, the solar heat power generation system include the first regenerator 1061, Second regenerator 1062, solar receiver 1071 and solar energy turbine 1072.
Describe what is implemented using underground heat according to embodiments of the present invention and solar combined power generating system 10 below with reference to Fig. 1 Underground heat and solar combined power generating method (i.e. underground heat and solar combined power generating system 10) course of work.According to of the invention real The underground heat and solar combined power generating method for applying example comprise the following steps:
At least three heat reservoris are provided;
Carbon dioxide is injected at least three heat reservoris correspondingly by least three injection wells, so as to using extremely Few three heat reservoris are heated to carbon dioxide;
Heated carbon dioxide, two are conveyed by least three withdrawal wells at least three underground heat turbines correspondingly Carbonoxide at least three underground heat turbines expansion work to produce electric energy and the first carbon dioxide exhaust steam;
The first carbon dioxide exhaust steam is cooled down using gas cooler 105, is then corresponded by least three injection wells Ground injects the first carbon dioxide at least three heat reservoris;With
In peak of power consumption, by one positioned at the top at least three withdrawal wells by a part of heated two Carbonoxide is transported in the first regenerator 1061, and carbon dioxide is added in the first regenerator 1061 by the second carbon dioxide exhaust steam Heat,
When one interior carbon dioxide expanded pressure that arrives at least three underground heat turbines is equal at least about three outputs During the pressure of the carbon dioxide of the output positioned at the top in well, in one at least three underground heat turbines A part for carbon dioxide is transported to the second regenerator 1062 and in the second regenerator 1062 with coming from the first regenerator 1061 heated carbon dioxide is heated by the second carbon dioxide exhaust steam together, and remaining carbon dioxide, which continues expansion, to be done Work(;
Then the heated carbon dioxide in the second regenerator 1062 is entered in solar receiver 1071 and absorbed Solar energy is to reach running temperature, and the carbon dioxide for finally reaching running temperature is entered in solar energy turbine 1072 and expanded Do work to produce electric energy and the second carbon dioxide exhaust steam.
Underground heat according to embodiments of the present invention and solar combined power generating system 10 by setting at least three heat reservoris, from And other withdrawal wells in addition to a withdrawal well positioned at the top can be made equivalent to compressor so as to carbon dioxide It is compressed.Thus underground heat and the solar heat power generation system of solar combined power generating system 10 need not set compressor again, So as to so as to be achieved using the underground heat and solar combined power generating system 10 of bled steam.
Moreover, underground heat according to embodiments of the present invention and solar combined power generating system 10 are by setting the second regenerator 1062, so as to carry out bled steam to the partial CO 2 in the underground heat turbine, it is possible thereby to be greatly enhanced underground heat With the thermal efficiency of solar combined power generating system 10.
Therefore, underground heat according to embodiments of the present invention and solar combined power generating system 10 have it is simple in construction, be manufactured into This low, thermal efficiency is high, it is easy to implement the advantages of.
As shown in figure 1, including upper note according to the underground heat of some embodiments of the present invention and solar combined power generating system 10 Enter well 1021, middle injection well 1022, lower injection well 1023, withdrawal well 1031 at least one, withdrawal well 1032 at least one, At least one lower withdrawal well 1033, upper heat reservori 1011, middle heat reservori 1012, lower heat reservori 1013, the first underground heat turbine 1041, Second underground heat turbine 1042, the 3rd underground heat turbine 1043, three compressors 108, gas cooler 105, the first regenerator 1061, Second regenerator 1062, the 3rd regenerator 1063, solar receiver 1071 and solar energy turbine 1072.
Wherein, underground heat turbine refers to the turbine for the system for geothermal production of electricity, and solar energy turbine 1072 refers to be used for this too The turbine of positive energy heat generating system.
Advantageously, underground heat according to embodiments of the present invention and the system for geothermal production of electricity of solar combined power generating system 10 are increasing Strong type underground heat (EGS) electricity generation system.In other words, underground heat and solar combined power generating system 10 are enhanced underground heat and solar united Close electricity generation system.
Specifically, the depth of upper heat reservori 1011 is 1900 meters -2100 meters, and the depth of middle heat reservori 1012 is 3900 - 4100 meters of rice, the depth of lower heat reservori 1013 is 5900 meters -6100 meters.The temperature of lower heat reservori 1013 is more than middle heat reservori 1012 temperature, the temperature of middle heat reservori 1012 is more than the temperature of upper heat reservori 1011.
The pressure of carbon dioxide of lower injection well 1023 is injected into more than the carbon dioxide for being injected into middle injection well 1022 Pressure, the pressure for being injected into the carbon dioxide of middle injection well 1022 is more than the pressure for the carbon dioxide for being injected into injection well 1021 Power.The temperature for being injected into the carbon dioxide of lower injection well 1023 is more than the temperature for the carbon dioxide for being injected into middle injection well 1022, The temperature for being injected into the carbon dioxide of middle injection well 1022 is more than the temperature for the carbon dioxide for being injected into injection well 1021.Injection Flow to the carbon dioxide of lower injection well 1023 is more than the flow for the carbon dioxide for being injected into middle injection well 1022, in being injected into The flow of the carbon dioxide of injection well 1022 is more than the flow for the carbon dioxide for being injected into injection well 1021.
The temperature of the carbon dioxide of the lower output of withdrawal well 1033 is more than the temperature of the carbon dioxide of the middle output of withdrawal well 1032, The temperature of the carbon dioxide of the middle output of withdrawal well 1032 is more than the temperature of the carbon dioxide of the upper output of withdrawal well 1031.Lower withdrawal well The pressure of the carbon dioxide of 1033 outputs is more than the pressure of the carbon dioxide of the middle output of withdrawal well 1032, the middle output of withdrawal well 1032 Carbon dioxide pressure be more than the upper output of withdrawal well 1031 carbon dioxide pressure.
As shown in figure 1, gas outlet of the upper heat reservori 1011 with upper injection well 1021 and withdrawal well 1031 at least one Air inlet is connected, the air inlet phase of middle heat reservori 1012 withdrawal well 1032 with the gas outlet of middle injection well 1022 and at least one Even, lower heat reservori 1013 is connected with the air inlet of the gas outlet of lower injection well 1023 and at least one lower withdrawal well 1033.By upper The carbon dioxide that injection well 1021 is injected into heat reservori 1011 is heated by upper heat reservori 1011, is injected by middle injection well 1022 Heated to the carbon dioxide in middle heat reservori 1012 by middle heat reservori 1012, lower heat reservori 1013 is injected into by lower injection well 1023 Interior carbon dioxide is heated by lower heat reservori 1013.
The air inlet of first underground heat turbine 1041 passes through first flow regulating valve 1091 and the gas outlet of upper withdrawal well 1031 Connection, the air inlet of the second underground heat turbine 1042 connects with the gas outlet of middle withdrawal well 1032, and the 3rd underground heat turbine 1043 enters Gas port is connected with the gas outlet of upper withdrawal well 1031.Carbon dioxide after heating is in the first underground heat turbine 1041, the second ground heat penetration Flat 1042 and the 3rd expansion work in underground heat turbine 1043, and produce the first carbon dioxide exhaust steam.That is, the first ground heat penetration Each in flat 1041, second underground heat turbine 1042 and the 3rd underground heat turbine 1043 produces the first carbon dioxide exhaust steam.
The air inlet of gas cooler 105 and the first underground heat turbine 1041, the second underground heat turbine 1042 and the 3rd ground heat penetration The first gas outlet of each connection in flat 1043, so as to the first underground heat turbine 1041, the second underground heat turbine 1042 and the First carbon dioxide exhaust steam of three underground heat turbines 1043 discharge is cooled down.
As shown in figure 1, the air inlet of three compressors 108 is connected with the gas outlet of gas cooler 105, i.e., each compression Gas outlet of the air inlet of machine 108 all with gas cooler 105 is connected.The gas outlet of three compressors 108 correspondingly with Air inlet, the air inlet of middle injection well 1022 of upper injection well 1021 are connected with the air inlet of lower injection well 1023.
Specifically, the gas outlet of first compressor 108 is connected with the air inlet of upper injection well 1021, second compression The gas outlet of machine 108 is connected with the air inlet of middle injection well 1022, the gas outlet of the 3rd compressor 108 and lower injection well 1023 Air inlet connection.It is possible thereby to which the first carbon dioxide exhaust steam after cooling is compressed to accordingly using three compressors 108 Predetermined pressure, is then injected separately into upper heat reservori by upper injection well 1021, middle injection well 1022 and lower injection well 1023 1011st, in middle heat reservori 1012 and lower heat reservori 1013.
By setting compressor 108, so as to so that the first underground heat turbine 1041, the second underground heat turbine 1042 and the 3rd ground Heat penetration flat 1043 is expanded into preferable pressure, to improve the first underground heat turbine 1041, the second underground heat turbine 1042 and the 3rd ground The output work of heat penetration flat 1043.
In the specific example of the present invention, the gas outlet of gas cooler 105 passes through the 5th flow control valve 1095 Connected with the air inlet of first compressor 108, the gas outlet of gas cooler 105 passes through the 6th flow control valve 1096 and The air inlet connection of two compressors 108, the gas outlet of gas cooler 105 passes through the 7th flow control valve 1097 and the 3rd The air inlet connection of compressor 108.It is possible thereby to pass through the 5th flow control valve 1095, the 6th flow control valve 1096 and the 7th The regulation of flow control valve 1097 enters injection well 1021, middle injection well 1022 and the carbon dioxide in lower injection well 1023 Flow.
As shown in figure 1, in some examples of the present invention, the gases at high pressure import of the first regenerator 1061 passes through second Adjustable valve 1092 is connected with the gas outlet of upper withdrawal well 1031, and the second gas outlet of the second underground heat turbine 1042 passes through the 3rd stream The gases at high pressure inlet communication of the regenerator 1062 of adjustable valve 1093 and second, the second gas outlet of the 3rd underground heat turbine 1043 leads to Cross the gases at high pressure inlet communication of the 4th flow control valve 1094 and the 3rd regenerator 1063.
Wherein, the low pressure. gas outlet of the first regenerator 1061 is connected with the air inlet of gas cooler 105.Second backheat The gases at high pressure import of device 1062 and the gases at high pressure outlet of the first regenerator 1061, the low pressure gas of the second regenerator 1062 Body exports the low-pressure gas inlet communication with the first regenerator 1061.The gases at high pressure import of 3rd regenerator 1063 with second time The low pressure of the gases at high pressure outlet of hot device 1062, the low pressure. gas outlet of the 3rd regenerator 1063 and the second regenerator 1062 Gas feed is connected.The gases at high pressure outlet of 3rd regenerator 1063 is connected with the air inlet of solar receiver 1071, and the 3rd The low-pressure gas import of regenerator 1063 is connected with the gas outlet of solar energy turbine 1072.
In peak of power consumption, a part for the carbon dioxide of the upper output of withdrawal well 1031 is transported to the first regenerator 1061 Interior, carbon dioxide is heated in the first regenerator 1061 by the second carbon dioxide exhaust steam.
When the carbon dioxide expanded titanium dioxide for being equal to the upper output of withdrawal well 1031 to pressure in the second underground heat turbine 1042 During the pressure of carbon, a part for the carbon dioxide in the second underground heat turbine 1042 is transported to the second regenerator 1062 and second Added in regenerator 1062 together with the heated carbon dioxide from the first regenerator 1061 by the second carbon dioxide exhaust steam Remaining carbon dioxide in heat, the second underground heat turbine 1042 continues expansion work.
When the carbon dioxide expanded titanium dioxide for being equal to the upper output of withdrawal well 1031 to pressure in the 3rd underground heat turbine 1043 During the pressure of carbon, a part for the carbon dioxide in the 3rd underground heat turbine 1043 is transported to the 3rd regenerator 1063 and the 3rd Added in regenerator 1063 together with the heated carbon dioxide from the second regenerator 1062 by the second carbon dioxide exhaust steam Remaining carbon dioxide in heat, the 3rd underground heat turbine 1043 continues expansion work.
Heated carbon dioxide in 3rd regenerator 1063 enters in solar receiver 1071 and absorbs the sun Can and reach running temperature.Finally, reach that the carbon dioxide of running temperature is entered in solar energy turbine 1072 and expansion work To produce electric energy and the second carbon dioxide exhaust steam.
Advantageously, the temperature of the carbon dioxide in the gases at high pressure exit of the first regenerator 1061 is equal to from the second ground heat penetration Flat 1042 are transported to the temperature of the carbon dioxide of the second regenerator 1062, the two of the gases at high pressure exit of the second regenerator 1062 The temperature of carbonoxide is equal to the temperature for the carbon dioxide that the 3rd regenerator 1063 is transported to from the 3rd underground heat turbine 1043.
In the example of the present invention, the pressure for the second carbon dioxide exhaust steam that solar energy turbine 1072 is produced is equal to often The pressure for the first carbon dioxide exhaust steam that individual underground heat turbine is produced.
The present invention according to the characteristic of enhanced geothermal system and can excite situation, to determine the system for geothermal production of electricity (base This load electricity generation system) and the solar heat power generation system (peak load electricity generation system) generation load.
The present invention according to the characteristic of enhanced geothermal system and can excite the fortune of situation and solar receiver 1071 Row parameter, to determine the operating pressure, the injection pressure of upper injection well 1021, middle note of underground heat and solar combined power generating system 10 Enter the injection pressure of well 1022 and the injection pressure of lower injection well 1023.Outlet temperature of the invention according to upper withdrawal well 1031 The outlet temperature of (i.e. the temperature of exit carbon dioxide, as follows), the outlet temperature of middle withdrawal well 1032 and lower withdrawal well 1033 Degree, according to the principle of energy match, the carbon dioxide of the different grades of different heat reservori outputs is injected separately into the circulatory system.
Underground heat and the backheat series of solar combined power generating system 10 can according to high-low pressure fluid specific heat capacity with temperature Variation Features and the outlet temperature of upper withdrawal well 1031, the outlet temperature of middle withdrawal well 1032 and lower withdrawal well 1033 Outlet temperature is determined, so that the fluid in the high pressure fluid channel and low pressure fluid passage in each regenerator is with optimal heat transfer The temperature difference is run.
The present invention is accurately set by the calculating of heat reservori heat transfer flow, energy match method and carbon dioxide Physical Property Analysis Backheat series, each runner flow are counted, with the heat to power output efficiency being optimal.Do not considering in addition to three compressors 108 The individually enhanced geothermal power generation of the net output ratio of the electricity consumption of auxiliary and safeguards system, underground heat and solar combined power generating system 10 Increased with the output sum of solar energy thermal-power-generating so that the thermal efficiency improves 1%.Meanwhile, by assignment of traffic so that ground Heat and solar combined power generating system 10 can either meet basic electricity load, while also can in the case of minimum investment Ensure peak value power load.
In the specific example of the present invention, upper 1011 located underground 1900 meters of -2100 meters of depths of heat reservori, upper heat storage The temperature of layer 1011 is 115 DEG C, middle 1012 located underground 3900 meters of -4100 meters of depths of heat reservori, the temperature of middle heat reservori 1012 For 205 DEG C, lower 1013 located underground 5900 meters of -6100 meters of depths of heat reservori, the temperature of lower heat reservori 1013 is 295 DEG C.
It is injected up that pressure is injected in well 1021 is the carbon dioxide that 9.4MPa, temperature are 40 DEG C, flow is 39.0kg/s, Carbon dioxide injects upper heat reservori 1011 by upper injection well 1021, and carbon dioxide absorbs in upper heat reservori 1011 to be led to after heat Cross the output of withdrawal well 1031.The upper output pressure of withdrawal well 1031 is 13.0MPa, the carbon dioxide that temperature is 75.2 DEG C.
It is the carbon dioxide that 9.8MPa, temperature are 41.5 DEG C, flow is 39.6kg/s to inject pressure to middle injection well 1022, Heat reservori 1012 during carbon dioxide is injected by middle injection well 1022, carbon dioxide absorbs in middle heat reservori 1012 to be led to after heat Cross the middle output of withdrawal well 1032.The middle output pressure of withdrawal well 1032 is 20MPa, the carbon dioxide that temperature is 147.9 DEG C.
It is the titanium dioxide that 10.6MPa, temperature are 44.3 DEG C, flow is 40.2kg/s to be injected downwardly into the injection pressure of well 1023 Carbon, carbon dioxide injects lower heat reservori 1013 by lower injection well 1023, and carbon dioxide absorbs heat in lower heat reservori 1013 Pass through the lower output of withdrawal well 1033 afterwards.The lower output pressure of withdrawal well 1033 is 27.9MPa, the carbon dioxide that temperature is 226.4 DEG C.
The flow of the upper output of withdrawal well 1031 passes through first flow regulating valve 1091 and for 39.0kg/s carbon dioxide Two flow control valves 1092 are divided into two strands.Wherein, the titanium dioxide for being 20.3kg/s by the flow of first flow regulating valve 1091 Carbon enters in the first underground heat turbine 1041 becomes the first carbon dioxide exhaust steam after expansion work, and pressure is reduced to 8.2MPa.This One carbon dioxide exhaust steam enters in gas cooler 105 is cooled to 35 DEG C by surrounding medium.5th flow control valve 1095 will be from The Flow-rate adjustment for 35 DEG C of the carbon dioxide that gas cooler 105 is discharged is 39.0kg/s.Flow is 39.0kg/s titanium dioxide Carbon enters first compressor 108, and CO 2 fluid is compressed to 9.4MPa, dioxy by first compressor 108 from 8.2MPa The temperature for changing carbon flow body is increased to 40 DEG C from 35 DEG C.The pressure that first compressor 108 is discharged is that 9.4MPa, temperature are 40 DEG C Carbon dioxide is entered in upper heat reservori 1011 by upper injection well 1021.
The flow of the middle output of withdrawal well 1032 enters in the second underground heat turbine 1042 for 39.6kg/s carbon dioxide to be expanded Acting.When carbon dioxide is reduced to 13.0MPa by the bulbs of pressure, i.e., extract 5.6kg/s out from the second underground heat turbine 1042 Carbon dioxide, by the second regenerator of introducing 1062 gases at high pressure import.Remaining 34.0kg/s carbon dioxide is Continue to be expanded into 8.2MPa in two underground heat turbines 1042, become the first carbon dioxide exhaust steam.The first carbon dioxide exhaust steam enters In gas cooler 105 35 DEG C are cooled to by surrounding medium, the 6th flow control valve 1096 will be discharged from gas cooler 105 The Flow-rate adjustment of 35 DEG C of carbon dioxide is 39.6kg/s.Flow enters second compressor for 39.6kg/s carbon dioxide 108, carbon dioxide is compressed to 9.8MPa by second compressor 108 from 8.2MPa, and the temperature of carbon dioxide is increased to from 35 DEG C 41.5℃.The pressure that second compressor 108 is discharged is 9.8MPa, the carbon dioxide that temperature is 41.5 DEG C passes through middle injection well In 1022 entrance in heat reservori 1012.
The flow of the lower output of withdrawal well 1033 enters in the 3rd underground heat turbine 1043 for 40.2kg/s carbon dioxide to be expanded Acting.When carbon dioxide is reduced to 13.0MPa by expansion work pressure, i.e., extracted out from the 3rd underground heat turbine 1043 5.7kg/s carbon dioxide, by the regenerator 1063 of introducing the 3rd gases at high pressure import.Remaining 34.5kg/s titanium dioxide Carbon continues to be expanded into 8.2MPa in the 3rd underground heat turbine 1043, becomes the first carbon dioxide exhaust steam.First carbon dioxide is weary Vapour enters in gas cooler 105 is cooled to 35 DEG C by surrounding medium, and the 7th flow control valve 1097 will be from gas cooler 105 The Flow-rate adjustment of 35 DEG C of carbon dioxide of discharge is 40.2kg/s.Flow enters the 3rd pressure for 40.2kg/s carbon dioxide Carbon dioxide is compressed to 10.6MPa by contracting machine 108, the 3rd compressor 108 from 8.2MPa, and the temperature of carbon dioxide rises from 35 DEG C Height is to 44.3 DEG C.The carbon dioxide that the pressure that 3rd compressor 108 is discharged is 10.6MPa, temperature is 44.3 DEG C passes through bet Enter well 1023 to enter in lower heat reservori 1013.
First regenerator 1061 is entered for 18.7kg/s carbon dioxide by the flow of second flow regulating valve 1092 After carbon dioxide exhaust steam heat exchange in high pressure fluid channel, with the low pressure fluid passage of the first regenerator 1061, temperature is increased to 112.3℃.Temperature is the same pressure of equality of temperature that 112.3 DEG C of carbon dioxide and the flow of the middle output of withdrawal well 1032 are 5.6kg/s Enter the high-pressure spray of the second regenerator 1062 after carbon dioxide (carbon dioxide attracted from the second underground heat turbine 1042) mixing Body passage, and with the low pressure fluid passage of the second regenerator 1062 the second carbon dioxide exhaust steam heat exchange after, temperature is increased to 158.3℃.Temperature is the same pressure of equality of temperature that 158.3 DEG C of carbon dioxide and the flow of the lower output of withdrawal well 1033 are 5.7kg/s Enter the high-pressure spray of the 3rd regenerator 1063 after carbon dioxide (carbon dioxide attracted from the 3rd underground heat turbine 1043) mixing Body passage, and with the low pressure fluid passage of the 3rd regenerator 1063 carbon dioxide exhaust steam heat exchange after, temperature is increased to 518.5 ℃。
Temperature enters in solar receiver 1071 for 518.5 DEG C of carbon dioxide, absorbs temperature after solar energy and is increased to 600 DEG C, the carbon dioxide with acting ability as high temperature, high pressure.Advantageously, solar receiver 1071 can be tower Solar receiver.
Temperature for 600 DEG C carbon dioxide enter solar energy turbine 1072 in expansion work, obtain temperature for 548.2 DEG C, Pressure is 8.2MPa high temperature the second carbon dioxide exhaust steam.High temperature the second carbon dioxide exhaust steam sequentially enters the 3rd regenerator 1063rd, in the low pressure fluid passage of the second regenerator 1062 and the first regenerator 1061, and the dioxy into high pressure fluid channel Change carbon heat release, temperature reduction.Flow from the first regenerator 1061 for 30kg/s the second carbon dioxide exhaust steam with from the Enter after the first carbon dioxide exhaust steam mixing of one underground heat turbine 1041, the second underground heat turbine 1042 and the 3rd underground heat turbine 1043 Gas cooler 105 is cooled.
The system for geothermal production of electricity aided in solar energy, due to the addition of solar energy, relative to this duty cycle of former base, mixing The runnability of system and net output can increase.But, nobody to the net output of hybrid system and solar energy system and The net output sum of base load system is compared.Because it is, in general, that the net output of hybrid system can be less than solar energy system The net output sum of system and base load system.
For 400 DEG C -600 DEG C of solar energy maximum heating temperature, underground heat and solar combined power generating system 10 it is net defeated Go out the net output sum higher than the system for geothermal production of electricity and the solar heat power generation system, i.e. underground heat and solar combined power generating system System 10 not only solves the key technical problem of HTHP compression, while also improving the net output of system.
It is making that the net output of underground heat and solar combined power generating system 10 improves main reason is that:
(1) the basic fluid and fluid replacement using the carbon dioxide of at least three layers heat reservori output as solar energy system, So that at least the fluid of three-level regenerator mesohigh side is matched well with the thermal capacitance of the fluid of low-pressure side, heat transfer is reduced The temperature difference.By taking 400 DEG C of final heating-up temperatures of solar energy as an example, working fluid passes through after three-level backheat, and temperature has been increased to 326 DEG C, and solar energy turbine 1072 outlet exhaust steam temperature be 353 DEG C, i.e., solar energy turbine 1072 produce exhaust steam used heat quilt On high-tension side working fluid is fully absorbed.In solar receiver 1071, the temperature rise of working fluid only has 73 DEG C, i.e., fully sharp With the high-grade characteristic of solar energy, therefore the available egress time of the solar heat power generation system is greatly improved.
Inventor is simulated calculating to the Temperature Distribution in three-level regenerator.In the calculation, it is assumed that the first regenerator 1061st, the second regenerator 1062 and the 3rd regenerator 1063 are adverse current double pipe heat exchanger, and high temperature exhaust steam is walked in pipe, and low temperature is high Pressure working fluid is walked outside pipe.Intraductal heat exchange coefficient uses Dang Empirical Equation, under the conditions of the outer carbon dioxide of pipe is heated The coefficient of heat transfer uses Jackson Empirical Equation.First regenerator 1061, the second regenerator 1062 and the 3rd regenerator 1063 Sleeve pipe in outer fluid thermal capacitance matching it is very good so that being conducted heat under the temperature difference such as approximate, therefore considerably reduce heat transfer Irreversible loss, so as to drastically increase the utilization rate of heat.
(2) because the solar heat power generation system of underground heat and solar combined power generating system 10 need not set compressor, Therefore the work(of compressor consumption is reduced.With 400 DEG C of operating temperature and solar heat power generation system setting three-stage blower Exemplified by, total wasted work amount of the three-stage blower of the solar heat power generation system is 0.612MW, accounts for the output of solar energy turbine 1072 The 40% of work((1.527MW).In mixing circulation, the heating to carbon dioxide and boosting using enhanced geothermal system, Instead of compressor, without work done during compression expenditure so that the net output of the solar heat power generation system greatly increases (1.5748MW), If, can be multiple and the carbon dioxide that the enhanced geothermal system for being used for solar energy circulation is produced carries out individually hot power generation cycle The work(gone out only 0.472MW, i.e., be used for obtainable income in solar heat power generation system bigger by enhanced geothermal fluid.
EGS electricity generation systems by working medium of carbon dioxide not only have advantage in terms of systematic function, but also can obtain The added benefit that carbon dioxide is buried.Due to EGS development cost under the present art still higher, therefore titanium dioxide Carbon-EGS electricity generation systems preferably undertake basic electricity load, and peak load can be replaced with other energy.The ground enriched in geothermal energy Area, in general solar energy is also very abundant, therefore available solar energy undertakes peak value power load.
The present invention proposes the EGS hybrid power systems of a solar energy auxiliary, wherein undertaking base by carbon dioxide-EGS This power load, and solar energy auxiliary EGS hybrid power systems undertake peak value power load.Underground heat and solar combined power generating system System 10 reduces the running parameter using carbon dioxide as the solar heat power generation system of working medium, and without the compression of high temperature high voltage resistant Machine, makes system be more easy to realization.Moreover, the net output of underground heat and solar combined power generating system 10 be more than the system for geothermal production of electricity and The net output sum of the solar heat power generation system.That is, underground heat and solar combined power generating system 10 are not only reduced Requirement to system hardware, and the net output of system can be improved.
The reason for underground heat and solar combined power generating system 10 are achieved and have preferable runnability is as follows:
1st, the physical property feature of carbon dioxide is made full use of:Carbon dioxide has greatly not in injection well and withdrawal well Midst density Together, buoyancy lift is produced, it is final to cause carbon dioxide to be more than the injection pressure in injection well, i.e., two in the well head pressure of withdrawal well During injection output of the carbonoxide in heat reservori, heat reservori had both had the effect of thermal source, it may have the effect of pump, so that After the two is coupled, the bled steam compressor of the high temperature high voltage resistant required for solar energy system is all eliminated.Meanwhile, routine is too The huge heat reservoir needed in positive energy heat generating system no longer needs.
2nd, the proposition for the concept that multilayer is excited:Multilayer (at least three layers), which is excited, will reduce drilling cost, and make heat reservori Heat is developed as far as possible, and multilayer, which is excited, can produce the carbon dioxide of different temperatures grade, can meet solar energy system The optimization of system needs.
3rd, the number of plies is coupled with solar energy and depends on the outlet temperature of solar receiver 1071, the solar heat power generation system Heat absorption pressure and solar energy turbine 1072 outlet pressure, it is ensured that in the heat absorption pressure and the sun of the solar heat power generation system The corresponding specific heat capacity of outlet pressure of energy turbine 1072 is differed to be obtained preferably within the scope of larger temperature by the supplement of flow It is thermally matched.
Solar energy is combined by underground heat and solar combined power generating system 10 with EGS, and the Optimum utilization of the two can be achieved, has Beneficial to matching for generated energy and power load.In peak times of power consumption, the high-pressure carbon dioxide part from withdrawal well is directly entered Enter the acting of underground heat turbine, another part is further heated to height after then being preheated by regenerator into solar receiver 1071 Temperature, does work subsequently into solar energy turbine 1072, can thus accomplish export EGS using solar energy in peak times of power consumption CO2 upgrades and multi output work(.And at power load relatively low night, changeable is merely with geothermal carbon dioxide Drivingly EGS generating operating modes of hot turbine power generation.
Moreover, being combined with EGS with advanced solar energy thermal-power-generating technology, the solar heat power generation system is significantly reduced Operating pressure (being reduced to from 21MPa less than 15MPa), the security of system operation is improved, the design difficulty of equipment, Materials are reduced.
In addition, the net output of the underground heat and solar combined power generating system 10 by Optimized Matching is higher than the geothermal power generation system The sum of the net output of system and the solar heat power generation system.Peak value electricity is provided by the solar heat power generation system, so as to EGS excessive exploitation is avoided, its service life can be extended.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicate or imply that the device or element of meaning must There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc. Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally;Can be that machinery connects Connect or electrically connect or can communicate each other;Can be joined directly together, can also be indirectly connected to by intermediary, can be with It is connection or the interaction relationship of two elements of two element internals, unless otherwise clear and definite restriction.For this area For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature It is that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changed, replacing and modification.

Claims (12)

1. a kind of underground heat and solar combined power generating system, it is characterised in that including:
At least three heat reservoris, at least three heat reservori is set at interval along the vertical direction;
At least three injection wells and at least three withdrawal wells, the gas outlet of at least three injection well and described at least three heat Reservoir is connected to inject carbon dioxide at least three heat reservori correspondingly, and at least three withdrawal well enters Gas port is connected to export carbon dioxide correspondingly with least three heat reservori;
At least three underground heat turbines, the air inlet of at least three underground heat turbine correspondingly with least three output The gas outlet connection of well;
Gas cooler, the air inlet of the gas cooler is connected with the first gas outlet of at least three underground heat turbine, The gas outlet of the gas cooler is connected with the air inlet of at least three injection well;
In first regenerator and the second regenerator, the gases at high pressure import of first regenerator and at least three withdrawal well The gas outlet of one positioned at the top connect, the low pressure. gas outlet of first regenerator connects with the gas cooler It is logical, the gases at high pressure import of second regenerator and second gas outlet of one at least three underground heat turbine and institute State the gases at high pressure outlet of the first regenerator, the low pressure. gas outlet of second regenerator and first regenerator Low-pressure gas inlet communication, wherein one air inlet and described at least three productions at least three underground heat turbine The gas outlet connection of the withdrawal well in addition to positioned at one of the top gone out in well;
Solar receiver, the gases at high pressure outlet of the air inlet of the solar receiver and second regenerator; With
Solar energy turbine, the air inlet of the solar energy turbine is connected with the gas outlet of the solar receiver, the sun The gas outlet of energy turbine and the low-pressure gas inlet communication of second regenerator.
2. underground heat according to claim 1 and solar combined power generating system, it is characterised in that further comprise at least three Individual compressor, the air inlet of at least three compressor is connected with the gas outlet of the gas cooler, and described at least three Air inlet of the gas outlet of compressor correspondingly with least three injection well is connected.
3. underground heat according to claim 1 or 2 and solar combined power generating system, it is characterised in that described at least three Injection well include upper injection well, middle injection well and lower injection well, at least three withdrawal well include at least one on withdrawal well, Withdrawal well and at least one lower withdrawal well at least one, at least three heat reservori include the outlet with the upper injection well The gas outlet and the middle withdrawal well of the connected upper heat reservori of the air inlet of mouth and the upper withdrawal well and the middle injection well Under the middle heat reservori that air inlet is connected and the gas outlet with the lower injection well and the air inlet of the lower withdrawal well are connected Heat reservori,
At least three underground heat turbine includes the first underground heat turbine, the second underground heat turbine and the 3rd underground heat turbine, described first The air inlet of underground heat turbine is connected with the gas outlet of the upper withdrawal well, the air inlet of the second underground heat turbine and the middle production Go out the gas outlet connection of well, the air inlet of the 3rd underground heat turbine is connected with the gas outlet of the upper withdrawal well.
4. underground heat according to claim 3 and solar combined power generating system, it is characterised in that the first underground heat turbine Air inlet connected by first flow regulating valve with the gas outlet of the upper withdrawal well, the gases at high pressure of first regenerator Import is connected by second flow regulating valve with the gas outlet of the upper withdrawal well.
5. underground heat according to claim 3 and solar combined power generating system, it is characterised in that second regenerator Gases at high pressure import is connected with the second gas outlet of the second underground heat turbine, and underground heat and the solar combined power generating system is entered One step includes:
3rd regenerator, the gases at high pressure import of the 3rd regenerator and the second gas outlet of the 3rd underground heat turbine and institute State the gases at high pressure outlet of the second regenerator, gases at high pressure outlet and the solar receiver of the 3rd regenerator Air inlet connection, the low-pressure gas import of the 3rd regenerator connects with the gas outlet of the solar energy turbine, described the The low-pressure gas inlet communication of the low pressure. gas outlet of three regenerators and second regenerator.
6. underground heat according to claim 5 and solar combined power generating system, it is characterised in that the second underground heat turbine The second gas outlet pass through the gases at high pressure inlet communication of the 3rd flow control valve and second regenerator, the 3rd underground heat Second gas outlet of turbine passes through the 4th flow control valve and the gases at high pressure inlet communication of the 3rd regenerator.
7. a kind of underground heat implemented using underground heat according to claim 1 and solar combined power generating system and solar united Close electricity-generating method, it is characterised in that comprise the following steps:
At least three heat reservori is provided;
Carbon dioxide is injected at least three heat reservori by least three injection well correspondingly, with facility Carbon dioxide is heated with least three heat reservori;
Heated titanium dioxide is conveyed at least three underground heat turbine by least three withdrawal well correspondingly Carbon, carbon dioxide at least three underground heat turbine expansion work to produce electric energy and the first carbon dioxide exhaust steam;
The first carbon dioxide exhaust steam is cooled down using the gas cooler, then by least three injection well one by one First carbon dioxide is accordingly injected at least three heat reservori;With
In peak of power consumption, by one positioned at the top at least three withdrawal well by a part of heated two Carbonoxide is transported in first regenerator, and carbon dioxide is added in first regenerator by the second carbon dioxide exhaust steam Heat, when one interior carbon dioxide expanded pressure that arrives at least three underground heat turbine is equal to described at least three productions During the pressure of the carbon dioxide of the output positioned at the top gone out in well, described one at least three underground heat turbine A part for carbon dioxide in individual be transported to second regenerator and in second regenerator with from described the The heated carbon dioxide of one regenerator is heated by the second carbon dioxide exhaust steam together, and remaining carbon dioxide continues swollen Swollen acting;
Then the heated carbon dioxide in second regenerator enters in the solar receiver and absorbs the sun Can be it to reach running temperature, the carbon dioxide for finally reaching running temperature is entered in the solar energy turbine and expansion work To produce electric energy and the second carbon dioxide exhaust steam.
8. underground heat according to claim 7 and solar combined power generating method, it is characterised in that the underground heat and solar energy Combined generating system is underground heat and solar combined power generating system according to claim 2, the underground heat and solar united Electricity-generating method is closed to further comprise compressing the first carbon dioxide exhaust steam after cooling using at least three compressor To corresponding predetermined pressure, then noted correspondingly at least three heat reservori by least three injection well Enter corresponding first carbon dioxide with predetermined pressure.
9. underground heat according to claim 8 and solar combined power generating method, it is characterised in that the underground heat and solar energy Combined generating system is the underground heat and solar combined power generating system according to claim 3 or 4,
The pressure for being injected into the carbon dioxide of the middle injection well is more than the pressure for the carbon dioxide for being injected into the upper injection well And less than the pressure for the carbon dioxide for being injected into the lower injection well, the temperature for being injected into the carbon dioxide of the middle injection well is big In the carbon dioxide for being injected into the upper injection well temperature and less than be injected into the lower injection well carbon dioxide temperature, The flow for being injected into the carbon dioxide of the middle injection well is more than the flow of carbon dioxide that is injected into the upper injection well and small In the flow for the carbon dioxide for being injected into the lower injection well,
The temperature of the carbon dioxide of the middle withdrawal well output is more than the temperature of the carbon dioxide of the upper withdrawal well output and small In the temperature of the carbon dioxide of the lower withdrawal well output, the pressure of the carbon dioxide of the middle withdrawal well output is more than on described The pressure of the carbon dioxide of withdrawal well output and less than the lower withdrawal well output carbon dioxide pressure.
10. underground heat according to claim 9 and solar combined power generating method, it is characterised in that the underground heat and the sun Energy combined generating system is underground heat and solar combined power generating system according to claim 5 or 6, the underground heat and the sun Energy cogeneration method further comprises:
When the carbon dioxide expanded carbon dioxide for being equal to the upper withdrawal well output to pressure in the 3rd underground heat turbine During pressure, a part for the carbon dioxide in the 3rd underground heat turbine is transported to the 3rd regenerator and the described 3rd Heated in regenerator together with the heated carbon dioxide from second regenerator by the second carbon dioxide exhaust steam, Remaining carbon dioxide continues expansion work;With
Heated carbon dioxide in 3rd regenerator enter in the solar receiver and absorb solar energy with Just running temperature is reached.
11. underground heat according to claim 10 and solar combined power generating method, it is characterised in that first regenerator Gases at high pressure exit carbon dioxide temperature be equal to be transported to second regenerator from the second underground heat turbine The temperature of carbon dioxide, the temperature of the carbon dioxide in the gases at high pressure exit of second regenerator is equal to from the 3rd ground The temperature of the flat carbon dioxide for being transported to the 3rd regenerator of heat penetration.
12. underground heat according to claim 7 and solar combined power generating method, it is characterised in that the solar energy turbine First carbon dioxide that the pressure of the second carbon dioxide exhaust steam produced is equal to each underground heat turbine generation is weary The pressure of vapour.
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