CN101178018A - Method and device for power generation by employing multiple dispersed residual heat sources and various residual heat carrier medium - Google Patents

Method and device for power generation by employing multiple dispersed residual heat sources and various residual heat carrier medium Download PDF

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Publication number
CN101178018A
CN101178018A CN 200710050627 CN200710050627A CN101178018A CN 101178018 A CN101178018 A CN 101178018A CN 200710050627 CN200710050627 CN 200710050627 CN 200710050627 A CN200710050627 A CN 200710050627A CN 101178018 A CN101178018 A CN 101178018A
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CN
China
Prior art keywords
heat exchanger
working medium
sub
waste heat
communicated
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Pending
Application number
CN 200710050627
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Chinese (zh)
Inventor
谢永慧
谈芦益
张荻
孔祥林
王建录
商宇
潘家成
孙奇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Jiaotong University
DEC Dongfang Turbine Co Ltd
Original Assignee
Xian Jiaotong University
DEC Dongfang Turbine Co Ltd
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Filing date
Publication date
Application filed by Xian Jiaotong University, DEC Dongfang Turbine Co Ltd filed Critical Xian Jiaotong University
Priority to CN 200710050627 priority Critical patent/CN101178018A/en
Publication of CN101178018A publication Critical patent/CN101178018A/en
Pending legal-status Critical Current

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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
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/16Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y02E20/18Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]

Abstract

The invention discloses a method of making use of a plurality of dispersed waste heat sources and various waste heat vector mediums for generating. A waste heat generating system is arranged and the system is provided with a plurality of subsystems at the same row; the number of the subsystems is same as that of the dispersed waste heat sources. Each subsystem has a closed circuit cycle device comprising a working fluid condenser, a pump, a waste heat exchanger and a turbine that are connected through pipes in sequence and a motor connected with the turbine; the working fluid to each subsystem is matching with the waste heat vector medium of the subsystem. All subsystems are divided into groups with two in each group and each group has a high temperature subsystem and a low temperature subsystem; the liquid phase working fluid of the low temperature subsystem exchanges heat with the vapor phase working fluid of the high temperature subsystem which has done work and then is sent to the waste heat exchanger of the low temperature subsystem to be vaporized after being preheated; or the liquid phase working fluid of both the high and the low temperature subsystems respectively exchange heat with the vapor phase working fluid of the high temperature subsystem which has done work and then are sent to each waste heat exchanger to be vaporized after being preheated.

Description

Utilize the method and the device of a plurality of dispersion waste heat thermals source, the generating of multiple waste heat mounting medium
Technical field
The present invention relates to cogeneration technology, relate in particular to and a kind ofly utilize that distribution is wide, the thermal power total amount is bigger but single thermal power is less and the waste heat mounting medium is the method and the device of multifarious waste heat heat resource power generation.
Background technique
China is a production of energy and consumption big country, and the production of energy amount is only second to the U.S. and Russia, occupies the third place in the world; Primary energy consumption accounts for 1/10 of world's aggregate consumption, is only second to the U.S., occupies the second place of the world.But China's energy utilization rate is not high, and some developed country's energy utilization rates are all more than 50%, and the energy utilization rate of the U.S. surpasses 60%, and China has only about 30%.According to statistics, the energy consumption intensity of China in 2003 is 6.9 times of Japan, 4.3 times of Germany, and 3.3 times of the U.S. are higher than the energy consumption intensity of world developed country far away.According to investigation, the waste heat total resources of every profession and trade account for 17%~67% of its fuel consumption total amount, and the residual heat resources of recyclable utilization are about 60% of waste heat total resources.Therefore, UTILIZATION OF VESIDUAL HEAT IN is carried out deep research, for energy saving, improve energy utilization rate, set up rational energy framework, preserving the ecological environment has very important meaning.
Just the bigger concentrated waste heat of large industrial enterprise thermal power is used at present, and a large amount of dispersion waste heats less to thermal power (various life waste heats, as vehicle exhaust, engine cooling water etc.) do not utilize as yet, in fact, various small-powers disperse the total amount of waste heat to be far longer than high-power concentrated waste heat, and therefore, the research and development small-power is disperseed the heat recovery technology, becoming current vital task, is one of key link of building a conservation-minded society.
Be limited to above-mentioned UTILIZATION OF VESIDUAL HEAT IN situation, mostly existing device for generating power by waste heat is large sized complete sets of equipment, only is applicable to a certain concrete waste heat mounting medium, and it is equipped with working medium also is specific, can not utilize the heat generating of several waste heat mounting mediums simultaneously.Especially, because of device is an isolated system, the vapour phase working medium after the acting (being the turbo machine steam discharge) temperature is still higher, contains a lot of heats, and UTILIZATION OF VESIDUAL HEAT IN is insufficient, and its condensation must be consumed energy in addition, and is less economical.
Summary of the invention
Purpose of the present invention provides a kind of method and device that makes full use of a plurality of dispersion waste heat thermals source, the generating of multiple waste heat mounting medium.
Technical solution of the present invention is:
A kind of method of utilizing a plurality of dispersion waste heat thermals source, the generating of multiple waste heat mounting medium is provided with an afterheat generating system, and this system has a plurality of subtense angles arranged side by side, and the quantity of subtense angle is identical with the quantity of disperseing the waste heat thermal source; Each subtense angle has a closed-circuit device that is linked in sequence and constitutes by pipeline by working medium condenser, pump, afterheat heat exchanger, turbo machine, a generator that is connected with turbo machine; Drive the working medium circulation by pump, provide vaporization energy by afterheat heat exchanger to working medium by the waste heat mounting medium, expanding to do work by vapour phase working medium drives the turbo machine rotation, drives generator for electricity generation by turbo machine, and the vapour phase working medium after will being done work by condenser is condensed into liquid phase; The heat-exchange working medium of each subsystem configures, suitable with the waste heat mounting medium of this subtense angle, the dew point of working medium is lower than this subtense angle waste heat mounting medium temperature.
With the vapour phase working medium heat exchange after described liquid phase working fluid and the acting, send into the afterheat heat exchanger vaporization after the preheating again.
All subtense angles are divided into one group in twos, and each group has a high temperature subtense angle and a low temperature subtense angle, with the liquid phase working fluid of low temperature subtense angle and the vapour phase working medium heat exchange after the acting of high temperature subtense angle, sends into the afterheat heat exchanger vaporization of low temperature subtense angle after the preheating again; Or with the liquid phase working fluid of high and low temperature subtense angle all with the acting of high temperature subtense angle after the heat exchange respectively of vapour phase working medium, send into afterheat heat exchanger vaporization separately after the preheating again.
The electric energy that all subtense angles send is incorporated into the power networks after frequency modulation, the pressure regulation respectively, gives consumer and uses, or send into accumulators store after the rectification.
Described waste heat mounting medium is various gas phases, liquid phase medium, as the steam of various materials, hot air, hot water etc., or flowable Powdered solid-phase media, as clinker, foundry sand etc.; Described working medium is various liquid phase mediums, as water, freon, ammonia, various alkanes working medium and other organic working medium.
The device that is used for said method comprises a plurality of sub-devices arranged side by side, and the quantity of sub-device is identical with the quantity of disperseing the waste heat thermal source; Described sub-device has afterheat heat exchanger, working medium condenser, pump, turbo machine, generator; Described afterheat heat exchanger has waste heat mounting medium inlet/outlet, working medium inlet/outlet; The import of described pump is communicated with the outlet of working medium condenser, and delivery side of pump is communicated with the working medium import of afterheat heat exchanger; The sender property outlet of described afterheat heat exchanger is communicated with the import of turbo machine; The outlet of described turbo machine is communicated with the import of working medium condenser; The output shaft of turbo machine connects the input shaft of generator.The heat-exchange working medium of each sub-device configuration, suitable with the waste heat mounting medium of this sub-device.
A kind of improvement project of this device is: between turbo machine and working medium condenser, also be in series with Recuperative heat exchanger, the vapour phase working medium import of this Recuperative heat exchanger is communicated with the outlet of turbo machine, and the vapour phase sender property outlet is communicated with the import of working medium condenser; The liquid phase working fluid import of Recuperative heat exchanger is communicated with delivery side of pump, and the liquid phase working fluid outlet is communicated with the working medium import of afterheat heat exchanger.
The another kind of improvement project of this device is: all sub-devices are divided into one group in twos, and every group has sub-device of a high temperature and the sub-device of a low temperature; The Recuperative heat exchanger of between the turbo machine of the sub-device of high temperature and working medium condenser, connecting, the liquid phase working fluid import of this Recuperative heat exchanger is communicated with the sub-device delivery side of pump of low temperature, and the liquid phase working fluid outlet is communicated with the working medium import of the sub-device by utilizing waste heat heat exchanger of low temperature.
The further improvement of above-mentioned improvement project is: two Recuperative heat exchangers of connecting between the turbo machine of the sub-device of high temperature and working medium condenser, the liquid phase working fluid import of one of them Recuperative heat exchanger is communicated with the sub-device delivery side of pump of low temperature, and the liquid phase working fluid outlet is communicated with the working medium import of the sub-device by utilizing waste heat heat exchanger of low temperature; The liquid phase working fluid import of another Recuperative heat exchanger is communicated with the sub-device delivery side of pump of high temperature, and the liquid phase working fluid outlet is communicated with the working medium import of the sub-device by utilizing waste heat heat exchanger of high temperature.
In this improvement project: under suitable operating mode, the condenser in high temperature and the sub-device of low temperature is all replaced with the vapour-liquid mixer, and reserved part liquid phase working fluid wherein, the vapour phase working medium in two sub-devices directly enters condensation in the vapour-liquid mixer.Simultaneously delivery side of pump in the low temperature subcycle is communicated with vapour-liquid mixer (or the condenser in the aforementioned schemes) liquid phase import in the high temperature subcycle, the working medium in the sub-device of the higher relatively high temperature of condensing temperature is cooled off.All the other required condensation effects can be realized by air cooling, water-cooled or other condensing modes in the system.
Useful technique effect of the present invention is:
One. can be to some distributions are wide, the thermal power total amount is bigger but the waste heat thermal source that single thermal power is less utilize;
Two. can realize device miniaturization, to arrive the distributed energy utilization;
Three. can use different working medium to carry out work in combination, to obtain the optimum efficiency of system under the different operating modes;
Four. can utilize originally and can only reduce the waste heat exhaust temperature as the energy of used heat discharge, less thermo-pollution improves the electricity generating device whole efficiency;
Five. each subtense angle has independence preferably, and total system has stability preferably.
Description of drawings
Fig. 1 is the structured flowchart of this device
Fig. 2 is the structural drawing of sub-device grouping example one
Fig. 3 is the structural drawing of sub-device grouping example two
Fig. 4 is the structural drawing of sub-device grouping example three
Fig. 5 is the structural drawing of sub-device grouping example four
Fig. 6 is the structural drawing of sub-device grouping example five
Fig. 7 is the structural drawing of sub-device grouping example six
Embodiment
Referring to Fig. 1: this afterheat generating system has a plurality of subtense angles arranged side by side (1,2,3,4 ... n), the quantity of subtense angle is identical with the quantity of disperseing the waste heat thermal source; The heat-exchange working medium of each subsystem configures, suitable with the waste heat mounting medium of this subtense angle, the dew point of working medium is lower than this subtense angle waste heat mounting medium temperature, and working medium comprises organic working medium such as freon, alkanes and inorganic working medium such as water, ammonia etc.The electric energy that subtense angle sends is incorporated into the power networks after frequency modulation, the pressure regulation respectively, gives consumer and uses, or send into accumulators store after the rectification.Each subtense angle can independent operating, also can be divided into one group in twos, each group has a high temperature subtense angle and a low temperature subtense angle, with the liquid phase working fluid of low temperature subtense angle and the vapour phase working medium heat exchange after the acting of high temperature subtense angle, sends into the afterheat heat exchanger vaporization of low temperature subtense angle after the preheating again; Or with the liquid phase working fluid of high and low temperature subtense angle all with the acting of high temperature subtense angle after the heat exchange respectively of vapour phase working medium, send into afterheat heat exchanger vaporization separately after the preheating again.
Be several configuration structure examples and the working procedure thereof after the subtense angle grouping below, division is as follows.
Example one
As shown in Figure 2: for high temperature subcycle system, working medium is extracted out by being pressurized pump 10 in the vapour-liquid mixer 9, be delivered to high-temperature residual heat heat exchanger 1, heating and gasifying is laggard goes in the miniature high speed turbine 2, expand and do work, promote turbo machine 2 and rotate, rotate generating thereby drive the miniature high-speed motor 3 that links to each other with miniature high-speed turbo machine 2.The working medium acting finishes the back by discharging in the turbo machine 2, enters the 9 direct condensations of vapour-liquid mixer, enters circulation next time then.The vapour-liquid mixer can be determined the type of cooling according to actual conditions, can be air cooling, water-cooled or other condensing modes; Low temperature subcycle system, working medium is extracted out by being pressurized pump 8 in the vapour-liquid mixer 7, through the vapour-liquid mixer 9 in the high temperature subcycle, be delivered to low temperature exhaust heat heat exchanger 4 then, heating and gasifying is laggard goes in the miniature high speed turbine 5, the expansion acting promotes turbo machine 5 and rotates, thereby drives the miniature high-speed motor 6 rotation generatings that link to each other with miniature high-speed turbo machine 5.The working medium acting finishes the back by discharging in the turbo machine 5, enters the 7 direct condensations of vapour-liquid mixer, enters circulation next time then.The vapour-liquid mixer can be determined the type of cooling according to actual conditions, can be air cooling, water-cooled or other condensing modes.
Example two
As shown in Figure 3: this systemic circulation working method and Fig. 2 are basic identical, difference is to have added the backheat heat exchange structure in high temperature, the low temperature subcycle, liquid refrigerant is therein by the gas turbine exhaust preheating, be specially: for the high temperature subcycle, exhaust in the miniature high-speed turbo machine 2 will enter vapour-liquid mixer 11 after will being introduced into Recuperative heat exchanger 4, the working medium condensation is after suction booster 12 enters Recuperative heat exchanger 4 again, enters high-temperature residual heat heat exchanger 1 after being deflated preheating; For the low temperature subcycle, exhaust in the miniature high-speed turbo machine 6 will enter vapour-liquid mixer 9 after will being introduced into Recuperative heat exchanger 8, the working medium condensation enters then and is delivered to low temperature exhaust heat heat exchanger 5 after Recuperative heat exchanger 8 is deflated preheating after suction booster 10 enters vapour-liquid mixer 11 again.
Example three
As shown in Figure 4: this system operating mode and Fig. 3 are basic identical, difference is to have added intermediate heat exchanger in the high temperature subcycle, to the working medium preheating once more of coming out by regenerator in the low temperature subcycle, be specially: for high temperature circulation, exhaust in the miniature high-speed turbo machine 2 enters intermediate heat exchanger 4, enter Recuperative heat exchanger 11 then, enter vapour-liquid mixer 12 again, condensation enters high-temperature residual heat heat exchanger 1 after suction booster 13 enters after Recuperative heat exchanger 11 is deflated preheating again; For the low temperature circulation, the exhaust in the miniature high-speed turbo machine 6 enters Recuperative heat exchanger 8, enters vapour-liquid mixer 9 again, condensation is after suction booster 10 enters vapour-liquid mixer 12, enter Recuperative heat exchanger 8 then, enter intermediate heat exchanger 4 after being deflated preheating, enter low temperature exhaust heat heat exchanger 5 again.
Example four
As shown in Figure 5: this structure and Fig. 2 structure are basic identical, and difference is to have replaced the vapour-liquid mixer 9 among Fig. 2 with condensing heat exchanger 10 and liquid container 11, has replaced the vapour-liquid mixer 7 among Fig. 2 with condensing heat exchanger 7 and liquid container 8.
Example five
As shown in Figure 6: this structure and Fig. 3 structure are basic identical, and difference is to have replaced the vapour-liquid mixer 11 among Fig. 3 with condensing heat exchanger 12 and liquid container 13, has replaced the vapour-liquid mixer 9 among Fig. 3 with condensing heat exchanger 9 and liquid container 10.
Example six
As shown in Figure 7: this structure and Fig. 4 structure are basic identical, and difference is to have replaced the vapour-liquid mixer 12 among Fig. 4 with condensing heat exchanger 13 and liquid container 14, has replaced the vapour-liquid mixer 9 among Fig. 4 with condensing heat exchanger 9 and liquid container 10.
By above-mentioned example as can be seen, the present invention has following advantage:
The subcycle system can decide the part-structure in the system according to the characteristics of actual waste heat thermal source and selected cycle fluid, promptly determine the collocation of vapour-liquid mixer, Recuperative heat exchanger, condensing heat exchanger and liquid container or use separately, to reach best energy utilization.The vapour-liquid mixer and the condensing heat exchanger main distinction are to use condensing heat exchanger that working medium is not had specific (special) requirements, and need be in condensing heat exchanger the reserved part liquid refrigerant.
Miniature high-speed turbo machine and miniature high-speed rotating speed of motor are very high, thereby its volume, weight are less relatively, and hour adopt partial admission with adaptation condition at working medium flow, the feasibility that guarantees simultaneously to make.
Intermediate heat exchanger or vapour-liquid mixer have been adopted between two sub-circulatory systems, with two independently system link up, will be in high temperature subcycle system original unserviceable used heat is used for heating the working medium in the low temperature subcycle system, has improved the system capacity utilization ratio.
Adopted the backheat structure in the part-structure, promptly with the exhaust of miniature high-speed turbo machine to carrying out preheating by the working medium of exporting in the suction booster, the heat loss when having reduced the working medium condensation, and improved the system capacity utilization ratio.
Can adopt the vapour-liquid mixer in system's neutron circulatory system during the part specific operation, will drop into minimizing equipment through the miniature high-speed gas turbine exhaust direct liquefaction behind the Recuperative heat exchanger.Simultaneously, when operating mode was suitable, liberated heat can be by absorbing by the working medium in the low temperature subcycle of vapour-liquid mixer when working medium liquefied condensation in the high temperature subcycle system, and the energy utilization is more abundant.
Can select for use different working medium to arrange in pairs or groups, to adapt to waste heat thermal source with different characteristics.Be linked together by intermediate heat exchanger or vapour-liquid mixer or condenser between two sub-circulatory systems of high temperature and low temperature in the system, but the working medium in two subtense angles separates, have only energy interchange and do not have mass exchange, therefore can adopt suitable working medium at different waste heat heat sources, comprise organic working medium such as freon, alkanes and inorganic working medium such as water, ammonia etc.

Claims (7)

1. a method of utilizing a plurality of dispersion waste heat thermals source, the generating of multiple waste heat mounting medium is provided with an afterheat generating system, and this system has a plurality of subtense angles arranged side by side, and the quantity of subtense angle is identical with the quantity of disperseing the waste heat thermal source; Each subtense angle has a closed-circuit device that is linked in sequence and constitutes by pipeline by working medium condenser, pump, afterheat heat exchanger and turbo machine, a generator that is connected with turbo machine; Drive the working medium circulation by pump, provide vaporization energy by afterheat heat exchanger to working medium by the waste heat mounting medium, expanding to do work by vapour phase working medium drives the turbo machine rotation, drives generator for electricity generation by turbo machine, and the vapour phase working medium after will being done work by condenser is condensed into liquid phase; The heat-exchange working medium of each subsystem configures, suitable with the waste heat mounting medium of this subtense angle.
2. method according to claim 1 is characterized in that: with the vapour phase working medium heat exchange after described liquid phase working fluid and the acting, send into the afterheat heat exchanger vaporization after the preheating again.
3. method according to claim 1 is characterized in that: all subtense angles are divided into one group in twos, and each group has a high temperature subtense angle and a low temperature subtense angle; With the liquid phase working fluid of low temperature subtense angle and the vapour phase working medium heat exchange after the acting of high temperature subtense angle, send into the afterheat heat exchanger vaporization of low temperature subtense angle after the preheating again; Or with the liquid phase working fluid of high and low temperature subtense angle all with the acting of high temperature subtense angle after the heat exchange respectively of vapour phase working medium, send into afterheat heat exchanger vaporization separately after the preheating again.
4. a device that utilizes a plurality of dispersion waste heat thermals source, the generating of multiple waste heat mounting medium comprises a plurality of sub-devices arranged side by side, and the quantity of sub-device is identical with the quantity of disperseing the waste heat thermal source; Described sub-device has afterheat heat exchanger, working medium condenser, pump, turbo machine and generator; Described afterheat heat exchanger has waste heat mounting medium inlet/outlet, working medium inlet/outlet; The import of described pump is communicated with the outlet of working medium condenser, and delivery side of pump is communicated with the working medium import of afterheat heat exchanger; The sender property outlet of described afterheat heat exchanger is communicated with the import of turbo machine, and the outlet of described turbo machine is communicated with the import of working medium condenser; The output shaft of described turbo machine connects the input shaft of generator; The heat-exchange working medium of each sub-device configuration, suitable with the waste heat mounting medium of this sub-device.
5. device according to claim 4 is characterized in that: between turbo machine and working medium condenser, also be in series with Recuperative heat exchanger, the vapour phase working medium import of this Recuperative heat exchanger is communicated with the outlet of turbo machine, and the vapour phase sender property outlet is communicated with the import of working medium condenser; The liquid phase working fluid import of Recuperative heat exchanger is communicated with delivery side of pump, and the liquid phase working fluid outlet is communicated with the working medium import of afterheat heat exchanger.
6. device according to claim 4 is characterized in that: all sub-devices are divided into one group in twos, and every group has sub-device of a high temperature and the sub-device of a low temperature; The Recuperative heat exchanger of between the turbo machine of the sub-device of high temperature and working medium condenser, connecting, the liquid phase working fluid import of this Recuperative heat exchanger is communicated with the sub-device delivery side of pump of low temperature, and the liquid phase working fluid outlet is communicated with the working medium import of the sub-device by utilizing waste heat heat exchanger of low temperature.
7. device according to claim 6, it is characterized in that: two Recuperative heat exchangers of between the turbo machine of the sub-device of high temperature and working medium condenser, connecting, the liquid phase working fluid import of one of them Recuperative heat exchanger is communicated with the sub-device delivery side of pump of low temperature, and the liquid phase working fluid outlet is communicated with the working medium import of the sub-device by utilizing waste heat heat exchanger of low temperature; The liquid phase working fluid import of another Recuperative heat exchanger is communicated with the sub-device delivery side of pump of high temperature, and the liquid phase working fluid outlet is communicated with the working medium import of the sub-device by utilizing waste heat heat exchanger of high temperature.
CN 200710050627 2007-11-22 2007-11-22 Method and device for power generation by employing multiple dispersed residual heat sources and various residual heat carrier medium Pending CN101178018A (en)

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Application Number Priority Date Filing Date Title
CN 200710050627 CN101178018A (en) 2007-11-22 2007-11-22 Method and device for power generation by employing multiple dispersed residual heat sources and various residual heat carrier medium

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102251911A (en) * 2011-05-26 2011-11-23 西安交通大学 Solar vacuumizing hydraulic electrogenerating system, and operation method thereof
CN103174612A (en) * 2011-12-22 2013-06-26 深圳市阳能科技有限公司 Solar energy heat exchange and power generation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102251911A (en) * 2011-05-26 2011-11-23 西安交通大学 Solar vacuumizing hydraulic electrogenerating system, and operation method thereof
CN103174612A (en) * 2011-12-22 2013-06-26 深圳市阳能科技有限公司 Solar energy heat exchange and power generation system

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