CN104047818B - Solar light-heat power-generation system and energy storage method - Google Patents
Solar light-heat power-generation system and energy storage method Download PDFInfo
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- CN104047818B CN104047818B CN201410291169.7A CN201410291169A CN104047818B CN 104047818 B CN104047818 B CN 104047818B CN 201410291169 A CN201410291169 A CN 201410291169A CN 104047818 B CN104047818 B CN 104047818B
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- 238000010248 power generation Methods 0.000 title claims abstract description 29
- 238000004146 energy storage Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009825 accumulation Methods 0.000 claims abstract description 80
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 64
- 239000002184 metal Substances 0.000 claims abstract description 62
- 229910052751 metal Inorganic materials 0.000 claims abstract description 62
- 238000005338 heat storage Methods 0.000 claims abstract description 21
- 230000005611 electricity Effects 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000009835 boiling Methods 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 239000003507 refrigerant Substances 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 210000004027 cell Anatomy 0.000 abstract description 43
- 230000004899 motility Effects 0.000 abstract description 3
- 210000005056 cell body Anatomy 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 description 55
- 230000008018 melting Effects 0.000 description 11
- 238000002844 melting Methods 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of solar light-heat power-generation system and energy storage method, it is placed on after liquid metal cell body group string in the heat accumulation working medium storage tank body of heat reservoir, using can the body of high temperature fluent metal battery of sensible heat heat accumulation as heat accumulation working medium, it is positioned in high-temperature storage tank, and add grid-connected converter and heat-exchanger rig for this liquid metal cell, electric energy and heat energy is collectively formed with storing up electricity generation system with tradition heat reservoir, save the separately installed cost of battery and heat accumulation working medium cost, moreover it is possible to increase more heat storage capacity.The heat reservoir of the present invention can be that liquid metal cell provides necessary high-temperature work environment；Electrical network electric energy is for more than taking liquid metal cell charging, and unnecessary for electrical network electric energy can be converted into thermal energy storage as heater element and get off by liquid metal cell, regulates electrical network imbalance between supply and demand.The present invention stores heat energy simultaneously and electric energy substantially increases the operational mode motility of electricity generation system, creates more operational mode, meets electrical network and power demands.
Description
Technical field
The present invention relates to a kind of solar light-heat power-generation system and energy storage method.
Background technology
Heat reservoir in existing solar light-heat power-generation system generally configures two holding vessels, deposits high temperature refrigerant and cryogenic fluid respectively.The heat energy that heat reservoir stores, derives from solar-energy light collector, enters high-temperature storage tank stand-by after cryogenic fluid is heated；When solar energy deficiency or disappearance, high temperature refrigerant can continue to provide high-temperature steam to use for generating into steam turbine；After heat exchange, the temperature of heat accumulation working medium reduces, and enters cryogenic tank wait and is reheated.This energy-storage system is based on heat accumulation, and its heat accumulation working medium can only store heat energy, it is impossible to store electric energy, and mode of operation is limited to energy storage in the daytime-night exoergic pattern, and energy can only be with electric energy pattern feed-in electrical network, it is impossible to two-way flow.
Summary of the invention
It is an object of the invention to provide a kind of heat energy that can store and can store again solar light-heat power-generation system and the energy storage method of electric energy.
This solar light-heat power-generation system that the present invention provides, including power storage system and heat reservoir；
Power storage system includes that two liquid metal cells and grid-connected converter, two liquid metal cell series connection form set of cells, and described set of cells is connected in parallel with the DC bus capacitor device of grid-connected converter, and grid-connected converter is connected with electrical network；
Being positioned over the liquid metal cell in high-temperature storage tank is high temperature fluent metal battery, and being positioned over the liquid metal cell in low temperature storage tank is low temperature liquid metal battery；
Heat reservoir includes solar energy heat trap, high-temperature storage tank, described high temperature fluent metal battery body, low temperature storage tank, steam generator, vapor wheel unit, electromotor and heat accumulation working medium；Heat accumulation working medium enters in high-temperature storage tank after being heated by solar energy heat trap, becomes cryogenic fluid and enter low temperature storage tank after release heat energy, and wait is heated again；The heat accumulation working medium of low temperature is heated again by high temperature fluent metal battery body, becomes the heat accumulation working medium of high temperature；The heat energy that the heat accumulation working medium of high temperature stores provides high temperature and high pressure steam by steam generator for steam turbine power generating, promotes vapor wheel unit and electrical power generators, and electromotor is connected with electrical network.
The battery electrode being immersed in described heat accumulation working medium of described liquid metal cell increases insulation protection, prevents described battery short circuit or electric leakage.
Described liquid metal cell uses the boiling point of battery electrode metal to be higher than the maximum operating temperature of described heat accumulation working medium and the fusing point of its battery electrode metal liquid metal cell less than the minimum operating temperature of described heat accumulation working medium；Described high temperature fluent metal battery body is with sensible heat mode heat accumulation, and this battery body is equipped with the heat-exchanger rig that the heat energy of storage inputs or exports this battery body.
Described heat accumulation working medium uses liquid refrigerant or solid-state working medium.
Described grid-connected converter uses voltage converter.
Described grid-connected converter uses the current transformer with realizing bidirectional electric energy flow, it is described high temperature fluent metal battery and the charging of low temperature liquid metal battery when electrical network electric energy is unnecessary or electricity price is relatively low, when electrical network power shortage or electricity price are higher by the electric energy feedback of storage in described high temperature fluent metal battery to electrical network.
The energy storage method of a kind of solar light-heat power-generation system, comprises the steps:
After the heat energy release that initial duty or heat reservoir store, high-temperature storage tank is empty, and high temperature fluent metal battery body has been also reduced to its minimum operating temperature, and all of heat accumulation working medium all leaves in low temperature storage tank；
Under the conditions of solar energy supply on daytime is abundant, low temperature heat accumulation working medium heats through solar energy heat trap, becomes high-temperature heat-storage working medium and is stored in high-temperature storage tank, and high-temperature heat-storage working medium is heated to the condition of high temperature high temperature fluent metal battery body simultaneously；High-temperature heat-storage working medium heat accumulation process can be carried out with vapor wheel unit generation simultaneously；
Under the conditions of night or peak of power consumption, the heat energy that heat reservoir stores starts release and is converted into electric energy to electrical network feeding through vapor wheel unit；First discharge is the heat energy of high-temperature heat-storage working medium storage, high-temperature heat-storage working medium produces high temperature and high pressure steam by steam generator and promotes vapor wheel unit to operate, after release heat energy, heat accumulation Temperature of Working reduces, and becomes low temperature heat accumulation working medium and is back to low temperature storage tank and stores；When in high-temperature storage tank, heat accumulation working medium quantity is close to zero, the heat energy stored in high temperature fluent metal battery body does not discharge, this battery keeps the condition of high temperature, again the part heat accumulation working medium in low temperature storage tank is pumped into the pipeline in this high temperature fluent metal battery body by pumping installations, low temperature heat accumulation working medium can reheat into high-temperature heat-storage working medium, and the high-temperature heat-storage working medium reheated produces high temperature and high pressure steam by steam generator and promotes vapor wheel unit generation；
Described power storage system can depart from solar-thermal generating system control, independently accepts dispatching of power netwoks and carries out discharge and recharge operation；When the electric energy that electrical network cannot receive described solar light-heat power-generation system to send, unnecessary electric energy is that described liquid metal cell charges by grid-connected converter；When the electric energy that described solar light-heat power-generation system sends can not meet electrical network power demands, the electric energy that described liquid metal cell stores is by combining inverter feed-in electrical network.
Electrical network electric energy can be changed into heat energy as heater element when illumination is not enough for a long time or heat accumulation working medium heat accumulation efficiency reduces by described high temperature fluent metal battery, stores energy for low temperature heat accumulation working medium is heated into high-temperature heat-storage working medium.
The liquid metal cell of the present invention can be used for the storage of electric energy.The present invention will be placed on inside the heat accumulation working medium storage tank body of heat reservoir after liquid metal cell body group string, also can using can the body of high temperature fluent metal battery of sensible heat heat accumulation as heat accumulation working medium, it is positioned in high-temperature storage tank, and add grid-connected converter and heat-exchanger rig for this liquid metal cell, partial heat energy also can be stored while storage electric energy, electric energy-heat energy is collectively formed with storing up electricity generation system with heat reservoir, save the separately installed cost of battery and heat accumulation working medium cost, additionally it is possible to increase more heat storage capacity.The heat reservoir of the present invention can be that liquid metal cell provides necessary high-temperature work environment；Electrical network electric energy is for more than taking liquid metal cell charging, and unnecessary for electrical network electric energy even can be converted into thermal energy storage as heater element and get off by liquid metal cell, regulates electrical network imbalance between supply and demand.The present invention stores heat energy simultaneously and electric energy substantially increases the operational mode motility of electricity generation system, creates more operational mode, meets electrical network and power demands.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the power storage system structural representation of the present invention.
Fig. 3 is the heat reservoir structural representation of the present invention.
Detailed description of the invention
As it is shown in figure 1, the present invention includes power storage system and heat reservoir.
Power storage system includes two liquid metal cells and grid-connected converter.Being positioned over the liquid metal cell in high-temperature storage tank 4 is high temperature fluent metal battery 5, and being positioned over the liquid metal cell in low temperature storage tank 2 is low temperature liquid metal battery 3.Two liquid metal cell series connection form set of cells, and this set of cells is connected in parallel with the DC bus capacitor device C of grid-connected converter 9, and grid-connected converter 9 is connected with electrical network.
Heat reservoir includes solar energy heat trap 1, high-temperature storage tank 4, low temperature storage tank 2, steam generator 6, condenser 7, vapor wheel unit 8, electromotor 10 and heat accumulation working medium.
Solar energy heat trap 1, high-temperature storage tank 4, low temperature storage tank 2 and steam generator 6 are in turn connected into one and are beneficial to the annular channels that heat accumulation Working cold-hot circulates；Low temperature storage tank 2 connects into another path for the flowing of heat accumulation working medium circulation also by heat transfer pipe via the high temperature fluent metal battery body in high-temperature storage tank 4 and steam generator 6, this steam generator 6 is connected with electromotor 10 by vapor wheel unit 8, electromotor 10 is connected with electrical network, and condenser 7 is connected to be back to the pipeline of steam generator from vapor wheel unit 8.
Heat accumulation working medium enters in high-temperature storage tank after being heated by solar energy heat trap, becomes cryogenic fluid and enter low temperature storage tank after release heat energy, and wait is heated again；The heat accumulation working medium of low temperature is heated again by high temperature fluent metal battery body, becomes the heat accumulation working medium of high temperature；The heat energy that the heat accumulation working medium of high temperature stores provides high temperature and high pressure steam by steam generator for steam turbine power generating, promotes vapor wheel unit and electrical power generators, and electromotor is connected with electrical network.
The high temperature fluent metal battery of the present invention can either store electric energy, can store heat energy simultaneously, therefore be also called electric-thermal and same can store up liquid metal cell.
Solar light-heat power-generation is to improve energy density by beam condensing unit, after heating heat transfer and heat accumulation working medium, completes the heat energy conversion to electric energy by Turbo-generator Set.Solar light-heat power-generation can provide stable electric energy to export, and undertakes electrical network foundation load, is welcome by electrical network.In order to break through the restriction that can not generate electricity night, most the most integrated heat reservoirs of solar light-heat power-generation system, configuration mode mainly has indirect heat accumulation and direct heat accumulation two kinds.The working medium of heat reservoir is many based on fused salt, and heat accumulation principle has sensible heat and latent heat (phase transformation) two ways.
Liquid metal cell is a kind of novel electric storage device, and it is by two kinds of liquid metals as electrode, and centre fused salt does electrolyte isolation positive and negative electrode, and the electrode metal different and immiscible by selection density and fused salt, inside battery self-assembling formation three layers.The operation principle of liquid metal cell is that the deposition potential of electrode metal does not waits and forms potential differences at two interpolars, and the low metal of deposition potential is as negative pole, and the high metal of deposition potential is as positive pole.Owing to the Gibbs free energy of two kinds of electrode metals is unequal, negative metal forms ionizing diffusion in charging, discharge process, moves at positive and negative interpolar, completes charge and discharge process.The advantage of liquid metal cell is can to reduce energy-storage system cost and operating cost with the low metal electrode material of alternative costs, in have application advantage in terms of extensive storage electricity.During this is battery operated, its both positive and negative polarity and sealing coat are in high temperature fused state, it is necessary to be equipped with heating, thermal environment condition.
As in figure 2 it is shown, the power storage system of the present invention includes high temperature fluent metal battery, low temperature liquid metal battery, DC bus capacitor device, grid-connected converter and cable.The positive pole of high temperature fluent metal battery is connected with the negative pole of low temperature liquid metal battery by cable, its negative pole is connected with the positive pole of DC bus capacitor device by cable, the positive pole of low temperature liquid metal battery is connected with the negative pole of DC bus capacitor device by cable, and this DC bus capacitor device accesses electrical network by cable via grid-connected converter.
The electric energy that liquid metal cell stores is controlled by grid-connected converter, having two-way flow ability: when electrical network electric energy is unnecessary or electricity price is relatively low, electrical network can be the high temperature fluent metal battery of the present invention by this grid-connected converter and low temperature liquid metal battery charges；When electrical network power shortage or electricity price are higher, the present invention can be by the electric energy feedback in liquid metal cell to electrical network.
The liquid metal cell of the present invention is individually positioned in high temperature and low temperature heat accumulation fused salt tank, and is called high temperature fluent metal battery and low temperature liquid metal battery.Select must to be fulfilled for during electrode metal and the electrolyte of two kinds of liquid metal cells following condition: the boiling point of battery electrode metal is higher than the temperature of high temperature melting salt cellar, and its fusing point is less than the temperature of low-temperature molten salt tank.
The grid-connected converter of the present invention is capable of realizing bidirectional electric energy flow；High temperature fluent metal battery is in addition to storing electric energy, it is also possible to the mode of sensible heat stores partial heat energy and uses as heater element, and electrical network electric energy is transformed into thermal energy storage；And low temperature liquid metal battery only stores electric energy.Heat accumulation fused salt can provide the temperature environment needed for running for liquid metal cell, decrease battery heat insulation, heat, the cost such as installation.Owing to heat accumulation fused salt is likely to be conductive material, the insulation protection that the part during therefore battery electrode is immersed in heat accumulation fused salt tank must be the most appropriate, prevent battery short circuit and electric leakage.
As it is shown on figure 3, the heat reservoir of the present invention includes solar energy heat trap, high temperature melting salt cellar, high temperature fluent metal battery body, low-temperature molten salt tank, steam generator, condenser, vapor wheel unit, electromotor and fused salt.High temperature melting salt cellar stores high-temperature molten salt.High temperature fluent metal battery is put in high temperature melting salt cellar, and low temperature liquid metal battery is put in low-temperature molten salt tank.High temperature fluent metal battery body adds fused salt heat exchanging pipeline and heat exchanger, it is possible to carry out heat exchange with fused salt.
The outfan of solar energy heat trap is connected with the input of high temperature melting salt cellar by heat transfer pipe, the outfan of high temperature melting salt cellar by heat transfer pipe and is connected with the high temperature input of steam generator via a three-way valve, and the low temperature outfan of this steam generator is connected with the input of low-temperature molten salt tank by heat transfer pipe.Low-temperature molten salt tank has two output ports, one is connected with the input of solar energy heat trap by heat transfer pipe, another is connected with the input of the heat transfer pipe on the battery body of the high temperature fluent metal battery in high temperature melting salt cellar by heat transfer pipe, and this battery body must be crossed also by heat transfer pipe and also be connected with the high temperature input of steam generator via above-mentioned three-way valve.Steam generator is connected with electromotor by vapor wheel unit, and electromotor is connected with electrical network, and condenser is connected to be back to the pipeline of steam generator from vapor wheel unit.
In the fused salt circulation line that the present invention is formed, low-temperature molten salt has two kinds of approach to realize again heating.Mode one, can heat again via solar energy heat trap；Mode two, this high-temperature body solution battery body can be flowed through via the heat transfer pipe being arranged on high temperature fluent metal battery body, become high-temperature molten salt by heat exchange, then flow out to the high temperature melting salt cellar at this high temperature fluent metal battery place, via the high temperature input of three-way valve to steam generator.
The operation material storing heat energy of the present invention is fused salt and high temperature fluent metal battery body.
During specific works, after the present invention is in the heat energy release of initial duty or heat reservoir storage, high temperature melting salt cellar is empty, and high temperature fluent metal battery body has been also reduced to its minimum operating temperature (more than the fusing point of battery electrode metal), and all of fused salt all leaves in low-temperature molten salt tank.
Under daytime sunshine condition, low-temperature molten salt heats through solar energy heat trap, becomes high-temperature molten salt and is stored in high temperature melting salt cellar, and high-temperature molten salt is heated to the condition of high temperature (below the boiling point of battery electrode metal) high temperature fluent metal battery body simultaneously.Also can produce steam during high-temperature molten salt heat accumulation simultaneously and promote vapor wheel unit generation.High-temperature heat-storage working medium heat accumulation process can be carried out with vapor wheel unit generation simultaneously.In order to make full use of heat storage capacity, before sunshine condition disappearance, all fused salts have been heated to the condition of high temperature and have stored.
Under the conditions of night or peak of power consumption, the heat energy that heat reservoir stores starts release and is converted into electric energy to electrical network feeding through vapor wheel unit.First discharge is the heat energy that stores of high-temperature molten salt, and high-temperature molten salt produces high temperature and high pressure steam by steam generator and promotes vapor wheel unit to operate, and after heat exchange, temperature of molten salt reduces simultaneously, becomes low-temperature molten salt and is back to low-temperature molten salt tank and stores.When in high temperature melting salt cellar, fused salt quantity drops to nearly zero, the heat energy stored in high temperature fluent metal battery body does not discharge, and this battery keeps the condition of high temperature.Again the part fused salt in low-temperature molten salt tank is pumped into by pumping installations the pipeline in battery body, controls fused salt flow velocity and ensure that low-temperature molten salt can be heated to the condition of high temperature by battery body.Fused salt after heating can complete heat energy by above-mentioned same process and change to electric energy.
Under the conditions of illumination deficiency for a long time or other particular/special requirements, fused salt heat accumulation efficiency will be substantially reduced, and liquid metal cell now can be utilized as heater element, electrical network electric energy is changed into heat energy, for low-temperature molten salt is heated into high-temperature molten salt, store more energy.
The present invention can store heat energy and electric energy simultaneously, can improve the motility that solar light-heat power-generation system is run greatly, improves efficiency and economic benefit.
Liquid metal cell energy storage function and heat storage function, it is possible to break away from the single mode of operation of " daytime, heat accumulation, generated electricity night ", enable the invention to tackle more flexibly the electricity consumption occasion of electrical network peak of power consumption and low ebb.Daylight and electricity consumption are all peaks, partial heat energy is used for generating electricity, simultaneously liquid metal cell can also discharge to provide higher generated output simultaneously.Need for electricity decline in evening, illumination disappear, and heat energy, electric energy that high-temperature molten salt and liquid metal cell store generate electricity simultaneously, it is provided that maximum generated output.Electrical network low power consumption, electricity price low ebb after the late into the night, liquid metal cell can utilize electrical network electric energy to be charged, the present invention even can be using high temperature fluent metal battery as heater element, the low price electric energy of electrical network is converted into heat energy, low-temperature molten salt heating is become high-temperature molten salt, it is achieved store while electric energy, heat energy.
The power storage system of the present invention can depart from solar-thermal generating system control, independently accepts dispatching of power netwoks and carries out discharge and recharge operation；When the electric energy that electrical network cannot receive described solar light-heat power-generation system to send, unnecessary electric energy is that described liquid metal cell charges by grid-connected converter；When the electric energy that described solar light-heat power-generation system sends can not meet electrical network power demands, the electric energy that described liquid metal cell stores is by combining inverter feed-in electrical network.
The heat reservoir of the present invention can be to use sensible heat heat accumulation mode, latent heat (phase transformation) heat accumulation mode, single tank mesolimnion heat accumulation mode or solid-state working medium heat accumulation mode.Heat accumulation working medium can be liquid or solid-state, but heat accumulation working medium and liquid metal cell electrode have dielectric.
The present invention has operation control method flexibly, it is not limited to solar light-heat power-generation system, and any occasion such as UTILIZATION OF VESIDUAL HEAT IN, geothermal power generation etc. mainly needing heat accumulation energy all can use.
Claims (9)
1. a solar light-heat power-generation system, it is characterised in that include power storage system and heat reservoir；
Power storage system includes that grid-connected converter and two liquid metal cells, two liquid metal cell series connection form set of cells, and described set of cells is connected in parallel with the DC bus capacitor device of grid-connected converter, and grid-connected converter is connected with electrical network；
Being positioned over the liquid metal cell in high-temperature storage tank is high temperature fluent metal battery, and being positioned over the liquid metal cell in low temperature storage tank is low temperature liquid metal battery；
Heat reservoir includes solar energy heat trap, high-temperature storage tank, high temperature fluent metal battery body, low temperature storage tank, steam generator, vapor wheel unit, electromotor and heat accumulation working medium；Heat accumulation working medium enters in high-temperature storage tank after being heated by solar energy heat trap, and the heat accumulation working medium becoming low temperature after release heat energy enters low temperature storage tank, and wait is heated again；The heat accumulation working medium of low temperature is heated again by high temperature fluent metal battery body, becomes the heat accumulation working medium of high temperature；The heat energy that the heat accumulation working medium of high temperature stores provides high temperature and high pressure steam by steam generator for steam turbine power generating, promotes vapor wheel unit and electrical power generators, and electromotor is connected with electrical network.
Solar light-heat power-generation system the most according to claim 1, it is characterised in that the battery electrode being immersed in described heat accumulation working medium of described liquid metal cell increases insulation protection, prevents the short circuit of described liquid metal cell or electric leakage.
Solar light-heat power-generation system the most according to claim 1, it is characterized in that, described liquid metal cell uses the boiling point of battery electrode metal to be higher than the maximum operating temperature of described heat accumulation working medium and the fusing point of the battery electrode metal liquid metal cell less than the minimum operating temperature of described heat accumulation working medium；Described high temperature fluent metal battery body is with sensible heat mode heat accumulation, and this high temperature fluent metal battery body is equipped with the heat energy input that will store or the heat-exchanger rig of output high temperature fluent metal battery body.
Solar light-heat power-generation system the most according to claim 1, it is characterised in that described heat accumulation working medium uses liquid refrigerant or solid-state working medium.
Solar light-heat power-generation system the most according to claim 1, it is characterised in that described grid-connected converter uses voltage converter.
Solar light-heat power-generation system the most according to claim 1, it is characterized in that, described grid-connected converter uses the current transformer with realizing bidirectional electric energy flow, it is described high temperature fluent metal battery and the charging of low temperature liquid metal battery when electrical network electric energy is unnecessary or electricity price is relatively low, when electrical network power shortage or electricity price are higher by the electric energy feedback of storage in described high temperature fluent metal battery to electrical network.
7. an energy storage method for solar light-heat power-generation system as described in any one in claim 1-6, comprises the steps:
After the heat energy release that initial duty or heat reservoir store, high-temperature storage tank is empty, and high temperature fluent metal battery body has been also reduced to its minimum operating temperature, and all of heat accumulation working medium all leaves in low temperature storage tank；
Under the conditions of solar energy supply on daytime is abundant, low temperature heat accumulation working medium heats through solar energy heat trap, becomes high-temperature heat-storage working medium and is stored in high-temperature storage tank, and high-temperature heat-storage working medium is heated to the condition of high temperature high temperature fluent metal battery body simultaneously；High-temperature heat-storage working medium heat accumulation process can be carried out with vapor wheel unit generation simultaneously；
Under the conditions of night or peak of power consumption, the heat energy that heat reservoir stores starts release and is converted into electric energy to electrical network feeding through vapor wheel unit；First discharge is the heat energy of high-temperature heat-storage working medium storage, high-temperature heat-storage working medium produces high temperature and high pressure steam by steam generator and promotes vapor wheel unit to operate, after release heat energy, heat accumulation Temperature of Working reduces, and becomes low temperature heat accumulation working medium and is back to low temperature storage tank and stores；When in high-temperature storage tank, heat accumulation working medium quantity is close to zero, the heat energy stored in high temperature fluent metal battery body does not discharge, this high temperature fluent metal battery keeps the condition of high temperature, again the part heat accumulation working medium in low temperature storage tank is pumped into the pipeline in this high temperature fluent metal battery body by pumping installations, low temperature heat accumulation working medium can reheat into high-temperature heat-storage working medium, and the high-temperature heat-storage working medium reheated produces high temperature and high pressure steam by steam generator and promotes vapor wheel unit generation.
The energy storage method of solar light-heat power-generation system the most according to claim 7, it is characterised in that described power storage system can depart from solar-thermal generating system control, independently accepts dispatching of power netwoks and carries out discharge and recharge operation；When the electric energy that electrical network cannot receive described solar light-heat power-generation system to send, unnecessary electric energy is that described liquid metal cell charges by grid-connected converter；When the electric energy that described solar light-heat power-generation system sends can not meet electrical network power demands, the electric energy that described liquid metal cell stores is by combining inverter feed-in electrical network.
The energy storage method of solar light-heat power-generation system the most according to claim 7, it is characterized in that, described high temperature fluent metal battery can be as heater element when illumination is not enough for a long time or heat accumulation working medium heat accumulation efficiency reduces, electrical network electric energy being changed into heat energy, storing energy for low temperature heat accumulation working medium being heated into high-temperature heat-storage working medium.
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| WO2022231812A1 (en) * | 2021-04-30 | 2022-11-03 | Microsoft Technology Licensing, Llc | Integrated energy storage system including a thermal energy storage coupled with a liquid metal battery storage and a cryogenic energy storage |
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|---|---|---|---|---|
| CN104505526B (en) * | 2014-12-15 | 2016-08-24 | 西安交通大学 | A kind of liquid metal cell and liquid metal cell multikilowatt module |
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