CN105066477A - Novel single-tank solar fused salt energy storage system - Google Patents
Novel single-tank solar fused salt energy storage system Download PDFInfo
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- CN105066477A CN105066477A CN201510441485.2A CN201510441485A CN105066477A CN 105066477 A CN105066477 A CN 105066477A CN 201510441485 A CN201510441485 A CN 201510441485A CN 105066477 A CN105066477 A CN 105066477A
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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
Abstract
The invention relates to a novel single-tank solar fused salt energy storage system. The novel single-tank solar fused salt energy storage system comprises a solar heat collector, a fused salt storage tank and a steam turbine system. An energy input pipe is arranged between the solar heat collector and the fused salt storage tank. An energy output pipe is arranged between the fused salt storage tank and the steam turbine system. The energy input pipe is formed by sequentially connecting the solar heat collector, a loading steam pump, a first inlet adjusting valve, the fused salt storage tank and a first outlet adjusting valve through pipelines. The energy output pipe is formed by sequentially connecting the steam turbine system, an unloading steam pump, a second inlet adjusting valve, the fused salt storage tank and a second outlet adjusting valve through pipelines. An external insulation layer is arranged on the wall of the fused salt storage tank, and energy storage media in the fused salt storage tank are graphite energy storage media. By means of the novel single-tank solar fused salt energy storage system, two tanks are changed to one tank, so that use of fused salt pumps is reduced, and initial investment and occupied area of the system are reduced.
Description
Technical field
The present invention relates to solar energy thermal-power-generating field, be specifically related to a kind of novel single tank solar molten salt energy-storage system.
Background technology
The Main Means of solar energy thermal-power-generating comprises dish-style, tower, slot type and linear Fresnel.The difference of different modes is mainly that solar energy heating form is different, and the basic physical process of generating is substantially identical, is all based on luminous energy-power process.The principle of solar heat power technology adopts solar concentrating system exactly by direct solar radiation reflecting focal to central heat dump surface, and converts solar energy to heat energy, is then carried out storing by heat energy and generates electricity through stirling generator.
Because solar energy has the feature such as intermittence, low hot-fluid, the solar energy marketization and scale utilize exists some technical bottlenecks.Meanwhile, also there is a key issue in solar energy power plant utilization and extention is exactly high cost, and floor space is excessive, and the chances are is several times as much as fossil energy thermal power generation cost for the cost of solar energy thermal-power-generating.Therefore, the marketization of solar energy thermal-power-generating needs scientific and technical personnel to adopt technological means to reduce cost of electricity-generating on the one hand, also needs the rational renewable energy power generation price of government formulate and other policy regulations on the other hand.
Solar energy relies on scientific and reasonable heat reservoir to be to realize continuous power generation process.Energy-storage system conventional at present comprises sensible heat energy storage, hidden heat energy storage, chemical energy storage.Wherein, sensible heat energy storage to be succeeded application at multiple business solar energy power plant, and such as the country such as Germany, Spain, China and the U.S. has successively built up solar energy utilization system.Hidden heat energy storage and chemical energy storage also rest on experimental stage or pilot scale initial stage.In existing sensible heat energy storage technology, what generally adopt is two can system, a namely hot tank and a cold tank, the heat-storage medium in storage tank mainly comprises: water, fused salt, concrete, metal aluminum alloy etc., and heat transfer medium mainly comprises: water, conduction oil, fused salt etc.The advantage of two tank system is simplicity of design, clear process; And shortcoming is that system footprint area is large, initial cost is too high, and pump consumption is larger.Therefore, a kind of novel single tank solar energy tank system of research and rational regulatory mechanism have important practical significance and scientific meaning.
Summary of the invention
The object of this invention is to provide a kind of novel single tank solar molten salt energy-storage system, this novel single tank solar molten salt energy-storage system solves in existing solar energy system efficiency utilization process that floor space is excessive, initial cost is too high, the problem of poor stability.
The technical solution adopted for the present invention to solve the technical problems is: this novel single tank solar molten salt energy-storage system comprises solar thermal collector, a fused salt storage tank, turbine system, solar thermal collector and turbine system are separately positioned on the both sides of fused salt storage tank, energy intake line is set between solar thermal collector and fused salt storage tank, energy output pipe is set between fused salt storage tank and turbine system, energy intake line is by solar thermal collector, load steam pump, first inlet adjustment valve, fused salt storage tank, first outlet regulating valve is formed by connecting by pipeline successively, energy output pipe by turbine system, put carry a steam pump, the second inlet adjustment valve, fused salt storage tank, the second outlet regulating valve be formed by connecting by pipeline successively, the tank skin of fused salt storage tank is provided with external thermal insulation, and the energy-accumulating medium in fused salt storage tank adopts graphite fused-salt medium, and graphite fused-salt medium is made up of sodium nitrate, potassium nitrate, graphite, and according to mass percent, sodium nitrate is 35-50%, potassium nitrate is 45-55%, graphite is 4-10%, energy intake line and energy output pipe separate, make heat transfer medium with water-based nano-fluid.
In such scheme in graphite fused-salt medium, according to mass percent, sodium nitrate is 43%, potassium nitrate is 50%, graphite is 7%.
Also bypass is provided with between solar thermal collector, turbine system in such scheme, bypass is arranged between solar thermal collector, turbine system by bypass pump, by-passing valve, adopts bypass directly segment fluid flow to be introduced turbine system after solar thermal collector heating and generates electricity.
In such scheme, the method for work of novel single tank solar molten salt energy-storage system completes separately by loading and put to carry, specific as follows:
When system loads, now the second inlet adjustment valve, the second outlet regulating valve are closed, put and carry steam pump closedown, and the first inlet adjustment valve, the first outlet regulating valve are opened, and load steam pump to open, heat transfer medium absorbs heat from solar thermal collector, convert high-temperature high-pressure steam to, then flow through single tank molten salt energy-storage device, graphite molten salt energy-storage medium temperature raises, graphite fused salt coldly solid-stately became hot liquid from crossing, and loading procedure completes; When system carry out putting carry time, namely cloudy weather or evening, now the second inlet adjustment valve, the second outlet regulating valve are opened, put a year steam pump to open, and the first inlet adjustment valve, the first outlet regulating valve are closed, loading steam pump is closed, heat transfer medium flows out from turbine system, temperature is improved through single tank molten salt energy-storage device, carry out absorbing heat and converting high-temperature high-pressure steam to, then flow back in turbine system and complete relevant generating, condensation, the temperature of molten salt now in single tank molten salt energy-storage device declines, be returned to initial point, put the process of carrying and complete.
The present invention has following beneficial effect:
1, present invention achieves solar energy storage system from two tank to the technical change of single tank, decrease the use of pump for liquid salts, initial cost and the floor space of system can be saved.The present invention only has single solar molten salt storage tank, changes traditional two tank storage energy system and theory.Fixed by fused salt storage tank as energy-accumulating medium, change flowing and the control of heat transfer medium, have two pipelines in storage tank cyclic design, lay respectively at the left and right sides of storage tank, side realizes the input of the energy, and side realizes the output of the energy.The space-time that the present invention successfully can realize cold and hot molten salt energy-storage medium in single can system by rational regulatory mechanism coexists and is separated.Carry in process in loading and putting, the invariant position of fused-salt medium, change be different heat transfer directions and process, heating and exothermic process are separated, realize energy storage and the ultimate unification of dispose procedure of solar energy.Single tank system of the present invention can reduce the floor space 4% of system, reduces the initial cost 3% of system.
2, the present invention adopts water-based nano-fluid as heat transfer medium and adopts graphite fused salt as energy-accumulating medium, improves the heat transfer efficiency 7% of system.
3, invention increases the stability of system, economy and reliability.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1 solar thermal collector, 2 fused salt storage tanks, 3 turbine systems, 4 load steam pump, 5 first inlet adjustment valve, 6 first outlet regulating valves, and 7 put a year steam pump, 8 second inlet adjustment valve, 9 second outlet regulating valves, 10 bypass pumps, 11 by-passing valves.
Detailed description of the invention
The present invention is further illustrated below:
As shown in Figure 1, this novel single tank solar molten salt energy-storage system comprises solar thermal collector 1, fused salt storage tank 2, a turbine system 3, solar thermal collector 1 and turbine system 3 are separately positioned on the both sides of fused salt storage tank 2, energy intake line is set between solar thermal collector 1 and fused salt storage tank 2, arrange energy output pipe between fused salt storage tank 2 and turbine system 1, energy intake line is formed by connecting by pipeline successively by solar thermal collector 1, loading steam pump 4, first inlet adjustment valve 5, fused salt storage tank 2, first outlet regulating valve 6; Energy output pipe by turbine system 3, put and carry steam pump 7, second inlet adjustment valve 8, fused salt storage tank 2, second outlet regulating valve 9 and be formed by connecting by pipeline successively; The tank skin of fused salt storage tank 2 is provided with external thermal insulation, energy-accumulating medium in fused salt storage tank 2 adopts graphite fused-salt medium, graphite fused-salt medium is made up of sodium nitrate, potassium nitrate, graphite, and according to mass percent, sodium nitrate is 43%, potassium nitrate is 50%, graphite is 7%; Energy intake line and energy output pipe separate, with water-based nano-fluid as heat transfer medium.Nano-fluid refers to that a metal or non pinetallic nano powder are distributed in water, alcohol, wet goods tradition heat transferring medium, is prepared into heat transferring medium that is even, stable, high heat conduction.And the water base aqueous fluid of receiving in the present invention, be nano-powder is distributed in water formed.The water base aqueous fluid of receiving that this material is made has the high advantage of heat transfer property.
Also bypass is provided with between solar thermal collector 1, turbine system 3 in the present invention, bypass is arranged between solar thermal collector 1, turbine system 3 by bypass pump 10, by-passing valve 11, adopts bypass directly segment fluid flow to be heated rear introducing turbine system 3 from solar thermal collector 1 and generates electricity.
The operation of solar energy system is subject to the restriction of the factor such as intensity of solar radiation and peak regulation time, and in system cloud gray model, heat transfer medium can change according to the requirement of system, and that commonly uses at present comprises water, conduction oil, fused salt etc., respectively has superiority.Water is as heat transfer medium, and flow process is simple, and require lower to water pump, shortcoming is that heat transfer efficiency is relatively low; Conduction oil is as heat transfer medium, and heat transfer efficiency can improve 5%, and shortcoming easily forms pipeline burn and cause pipeline blockage; Fused salt, as heat transfer medium, can realize the unification of heat transfer medium and energy-accumulating medium, but the requirement of system to pump for liquid salts is higher, the increase by more than 6% of pump consumption, and the stability of fused salt reduces greatly.Invention adopts water (nano-fluid) as heat transfer medium, and the pump for liquid salts in two can system can directly be cancelled, and improves the stability of system, reliability.The present invention reduces the storage tank quantity of conventional energy-storage system, the space-time being realized cold and hot fused salt by Reasonable Regulation And Control is separated, and reduces the initial cost of system, decreases floor space and system solar generator cost simultaneously.Energy-accumulating medium of the present invention have employed graphite fused-salt medium (sodium nitrate-potassium nitrate-graphite), can improve the energy conversion efficiency 7% of system like this, and increase the stability of system.According to experimental study display, sodium nitrate-potassium nitrate-graphite medium (mass percent is respectively 43%-50%-7%) is after experience 1 loads and put year circulation, and stability reduces by 0.01%; After 100 circulations, stability reduces by 0.2%; After 500 circulations, stability reduces by 0.8%; After 1000 circulations, stability reduces by 1.7%; After 3000 circulations, stability reduces by 4.2%.
Method of work of the present invention:
When system loads, now the second inlet adjustment valve 8, second outlet regulating valve 9 cuts out, put a year steam pump 7 to close, and the first inlet adjustment valve 5, first outlet regulating valve 6 is opened, load steam pump 4 to open, heat transfer medium absorbs heat from solar thermal collector 1, convert high-temperature high-pressure steam to, then single tank molten salt energy-storage device is flowed through, graphite molten salt energy-storage medium temperature raises, graphite fused salt coldly solid-stately became hot liquid from crossing, the system stored energy time is relevant with the peak regulation time that intensity of solar radiation and electrical network need, the external insulation of molten salt energy-storage device can adopt multilayer novel heat preservation structure to realize the critical state of insulation of insulating process, therefore, in storage tank, the heat output of fused-salt medium and external environment can be ignored.After this serial procedures, loading procedure completes.When system carry out putting carry time, namely cloudy weather or evening, now the second inlet adjustment valve 8, second outlet regulating valve 9 is opened, put a year steam pump 7 to open, and the first inlet adjustment valve 5, first outlet regulating valve 6 cuts out, load steam pump 4 to close, heat transfer medium (steam) flows out from turbine system 3, temperature is improved through single tank molten salt energy-storage device, carry out absorbing heat and converting high-temperature high-pressure steam to, then flow back in turbine system 3 and complete relevant generating, the cyclic processes such as condensation, temperature of molten salt now in single tank molten salt energy-storage device declines, be returned to initial point, put the process of carrying to complete.
Above-mentioned cyclic process is to load and put to carry and completes separately, for under certain applications operating mode, need to load and put to carry to carry out simultaneously, the present invention also considers and realizes, concrete mode is: when the input energy sources of system is greater than user's request, directly can carry out part to load and part utilization, now, second inlet adjustment valve 8, second outlet regulating valve 9 cuts out, only a by-pass line need be adopted directly segment fluid flow to be heated rear introducing steam turbine system 3 system from solar thermal collector 1 to generate electricity, remainder normally stores, the regulating and controlling of quantities of load can be realized by the change of flow.When the input energy sources of system is less than user's request, can carry out part put carry and part utilize, now, first inlet adjustment valve 5, first outlet regulating valve 6 cuts out, directly whole fluid is heated rear introducing turbine system 3 from solar thermal collector 1 by by-pass line to generate electricity, differential section between the two is then supplemented by the energy storage of system.Therefore, whole process also can realize completely by designing and regulating and controlling.
Claims (4)
1. a novel single tank solar molten salt energy-storage system, it is characterized in that: this novel single tank solar molten salt energy-storage system comprises solar thermal collector (1), a fused salt storage tank (2), turbine system (3), solar thermal collector (1) and turbine system (3) are separately positioned on the both sides of fused salt storage tank (2), between solar thermal collector (1) and fused salt storage tank (2), energy intake line is set, between fused salt storage tank (2) and turbine system (3), energy output pipe is set, energy intake line is by solar thermal collector (1), load steam pump (4), first inlet adjustment valve (5), fused salt storage tank (2), first outlet regulating valve (6) is formed by connecting by pipeline successively, energy output pipe by turbine system (3), put carry a steam pump (7), the second inlet adjustment valve (8), fused salt storage tank (2), the second outlet regulating valve (9) be formed by connecting by pipeline successively, the tank skin of fused salt storage tank (2) is provided with external thermal insulation, and the energy-accumulating medium in fused salt storage tank (2) adopts graphite fused-salt medium, and graphite fused-salt medium is made up of sodium nitrate, potassium nitrate, graphite, and according to mass percent, sodium nitrate is 35-50%, potassium nitrate is 45-55%, graphite is 4-10%, energy intake line and energy output pipe separate, make heat transfer medium with water-based nano-fluid.
2. novel single tank solar molten salt energy-storage system according to claim 1, is characterized in that: in described graphite fused-salt medium, according to mass percent, sodium nitrate is 43%, potassium nitrate is 50%, graphite is 7%.
3. novel single tank solar molten salt energy-storage system according to claim 2, it is characterized in that: described solar thermal collector (1), turbine system are also provided with bypass between (3), bypass is arranged between solar thermal collector (1), turbine system (3) by bypass pump (10), by-passing valve (11).
4. novel single tank solar molten salt energy-storage system according to claim 3, is characterized in that: the method for work of described novel single tank solar molten salt energy-storage system completes separately by loading and put to carry, specific as follows:
When system loads, now the second inlet adjustment valve (8), the second outlet regulating valve (9) are closed, put and carry steam pump (7) closedown, and the first inlet adjustment valve (5), the first outlet regulating valve (6) are opened, load steam pump (4) to open, heat transfer medium absorbs heat from solar thermal collector (1), convert high-temperature high-pressure steam to, then single tank molten salt energy-storage device is flowed through, graphite molten salt energy-storage medium temperature raises, graphite fused salt coldly solid-stately became hot liquid from crossing, and loading procedure completes, when system carry out putting carry time, namely cloudy weather or evening, now the second inlet adjustment valve (8), second outlet regulating valve (9) is opened, put a year steam pump (7) to open, and the first inlet adjustment valve (5), first outlet regulating valve (6) cuts out, load steam pump (4) to close, heat transfer medium flows out from turbine system (3), temperature is improved through single tank molten salt energy-storage device, carry out absorbing heat and converting high-temperature high-pressure steam to, then flow back in turbine system (3) and complete relevant generating, condensation, temperature of molten salt now in single tank molten salt energy-storage device declines, be returned to initial point, put the process of carrying to complete.
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Cited By (8)
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| CN105650900A (en) * | 2015-12-30 | 2016-06-08 | 中海阳能源集团股份有限公司 | Groove type solar high-temperature heat collecting device and method for thickened oil steam injection production through groove type solar high-temperature heat collecting device |
| CN105841350A (en) * | 2016-03-23 | 2016-08-10 | 深圳市爱能森设备技术有限公司 | Fused salt heat storage type heat exchange off-peak electricity hot water boiler with built-in single tank and heat exchange method |
| CN107062183A (en) * | 2017-06-12 | 2017-08-18 | 黄善清 | A kind of single tank fused salt Heat storage type electric steam boilers |
| CN107989760A (en) * | 2017-12-08 | 2018-05-04 | 北京兆阳光热技术有限公司 | Solar-thermal generating system |
| CN107989759A (en) * | 2017-12-08 | 2018-05-04 | 北京兆阳光热技术有限公司 | Solid heat accumulation electricity generation system and photo-thermal power station |
| CN108087849A (en) * | 2017-12-08 | 2018-05-29 | 北京兆阳光热技术有限公司 | Opto-thermal system and photo-thermal power station |
| CN109186296A (en) * | 2018-08-27 | 2019-01-11 | 上海锅炉厂有限公司 | A kind of solar energy optical-thermal heat accumulation fused salt tank |
| CN109185854A (en) * | 2018-10-17 | 2019-01-11 | 中国船舶重工集团公司第七0三研究所 | One kind is based on single tank heat accumulating type energy storage multipotency co-feeding system |
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| CN109185854A (en) * | 2018-10-17 | 2019-01-11 | 中国船舶重工集团公司第七0三研究所 | One kind is based on single tank heat accumulating type energy storage multipotency co-feeding system |
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