CN101298944B - Passive molten salt thermal absorber - Google Patents
Passive molten salt thermal absorber Download PDFInfo
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- CN101298944B CN101298944B CN200810102397XA CN200810102397A CN101298944B CN 101298944 B CN101298944 B CN 101298944B CN 200810102397X A CN200810102397X A CN 200810102397XA CN 200810102397 A CN200810102397 A CN 200810102397A CN 101298944 B CN101298944 B CN 101298944B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S90/00—Solar heat systems not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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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
Abstract
A passive fused salt heat absorber includes an endothermic pipe 1, a heat-resistant warming plate 2, a fused salt insulating layer 7, a lower collecting pipe 3, an upper collecting pipe 4; a fused salt tank 6 is arranged above the endothermic surface composed of a plurality of endothermic pipes 1. The endothermic surface faces to the heliostat field, the back of which is arranged with the heat-resistant warming plate 2. The outside of the fused salt tank 6 enwaraps the heat-resistant insulating layer 7, and the fused salt tank 6 and the heat-resistant insulating layer 7 enwrapped on the outside constitute a high temperature melt tank 12. The upper collecting pipe 4 is connected with the fused salt tank 6 through a rising pipe 5; the lower collecting pipe 3 is arranged at the lower part ofthe endothermic pipe 1, and the lower collecting pipe 3 is connected with fused salt tank 6 through a return pipe 9 to form a fused salt natural circulation loop. A endothermic surface can be used tomatch with a plurality of high temperature fused salt tanks 12, which forms the process of continuous heat absorption and heat charge and discharge.
Description
Technical field
The present invention relates to the device of a kind of solar energy tower type thermal generation system, particularly a kind of passive molten salt thermal absorber.
Background technology
Solar tower-type thermal power station is to utilize numerous heliostats with beam radia reflection and gather the solar heat absorber that places on the heat absorption tower, by heat-transfer working medium water, air, liquid metal or fuse salt etc. radiant energy is changed into the heat energy of heat dump output then.Heat dump is the core component of tower type thermal generation system, its year during trouble free service number determined the working time in year and the annual electricity generating capacity in whole power station.Heat dump can be flat or the cylinder formula.The heat absorption wall of existing heat dump generally is made up of tubulation, in the heat-transfer fluid heat convection is arranged.The surface coverage of tubulation has the rete of high solar absorptivity.Between the tubulation can be the polyphone also can be in parallel.Because there is optical parallax in heliostat, and position of sun over time, the solar radiation that projects the absorber surface is uneven and also changes in time in the absorber surface distributed.This reflected solar radiation heterogeneous makes absorber have big thermal stress, to the security of heat dump with cause direct influence service life.Improve these unfavorable factors following method is generally arranged: the one, utilize the adjustment heliostat that the energy-flux density that projects the heat dump surface is evenly distributed; The 2nd, a secondary condensation device is installed at the solar radiant energy inflow entrance place of heat dump, this concentrator by special surface to the secondary reflection of light with the light stream of incident become evenly; The 3rd, adopt in the endothermic tube enhanced heat exchange mode that high temperature is eliminated, temperature is even everywhere to make endothermic tube.Many research has been launched in countries in the world to this.It is heat-transfer fluid with the fuse salt that U.S. Pat 5850831 discloses a kind of, twine the tubular type heat dump that metal brings enhanced heat exchange in the pipe, the enhanced heat exchange measure that this heat dump is taked can be so that heat-absorbent surface can be with the bigger pipe of diameter, so, the steel using amount of heat dump reduces during just than the little plain tube of solid matter to some extent, can reduce cost.But because the unfavorable factor that adopts this method to bring is to cause the interior flow resistance of endothermic tube significantly to increase.It is heat-transfer fluid with the fuse salt that U.S. Pat 5862800 discloses a kind of, uses the heat dump of 625 steel alloys as absorber.Because the coefficient of expansion of metal is low, high temperature resistant (605 ℃ of following long-term works), the heat-resistant anti-fatigue performance is good.Therefore can improve the heat flow density on heat dump surface, improve the life-span of heat dump, reduce cost.It is the cooling system of the heat dump of heat-transfer fluid with the fuse salt that U.S. Pat 6701711B1 discloses a kind of.This system is used to prevent accident generations such as overheated.United States Patent (USP) 2006/0179840A1 discloses a kind of molten salt thermal absorber that is used for dish formula concentrator.The combination of a plurality of dish/heat dumps gives in the salt cellar to add heat injection salt.Chinese invention patent publication number 101050355 discloses a kind of fusion tray of thermal transmission and storage medium and preparation method thereof.Described fusion tray of thermal transmission and storage medium comprises potassium nitrate, sodium nitrate, natrium nitrosum and additive, and wherein, described additive is (0.1～0.8) by mass ratio: 1 cesium nitrate and potassium chloride are formed.Above-mentioned patent all is the preparations at the fuse salt material, the absorber metal material choose invention with aspect such as endothermic tube enhanced heat exchange mode, and the fuse salt heat exchange of high temperature circulation all needs to use the fusion salt pump, and consumes the pump merit.
Summary of the invention
The objective of the invention is to overcome in the solar energy tower type thermal generation technology, because solar energy unstable state, non-uniform Distribution, and the characteristics of high heat flux, and cause the heat dump surface to form the problem of local " hot spot ", a kind of molten salt thermal absorber that adopts the operation of passive type natural circulation mode is proposed.The present invention cancels the high-temperature fusion salt circulating pump of heat-exchanging loop, utilizes the density contrast of heat-exchange working medium fuse salt, picks up from right endless form and takes heating and melting salt, and passive type adapts to and improve the phenomenon of heat dump surface local " hot spot " automatically.The present invention also can overcome the technical barrier of high-temperature fusion salt pump in the prior art.
Passive molten salt thermal absorber of the present invention by endothermic tube, heat-resisting heat-insulation layer, high-temperature fusion salt cellar, go up critical pieces such as collection connection pipe, next part connection pipe and form.The arrangement form of endothermic tube in heat dump can be that cavity type also can be the cylinder formula, and there is high temperature resistant solar selectively absorbing coating on the endothermic tube surface.The high-temperature fusion salt cellar is positioned at the heat absorbing units top that endothermic tube is formed.The heat absorbing units front of being made up of many endothermic tubes is towards the heliostat field, and heat absorbing units is equipped with heat-resisting heat-insulation layer behind.Heat-resisting heat-insulation layer is equipped with in the outside of high-temperature fusion salt cellar.Heat absorbing units top is last collection connection pipe, and last collection connection pipe is connected by tedge with the high-temperature fusion salt cellar.The heat absorbing units bottom is a next part connection pipe, and next part connection pipe is connected by return duct with the high-temperature fusion salt cellar, forms the fuse salt natural convection loop.Fuse salt is filled in endothermic tube and the high-temperature fusion salt cellar.
After the solar radiation that heliostat field reflection is assembled arrives the heat absorbing units surface, absorbed by the high temperature resistant coating for selective absorption on endothermic tube surface and be converted to heat energy.The back density of being heated fuse salt in the endothermic tube reduces, risen by the buoyancy lift effect, enter the high-temperature fusion salt cellar on top, fuse salt in the high-temperature fusion salt cellar, salt cellar upper temp height, temperature of lower is low, produce layering owing to temperature is different, therefore density bigger fuse salt in high-temperature fusion salt cellar bottom relies on the gravity effect to flow in the endothermic tube through return duct downwards, forms the Natural Circulation of fuse salt between endothermic tube and high-temperature fusion salt cellar.Since position that " hot spot " that non-homogeneous hot-fluid produces on endothermic tube surface takes place and time can't be artificial accurate control, the passive molten salt thermal absorber of this Natural Circulation can adapt to " hot spot " on endothermic tube surface automatically, at " hot spot " nidus, because partial melting salt temperature raise rapidly in the heat flow density height caused managing, the fuse salt density of high temperature diminishes in this process, rise rapidly and flow, and the relatively large watery fusion salt of density is filled up carry out heat exchange simultaneously, so circulation.Utilize this mode to form relatively even temperature field at the plate face, to reduce thermal stress, guaranteed the security of heat dump by the mobile and heat exchange of each diverse location in the Natural Circulation adjusting endothermic tube voluntarily.The present invention utilizes the Natural Circulation of fuse salt, the characteristics of passive type response, so passive molten salt thermal absorber of the present invention has safe and reliablely, operation control is easy, the characteristics of serviceability temperature wide ranges.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 heat dump structural representation of the present invention;
High-temperature fusion salt cellar structural representation in Fig. 2 heat dump of the present invention;
Fig. 3 passively charges and discharge hot system schematic by what the present invention formed;
Endothermic tube and the connected mode schematic diagram that collects the connection pipe in Fig. 4 heat dump of the present invention;
Fig. 5 heat dump cavity type of the present invention structural representation, Fig. 5 a are cavity type heat dump schematic side view, and Fig. 5 b is a cavity type heat dump front elevational schematic;
Fig. 6 heat dump outlet structure of the present invention schematic diagram, Fig. 6 a are the heat-absorbing model schematic side view that endothermic tube 1 is formed through connection in series-parallel, and Fig. 6 b is a heat dump outlet structure schematic top plan view.
Among the figure: 1 endothermic tube, 2 heat-resisting warming plates, 3 next parts connection pipe, collection connection pipe on 4,5 tedges, 6 fused salt tank, 7 heat-resisting heat-insulation layers, 8 valve A, 9 return ducts, 10 valve B, 11 valve C, 12 high-temperature fusion salt cellars, 13 valve D, 14 valve E, 15 valve F, 16 fins, 17 valve G, 18 air bleeding valve A, 19 air bleeding valve B, 20 master control air bleeding valve C, 21 salt transporting tubes, 22 valve J, 23 fusion salt pumps, 24 fuse salt heat-accumulator tanks, 25 heat exchange coils, 26 water pumps, 27 electric heaters, 28 thermocouples, 29 valve H, 30 valve I, 31 external thermal insulations, 32 heat radiation reflecting plates, 33 supports, 34 times salt pipes, salt pipe on 35,36 valve K, 37 valve L, 38 valve M, 39 pylons.
The specific embodiment
Fig. 1 is a heat dump structural representation of the present invention.As shown in Figure 1, heat dump of the present invention comprises endothermic tube 1, heat-resisting warming plate 2, high-temperature fusion salt cellar 12, goes up parts such as collecting connection pipe 4, next part connection pipe 3.Endothermic tube 1 outer surface is equipped with fin 16, and high temperature resistant solar selectively absorbing coating is arranged, and many endothermic tubes 1 are formed the heat absorption surface through serial or parallel connection.The heat absorption surface is over against the heliostat field, and heat-resisting warming plate 2 is equipped with on the heat absorption surface behind.Endothermic tube 1 top is last collection connection pipe 4, and last collection connection pipe 4 is connected by tedge 5 with high-temperature fusion salt cellar 12.Endothermic tube 1 bottom is a next part connection pipe 3, and next part connection pipe 3 is connected by return duct 9 with high-temperature fusion salt cellar 12.High-temperature fusion salt cellar 12 is positioned at endothermic tube 1 top.Tedge 5 and return duct 9 are installed on the left and right sides of high-temperature fusion salt 12 respectively.A heat-absorbent surface of being made up of by connection in series-parallel many endothermic tubes 1 can cooperate two or more high-temperature fusion salt cellars 12 to use, and charges and discharge heat continuously, as high-temperature fusion salt cellar A and high-temperature fusion salt cellar B.Tedge 5 is equipped with valve C11 and valve E14.Return duct 9 is equipped with valve A8 and valve F15.On the blast pipe at high-temperature fusion salt cellar A top air bleeding valve A18 is housed.On the blast pipe at high-temperature fusion salt cellar B top air bleeding valve B19 is housed.Two blast pipes are controlled by master control air bleeding valve C20.On the salt discharge pipe that high-temperature fusion salt cellar A installs below valve D13 is housed.On the salt discharge pipe that high-temperature fusion salt cellar B installs below valve G17 is housed.Fuse salt is filled in endothermic tube 1, and tedge 5 is in return duct 9 and the high-temperature fusion salt cellar 12.
After the solar radiation that heliostat field reflection is assembled arrives the heat absorption surface, absorbed by the high temperature resistant coating for selective absorption on endothermic tube 1 surface and be converted to heat energy.The back density of being heated fuse salt in the endothermic tube 1 reduces, risen by the buoyancy lift effect, enter the high-temperature fusion salt cellar 12 on top, the fuse salt temperature height on high-temperature fusion salt cellar 12 tops, the fuse salt temperature of bottom is low, fuse salt in the high-temperature fusion salt cellar 12 is owing to the density contrast that temperature difference produces causes lower leaf, so bigger fuse salt of high-temperature fusion salt cellar 12 bottom density, rely on the gravity effect to flow in the endothermic tube 1 through return duct 9 downwards, so form the Natural Circulation of fuse salt between endothermic tube 1 and high-temperature fusion salt cellar 12.
Fig. 2 is the high-temperature fusion salt cellar structural representation in the heat dump of the present invention.The high-temperature fusion salt cellar is made up of critical pieces such as fused salt tank 6, heat-resisting heat-insulation layer 7, electric heater 27, valve C11, valve A8, valve D13 and air bleeding valve A18.Heat-resisting heat-insulation layer 7 is wrapped in fused salt tank 6 outsides.K type armoured thermocouple 28 is equipped with in the bottom of fused salt tank 6 and sidewall many places, is used to detect the temperature of fuse salt.A plurality of electric heaters 27 are inserted in the jar by fused salt tank 6 tops, and preheating fuse salt under the operating mode of necessity prevents fuse salt cooled and solidified in jar.Valve C11 and valve A8 are contained in the both sides of fused salt tank 6 respectively, and valve C11 and valve A8 open when the fuse salt Natural Circulation, constitute closed circuit.Valve D13 is equipped with in fused salt tank 6 bottoms, and air bleeding valve A18 is equipped with at the top, and valve D13 and air bleeding valve A18 open when fuse salt charges into emptying.
Fig. 3 passively charges and discharge hot system schematic by what the present invention formed.Passive molten salt thermal absorber can be with salt transporting tube 21, return salt pipe 34, go up salt pipe 35 and valve J22, valve I30, valve K36, valve L37, fuse salt heat-accumulator tank 24 and fusion salt pump 23 forms that fuse salts are passive to charge and discharge hot system.Wherein heat dump partly is installed on the top or a certain height place of pylon 39.Fusion salt pump 23 is arranged on the ground of pylon 39 bottoms with fuse salt heat-accumulator tank 24.Salt transporting tube 21 is arranged in pylon 39 inside.The fuse salt that fuse salt heat-accumulator tank 24 temperature of lower are lower relies on fusion salt pump 23, is filled in the endothermic tube 1 through salt transporting tube 21.This charges and discharge hot system when using in the solar energy tower type thermal generation system, in endothermic tube 1, fuse salt absorbs the solar radiation temperature and raises, effect by buoyancy lift enters high-temperature fusion salt cellar 12, arrive design temperature by Natural Circulation, by gravity effect or inert gas purge, the high-temperature fusion salt that from high-temperature fusion salt cellar 12, comes out, turn back to the top of fuse salt heat-accumulator tank 24 through salt transporting tube 21 and go back to salt pipe 34.Heat exchange coil 25 is arranged at the top in fuse salt heat-accumulator tank 24.Aqueous water is squeezed in the heat exchange coil 25 through water pump 26, is heated and directly produces the superheated steam of a certain parameter.K36 closes when valve, valve J22, and valve I30, valve L37 opens, and when opening fusion salt pump 23 simultaneously, can carry out forced circulation to in-pot melting salt.The fuse salt that helps like this to prevent container 24 bottoms solidifies, and also can strengthen the heat convection of fuse salt and heat exchange coil 25.
Charging and discharging hot system continuously can be made up of corresponding two or more high-temperature fusion salt cellars 12 in heat absorption surface, and this example adopts 2 high-temperature fusion salt cellars: high-temperature fusion salt cellar A and high-temperature fusion salt cellar B.At high-temperature fusion salt cellar 12 tops air bleeding valve is housed, example exhaust valve A18, air bleeding valve B19 and master control air bleeding valve C20.Gas exhaust piping is connected with the protective gas container, as nitrogen, and argon gas etc.The gas that enters the fuse salt container requires to be preheating to more than the fusing point of fuse salt.It is as follows to charge and discharge hot system work process continuously:
One, the salt operation is filled in the loop first
Start the auxiliary heating of electricity that is installed in high-temperature fusion salt cellar 12 and salt transporting tube 21, goes up in the salt pipe 35 corresponding container, valve and pipeline are carried out preheating.At this moment, the valve A8 in the heat dump, valve B10, valve C11, valve E14, valve F15 etc. is in closed condition, air bleeding valve A18, and air bleeding valve B19, air bleeding valve C20 are in and often open, valve D13, valve G17 open, the valve I30 in the pipeline, and valve K36 opens, and valve J22 closes.More than the temperature of high-temperature fusion salt cellar 12 and each fuse salt pipeline, each valve reaches the temperature of fuse salt heat-accumulator tank 24 bottom fuse salts about 50 ℃ the time, open valve L37, start fusion salt pump 23, fuse salt flows out from fuse salt heat-accumulator tank 24, passes through salt pipe 35 successively, salt transporting tube 21 and valve L37, valve I30, valve K36, valve D13, valve G17 etc. charges into high-temperature fusion salt cellar A and high-temperature fusion salt cellar B.When the fuse salt among high-temperature fusion salt cellar A and the high-temperature fusion salt cellar B arrived the setting liquid level, fusion salt pump 23 was out of service, while valve D13, and valve F17, valve I30, valve L37 closes, and finishes and fills the salt process first.Air bleeding valve A18, air bleeding valve B19 and master control air bleeding valve C20 remain open mode in whole process.
Two, loop operation
Three, high-temperature fusion salt cellar A fills the salt operation for single jar
Behind the hot salt emptying among the high-temperature fusion salt cellar A, need fill the salt operation once more.It is as follows to fill the salt process, and valve B10, valve A8 and valve C11 are in closed condition, and valve D13, valve I30, valve K36 and valve L37 open.Starting fusion salt pump 23 pumps into the fuse salt in the fuse salt heat-accumulator tank 24 among the high-temperature fusion salt cellar A.After fuse salt among the high-temperature fusion salt cellar A reaches the setting liquid level, close fusion salt pump 23, valve-off D13, valve I30, valve K36 and valve L37.Air bleeding valve A18, B19 and master control air bleeding valve C 20 remain open mode in whole process.
Four, high-temperature fusion salt cellar B fills the salt operation for single jar
Behind the hot salt emptying among the high-temperature fusion salt cellar B, also need to fill once more the salt operation.It is as follows to fill the salt process, and valve B10, valve E14 and valve F15 are in closed condition, valve D17, and valve I30, valve K36 and valve L37 open, and start fusion salt pump 23 fuse salt in the fuse salt heat-accumulator tank 24 is pumped among the high-temperature fusion salt cellar B.After fuse salt among the high-temperature fusion salt cellar B reaches the setting liquid level, close fusion salt pump 23, valve-off D17, valve I30, valve K36 and valve L37.Air bleeding valve A18, air bleeding valve B19 and master control air bleeding valve C20 remain open mode in whole process.
In this system, salt transporting tube 21 is the common conduit of fuse salt when heat dump and high-temperature fusion salt cellar 12 fill salt and emptying, and fuse salt system has more in the past reduced the fuse salt conveying trunk line on a vertical connection cat head heat dump and ground.
Fig. 4 is an endothermic tube 1 and the connected mode schematic diagram that collects the connection pipe in the heat dump of the present invention.Every endothermic tube 1 is managed with last collection connection and being connected between 4 valve H29 can be arranged in the heat dump of the present invention, and endothermic tube 1 is managed with the next part connection can have valve M38 being connected between 3.The aperture of valve can manually be controlled, and also can realize automatic control according to the feedback signal that reads the detection of endothermic tube 1 surface temperature.This valve can in time be closed this root pipeline when certain root endothermic tube takes place to reveal, and other pipeline still can normally move.When endothermic tube 1 surface temperature was low, the aperture of valve H29 and valve M38 diminished, when the wall surface temperature of endothermic tube 1 is high, and the aperture increasing of valve H29 and valve M38.If when the leakage accident of single conduit metal molten takes place, valve H29 and valve M38 that should pipeline be closed simultaneously.If excess temperature takes place a plurality of endothermic tubes 1, so at first remove heliostat, then valve-off A8 or F15.Endothermic tube 1 can not have valve with the junction of last collection connection pipe 4, next part connection pipe 3 yet, directly connect, adapt to the unstable state of endothermic tube 1 surface distributed, non-homogeneous hot-fluid by the fuse salt Natural Circulation, endothermic tube 1 outer surface can be equipped with the heat exchange of the fin Final 16.
Fig. 5 is a heat dump cavity type structural representation of the present invention.Fig. 5 a is a cavity type heat dump schematic side view.The heat absorption surface that endothermic tube 1 is formed is positioned at the heat dump inside cavity, and heat-resisting warming plate 2 is equipped with on the heat absorption surface behind.Heat radiation reflecting plate 32 is equipped with in inner upper and lower surface of heat-absorbing chamber and left and right side.Fig. 5 b is a cavity type heat dump front elevational schematic.The heat dump cavity has only a side that opening is arranged, and opening surface is to the heliostat field, and all the other each surfaces are all sealed, and confining surface all is equipped with external thermal insulation 31.There is the layering measure that stops free convection heat-absorbing chamber inside, for example in the heat dump cavity, baffle plate parallel to the ground, vertical ground baffle plate and built-in porous media piece and orifice plate etc. are arranged in the surperficial the place ahead of absorbing heat, the air that is used for separating and weakens the heat dump inside cavity moves on a large scale, thereby weaken the heat exchange of air and endothermic tube 1, reduce the radiation loss of endothermic tube 1.External thermal insulation 31 is equipped with in the heat-absorbing chamber outside.Sunshine enters the heat dump cavity after the heliostat reflection, major part directly projects the outer surface of endothermic tube 1 towards the heliostat field, the sunshine that also has the part heliostat to reflect back directly projects on the heat radiation reflecting plate 32 of cavity inboard, projects endothermic tube 1 surface behind secondary reflection.This endothermic tube 1 arrangement form is applicable to that heliostat centers on the heliostat field that tower is fan-shaped layout.
Fig. 6 is a heat dump outlet structure schematic diagram of the present invention.Fig. 6 a is the heat-absorbing model schematic side view that endothermic tube 1 is formed through connection in series-parallel.High-temperature-resistant thermal-insulation plate 2 is equipped with on the heat absorption surface that endothermic tube 1 is formed behind.Endothermic tube 1 is fixed on the support 33.Fig. 6 b is a heat dump outlet structure schematic top plan view.The heat absorption surface arrangement that endothermic tube 1 is formed is in the cylinder support outside.The cylinder support can be a cylinder, also can be polygon prism.This arrangement form is applicable to that heliostat centers on the Jing Chang that tower is circumference.
Claims (9)
1. a passive molten salt heat sink is characterized in that this heat sink comprises endothermic tube (1), heat-resisting warming plate (2), fused salt tank (6), heat-resisting heat-insulation layer (7), next part connection pipe (3), goes up collection connection pipe (4); Fused salt tank (6) is positioned at the heat absorption surface that many endothermic tubes (1) are formed by serial or parallel connection; The heat absorption surface is over against the heliostat field, and heat-resisting warming plate (2) is equipped with on the heat absorption surface behind; Fused salt tank (6) outside parcel heat-resisting heat-insulation layer (7), the heat-resisting heat-insulation layer (7) of fused salt tank (6) and outside parcel thereof is formed high-temperature fusion salt cellar (12); Endothermic tube (1) top is a last collection connection pipe (4), last collection connection pipe (4) is connected by tedge (5) with fused salt tank (6), endothermic tube (1) below is next part connection pipe (3), and next part connection pipe (3) is connected by return duct (9) with fused salt tank (6), forms the fuse salt natural convection loop.
2. according to the said passive molten salt heat sink of claim 1, it is characterized in that high-temperature fusion salt cellar (12) comprises fused salt tank (6), heat-resisting heat-insulation layer (7), electric heater (27), valve C (11), valve A (8), valve D (13) and air bleeding valve A (18); Thermocouple (28) all is equipped with in the bottom of fused salt tank (6) and sidewall many places; A plurality of electric heaters (27) are inserted in the fused salt tank (6) by fused salt tank (6) top; Valve C (11) and valve A (8) are contained in the both sides of fused salt tank (6) respectively, and are connected with return duct (9) with tedge (5) respectively, and valve C (11) and valve A (8) open when the fuse salt Natural Circulation, constitute closed circuit; Valve D (13) is equipped with in fused salt tank (6) bottom, and air bleeding valve A (18) is equipped with at the top; Valve D (13) and air bleeding valve A (18) open when fuse salt charges into emptying; Air bleeding valve A (18) is connected with the pressure vessel of inflated with nitrogen or inert gas.
3. according to the said passive molten salt heat sink of claim 1, it is characterized in that two or more described high-temperature fusion salt cellars (12) of a described heat absorption surface engagement use, and charge and discharge heat continuously.
4. according to the said passive molten salt heat sink of claim 1, it is characterized in that there is resistant to elevated temperatures solar selectively absorbing coating on endothermic tube (1) surface; Endothermic tube (1) is arranged in the cavity, constitutes the cavity type heat dump, or is directly exposed in the environment, constitutes the external heat dump.
5. according to the said passive molten salt heat sink of claim 4, when it is characterized in that cavity type is arranged, the heat dump inside cavity has the layering measure that stops free convection.
6. according to the said passive molten salt heat sink of claim 1, it is characterized in that every endothermic tube (1) and next part connection are managed (3), upward the connection employing valve between the collection connection pipe (4) is regulated flow and switching automatically, and fin (16) is arranged outside the endothermic tube (1).
7. one kind comprises the passive endothermic system of fuse salt according to the said passive molten salt heat sink of claim 1, it is characterized in that this system also comprises salt transporting tube (21), returns salt pipe (34), goes up salt pipe (35) and valve J (22), valve I (30), valve K (36), valve L (37) and fusion salt pump (23); Wherein, heat sink is installed on the top of pylon (39), and fusion salt pump (23) is arranged on the ground of pylon (39) bottom with fuse salt heat-accumulator tank (24), and salt transporting tube (21) is arranged in pylon (39) inside; Heat exchange coil (25) is arranged at the top in fuse salt heat-accumulator tank (24); The bottom of the fused salt tank in the heat sink (6) links to each other with an end of single salt transporting tube (21) by the return duct (9) in the heat sink, the other end of single salt transporting tube (21) links to each other with an end that returns salt pipe (34) and last salt pipe (35), the other end that returns salt pipe (34) links to each other with the top of fuse salt heat-accumulator tank (24), the other end of last salt pipe (35) links to each other with the outlet of fusion salt pump (23), and the inlet of fusion salt pump (23) links to each other by the bottom of pipeline with fuse salt heat-accumulator tank (24); Valve K (36) is installed on the salt transporting tube (21), and valve I (30) is installed on the salt pipe (35), and valve J (22) is installed in back on the salt pipe (34), and valve L (37) is installed on the pipeline between fusion salt pump (23) and the fuse salt heat-accumulator tank (24).
8. according to the passive endothermic system of the said fuse salt of claim 7, it is characterized in that three-way valve replacement valve J (22), the valve I (30) and the valve K (36) that are arranged on salt transporting tube (21), go back to the junction of salt pipe (34) and last salt pipe (35) with one.
9. according to the passive endothermic system of the said fuse salt of claim 7, it is characterized in that fused salt tank (6), tedge (5), return duct (9), salt transporting tube (21), last salt pipe (35), time salt pipe (34) all have auxiliary heating and heat-insulating device, the no auxiliary electrical heating and heat-insulating device of endothermic tube (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810102397XA CN101298944B (en) | 2008-03-21 | 2008-03-21 | Passive molten salt thermal absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810102397XA CN101298944B (en) | 2008-03-21 | 2008-03-21 | Passive molten salt thermal absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101298944A CN101298944A (en) | 2008-11-05 |
| CN101298944B true CN101298944B (en) | 2010-12-22 |
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| CN200810102397XA Expired - Fee Related CN101298944B (en) | 2008-03-21 | 2008-03-21 | Passive molten salt thermal absorber |
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| ES2363288B1 (en) * | 2010-01-15 | 2012-02-27 | Abengoa Solar New Technologies S.A. | SOLAR RECEIVER OF FOUNDED SALTS AND PROCEDURE TO REDUCE THERMAL GRADIENT IN SUCH RECEPTOR. |
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| CN102928566B (en) * | 2012-11-22 | 2015-08-19 | 淮南中科储能科技有限公司 | Test high-temperature molten salt loop |
| CN103644664B (en) * | 2013-12-18 | 2016-01-20 | 中国科学院电工研究所 | Ultrasound-enhanced cold the filling of molten salt thermal absorber is put |
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