US20140041600A1 - Thermal-energy-storage tank with integrated steam generator - Google Patents

Thermal-energy-storage tank with integrated steam generator Download PDF

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Publication number
US20140041600A1
US20140041600A1 US13/992,109 US201113992109A US2014041600A1 US 20140041600 A1 US20140041600 A1 US 20140041600A1 US 201113992109 A US201113992109 A US 201113992109A US 2014041600 A1 US2014041600 A1 US 2014041600A1
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US
United States
Prior art keywords
shell
thermovector fluid
thermal
store
containing structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/992,109
Other languages
English (en)
Inventor
Luca Rinaldi
Fabrizio Fabrizi
Alessandro Alemberti
Walter Gaggioli
Salvatore Aliotta
Andrea Barbensi
Pietro Tarquini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA
Ansaldo Nucleare SpA
Original Assignee
Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA
Ansaldo Nucleare SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA, Ansaldo Nucleare SpA filed Critical Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA
Assigned to ANSALDO NUCLEARE S.P.A., AGENZIA NAZIONALE PER LE NUOVE TECNOLOGI, L'ENERGIA E LO SVILUPPO ECONOMICO SOSTENIBILE (ENEA) reassignment ANSALDO NUCLEARE S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FABRIZI, FABRIZIO, GAGGIOLI, WALTER, RINALDI, LUCA, TARQUINI, PIETRO, ALEMBERTI, ALESSANDRO, ALIOTTA, SALVATORE, BARBENSI, ANDREA
Publication of US20140041600A1 publication Critical patent/US20140041600A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/004—Accumulation in the liquid branch of the circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/14—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having both steam accumulator and heater, e.g. superheating accumulator
    • F01K3/16—Mutual arrangement of accumulator and heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/028—Steam generation using heat accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00—Steam boilers of forced-flow type
    • F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
    • 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
    • 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
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Definitions

  • the present invention relates to a thermal-energy storage tank with integrated steam generator.
  • the present invention regards a tank for storing molten salts that are stratified in temperature with an integrated steam generator to which the ensuing description will make explicit reference without this implying any loss of generality.
  • plants for producing thermal energy by using molten salts are substantially constituted by means for heating the molten salts, by a hot tank provided for keeping the molten salts at a high temperature (approximately 550° C.), by a steam generator that is traversed by the salts coming from the hot tank, and by a cold tank, in which the cold molten salts (at a temperature of approximately 290° C.) are stored after they have left the steam generator.
  • a type of plant of this sort entails the presence of numerous components, which results in a high running cost due both to maintenance and replacement of the components themselves and to maintenance of an effective and safe transport of the molten salts.
  • the plants described above necessarily envisage the presence of numerous external pipes, in which the molten salts must be kept at a given pressure and at a given operating temperature in order not to jeopardize the effectiveness of the process as a whole.
  • thermovector fluid a component that, by using a thermovector fluid, will enable production of steam with a saving in costs and space as compared to the known art.
  • the subject of the present invention is a thermal-energy storage tank for a thermovector fluid in the liquid phase, the basic characteristics of which are specified in Claim 1 , and the preferred and/or auxiliary characteristics of which are specified in Claims 2 - 7 .
  • a further object of the present invention is a method for producing steam, the basic characteristics of which are specified in claim 8 , and the preferred and/or auxiliary characteristics of which are specified in Claims 9 - 12 .
  • FIG. 1 is a cross-sectional view of a preferred embodiment of the thermal-energy storage tank forming the subject of the present invention
  • FIG. 2 a is a side view with parts in cross section of a preferred embodiment of the steam generator comprised in the tank of FIG. 1 ;
  • FIG. 2 b is a side view from an angle rotated through 90° of the steam generator of FIG. 2 a with parts in cross section.
  • FIG. 1 Designated as a whole by 1 in FIG. 1 is a thermal-energy storage tank according to the present invention.
  • the tank 1 comprises a containing structure 2 , which has a number of openings (a first opening 3 and a second opening 4 are shown in the figure) made in a top cap 5 thereof.
  • the tank 1 comprises a regenerating circuit 6 for heating a thermovector fluid and for thermal storage, which in the case in point is constituted by a mixture of molten salts constituted for 60% by sodium nitrate and for 40% by potassium nitrate, but which can be even constituted by other types of mixtures of salts or fluid a with high thermal capacity.
  • cold molten salts the mixture defined above at a temperature of approximately 290° C.
  • hot molten salts the mixture defined above at a temperature of approximately 550° C.
  • the regenerating circuit 6 in turn comprises an intake pump 7 , the intake mouth of which 8 is housed in the proximity of the bottom of the containing structure 2 , a pipe 9 for intake of the cold molten salts arranged so as to traverse the first opening 3 and of which a first part 9 a is housed inside and a second part 9 b is housed outside the containing structure 2 , a pipe 10 for pouring the hot molten salts, which is also arranged so as to traverse the first opening 3 and of which a first part 10 a is housed outside and a second part 10 b is housed inside the containing structure 2 , and means for heating the molten salts designated as a whole by 11 and set between the intake pipe 9 and the pouring pipe 10 .
  • the heating means 11 can be identified, by way of example, by a solar concentrator (e.g., a field of linear parabolic mirrors) or with a biomass boiler.
  • a solar concentrator e.g., a field of linear parabolic mirrors
  • a biomass boiler e.g., a biomass boiler
  • the intake pipe 9 , the pouring pipe 10 , and the set of electrical components of the pump 7 traverse a flange set so as to close the first opening 3 to guarantee insulation from outside of the molten salts set inside the containing structure 2 .
  • cold molten salts is meant the mixture defined above at a temperature of approximately 290° C.
  • hot molten salts is meant the mixture defined above at a temperature of approximately 550° C.
  • the molten salts arrange themselves within the containing structure 2 according to a temperature gradient, whereby the cooler molten salts arrange themselves on the bottom of the containing structure and the hotter molten salts arrange themselves on the surface of the store of molten salts present in the containing structure 2 .
  • the tank 1 comprises a steam generator 13 housed inside the containing structure 2 .
  • the steam generator 13 comprises a cylindrical shell 14 , practically completely immersed in use in the molten salts, a diffuser 15 connected in a fluid-tight way to a bottom end 14 a of the shell 14 , and three water/steam tubes 16 .
  • Each of the tubes 16 is constituted by a delivery portion 16 a, from which the under-cooled water enters at a temperature of 240° C., a heat-exchange portion 16 b with helical conformation, housed inside, and coaxial with, the shell 14 , and a return portion 16 c, through which the superheated steam comes out at a temperature of 520° C.
  • FIG. 2 a visible in cross-sectional view are a portion 16 a and a portion 16 c , whereas visible in FIG. 2 b in cross-sectional view are two portions 16 a.
  • the portions 16 c are visible both entirely and in cross-sectional view in FIG. 2 a.
  • the respective delivery portions 16 a and return portions 16 c traverse a flange 17 set for closing the second opening 4 in order, as described above in connection to the flange 12 , to guarantee insulation of the molten salts set inside the containing structure 2 from the outside world.
  • the various delivery portions 16 a and return portions 16 c of the tubes 16 can be replaced, respectively, by a single delivery header and a single return header.
  • the tube nest in which there takes place heat exchange with the molten salts, has a first end that branches off from the delivery header for the under-cooled water and a second end that converges in a return header for the steam. In this way, both the delivery header and the return header traverse the flange 17 .
  • a plurality of openings 18 are made in the proximity of a top end 14 b of the shell 14 itself.
  • the steam generator 13 will be housed in the containing structure 2 in such a way that the openings 18 will be at the level of the hot molten salts, and the diffuser 15 will be at the level of the cold molten salts.
  • the hot molten salts enter the shell 14 through the openings 18 and exit therefrom as cold molten salts from the diffuser 15 after having performed their function as primary fluid in the heat-exchange process.
  • the ensemble constituted by the shell 14 and the heat-exchange portions 16 b defines as a whole a tube-nest heat exchanger and shell.
  • each of the tubes 16 the delivery portion 16 a extends linearly from the outside of the containing structure 2 as far as the bottom end 14 a of the shell 14
  • the heat-exchange portion 16 b extends in a helical conformation from the bottom end 14 a of the shell 14 as far as the openings 18
  • the return portion 16 c extends in a linear conformation from the openings 18 and exits from the containing structure 2 through the flange 17 to reach the utilizer provided for the production of energy, such as, for example, a turbine.
  • the hot molten salts enter through the openings 18 within the shell 14 and surround the three heat-exchange portions 16 b to perform thermal exchange with the water that flows therein.
  • the molten salts flow from top downwards yielding heat to the water that flows in countercurrent from the bottom up along the heat-exchange portions 16 b.
  • the molten salts, during the process of heat exchange, are gradually cooled, thus becoming more heavier and descending towards the diffuser 15 to come out therefrom at a temperature equal to the temperature of the molten salts present at the level where the diffuser 15 itself gives out.
  • the steam generator 13 comprises a component, which, by promoting motion of the molten salts, contributes to onset of the natural circulation thereof.
  • said component is a propeller 19 housed upstream of the diffuser 15 and moved by an actuation rod 20 , which extends axially with respect to the helical heat-exchange portions 16 b and then outside the containing structure 2 through the flange 17 .
  • the steam generator 13 further comprises a first thermal-insulation cladding 21 set around the shell 14 and a second thermal-insulation jacket 22 set inside the heat-exchange portions 16 b and outside the delivery portions 16 a.
  • the thermal-insulation jackets 21 and 22 are obtained by filling the annular gap that they create with alumina balls of 5 mm in diameter immersed in stationary molten salts.
  • the balls of alumina which is a good thermally insulating material to which the stationary molten salts are equivalent as regards thermal conductivity, have the purpose of improving prevention of flow of the molten salts themselves.
  • the purpose of the insulation jackets is to insulate, respectively, the molten salts that flow within the shell 14 , in order to guarantee heat exchange thereof exclusively with the water that flows within the heat-exchange portions 16 b, and the water that flows in the delivery portions 16 a, so that the water will not undergo a heating process during its inlet path.
  • the tank forming the subject of the present invention guarantees the production of superheated steam by means of a steam generator without the need to provide external circuits for inlet and outlet of the thermovector fluid.
  • the stratification of the molten salts guarantees the possibility of using a single containing structure for the hot molten salts and for the cold molten salts without the heat of the former being yielded by convection to the latter. It is thus possible to exploit the stratification in temperature of the molten salts immersing therein the steam generator with vertical development in a position such as to receive in the generator the molten salts at the level in which these are hot and release them at the level in which they are cold.
  • thermovector fluid plays an essential role also inside the steam generator.
  • the molten salts penetrate into the shell 14 through the openings 18 and, by natural circulation in so far as they cool down and become heavier, traverse with a motion from top downwards the shell 14 itself yielding heat to the water that flows in countercurrent in the heat-exchange portions 16 b .
  • Within the steam generator 13 there is thus no need to force in any way advance of the molten salts in so far as this takes place in a natural way.
  • the steam generator In order to prevent any convective motion that might disturb the stratification referred to above, the steam generator must be designed in such a way that the molten salts will exit from the steam generator with a temperature equal to the temperature present at the level of the diffuser from which they physically come out.
  • the diffuser 15 must be designed in such a way as to minimize the movements of the fluid stored on the bottom of the containing structure 2 to prevent the possible onset of undesirable motions of mixing of the thermal stratification in the stored mass.
  • the only external circuit provided by the tank forming the subject of the present invention is constituted by the regenerating circuit 6 whereby a constant production of hot molten salts is guaranteed.
  • the cold molten salts are taken from the bottom of the containing structure 2 to undergo a heating treatment provided, for example, by means of a set of solar concentrators, and are then fed back into the containing structure 2 to be deposited almost on the surface of the molten salts, i.e., where these are hotter.
  • the tank according to the present invention can comprise a plurality of steam generators which are independent of one another and are housed in one and the same containing structure. In this way, using always a single tank in which the thermovector fluid stratifies in temperature, the production of superheated steam, and, consequently, the energy that it is possible to produce with said steam is multiplied.
  • thermovector fluid is introduced into the structure 2 in a region corresponding to other stratified thermovector fluid having the same temperature.
  • the tank of the present invention is then provided with particular structures (“traps”) set on its internal walls, in order to trap the molten salt in the vicinity of the walls themselves and prevent them from flowing, thus exploiting the good thermal-insulation properties of the stationary molten salts to provide a heat shield that will minimize the losses of heat towards the outside of the tank itself.
  • traps set on its internal walls, in order to trap the molten salt in the vicinity of the walls themselves and prevent them from flowing, thus exploiting the good thermal-insulation properties of the stationary molten salts to provide a heat shield that will minimize the losses of heat towards the outside of the tank itself.
  • the thermal-energy storage tank forming the subject of the present invention enables reduction both of the number of components (a single tank and a single molten-salt circuit) and of the pressurized apparatuses, consequently reducing both the plant costs and the corresponding problems of maintenance and/or replacement. In addition, it guarantees a greater compactness of the plant as a whole, thus leading to a better use of the necessary spaces.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Central Heating Systems (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
US13/992,109 2010-12-14 2011-12-14 Thermal-energy-storage tank with integrated steam generator Abandoned US20140041600A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITRM2010A000660A IT1403133B1 (it) 2010-12-14 2010-12-14 Serbatoio di accumulo di energia termica con generatore di vapore integrato
ITRM2010A000660 2010-12-14
PCT/IB2011/055676 WO2012080970A2 (en) 2010-12-14 2011-12-14 Thermal-energy- storage tank with integrated steam generator

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US20140041600A1 true US20140041600A1 (en) 2014-02-13

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US13/992,109 Abandoned US20140041600A1 (en) 2010-12-14 2011-12-14 Thermal-energy-storage tank with integrated steam generator

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US (1) US20140041600A1 (es)
EP (1) EP2652272B1 (es)
CY (1) CY1117229T1 (es)
ES (1) ES2558476T3 (es)
IT (1) IT1403133B1 (es)
WO (1) WO2012080970A2 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105066083A (zh) * 2015-09-11 2015-11-18 中山大学 U型列管式熔盐蒸汽发生装置及方法
US20190170449A1 (en) * 2017-12-03 2019-06-06 John Potee Whitney Molten-salt-heated indirect screw-type thermal processor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014202846A1 (de) 2014-02-17 2015-08-20 Siemens Aktiengesellschaft Verfahren und Vorrichtung zum Entladen eines thermischen Schichtspeichers
DE102022000765A1 (de) 2022-03-04 2023-09-07 Alexander Lapin Das Energiewärmespeicherkraftwerk

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033814A (en) * 1974-08-30 1977-07-05 Commissariat A L'energie Atomique Thermogenic swimming-pool type nuclear reactor
US4045286A (en) * 1974-12-24 1977-08-30 Electricite De France (Service National) Molten fuel-salt reactor
US4645633A (en) * 1983-09-08 1987-02-24 Central Research Institute Of Electric Power Industry, Toshiba Corporation Double tank type fast breeder reactor
US20040099261A1 (en) * 2002-11-22 2004-05-27 Litwin Robert Zachary Expansion bellows for use in solar molten salt piping and valves
US6944255B2 (en) * 2001-07-10 2005-09-13 Central Research Institute Of Electric Power Industry Nuclear reactor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5384489A (en) * 1994-02-07 1995-01-24 Bellac; Alphonse H. Wind-powered electricity generating system including wind energy storage
KR100573744B1 (ko) * 2003-03-17 2006-04-25 한국원자력연구소 액체금속로용 증기발생기와 이의 전열방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033814A (en) * 1974-08-30 1977-07-05 Commissariat A L'energie Atomique Thermogenic swimming-pool type nuclear reactor
US4045286A (en) * 1974-12-24 1977-08-30 Electricite De France (Service National) Molten fuel-salt reactor
US4645633A (en) * 1983-09-08 1987-02-24 Central Research Institute Of Electric Power Industry, Toshiba Corporation Double tank type fast breeder reactor
US6944255B2 (en) * 2001-07-10 2005-09-13 Central Research Institute Of Electric Power Industry Nuclear reactor
US20040099261A1 (en) * 2002-11-22 2004-05-27 Litwin Robert Zachary Expansion bellows for use in solar molten salt piping and valves

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105066083A (zh) * 2015-09-11 2015-11-18 中山大学 U型列管式熔盐蒸汽发生装置及方法
US20190170449A1 (en) * 2017-12-03 2019-06-06 John Potee Whitney Molten-salt-heated indirect screw-type thermal processor
US11193719B2 (en) * 2017-12-03 2021-12-07 John Potee Whitney Molten-salt-heated indirect screw-type thermal processor

Also Published As

Publication number Publication date
ES2558476T3 (es) 2016-02-04
IT1403133B1 (it) 2013-10-04
ITRM20100660A1 (it) 2012-06-15
CY1117229T1 (el) 2017-04-05
EP2652272A2 (en) 2013-10-23
WO2012080970A3 (en) 2012-08-09
EP2652272B1 (en) 2015-10-28
WO2012080970A2 (en) 2012-06-21

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