DE2336911C3 - Heat storage or heat transport means - Google Patents
Heat storage or heat transport meansInfo
- Publication number
- DE2336911C3 DE2336911C3 DE2336911A DE2336911A DE2336911C3 DE 2336911 C3 DE2336911 C3 DE 2336911C3 DE 2336911 A DE2336911 A DE 2336911A DE 2336911 A DE2336911 A DE 2336911A DE 2336911 C3 DE2336911 C3 DE 2336911C3
- Authority
- DE
- Germany
- Prior art keywords
- mol
- heat
- lif
- naf
- mgf
- 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.)
- Expired
Links
- 238000005338 heat storage Methods 0.000 title claims description 11
- 239000011833 salt mixture Substances 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 8
- 230000005496 eutectics Effects 0.000 claims description 5
- 239000006163 transport media Substances 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 20
- 230000004927 fusion Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000374 eutectic mixture Substances 0.000 description 4
- 239000000155 melt Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
Die Erfindung betrifft ein Wärmespeicher- oder Wärmetransportmittel mit Phasenübergang fest-flüssig oder umgekehrt, bestehend aus einer quaternären eutektischen Salzmischung aus dem System LiF-KF-NaF-MgF2. The invention relates to a heat storage or heat transport medium with a solid-liquid phase transition or vice versa, consisting of a quaternary eutectic salt mixture from the LiF-KF-NaF-MgF 2 system .
Wärmespeichermittel werden z. B. in Sonnenkraftwerken und in Speicherofen angewendet. Wärmetransportmittel finden z. B. in Kernreaktoren und in Salzbädern zur Wärmbehandlung Anwendung.Heat storage means are z. B. used in solar power plants and in storage stoves. Means of heat transfer find z. B. in nuclear reactors and in salt baths for heat treatment application.
Ein Wärmespeichermittel der eingangs genannten Art ist aus der DE-OS 2140860 bekannt. Die Schmelzpunkte der darin erwähnten eutektischen Salzmischungen liegen zwischen 615 und 746° C. Es besteht jedoch in der Technik ein Bedarf an Wärmespeicher- und Wärmetransportmitteln mit einem Schmelzpunkt zwischen 400 und 500° C, die eine möglichst große Schmelzwärme und Wärmekapazität besitzen und die gegen gebräuchliche Gefäßmaterialien, z. B. Chrom-Nickel-Stahl, nicht korrosiv sind.A heat storage means of the type mentioned is known from DE-OS 2140860. the Melting points of the eutectic salt mixtures mentioned therein are between 615 and 746 ° C. Es however, there is a need in the art for heat storage and transport media having a Melting point between 400 and 500 ° C, which has the greatest possible heat of fusion and heat capacity own and against common vessel materials such. B. chrome-nickel steel, are not corrosive.
Aus der DE-OS 1579625 sind ein ternäres eutektisches Gemisch aus 46,5 Mol% LiF, 42,0 Mol% KF und 11,5 Mol % NaF, das bei 454° C schmilzt und eineFrom DE-OS 1579625 are a ternary eutectic Mixture of 46.5 mol% LiF, 42.0 mol% KF and 11.5 mol% NaF, which melts at 454 ° C and a
Schmelzwärme von etwa 685 J/ghat, und eine quaternäre Salzmischung aus 44,9 Mol% LiF, 40,6 Mol% KF, 11,5 Mol% NaF und 3 MoI % CaF2 mit einem Schmelzpunkt von 444° C und einer Schmelzwärme von etwa 668 J/g als Wärmespeichermittel bekannt. Insbesondere bei Kraftwerken, z. B. Sonnenkraftwerken, werden derartige Salzmischungen in enorm großen Mengen benötigt. Der ziemlich hohe Preis und die reiative Seltenheit des Lithiumfluorids stellt daher ein schwerwiegendes Hindernis für die Anwendung dieser Salzmischungen dar.Heat of fusion of about 685 J / ghat, and a quaternary salt mixture of 44.9 mol% LiF, 40.6 mol% KF, 11.5 mol% NaF and 3 mol% CaF 2 with a melting point of 444 ° C and a heat of fusion of about 668 J / g known as a heat storage agent. Especially in power plants, e.g. B. solar power plants, such salt mixtures are required in enormous quantities. The rather high price and relative rarity of lithium fluoride therefore represent a serious obstacle to the use of these salt mixtures.
Die Erfindung hat die Aufgabe, Wärmespeicheroder Wärmetransportmittel mit einem eutektischen Schmelzpunkt zwischen 400 und 500° C zu schaffen, die einen niedrigen Lithiumfluoridgehalt und eine große Schmelzwärme aufweisen.The invention has the task of providing heat storage or heat transport means with a eutectic Melting point between 400 and 500 ° C to create a low lithium fluoride content and a have great heat of fusion.
Diese Aufgabe wird erfindungsgemäß durch ein Wärmespeicher- oder Wärmetransportmittel gelöst, das aus etwa 44 MoI % LiF, etwa 40 MoI % KF, etwa 12 Mol% NaF und etwa 4 Mol% MgF2 besteht.According to the invention, this object is achieved by a heat storage or heat transport medium which consists of about 44 mol% LiF, about 40 mol% KF, about 12 mol% NaF and about 4 mol% MgF 2 .
Der Schmelzpunkt dieser eutektischen Mischung beträgt etwa 449 ° C. Die Schmelzwärme beträgt etwa 701 J/g und ist damit um etwa 2,5% größer als die der bekannten eutektischen Mischung aus LiF, KF und NaF. Bei gleicher Speicherkapazität an Schmelzwärme kann man also erfindungsgemäß mit einer geringeren Menge an Salzmischung als bei der bekannten Mischung auskommen. Überdies enthält die erfindungsgemäße Mischung weniger LiF, dies bedeutet eine Ersparnis an teuerem LiF.The melting point of this eutectic mixture is about 449 ° C. The heat of fusion is about 701 J / g and is thus around 2.5% larger than that of the known eutectic mixture of LiF, KF and NaF. With the same storage capacity of heat of fusion, according to the invention, one can therefore use a lower one Amount of salt mixture than with the known mixture. In addition, the Mixture according to the invention less LiF, this means a saving in expensive LiF.
Die neue Salzmischung wird vorzugsweise wie folgt hergestellt: Es wird eine Salzmischung dargestellt, die 44Mol%±2Mol%LiFThe new salt mixture is preferably prepared as follows: A salt mixture is presented which 44 mol% ± 2 mol% LiF
12Mol%± 1 Mol % NaF12 mol% ± 1 mol% NaF
40 MoI % ± 2 Mo! % KF und40 MoI% ± 2 Mo! % KF and
4Mol%± 1 MoI % MgF2 4 mol% ± 1 mol% MgF 2
enthält. Die Mischung wird so lange wiederholt geschmolzen und erstarren gelassen, bis eine unterhalb 450° C schmelzende klare Schmelze erhalten wird. Die Schmelze wird gegebenenfalls von einem bei dieser Temperatur nicht geschmolzenen Rückstand abgegossen und abgekühlt. Die Zusammensetzung der Schmelze entspricht nun der eutektischen Mischung mit der ungefähren Zusammensetzung 44 Mol% LiF, 40 MoI % KF, 12 Mol% NaF und 4 Mol% MgF2.contains. The mixture is repeatedly melted and allowed to solidify until a clear melt melting below 450 ° C. is obtained. If necessary, the melt is poured off from a residue that is not melted at this temperature and cooled. The composition of the melt now corresponds to the eutectic mixture with the approximate composition of 44 mol% LiF, 40 mol% KF, 12 mol% NaF and 4 mol% MgF 2 .
Die Salzmischung kann als Wärmespeichermittel und als Wärmetransportmittel Anwendung finden. Die Mischung ist chemisch stabil, nicht brennbar und gegen Chrom-Nickel-Stähle nicht korrosiv; sie entwickelt beim Gebrauch keine Dämpfe, was für die Anwendung in geschlossenen Behältern von Bedeutung ist.The salt mixture can be used as a heat storage medium and as a heat transport medium. The mixture is chemically stable, non-flammable and non-corrosive to chrome-nickel steels; she developed no vapors during use, which is important for use in closed containers is.
Claims (3)
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2336911A DE2336911C3 (en) | 1973-07-20 | 1973-07-20 | Heat storage or heat transport means |
| FR7424647A FR2237947B1 (en) | 1973-07-20 | 1974-07-16 | |
| NL7409596A NL7409596A (en) | 1973-07-20 | 1974-07-16 | QUATERNARY EUTECTIC LIF CONTAINING SALT MIXTURE |
| AU71315/74A AU490154B2 (en) | 1973-07-20 | 1974-07-17 | Quaternary eutectic salt mixture containing lif |
| GB3166674A GB1470405A (en) | 1973-07-20 | 1974-07-17 | Quaternary eutectic salt mixture |
| SE7409332A SE398888B (en) | 1973-07-20 | 1974-07-17 | QUATERE EUTEKTIC SALT MIXTURE CONTAINING LIFE |
| JP8126374A JPS5436916B2 (en) | 1973-07-20 | 1974-07-17 | |
| IE1518/74A IE40925B1 (en) | 1973-07-20 | 1974-07-17 | Quaternary eutectic salt mixture |
| CA204,991A CA1046261A (en) | 1973-07-20 | 1974-07-18 | Quaternary eutectic salt mixture containing lif |
| BE146712A BE817829A (en) | 1973-07-20 | 1974-07-18 | QUATERNARY EUTECTIC SALT MIX CONTAINING LIF |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2336911A DE2336911C3 (en) | 1973-07-20 | 1973-07-20 | Heat storage or heat transport means |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2336911A1 DE2336911A1 (en) | 1975-02-06 |
| DE2336911B2 DE2336911B2 (en) | 1979-07-05 |
| DE2336911C3 true DE2336911C3 (en) | 1980-03-06 |
Family
ID=5887494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2336911A Expired DE2336911C3 (en) | 1973-07-20 | 1973-07-20 | Heat storage or heat transport means |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5436916B2 (en) |
| BE (1) | BE817829A (en) |
| CA (1) | CA1046261A (en) |
| DE (1) | DE2336911C3 (en) |
| FR (1) | FR2237947B1 (en) |
| GB (1) | GB1470405A (en) |
| IE (1) | IE40925B1 (en) |
| NL (1) | NL7409596A (en) |
| SE (1) | SE398888B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3247968A1 (en) * | 1982-12-24 | 1984-06-28 | Brown, Boveri & Cie Ag, 6800 Mannheim | Thermal insulation |
| JP2578724B2 (en) * | 1993-12-29 | 1997-02-05 | 敏信 山下 | Outer diameter measuring device such as ERW pipe |
| RU2703220C1 (en) * | 2018-11-15 | 2019-10-15 | Федеральное Государственное Бюджетное Учреждение Науки "Институт проблем геотермии" Дагестанского научного центра Российской Академии наук | Heat accumulating material |
-
1973
- 1973-07-20 DE DE2336911A patent/DE2336911C3/en not_active Expired
-
1974
- 1974-07-16 NL NL7409596A patent/NL7409596A/en unknown
- 1974-07-16 FR FR7424647A patent/FR2237947B1/fr not_active Expired
- 1974-07-17 JP JP8126374A patent/JPS5436916B2/ja not_active Expired
- 1974-07-17 SE SE7409332A patent/SE398888B/en unknown
- 1974-07-17 IE IE1518/74A patent/IE40925B1/en unknown
- 1974-07-17 GB GB3166674A patent/GB1470405A/en not_active Expired
- 1974-07-18 CA CA204,991A patent/CA1046261A/en not_active Expired
- 1974-07-18 BE BE146712A patent/BE817829A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB1470405A (en) | 1977-04-14 |
| SE398888B (en) | 1978-01-23 |
| DE2336911B2 (en) | 1979-07-05 |
| FR2237947A1 (en) | 1975-02-14 |
| JPS5033985A (en) | 1975-04-02 |
| BE817829A (en) | 1975-01-20 |
| IE40925B1 (en) | 1979-09-12 |
| DE2336911A1 (en) | 1975-02-06 |
| FR2237947B1 (en) | 1978-01-20 |
| CA1046261A (en) | 1979-01-16 |
| NL7409596A (en) | 1975-01-22 |
| SE7409332L (en) | 1975-01-21 |
| AU7131574A (en) | 1976-01-22 |
| IE40925L (en) | 1975-01-20 |
| JPS5436916B2 (en) | 1979-11-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OD | Request for examination | ||
| C3 | Grant after two publication steps (3rd publication) | ||
| 8339 | Ceased/non-payment of the annual fee |