CN103849358A - Molten salt composition - Google Patents

Molten salt composition Download PDF

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CN103849358A
CN103849358A CN201210566647.1A CN201210566647A CN103849358A CN 103849358 A CN103849358 A CN 103849358A CN 201210566647 A CN201210566647 A CN 201210566647A CN 103849358 A CN103849358 A CN 103849358A
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fused salt
salt composition
nano
kno
lino
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CN103849358B (en
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林景正
王立华
黄天恒
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Industrial Technology Research Institute ITRI
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Abstract

The invention provides a molten salt composition comprising: 15 to 26wt% LiNO3(ii) a 12 to 21wt% NaNO3(ii) a 43 to 53wt% KNO3(ii) a And 3 to 29wt% of Ba (NO)3)2Or 2 to 10wt% CsNO3

Description

Fused salt composition
[technical field]
The present invention relates to fused salt composition, relate more specifically to the application of fused salt composition aspect solar energy generating.
[background technology]
Solar thermal energy power generation system needs a large amount of fused salts, using as heat energy medium.Fused salt cost accounts for 40 ~ 50% of heat storage system.In other words,, if can promote molten salt nature as reduced its fusing point, increase its specific heat and increasing its stability, can reduce cost of electricity-generating.
Current commercially available fused salt comprises nitrate composition the NaNO that comprises 60wt% 3kNO with 40wt% 3, its fusing point is 220 DEG C, the specific heat (thermal capacity) of 25 DEG C is 1.3398J/gK, and the specific heat of 350 DEG C is 1.55J/gK.Commercially available fused salt is as the nitrate composition that Dow sold, the KNO that comprises 53wt% 3, 7wt% NaNO 3, with the NaNO of 40wt% 2, its fusing point is 142 DEG C.Commercially available fused salt is as the nitrate composition that Dow sold, the KNO that comprises 45wt% 3, 7wt% NaNO 3, with the Ca (NO of 48wt% 3) 2, its fusing point is 120 DEG C.
United States Patent (USP) 7,588, the LiNO that the 694 nitrate compositions that disclose comprise 13wt% to 21wt% 3, 9wt% to 18wt% NaNO 3, 40wt% to 52wt% KNO 3, and the Ca (NO of 20wt% to 27wt% 3) 2, its fusing point <100 DEG C, thermostability >500 DEG C.United States Patent (USP) 7,922,931 nitrite and the nitrate compositions that disclose comprise LiNO 3, NaNO 3, KNO 3, NaNO 2, and KNO 2, wherein Li accounts for 20mol% to 33.5mol%, and Na accounts for 18.6mol% to 40mol%, and K accounts for 40mol% to 50.3mol%, NO 3account for 36mol% to 50mol%, and NO 2account for 50mol% to 62.5mol%, its fusing point is between 70 DEG C to 80 DEG C.
In sum, the exploitation of fused salt is at present attached most importance to raising thermostability mainly with reducing fusing point.But in the application of solar thermal energy generating, the specific heat (thermal capacity) of fused salt is more important than fusing point.For instance, if can make fused salt specific heat double, the heat energy that fused salt of same amount can store also doubles, and can significantly reduce the cost of solar thermal energy generating.In other words, need at present the fused salt composition of high specific heat badly.
[summary of the invention]
One embodiment of the invention provides a kind of fused salt composition, comprising: the LiNO of 15wt% to 26wt% 3; The NaNO of 12wt% to 21wt% 3; The KNO of 43wt% to 53wt% 3; And the Ba (NO of 3wt% to 29wt% 3) 2or the CsNO of 2wt% to 10wt% 3.
[embodiment]
The fused salt composition that one embodiment of the invention provides comprises: the LiNO of 15wt% to 26wt% 3; The NaNO of 12wt% to 21wt% 3; The KNO of 43wt% to 53wt% 3; And the Ba (NO of 3wt% to 29wt% 3) 2or the CsNO of 2wt% to 10wt% 3, namely (1) LiNO 3, NaNO 3, KNO 3, with Ba (NO 3) 2composition; And (2) LiNO 3, NaNO 3, KNO 3, and CsNO 3composition.Above-mentioned fused salt composition has high specific heat (>1.5J/gK), and (fusing point is approximately 110 DEG C to 130 DEG C with broad liquid scope, thermal stable temperature up to 550 DEG C to 570 DEG C), be suitable for as heat transfer medium and heat-storing medium, to be applied to solar thermal energy generating, or the generating of collocation tradition is as thermal power generation or nuclear energy power generation etc., please refer to Hybrid Solar Thermal Power Plant (data source: the World Bank).If it should be noted that, the ratio of a certain salt in fused salt composition exceeds above-mentioned scope, i.e. the physical property of the deteriorated fused salt composition of possibility, such as reducing specific heat or reduction liquid scope.
For above and other object of the present invention, feature and advantage can be become apparent, multiple embodiment cited below particularly are described in detail below:
[embodiment]
Following LiNO 3, NaNO 3, KNO 3, Ba (NO 3) 2with CsNO 3purchased from J.T.Baker Chemicals.According to stoichiometric ratio, take above-mentioned salt and be placed in process furnace, be heated to maintain after 150 DEG C 4 hours to remove the moisture content in fused salt composition with electricradiator, reheat to maintaining 8 hours after 400 DEG C it is evenly mixed.So far obtain fused salt composition, outward appearance is at room temperature clear, colorless or opaque white color, and at high temperature the outward appearance of (>140 DEG C) is clear, colorless.Fused salt with visual observation heating has good mobility, so viscosity does not obviously increase.
Thermopair can be in order to measure the fusing point of fused salt composition.To change liquid temperature completely into be so-called fusing point to fused salt in heat-processed by solid-state, and in process of cooling, start to occur that solid-state temperature is so-called zero pour.
Thermogravimetric analyzer (TGA, model Labsys of Setarm Instrumentation) can be in order to measure the thermal stable temperature of fused salt composition.Under controlled atmosphere, heat fused salt, the weight of continuously measured fused salt.In the time exceeding thermal stable temperature, fused salt will resolve into gas gas-phase objects and weight reduction.
Differential scanning calorimeter (DSC, model Q20 of TA Instruments) can be in order to measure the specific heat of fused salt composition.Measure the specific heat of fused salt composition according to ASTM-E1269 specification (Standard Test Method for DeterminingSpecific Heat Capacity by Differential Scanning Calorimetry).
Embodiment 1
Get the LiNO of 16wt% 3, 13wt% NaNO 3, 43mol% KNO 3ba (NO with 28wt% 3) 2after mixing, be heated to maintain after 150 DEG C 4 hours to remove the moisture content in fused salt composition, reheat to maintaining 8 hours after 400 DEG C it is evenly mixed.The fusing point of above-mentioned molten salt mixture, zero pour, thermal stable temperature, specific heat (at 150 DEG C) are as shown in table 1.
Embodiment 2
Get the LiNO of 26wt% 3, 20wt% NaNO 3, 51wt% KNO 3ba (NO with 3wt% 3) 2after mixing, be heated to maintain after 150 DEG C 4 hours to remove the moisture content in fused salt composition, reheat to maintaining 8 hours after 400 DEG C it is evenly mixed.The fusing point of above-mentioned molten salt mixture, zero pour, thermal stable temperature, specific heat (at 150 DEG C) are as shown in table 1.
Embodiment 3
Get the LiNO of 22wt% 3, 18wt% NaNO 3, 50wt% KNO 3ba (NO with 10wt% 3) 2after mixing, be heated to maintain after 150 DEG C 4 hours to remove the moisture content in fused salt composition, reheat to maintaining 8 hours after 400 DEG C it is evenly mixed.The fusing point of above-mentioned molten salt mixture, zero pour, thermal stable temperature, specific heat (at 150 DEG C) are as shown in table 1.
Embodiment 4
Get the LiNO of 26wt% 3, 20wt% NaNO 3, 52wt% KNO 3, with the CsNO of 2wt% 3after mixing, be heated to maintain after 150 DEG C 4 hours to remove the moisture content in fused salt composition, reheat to maintaining 8 hours after 400 DEG C it is evenly mixed.The fusing point of above-mentioned molten salt mixture, zero pour, thermal stable temperature, specific heat (at 150 DEG C) are as shown in table 1.
Embodiment 5
Get the LiNO of 26wt% 3, 16wt% NaNO 3, 48wt% KNO 3, with the CsNO of 10wt% 3after mixing, be heated to maintain after 150 DEG C 4 hours to remove the moisture content in fused salt composition, reheat to maintaining 8 hours after 400 DEG C it is evenly mixed.The fusing point of above-mentioned molten salt mixture, zero pour, thermal stable temperature, specific heat (at 150 DEG C) are as shown in table 1.
Table 1
Figure BDA00002637302700041
As shown in Table 1, fused salt composition in the embodiment of the present invention has high specific heat (>1.5J/gK), and (fusing point is approximately 110 DEG C to 130 DEG C with broad liquid scope, thermal stable temperature up to 550 DEG C to 570 DEG C), be suitable for as heat transfer medium and heat-storing medium.
Although the present invention discloses as above with multiple preferred embodiments, so it is not in order to limit the present invention, any the technical staff in the technical field of the invention, and without departing from the spirit and scope of the present invention, Ying Kezuo is change and retouching arbitrarily.Therefore the scope that, protection scope of the present invention should limit with appended claims is as the criterion.

Claims (7)

1. a fused salt composition, comprising:
(1) LiNO of 15wt% to 26wt% 3;
The NaNO of 12wt% to 21wt% 3;
The KNO of 43wt% to 53wt% 3; And
Ba (the NO of 3wt% to 29wt% 3) 2or the CsNO of 2wt% to 10wt% 3.
2. fused salt composition as claimed in claim 1, comprises the LiNO3 of 16wt%, the NaNO of 13wt% 3, 43wt% KNO 3, with the Ba (NO of 28wt% 3) 2.
3. fused salt composition as claimed in claim 1, comprises the LiNO of 26wt% 3, 20wt% NaNO 3, 51wt% KNO 3, with the Ba (NO of 3wt% 3) 2.
4. fused salt composition as claimed in claim 1, comprises the LiNO of 22wt% 3, 18wt% NaNO 3, 50wt% KNO 3, with the Ba (NO of 10wt% 3) 2.
5. fused salt composition as claimed in claim 1, comprises the LiNO of 26wt% 3, 20wt% NaNO 3, 52wt% KNO 3, with the CsNO of 2wt% 3.
6. fused salt composition as claimed in claim 1, comprises the LiNO of 26wt% 3, 16wt% NaNO 3, 48wt% KNO 3, with the CsNO of 10wt% 3.
7. fused salt composition as claimed in claim 1, it is heat transfer medium or the heat-storing medium of solar thermal energy power generation assembly.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108003845A (en) * 2017-12-08 2018-05-08 中国科学院青海盐湖研究所 A kind of ternary nitric acid fused salt and preparation method thereof

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US4652279A (en) * 1983-08-04 1987-03-24 Erickson Donald C Thermally stable noncorrosive water vapor absorbent
CN101050355A (en) * 2007-05-14 2007-10-10 中山大学 Fusion tray of thermal transmission and storage medium, and preparation method
US7588694B1 (en) * 2008-02-14 2009-09-15 Sandia Corporation Low-melting point inorganic nitrate salt heat transfer fluid
WO2012107834A1 (en) * 2011-02-11 2012-08-16 Eni S.P.A. Mixture of inorganic nitrate salts

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ES2332980T3 (en) * 2006-12-13 2013-04-02 Solar Millennium Ag Multinary saline system to store and transfer thermal energy
US20120056125A1 (en) * 2010-04-19 2012-03-08 Halotechnics, Inc Inorganic salt heat transfer fluid

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Publication number Priority date Publication date Assignee Title
US4652279A (en) * 1983-08-04 1987-03-24 Erickson Donald C Thermally stable noncorrosive water vapor absorbent
CN101050355A (en) * 2007-05-14 2007-10-10 中山大学 Fusion tray of thermal transmission and storage medium, and preparation method
US7588694B1 (en) * 2008-02-14 2009-09-15 Sandia Corporation Low-melting point inorganic nitrate salt heat transfer fluid
WO2012107834A1 (en) * 2011-02-11 2012-08-16 Eni S.P.A. Mixture of inorganic nitrate salts

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108003845A (en) * 2017-12-08 2018-05-08 中国科学院青海盐湖研究所 A kind of ternary nitric acid fused salt and preparation method thereof
CN108003845B (en) * 2017-12-08 2020-12-04 中国科学院青海盐湖研究所 Ternary molten nitrate salt and preparation method thereof

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