CN103923618A - Heat-transfer heat-accumulation medium prepared by combining quartz sand and multi-composition molten nitrate salt and preparation method - Google Patents
Heat-transfer heat-accumulation medium prepared by combining quartz sand and multi-composition molten nitrate salt and preparation method Download PDFInfo
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- CN103923618A CN103923618A CN201310040909.5A CN201310040909A CN103923618A CN 103923618 A CN103923618 A CN 103923618A CN 201310040909 A CN201310040909 A CN 201310040909A CN 103923618 A CN103923618 A CN 103923618A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000006004 Quartz sand Substances 0.000 title claims abstract description 51
- 238000012546 transfer Methods 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000009825 accumulation Methods 0.000 title claims abstract description 11
- 239000000203 mixture Substances 0.000 title claims abstract description 9
- 150000002823 nitrates Chemical class 0.000 title abstract 5
- 238000010248 power generation Methods 0.000 claims abstract description 10
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 150000003839 salts Chemical class 0.000 claims description 62
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 47
- 229910017604 nitric acid Inorganic materials 0.000 claims description 47
- 238000005338 heat storage Methods 0.000 claims description 28
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 26
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 26
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 14
- 229910013553 LiNO Inorganic materials 0.000 claims description 13
- 235000010333 potassium nitrate Nutrition 0.000 claims description 13
- 239000004323 potassium nitrate Substances 0.000 claims description 13
- 235000010344 sodium nitrate Nutrition 0.000 claims description 13
- 239000004317 sodium nitrate Substances 0.000 claims description 13
- 229940001516 sodium nitrate Drugs 0.000 claims description 13
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 12
- NLSCHDZTHVNDCP-UHFFFAOYSA-N caesium nitrate Chemical class [Cs+].[O-][N+]([O-])=O NLSCHDZTHVNDCP-UHFFFAOYSA-N 0.000 claims description 10
- 235000010288 sodium nitrite Nutrition 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 8
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical class [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000004520 agglutination Effects 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 9
- 229910002651 NO3 Inorganic materials 0.000 description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000012430 stability testing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 206010012373 Depressed level of consciousness Diseases 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention relates to a heat-transfer heat-accumulation medium prepared by combining quartz sand and a multi-composition molten nitrate salt and a preparation method, and belongs to the field of solar photo-thermal power generation. The heat-transfer heat-accumulation medium is composed of a multi-composition molten nitrate salt system and quartz sand. The invention also provides the preparation method of the heat-transfer heat-accumulation medium. The heat-transfer heat-accumulation medium disclosed by the invention keeps the low melting point of the multi-composition molten nitrate salt, and also helps to improve the upper limit operating temperature of the multi-composition molten nitrate salt, and the upper limit operating temperature is up to 700 DEG C. The heat-transfer medium is low in cost, wide in operating temperature range, good in heat stability and high in thermal conductivity, and is extremely suitable for a solar thermal power generation system and a heat-accumulation heat-transfer system based on solar photo-thermal power generation.
Description
Technical field
The present invention relates to the heat-accumulating heat-transfer complex media for solar light-heat power-generation, particularly relate to a kind of quartz sand composite multi-component nitric acid Molten Salt Heat Transfer heat storage medium and preparation method.
Background technology
In industrial accumulation of energy and solar light-heat power-generation technology, the heat-accumulating heat-transfer medium using at present mainly contains the metals such as air, water, thermal oil, melting salt, sodium and aluminium.Fused salt is because having use temperature scope widely, low-steam pressure, low viscosity, satisfactory stability, many characteristics such as low cost have become the heat transfer heat storage medium that has much potentiality in solar light-heat power-generation technology, become current application more, comparatively ripe heat transfer heat storage medium.High-temperature fusion salt mainly contains nitrate, carbonate, vitriol, fluorochemical, muriate, oxide compound etc.
The raw material sources of nitric acid molten salt system are extensive, cheap, corrodibility is little, therefore compare with other fused salts, and nitric acid fused salt has very large advantage.Polynary nitric acid fused salt fusing point is wherein low, but upper limit use temperature is low.
Chinese patent application 00111406.9 discloses a kind of LiNO
3-KNO
3-NaNO
3-NaNO
2polynary nitric acid molten salt system, its operating temperature range is 250 ° of C-550 ° of C, the upper limit working temperature of this individual system is higher than ternary nitrate system, reaches 550 ° of C, but its lower limit working temperature is also enhanced, and while causing obnubilation, maintenance cost increases, and LiNO
3add its corrodibility increased, cost up.
US Patent No. 007588694B1 discloses a kind of LiNO
3-KNO
3-NaNO
3-Ca(NO
3)
2polynary nitric acid molten salt system, its fusing point is lower than 100 ° of C, and upper limit use temperature is higher than 500 ° of C, but LiNO
3add system increased the corrodibility of hold over system, industrial cost increases.
The molecular chain structure of quartz sand uniqueness, crystal shape and lattice variations rule, make it have many characteristics such as high temperature resistant, anti-oxidant, thermal expansivity is little, high-insulation, unique physics such as corrosion-resistant, chemistry, in many high-tech products, bring into play more and more important effect, be often used as the raw material of manufacturing glass, refractory materials, smelting duriron, flux for metallurgy, ceramic grinding material, casting.
So far, do not see quartz sand is joined in polynary nitric acid fused salt as the report of the heat transfer heat storage medium in industrial accumulation of energy and solar energy high temperature thermal utilization field.
Summary of the invention
The object of the present invention is to provide a kind of quartz sand composite multi-component nitric acid Molten Salt Heat Transfer heat storage medium and preparation method, quartz sand add the upper limit working temperature that has improved system, and zero pour (fusing point that DSC differential scanning instrument is measured) does not change substantially, therefore widened the operating temperature range of polynary nitric acid molten salt system, can be widely used in industrial accumulation of energy and solar light-heat power-generation technical field, and because quartz sand is cheap, fused salt production cost is significantly reduced.
For achieving the above object, technical scheme of the present invention is as follows:
A quartz sand composite multi-component nitric acid Molten Salt Heat Transfer heat storage medium, is characterized in that: described heat transfer heat storage medium is in polynary nitric acid molten salt system, to add quartz sand to be composited.
Described polynary nitric acid molten salt system accounts for 50 ~ 99% of heat transfer heat storage medium gross weight, and quartz sand accounts for 1 ~ 50%.
Described polynary nitric acid molten salt system accounts for 50 ~ 90% of heat transfer heat storage medium gross weight, and quartz sand accounts for 10 ~ 50%.
Described polynary nitric acid molten salt system is KNO
3-NaNO
3-NaNO
2-CsNO
3system,
KNO
3-NaNO
3-NaNO
2-Ca (NO
3)
2system,
KNO
3-NaNO
3-NaNO
2-LiNO
3system,
KNO
3-NaNO
3-CsNO
3-Ca (NO
3)
2system,
KNO
3-NaNO
3-LiNO
3-CsNO
3system or KNO
3-NaNO
3-NaNO
2-CsNO
3-Ca (NO
3)
2system.
Described KNO
3-NaNO
3-NaNO
2-CsNO
3the components by weight percent of system is as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, Sodium Nitrite 20-50 part, 1 part-10 parts of cesium nitrates;
Described KNO
3-NaNO
3-NaNO
2-Ca (NO
3)
2the component of system is as follows: 40 parts-80 parts, saltpetre, and 5 parts-15 parts of SODIUMNITRATE; 20 parts-50 parts of Sodium Nitrites, 1 part-10 parts, nitrocalcite;
Described KNO
3-NaNO
3-NaNO
2-LiNO
3the component of system is as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, 20 parts-50 parts of Sodium Nitrites; 1 part-10 parts of lithium nitrates;
Described KNO
3-NaNO
3-CsNO
3-Ca (NO
3)
2the component of system is as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, 20 parts-50 parts of cesium nitrates, 1 part-10 parts, nitrocalcite;
Described KNO
3-NaNO
3-LiNO
3-CsNO
3the component of system is as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, 20 parts-50 parts of lithium nitrates, 1 part-10 parts of cesium nitrates;
Described KNO
3-NaNO
3-NaNO
2-CsNO
3-Ca (NO
3)
2component as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, 10 parts-50 parts of Sodium Nitrites, 10 parts-30 parts of cesium nitrates, 10 parts-30 parts, nitrocalcite.
The purposes of above-mentioned arbitrary heat transfer heat storage medium in industrial accumulation of energy or solar light-heat power-generation.
Above-mentioned arbitrary preparation method who states heat transfer heat storage medium, its step is as follows:
(1) form described polynary nitric acid molten salt system, put into reactor, heated and stirred makes fused salt become melting completely, is then incubated 0.5-1h,
(2) under agitation condition, quartz sand is distributed in high-temperature fusion salt, continues to stir 1-2h, mixture agglutination state,
(3) cooling, packing.
The temperature that described heated and stirred adopts the complete melting of fused salt is the above 80-120 ℃ of transformation temperature of described polynary nitric acid fused salt.
The present invention selects quartz sand as the matrix material of nitric acid fused salt first, and quartz sand is a kind of silicate minerals of hard, wear-resisting, stable chemical performance, and its main component is SiO
2, in mineral, often contain a small amount of impurity component as Fe
2o
3, Al
3o
2, CaO, MgO, NaO etc.Approximately 1723 ℃ of fusing points, approximately 2230 ℃ of boiling points, have higher fire performance.The common quartz sand that adopts dioxide-containing silica to be greater than 75% for quartz sand of the present invention.Experiment showed, and in polynary nitric acid molten salt system, add quartz sand to prepare the heat transfer heat storage medium of gained, industrial cost is low, very micro-to hold over system corrodibility, and compares and have following advantage and positively effect with former polynary nitric acid molten salt system:
Composite fused salt heat transfer heat storage medium prepared by the present invention had both had the heat transfer property of nitric acid fused salt, had improved again thermostability and upper limit use temperature.
Add quartz sand substantially not change the fusing point of former polynary nitric acid molten salt system, but latent heat of phase change is increased to some extent, energy storage density is high, and this can reduce the requirement to hold over system size and energy.
The quartz sand that the present invention adds in polynary nitric acid molten salt system, granularity is more carefully more conducive to the heat transfer property of system.
In the preferred embodiments of the invention, quartz sand accounts for 1 ~ 50%, and quartz sand content is higher, reduces costs more obvious; The ceiling temperature that can guarantee polynary nitric acid fused salt within the scope of this improves, and can guarantee that again fusing point does not raise.
Embodiment
Below in conjunction with specific embodiment, describe the present invention.
Experiment material:
Common quartz sand (dioxide-containing silica is greater than 75%), 100 orders are purchased from Shandong Hong Tai quartz sand factory.
Saltpetre, SODIUMNITRATE, Sodium Nitrite, cesium nitrate, nitrocalcite, lithium nitrate: technical pure level, generally chemical article company can buy.
Polynary nitrate system formulation is as table 1.
Polynary nitric acid system formula in each embodiment of table 1.
Many yuan of nitrate system KNO of embodiment 1 ~ 3.
3-NaNO
3-NaNO
2-CsNO
3in add quartz sand to prepare heat-accumulating heat-transfer medium
The preparation of step 1. quartz sand composite multi-component nitric acid fused salt product 1 ~ 3:
Press the listed formula of table 1 and prepare to form the material of polynary nitric acid molten salt system, after heated and stirred is even, add quartz sand, continue heated and stirred, with degasification, dewater, Heating temperature is the above 80-120 of fused salt transformation temperature ° C.
Quartz sand (100 order) is distributed in the polynary nitric acid molten salt system of melting, stirs this molten mixture 1-2h, obtain quartz sand composite multi-component nitric acid Molten Salt Heat Transfer heat storage medium.Quartz sand accounts for respectively 1%, 20%, 50% in product 1 ~ 3.
The heat stability testing of step 2. product 1 ~ 3
To the heat transfer heat storage medium preparing and contrast polynary nitric acid fused salt and carry out heat stability testing.
Test adopts weighting method to carry out: 3 kinds of melting salts of embodiment 1 ~ 3 gained are respectively charged in the crucible of nickel system, put into temperature controlling stove and heat, from normal temperature, start to test, take out at set intervals experiment crucible and weigh with analytical balance.If in a certain temperature section, the weight of sample no longer reduces, then improves the temperature of temperature controlling stove.And then take out at set intervals experiment crucible and weigh, then continue again to heat up after another stable state.
Result shows:
Under 600 ° of C of fused salt of product 1 ~ 3, be incubated 120 hours, rate of loss is all less than 1;
Under 700 ° of C, be incubated 30 hours, the rate of loss of three products is about respectively 20%, 3%, 1%.
Contrast, for not adding three kinds of polynary nitric acid system fused salts (table 1 embodiment numbers the system of 1 ~ 3 correspondence) of quartz sand, can move 30 hourly loss rates and be about 8% under 600 ° of C, but under 700 ° of C, occurs significantly loss, moves to 30 hours, and rate of loss reaches 25%
Illustrate and add quartz sand can effectively improve nitric acid molten salt system stability and raising SC service ceiling temperature at high temperature.
The latent heat of phase change test of step 3. product 1 ~ 3 and fusing point test.
Adopt general differential scanning instrument DSC to carry out (under normal pressure, scanning).
Test result demonstration, compared with the control, latent heat of phase change all obviously increases; The fusing point of product 1,2 is substantially constant, and the fusing point of product 3 increases a little.
More than 4 ~ 6 yuan of nitrate system KNO of embodiment
3-NaNO
3-NaNO
2-Ca (NO
3)
2in add quartz sand to prepare heat-accumulating heat-transfer medium
Press the listed formula of table 1 and prepare to form the material of polynary nitric acid molten salt system.
The preparation method of product 4 ~ 6 and detection method are completely with embodiment 1 ~ 3, and quartz sand (100 order) accounts for respectively 10%, 25%, 40%; Contrast, containing quartz sand, is not the system of 4 ~ 6 correspondences of embodiment in table 1.
Thermal stability determination result is similar to embodiment 1 ~ 3, under 700 ° of C, is incubated after 30 hours, and the rate of loss of three kinds of products that the present invention prepares successively approximately 10%, 3%, 1%, is starkly lower than the highest by 28% of contrast.
Adopt general differential scanning instrument DSC to carry out (under normal pressure, scanning).Test result demonstration, compared with the control, latent heat of phase change all obviously increases; Fusing point is substantially constant.
Many yuan of nitrate system KNO of embodiment 7 ~ 9.
3-NaNO
3-NaNO
2-LiNO
3in add quartz sand to prepare heat-accumulating heat-transfer medium
Press the listed formula of table 1 and prepare to form the material of polynary nitric acid molten salt system
Preparation method and detection method are completely with embodiment 1 ~ 3.
The added quartz sand of embodiment 7 ~ 9 (100 order) accounts for 15%, 30%, 45%
Thermal stability determination result is similar to embodiment 1 ~ 3, under 700 ° of C, is incubated after 30 hours, and the rate of loss of three kinds of products that the present invention prepares is the highest by 12%, 4%, 2%, is starkly lower than 30% of contrast.
Adopt general differential scanning instrument DSC to carry out (under normal pressure, scanning).Test result demonstration, compared with the control, the fusing point of product 7 ~ 9 is substantially constant, and latent heat of phase change increases to some extent.
More than 10 ~ 12. yuan of nitrate system KNO of embodiment
3-NaNO
3-CsNO
3-Ca (NO
3)
2in add quartz sand to prepare heat-accumulating heat-transfer medium
The preparation method of product 10 ~ 12 and detection method are completely with embodiment 10 ~ 12, and quartz sand (100 order) accounts for respectively 10%, 25%, 45%; Contrast, containing quartz sand, is not the system of 10 ~ 12 correspondences of embodiment in table 1.
Thermal stability determination result and embodiment 7 ~ 9 are closely similar, under 700 ° of C, are incubated after 30 hours, and the rate of loss of three kinds of products that the present invention prepares is the highest by 12%, 3%, 2%, is starkly lower than 30% of contrast.
Adopt general differential scanning instrument DSC to carry out (under normal pressure, scanning).Test result demonstration, compared with the control, latent heat of phase change increases to some extent, and the fusing point of product 10 ~ 11 is substantially unchanged, and the fusing point of product 12 increases slightly.
In embodiment 13 ~ 18 other polynary nitrate systems, add quartz sand to prepare heat-accumulating heat-transfer medium
The preparation method of product 13 ~ 18 and detection method are completely with embodiment 13 ~ 18, and quartz sand (100 order) ratio of three kinds of formula institute proportionings of every kind of polynary nitric acid molten salt system is respectively: 15%, 25%, 40%; Contrast, containing quartz sand, is not the system of 13 ~ 18 correspondences of embodiment in table 1.
Thermal stability determination result was incubated after 30 hours at 700 ℃, and the rate of loss of 6 kinds of products that the present invention prepares is the highest by 11%, 2.5%, 1%, was starkly lower than 30% of contrast.
Adopt general differential scanning instrument DSC to carry out (under normal pressure, scanning).Test result demonstration, compared with the control, the fusing point of product 13 ~ 18 is substantially constant, and latent heat of phase change increases to some extent.Above-mentioned experimental result explanation: the present invention adds quartz sand to prepare the heat transfer heat storage medium of gained in polynary nitric acid molten salt system, very micro-to hold over system corrodibility, and compares with former polynary nitric acid molten salt system the progress that has brought following several respects:
The heat transfer property of existing nitric acid fused salt, has improved again the upper limit use temperature of polynary nitric acid fused salt; Use temperature scope is wider, Heat stability is good.
Latent heat of phase change is large, and energy storage density is high, has reduced the requirement to hold over system size and energy, and capacity usage ratio is high, good energy-conserving effect.
Molten Salt Heat Transfer heat storage medium heat conductivility prepared by the present invention increases greatly, has overcome nitric acid fused salt heat conductivility poor, and easily the shortcoming of local superheating, can be widely used in solar light-heat power-generation technical field.
Claims (8)
1. a quartz sand composite multi-component nitric acid Molten Salt Heat Transfer heat storage medium, is characterized in that: described heat transfer heat storage medium is in polynary nitric acid molten salt system, to add quartz sand to be composited.
2. heat transfer heat storage medium according to claim 1, is characterized in that: described polynary nitric acid molten salt system accounts for 50 ~ 99% of heat transfer heat storage medium gross weight, and quartz sand accounts for 1 ~ 50%.
3. heat transfer heat storage medium according to claim 2, is characterized in that: described polynary nitric acid molten salt system accounts for 50 ~ 90% of heat transfer heat storage medium gross weight, and quartz sand accounts for 10 ~ 50%.
4. heat transfer heat storage medium according to claim 1, is characterized in that:
Described polynary nitric acid molten salt system is:
KNO
3-NaNO
3-NaNO
2-CsNO
3system,
KNO
3-NaNO
3-NaNO
2-Ca (NO
3)
2system,
KNO
3-NaNO
3-NaNO
2-LiNO
3system,
KNO
3-NaNO
3-CsNO
3-Ca (NO
3)
2system,
KNO
3-NaNO
3-LiNO
3-CsNO
3system or
KNO
3-NaNO
3-NaNO
2-CsNO
3-Ca (NO
3)
2system.
5. heat transfer heat storage medium according to claim 4, is characterized in that:
Described KNO
3-NaNO
3-NaNO
2-CsNO
3the components by weight percent of system is as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, Sodium Nitrite 20-50 part, 1 part-10 parts of cesium nitrates;
Described KNO
3-NaNO
3-NaNO
2-Ca (NO
3)
2the component of system is as follows: 40 parts-80 parts, saltpetre, and 5 parts-15 parts of SODIUMNITRATE; 20 parts-50 parts of Sodium Nitrites, 1 part-10 parts, nitrocalcite;
Described KNO
3-NaNO
3-NaNO
2-LiNO
3the component of system is as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, 20 parts-50 parts of Sodium Nitrites; 1 part-10 parts of lithium nitrates;
Described KNO
3-NaNO
3-CsNO
3-Ca (NO
3)
2the component of system is as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, 20 parts-50 parts of cesium nitrates, 1 part-10 parts, nitrocalcite;
Described KNO
3-NaNO
3-LiNO
3-CsNO
3the component of system is as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, 20 parts-50 parts of lithium nitrates, 1 part-10 parts of cesium nitrates;
Described KNO
3-NaNO
3-NaNO
2-CsNO
3-Ca (NO
3)
2component as follows: 40 parts-80 parts, saltpetre, 5 parts-15 parts of SODIUMNITRATE, 10 parts-50 parts of Sodium Nitrites, 10 parts-30 parts of cesium nitrates, 10 parts-30 parts, nitrocalcite.
6. the purposes of the arbitrary described heat transfer heat storage medium of claim 1 ~ 5 in industrial accumulation of energy or solar light-heat power-generation.
7. the preparation method of the arbitrary described heat transfer heat storage medium of claim 1 ~ 5, its step is as follows:
(1) form described polynary nitric acid molten salt system, put into reactor, heated and stirred makes fused salt become melting completely, is then incubated 0.5-1h,
(2) under agitation condition, quartz sand is distributed in high-temperature fusion salt, continues to stir 1-2h, mixture agglutination state,
(3) cooling, packing.
8. preparation method according to claim 7, is characterized in that: the temperature that described heated and stirred adopts the complete melting of fused salt is the above 80-120 ℃ of transformation temperature of described polynary nitric acid fused salt.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310040909.5A CN103923618B (en) | 2013-02-01 | 2013-02-01 | Quartz sand composite multi-component nitric acid Molten Salt Heat Transfer heat storage medium and preparation method |
| US14/765,295 US10865335B2 (en) | 2013-02-01 | 2014-01-21 | Quartz sand/graphite composite molten salt heat transfer and heat storage medium and preparation method thereof |
| EP14745627.1A EP2952551B1 (en) | 2013-02-01 | 2014-01-21 | Quartz sand composite molten salt heat transfer and heat storage medium |
| PCT/CN2014/070970 WO2014117663A1 (en) | 2013-02-01 | 2014-01-21 | Quartz sand/graphite composite molten salt heat transfer and heat storage medium and preparation method thereof |
| PT147456271T PT2952551T (en) | 2013-02-01 | 2014-01-21 | Quartz sand/graphite composite molten salt heat transfer and heat storage medium and preparation method thereof |
| ES14745627T ES2848832T3 (en) | 2013-02-01 | 2014-01-21 | Molten salt heat transfer and heat storage medium composed of quartz sand |
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| CN108851193A (en) * | 2018-05-29 | 2018-11-23 | 江苏中烟工业有限责任公司 | A kind of preparation method heating cigarette core material of not burning |
| CN109777365A (en) * | 2019-01-29 | 2019-05-21 | 云南科威液态金属谷研发有限公司 | A kind of liquid metal composite phase-change energy storage material and its preparation method and application |
| TWI847307B (en) * | 2021-10-17 | 2024-07-01 | 國立成功大學 | Phase change material for heat exchangers and waste heat recovery system |
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