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Heat-accumulating mixtures of halides, lithium and sodium sulfates
https://doi.org/10.15518/isjaee.2021.04-06.021-031
Abstract
The research relates to thermal and nuclear power engineering, in particular, to the development of heat-accumulating compositions that can be used to maintain a given temperature range in technological processes. The four-component mutual system Li+, Na+ || F-, Cl-, SO42- has been studied by differential thermal (DTA), differential scanning calorimetric (DSC) thermogravimetric (TG), and X-ray phase (XFA) methods of physico-chemical analysis. The choice of this system for experimental research is due to the fact that it includes fluorides and chlorides of lithium and sodium with high values of the enthalpy of the phase transition, which is one of the determining factors in the selection of heat accumulators and heat carriers for devices that accumulate thermal and solar energy, as well as lithium and sodium sulfates with a number of polymorphic transitions that allow to accumulate thermal energy in the solid phase, which expands the range of storage temperatures.
As a result of the conducted studies, the trees of phases and crystallizations of the four-component mutual system Li+, Na+ || F-, Cl-, SO42- were formed. It is established that the phase tree has a branched structure and consists of three secant quasi-triple and four four-component systems. The formation of the branched structure of the phase tree is caused by the presence in one of the three-component mutual systems (Li+, Na+ || F-, SO42-) of two adiagonal sections: Li2SO4 – Na3FSO4; LiF-Na3FSO4. The component composition and enthalpy of phase transitions in the studied systems are revealed: in one quasi – binary (LiF – Na3FSO4), with a melting point of 590 oC, the melting enthalpy of 640 J/g, in two quasi – binary: NaCl – Li2SO4 – LiF; LiF – NaCl – Na3FSO4, with melting points of 447 oC, ∆mH = 460 J/g and 554 oC, respectively; three four – component eutectic with polymorphic transformations of NaF – LiF – NaCl – Na3FSO4; LiF – Li2SO4 – NaCl – Na3FSO4; LiF – Li2SO4 – NaCl – LiCl. The developed energy-intensive compositions are able to store and release medium-and high-potential thermal energy in the liquid and solid phases due to the heat capacity, the enthalpy of melting and polymorphic transitions in the temperature range of 173-602 °C.
About the Authors
N. N. Verdiev
Institut problems of Geothermy and renewable energy branch of the joint Institute of high temperatures of the Russian Academy of Sciences; Dagestan state University
Russian Federation
Russian Federation
Verdiev Nadinbeg Nadinbegovich, Candidate of Chemical Sciences, Head of the laboratory "Accumulation of solar energy and low-potential heat"
39A, I. Shamil Ave., Makhachkala, 367015
Fax: +7 8722 62-93-76
43A, M. Gadzhieva str., Makhachkala, 367000
Fax: +7 8722 68-23-26
Z. N. Verdieva
Institut problems of Geothermy and renewable energy branch of the joint Institute of high temperatures of the Russian Academy of Sciences
Russian Federation
Russian Federation
Verdieva Zaira Nadinbegovna, Ph. D., Ph. D.
39A, I. Shamil Ave., Makhachkala, 367015
Fax: +7 8722 62-93-76
A. B. Alkhasov
Institut problems of Geothermy and renewable energy branch of the joint Institute of high temperatures of the Russian Academy of Sciences
Russian Federation
Russian Federation
Alkhasov Alibek Basirovich, Doctor of Technical Sciences, Professor, Director
39A, I. Shamil Ave., Makhachkala, 367015
Fax: +7 8722 62-93-76
P. A. Musaeva
Institut problems of Geothermy and renewable energy branch of the joint Institute of high temperatures of the Russian Academy of Sciences
Russian Federation
Russian Federation
Musaeva Patimat Abdulaevna, Ph. D. in Chemistry
39A, I. Shamil Ave., Makhachkala, 367015
Fax: +7 8722 62-93-76
I. M. Kondratyuk
Samara state technical University
Russian Federation
Russian Federation
Kondratyuk Igor Miroslavovich, Doctor of Chemical Sciences, Professor of the Department of General and Inorganic Chemistry
224, Molodogvardeyskaya street, Samara, 443100
Fax: +7 846 2784400
A. M. Amirov
Analytical center for collective use of the Dagestan scientific center of the Russian Academy of Sciences
Russian Federation
Russian Federation
Amirov Akhmed Magomedrasulovich, Candidate of Chemical Sciences, Research Assistant
39A, I. Shamil Ave., Makhachkala, 367015
Fax: +7 8722 98-99-32
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Review
For citations:
Verdiev N.N., Verdieva Z.N., Alkhasov A.B., Musaeva P.A., Kondratyuk I.M., Amirov A.M. Heat-accumulating mixtures of halides, lithium and sodium sulfates. Alternative Energy and Ecology (ISJAEE). 2021;(4-6):21-31. (In Russ.) https://doi.org/10.15518/isjaee.2021.04-06.021-031
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