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Method for rapidly finding lowest melting point of quaternary molten salt system

A technology with low melting point and melting point, applied in chemical instruments and methods, heat exchange materials, investigation phase/state change, etc., can solve problems such as blind screening of molten salt formula, complex and unreliable quaternary molten salt system, etc., to achieve Reduce the experimental workload, quickly find the eutectic point, and improve the reliability of the effect

Inactive Publication Date: 2019-03-05
SHENZHEN ENESOON SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1. The quaternary molten salt system is more complex than the binary system and ternary system, and the process of finding the lowest melting point is more complicated
[0005] 2. To find the melting point of the multi-component molten salt system, it is necessary to test a large number of molten salt formulas. The process is slow, and there is no prior work to predict the formula corresponding to the corresponding lowest melting point. The screening of molten salt formula is very blind
[0006] 3. The method of obtaining the melting point by calculating the phase diagram of molten salt is not reliable, and it still needs to rely on experimental data to verify the calculation method

Method used

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  • Method for rapidly finding lowest melting point of quaternary molten salt system
  • Method for rapidly finding lowest melting point of quaternary molten salt system
  • Method for rapidly finding lowest melting point of quaternary molten salt system

Examples

Experimental program
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Effect test

Embodiment 1

[0054] This embodiment provides a method for quickly finding the lowest melting point of a quaternary molten salt system, including the following steps:

[0055] (1) Draw the component diagram of the quaternary molten salt system (component A-component B-component C-component D) (see figure 1 ), the composition diagram is denoted as a regular tetrahedron ABCD. The 4 vertices of the regular tetrahedron represent 4 kinds of pure substances (namely A substance, B substance, C substance and D substance), and the 4 triangular faces represent 4 A ternary molten salt system (namely ABD ternary molten salt system, ACD ternary molten salt system, BCD ternary molten salt system, ABC ternary molten salt system);

[0056] (2) Measuring surface ABC (the component diagram of the ternary molten salt system represented by it, see figure 2 ) The melting points at the 3 vertices, the melting points at 4 points on each side (the 4 points divide the side on which it is located equally), and the meltin...

Embodiment 2

[0064] (1) Draw the composition diagram of the quaternary molten salt system (component A-component B-component C-component D), which is marked as regular tetrahedron ABCD, 4 vertices of regular tetrahedron Respectively represent 4 kinds of pure substances (namely A substance, B substance, C substance and D substance), and the 4 triangular faces respectively represent 4 kinds of ternary molten salt systems (namely ABD ternary molten salt system, ACD ternary molten salt system) , BCD ternary molten salt system, ABC ternary molten salt system);

[0065] (2) Measure the melting points at the 3 vertices of the surface BCD, the melting points at 4 points on each side (the 4 points divide the side where it is located), and the 6 points inside the surface BCD Melting point (the 6 points are obtained by crossing the points on each side of the BCD as the parallel lines of the three sides of the BCD);

[0066] (3) Using the melting point temperature measured in step (2) as the data point, u...

Embodiment 3

[0073] Except for face A'B'C' and the 4 faces obtained in step (6), the content of D corresponding to 10%, 20%, 30%, 50% and 70% respectively, other test methods and conditions are the same as in Example 1. .

[0074] In the embodiment of the present invention, in addition to the marked points, some of the points can be obtained from the information in the molten salt of the Hitec system. The melting point temperature obtained by the search is basically consistent with the result detected by the method of the present invention, which verifies The reliability of the method of the invention.

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Abstract

The invention discloses a method for finding the lowest melting point of a quaternary molten salt system, and the method comprises: 1) drawing a component diagram of the quaternary molten salt system;2) selecting a surface I representing a ternary molten salt system, and measuring melting points of three vertexes of the surface I, at least one point of each edge of the surface I, and at least onepoint in the surface I; 3) taking the melting points as data points, and drawing an isothermal curve by utilizing software; 4) in a low-melting-point component region, testing by the same method, andr reducing the prediction range until lowest melting point a is found; 5) continuing to obtain a triangle II on a regular tetrahedron, and repeating the operation to obtain lowest melting point b ofthe triangle II; 6) repeating the step 5) for at least one time, and then obtaining at least one lowest melting point; and 7) taking the lowest melting points as data points, and drawing an isothermalcurve by utilizing the software, and pre-judging the change rule of the melting point of the quaternary molten salt system along with the component to obtain the lowest melting point of the quaternary molten salt system. The method disclosed by the invention can be used for rapidly finding the lowest melting point of the quaternary molten salt.

Description

Technical field [0001] The invention belongs to the technical field of melting point measurement of a quaternary molten salt system, and relates to a method for finding the lowest melting point of a quaternary molten salt system, in particular to a method for quickly finding the lowest melting point of a quaternary molten salt system. Background technique [0002] At present, in the fields of industrial energy storage and solar high-temperature heat utilization, the nitrate molten salt system is the main body used for heat transfer and storage medium, and the binary molten salt KNO 3 -NaNO 3 Although the system has a higher melting point, it is easy to cause blockage of the pipeline and affect the safety of the system. Therefore, it is very urgent to develop low melting point molten salt. The quaternary molten salt system has received more and more attention because of its low melting point and good high temperature stability. [0003] At present, the only reliable way to find the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/04
CPCG01N25/04C09K5/12
Inventor 曾智勇曾帆崔小敏
Owner SHENZHEN ENESOON SCI & TECH
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