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FLiNaK fused salt and preparation method, reactor and preparation device thereof

A preparation device and reactor technology, applied in reactors, cooling devices, nuclear power generation, etc., can solve the problems of high corrosiveness and high impurity content of FLiNaK molten salt, and achieve the effect of low corrosiveness

Active Publication Date: 2018-08-07
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the defects of high impurity content and high corrosiveness of the existing FLiNaK molten salt, and provide a kind of FLiNaK molten salt and its preparation method, reactor and preparation device

Method used

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  • FLiNaK fused salt and preparation method, reactor and preparation device thereof
  • FLiNaK fused salt and preparation method, reactor and preparation device thereof
  • FLiNaK fused salt and preparation method, reactor and preparation device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0066] A preparation device for FLiNaK molten salt, which includes a gas supply module, a reactor and a tail gas treatment module connected in sequence, for details, please refer to the attached figure 1 schematic diagram;

[0067] Among them, the pipes of the gas supply module are all made of 316L stainless steel, and a heating and heat preservation device is installed for the pipes through which the HF gas flows.

[0068] Wherein, the reactor includes a main body 2 and a lining 1 arranged inside the main body 2, and the upper part of the main body 2 is sealed and connected with a flange 6 and a large cover 7, and the large cover 7 is provided with an air outlet pipe 3, two bubbling pipes 4 and 3 thermocouple casings 5 ​​and 2 bubbling tubes are respectively arranged on both sides of the large cover 7; the main body 2 of the reactor is made of N06625 alloy material; the lining 1 of the reactor is made of N02201 pure nickel material; the height-to-diameter ratio of the reactor...

Embodiment 2

[0071] A FLiNaK molten salt, the content of impurity elements in the FLiNaK molten salt is: oxygen content 97ppm, sulfur content 15.7ppm, chlorine content 23.0ppm, silicon content 90.0ppm, nickel content 14ppm, iron content 19.1ppm, calcium content 21.2ppm, Aluminum content 2.6ppm, barium content 33.4ppm, chromium content 8.1ppm, cobalt content 0.5ppm, cadmium content 0.1ppm, manganese content 1.0ppm, magnesium content 16.8ppm, copper content 1.2ppm, phosphorus content 9.1ppm, lead content <0.8ppm , zinc content 1.2ppm, vanadium content <0.1ppm, titanium content 0.9ppm, molybdenum content <0.1ppm, tungsten content <0.8ppm, zirconium content 0.5ppm, strontium content 1.3ppm, tin content 1.0ppm, the sum of the impurity elements is not more than 0.1%;

[0072] The mass ratio of LiF, NaF, and KF in the FLiNaK molten salt is 29.3:11.7:59.0, and the error of any component does not exceed ±0.3%; the melting point of the FLiNaK molten salt is 457.2°C.

[0073] The FLiNaK molten salt ...

Embodiment 3

[0080] A FLiNaK molten salt, the content of impurity elements in the FLiNaK molten salt is: oxygen content 95ppm, sulfur content 14.1ppm, chlorine content 20.7ppm, silicon content 94.3ppm, nickel content 7ppm, iron content 8.1ppm, calcium content 19.7ppm, Aluminum content 2.5ppm, barium content 32.3ppm, chromium content 10.4ppm, cobalt content 0.6ppm, cadmium content 0.1ppm, manganese content 1.1ppm, magnesium content 18.3ppm, copper content 1.3ppm, phosphorus content 10.4ppm, lead content <0.8ppm , zinc content 1.8ppm, vanadium content <0.1ppm, titanium content 0.8ppm, molybdenum content <0.1ppm, tungsten content <0.8ppm, zirconium content 0.3ppm, strontium content 1.4ppm, tin content 0.9ppm, the sum of the impurity elements is not more than 0.1%;

[0081] The mass ratio of LiF, NaF, and KF in the FLiNaK molten salt is 29.3:11.7:59.0, and the error of any component does not exceed ±0.3%; the melting point of the FLiNaK molten salt is 456.9°C.

[0082] The FLiNaK molten salt ...

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Abstract

The invention discloses a FLiNaK fused salt and a preparation method, a reactor and a preparation device thereof. The contents of oxygen, sulfur, chlorine, silicon, nickel, iron, calcium, aluminum, barium, chromium, cobalt, cadmium, manganese, magnesium, copper, phosphorus, lead, zinc, vanadium, titanium, molybdenum, tungsten, zirconium, strontium, and stannum in the FLiNaK fused salt is lower than 0.01%, and the total content of impurity elements is not more than 0.1%; and the mass ratio of LiF, NaF and KF is 29.3:11.7:59.0. The preparation method includes mixing and drying; (2) heating and melting; (3) performing bubbling treatment with hydrogen for more than 8 hours at the temperature of 500-600 DEG C; (4) performing the bubbling treatment on the mixture gas of hydrogen fluoride and hydrogen with the ratio of 1:(4-9) for more than 36 hours at the temperature of 500-550 DEG C; and (5) performing retreatment with hydrogen. The FLiNaK fused salt has excellent material compatibility with Hastelloy N, GH3535 and SUS316Ti alloy.

Description

technical field [0001] The invention relates to a FLiNaK molten salt and its preparation method, reactor and preparation device. Background technique [0002] LiF, NaF and KF are mixed and melted in a certain proportion (29.3-11.7-59.0wt%) to form a eutectic FLiNaK eutectic salt with a melting point of 458°C. FLiNaK molten salt has the characteristics of good thermal stability, low vapor pressure, and good fluidity. It can be used as a heat transfer medium for nuclear reactors, and can also be used in new energy fields such as solar thermal power generation. Pure FLiNaK molten salt has very low corrosion to Hastelloy N alloy, GH3535, SUS316Ti alloy, etc., and can serve for a long time under the premise of controlling the atmosphere and molten salt potential. [0003] Corrosion studies have shown that the corrosiveness of FLiNaK molten salt to Hastelloy N alloy, GH3535, SUS316Ti alloy and other materials is directly related to its purity. The FLiNaK molten salt formed by di...

Claims

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Application Information

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IPC IPC(8): G21C15/28G21C1/00
CPCG21C1/00G21C15/28Y02E30/30
Inventor 左勇汪洋汤睿赵素芳苏兴治侯娟谢雷东
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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