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Reaction device for uranium fluorination reaction in molten salt system and operation method thereof

A reaction device, fluorination reaction technology, applied in the direction of reactors, reactor fuel elements, greenhouse gas reduction, etc., can solve problems such as difficulty in ensuring long-term safe operation of reactors, blockage of reactor outlet gas pipe valves, etc., and achieve long-term safe operation Effect

Pending Publication Date: 2019-07-23
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

[0007] The technical problem to be solved by the present invention is to overcome that the fluorination reactor in the prior art cannot resist the double corrosion of high-temperature fluorine salt and fluorine gas, and the solid corrosion products and salt mist entrained by the air flow condense above the reactor and It will lead to the blockage of the outlet gas pipe and valve of the reactor, and then it is difficult to ensure the long-term safe operation of the reactor, and provide a new type of reaction device and its operation method for uranium fluorination reaction in molten salt system

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  • Reaction device for uranium fluorination reaction in molten salt system and operation method thereof

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Effect test

Embodiment 1

[0052] 1. Reaction device for uranium fluorination reaction in molten salt system

[0053] Such as figure 1 The shown reaction device for the uranium fluorination reaction in the molten salt system, the reaction device includes a fluorination reactor 1, a filter 2 and a ventilation pipe 3; the inner wall of the fluorination reactor 1 is provided with a nickel metal crucible lining 4, The thickness of the crucible lining 4 is 2mm, and the crucible lining 4 is used for contacting with the molten salt system, and the fluorination reactor 1 is also provided with an inert gas inlet 5 and a gas product outlet 6; The mixed gas is passed into the inner cavity of the fluorination reactor 1; the filter 2 is provided with a gas product inlet 7 and a purified gas outlet, and the filter 2 between the gas product inlet 7 and the purified gas outlet is filled with a filter filler 8 , the filter filling 8 is NaF particles, the particle size of the fluoride particles is 2-6mm; the filling dia...

Embodiment 2

[0070] 1. Reaction device for uranium fluorination reaction in molten salt system

[0071] Such as figure 1 In the shown reaction device for uranium fluorination in a molten salt system, the inner wall of the fluorination reactor 1 is provided with a ceramic crucible lining 4, the thickness of the crucible lining 4 is 2mm, and the filter filler 8 is magnesium fluoride. The particle size of the fluoride particles is 2-6mm; the filling diameter of the filter filling 8 is 10cm, the ratio of the filling height of the filter filling 8 to the filling diameter of the filter filling 8 is 3, and the vent pipe 3 is made of silicon carbide, The temperature jacket 11 is made of silicon carbide, and the rest are the same as in Embodiment 1.

[0072] 2. The operation method of the above-mentioned reaction device for uranium fluorination reaction in molten salt system

[0073] The operation method includes the following steps:

[0074] (1) KF-ZrF with uranium content of 8wt% 4 Fusion sal...

Embodiment 3

[0081] 1. Reaction device for uranium fluorination reaction in molten salt system

[0082] Such as figure 1 In the shown reaction device for uranium fluorination in a molten salt system, the inner wall of the fluorination reactor 1 is provided with a graphite crucible lining 4, the thickness of the crucible lining 4 is 5mm, and the filter filler 8 is barium fluoride particles and potassium fluoride particles, the particle size of the fluoride particles is 2-6mm; the filling diameter of the filter filling 8 is 10cm, the ratio of the filling height of the filter filling 8 to the filling diameter of the filter filling 8 is 10, and the ventilation pipe 3 It is made of nickel metal, and the temperature jacket 11 is made of nickel metal, and the rest is the same as that of Embodiment 1.

[0083] 2. The operation method of the above-mentioned reaction device for uranium fluorination reaction in molten salt system

[0084] The operation method includes the following steps:

[0085]...

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Abstract

The invention discloses a reaction device for a uranium fluorination reaction in a molten salt system and an operation method thereof. The reaction device comprises a fluorination reactor, and is characterized in that the inner wall surface of the fluorination reactor is provided with a crucible lining with the thickness being 2-5 mm, wherein the crucible lining is a nickel metal crucible lining,a nickel-based alloy crucible lining, a ceramic crucible lining or a graphite crucible lining; a filter is arranged on a pipeline where a gas product outlet of the fluorination reactor is located; a filter filler in the filter is fluoride particles with the grain size being 2-6 mm, the fluoride particles are one or more of sodium fluoride particles, magnesium fluoride particles, barium fluoride particles and potassium fluoride particles; the filling diameter of the filter filler is 3-10 cm; and the ratio of the filling height of the filter filler to the filling diameter of the filter filler is3-10. The reaction device is able to resist double corrosion of high-temperature fluorine salt and fluorine gas without causing blockage of an outlet gas pipe and a valve of the reactor, and long-term safe operation of the reactor can be achieved.

Description

technical field [0001] The invention relates to a reaction device for uranium fluorination reaction in a molten salt system and an operation method thereof. Background technique [0002] Water is not used as a solvent in the dry reprocessing of spent fuel, and the main separation steps are carried out at high temperatures. In addition, the dry reprocessing process of spent fuel has the advantages of resistance to radiation, low criticality risk, and less radioactive waste, and is suitable for processing spent fuel with high burnup and short cooling period. Fluorination and volatilization technology is an important dry post-processing technology, which fluorides low-valence uranium into high-valence fluoride UF through the following reaction 6 : [0003] UF 4 (d)+F 2 (g)→UF 6 (g) [0004] Using UF 6 The low boiling point and volatile uranium can realize the separation and recovery of uranium, and are often used in the fields of conversion of natural uranium, purificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/34G21C19/48
CPCC25C3/34G21C19/48Y02W30/50Y02E30/30
Inventor 孙理鑫周金豪牛永生胡聪伟窦强李晴暖
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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