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System for producing high-purity high-activity vanadium electrolyte and method thereof

An electrolyte, a high-activity technology, applied in chemical methods for reacting liquids with liquids, acidic electrolytes, aqueous electrolytes, etc., can solve the problems of reducing battery efficiency, affecting the stability of vanadium ions, and affecting charge and discharge efficiency, etc., to achieve a good economy Benefits and social benefits, low production energy consumption and operating costs, simple electrolyte configuration and assembly

Active Publication Date: 2016-12-28
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the impurity concentration in the electrolyte is high, it will bring the following problems: (1) There is a competitive reaction between impurity ions and vanadium ions, reducing battery efficiency
(2) In the positive electrode chamber, impurity ions are deposited on the graphite felt electrode, which blocks the gaps of the graphite felt and reduces the specific surface area of ​​the graphite felt, thereby affecting the charge and discharge efficiency
(3) In the negative electrode chamber, impurity ions will affect the hydrogen evolution overpotential, and gas production will affect the pressure balance inside the battery
(4) Impurity ions reduce the life of the proton exchange membrane
(5) Impurity ions affect the stability of vanadium ions, resulting in premature aging of the electrolyte
The main problem that this patent exists is: no specific reduction process is given, reducing V in hydrogen 2 o 5 Preparation V 2 o 4 The powder is easy to be over-reduced or under-reduced, and it needs precise control to realize it. The measures for accurately controlling the reduction are not listed in the patent; the purity is low; Chinese patents CN101880059A and CN102557134A disclose a process for producing high-purity vanadium trioxide Fluidized reduction furnace and reduction method, by adding heat transfer internal components in the fluidized bed, to achieve enhanced heat transfer; using cyclone preheating to improve energy utilization, to achieve V 2 o 3 Efficient preparation of
The method described in these two patents is only applicable to V 2 o 3 It is not suitable for the preparation of low-valent vanadium oxides in other valence states, because the system does not have the function of precisely controlling the reduction

Method used

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  • System for producing high-purity high-activity vanadium electrolyte and method thereof

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Experimental program
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Embodiment 1

[0059] combine figure 1 , the system used in the present embodiment to produce 3.5 valence high-purity vanadium electrolyte, including vanadyl trichloride storage tank 1, gas-phase ammonium fluidized bed 2, reducing fluidized bed 3, pre-cooling device 4, secondary cooling device 5. Low-priced vanadium oxide feeding device 6, dissolution reactor 7, activation device 8;

[0060] The gas phase ammonium fluidized bed 2 includes a vanadyl trichloride vaporizer 2-1, a purified ammonia water vaporizer 2-2, a chloride spray gun 2-3, a gas phase ammonium fluidized bed main body 2-4, and a first cyclone separator 2 -5, ammonium chloride settling tower 2-6;

[0061] The reducing fluidized bed 3 includes a material valve 3-1, a bed body 3-2, a discharger 3-3, a gas heater 3-4, a gas purifier 3-5, and a second cyclone separator 3-6;

[0062] The pre-cooling device 4 includes a cyclone cooler 4-1 and a third cyclone separator 4-2;

[0063] The low-valent vanadium oxide feeding device 6 i...

Embodiment 2

[0071] In this embodiment, the above-mentioned system is used to produce high-purity and high-activity vanadium electrolyte, and the specific method includes the following steps:

[0072] The vanadyl trichloride in the vanadyl trichloride storage tank 1 and the nitrogen from the nitrogen purification main pipe are vaporized and preheated by the vanadyl trichloride vaporizer 2-1 and enter the gas phase through the chloride spray gun 2-3 Ammonium fluidized bed main body 2-4; purified ammonia water and purified nitrogen are vaporized and preheated by the purified ammonia water vaporizer 2-2, and then merged with the high-temperature tail gas from the second cyclone separator 3-6 of the reducing fluidized bed , sent together into the main body 2-4 of the gas-phase ammonium fluidized bed to make vanadyl trichloride ammonium and maintain the fluidization of the powder material to form ammonium salt powder and smoke rich in ammonium chloride. gas; the ammonium salt powder is discharg...

Embodiment 3

[0075] In this embodiment, vanadyl chloride (more than 2N in purity) is used as raw material, and the processing capacity is 3kg / h. In the vanadyl chloride vaporizer 2-1, the vaporization operating temperature is 40° C., and the molar ratio of nitrogen to vanadyl chloride is 10:1; in the purified ammonia water vaporizer 2-2, the vaporization operating temperature is 40°C, and the mass ratio of nitrogen to ammonia water is 10:1; in the gas phase ammonium fluidized bed main body 2-4, ammonia water is passed through the gas phase ammonization process The mass ratio to vanadyl chloride is 10:1, the gas-phase ammonization operating temperature is 350°C, and the average residence time of the powder is 180min to obtain vanadium-containing ammonium salt; in the reducing fluidized bed 3, the reducing gas introduced is Hydrogen, feed into the mixed gas of nitrogen and hydrogen in the reducing fluidized bed 3 and the integral fraction of hydrogen is 10%, the average residence time of the ...

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Abstract

The invention discloses a system for producing a high-purity high-activity vanadium electrolyte and a method thereof. According to the invention, fluidized bed gas phase ammoniation is employed for conversing high-purity vanadium oxytrichloride to ammonium salt, ammonium salt in the other fluidized bed is reduced to the low-valent vanadium oxide with vanadium average valence of 3.5, by adding clean water and sulfuric acid for dissolving, the 3.5-valent high pure vanadium electrolyte is obtained by employing supersonic wave activation, and the electrolyte is directly used in all-vanadium redox flow battery new electric pile. The method for preparing vanadium-containing ammonium salt through fluidized bed gas phase ammoniation has the advantages of short flow and high efficiency, arrangement of an inner member in the reduction fluidized bed realizes accurate regulation and control of valence of the reduction products, the vanadium ions are activated through ultrasonic treatment, and the electrolyte activity is greatly increased. The system has the advantages of short flow, high efficiency cleaning, and stable product quality, is suitable for large-scale industrial production, and has good economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the fields of energy and chemical industry, and in particular relates to a system and method for producing high-purity and high-activity vanadium electrolyte. Background technique [0002] Traditional fossil fuels have always been the main source of energy. Due to long-term mining and extensive use, they are facing the problem of resource depletion, and also bring serious environmental pollution. The development and utilization of clean and renewable energy such as wind energy, water energy, solar energy, and tidal energy has gradually attracted the attention of human society. However, renewable energy is inherently intermittent, and existing energy management systems are difficult to use effectively. [0003] Energy storage technology is one of the ways to solve such problems. Among various energy storage systems, vanadium redox flow battery (VRB) is an attractive energy storage device. The biggest advantage of VRB is its f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50B01J8/0055B01J8/26B01J8/1827B01J2219/00002B01J14/00B01J2208/00752B01J2208/00761H01M2300/0011C01G31/02H01M8/18B01J19/0013B01J19/245B01J2219/00074
Inventor 杨海涛朱庆山范川林牟文恒刘吉斌王存虎班琦勋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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