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System and method thereof for preparing vanadium battery high-purity electrolyte

An electrolyte and vanadium battery technology, which is applied in the field of preparing high-purity electrolyte for vanadium batteries, can solve the problems of reducing battery efficiency, affecting charge and discharge efficiency, affecting the stability of vanadium ions, etc., and achieve good economic and social benefits, electrolyte configuration And the effect of simple assembly, low production energy consumption and operation cost

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 and method thereof for preparing vanadium battery high-purity electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] to combine figure 1 The system for preparing high-purity electrolyte for vanadium batteries used in this example includes vanadyl trichloride storage tank 1, liquid phase hydrolysis device 2, vanadium pentoxide feeding device 3, preheating system 4, and reducing fluidized bed 5 , combustion chamber 6, cooling system 7, secondary cooling system 8, low-priced vanadium oxide feeding device 9, dissolution reactor 10, activation device 11;

[0072] The liquid phase hydrolysis device 2 comprises a liquid phase hydrolysis reaction tank 2-1 and a washing filter 2-2;

[0073] The vanadium pentoxide feeding device 3 comprises a vanadium pentoxide feed bin 3-1 and a vanadium pentoxide screw feeder 3-2;

[0074] The preheating system 4 includes a Venturi preheater 4-1, a primary cyclone preheater 4-2, a secondary cyclone preheater 4-3, and a bag filter 4-4;

[0075] The reducing fluidized bed 5 includes a feeder 5-1, a bed body 5-2, a discharger 5-3, a gas heater 5-4, a gas purif...

Embodiment 2

[0088] In this embodiment, the above-mentioned system is used to prepare a high-purity electrolyte for a vanadium battery. The specific method includes the following steps:

[0089] The vanadium trichloride liquid in the vanadyl trichloride storage tank 1 enters the liquid-phase hydrolysis reaction tank 2-1 through a pipeline, and then hydrolyzes and precipitates with the clean water from the clean water main pipe to form vanadium pentoxide precipitate and hydrochloric acid The mixed slurry of the solution; the generated acid gas is sent to the tail gas treatment system through the pipeline; the slurry enters the washing filter 2-2 and is washed with clean water, and the washing liquid and the vanadium pentoxide precipitation powder are obtained after filtering; The liquid is sent to the waste water treatment system; the vanadium pentoxide precipitation is sent in the described vanadium pentoxide silo 3-1;

[0090] The vanadium pentoxide precipitation in the vanadium pentoxide...

Embodiment 3

[0092] This embodiment takes vanadyl trichloride (above purity 2N) as raw material, and the processing capacity is 3kg / h, and in the liquid phase hydrolysis reaction tank 2-1, add clean water (resistance 15.0MΩ·cm) and vanadyl trichloride The mass ratio is 0.5, and the operating temperature is 90° C. to obtain a slurry containing vanadium pentoxide. The slurry enters the washing filter 2-2 and is washed with clean water (resistance 15.0 MΩ cm). After filtering, the washing liquid and The vanadium pentoxide precipitation powder is sent to the waste water treatment system for washing liquid, and the vanadium pentoxide precipitation enters the reducing fluidized bed after being preheated by the preheating system; in the reducing fluidized bed 5, the reducing gas introduced is coal gas, The fraction of coal gas in the mixed gas of nitrogen and coal gas in the reduction fluidized bed 5 is 10%, the average residence time of the powder is 120min, and the operating temperature is 300°C...

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Abstract

The invention discloses a system and a method thereof for preparing a vanadium battery high-purity electrolyte. According to the invention, vanadyl trichloride is taken as a raw material, vanadyl trichloride is reduced to the low-valent vanadium oxide with vanadium average valence of 3.5 through liquid phase hydrolysis and fluidization, clean water and sulfuric acid are added for dissolving, further, ultraviolet ray is employed for activating the material to obtain the vanadium electrolyte, and the electrolyte is directly used in all-vanadium redox flow battery new electric pile. sensible heat and latent heat of the high temperature tail gas are recovered by high temperature tail gas combustion preheating powder vanadium material through a reduction fluidized bed, sensible heat of the reduction product is recovered through heat exchange of products and fluidization nitrogen, arrangement of an inner member in the reduction fluidized bed realizes accurate regulation and control of valence of the reduction products, vanadium ions are activated by ultraviolet ray, 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 preparing high-purity electrolyte for vanadium batteries. 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 flexi...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/186H01M10/0562H01M2300/0002H01M8/188Y02E60/50Y02E60/10H01M8/18B01J8/0055B01J8/1827B01J14/00B01J19/0013B01J19/245B01J2208/00752B01J2208/00761B01J2219/00074C01G31/02H01M2300/0011
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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