System and method for preparing vanadium battery high-purity electrolyte

Patent metadata

Field	Value
Publication number	US-10868325-B2
Application number	US-201716073828-A
Country	US
Kind code	B2
Filing date	Jan 16, 2017
Priority date	Jan 28, 2016
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

A system and method for preparing a vanadium battery high-purity electrolyte, comprising preparing a low-valence vanadium oxide with a valence of 3.5 with liquid phase hydrolysis and fluidization reduction with vanadium oxytrichloride, adding clean water and sulfuric acid for dissolution, and further performing ultraviolet activation to obtain the vanadium electrolyte, for use in an all-vanadium redox flow battery stack. The high-temperature tail gas in the reduction fluidized bed is combusted for preheating the vanadium powder material, to recover the sensible heat and latent heat of the high-temperature tail gas, and the sensible heat of the reduction product is recovered through heat transfer between the reduction product and the fluidized nitrogen gas. An internal member is arranged in the reduction fluidized bed to realize the precise regulation of the valence state of the reduction product, and ultraviolet is used to activate the vanadium ions, improving the activity of the electrolyte.

First claim

What is claimed is:

1. A system for preparing a vanadium battery high-purity electrolyte, comprising a vanadium oxytrichloride storage tank, a liquid phase hydrolysis device, a vanadium pentoxide feeding device, a preheating system, a reduction fluidized bed, a combustion chamber, a cooling system, a secondary cooling system, a low-valence vanadium oxide feeding device, a dissolution reactor and an activation device;
wherein the liquid phase hydrolysis device comprises a liquid phase hydrolysis reaction tank and a washing filter;
the vanadium pentoxide feeding device comprises a vanadium pentoxide hopper and a vanadium pentoxide screw feeder;
the preheating system comprises a venturi preheater, a primary cyclone preheater, a secondary cyclone preheater and a bag-type dust collector;
the reduction fluidized bed comprises a feeder, a bed body, a discharger, a gas heater, a gas purifier and a first cyclone separator;
the cooling system comprises a venturi cooler, a cyclone cooler and a second cyclone separator;
the low-valence vanadium oxide feeding device comprises a low-valence vanadium oxide hopper and a low-valence vanadium oxide screw feeder;
wherein a feed outlet at the bottom of the vanadium oxytrichloride storage tank is connected with a chloride inlet of the liquid phase hydrolysis reaction tank through a pipeline; a clean water inlet of the liquid phase hydrolysis reaction tank is connected with a clean water main pipe through a pipeline; an acid gas outlet of the liquid phase hydrolysis reaction tank is connected with a tail gas treatment system; a slurry outlet of the liquid phase hydrolysis reaction tank is connected with a slurry inlet of the washing filter through a pipeline; a clean water inlet of the washing filter is connected with the clean water main pipe; a washing liquid outlet of the washing filter is connected with a wastewater treatment system through a pipeline; and a solid material outlet of the washing filter is connected with a feed inlet of the vanadium pentoxide hopper through a pipeline;
a feed outlet at the bottom of the vanadium pentoxide hopper is connected with a feed inlet of the vanadium pentoxide screw feeder; and a feed outlet of the vanadium pentoxide screw feeder is connected with a feed inlet of the venturi preheater through a pipeline;
a gas inlet of the venturi preheater is connected with a gas outlet of the combustion chamber through a pipeline; a gas outlet of the venturi preheater is connected with a gas inlet of the primary cyclone preheater through a pipeline; a gas outlet of the primary cyclone preheater is connected with a gas inlet of the secondary cyclone preheater through a pipeline; a feed outlet of the primary cyclone preheater is connected with a feed inlet of the feeder through a pipeline; a gas outlet of the secondary cyclone preheater is connected with a gas inlet of the bag-type dust collector through a pipeline; a feed outlet of the secondary cyclone preheater is connected with the feed inlet of the feeder through a pipeline; a gas outlet of the bag-type dust collector is connected with the tail gas treatment system; and a feed outlet of the bag-type dust collector is connected with the feed inlet of the feeder through a pipeline;
an aeration air inlet of the feeder is connected with a purified nitrogen gas main pipe; a feed outlet of the feeder is connected with a feed inlet of the bed body through a pipeline; a gas inlet of the bed body is connected with a gas outlet of the gas heater through a pipeline; a gas inlet of the gas heater is connected with a gas outlet of the second cyclone separator and a gas outlet of the gas purifier through pipelines; a combustion air inlet of the gas heater is connected with a compressed air main pipe; a fuel inlet of the gas heater is connected with a fuel main pipe; a gas inlet of the gas purifier is connected with a reducing gas main pipe; a feed outlet of the bed body is connected with a feed inlet of the discharger through a pipeline; an aeration air inlet of the discharger is connected with the purified nitrogen gas main pipe; a feed outlet of the discharger is connected with a feed inlet of the venturi cooler through a pipeline; a gas outlet of the bed body is connected with a gas inlet of the first cyclone separator through a pipeline; a feed outlet of the first cyclone separator is connected with the feed inlet of the discharger through a pipeline; and a gas outlet of the first cyclone separator is connected with a gas inlet of the combustion chamber through a pipeline;
a combustion air inlet of the combustion chamber is connected with the compressed air main pipe; and the gas outlet of the combustion chamber is connected with the gas inlet of the venturi preheater through a pipeline;
a gas inlet of the venturi cooler is connected with the purified nitrogen gas main pipe; a gas outlet of the venturi cooler is connected with a gas inlet of the cyclone cooler through a pipeline;
a gas outlet of the cyclone cooler is connected with a gas inlet of the second cyclone separator through a pipeline; a feed outlet of the cyclone cooler is connected with a feed inlet of the secondary cooling device through a pipeline; the gas outlet of the second cyclone separator is connected with a gas inlet of the gas heater through a pipeline; and a feed outlet of the second cyclone separator is connected with a feed inlet of the secondary cooling device through a pipeline;
a feed outlet of the secondary cooling device is connected with a feed inlet of the low-valence vanadium oxide hopper through a pipeline; a process water inlet of the secondary cooling device is connected with a process water main pipe through a pipeline; and a water outlet of the secondary cooling device is connected with a water cooling system through a pipeline;
a feed outlet at the bottom of the low-valence vanadium oxide hopper is connected with a feed inlet of the low-valence vanadium oxide screw feeder; and a feed outlet of the low-valence vanadium oxide screw feeder is connected with a feed inlet of the dissolution reactor through a pipeline;
a clean water inlet of the dissolution reactor is connected with the clean water main pipe through a pipeline; a concentrated sulfuric acid inlet of the dissolution reactor is connected with a concentrated sulfuric acid main pipe through a pipeline; a gas outlet of the dissolution reactor is connected with the tail gas treatment system; and a primary electrolyte outlet of the dissolution reactor is connected with a primary electrolyte inlet of the activation device through a pipeline.

2. The system for preparing a vanadium battery high-purity electrolyte according to claim 1 , wherein the bed body of the reduction fluidized bed is in the form of a rectangular multi-bin, with a built-in vertical baffle.

3. A method for preparing a vanadium battery high-purity electrolyte using the system of claim 1 , comprising the following steps:
forming vanadium oxytrichloride liquid in the vanadium oxytrichloride storage tank and moving the vanadium oxytrichloride liquid into the liquid phase hydrolysis reaction tank through a pipeline, and then subject the vanadium oxytrichloride to hydrolysis precipitation together with clean water from the clean water main pipe forming a mixed slurry of vanadium pentoxide precipitate and hydrochloric acid solution; transmitting the produced mixed slurry of vanadium pentoxide precipitate and hydrochloric acid solution to the tail gas treatment system through a pipeline; introducing the mixed slurry to the washing filter to be subjected to washing with clean water and filtration to obtain washing liquid and vanadium pentoxide precipitate powder; transmitting the washing liquid to the wastewater treatment system; and transmitting the vanadium pentoxide precipitate to the vanadium pentoxide hopper;
forming the vanadium pentoxide precipitate in

Assignees

• Inst Process Eng Cas
• Beijing Zhongkaihongde Tech Co Ltd

Inventors

• Yang Haitao
• Zhu Qingshan
• Fan Chuanlin
• Mu Wenheng
• Liu Jibin
• Wang Cunhu
• Ban Qixun

Classifications

• Y02E60/50

  Fuel cells · CPC title

• B01J2208/00761

  Discharging · CPC title

• B01J19/245

  placed in series · CPC title

• H01M8/188 Primary

  by recharging of redox couples containing fluids; Redox flow type batteries · CPC title

• B01J19/0013

  Controlling the temperature of the process · CPC title