System and method for preparing vanadium battery high-purity electrolyte
地域：
Beijing
摘要
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.
說(shuō)明書
This application is based upon and claims priority to PCT Application Number PCT/CN2017/071206, now WO 2017/128968, filed on Jan. 16, 2017, which stems from Chinese Application Number 201610060029.8 filed on Jan. 28, 2016, both of which are incorporated herein by reference in their entirety.
The present invention relates to the fields of energy and chemical engineering, and more particularly to a system and method for preparing a vanadium battery high-purity electrolyte.
Traditional fossil fuels have always been the main source of energy, however, long-term exploitation and heavy use results in depletion of resources and also brings about serious environmental pollution. The development and utilization of clean renewable energy sources such as wind, water, solar, and tidal energies have gradually attracted the attention of human society. However, renewable energy sources are difficult to be effectively used by the existing energy management systems due to their inherent intermittence.
權(quán)利要求
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 the vanadium pentoxide hopper to be sent to the primary cyclone preheater through the vanadium pentoxide screw feeder and the venturi preheater, and transmitting the vanadium pentoxide precipitate to the bed body through the feeder together with the fine powder recovered by the secondary cyclone preheater and the bag-type dust collector; and introducing purified nitrogen gas from the purified nitrogen gas main pipe into the venturi cooler, the cyclone cooler and the second cyclone separator, to be merged with the purified reducing gas from the gas purifier, to be preheated by the gas heater and then be transmitted to the bed body, such that the vanadium pentoxide powder material is kept at a fluidized state and reduced to obtain low-valence vanadium oxide powder having an average vanadium valence of 3.5 and reduction flue gas; introducing the low-valence vanadium oxide to enter the cyclone cooler through the discharger and the venturi cooler, to enter the dissolution reactor through the secondary cooling device, the low-valence vanadium oxide hopper and the low-valence vanadium oxide screw feeder together with the fine powder recovered by the second cyclone separator, to undergo dissolution reaction with clean water from the clean water main pipe and concentrated sulfuric acid from the concentrated sulfuric acid main pipe to obtain a primary electrolyte and acid mist gas, transmitting the produced acid mist gas to the tail gas treatment system, and activating the primary electrolyte by the activation device, to obtain the vanadium battery high-purity electrolyte; wherein the first cyclone separator removes dust from the produced reduction flue gas, and then transmit produced reduction flue gas to the combustion chamber together with combustion air, and the produced reduction flue gas enters the venturi preheater, the primary cyclone preheater and the secondary cyclone preheater, and is subjected to dust removing by the bag-type dust collector and then transmitted to the tail gas treatment system. 4. The method for preparing a vanadium battery high-purity electrolyte according to claim 3 , wherein the raw material of vanadium oxytrichloride has a purity of 99%-99.9999%. 5. The method for preparing a vanadium battery high-purity electrolyte according to claim 3 , wherein in the liquid phase hydrolysis reaction tank, the mass ratio of clean water to vanadium oxytrichloride added is 0.5-20, and the operation temperature is 30-90° C. 6. The method for preparing a vanadium battery high-purity electrolyte according to claim 3 , wherein the reducing gas introduced into the reducing gas purifier is hydrogen gas or coal gas. 7. The method for preparing a vanadium battery high-purity electrolyte according to claim 3 , wherein in the reduction fluidized bed body, the operation temperature is 300-700° C. in the reduction, and after the reducing gas is purified by the purifier, the content of organic substances is less than 1 mg/Nm3, the total solid particle content is less than 2 mg/Nm3, the volume fraction of the reducing gas in the mixed gas of the introduced nitrogen gas and reducing gas is 10%-90%, and the average residence time of the powder is 20-120 min. 8. The method for preparing a vanadium battery high-purity electrolyte according to claim 3 , wherein in the dissolution reactor, the resistivity of the added clean water is not less than 12.0 MΩ·cm, the concentrated sulfuric acid is electronic-grade concentrated sulfuric acid, and the dissolution temperature is 30-90° C. 9. The method for preparing a vanadium battery high-purity electrolyte according to claim 3 , wherein the vanadium battery high-purity electrolyte is a mixed electrolyte with the molar concentration ratio of vanadium ions V(III) to V(IV) of 1:1, and the average valence of vanadium ions is 3.5. 10. The method for preparing a vanadium battery high-purity electrolyte according to claim 3 , wherein in the activation device, the vanadium ions are activated by means of ultraviolet, wherein the dissolution and activation time is 30-300 minutes, the dissolution and activation temperature is 20-45° C., and the power density is 10-300 W/m3.
意見(jiàn)反饋
使用該功能遇到問(wèn)題
該功能需要專業(yè)版企業(yè)版VIP權(quán)限，您可以：
您也可以聯(lián)系官方QQ: 2157717237 電話: 13264338900