CN112941539A - Vanadium electrolyte production method and production system - Google Patents
Vanadium electrolyte production method and production system Download PDFInfo
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- CN112941539A CN112941539A CN202110115750.3A CN202110115750A CN112941539A CN 112941539 A CN112941539 A CN 112941539A CN 202110115750 A CN202110115750 A CN 202110115750A CN 112941539 A CN112941539 A CN 112941539A
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 167
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 116
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 75
- 239000007788 liquid Substances 0.000 claims abstract description 49
- 238000003860 storage Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 6
- 230000005012 migration Effects 0.000 abstract description 4
- 238000013508 migration Methods 0.000 abstract description 4
- 238000007086 side reaction Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 21
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011551 heat transfer agent Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 150000003682 vanadium compounds Chemical class 0.000 description 1
- 229910001456 vanadium ion Inorganic materials 0.000 description 1
- UUUGYDOQQLOJQA-UHFFFAOYSA-L vanadyl sulfate Chemical compound [V+2]=O.[O-]S([O-])(=O)=O UUUGYDOQQLOJQA-UHFFFAOYSA-L 0.000 description 1
- 229940041260 vanadyl sulfate Drugs 0.000 description 1
- 229910000352 vanadyl sulfate Inorganic materials 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/02—Process control or regulation
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention relates to the technical field of vanadium electrolyte, and discloses a production method and a production system of vanadium electrolyte, which comprises the following steps: s1, carrying out excessive electrolysis on a first vanadium electrolyte to be reduced to obtain a second electrolyte of divalent vanadium; and S2, mixing the second electrolyte with the first electrolyte again, and obtaining a third electrolyte with a specified vanadium valence state by controlling the flow proportion according to the vanadium valence state of the first electrolyte. The method does not need the valence state proportion detection after the electrolysis is finished, and has simple production process; vanadium electrolyte with different vanadium valence states can be produced simultaneously by flow control, and the problem that the theoretical electrolysis time is not enough to ensure that the finished product liquid valence state is qualified due to side reaction and vanadium migration in the electrolysis process is solved. In one embodiment of the invention, the first electrolyte to be reduced is introduced into the cathode of the electrolytic cell stack for electrolytic reduction, so that the energy consumption of the pump can be reduced, the heat generated in the electrolytic process can be timely led out, and the automation, the continuity and the scale of the production of the vanadium electrolyte are facilitated.
Description
Technical Field
The invention relates to the technical field of vanadium electrolyte, in particular to a production method and a production system of vanadium electrolyte.
Background
The vanadium electrolyte is an important component of the all-vanadium redox flow battery, is used as an active substance of the electrochemical reaction of the battery, plays a role of an electric energy carrier, and the performance of the vanadium electrolyte directly influences the operation of an energy storage system.
The vanadium battery usually takes vanadium electrolyte with the average valence of vanadium being 3.5 as initial electrolyte, and adds the positive electrode and the negative electrode of the vanadium battery in equal volume to achieve the purpose of balancing the charge and discharge capacities of the positive electrode and the negative electrode. The existing scale vanadium battery electrolyte production technology mainly adopts a chemical reduction-electrolysis method, mainly takes vanadium pentoxide or vanadyl sulfate crystals as raw materials, adopts a reducing agent or a low-valence vanadium compound to gradually reduce the average valence of vanadium and dissolve the vanadium in an acid solution, determines electrolysis time by detecting the vanadium ion concentration of the electrolyte and the average valence of vanadium, and then carries out electrolytic reduction on the cathode of an electrolysis device to finally obtain the initial electrolyte with the average valence of vanadium of 3.5.
The prior electrolyte production technology mainly has the following defects: 1, the electrolysis process needs the electrolyte to circularly flow between the electrolysis device and the liquid storage tank, and the energy consumption of the pump is large; 2 the temperature of the electrolyte can gradually rise in the electrolysis process, which may threaten the electrolysis device, and heat exchange equipment needs to be added in the large-scale production to discharge heat in time, thereby increasing the equipment investment cost. 3, side reaction and vanadium migration phenomena exist in the electrolysis process, the theoretical electrolysis time is not long enough to ensure that the valence state of the finished product liquid is qualified, so that the electrolysis needs to be completed by detecting the average valence state of vanadium for multiple times to supplement the electrolysis time, and the production process is complicated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a vanadium electrolyte production system.
The purpose of the invention is realized by the following technical scheme:
the production method of the vanadium electrolyte comprises the following steps: s1, carrying out excessive electrolysis on a first vanadium electrolyte to be reduced to obtain a second electrolyte of divalent vanadium; and S2, mixing the second electrolyte with the first electrolyte again, and obtaining a third electrolyte with a specified vanadium valence state by controlling the flow proportion according to the vanadium valence state of the first electrolyte.
Further, the controlling the flow rate ratio includes: controlling at least one of the flow rate of the first electrolyte and the flow rate of the second electrolyte according to the formula (1) to obtain a third electrolyte with a designated valence state;
formula (1):
wherein Q is0Is the flow rate, Q, of the first electrolytevIs the flow rate of the second electrolyte, M1Is the average valence of vanadium, M, of the first electrolyte2Is the average valence of vanadium, M, of the second electrolyte3Is the average valence of vanadium in the third electrolyte.
Further, the excess electrolysis comprises: and introducing the first vanadium electrolyte into the cathode of the electrolytic cell stack, and adjusting the cathode of the electrolytic cell stack to an excessive electrolytic state by setting electrolytic current so that a liquid outlet of the cathode of the electrolytic cell stack is a second electrolyte of divalent vanadium.
Further, the second electrolyte is directly output from a cathode liquid outlet of the electrolytic cell stack to be mixed with the first electrolyte, the flow rate of the second electrolyte is the flow rate of the cathode liquid of the electrolytic cell stack, and the flow rate of the second electrolyte is calculated according to a formula (2):
formula (2):
wherein Q isvIs the flow rate of the second electrolyte, I is the electrolysis current, n is the number of single cells of the electrolysis cell stack, eta is the electrolysis efficiency of the electrolysis cell stack, k is the over-electrolysis coefficient, CvIs the total vanadium concentration, N, of the first electrolyteAIs the Avogastron constant, and e is the charge of a single electron.
The invention also aims to provide a vanadium electrolyte production system which comprises a cathode liquid storage tank, an electrolysis galvanic pile, an anode liquid storage tank, a cathode pump, an anode pump, a product liquid storage tank, a flow sensor and a third valve, wherein the cathode liquid storage tank is communicated with the electrolysis galvanic pile through the first valve, the product liquid storage tank is communicated with the cathode liquid storage tank through the second valve and the third valve respectively, and the connecting pipeline between the product liquid storage tank and the cathode liquid storage tank is also provided with the flow sensor for controlling the third valve.
Furthermore, a mixing pump is arranged outside the cathode liquid storage tank and used for conveying the electrolyte of the cathode liquid storage tank to the product liquid storage tank.
Compared with the prior art, the invention has the following beneficial effects:
the method for producing the vanadium electrolyte comprises the steps of carrying out excess electrolysis on a first vanadium electrolyte to be reduced to obtain a stable second electrolyte of divalent vanadium, then mixing the second electrolyte of divalent vanadium with the first vanadium electrolyte of known vanadium valence, and obtaining a third electrolyte of specified vanadium valence by controlling flow proportion. The method does not need the valence state proportion detection after the electrolysis is finished, and the production process is simple; vanadium electrolyte with different vanadium valence states can be produced simultaneously by flow control, and the problem that the theoretical electrolysis time is not enough to ensure that the finished product liquid valence state is qualified due to side reaction and vanadium migration in the electrolysis process is solved.
In one embodiment of the invention, the first electrolyte to be reduced is introduced into the cathode of the electrolytic cell stack for electrolytic reduction, the anolyte is circulated in the anode liquid storage tank and the electrolytic cell stack by adopting a reducing agent, and the cathode of the electrolytic cell stack is enabled to reach an excessive electrolysis state by adjusting the electrolysis current. Compared with the prior reduction method for directly electrolyzing in an electrolytic pile to obtain the product electrolyte, the method has the following advantages: 1. the pump flow is small, the running energy consumption of the pump can be greatly reduced, and the production cost of the electrolyte is reduced; 2. the second electrolyte of the divalent vanadium is directly conveyed to the outside without flowing back to the liquid storage tank, and the heat generated in the electrolysis process is timely led out by taking the vanadium electrolyte as a heat transfer agent, so that the investment of heat exchange equipment is saved; 3. is beneficial to the automation, the continuity and the scale of the production of the vanadium electrolyte.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for producing a vanadium electrolyte according to an embodiment.
Fig. 2 is a schematic structural diagram of a vanadium electrolyte production system according to an embodiment.
Detailed Description
The present invention will be further described with reference to the following detailed description, wherein the drawings are provided for illustrative purposes only and are not intended to be limiting; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Referring to fig. 1, the present invention provides a method for producing a vanadium electrolyte, comprising the following steps: s1, carrying out excessive electrolysis on a first vanadium electrolyte to be reduced to obtain a second electrolyte of divalent vanadium; and S2, mixing the second electrolyte with the first electrolyte again, and obtaining a third electrolyte with a specified vanadium valence state by controlling the flow proportion according to the vanadium valence state of the first electrolyte.
Wherein, in step S1 and S2, the vanadium valence state refers to the average vanadium valence state; the excess electrolysis in step S1 is preferably slight excess electrolysis to save energy consumption; in the step S2, the second electrolyte may be mixed with the remaining first electrolyte in the step S1, and the mixing process may be synchronous mixing of the first electrolyte and the second electrolyte, so as to improve the production efficiency in mass production;
the method comprises the steps of carrying out excess electrolysis on a first vanadium electrolyte to be reduced to obtain a stable second electrolyte of divalent vanadium, then mixing the second electrolyte of divalent vanadium with the first vanadium electrolyte of known vanadium valence, and obtaining a third electrolyte of specified vanadium valence by controlling the flow proportion. The method does not need the valence state proportion detection after the electrolysis is finished, and the production process is simple; vanadium electrolyte with different vanadium valence states can be produced simultaneously by flow control, and the problem that the theoretical electrolysis time is not enough to ensure that the finished product liquid valence state is qualified due to side reaction and vanadium migration in the electrolysis process is solved.
Specifically, the controlling the flow rate ratio includes: controlling at least one of the flow rate of the first electrolyte and the flow rate of the second electrolyte according to the formula (1) to obtain a third electrolyte with a designated valence state;
formula (1):
wherein Q is0Is the flow rate, Q, of the first electrolytevIs the flow rate of the second electrolyte, M1Is the average valence of vanadium, M, of the first electrolyte2Is the average valence of vanadium, M, of the second electrolyte3Is the average valence of vanadium in the third electrolyte.
One embodiment of the invention is to perform excess electrolysis by an electrolysis cell stack, specifically, the excess electrolysis comprises: and introducing the first vanadium electrolyte into the cathode of the electrolytic cell stack, and adjusting the cathode of the electrolytic cell stack to an excessive electrolytic state by setting electrolytic current so that a liquid outlet of the cathode of the electrolytic cell stack is a second electrolyte of divalent vanadium. Wherein the excess electrolysis state is slightly optimal to save energy consumption.
The invention is based on the conventional electrolytic method of vanadium electrolyte, the first electrolyte to be reduced is introduced into the cathode of the electrolytic cell stack for electrolytic reduction, the anolyte adopts a reducing agent such as sulfuric acid aqueous solution to circulate in the anode liquid storage tank and the electrolytic cell stack, the cathode of the electrolytic cell stack reaches an excessive electrolytic state by adjusting electrolytic current, and the liquid outlet of the cathode of the electrolytic cell stack is the second electrolyte of divalent vanadium. The second electrolyte does not flow back to the liquid storage tank, but is directly output to the production system to be mixed with the rest first electrolyte to obtain a third electrolyte with a specified vanadium valence state, such as an initial electrolyte of 3.5-valence vanadium for the all-vanadium flow battery.
Compared with the prior reduction method for directly electrolyzing the electrolytic galvanic pile to obtain the product electrolyte, the method has the following advantages that: 1. the pump flow is small, the running energy consumption of the pump can be greatly reduced, and the production cost of the electrolyte is reduced; 2. the second electrolyte of the divalent vanadium is directly conveyed to the outside without flowing back to the liquid storage tank, and the heat generated in the electrolysis process is timely led out by taking the vanadium electrolyte as a heat transfer agent, so that the investment of heat exchange equipment is saved; 3. is beneficial to the automation, the continuity and the scale of the production of the vanadium electrolyte.
As a preferable scheme of this embodiment, the second electrolyte is directly output from a cathode liquid outlet of the electrolytic cell stack to be mixed with the first electrolyte, the flow rate of the second electrolyte is a flow rate of the cathode liquid of the electrolytic cell stack, and the flow rate of the second electrolyte is calculated according to formula (2):
formula (2):
wherein Q isvIs the flow rate of the second electrolyte, I is the electrolysis current, n is the number of single cells of the electrolysis cell stack, eta is the electrolysis efficiency of the electrolysis cell stack, k is the over-electrolysis coefficient, CvIs the total vanadium concentration, N, of the first electrolyteAIs the Avogastron constant, and e is the charge of a single electron.
The over-electrolysis coefficient k is defined as: the ratio of the actual charging capacity to the theoretical charging capacity for achieving the expected average valence state of the element is k ≥ 1, and the preferred range is [1.05, 1.20 ].
In the scheme, the second electrolyte is directly output from the cathode liquid outlet of the electrolytic cell stack to be mixed with the first electrolyte, so that continuous production can be realized, and the production efficiency is improved.
As shown in figure 2, the invention also provides a vanadium electrolyte production system, which comprises a cathode liquid storage tank 2, an electrolysis electric pile 4, an anode liquid storage tank 6, a cathode pump 3 and an anode pump 5, wherein a first valve V is arranged between the cathode liquid storage tank 2 and the electrolysis electric pile 41The vanadium electrolyte production system also comprises a product liquid storage tank 7, and the product liquid storage tanks 7 are respectively communicated with each other through second valves V2Is communicated with the electrolytic cell stack 4 through a third valve V3A flow sensor is arranged on a connecting pipeline between the product liquid storage tank 7 and the cathode liquid storage tank 2 and used for controlling a third valve V3。
Specifically, a mixing pump 1 is arranged outside the cathode storage tank 2 for delivering the electrolyte of the cathode storage tank 2 to the product storage tank 7.
In the above scheme, the second valve V is controlled2And a third valve V3The second electrolyte obtained by the excess electrolysis is mixed with the first electrolyte in the product storage tank 7, and the flow sensor is used for controlling the flow of the first electrolyte in the mixing.
Examples
The purpose of this embodiment is to continuously produce vanadium electrolyte with valence of 3.5 by using the above vanadium electrolyte production method and production system, and the specific parameters are as follows:
TABLE 1 production parameters
In the production parameters, the electrolysis current I is the product of the rated current density and the effective area of the electrolysis pile, and the cathode of the electrolysis pile is adjusted to be in an excessive electrolysis state by setting the electrolysis current I to be 240A; the catholyte flow rate is also the flow rate of the second electrolyte, and is determined by the equation based on the relationship between catholyte flow rate and electrolysis current(2) Calculating to obtain a value of 1.69L/min; flow rate Q of the first electrolyte0The value obtained by calculation according to the formula (1) is 5.08L/min.
Formula (1):
wherein Q isvThe flow rate of the second electrolyte (cathode flow rate), I the electrolysis current, n the number of single cells of the electrolysis cell stack, eta the electrolysis efficiency of the electrolysis cell stack, k the over-electrolysis coefficient, M1Is the average valence of vanadium, M, of the first electrolyte2Is the average valence state of vanadium of the second electrolyte (the average valence state of vanadium of the electrolyte at the cathode liquid outlet of the electrolytic cell stack), CvIs the total vanadium concentration, N, of the first electrolyteAIs an Avogastron constant (N)A＝6.02×10^23Mol) and e is the electric charge of a single electron (e is 1.6 multiplied by 10)-19C)。
Formula (2):
wherein Q is0Is the flow rate of the first electrolyte, M3The average valence state of vanadium of the third electrolyte (the average valence state of vanadium of the product electrolyte).
The specific implementation steps of the embodiment are as follows:
1) opening the first valve V1Closing the second valve V2And starting the cathode pump 3 and the anode pump 5, and adjusting the flow rate of the catholyte to 1.69L/min.
2) Starting an electrolysis power supply of the electrolysis electric pile 4, setting the electrolysis current to 240A, and closing the valve V after 8min1And at the moment, the liquid outlet of the cathode of the electrolytic cell stack is second electrolyte of 2-valent vanadium.
3) Opening the second valve V2The mixing pump 1 is started and the valve V is controlled by the flow sensor FC1013And enabling the flow rate of the first electrolyte to be 5.08L/min, and mixing to obtain a third electrolyte, namely the target product electrolyte with the average valence of vanadium of 3.5.
In the embodiment, the 3.5-valent vanadium electrolyte is used as the electrolyte of the product, and the yield is about 400L/h. And an ultraviolet spectrophotometer is adopted to verify the average valence state of the vanadium in the electrolyte of the product, and the verification result is 3.507, which meets the product requirements.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
Claims (6)
1. The production method of the vanadium electrolyte is characterized by comprising the following steps: s1, carrying out excessive electrolysis on a first vanadium electrolyte to be reduced to obtain a second electrolyte of divalent vanadium; and S2, mixing the second electrolyte with the first electrolyte again, and obtaining a third electrolyte with a specified vanadium valence state by controlling the flow proportion according to the vanadium valence state of the first electrolyte.
2. The vanadium electrolyte production method according to claim 1, wherein the controlling the flow ratio includes: controlling at least one of the flow rate of the first electrolyte and the flow rate of the second electrolyte according to the formula (1) to obtain a third electrolyte with a designated valence state;
formula (1):
wherein Q is0Is the flow rate, Q, of the first electrolytevIs the flow rate of the second electrolyte, M1Is the average valence of vanadium, M, of the first electrolyte2Is the average valence of vanadium, M, of the second electrolyte3Is the average valence of vanadium in the third electrolyte.
3. The vanadium electrolyte production method according to claim 1 or 2, wherein the excess electrolysis includes: and introducing the first vanadium electrolyte into the cathode of the electrolytic cell stack, and adjusting the cathode of the electrolytic cell stack to an excessive electrolytic state by setting electrolytic current so that a liquid outlet of the cathode of the electrolytic cell stack is a second electrolyte of divalent vanadium.
4. The vanadium electrolyte production method according to claim 3, wherein the second electrolyte is directly output from a cathode liquid outlet of the electrolytic cell stack to be mixed with the first electrolyte, the flow rate of the second electrolyte is the flow rate of the cathode liquid of the electrolytic cell stack, and the flow rate of the second electrolyte is calculated according to the formula (2):
formula (2):
wherein Q isvIs the flow rate of the second electrolyte, I is the electrolysis current, n is the number of single cells of the electrolysis cell stack, eta is the electrolysis efficiency of the electrolysis cell stack, k is the over-electrolysis coefficient, CvIs the total vanadium concentration, N, of the first electrolyteAIs the Avogastron constant, and e is the charge of a single electron.
5. The vanadium electrolyte production system comprises a cathode liquid storage tank (2), an electrolysis galvanic pile (4), an anode liquid storage tank (6), a cathode pump (3) and an anode pump (5), wherein a first valve (V) is arranged between the cathode liquid storage tank (2) and the electrolysis galvanic pile (4)1) The device is characterized by also comprising a product liquid storage tank (7), wherein the product liquid storage tank (7) is respectively communicated with the first valve (V)2) Is communicated with the electrolytic cell (4) through a third valve (V)3) Is communicated with the cathode liquid storage tank (2), and a flow sensor is also arranged on a connecting pipeline between the product liquid storage tank (7) and the cathode liquid storage tank (2) and is used for controlling a third valve (V)3)。
6. The vanadium electrolyte production system according to claim 5, wherein a mixing pump (1) is provided outside the cathode reservoir (2) for delivering the electrolyte of the cathode reservoir (2) to the product reservoir (7).
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| CN109301300A (en) * | 2018-09-27 | 2019-02-01 | 成都先进金属材料产业技术研究院有限公司 | The method for adjusting Vanadium valence in electrolyte of vanadium redox battery |
| CN109411797A (en) * | 2018-10-30 | 2019-03-01 | 成都先进金属材料产业技术研究院有限公司 | The method for adjusting sulfuric acid system V electrolyte Vanadium valence |
| CN111200153A (en) * | 2018-11-19 | 2020-05-26 | 大连融科储能技术发展有限公司 | All-vanadium redox flow battery electrolyte formula and process for inhibiting precipitation of easily precipitated element impurities of electrolyte |
| JP2020087712A (en) * | 2018-11-26 | 2020-06-04 | 昭和電工株式会社 | Method for manufacturing catalyst-supporting negative electrode for redox flow battery |
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