CN217304998U - Detection apparatus for vanadium electrolyte production terminal - Google Patents

Detection apparatus for vanadium electrolyte production terminal Download PDF

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CN217304998U
CN217304998U CN202220678214.4U CN202220678214U CN217304998U CN 217304998 U CN217304998 U CN 217304998U CN 202220678214 U CN202220678214 U CN 202220678214U CN 217304998 U CN217304998 U CN 217304998U
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electrolyte
vanadium
production
battery
cell
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史小虎
胡金岷
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China Energy Investment Corp Ltd
National Institute of Clean and Low Carbon Energy
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China Energy Investment Corp Ltd
National Institute of Clean and Low Carbon Energy
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Abstract

The utility model relates to a vanadium electrolyte production technical field for full vanadium redox flow battery discloses a detection device of vanadium electrolyte production terminal, a serial communication port, include: a reference electrolyte storage tank, a reference battery, a voltage tester and a delivery pump which are connected by a hydraulic pipeline; the reference electrolyte storage tank is used for storing reference electrolyte; the voltage tester is used for measuring the open-circuit voltage of the reference cell. By applying the device for detecting the production endpoint of the vanadium electrolyte, the vanadium valence state and vanadium concentration test of the initial electrolyte after chemical reduction can be avoided, the process flow is optimized, and the detection time is greatly saved; the judgment of the electrolysis end point is prevented from being influenced by the change of the electrolysis efficiency. The state of the produced electrolyte can be mastered; the valence state of the electrolyte can be rapidly detected, and the consistency of the electrolyte among batches is ensured.

Description

Detection apparatus for vanadium electrolyte production terminal point
Technical Field
The utility model relates to an all vanadium redox flow battery uses vanadium electrolyte production technical field, especially relates to a detection device of vanadium electrolyte production terminal point.
Background
The detection of the production end point of the traditional vanadium electrolyte needs to sample and test the electrolyte, and is time-consuming and labor-consuming. Therefore, compared with the traditional electrolytic cell, the circulating electrolysis reaction device for the vanadium cell electrolyte can reduce the cell voltage and the electrolysis energy consumption, improve the electrolysis efficiency and shorten the production period, but only considers the electrolyte production section and does not relate to the rapid detection of the electrolyte; the prior art also provides a miniature vanadium battery and a vanadium electrolyte concentration testing device, wherein the miniature vanadium battery is used for testing the concentration of vanadium electrolyte and comprises a positive electrode cover, a negative electrode cover and an ion exchange membrane, and the miniature vanadium battery mainly relates to a small vanadium battery and electrolyte concentration test, and does not relate to the rapid detection of batch preparation of electrolyte. The prior art also provides a method for producing electrolyte by adopting a series connection mode of electric piles, which can enlarge the reaction area, improve the reaction speed and shorten the production period, but the electrolytic device does not relate to the determination of the production end point of the electrolyte.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: how to realize the rapid detection of the production end point of the vanadium electrolyte.
In order to solve the technical problem, the utility model provides a detection apparatus for vanadium electrolyte production terminal, include: a reference electrolyte storage tank, a reference battery, a voltage tester and a delivery pump which are connected by a hydraulic pipeline;
the reference electrolyte storage tank is used for storing reference electrolyte;
the voltage tester is used for measuring the open-circuit voltage of the reference cell.
Alternatively, the reference electrolyte has a valence of 3.5;
the concentration range of sulfate ions is 1.0-5.0 mol/L;
the concentration range of vanadium ions is 1.5-3.0 mol/L.
Optionally, the reference cell is a single cell;
the reference cell includes a positive electrode, a negative electrode, a separator, and a fastener.
Optionally, the anode of the reference battery is connected with the electrolyte to be measured through a first hydraulic pump, and the cathode of the reference battery is connected with the reference electrolyte through a second hydraulic pump;
and the voltage tester is respectively connected with the anode and the cathode of the reference battery.
Optionally, the reference cell has an effective area of 20cm 2 The single cell of (1);
the reference battery is arranged at the outlet of the electrolyte to be measured;
and the positive electrode solution of the reference battery is connected with the electrolyte to be detected, and the negative electrode solution of the reference battery is connected with the reference solution.
Optionally, the device also comprises an electrolyte production device;
and a liquid outlet of the electrolyte production device is connected with the anode of the reference battery after being converged with an output port of the first hydraulic pump, and the electrolyte production device is used for producing electrolyte to be tested.
Optionally, the first hydraulic pump is an anode pump, and is used for conveying the electrolyte to be measured;
and the second hydraulic pump is a reference liquid delivery pump and is used for delivering reference electrolyte.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by applying the device for detecting the production endpoint of the vanadium electrolyte, the vanadium valence state and vanadium concentration test of the initial electrolyte after chemical reduction can be avoided, the process flow is optimized, and the detection time is greatly saved; the judgment of the electrolysis end point is prevented from being influenced by the change of the electrolysis efficiency. The state of the produced electrolyte can be mastered; the valence state of the electrolyte can be rapidly detected, and the consistency of the electrolyte among batches is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a structural diagram of a device for detecting a production endpoint of a vanadium electrolyte according to an embodiment of the present invention;
fig. 2 is another structural diagram of the device for detecting the production endpoint of the vanadium electrolyte provided by the embodiment of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will be described in detail with reference to the accompanying drawings and embodiments, thereby to how to apply the technical means to solve the technical problem, and to achieve the technical effect of the realization process can be fully understood and implemented.
The detection to current scale vanadium electrolysis production can't the fast judgement produce electrolyte terminal point, electrolyte is consuming time hard not enough, based on the difference of different valence state vanadium ion electrode potential, there is the principle of certain potential difference in the positive negative pole of primary cell, the utility model provides a detection device of vanadium electrolyte production terminal point.
Example one
As shown in fig. 1, for the utility model provides a detection apparatus for vanadium electrolyte production terminal's a structure chart, include: a reference electrolyte storage tank, a reference battery 1, a voltage tester 4 and a delivery pump which are connected by a hydraulic pipeline 6;
the reference electrolyte storage tank is used for storing reference electrolyte 7;
the voltage tester is used for measuring the open-circuit voltage of the reference cell.
In one specific implementation, the reference electrolyte has a valence state of 3.5; the concentration range of sulfate ions is 1.0-5.0 mol/L; the concentration range of the vanadium ions is 1.5-3.0 mol/L.
In one implementation, the reference cell 1 is a single cell; the reference cell 1 includes a positive electrode, a negative electrode, a separator, and a fastener.
Further, the anode of the reference battery 1 is connected with the electrolyte to be measured through a first hydraulic pump 2, and the cathode of the reference battery 1 is connected with the reference electrolyte through a second hydraulic pump 5;
and the voltage tester 4 is respectively connected with the anode and the cathode of the reference battery 1.
Preferably, the device for detecting the production endpoint of the vanadium electrolyte can further comprise an electrolyte production device; the liquid outlet of the electrolyte production device is joined with the output port of the first hydraulic pump 2 and then connected with the anode of the reference battery, and the electrolyte production device is used for producing electrolyte to be tested.
The embodiment of the utility model provides a, design according to the nernst equation:
Figure BDA0003563755720000031
wherein C (Voxi) is the concentration of vanadium in high valence state, and C (Vred) is the concentration of vanadium in low valence state.
It should be noted that the electrode potential of the electrolyte is related to the vanadium valence state, and when the vanadium valence state ratio is changed, the open-circuit voltage of the reference cell is also changed. Therefore, the open-circuit voltage of the reference battery can be used as a real-time monitoring parameter of the average valence state of the vanadium electrolyte, when the electrolyte to be detected has a valence of 3.5, the valence states of the positive electrode electrolyte and the negative electrode electrolyte of the reference battery are consistent, and the open-circuit voltage of the reference battery is 0.
When the detection device is actually used:
(1) in the electrolyte production process, when the valence state of the vanadium electrolyte to be detected is 3.5-5, namely the valence state of the electrolyte at the positive electrode side of the reference battery is 3.5-5, the valence state of the electrolyte at the negative electrode side of the reference battery is 3.5, the valence states of the electrolyte at the positive electrode side and the negative electrode side of the reference battery are inconsistent, and the open-circuit voltage of the reference battery is larger than 0;
(2) along with the electrolysis, the valence state of the electrolyte to be measured, namely the electrolyte on the positive electrode side of the reference battery, gradually approaches to 3.5, and the open-circuit voltage of the reference battery is gradually reduced;
(3) when the valence state of the vanadium electrolyte in the electrolytic cell or the electrolytic pile is 3.5, the valence states of the electrolytes on the positive electrode side and the negative electrode side of the reference battery are consistent, and the open-circuit voltage of the reference battery is 0, namely the electrolysis end point.
By applying the device for detecting the production end point of the vanadium electrolyte, the test of the vanadium valence state and the vanadium concentration of the initial electrolyte after chemical reduction can be avoided, the process flow is optimized, and the detection time is greatly saved; the judgment of the electrolysis end point is prevented from being influenced by the change of the electrolysis efficiency. The state of the produced electrolyte can be mastered; the valence state of the electrolyte can be rapidly detected, and the consistency of the electrolyte among batches is ensured.
Example two
As shown in fig. 2, for another structure diagram of the device for detecting the production endpoint of vanadium electrolyte provided by the embodiment of the present invention, the device includes: a reference electrolyte storage tank, a reference electrolyte delivery pump 5, a reference battery 1, an anode pump 2 and a voltage tester 4 which are connected by a hydraulic pipeline 6;
the reference electrolyte storage tank is used for storing reference electrolyte 7;
the voltage tester is used for measuring the open-circuit voltage of the reference cell.
In one specific implementation, the reference electrolyte has a valence state of 3.5; the concentration range of sulfate ions is 1.0-5.0 mol/L; the concentration range of the vanadium ions is 1.5-3.0 mol/L.
In one implementation, the reference cell 1 is a single cell; the reference cell 1 includes a positive electrode, a negative electrode, a separator, and a fastener.
Further, the anode of the reference battery 1 is connected with the electrolyte to be measured through a first hydraulic pump 2, and the cathode of the reference battery 1 is connected with the reference electrolyte through a second hydraulic pump 5;
and the voltage tester 4 is respectively connected with the anode and the cathode of the reference battery 1.
In a specific implementation mode, the reference cell 1 has an effective area of 20cm 2 The single cell of (1);
the reference cell 1 is mounted in the electrolyte to be measured.
As shown in fig. 2, the positive electrode solution of the reference cell 1 is connected to the electrolyte to be measured, and the negative electrode solution of the reference cell 1 is connected to the reference solution.
And the reference electrolyte storage tank and the reference electrolyte delivery pump are used for storing and delivering the reference electrolyte.
The reference electrolyte is a vanadium ion electrolyte with a valence state of 3.5, a sulfate ion concentration range of 3.0-5.0 mol/L and a vanadium ion concentration range of 1.5-3.0 mol/L.
In one embodiment of the present invention, the reference cell is designed to have an effective area of 20cm 2 The monocell is arranged at an electrolyte outlet to be detected; and the anode solution of the reference battery is connected with the electrolyte to be detected, and the cathode solution of the reference battery is connected with the reference electrolyte. It should be noted that the present invention does not need to limit the effective area of the reference cell, and the effective area listed above is 20cm 2 The embodiment of the present invention is given only as a specific example, and should not be construed as limiting the present invention, and those skilled in the art need to reasonably select or set the effective area of the reference cell according to the specific example.
The anode pump is used for conveying the electrolyte to be tested.
The voltage tester is used for measuring the open-circuit voltage of the anode and the cathode of the reference battery.
In one instance, as shown in figure 2, the hydraulic lines are used to connect between a pump, a reservoir, a reference cell, an electrolyzer or an electrolysis cell stack catholyte inlet.
The average valence of vanadium is 3.5, and the vanadium is added into the positive and negative storage tanks of the vanadium battery in equal volume. The existing large-scale production of vanadium battery electrolyte mainly adopts a chemical reduction-electrolysis method, mainly uses vanadium pentoxide or vanadyl sulfate as a raw material, adopts a reducing agent or a low-valence vanadium compound to gradually reduce the average valence state of vanadium and dissolve the vanadium into an acid solution, determines electrolysis time by detecting the vanadium ion concentration of the electrolyte and the average valence state of vanadium, and finally obtains an initial electrolyte with the average valence state of vanadium of 3.5 by reduction in an electrolysis device. In the above-mentioned route, the concentration of vanadium in each valence state in the mother liquor needs to be detected after reduction to determine the electrolysis end point, which takes a long time, and in addition, in the electrolysis process, the electrolysis efficiency of the electrolysis bath is affected by various factors such as temperature, vanadium migration and the like, and the electrolysis efficiency is different from batch to batch, so that the production end point of the electrolyte is difficult to accurately judge.
The utility model aims to solve the problem that the existing large-scale vanadium electrolysis production technology is insufficient in the production end point of electrolyte electrolysis, and based on the difference of different valence vanadium ion electrode potentials, the anode and cathode of the primary battery have a certain potential difference, so that the device for quickly detecting the production end point of the vanadium electrolyte is provided. By applying the device for detecting the production end point of the vanadium electrolyte, the test of the vanadium valence state and the vanadium concentration of the initial electrolyte after chemical reduction can be avoided, the process flow is optimized, and the detection time is greatly saved; the judgment of the electrolysis end point is prevented from being influenced by the change of the electrolysis efficiency. The state of the produced electrolyte can be mastered; the valence state of the electrolyte can be rapidly detected, and the consistency of the electrolyte among batches is ensured. The detection device can realize timely and accurate judgment of the production end point in the electrolyte production process, does not need to carry out sampling test on the electrolyte according to the traditional detection method, is time-consuming and labor-consuming, greatly saves the detection time of the electrolyte, and improves the electrolyte production efficiency.
Although the embodiments of the present invention have been disclosed, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. Various modifications and changes in form and detail may be made by those skilled in the art without departing from the spirit and scope of the disclosure, but the scope of the disclosure is to be determined by the appended claims.

Claims (6)

1. The utility model provides a detection apparatus of vanadium electrolyte production terminal, its characterized in that includes: a reference electrolyte storage tank, a reference battery, a voltage tester and a delivery pump which are connected by a hydraulic pipeline;
the reference electrolyte storage tank is used for storing reference electrolyte;
the voltage tester is used for measuring the open-circuit voltage of the reference cell.
2. The apparatus for detecting the end point of production of a vanadium electrolyte according to claim 1, wherein the reference cell is a single cell;
the reference cell includes a positive electrode, a negative electrode, a separator, and a fastener.
3. The apparatus for detecting the production endpoint of a vanadium electrolyte according to claim 2,
the anode of the reference battery is connected with the electrolyte to be tested through a hydraulic pipeline where the first hydraulic pump is located, and the cathode of the reference battery is connected with the reference electrolyte through a hydraulic pipeline where the second hydraulic pump is located;
and the voltage tester is respectively connected with the anode and the cathode of the reference battery.
4. The apparatus for detecting the end point of production of a vanadium electrolyte according to claim 3, wherein the reference cell has an effective area of 20cm 2 The single cell of (1);
the reference battery is arranged at an electrolyte outlet to be measured;
and the positive electrode solution of the reference battery is connected with the electrolyte to be detected, and the negative electrode solution of the reference battery is connected with the reference solution.
5. The apparatus for detecting the production endpoint of the vanadium electrolyte according to claim 3, further comprising an electrolyte production apparatus;
and a liquid outlet of the electrolyte production device is connected with the anode of the reference battery after being converged with an output port of the first hydraulic pump, and the electrolyte production device is used for producing electrolyte to be tested.
6. The apparatus for detecting the production endpoint of a vanadium electrolyte according to claim 3,
the first hydraulic pump is an anode pump and is used for conveying electrolyte to be detected;
and the second hydraulic pump is a reference liquid delivery pump and is used for delivering reference electrolyte.
CN202220678214.4U 2022-03-24 2022-03-24 Detection apparatus for vanadium electrolyte production terminal Active CN217304998U (en)

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