CN110048147A - A kind of all-vanadium flow battery pipe-line system having mixed liquid function - Google Patents
A kind of all-vanadium flow battery pipe-line system having mixed liquid function Download PDFInfo
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- CN110048147A CN110048147A CN201910203007.6A CN201910203007A CN110048147A CN 110048147 A CN110048147 A CN 110048147A CN 201910203007 A CN201910203007 A CN 201910203007A CN 110048147 A CN110048147 A CN 110048147A
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- 239000007788 liquid Substances 0.000 title claims abstract description 379
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 7
- 239000003792 electrolyte Substances 0.000 claims abstract description 302
- 238000001514 detection method Methods 0.000 claims description 35
- 238000007599 discharging Methods 0.000 claims description 28
- 238000007726 management method Methods 0.000 claims description 7
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 21
- 230000007547 defect Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract 7
- 238000003487 electrochemical reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04276—Arrangements for managing the electrolyte stream, e.g. heat exchange
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
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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 present invention provides a kind of all-vanadium flow battery pipe-line system for having mixed liquid function, comprising: positive fluid reservoir, cathode fluid reservoir, the first mixed liquid pipeline and the second mixed liquid pipeline；The first mixed liquid pipeline includes positive liquid outlet pipe (3), anode electrolyte delivery pump (5), liquor charging valve (29), the cathode back liquid pipeline (14) for going back to fluid valve (33) and being arranged in the cathode fluid reservoir；The second mixed liquid pipeline includes cathode liquid outlet pipe (4), electrolyte liquid delivery pump (6), liquor charging valve (30), the positive back liquid pipeline (13) for going back to fluid valve (34) and being arranged in the positive fluid reservoir.The pipe-line system enables to the liquid level difference in the fluid reservoir of positive and negative anodes electrolyte substantially zeroed, ensure that the capacity of redox flow battery energy storage system is maintained at stable state for a long time, avoids the defect for threatening system safety operation.
Description
Technical Field
The invention relates to the technical field of flow battery energy storage, in particular to a flow battery pipeline system with a liquid mixing function.
Background
The flow battery is one of the green and environment-friendly storage batteries which are strongly developed at present, has the obvious advantages of high power, long service life, deep heavy current density charging and discharging and the like, has become one of the main commercial development directions in a battery system, and has extremely wide application prospects in the fields of wind power, photovoltaic power generation, power grid peak regulation and the like.
The significant differences of flow batteries compared to other non-flow batteries are: the redox flow battery needs to respectively adopt positive and negative electrolyte magnetic force to drive a circulating pump to convey electrolyte in positive and negative electrolyte storage tanks to a galvanic pile along a pipeline so as to generate electric energy, and the positive and negative electrolyte flows through the galvanic pile and then is conveyed to the positive and negative electrolyte storage tanks along the pipeline.
At present, when the flow battery runs, the liquid level heights in the positive and negative electrolyte storage tanks are inconsistent. The large liquid level difference causes the capacity of the flow battery energy storage system to be reduced, and even threatens the safe operation of the system.
Disclosure of Invention
The invention provides an all-vanadium redox flow battery pipeline system with a liquid mixing function, which aims to solve the problem of capacity reduction of an energy storage system caused by overlarge liquid level difference in a liquid storage tank of positive and negative electrolytes when a conventional redox flow battery operates.
The invention provides an all-vanadium redox flow battery pipeline system with a liquid mixing function, which comprises:
the device comprises a positive liquid storage tank, a negative liquid storage tank, a first liquid mixing pipeline and a second liquid mixing pipeline;
the first liquid mixing pipeline comprises an anode liquid outlet pipeline 3, an anode electrolyte delivery pump 5, a liquid delivery valve 29, a liquid return valve 33 and a cathode liquid return pipeline 14 arranged in the cathode liquid storage tank;
the second liquid mixing pipeline comprises a negative liquid outlet pipeline 4, a negative electrolyte delivery pump 6, a liquid delivery valve 30, a liquid return valve 34 and a positive liquid return pipeline 13 arranged in the positive liquid storage tank; wherein,
when mixing the liquid, the positive electrolyte flows out of the positive liquid storage tank and sequentially flows through the positive electrolyte delivery pump 5, the liquid delivery valve 29, the liquid return valve 33 and the negative liquid return pipeline 14 to enter the negative liquid storage tank;
when mixing the liquid, the negative electrolyte flows out of the negative liquid storage tank and flows into the positive liquid storage tank through the negative electrolyte delivery pump 6, the liquid delivery valve 30, the liquid return valve 34 and the positive liquid return pipeline 13 in sequence.
In particular, in the system, the first and second sensors,
the opening and closing of the liquid feeding valve 29 are independently controlled;
the opening and closing of the liquid feeding valve 30 are independently controlled;
the opening and closing of the liquid return valve 33 are independently controlled;
the opening and closing of the liquid return valve 34 are independently controlled;
the opening and closing of the anode electrolyte delivery pump 5 are independently controlled;
the opening and closing of the negative electrolyte delivery pump 6 are independently controlled;
or
The opening and closing of the liquid feeding valve 29 and the opening and closing of the liquid feeding valve 30 are controlled in a linkage manner;
the opening and closing of the liquid return valve 33 and the opening and closing of the liquid return valve 34 are controlled in a linkage manner;
the start and stop of the positive electrolyte delivery pump 5 and the start and stop of the negative electrolyte delivery pump 6 are controlled in a linkage manner.
Specifically, the system further includes:
a bypass electric pile, a first state detection pipeline and a second state detection pipeline;
the first state detection pipeline comprises a bypass galvanic pile liquid inlet valve 31, a first branch point A1 is arranged on a pipeline behind the liquid sending valve 29 along the flowing direction of the positive electrolyte, and the bypass galvanic pile liquid inlet valve 31 and the liquid returning valve 33 are respectively arranged on two branch pipelines which are branched from the first branch point A1;
when the valence state is detected, the liquid return valve 33 is in a closed state, and the anode electrolyte sequentially flows through the anode electrolyte delivery pump 5, the liquid delivery valve 29, the first branch point A1 and the bypass pile liquid inlet valve 31 to enter the bypass pile;
the first valence state detection pipeline also comprises a bypass galvanic pile liquid outlet valve 36;
the positive electrode liquid return pipeline 13 comprises a second branch point a2, and the bypass stack liquid outlet valve 36 and the liquid return valve 34 are respectively arranged on two branch pipelines which are branched from the second branch point a 2;
when the valence state is detected, the liquid return valve 34 is in a closed state, and the positive electrolyte flowing out of the bypass pile sequentially flows through the bypass pile liquid outlet valve 36, the second branch point A2 and the positive liquid return pipeline 13 to enter the positive liquid storage tank;
the second state detection pipeline comprises a bypass galvanic pile liquid inlet valve 32, a third branch point A3 is arranged on the pipeline behind the liquid feeding valve 30 along the flowing direction of the positive electrolyte, and the bypass galvanic pile liquid inlet valve 32 and the liquid returning valve 34 are respectively arranged on two branch pipelines branched from the third branch point A3;
when the valence state is detected, the liquid return valve 34 is in a closed state, and the negative electrolyte sequentially flows through the negative electrolyte delivery pump 6, the liquid delivery valve 30, the third branch point A3 and the bypass pile liquid inlet valve 32 to enter the bypass pile;
the second state detection pipeline also comprises a bypass electric pile liquid outlet valve 35;
the negative liquid return pipeline 14 comprises a fourth branch point A4, and the bypass pile liquid outlet valve 35 and the liquid return valve 33 are respectively arranged on two branch pipelines which are respectively branched from the fourth branch point A4;
during valence state detection, the liquid return valve 33 is in a closed state, and the cathode electrolyte flowing out of the bypass pile sequentially flows through the bypass pile liquid outlet valve 35, the fourth fulcrum A4 and the cathode liquid return pipeline 14 to enter the cathode liquid storage tank.
In particular, in the system, the first and second sensors,
the start and stop of the anode electrolyte delivery pump 5 and the start and stop of the cathode electrolyte delivery pump 6 are controlled in a linkage manner;
the opening and closing of the liquid feeding valve 29 and the opening and closing of the liquid feeding valve 30 are controlled in a linkage manner;
the opening and closing of the bypass galvanic pile liquid inlet valve 32 and the opening and closing of the bypass galvanic pile liquid inlet valve 31 are controlled in a linkage manner;
the opening and closing of the bypass stack liquid outlet valve 35 and the opening and closing of the bypass stack liquid outlet valve 36 are controlled in a linkage manner.
The flow battery pipeline system with the liquid mixing function provided by the invention can overcome the problem of inconsistent liquid level in the positive and negative electrolyte storage tanks of the flow battery in operation, so that the liquid level difference in the positive and negative electrolyte storage tanks is basically zero, the capacity of the flow battery energy storage system is ensured to be kept in a stable state for a long time, and the defect that the safe operation of the system is threatened is avoided.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a topology structure diagram of an energy storage system of a flow battery in this embodiment;
fig. 2 shows the positive electrolyte passage in the normal working state of the energy storage system of the flow battery in this embodiment;
fig. 3 shows the negative electrolyte passage in the normal operating state of the energy storage system of the flow cell in this embodiment;
fig. 4 is a diagram illustrating the anode electrolyte path in the electrolyte valence state detection state of the energy storage system of the flow cell in this embodiment;
fig. 5 is a diagram illustrating the negative electrolyte path in the electrolyte valence state detection state of the energy storage system of the flow cell according to the embodiment;
FIG. 6 is a diagram illustrating the electrolyte passage of the positive electrode in the state of detecting the amount of electrolyte in the energy storage system of the flow battery according to the embodiment;
fig. 7 shows the negative electrolyte passage in the state of detecting the electrolyte amount of the energy storage system of the flow battery in this embodiment.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
When the flow battery runs normally, the electrolyte is always in a flowing state; therefore, after the system is operated for a period of time, the liquid level difference that the liquid levels in the positive electrolyte storage tank and the negative electrolyte storage tank are inconsistent can cause the capacity of the energy storage system of the redox flow battery to be reduced, and even threatens the safe operation of the system.
As shown in fig. 6 and 7, the all-vanadium redox flow battery pipeline system with a liquid mixing function according to the embodiment of the present invention includes:
the device comprises a positive liquid storage tank, a negative liquid storage tank, a first liquid mixing pipeline and a second liquid mixing pipeline;
the first liquid mixing pipeline comprises an anode liquid outlet pipeline 3, an anode electrolyte delivery pump 5, a liquid delivery valve 29, a liquid return valve 33 and a cathode liquid return pipeline 14 arranged in the cathode liquid storage tank;
the second liquid mixing pipeline comprises a negative liquid outlet pipeline 4, a negative electrolyte delivery pump 6, a liquid delivery valve 30, a liquid return valve 34 and a positive liquid return pipeline 13 arranged in the positive liquid storage tank; wherein,
when mixing the liquid, the positive electrolyte flows out of the positive liquid storage tank and sequentially flows through the positive electrolyte delivery pump 5, the liquid delivery valve 29, the liquid return valve 33 and the negative liquid return pipeline 14 to enter the negative liquid storage tank;
when mixing the liquid, the negative electrolyte flows out of the negative liquid storage tank and flows into the positive liquid storage tank through the negative electrolyte delivery pump 6, the liquid delivery valve 30, the liquid return valve 34 and the positive liquid return pipeline 13 in sequence.
Specifically, in this system, when the liquid level difference is adjusted,
the opening and closing of the liquid feeding valve 29 are independently controlled;
the opening and closing of the liquid feeding valve 30 are independently controlled;
the opening and closing of the liquid return valve 33 are independently controlled;
the opening and closing of the liquid return valve 34 are independently controlled;
the opening and closing of the anode electrolyte delivery pump 5 are independently controlled;
the opening and closing of the negative electrolyte delivery pump 6 is independently controlled.
Therefore, electrolyte with consistent price and preparation can be independently conveyed from the anode liquid storage tank to the cathode liquid storage tank according to the liquid level condition.
Specifically, in the system, when mixing the liquid, that is, in the process of making the price of the electrolytes in the anode liquid storage tank and the cathode liquid storage tank consistent, the opening and closing of the liquid feeding valve 29 and the opening and closing of the liquid feeding valve 30 are controlled in a linkage manner;
the opening and closing of the liquid return valve 33 and the opening and closing of the liquid return valve 34 are controlled in a linkage manner;
the start and stop of the positive electrolyte delivery pump 5 and the start and stop of the negative electrolyte delivery pump 6 are controlled in a linkage manner.
Thereby improving the speed of mixing the electrolyte and making the price of the electrolyte consistent in a short time.
Specifically, the system further includes:
a bypass electric pile, a first state detection pipeline and a second state detection pipeline;
as shown in fig. 4, on one side of the bypass stack, the first state detection pipeline includes a bypass stack liquid inlet valve 31, a first branch point a1 is provided on the pipeline behind the liquid feeding valve 29 along the flowing direction of the positive electrolyte, and the bypass stack liquid inlet valve 31 and the liquid returning valve 33 are respectively provided on two branch pipelines branched from the first branch point a 1;
when the valence state is detected, the liquid return valve 33 is in a closed state, and the anode electrolyte sequentially flows through the anode electrolyte delivery pump 5, the liquid delivery valve 29, the first branch point A1 and the bypass pile liquid inlet valve 31 to enter the bypass pile;
on the other side of the bypass galvanic pile, the first valence state detection pipeline also comprises a bypass galvanic pile liquid outlet valve 36;
the positive electrode liquid return pipeline 13 comprises a second branch point a2, and the bypass stack liquid outlet valve 36 and the liquid return valve 34 are respectively arranged on two branch pipelines which are branched from the second branch point a 2;
when the valence state is detected, the liquid return valve 34 is in a closed state, and the positive electrolyte flowing out of the bypass pile sequentially flows through the bypass pile liquid outlet valve 36, the second branch point A2 and the positive liquid return pipeline 13 to enter the positive liquid storage tank;
as shown in fig. 5, on one side of the bypass stack, the second state detection pipeline includes a bypass stack liquid inlet valve 32, a third branch point A3 is provided on the pipeline behind the liquid feeding valve 30 along the flow direction of the positive electrode electrolyte, and the bypass stack liquid inlet valve 32 and the liquid returning valve 34 are respectively provided on two branch pipelines branched from the third branch point A3;
when the valence state is detected, the liquid return valve 34 is in a closed state, and the negative electrolyte sequentially flows through the negative electrolyte delivery pump 6, the liquid delivery valve 30, the third branch point A3 and the bypass pile liquid inlet valve 32 to enter the bypass pile;
on the other side of the bypass electric pile, the second state detection pipeline also comprises a bypass electric pile liquid outlet valve 35;
the negative liquid return pipeline 14 comprises a fourth branch point A4, and the bypass pile liquid outlet valve 35 and the liquid return valve 33 are respectively arranged on two branch pipelines which are respectively branched from the fourth branch point A4;
during valence state detection, the liquid return valve 33 is in a closed state, and the cathode electrolyte flowing out of the bypass pile sequentially flows through the bypass pile liquid outlet valve 35, the fourth fulcrum A4 and the cathode liquid return pipeline 14 to enter the cathode liquid storage tank.
The branch points are arranged in the pipeline, so that a plurality of branches with determined flow directions are realized, the utilization rate of the pipeline is improved, the total length of the pipeline can be reduced, the on-way loss of electrolyte is reduced, the energy efficiency provided by the pipeline is improved, and the pipeline system is more compact in space.
The first valence state detection pipeline and the second valence state detection pipeline enable electrolyte to return to the initially flowing liquid storage tank after passing through the bypass galvanic pile, so that the electrochemical reaction in the bypass galvanic pile can truly simulate the working condition in the main galvanic pile, the valence detection is realized by using smaller bypass capacity, the accuracy is high, and the speed is high.
It should be understood that, in the first state detection line and the second state detection line,
the start and stop of the anode electrolyte delivery pump 5 and the start and stop of the cathode electrolyte delivery pump 6 are controlled in a linkage manner;
the opening and closing of the liquid feeding valve 29 and the opening and closing of the liquid feeding valve 30 are controlled in a linkage manner;
the opening and closing of the bypass galvanic pile liquid inlet valve 32 and the opening and closing of the bypass galvanic pile liquid inlet valve 31 are controlled in a linkage manner;
the opening and closing of the bypass stack liquid outlet valve 35 and the opening and closing of the bypass stack liquid outlet valve 36 are controlled in a linkage manner.
Specifically, the system further includes:
the system comprises a main pile, a positive electrolyte charging and discharging pipeline and a negative electrolyte charging and discharging pipeline;
as shown in fig. 2, the positive electrolyte charge-discharge pipeline includes a main stack liquid inlet valve 25;
on one side of the main electric pile, the positive liquid outlet pipeline 3 comprises a fifth branch point A5, and the liquid feeding valve 29 and the main electric pile liquid inlet valve 25 are respectively arranged on two branch pipelines which are branched from the fifth branch point A5;
during charging and discharging, the liquid return valve 33 is in a closed state, the liquid feeding valve 29 is in a closed state, and the positive electrolyte sequentially flows through the fifth branch point A5 and the main electric pile liquid inlet valve 25 to enter the main electric pile;
on the other side of the main electric pile, the anode electrolyte charging and discharging pipeline also comprises a main electric pile liquid outlet valve 28;
a sixth branch point a6 is included in the branch pipe between the second branch point a2 and the bypass stack outlet valve 36; the main electric pile liquid outlet valve 28 and the bypass electric pile liquid outlet valve 36 are arranged on two branch pipes branched from the sixth branch point a 6;
during charging and discharging, the liquid return valve 34 is in a closed state, the bypass stack liquid outlet valve 36 is closed, and the positive electrolyte flowing out of the main stack sequentially flows through the main stack liquid outlet valve 28, the sixth branch point a6, the second branch point a2 and the positive liquid return pipeline 13 to enter the positive liquid storage tank;
as shown in fig. 3, the negative electrolyte charge and discharge line includes a main stack inlet valve 26;
on one side of the main electric pile, the cathode liquid outlet pipe 4 comprises a seventh branch point a7, and the liquid feeding valve 30 and the main electric pile liquid inlet valve 26 are respectively arranged on two branch pipes branched from the seventh branch point a 7;
during charging and discharging, the liquid return valve 34 is in a closed state, the liquid feeding valve 30 is in a closed state, and the positive electrolyte sequentially flows through the seventh branch point a7 and the main stack liquid inlet valve 26 to enter the main stack;
on the other side of the main electric pile, the negative electrolyte charging and discharging pipeline also comprises a main electric pile liquid outlet valve 27;
the branch pipeline between the fourth branch point a4 and the bypass stack liquid outlet valve 35 comprises an eighth branch point A8; the main electric pile liquid outlet valve 27 and the bypass electric pile liquid outlet valve 35 are arranged on two branch pipes branched from the eighth branch point A8;
during charging and discharging, the liquid return valve 33 is in a closed state, the bypass stack liquid outlet valve 35 is closed, and the negative electrolyte flowing out of the main stack sequentially flows through the main stack liquid outlet valve 27, the eighth branch point A8, the fourth branch point a4 and the negative liquid return pipeline 14 to enter the negative liquid storage tank.
The positive electrolyte charging and discharging pipeline and the negative electrolyte charging and discharging pipeline both enable the electrolyte to flow into the corresponding liquid storage tank after passing through the main stack without passing through the bypass stack, and electrochemical reaction is completed in the main stack.
The branch points are arranged in the pipeline, so that a plurality of branches with determined flow directions are realized, the utilization rate of the pipeline is improved, the total length of the pipeline can be reduced, the on-way loss of electrolyte is reduced, the energy efficiency provided by the pipeline is improved, and the pipeline system is more compact in space.
Specifically, in the positive electrolyte charging and discharging pipeline and the negative electrolyte charging and discharging pipeline,
the start and stop of the anode electrolyte delivery pump 5 and the start and stop of the cathode electrolyte delivery pump 6 are controlled in a linkage manner;
the opening and closing of the main electric reactor liquid inlet valve 26 and the opening and closing of the main electric reactor liquid inlet valve 25 are controlled in a linkage manner;
the opening and closing of the main electric pile liquid outlet valve 27 and the opening and closing of the main electric pile liquid outlet valve 28 are controlled in a linkage manner.
The positive electrolyte charging and discharging pipeline and the negative electrolyte charging and discharging pipeline are simultaneously linked and controlled, so that the full and balanced electrochemical reaction of the electrolyte in the main electric pile can be ensured, and the phenomenon of inconsistent liquid level height can be reduced.
Specifically, the system further includes:
a liquid level sensor 21 arranged in the cathode electrolyte storage tank and used for acquiring the liquid level in real time;
a liquid level sensor 22 arranged on the anode electrolyte storage tank for collecting the liquid level in real time.
In particular, in the system, the first and second sensors,
the capacity of the bypass electric pile is 5% -10% of the capacity of the main electric pile.
Specifically, the system further includes:
a battery management system 37, electrically connected to the liquid level sensor 21 and the liquid level sensor 22, for calculating the liquid level difference between the negative electrolyte tank and the positive electrolyte tank, and when the liquid level difference is not less than a preset first threshold value,
after the liquid return valve 33 and the liquid return valve 34 are controlled to be closed, the first state detection line and the second state detection line are controlled to be simultaneously input.
In particular, in the system, the first and second sensors,
the battery management system BMS is also used for calculating the liquid level difference between the negative electrolyte storage tank and the positive electrolyte storage tank, and when the liquid level difference is not more than a preset second threshold value,
after the liquid inlet valve 29 and the liquid inlet valve 30 are controlled to be closed, after the liquid return valve 33 and the liquid return valve 34 are controlled to be closed, and after the bypass pile liquid outlet valve 35 and the bypass pile liquid outlet valve 36 are controlled to be closed, the negative electrolyte charging and discharging pipeline and the negative and positive electrolyte charging and discharging pipeline are controlled to be simultaneously put into operation; wherein the second threshold is less than the first threshold.
The flow battery pipeline system with the liquid mixing function can overcome the problem of inconsistent liquid level in the positive and negative electrolyte storage tanks of the flow battery in operation, so that the liquid level difference in the positive and negative electrolyte storage tanks is basically zero, the capacity of the flow battery energy storage system is ensured to be kept in a stable state for a long time, and the defect that the safe operation of the system is threatened is avoided.
The pipeline system provided by the embodiment of the invention can start mixed liquid management, adjust the price and restart the electrochemical reaction in the main galvanic pile after adjusting the price according to the liquid level difference of the positive and negative electrolyte liquid storage tanks of the redox flow battery system; the ionic valence state of the electrolyte is detected by the bypass galvanic pile in the liquid mixing process, so that the influence on the main galvanic pile in the liquid mixing process is reduced.
Fig. 1 is a topological structure of a flow battery pipeline system with a liquid mixing function in this embodiment. A main stack 23 for generating direct current power through electrochemical reaction of the electrolyte; the positive electrolyte inlet main pile pipeline electromagnetic valve 25 is positioned between the positive electrolyte outlet pump pipeline 7 and the positive electrolyte inlet main pile pipeline 9 and is used for controlling the connection and disconnection between the positive electrolyte outlet pump pipeline 7 and the positive electrolyte inlet main pile pipeline 9; the cathode electrolyte inlet and outlet tank pipeline electromagnetic valve 27 is positioned between the cathode electrolyte outlet main reactor pipeline 12 and the cathode electrolyte inlet tank pipeline 14 and is used for controlling the on-off between the cathode electrolyte outlet main reactor pipeline 12 and the cathode electrolyte inlet tank pipeline 14;
the number 1 electromagnetic valve 29 of the anode electrolyte inlet bypass pile pipeline is positioned between the anode electrolyte outlet pump pipeline 7 and the anode electrolyte inlet bypass pile pipeline 15 and is used for controlling the on-off between the anode electrolyte outlet pump pipeline 7 and the anode electrolyte inlet bypass pile pipeline 15;
the No. 2 electromagnetic valve 31 of the positive electrolyte bypass electric pile inlet pipeline is positioned between the positive electrolyte bypass electric pile inlet pipeline 15 and the bypass electric pile 24 and is used for controlling the on-off of the positive electrolyte bypass electric pile inlet pipeline 15 and the bypass electric pile 24;
the electromagnetic valve 33 of the positive electrolyte and negative electrolyte tank inlet pipeline is positioned between the positive electrolyte and negative electrolyte tank inlet pipeline 19 and the negative electrolyte tank inlet pipeline 14 and is used for controlling the on-off between the positive electrolyte and negative electrolyte tank inlet pipeline 19 and the negative electrolyte tank inlet pipeline 14;
the cathode electrolyte outlet bypass pile pipeline electromagnetic valve 35 is positioned between the cathode electrolyte outlet bypass pile pipeline 18 and the cathode electrolyte inlet tank pipeline 14 and is used for controlling the connection and disconnection between the cathode electrolyte outlet bypass pile pipeline 18 and the cathode electrolyte inlet tank pipeline 14;
the positive electrolyte inlet bypass pile pipeline 15 is directly connected with a positive electrolyte inlet negative electrolyte inlet tank pipeline 19;
the negative electrolyte outlet bypass pile pipeline 18 is directly connected with a bypass pile 24;
the negative electrolyte inlet main pile pipeline electromagnetic valve 26 is positioned between the negative electrolyte outlet pump pipeline 8 and the negative electrolyte inlet main pile pipeline 10 and is used for controlling the on-off between the negative electrolyte outlet pump pipeline 8 and the negative electrolyte inlet main pile pipeline 10;
the positive electrolyte in-positive electrolyte tank pipeline electromagnetic valve 28 is positioned between the positive electrolyte out-of-main reactor pipeline 11 and the positive electrolyte in-tank pipeline 13, and is used for controlling the on-off of the positive electrolyte out-of-main reactor pipeline 11 and the positive electrolyte in-tank pipeline 13;
the electromagnetic valve No. 1 of the cathode electrolyte inlet bypass pile pipeline is positioned between the cathode electrolyte outlet pump pipeline 8 and the cathode electrolyte inlet bypass pile pipeline 16 and is used for controlling the on-off between the cathode electrolyte outlet pump pipeline 8 and the cathode electrolyte inlet bypass pile pipeline 16;
the No. 2 electromagnetic valve 32 of the negative electrolyte bypass electric pile inlet pipeline is positioned between the negative electrolyte bypass electric pile inlet pipeline 16 and the bypass electric pile 24 and is used for controlling the on-off of the negative electrolyte bypass electric pile inlet pipeline 16 and the bypass electric pile 24;
the electromagnetic valve 34 of the cathode electrolyte and anode electrolyte tank inlet pipeline is positioned between the cathode electrolyte and anode electrolyte tank inlet pipeline 20 and the anode electrolyte tank inlet pipeline 13 and is used for controlling the on-off between the cathode electrolyte and anode electrolyte tank inlet pipeline 20 and the anode electrolyte tank inlet pipeline 13;
the positive electrolyte outlet bypass pile pipeline electromagnetic valve 36 is positioned between the positive electrolyte outlet bypass pile pipeline 17 and the positive electrolyte tank inlet pipeline 13 and is used for controlling the connection and disconnection between the positive electrolyte outlet bypass pile pipeline 17 and the positive electrolyte tank inlet pipeline 13;
the negative electrolyte inlet bypass pile pipeline 16 is directly connected with a negative electrolyte inlet positive electrolyte tank pipeline 20;
the positive electrolyte outlet bypass stack pipe 17 is directly connected with a bypass stack 24.
The bypass electric pile 24 is used for generating direct current voltage through the electrochemical reaction of the electrolyte, and the direct current voltage value is used for judging the valence state of the electrolyte by a battery management system;
the liquid level sensor 21 of the positive electrolyte storage tank is used for measuring the liquid level height of the positive electrolyte in the positive electrolyte storage tank 1;
the negative electrolyte tank level sensor 22 is used for measuring the height of the negative electrolyte level in the negative electrolyte tank 2;
the battery management system 37 is used for judging the liquid level difference of the positive and negative liquid storage tanks, controlling the opening and closing of the electromagnetic valve and controlling the electrolyte to drive the circulating pump by magnetic force.
As shown in fig. 2, the flow cell energy storage system is in a normal working state, the positive electrolyte magnetically drives the circulating pump 5, the positive electrolyte in the positive electrolyte storage tank 1 is conveyed to the positive electrolyte outlet pump pipeline 7 along the positive electrolyte outlet tank pipeline 3, then flows through the positive electrolyte inlet main stack pipeline electromagnetic valve 25, then flows through the positive electrolyte inlet main stack pipeline 9, and is conveyed to the main stack 23, flows through the main stack 23, and then flows through the positive electrolyte outlet main stack pipeline 11, flows through the positive electrolyte inlet tank pipeline electromagnetic valve 28, and flows through the positive electrolyte inlet tank pipeline 13, and is conveyed to the positive electrolyte storage tank 1.
As shown in fig. 3, the flow cell energy storage system is in a normal working state, the circulating pump 6 is driven by the cathode electrolyte magnetic force, the cathode electrolyte in the cathode electrolyte storage tank 2 is conveyed to the cathode electrolyte outlet pump pipeline 8 along the cathode electrolyte outlet tank pipeline 4, then flows through the cathode electrolyte inlet main stack pipeline electromagnetic valve 26 and then flows through the cathode electrolyte inlet main stack pipeline 10 to the main stack 23, flows through the main stack 23 and then flows through the cathode electrolyte outlet main stack pipeline 12, flows through the cathode electrolyte inlet tank pipeline electromagnetic valve 27, and flows through the cathode electrolyte inlet tank pipeline 14 to the cathode electrolyte storage tank 2.
As shown in fig. 4, the flow cell energy storage system is in an electrolyte valence state detection state, the positive electrolyte magnetically drives the circulating pump 5, the positive electrolyte in the positive electrolyte storage tank 1 is conveyed to the positive electrolyte outlet pump pipeline 7 along the positive electrolyte outlet tank pipeline 3, then flows through the electromagnetic valve 29 No. 1 of the positive electrolyte inlet bypass pile pipeline, the positive electrolyte inlet bypass pile pipeline 15, the electromagnetic valve 31 No. 2 of the positive electrolyte inlet bypass pile pipeline and is conveyed to the bypass pile 24, flows through the bypass pile 24 and then flows through the bypass pile pipeline 17, the electromagnetic valve 36 of the positive electrolyte outlet bypass pile pipeline and the positive electrolyte inlet tank pipeline 13 to the positive electrolyte storage tank 1.
As shown in fig. 5, the flow cell energy storage system is in an electrolyte valence state detection state, the circulating pump 6 is driven by the cathode electrolyte magnetic force, the cathode electrolyte in the cathode electrolyte storage tank 2 is conveyed to the cathode electrolyte outlet pump pipeline 8 along the cathode electrolyte outlet tank pipeline 4, then flows through the solenoid valve 30 No. 1 of the cathode electrolyte inlet bypass pile pipeline, the cathode electrolyte inlet bypass pile pipeline 16, the solenoid valve 32 No. 2 of the cathode electrolyte inlet bypass pile pipeline is conveyed to the bypass pile 24, flows through the solenoid valve 18 along the cathode electrolyte outlet bypass pile pipeline 18, the solenoid valve 35 of the cathode electrolyte outlet bypass pile pipeline, and the cathode electrolyte inlet tank pipeline 14 is conveyed to the cathode electrolyte storage tank 2.
As shown in fig. 6, the redox flow battery energy storage system is in the electrolyte volume detection state, positive electrolyte magnetic force drives the circulating pump 5, the positive electrolyte in the positive electrolyte liquid storage tank 1 is conveyed to the positive electrolyte pump-out pipeline 7 along the positive electrolyte tank-out pipeline 3, then the positive electrolyte flows through the electromagnetic valve 29 No. 1 of the positive electrolyte bypass inlet pile pipeline, the positive electrolyte inlet pile pipeline 15, the positive electrolyte inlet negative electrolyte inlet tank pipeline 19, the positive electrolyte inlet negative electrolyte inlet tank pipeline electromagnetic valve 33, and the negative electrolyte inlet tank pipeline 14 is conveyed to the negative electrolyte liquid storage tank 2.
As shown in fig. 7, the redox flow battery energy storage system is in the electrolyte amount detection state, the negative electrolyte magnetic force drives the circulating pump 6, the negative electrolyte in the negative electrolyte storage tank 2 is conveyed to the negative electrolyte outlet pump pipeline 8 along the negative electrolyte outlet tank pipeline 4, then the negative electrolyte flows through the electromagnetic valve 30 No. 1 of the negative electrolyte inlet bypass pile pipeline, the negative electrolyte inlet bypass pile pipeline 16, the negative electrolyte inlet positive electrolyte inlet tank pipeline 20, the negative electrolyte inlet positive electrolyte inlet tank pipeline electromagnetic valve 34, and the positive electrolyte inlet tank pipeline 13 is conveyed to the positive electrolyte storage tank 1.
In a complete liquid level difference adjusting cycle, the pipeline system firstly works in the states of fig. 6 and 7, liquid mixing is carried out, and liquid level difference adjustment is not carried out; subsequently, the pipeline system works in the states of fig. 4 and 5, and whether the mixed liquid enables the valence states to be consistent or not is judged by monitoring the voltage of the bypass electric pile; if the valence states are consistent, the pipeline system is enabled to work in the state shown in the figure 6 or the figure 7 again, and the liquid level difference is adjusted; after the liquid level difference meets the requirement, the pipeline system works in the state shown in fig. 2 and 3, and the pre-charging function of the energy storage system is realized.
The invention has been described above by reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of the device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (10)
1. The utility model provides an all vanadium redox flow battery pipe-line system that possesses function of mixing liquid which characterized in that includes:
the device comprises a positive liquid storage tank, a negative liquid storage tank, a first liquid mixing pipeline and a second liquid mixing pipeline;
the first liquid mixing pipeline comprises an anode liquid outlet pipeline (3), an anode electrolyte delivery pump (5), a liquid delivery valve (29), a liquid return valve (33) and a cathode liquid return pipeline (14) arranged in the cathode liquid storage tank;
the second liquid mixing pipeline comprises a negative liquid outlet pipeline (4), a negative electrolyte delivery pump (6), a liquid delivery valve (30), a liquid return valve (34) and a positive liquid return pipeline (13) arranged in the positive liquid storage tank; wherein,
when the liquid is mixed, the positive electrolyte flows out of the positive liquid storage tank and sequentially flows through a positive electrolyte delivery pump (5), a liquid delivery valve (29), a liquid return valve (33) and a negative liquid return pipeline (14) to enter a negative liquid storage tank;
the negative electrolyte flows out of the negative liquid storage tank and sequentially flows through a negative electrolyte delivery pump (6), a liquid delivery valve (30), a liquid return valve (34) and a positive liquid return pipeline (13) to enter the positive liquid storage tank.
2. The system of claim 1,
the opening and closing of the liquid feeding valve (29) are independently controlled;
the opening and closing of the liquid feeding valve (30) are independently controlled;
the opening and closing of the liquid return valve (33) are independently controlled;
the opening and closing of the liquid return valve (34) are independently controlled;
the opening and closing of the positive electrolyte delivery pump (5) are independently controlled;
the opening and closing of the negative electrolyte delivery pump (6) are independently controlled;
or
The opening and closing of the liquid feeding valve (29) and the opening and closing of the liquid feeding valve (30) are controlled in a linkage manner;
the opening and closing of the liquid return valve (33) and the opening and closing of the liquid return valve (34) are controlled in a linkage manner;
the opening and closing of the anode electrolyte delivery pump (5) and the opening and closing of the cathode electrolyte delivery pump (6) are controlled in a linkage manner.
3. The system of claim 1, further comprising:
a bypass electric pile, a first state detection pipeline and a second state detection pipeline;
the first-state detection pipeline comprises a bypass galvanic pile liquid inlet valve (31), a first branch point (A1) is arranged on a pipeline behind the liquid sending valve (29) along the flowing direction of the anode electrolyte, and the bypass galvanic pile liquid inlet valve (31) and the liquid returning valve (33) are respectively arranged on two branch pipelines which are divided from the first branch point (A1);
when the valence state is detected, the liquid return valve (33) is in a closed state, and the anode electrolyte sequentially flows through the anode electrolyte delivery pump (5), the liquid delivery valve (29), the first branch point (A1) and the bypass pile liquid inlet valve (31) and enters the bypass pile;
the first valence state detection pipeline also comprises a bypass electric pile liquid outlet valve (36);
the positive electrode liquid return pipeline (13) comprises a second branch point (A2), and the bypass electric pile liquid outlet valve (36) and the liquid return valve (34) are respectively arranged on two branch pipelines which are branched from the second branch point (A2);
when the valence state is detected, the liquid return valve (34) is in a closed state, and the anode electrolyte flowing out of the bypass electric pile sequentially flows through the bypass electric pile liquid outlet valve (36), the second branch point (A2) and the anode liquid return pipeline (13) to enter the anode liquid storage tank;
the second state detection pipeline comprises a bypass electric pile liquid inlet valve (32), a third branch point (A3) is arranged on a pipeline behind the liquid conveying valve (30) along the flowing direction of the positive electrolyte, and the bypass electric pile liquid inlet valve (32) and the liquid return valve (34) are respectively arranged on two branch pipelines branched from the third branch point (A3);
when the valence state is detected, the liquid return valve (34) is in a closed state, and the negative electrolyte sequentially flows through the negative electrolyte delivery pump (6), the liquid delivery valve (30), the third branch point (A3) and the bypass pile liquid inlet valve (32) and enters the bypass pile;
the second state detection pipeline also comprises a bypass electric pile liquid outlet valve (35);
the negative pole liquid return pipeline (14) comprises a fourth branch point (A4), and the bypass electric pile liquid outlet valve (35) and the liquid return valve (33) are respectively arranged on two branch pipelines which are separated from the fourth branch point (A4);
when the valence state is detected, the liquid return valve (33) is in a closed state, and the cathode electrolyte flowing out of the bypass galvanic pile sequentially flows through the bypass galvanic pile liquid outlet valve (35), the fourth fulcrum (A4) and the cathode liquid return pipeline (14) to enter the cathode liquid storage tank.
4. The system of claim 3,
the start and stop of the anode electrolyte delivery pump (5) and the start and stop of the cathode electrolyte delivery pump (6) are controlled in a linkage manner;
the opening and closing of the liquid feeding valve (29) and the opening and closing of the liquid feeding valve (30) are controlled in a linkage manner;
the opening and closing of the bypass galvanic pile liquid inlet valve (32) and the opening and closing of the bypass galvanic pile liquid inlet valve (31) are controlled in a linkage manner;
the opening and closing of the bypass galvanic pile liquid outlet valve (35) and the opening and closing of the bypass galvanic pile liquid outlet valve (36) are controlled in a linkage mode.
5. The system of claim 3, further comprising:
the system comprises a main pile, a positive electrolyte charging and discharging pipeline and a negative electrolyte charging and discharging pipeline;
the positive electrolyte charging and discharging pipeline comprises a main electric pile liquid inlet valve (25);
the positive pole liquid outlet pipeline (3) comprises a fifth branch point (A5), and the liquid feeding valve (29) and the main electric pile liquid inlet valve (25) are respectively arranged on two branch pipelines which are branched from the fifth branch point (A5);
during charging and discharging, the liquid return valve (33) is in a closed state, the liquid feeding valve (29) is in a closed state, and the positive electrolyte sequentially flows through the fifth branch point (A5) and the main electric pile liquid inlet valve (25) to enter the main electric pile;
the positive electrolyte charging and discharging pipeline also comprises a main electric pile liquid outlet valve (28);
a sixth branch point (A6) is arranged on a branch pipeline between the second branch point (A2) and the bypass stack liquid outlet valve (36); the main electric pile liquid outlet valve (28) and the bypass electric pile liquid outlet valve (36) are arranged on two branch pipelines branched from the sixth branching point (A2);
during charging and discharging, the liquid return valve (34) is in a closed state, the bypass galvanic pile liquid outlet valve (36) is closed, and the positive electrolyte flowing out of the main galvanic pile sequentially flows through the main galvanic pile liquid outlet valve (28), the sixth branch point (A6), the second branch point (A2) and the positive liquid return pipeline (13) to enter the positive liquid storage tank;
the negative electrolyte charging and discharging pipeline comprises a main electric pile liquid inlet valve (26);
the negative pole liquid outlet pipeline (4) comprises a seventh branch point (A7), and the liquid feeding valve (30) and the main pile liquid inlet valve (26) are respectively arranged on two branch pipelines which are branched from the seventh branch point (A7);
during charging and discharging, the liquid return valve (34) is in a closed state, the liquid delivery valve (30) is in a closed state, and positive electrolyte sequentially flows through the seventh branch point (A7) and the main electric pile liquid inlet valve (26) to enter the main electric pile;
the negative electrolyte charging and discharging pipeline also comprises a main electric pile liquid outlet valve (27);
an eighth branch point (A8) is arranged on a branch pipeline between the fourth branch point (A4) and the bypass electric pile liquid outlet valve (35); the main electric pile liquid outlet valve (27) and the bypass electric pile liquid outlet valve (35) are arranged on two branch pipelines branched from the eighth branch point (A8);
during the charge-discharge, return liquid valve (33) are the closed condition, bypass galvanic pile liquid outlet valve (35) are closed, follow the negative pole electrolyte that main galvanic pile flows out flows through main galvanic pile liquid outlet valve (27) in proper order eighth branch point (A8), fourth branch point (A4), negative pole return liquid pipeline (14) get into the negative pole liquid storage pot.
6. The system of claim 5,
the start and stop of the anode electrolyte delivery pump (5) and the start and stop of the cathode electrolyte delivery pump (6) are controlled in a linkage manner;
the opening and closing of the main electric reactor liquid inlet valve (26) and the opening and closing of the main electric reactor liquid inlet valve (25) are controlled in a linkage manner;
the opening and closing of the main electric pile liquid outlet valve (27) and the opening and closing of the main electric pile liquid outlet valve (28) are controlled in a linkage mode.
7. The system of claim 3, further comprising:
a liquid level sensor (21) which is arranged on the cathode electrolyte storage tank and collects the liquid level in real time;
and the liquid level sensor (22) is arranged on the positive electrolyte storage tank and is used for collecting the liquid level in real time.
8. The system of claim 5,
the capacity of the bypass electric pile is 5% -10% of the capacity of the main electric pile.
9. The system of claim 5, further comprising:
a battery management system (37) which is electrically connected with the liquid level sensor (21) and the liquid level sensor (22) and is used for calculating the liquid level difference between the negative electrolyte storage tank and the positive electrolyte storage tank, when the liquid level difference is not less than a preset first threshold value,
and controlling the input of the first state detection pipeline and the second state detection pipeline after controlling the liquid return valve (33) to be closed and the liquid return valve (34) to be closed.
10. The system of claim 5,
the battery management system (37) is further configured to calculate a liquid level difference between the negative electrolyte reservoir and the positive electrolyte reservoir, and when the liquid level difference is not greater than a second predetermined threshold,
after controlling the liquid inlet valve (29) to be closed and the liquid inlet valve (30) to be closed,
after controlling the liquid return valve (33) to close and the liquid return valve (34) to close,
after controlling the bypass stack liquid outlet valve (35) and the bypass stack liquid outlet valve (36) to be closed,
controlling the charging and discharging pipeline of the negative electrolyte and the charging and discharging pipeline of the negative and positive electrolyte to be put into operation at the same time; wherein the second threshold is less than the first threshold.
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