CN118374819A - Apparatus and method for controlling pure water addition amount of electrolytic cell system - Google Patents
Apparatus and method for controlling pure water addition amount of electrolytic cell system Download PDFInfo
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- CN118374819A CN118374819A CN202410615886.4A CN202410615886A CN118374819A CN 118374819 A CN118374819 A CN 118374819A CN 202410615886 A CN202410615886 A CN 202410615886A CN 118374819 A CN118374819 A CN 118374819A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003014 ion exchange membrane Substances 0.000 claims abstract description 8
- 230000004048 modification Effects 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 6
- 238000005868 electrolysis reaction Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 43
- 239000001257 hydrogen Substances 0.000 description 14
- 229910052739 hydrogen Inorganic materials 0.000 description 14
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 13
- 239000000460 chlorine Substances 0.000 description 13
- 229910052801 chlorine Inorganic materials 0.000 description 13
- 239000012267 brine Substances 0.000 description 8
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- JFUIHGAGFMFNRD-UHFFFAOYSA-N fica Chemical compound FC1=CC=C2NC(C(=O)NCCS)=CC2=C1 JFUIHGAGFMFNRD-UHFFFAOYSA-N 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- WDRYRZXSPDWGEB-UHFFFAOYSA-N lonidamine Chemical compound C12=CC=CC=C2C(C(=O)O)=NN1CC1=CC=C(Cl)C=C1Cl WDRYRZXSPDWGEB-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/70—Assemblies comprising two or more cells
-
- 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
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- 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
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/34—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis
- C25B1/46—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
-
- 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
-
- 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
-
- 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
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
- C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
-
- 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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Automation & Control Theory (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a device and a method for controlling pure water addition of an electrolytic tank system. The electrolytic tank system includes a plurality of electrolysis that set up side by side, and every electrolytic tank includes positive pole room, negative pole room, will positive pole room with the ion exchange membrane that negative pole room separates, set up the positive pole in positive pole room, and set up the negative pole in negative pole room, and wherein, the pure water pours into the negative pole room of every electrolytic tank into, and the equipment of control electrolytic tank system's pure water addition includes: a pure water adding module for injecting pure water into the cathode chamber at a variable output flow rate; and a pure water addition amount control module calculating a set flow amount of pure water injected into the cathode chamber based on the current value of each electrolytic cell, the number of unit cells of the electrolytic cell system, and the compensation coefficient, and dynamically adjusting an output flow amount of the pure water addition module based on the calculated set flow amount to control the concentration of the cathode solution in the cathode chamber.
Description
Technical Field
The invention relates to a method and a system for controlling the pure water addition amount of a device for preparing chlorine and hydrogen by electrolyzing brine.
Background
The green electricity produced by the wind energy or photovoltaic power generation device is subjected to brine electrolysis to produce hydrogen, and renewable wind energy and solar energy are converted into chemical energy for storage. The basic principle of preparing chlorine and hydrogen by electrolyzing saline solution through ion exchange method is as follows:
2NaCL+2H2O＝＝＝2NaOH+CL2↑+H2↑
an electrolytic tank for electrolyzing brine by ion exchange membrane method, wherein a positive electrode chamber and a negative electrode chamber are separated by a positive ion exchange membrane. During electrolysis, purified NaCl solution is injected into the anode chamber from the lower part of the electrolytic tank, and water is injected into the cathode chamber. Cl-discharges in the anode chamber to form C1 2, which is released from the top of the electrolyzer, while Na+ carries a small amount of water molecules through the cation exchange membrane to the cathode chamber. H+ discharges in the cathode chamber, generating H 2, which is also evolved from the top of the cell. The liquid in the cathode chamber is called the cathode solution and the liquid in the anode chamber is called the anode solution. The cathode solution concentration is the main control parameter in the electrolysis process and is realized by adding pure water, and fig. 4 is a conventional process control flow chart, which is a cascade control loop. In this system, the cathode solution concentration is used as a primary regulation factor, and the pure water flow rate is used as a secondary regulation parameter. However, there is a large lag in concentration analysis, and the regulation system often fails to adequately perform the regulation due to the failure of the concentration meter.
Therefore, a new technical means or method is needed, which can stably control pure water of the electrolytic cell, so that the concentration of the cathode solution of the electrolytic cell is stable, thereby stabilizing the production and the safety of the device.
Disclosure of Invention
In view of the above, the present invention proposes an apparatus and a method for controlling the pure water addition amount of an electrolytic cell system to solve some or all of the above problems.
According to an embodiment of the present invention, there is provided an apparatus for controlling an amount of pure water added to an electrolytic cell system including a plurality of electrolytic cells arranged side by side, each electrolytic cell including an anode chamber, a cathode chamber, an ion exchange membrane separating the anode chamber and the cathode chamber, an anode provided in the anode chamber, and a cathode provided in the cathode chamber, wherein pure water is injected into the cathode chamber of each electrolytic cell unit, characterized by comprising: a pure water adding module for injecting pure water into the cathode chamber at a variable output flow rate; and a pure water addition amount control module that calculates a set flow amount of pure water to be injected into the cathode chamber based on a current value of each electrolytic cell, the number of unit cells of the electrolytic cell system, and a compensation coefficient, and dynamically adjusts the output flow amount of the pure water addition module based on the calculated set flow amount to control the concentration of the cathode solution in the cathode chamber.
By the above operation, the calculated value of the compensation function block is used as the set value of the cascade regulator, and the calculated value is used to control the flow rate of pure water so that the pure water addition amount is always kept in the optimum state.
Preferably, the pure water addition amount control module includes an information acquisition unit that acquires at least one of: the compensation unit calculates a set flow rate of pure water injected into the cathode chamber based on the information acquired by the information acquisition unit and a compensation coefficient, and the adjustment unit dynamically adjusts the output flow rate of the pure water addition module based on the calculated set flow rate and the flow rate of the cathode solution to control the concentration of the cathode solution in the cathode chamber.
By acquiring the current value of each electrolytic cell and the number of unit cells of the electrolytic cell system, the load of the electrolytic cell can be obtained, and therefore, the flow rate of pure water is controlled based on the load so that the pure water addition amount is always maintained at an optimum state.
Preferably, the pure water addition amount control module further includes a display unit that displays the output flow rate of the pure water addition module, the set flow rate of pure water, the compensation coefficient, and the number of cell units of the electrolytic cell system, wherein the display unit is configured to receive input or modification of the number of cell units of the electrolytic cell system, and the compensation coefficient.
Through the display unit, operators can intuitively browse the load of the electrolytic tank system and the operation of the control equipment, and can adjust each numerical value according to actual demands, so that the pure water adding amount is always kept in an optimal state.
Preferably, the information acquisition unit includes a current sensor.
The current sensor obtains the current value of each electrolytic cell, and the load of the electrolytic cell can be obtained, and therefore, the pure water flow rate is controlled based on the load, so that the pure water addition amount is always kept at an optimum state.
Preferably, the pure water adding module includes: the liquid storage device is used for storing pure water, the valve is connected to the liquid storage device through a pipeline and adjusts the output flow of the liquid storage device under the control of the pure water adding amount control module; and a flow sensor provided on the pipe to detect the output flow of the reservoir and transmit the output flow of the reservoir to the pure water addition control module.
By arranging the valve and the flow sensor, various parameters of the pure water adding module can be fed back in real time, and the operation of the pure water adding module is controlled according to the control signal.
Preferably, the compensation unit calculates the set flow rate of the pure water injected into the cathode chamber based on the following formula:
Fcal＝Kf×0.00213×(NA×KAA+NB×KAB+NC×KAC+ND×KAD)
Wherein Fcal is the set flow calculated by the compensation unit;
kf is a compensation coefficient ranging from 0.5 to 1.5;
KA A is the current value of the first electrolytic cell, KA B is the current value of the second electrolytic cell;
KA C is the current value of the third electrolytic cell, KA D is the current value of the fourth electrolytic cell;
N A is the number of the unit cells of the first electrolytic cell;
N B is the number of the unit cells of the second electrolytic cell;
n C is the number of the unit cells of the third electrolytic cell;
N D is the number of the unit cells of the fourth electrolytic cell.
By the above formula, the load of the electrolytic cell can be taken into consideration, thereby more accurately calculating the set flow rate of pure water injected into the cathode chamber.
According to another embodiment of the present invention, there is provided a method of controlling an amount of pure water added to an electrolytic cell system including a plurality of electrolytic cells arranged side by side, each electrolytic cell including an anode chamber, a cathode chamber, an ion exchange membrane separating the anode chamber and the cathode chamber, an anode provided in the anode chamber, and a cathode provided in the cathode chamber, wherein pure water is injected into the cathode chamber of each electrolytic cell unit, characterized by comprising: a pure water adding step of injecting pure water into the cathode chamber at a variable output flow rate by a pure water adding module; a pure water addition amount control step of calculating, by a pure water addition amount control module, a set flow rate of pure water injected into the cathode chamber based on a current value of each electrolytic cell, the number of unit cells of the electrolytic cell system, and a compensation coefficient, and dynamically adjusting the output flow rate of the pure water addition module based on the calculated set flow rate to control the concentration of the cathode solution in the cathode chamber.
Preferably, the pure water addition amount control step includes the substeps of: an information acquisition step, a compensation step, and an adjustment step, in which at least one of the following is acquired: the current value of each electrolytic cell, the number of unit cells of the electrolytic cell system, the flow rate of the cathode solution, a set flow rate of pure water injected into the cathode chamber is calculated based on the information acquired in the information acquisition step and a compensation coefficient in a compensation step, and the output flow rate of the pure water addition module is dynamically adjusted based on the calculated set flow rate and the flow rate of the cathode solution in the adjustment step to control the concentration of the cathode solution in the cathode chamber.
Preferably, the pure water addition amount control step further includes a display step of displaying the output flow rate of the pure water addition module, the set flow rate of the pure water, the compensation coefficient, and the number of cell units of the electrolytic cell system, wherein in the display step, an input or modification of the number of cell units of the electrolytic cell system, and the compensation coefficient is received.
Preferably, the compensating step calculates the set flow rate of the pure water injected into the cathode chamber based on the following formula:
Fcal＝Kf×0.00213×(NA×KAA+NB×KAB+NC×KAC+ND×KAD)
Wherein Fcal is the set flow calculated by the compensation unit;
kf is a compensation coefficient ranging from 0.5 to 1.5;
KA A is the current value of the first electrolytic cell, KA B is the current value of the second electrolytic cell;
KA C is the current value of the third electrolytic cell, KA D is the current value of the fourth electrolytic cell;
N A is the number of the unit cells of the first electrolytic cell;
N B is the number of the unit cells of the second electrolytic cell;
n C is the number of the unit cells of the third electrolytic cell;
N D is the number of the unit cells of the fourth electrolytic cell.
From the above proposal, the set value of the pure water addition amount is calculated according to the work load of the electrolytic cell, thereby stably controlling the concentration of the cathode solution and keeping the electrolytic cell in the optimal state all the time.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
fig. 1 is a schematic view of a system for preparing chlorine and hydrogen in which a control apparatus according to an embodiment of the present application is disposed.
Fig. 2 is a schematic diagram of a control apparatus for a system for producing chlorine and hydrogen according to an embodiment of the application.
FIG. 3 is a schematic illustration of an electrolyzer unit of an electrolyzer in a system for producing chlorine and hydrogen in accordance with an embodiment of the application.
Fig. 4 is a schematic view showing a conventional apparatus for controlling the pure water addition amount of an electrolytic cell system.
Fig. 5 shows a schematic view of an apparatus for controlling pure water addition amount of an electrolytic cell system according to the present invention.
Fig. 6 shows an interface schematic of a display unit according to the invention.
FIG. 7 shows a flow chart of a method of controlling the pure water addition amount of an electrolytic cell system according to the present invention.
Detailed Description
The following examples illustrate the invention in further detail in order to make the objects, technical solutions and advantages of the invention more apparent.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.
In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.
FIG. 1 is a schematic diagram of a system for producing chlorine and hydrogen in accordance with an embodiment of the application. As shown in fig. 1, the system 1 for producing chlorine and hydrogen comprises an electrolyzer system 10 for electrolyzing a brine solution to produce hydrogen and chlorine, wherein the electrolyzer system 10 may comprise a plurality of electrolyzer units 11 (A, B, C, D four electrolyzer units respectively) arranged side by side. As shown in fig. 3, which is a schematic view of the electrolytic tank units of the brine electrolysis device in the hydrogen production system according to the embodiment of the application, each electrolytic tank unit 11 includes an anode chamber 11A, a cathode chamber 11B, an ion exchange membrane 12 that separates the anode chamber 11A and the cathode chamber 11B, and an anode 13 provided at the anode chamber 11A and a cathode 14 provided at the cathode chamber 11B so as to be opposite to the anode 13, a brine solution (NaCl solution) is injected as an anode solution to the anode chamber 11A of each electrolytic tank unit 11, and an aqueous solution is injected as a cathode solution to the cathode chamber 11B of each electrolytic tank unit. More specifically, a first injection hole H1 is opened at the lower portion of the anode chamber 11A, a sodium chloride solution is injected into the anode chamber 11A through the first injection hole H1, a second injection hole H2 is opened at the lower portion of the cathode chamber 11B to inject water into the cathode chamber 11B, a first gas outlet hole O1 is opened at the upper portion of the anode chamber 11A, chlorine generated in the anode chamber 11A is discharged through the first gas outlet hole O1 to be collected in the chlorine collecting device, a second gas outlet hole O2 is opened at the upper portion of the cathode chamber 11B, and hydrogen generated in the cathode chamber 11B is discharged through the second gas outlet hole O2 to be collected in the hydrogen collecting device.
It should be appreciated that where electricity generated by wind energy or photovoltaic power generation devices applies voltages to the anode and cathode to electrolyze the brine solution in the electrolyzer unit to produce hydrogen and chlorine, i.e., fig. 1 of the present disclosure may also be a chlorine production system.
Preparing the chlorine and hydrogen system 1 may also include providing a first reservoir 20 of brine solution (i.e., anolyte) to the electrolyzer system 10, the first reservoir 20 being connected to the electrolyzer system 10 by a line L1; a second reservoir 30 for providing catholyte solution to the electrolyzer system 10, the second reservoir 30 being connected to the electrolyzer system 10 by a line L3; and a control device 40 connected to the line L3 via the line L2 for inputting a variable flow rate of pure water to the line L3 via the line L2 to control the concentration of the cathode solution supplied to the electrolytic cell system 10 via the line L3.
As an example, as shown in fig. 2, which shows a schematic view of a control apparatus 40 for controlling the amount of pure water added in an electrolytic cell system according to an embodiment of the present application, as shown in fig. 2, the control apparatus 40 may include a pure water adding module 404, the pure water adding module 40 outputting pure water via a line L2 at a variable output flow rate to add pure water to a cathode solution at a variable output flow rate; and a pure water addition amount control module 402 that calculates a set flow amount of pure water to be output based on the current applied to the anode 13 and the cathode 14 and the number of the operated electrolytic cell units 11, and dynamically adjusts the output flow amount of the pure water addition module 404 based on the calculated set flow amount to control the concentration of the cathode solution.
As an example, further as shown in fig. 2, the pure water adding module 404 includes a reservoir 404-2 for storing pure water; a valve 404-4 connected to the reservoir 404-2 via a line L2 and adjusting the output flow rate of the reservoir 404-2 by changing the opening of the valve; and a flow sensor 404-6 provided on the line L2 to detect the output flow of the reservoir 404-2 and send the output flow to the pure water addition control module 402 for use by the pure water addition control module 402 to dynamically adjust the output flow of the reservoir 404-2.
As an example, further as shown in fig. 2, the pure water addition amount control module 402 may include: a display unit 402-2 for displaying the output flow rate of the pure water adding module 404, the set flow rate of the pure water, the compensation coefficient, and the number of cell units of the electrolytic cell system, wherein the display unit may be configured to receive an input or modification of the number of cell units of the electrolytic cell system, and the compensation coefficient; an information acquisition unit 402-4 that acquires at least one of: the current value of each electrolytic cell, the number of unit cells of the electrolytic cell system, the flow rate of the cathode solution, the flow rate of the anode solution; a compensation unit 402-6 for calculating a set flow rate of pure water injected into the cathode chamber based on the information acquired by the information acquisition unit 402-4 and the compensation coefficient; and an adjusting unit 402-8 for dynamically adjusting the output flow rate of the pure water adding module 404 based on the calculated set flow rate and the flow rate of the cathode solution to control the concentration of the cathode solution in the cathode chamber.
Herein, the pure water addition amount control module 402 may be implemented by a computer device including an input unit via which the current applied to the anode 13 and the cathode 14 and the number of the unit cells of the operated electrolytic cell unit 11 may be input to the pure water addition amount control module 402.
The current applied to the anode and the cathode may be measured by current sensors provided across the anode and the cathode of each cell unit, and the current applied to the anode and the cathode may be obtained by other means known to those skilled in the art, as long as the current applied to the anode and the cathode can be obtained, and the manner of obtaining the current is not limited.
As an example, the pure water addition amount control module 402 may include a PID controller, the set flow rate of pure water calculated by the compensation unit 402-6 is taken as a reference input value of the PID controller, the output flow rate sensed by the flow sensor of the cathode solution is taken as a control input value of the PID controller, and then a control signal is outputted as an output signal of the PID controller,
The user interface displayed by the display unit 402-2 is shown in fig. 6, which shows the current pure water addition amount PV of the electrolytic cell system, the number of cell units (NA, NB, NC, ND) of the electrolytic cell system, the compensation coefficient KF, and the compensation value CAL. Further, ALARM WH, ALARM WL, ALARM LL, for example, may indicate a maximum value of the actual output flow rate permitted to the pure water addition module 404 and ALARM WL indicates a minimum value of the actual output flow rate permitted to the pure water addition module 404.
By using the visually displayed user interface, the user can conveniently adjust the compensation coefficient according to the displayed output flow rate, the set flow rate, and the compensation coefficient, thereby making the output flow rate close to the set flow rate, and judging whether the actual output flow rate of the pure water adding module 404 is too high or too low.
The compensation unit 402-6 calculates a set flow rate of pure water injected into the cathode chamber based on the following formula:
Fcal＝Kf×0.00213×(NA×KAA+NB×KAB+NC×KAC+ND×KAD)
Wherein Fcal is a compensation value calculated by the compensation unit when the apparatus for controlling the pure water addition amount of the electrolytic cell system is in an "automatic", "externally set" state;
kf is a compensation coefficient ranging from 0.5 to 1.5;
KA A is the current value of the first electrolytic cell, KA B is the current value of the second electrolytic cell;
KA C is the current value of the third electrolytic cell, KA D is the current value of the fourth electrolytic cell;
n A is the number of the unit cells of the first electrolytic cell;
n B is the number of the unit cells of the second electrolytic cell;
n C is the number of the unit cells of the third electrolytic cell;
N D is the number of the fourth electrolytic cell.
Fig. 4 is a schematic view showing a conventional apparatus for controlling the pure water addition amount of an electrolytic cell system. The conventional means for controlling the pure water addition to the electrolyzer system is a cascade control loop. In fig. 4, a broken line indicates a signal transmission path between the respective members, and a solid line indicates a liquid flow path between the respective members. In this apparatus, the first control unit 302 (for example, may be a differential indication controller, dca) takes the cathode solution concentration as a master factor and controls the flow rate of the cathode solution. Accordingly, the container 306 storing the cathode solution supplies a part of the cathode solution to the electrolytic bath and another part to the cathode solution bath (as indicated by arrow a) under the control of the first control unit 302. The output signal of the first control unit 302 is input to a second control unit 304 (for example, a flow rate indication controller, FICA) which outputs a pure water flow rate control signal as a secondary regulation parameter based on the signal. Accordingly, the container 308 storing pure water supplies pure water to the electrolytic cell (as indicated by arrow B) under the control of the cascade control circuit constituted by the first control unit 302 and the second control unit 304. However, there is a large lag in concentration analysis, and the regulation system often fails to adequately perform the regulation due to the failure of the concentration meter.
Fig. 5 shows a schematic view of an apparatus for controlling pure water addition amount of an electrolytic cell system according to the present invention. In fig. 5, a broken line indicates a signal transmission path between the respective members, and a solid line indicates a liquid flow path between the respective members. In this apparatus, a first control unit 502 (which may be, for example, a differential indication controller, DICA) takes the cathode solution concentration as a master factor and controls the flow of the cathode solution from 512. Accordingly, the container 512 storing the cathode solution supplies a part of the cathode solution to the electrolytic bath and another part to the cathode solution tank (as indicated by arrow a) under the control of the first control unit 502. The output signal of the first control unit 502 is input to a second control unit 504 (for example, a flow rate indication controller, FICA) which outputs a pure water flow rate control signal as a secondary regulation parameter based on the signal. Furthermore, as shown in FIG. 5, the apparatus for controlling the pure water addition amount of the electrolytic cell system according to the present invention is a relatively complicated adjusting system. The improved pure water addition amount adjusting system is to introduce the compensation unit 514 on the regulator (e.g., composed of the first control unit 502 and the second control unit 504) of the cascade adjusting system. The compensation unit 514 calculates a functional relationship among the number of electrolytic cells, the rectification current, the compensation coefficient, and the pure water addition amount. The calculated value of the compensation unit 514 is used as the set value of the cascade regulator by the external set value function of the DCS control system, and the calculated value is used to control the flow rate of pure water flowing from 510 (for example, the flow rate of pure water flowing from 510 is controlled based on the operation of the valve 508 and the flowmeter 506) to supply pure water to the electrolytic cell (as indicated by arrow B), so that the pure water addition amount is always maintained at the optimum state.
FIG. 7 shows a flow chart of a method of controlling the pure water addition amount of an electrolytic cell system according to the present invention. The method starts at step 702 with selecting an electrolytic cell at step 704; in step 706, it is determined whether the electrolytic cell satisfies a start-up condition; in the event that a determination is made in step 706 that the start-up condition is met, the method proceeds to step 708, where the electrolyzer is switched to "automatic" mode in step 708; at step 710, the number NA, NB, NC, ND of cells is input in a compensation unit of an apparatus for controlling the pure water addition amount of an electrolytic cell system; at step 712, the cell current value KA A、KAB、KAC、KAD is input to the compensation unit according to the current acquired by the current sensor provided in the cell system; in step 714, a compensation system Kf is input into a compensation unit of the apparatus for controlling the pure water addition amount of the electrolytic cell system; in step 716, the compensation unit calculates a pure water addition flow Fcal; in step 718, the pure water addition flow Fcal is used as a set value of the pure water cascade regulator; at step 720, the electrolyzer is started; further, in the case where it is judged in step 706 that the start-up condition is not satisfied, the method proceeds to step 724, and in step 724, the operation of controlling the pure water addition amount of the electrolytic cell system is exited.
From the above proposal, the set value of the pure water addition amount is calculated according to the work load of the electrolytic cell, thereby stably controlling the concentration of the cathode solution and keeping the electrolytic cell in the optimal state all the time.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. An apparatus (40) for controlling an amount of pure water added to an electrolytic cell system (10), the electrolytic cell system (10) including a plurality of electrolytic cells (11) arranged in parallel, each electrolytic cell (11) including an anode chamber (11A), a cathode chamber (11B), an ion exchange membrane (12) separating the anode chamber (11A) and the cathode chamber (11B), an anode (13) provided in the anode chamber (11A), and a cathode (14) provided in the cathode chamber (11B), wherein pure water is injected into the cathode chamber (11A) of each electrolytic cell (11), characterized in that the apparatus (40) comprises:
A pure water adding module (404) for injecting pure water into the cathode chamber at a variable output flow rate;
A pure water addition amount control module (402) that calculates a set flow rate of pure water injected into the cathode chamber based on a current value of each electrolytic cell, the number of unit cells of the electrolytic cell system, and a compensation coefficient, and dynamically adjusts the output flow rate of the pure water addition module (404) based on the calculated set flow rate to control the concentration of a cathode solution in the cathode chamber.
2. The apparatus for controlling pure water addition amount of an electrolytic cell system according to claim 1, wherein the pure water addition amount control module (402) includes an information acquisition unit (402-4), a compensation unit (402-6), and an adjustment unit (402-8), the information acquisition unit (402-4) acquiring at least one of: the compensation unit (402-6) calculates a set flow rate of pure water injected into the cathode chamber based on the information acquired by the information acquisition unit (402-4) and a compensation coefficient, and the adjustment unit (402-8) dynamically adjusts the output flow rate of the pure water addition module (404) based on the calculated set flow rate and the flow rate of the cathode solution to control the concentration of the cathode solution in the cathode chamber.
3. The apparatus for controlling pure water addition amount of an electrolytic cell system according to claim 2, wherein the pure water addition amount control module (402) further comprises a display unit (402-2) that displays an output flow rate of the pure water addition module (404), the set flow rate, the compensation coefficient, and the number of unit cells of the electrolytic cell system, wherein the display unit is configured to receive an input or modification of the number of unit cells of the electrolytic cell system, and the compensation coefficient.
4. The apparatus for controlling pure water addition amount of an electrolytic cell system according to claim 2, wherein the information acquisition unit includes a current sensor.
5. The apparatus for controlling pure water addition amount of an electrolytic cell system according to claim 1, wherein the pure water addition module comprises:
A reservoir (404-2) for storing pure water;
a valve (404-4) connected to the reservoir (404-2) via a pipe, and the valve adjusts the output flow rate of the reservoir (404-2) under the control of the pure water addition control module; and
A flow sensor (404-6) provided on the pipe to detect an output flow rate of the reservoir (404-2), and the flow sensor sends the output flow rate of the reservoir (404-2) to the pure water addition amount control module.
6. The apparatus for controlling pure water addition amount of an electrolytic cell system according to claim 2, wherein the compensation unit (402-6) calculates a set flow rate of pure water injected into the cathode chamber based on the following formula:
Fcal＝Kf×0.00213×(NA×KAA+NB×KAB+NC×KAC+ND×KAD)
Wherein Fcal is the set flow rate of pure water injected into the cathode chamber calculated by the compensation unit;
kf is a compensation coefficient ranging from 0.5 to 1.5;
KA A is the current value of the first electrolytic cell; KA B is the current value of the second electrolytic cell;
KA C is the current value of the third electrolytic cell; KA D is the current value of the fourth electrolytic cell;
N A is the number of the unit cells of the first electrolytic cell;
N B is the number of the unit cells of the second electrolytic cell;
n C is the number of the unit cells of the third electrolytic cell;
N D is the number of the unit cells of the fourth electrolytic cell.
7. A method of controlling an amount of pure water added to an electrolytic cell system, the electrolytic cell system (10) including a plurality of electrolytic cells (11) arranged in parallel, each electrolytic cell (11) including an anode chamber (11A), a cathode chamber (11B), an ion exchange membrane (12) separating the anode chamber (11A) and the cathode chamber (11B), an anode (13) provided in the anode chamber (11A), and a cathode (14) provided in the cathode chamber (11B), wherein pure water is injected into the cathode chamber (11A) of each electrolytic cell unit (11), characterized by comprising:
A pure water adding step of injecting pure water into the cathode chamber at a variable output flow rate by a pure water adding module (404);
A pure water addition amount control step of calculating, by a pure water addition amount control module (402), a set flow rate of pure water to be injected into the cathode chamber based on a current value of each electrolytic cell, the number of unit cells of the electrolytic cell system, and a compensation coefficient, and dynamically adjusting the output flow rate of the pure water addition module (404) based on the calculated set flow rate to control the concentration of a cathode solution in the cathode chamber.
8. The method of controlling pure water addition amount of an electrolytic tank system according to claim 7, wherein the pure water addition amount control step comprises the substeps of: an information acquisition step, a compensation step, and an adjustment step, in which at least one of the following is acquired: the current value of each electrolytic cell, the number of unit cells of an electrolytic cell system, the flow rate of the cathode solution, a set flow rate of pure water injected into the cathode chamber is calculated based on the information acquired in the information acquisition step and a compensation coefficient in a compensation step, and the output flow rate of the pure water addition module (404) is dynamically adjusted based on the calculated set flow rate and the flow rate of the cathode solution in the adjustment step to control the concentration of the cathode solution in the cathode chamber.
9. The method of controlling a pure water addition amount of an electrolytic cell system according to claim 8, wherein the pure water addition amount control step further comprises a display step of displaying the output flow rate of the pure water addition module (404), the set flow rate of pure water, the compensation coefficient, and the number of cell units of the electrolytic cell system, wherein in the display step, an input or modification of the number of cell units of the electrolytic cell system, and the compensation coefficient is received.
10. The method of controlling pure water addition amount of an electrolytic cell system according to claim 8, wherein the compensating step calculates a set flow rate of pure water injected into the cathode chamber based on the following formula:
Fcal＝Kf×0.00213×(NA×KAA+NB×KAB+NC×KAC+ND×KAD)
Wherein Fcal is the set flow calculated by the compensation unit;
kf is a compensation coefficient ranging from 0.5 to 1.5;
KA A is the current value of the first electrolytic cell; KA B is the current value of the second electrolytic cell;
KA C is the current value of the third electrolytic cell; KA D is the current value of the fourth electrolytic cell;
N A is the number of the unit cells of the first electrolytic cell;
N B is the number of the unit cells of the second electrolytic cell;
n C is the number of the unit cells of the third electrolytic cell;
N D is the number of the unit cells of the fourth electrolytic cell.
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