CN115976572B - Method, system, device and storage medium for controlling gas purity of electrolytic cell - Google Patents
Method, system, device and storage medium for controlling gas purity of electrolytic cell Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000001257 hydrogen Substances 0.000 claims abstract description 253
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 253
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 229
- 239000001301 oxygen Substances 0.000 claims abstract description 201
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 201
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 198
- 239000007789 gas Substances 0.000 claims abstract description 70
- 230000008859 change Effects 0.000 claims abstract description 48
- 230000001105 regulatory effect Effects 0.000 claims description 142
- 239000007788 liquid Substances 0.000 claims description 77
- 230000004907 flux Effects 0.000 claims description 31
- 150000002431 hydrogen Chemical class 0.000 claims description 26
- 230000033228 biological regulation Effects 0.000 claims description 22
- 238000009792 diffusion process Methods 0.000 claims description 21
- 239000003792 electrolyte Substances 0.000 claims description 21
- 230000001276 controlling effect Effects 0.000 claims description 19
- 238000005868 electrolysis reaction Methods 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 238000009825 accumulation Methods 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 4
- 239000008151 electrolyte solution Substances 0.000 claims 1
- 230000015654 memory Effects 0.000 description 8
- 238000004146 energy storage Methods 0.000 description 6
- 239000003513 alkali Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004590 computer program Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The invention discloses a method, a system, a device and a storage medium for controlling the gas purity of an electrolytic tank, wherein the method comprises the steps of obtaining real-time pressure and pressure difference of a cathode side and an anode side of the electrolytic tank, then obtaining the change trend of the hydrogen content in oxygen in the electrolytic tank according to the pressure and pressure difference of the cathode side and the anode side, and adjusting the pressure of the cathode side and/or the anode side based on the change trend.
Description
Technical Field
The invention relates to the technical field of electrolyzed water, in particular to a method, a system, a device and a storage medium for controlling the purity of gas in an electrolytic tank.
Background
The hydrogen energy storage is used as an emerging energy storage mode of the power system, and compared with the traditional energy storage, the novel energy storage system has the advantages of cleanness, greenness, high energy density, large storage capacity, long service life, convenience in storage and transmission and the like. Therefore, the comprehensive development and utilization of the coupled hydrogen energy storage are one of the preferred schemes for the efficient operation of wind power and photovoltaic.
However, renewable energy sources such as wind energy and solar energy have the characteristics of randomness, volatility, uncertainty and the like, and when the load is low, the generation rate of oxygen is lower than the crossing rate of hydrogen, so that the hydrogen content in the oxygen is increased. The international standard for hydrogen production by water electrolysis specifies that the maximum hydrogen content in oxygen is 2% and when the oxygen content exceeds 2%, the system needs to be forced to stop operating, so that the hydrogen content in oxygen is a main limiting factor for the working load range of the electrolytic cell.
Hydrogen in oxygen is the result of the crossover of hydrogen gas through the membrane, and depends on many factors including membrane characteristics (porosity, tortuosity and thickness), operating pressure and temperature, split or mixed electrolyte circulation mode, current density, and the like. In the prior art, the sensor is used for monitoring the hydrogen content in oxygen, the regulation of the gas purity is hysteresis, the response time is long, and the hydrogen content in oxygen in an electrolytic tank possibly exceeds a safety range to cause the shutdown of equipment.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method, a system, a device and a storage medium for controlling the gas purity of an electrolytic tank, which are used for solving the technical problems that the existing control method has hysteresis and cannot respond in time, so that the hydrogen content in oxygen in the electrolytic tank possibly exceeds a safety range to cause the shutdown of equipment.
The technical scheme provided by the invention is as follows:
the first aspect of the embodiment of the invention provides a method for controlling the purity of gas in an electrolytic cell, which comprises the following steps: acquiring the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell; acquiring the variation trend of the hydrogen content in the oxygen in the electrolytic tank according to the pressure and the pressure difference of the cathode side and the anode side; and adjusting the pressure of the cathode side and/or the anode side based on the change trend.
Optionally, adjusting the pressure of the cathode side and/or the anode side based on the trend of change includes: judging whether the hydrogen content in the oxygen keeps continuously increasing and exceeds a first set value or not based on the change trend; if the pressure keeps continuously increasing and exceeds the first set value, calculating the adjusting parameters of the cathode side and the anode side, and adjusting the pressure of the cathode side and/or the anode side according to the adjusting parameters; if the continuous increase is not maintained or the first set point is not exceeded, the pressure on the cathode side and/or the anode side is not regulated.
Optionally, adjusting the pressure of the cathode side and/or the anode side according to the adjustment parameter comprises: judging whether the liquid level of the gas-liquid separator after adjustment exceeds a preset upper limit and a preset lower limit according to the adjustment parameters; if the pressure of the cathode side or the anode side is not higher than the preset upper limit and lower limit, regulating the pressure of the anode side or the cathode side according to the regulating parameter so that the pressure of the anode side is higher than the pressure of the cathode side; if the preset upper and lower limits are exceeded, the pressures on the cathode side and the anode side are simultaneously reduced.
Optionally, after adjusting the pressure of the cathode side and/or the anode side according to the adjustment parameter, further comprising: predicting whether the hydrogen content in the oxygen is lower than a second set value according to the regulated pressure and pressure difference of the cathode side and the anode side; and if the pressure is lower than the second set value, respectively restoring the pressure on the cathode side and the pressure on the anode side to the pressure before adjustment.
Optionally, the adjusting parameters include adjusting a differential pressure and an adjusting time, and the calculating adjusting parameters of the cathode side and the anode side includes: acquiring the regulating pressure difference and the regulating time according to the relation among the pressure and the pressure difference of the cathode side and the anode side, the liquid level of the gas-liquid separator and the hydrogen content in oxygen under the preset working condition; the manner of adjusting the pressure of the cathode side and/or the anode side according to the adjustment parameters is: based on the regulation parameters, the pressure of the cathode side and/or the anode side of the electrolytic cell is regulated by a first pressure regulating valve and a second pressure regulating valve provided at the cathode side outlet and the anode side outlet, respectively.
Optionally, the method for obtaining the change trend of the hydrogen content in the oxygen in the electrolytic tank according to the pressure difference between the cathode side and the anode side comprises the following steps: inputting the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell into a preset oxygen hydrogen content prediction model; and acquiring the variation trend of the hydrogen content in the oxygen through the preset oxygen hydrogen content prediction model.
Optionally, the process of constructing the predictive model of the hydrogen content in the preset oxygen of the hydrogen in oxygen comprises the following steps: constructing an initial oxygen hydrogen content prediction model according to the gas mixed flux, the hydrogen diffusion flux and the hydrogen pair flow of the hydrogen dissolved in the electrolyte; and constructing a preset oxygen hydrogen content prediction model according to the oxygen hydrogen dynamic impurity accumulation process and the initial oxygen hydrogen content prediction model.
Optionally, before constructing the initial oxygen hydrogen content prediction model according to the gas mixed flux, the hydrogen diffusion flux and the hydrogen versus flow of the hydrogen dissolved in the electrolyte, the method further comprises: acquiring a gas mixing flux according to the concentration of hydrogen on the cathode side and the flow rate of the electrolyte; obtaining hydrogen diffusion flux according to the effective diffusion coefficient of hydrogen permeating the membrane, the thickness of the membrane and the concentration difference of hydrogen; the hydrogen to flow rate is obtained according to the pressure difference between the cathode side and the anode side, the permeability of the diaphragm, the dynamic viscosity of the electrolyte, the solubility of hydrogen in the catholyte, the pressure of the cathode side and the thickness of the diaphragm.
Optionally, the pressure of the cathode side and/or the anode side is regulated by regulating the flow rate of gas release of the cathode side and/or the anode side by means of a first pressure regulating valve and a second pressure regulating valve arranged at the cathode side outlet and the anode side outlet of the electrolytic cell, respectively.
According to a second aspect of the embodiment of the invention, there is provided an electrolytic cell gas purity control system, comprising a controller, a differential pressure transmitter, a first pressure regulating valve, a second pressure regulating valve, a cathode pressure gauge and an anode pressure gauge, wherein the differential pressure transmitter, the first pressure regulating valve, the second pressure regulating valve, the cathode pressure gauge and the anode pressure gauge are all connected with the controller, the first pressure regulating valve and the second pressure regulating valve are respectively arranged at an anode side outlet and a cathode side outlet of the electrolytic cell, the cathode pressure gauge and the anode pressure gauge are respectively arranged at an anode side and a cathode side of the electrolytic cell, the first pressure regulating valve is used for regulating an anode side pressure, the second pressure regulating valve is used for regulating a cathode side pressure, the cathode pressure gauge is used for collecting a pressure on the cathode side of a collector and the anode side of the electrolytic cell, the differential pressure transmitter is used for collecting a pressure difference on the cathode side and the anode side of the electrolytic cell, the controller is used for receiving the differential pressure collected by the differential pressure transmitter, the pressure on the cathode side of the cathode pressure gauge collected by the cathode pressure gauge and the anode side pressure and the pressure on the anode side of the electrolytic cell or the pressure and the pressure/anode side pressure is regulated according to changes in the pressure trend or the pressure and/or the pressure on the anode side and/or the pressure change in the anode side and/or the pressure regulating valve is changed.
A third aspect of the embodiments of the present invention provides an apparatus for controlling purity of gas in an electrolytic cell, including: an acquisition module for acquiring the pressure and pressure difference of the cathode side and the anode side of the electrolytic cell; the prediction module is used for obtaining the change trend of the hydrogen content in the oxygen in the electrolytic cell according to the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell; and the adjusting module is used for adjusting the pressure of the cathode side and/or the anode side based on the change trend.
A fourth aspect of the embodiment of the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the method for controlling the purity of the gas of the electrolytic cell according to any one of the first aspect of the embodiment of the present invention.
From the above technical solutions, the embodiment of the present invention has the following advantages:
according to the method, the system, the device and the storage medium for controlling the gas purity of the electrolytic tank, provided by the embodiment of the invention, the pressure and the pressure difference of the cathode side and the anode side of the electrolytic tank are obtained, then the change trend of the hydrogen content in the oxygen in the electrolytic tank is obtained according to the pressure and the pressure difference of the cathode side and the anode side, the pressure of the cathode side and/or the pressure of the anode side is regulated based on the change trend, and the hydrogen content in the oxygen in the electrolytic tank can be predicted through the change trend of the hydrogen content in the oxygen, so that the pressure of the cathode side and/or the anode side is regulated in time to reduce the hydrogen content in the oxygen, and frequent shutdown of equipment caused by the fact that the hydrogen content in the oxygen in the electrolytic tank exceeds a safety range is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling the purity of a gas in an electrolytic cell according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for controlling the purity of a gas in an electrolytic cell according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a system for controlling the purity of a gas in an electrolytic cell according to an embodiment of the present invention;
FIG. 4 is a block diagram of a gas purity control apparatus for an electrolytic cell in accordance with an embodiment of the present invention;
fig. 5 is a schematic diagram of a computer-readable storage medium according to an embodiment of the present invention.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a method for controlling the purity of gas in an electrolytic cell, which is shown in fig. 1 and 2 and comprises the following steps:
step S100: the pressure and pressure difference on the cathode side and the anode side of the cell are obtained. The electrolytic tank is a device for generating electrolysis, hydrogen is generated on the cathode side of the electrolytic tank, oxygen is generated on the anode side of the electrolytic tank, and electrolyte in the electrolytic tank is alkali liquor. The pressure and pressure difference of the cathode side and the anode side are obtained by arranging a differential pressure transmitter, a cathode pressure gauge and an anode pressure gauge on the electrolytic cell.
Step S200: and acquiring the variation trend of the hydrogen content in the oxygen in the electrolytic cell according to the pressure and the pressure difference of the cathode side and the anode side. The hydrogen content in the oxygen in the electrolytic tank is mainly influenced by the pressure and the pressure difference of the cathode side and the anode side and the liquid level of the gas-liquid separator, and the liquid level of the gas-liquid separator correspondingly changes when the pressure of the cathode side and the anode side is regulated, so that the change trend of the hydrogen content in the oxygen in the electrolytic tank can be predicted through the pressure and the pressure difference of the cathode side and the anode side.
Step S300: the pressure on the cathode side and/or the anode side is adjusted based on the trend of change. Specifically, the variation range of the hydrogen content in the oxygen can be obtained by changing the trend energy, so that whether the hydrogen content in the oxygen continuously increases under the current pressure difference or not is known, and the maximum hydrogen content threshold value in the oxygen specified by the international water electrolysis hydrogen production standard is exceeded, and if the threshold value is exceeded, the operation of the electrolytic tank is stopped. Therefore, by predicting the change of the hydrogen content in the oxygen through the change trend of the hydrogen content in the oxygen in the electrolytic tank, different pressure regulation strategies can be adopted in advance, such as increasing the pressure of the anode side or reducing the pressure of the cathode side, so that the anode side pressure is higher than the cathode side pressure, or simultaneously reducing the pressure of the anode side and the pressure of the cathode side, so as to avoid the condition that the hydrogen content in the oxygen exceeds a set threshold value and is stopped.
According to the method for controlling the gas purity of the electrolytic tank, provided by the embodiment of the invention, the pressure and the pressure difference of the cathode side and the anode side of the electrolytic tank are obtained, then the change trend of the hydrogen content in the oxygen in the electrolytic tank is obtained according to the pressure and the pressure difference of the cathode side and the anode side, the pressure of the cathode side and/or the anode side is adjusted based on the change trend, and the hydrogen content in the oxygen in the electrolytic tank can be predicted through the change trend of the hydrogen content in the oxygen, so that the pressure of the cathode side and/or the anode side is adjusted in time to reduce the hydrogen content in the oxygen, and frequent shutdown of equipment caused by the fact that the hydrogen content in the oxygen in the electrolytic tank exceeds a safety range is avoided.
In one embodiment, the step S200 is to obtain the trend of the hydrogen content in the oxygen in the electrolytic cell according to the pressure difference between the cathode side and the anode side, and specifically includes:
step S210: inputting the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell into a preset oxygen hydrogen content prediction model;
step S200: and obtaining the variation trend of the hydrogen content in the oxygen through a preset oxygen hydrogen content prediction model.
The preset model for predicting the hydrogen content in the oxygen is a model which is pre-constructed according to the pressure and the pressure difference between the cathode side and the anode side of the electrolytic tank, the liquid level of the gas-liquid separator, the alkali liquid flow rate, the alkali liquid temperature and the current density and is used for predicting the hydrogen content in the oxygen according to the pressure difference between the cathode side and the anode side, and the actual hydrogen content in the oxygen in the electrolytic tank can be obtained in advance through the model, so that the change trend of the hydrogen content in the oxygen is obtained, and the hydrogen content in the oxygen is predicted.
In one embodiment, the process of constructing a predictive model of the hydrogen content of a predetermined set of hydrogen-in-oxygen values comprises: constructing an initial oxygen hydrogen content prediction model according to the gas mixed flux, the hydrogen diffusion flux and the hydrogen pair flow of the hydrogen dissolved in the electrolyte; and constructing a preset oxygen hydrogen content prediction model according to the oxygen hydrogen dynamic impurity accumulation process and the initial oxygen hydrogen content prediction model.
The hydrogen in oxygen in the electrolysis process comes mainly from three aspects: gas mixing in a mixed alkali liquor circulation mode, cross-membrane gas convection caused by pressure difference and cross-membrane gas diffusion caused by concentration difference. According to the embodiment of the invention, under the mixed electrolyte circulation mode, the mixed electrolyte at the inlets of the cathode and the anode is mixed to cause the mutual mixing of the dissolved hydrogen and oxygen in the solution, so that the generated gas mixing flux is considered; hydrogen diffusion flux caused by the difference in dissolved hydrogen concentration at the cathode side and the anode side; the hydrogen content prediction model in the initial oxygen is constructed based on the gas mixing flux, the hydrogen diffusion flux and the hydrogen relative flow due to the pressure difference between the cathode side and the anode side, so that the reason of the hydrogen content change in the oxygen can be comprehensively reflected.
In addition, the gas exhausted from the electrolytic tank is subjected to gas-liquid separation and purification treatment, a dynamic impurity accumulation process of hydrogen in oxygen exists at the stage, the influence of the process is considered, a preset oxygen hydrogen content prediction model is built according to the dynamic impurity accumulation process of hydrogen in oxygen and an initial oxygen hydrogen content prediction model, and the change trend of the hydrogen content in oxygen under different working conditions can be predicted.
In one embodiment, before constructing the initial oxygen hydrogen content prediction model according to the gas mixture flux, the hydrogen diffusion flux and the hydrogen versus flow of the hydrogen dissolved in the electrolyte, the method further comprises:
the gas mixture flux was obtained according to the concentration of hydrogen gas on the cathode side and the flow rate of the electrolyte.
Specifically, in the mixed electrolyte circulation mode, the electrolyte at the inlets of the cathode and the anode is mixed to cause the hydrogen and the oxygen dissolved in the solution to be mixed with each other, and the gas mixing flux is calculated in the following mode:
wherein,,representing the gas mixing flux; />Represents the concentration of hydrogen at the cathode side; v (V) lye Indicating the flow rate of the electrolyte; />Represents the solubility of hydrogen in KOH solution; />Representing the cathode side pressure.
And obtaining the hydrogen diffusion flux according to the effective diffusion coefficient of hydrogen permeating the membrane, the thickness of the membrane and the concentration difference of the hydrogen.
In particular, the hydrogen diffusion flux due to the difference in dissolved hydrogen concentration at the cathode side and the anode sideThe expression is as follows:
wherein delta m Represents the thickness of the separator;indicating the effective diffusion coefficient of hydrogen through the membrane;
indicating the solubility of hydrogen in the catholyte; />Indicating the difference in concentration of hydrogen.
The hydrogen to flow rate is obtained according to the pressure difference between the cathode side and the anode side, the permeability of the diaphragm, the dynamic viscosity of the electrolyte, the solubility of hydrogen in the catholyte, the pressure of the cathode side and the thickness of the diaphragm.
In particular, hydrogen gas flows due to the pressure difference between the cathode and anodeThe expression is as follows:
wherein Δp represents the pressure difference between the cathode and the anode; k (K) sep Represents the permeability of the membrane; η (eta) L The dynamic viscosity of the solution is indicated.
The initial oxygen hydrogen content prediction model constructed based on the gas mixture flux, the hydrogen diffusion flux and the hydrogen vs. flow is expressed as follows:
wherein,,indicating the rate of oxygen generation; a is that sep Representing the area of the diaphragm. The gas discharged from the electrolytic tank is subjected to gas-liquid separation and purification treatment, and during this stage there is a dynamic impurity accumulation process of hydrogen in oxygen, and the influence of this process is taken into consideration, based on the dynamic impurity accumulation process of hydrogen in oxygen and the initial oxygen hydrogen content prediction model HTO 0 Constructing a predictive model HTO of hydrogen content in preset oxygen 1 The expression is as follows:
wherein τ j The separation time of oxygen passing through a gas-liquid separator, a scrubber and the like in the purification process is shown. HTO by presetting hydrogen content prediction model in oxygen 1 The change trend of the hydrogen content in oxygen under different working conditions can be predicted by utilizing the real-time pressure difference in the electrolytic tank.
The following describes a process of predicting a trend of the hydrogen content in oxygen under different working conditions by a preset hydrogen content prediction model in oxygen in combination with a specific scene:
The prediction of the hydrogen content in oxygen based on the preset oxygen content prediction model comprises the following steps:
1. and (3) data acquisition: FIG. 3 is a schematic diagram of a system for controlling purity of an electrolytic cell, the system comprising an electrolytic cell, a pressure regulating valve, a cathode pressure gauge, an anode pressure gauge, a temperature transmitter, a flow meter, a base-liquid pump, a differential pressure transmitter, an editable controller, a sensor for oxygen in hydrogen, a gas-liquid separator on the hydrogen side and the oxygen side, a liquid level transmitter, and the like, according to an embodiment of the present invention. The data required to be collected for constructing the predictive model of the hydrogen content in the preset oxygen mainly comprises the following steps: electrolyte flow collected by a flowmeter, pressure on a cathode side collected by a cathode pressure meter, pressure on an anode side collected by an anode pressure meter, pressure difference collected by a differential pressure transmitter, cathode liquid level and anode liquid level collected by a liquid level transmitter, temperature collected by a temperature transmitter and content of hydrogen in oxygen collected by an oxygen sensor in hydrogen. When the pressure difference inside the electrolytic tank is measured, the positions of the cathode pressure gauge and the anode pressure gauge are close to the alkaline liquid outlet of the electrolytic tank as much as possible in order to ensure that accurate pressure data under different working conditions are acquired due to the compressibility of gas and liquid and the hysteresis of pressure change transmission.
2. Parameter calibration is carried out on a preset oxygen hydrogen content prediction model based on data collected by a cathode pressure gauge, an anode pressure gauge and a differential pressure transmitter: experimental data were obtained under two different conditions: (1) Under different pressures and current densities, the pressure and pressure difference, the liquid level and the hydrogen content in oxygen are not provided with a pressure regulating valve; (2) Under constant current density, a pressure regulating valve is additionally arranged and regulated, and the pressure and pressure difference in the electrolytic tank and the hydrogen content in oxygen under different liquid levels are measured. Based on the data under the working conditions, the change correspondence rule between the cathode-anode pressure and the pressure difference of the electrolytic tank, the liquid level of the cathode-anode gas-liquid separator and the hydrogen content in oxygen can be obtained, a basis is provided for determining the regulating pressure and the pressure difference and regulating time when the hydrogen content in oxygen is regulated, and the regulating pressure and the pressure difference are regulated through the opening degrees of the first pressure regulating valve and the second pressure regulating valve, so that the opening degrees of the first pressure regulating valve and the second pressure regulating valve can be determined based on the regulating pressure and the pressure difference.
3. And (3) verifying the prediction accuracy of the calibrated model: based on the well-operated electrolyzer, the consistency of the actually measured electrolyzer pressure and pressure difference, the hydrogen content in oxygen and the model prediction result is verified through the input of given working conditions.
4. In the actual working process, real-time pressure data are measured through the cathode pressure gauge, the anode pressure gauge and the differential pressure transmitter, summarized to the editable controller and transmitted to a preset oxygen hydrogen content prediction model as real-time parameters, and the opening of the pressure regulating valve is controlled according to the predicted value of the preset oxygen hydrogen content prediction model, so that the trend of the oxygen hydrogen content is changed, and the continuous operation of the system is ensured.
In an embodiment, the step S300 adjusts the pressure on the cathode side and/or the anode side based on the trend of change, including:
step S310: judging whether the hydrogen content in the oxygen keeps continuously increasing and exceeds a first set value based on the change trend;
step S320: if the pressure keeps continuously increasing and exceeds the first set value, calculating the adjusting parameters of the cathode side and the anode side, and adjusting the pressure of the cathode side and/or the anode side according to the adjusting parameters;
step S330: if the continuous increase is not maintained or the first set point is not exceeded, the pressure on the cathode side and/or the anode side is not adjusted.
Specifically, the first set value is set according to the actual working condition, and the size of the first set value is smaller than or equal to 2% of the highest content threshold value of hydrogen in oxygen specified by the international water electrolysis hydrogen production standard, namely the first set value is smaller than or equal to 2%. Illustratively, the first set point is 2%. If the hydrogen content in the oxygen is judged to be continuously increased and exceeds the first set value according to the change trend, the fact that the hydrogen content in the oxygen is too high is indicated to be possibly caused according to the current pressure and the pressure difference operation, therefore, the pressure of the cathode side and/or the anode side needs to be regulated to reduce the hydrogen content in the oxygen, the condition that electrolysis is stopped due to the too high hydrogen content in the oxygen is avoided, and if the predicted hydrogen content in the oxygen does not exceed the first set value, the fact that the too high hydrogen content in the oxygen is not caused under the current pressure and the pressure difference operation is indicated, and the current pressure difference operation can be continuously maintained. According to the embodiment of the invention, the hydrogen content in the oxygen is lower than the first set value by regulating the cathode pressure and the anode pressure, so that the condition of overhigh hydrogen content in the oxygen is avoided.
In an embodiment, the pressure on the cathode side and/or the anode side is regulated by means of a first pressure regulating valve and a second pressure regulating valve arranged at the cathode side outlet and the anode side outlet, respectively, of the electrolytic cell, the flow rate of the gas release on the cathode side and/or the anode side being regulated.
In particular, when the electrolyzer is combined with a variable energy source to produce hydrogen electrolytically, the electrolyzer is coupled with the renewable energy source directly or coupled with a plurality of renewable energy sources, a power grid and an energy storage device. The randomness, fluctuation and uncertainty of the variable energy source can lead to fluctuation of the hydrogen content in the oxygen in the electrolytic cell, and the fluctuation of the hydrogen content in the oxygen can be restrained by adjusting the pressure and the pressure difference of the cathode side and the anode side. Based on the way of generating hydrogen in oxygen, the influence of the pressure force and the pressure difference of the cathode and the anode on the hydrogen in oxygen is different, wherein the regulation capability of the pressure change on the hydrogen content in oxygen is larger than the pressure difference, the pressure and the pressure difference change of the traditional electrolysis system are realized by regulating the liquid level difference of the gas-liquid separator through a hydrogen/oxygen regulating valve, the adjustable range and the response speed are limited, and the embodiment of the invention can realize the rapid regulation and control of the pressure and the pressure difference by regulating the flow rate of gas release on the cathode side and/or the anode side, and reducing the pressure by increasing the flow rate of gas release or reducing the flow rate of gas release to increase the pressure. Specifically, through setting up the velocity of flow that first pressure regulating valve and second pressure regulating valve adjusted the gas release of cathode side and/or positive pole side in electrolysis trough negative pole export, the liquid level variable range of gas-liquid separator widens through setting up of first pressure regulating valve and second pressure regulating valve, can adjust electrolysis trough internal pressure and both sides pressure differential in the short time, can realize the quick regulation and control to pressure according to the prediction result of the hydrogen content prediction model in the preset oxygen to improve gas purity.
In one embodiment, the tuning parameters include tuning differential pressure and tuning time, and calculating tuning parameters for the cathode side and the anode side includes: acquiring a regulating pressure difference and a regulating time according to the pre-acquired relation between the pressure and the pressure difference of the cathode side and the anode side under a set working condition and the liquid level of the cathode-anode gas-liquid separator and the hydrogen content in oxygen; the manner of adjusting the pressure of the cathode side and/or the anode side according to the adjustment parameters is: based on the regulation parameters, the pressure of the cathode side and/or the anode side of the electrolytic cell is regulated by a first pressure regulating valve and a second pressure regulating valve provided at the cathode side outlet and the anode side outlet, respectively. The adjustment pressure difference Δp=1000pa, which represents the value of the anode side pressure minus the cathode side pressure, is generally taken, and the adjustment is performed by changing the flow rate of the gas release during the adjustment time by the first pressure adjustment valve and the second pressure adjustment valve. The regulating pressure difference and the regulating time are set based on the relation between the pressure and the pressure difference of the cathode side and the anode side under the set working condition and the liquid level of the cathode-anode gas-liquid separator and the hydrogen content in oxygen, and the higher the hydrogen content in oxygen under the current pressure difference is, the larger the regulating pressure difference is, and the longer the regulating time is. Illustratively, the pressure differential and the adjustment time are increased in a gradient when the hydrogen content in oxygen at the current pressure differential is greater than the set adjustment threshold, and the adjustment time t=20 mm is adjusted when the hydrogen content in oxygen at the current pressure differential is less than the set adjustment threshold.
In an embodiment, adjusting the pressure on the cathode side and/or the anode side according to the adjustment parameter comprises: judging whether the liquid level of the gas-liquid separator after adjustment exceeds a preset upper limit and a preset lower limit according to the adjustment parameters; if the pressure of the cathode side or the anode side is not higher than the preset upper limit and lower limit, regulating the pressure of the anode side or the cathode side according to the regulating parameter so that the pressure of the anode side is higher than the pressure of the cathode side; if the preset upper and lower limits are exceeded, the pressures on the cathode side and the anode side are simultaneously reduced.
Specifically, the preset upper and lower limits are safety liquid level thresholds required by the gas-liquid separator, according to the relation between pressure and pressure difference under set working conditions, the liquid level of the cathode-anode gas-liquid separator and the hydrogen content in oxygen, the liquid level corresponding to the pressure difference in the regulating parameters is obtained, if the liquid level does not exceed the preset upper and lower limits, the pressure of the anode side and the cathode side can be regulated according to the regulating pressure difference, the pressure of the anode side and the pressure of the cathode side can be regulated according to a first-level regulating mode, namely the pressure of the anode side and the pressure of the cathode side can be regulated according to the regulating pressure difference if the liquid level exceeds the preset upper and lower limits, the pressure of the anode side and the pressure of the cathode side can be regulated according to the regulating pressure difference, so that the two-level regulating mode is selected, the pressure of the cathode side and the anode side can be reduced, and the hydrogen content in oxygen can be regulated quickly at the moment because the regulating capacity of the pressure change on the hydrogen content in oxygen is larger than the pressure difference.
According to the embodiment of the invention, the hydrogen content in oxygen is regulated through two different pressure regulation strategies, so that the method is suitable for different power supply side fluctuation, the load range of an electrolysis system is widened, the hydrogen content in oxygen is prevented from exceeding a set threshold value, the regulation range can be enlarged, and the regulation mode is flexible.
In an embodiment, after adjusting the pressure on the cathode side and/or the anode side according to the adjustment parameter, the method further comprises: predicting whether the hydrogen content in oxygen is lower than a second set value according to the pressure and the pressure difference of the cathode side and the anode side after adjustment; if the pressure is lower than the second set value, the pressure on the cathode side and the pressure on the anode side are respectively restored to the pressure before adjustment.
Specifically, the second set value is smaller than or equal to the first set value, when the predicted hydrogen content in oxygen is lower than the second set value, the pressures of the original cathode side and the anode side are restored, and when the predicted hydrogen content in oxygen is greater than the second set value, the pressures of the cathode side and/or the anode side are continuously adjusted until the predicted hydrogen content in oxygen reaches a safe range. The embodiment of the invention can keep the hydrogen content in the oxygen in a safe range in the electrolysis process, and restore the pressure of the original cathode side and the anode side, thereby having less influence on the electrolysis efficiency.
The pressure regulation process is described below with one complete example.
As shown in fig. 2, the data of the pressure and pressure difference inside the electrolytic cell are collected in real time and transmitted to the editable controller for processing, the predicted hydrogen content in oxygen is predicted by the established predicted model for predicting the hydrogen content in preset oxygen, if the predicted hydrogen content in oxygen is continuously growing and has a trend of reaching the first set value, the editable controller calculates the pressure difference deltap between the cathode side and the anode side required for regulation, the pressure difference can lead to the change of the liquid level of the gas-liquid separator (for ensuring safety, the liquid level difference deltah is usually limited max Because of the arrangement of the first pressure regulating valve and the second pressure regulating valve of the oxyhydrogen outlet of the electrolytic tank, the pressure inside the electrolytic tank can be ensured to be stable under the condition of larger liquid level difference, so that the electrolyzer is not limited by the liquid level difference any more, and only the liquid level of the gas-liquid separator is required to be between the upper limit and the lower limit.
If the liquid level corresponding to the pressure difference is within the safety range, performing primary regulation: the opening delta X of the first pressure regulating valve and the second pressure regulating valve at the outlet of the electrolytic tank is changed, the gas flow rates at two sides are regulated to ensure that the anode side pressure is higher than the cathode side pressure (generally taking delta P=1000pa), specifically, the opening delta X of the first pressure regulating valve at the anode side can be reduced, so that the anode side pressure is increased, or the opening delta X of the second pressure regulating valve at the cathode side is increased, so that the cathode side pressure is reduced, the hydrogen transmembrane convection caused by pressure difference is reduced, the continuous increase of the hydrogen content in oxygen is restrained, and the system can be ensured to continuously work.
If the fluctuation amplitude and frequency of the power supply are larger, when the liquid level corresponding to the pressure difference deltaP required by calculation exceeds the preset upper and lower limits required by the gas-liquid separator, performing secondary regulation: simultaneously, the opening delta X of the first pressure regulating valve and the second pressure regulating valve at the cathode side and the anode side are regulated, and the gas flow at the two sides is regulated, so that the internal pressure of the electrolytic tank at the two sides of hydrogen and oxygen is reduced simultaneously, and the hydrogen in oxygen caused by three parts of liquid mixing, cross-membrane gas convection and diffusion is inhibited, so that the hydrogen content in oxygen can be reduced rapidly, and the phenomenon that the hydrogen content in oxygen exceeds a first set value due to severe fluctuation of a power supply is avoided.
According to the embodiment of the invention, the hydrogen content in the oxygen in the electrolytic tank is predicted in advance by the preset hydrogen content prediction model, so that the gas purity can be regulated in advance, and the stop of an electrolytic system is avoided; the method has the advantages that the method does not cause excessive negative influence on the electrolytic tank based on the regulation mode of the pressure on the hydrogen content in the oxygen, the stability of the system is ensured to a great extent, and the inhibition effect of the regulation pressure on the hydrogen in the oxygen is higher than that of the regulation of the flow rate reduction; in order to adapt to different power supply side fluctuation, the hydrogen content in oxygen is regulated by two different pressure regulation strategies, so that the load range of an electrolysis system is widened; the arrangement of the first pressure regulating valve and the second pressure regulating valve widens the liquid level variable range of the gas-liquid separator, can regulate the pressure in the electrolytic tank and the pressure difference at two sides in a short time, and can realize rapid regulation and control of the pressure according to the prediction result of the prediction model of the hydrogen content in preset oxygen, thereby improving the gas purity.
The embodiment of the invention also provides a gas purity control system of the electrolytic tank, which comprises a controller, a differential pressure transmitter, a first pressure regulating valve, a second pressure regulating valve, a cathode pressure gauge and an anode pressure gauge, wherein the differential pressure transmitter, the first pressure regulating valve, the second pressure regulating valve, the cathode pressure gauge and the anode pressure gauge are all connected with the controller, the first pressure regulating valve and the second pressure regulating valve are respectively arranged at an anode side outlet and a cathode side outlet of the electrolytic tank, the cathode pressure gauge and the anode pressure gauge are respectively arranged at an anode side and a cathode side of the electrolytic tank, the first pressure regulating valve is used for regulating the anode side pressure, the second pressure regulating valve is used for regulating the cathode side pressure, the cathode pressure gauge is used for collecting the pressure of the cathode side of the electrolytic tank, the anode pressure gauge is used for collecting the pressure of the anode side of the electrolytic tank, the differential pressure transmitter is used for collecting the differential pressure of the cathode side and the anode side of the electrolytic tank, the controller is used for receiving the differential pressure collected by the differential pressure transmitter, the pressure of the cathode side and the pressure of the anode side collected by the anode pressure gauge, the change trend of the hydrogen content in oxygen in the electrolytic tank is obtained according to the pressure of the cathode side and the anode side of the electrolytic tank and the differential pressure, and the first pressure regulating valve and/or the second pressure regulating valve are controlled based on the change trend to regulate the pressure of the cathode side and/or the anode side.
The gas purity control system of the electrolytic tank further comprises an oxygen-in-oxygen hydrogen sensor and an oxygen regulating valve which are arranged at an oxygen side gas outlet, a hydrogen regulating valve which is arranged at a hydrogen side gas outlet, an oxygen side gas-liquid separator, a liquid level transmitter, a scrubber, a cooler and a gas-water separator are further arranged on an oxygen side pipeline of the electrolytic tank, the oxygen side pipeline is correspondingly provided with the gas-liquid separator, the liquid level transmitter, the scrubber, the cooler and the gas-water separator, and the oxygen side liquid level transmitter and the hydrogen side liquid level transmitter are respectively used for collecting the liquid levels of the gas-liquid separator on the oxygen side and the hydrogen side.
Specifically, the controller is an editable controller, and in other embodiments, the controller may be a central processing unit (Central Processing Unit, CPU), a Digital signal processor (Digital SignalProcessor, DSP), an application specific integrated circuit (Application Specific IntegratedCircuit, ASIC), a Field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or a combination of the foregoing types of chips.
According to the gas purity control system for the electrolytic tank, disclosed by the embodiment of the invention, the fault tolerance of the electrolytic tank when being coupled with a variable energy source is improved based on a change trend prediction and pressure regulation strategy, the hydrogen content in oxygen is predicted in advance and is correspondingly controlled, the gas purity is improved, the frequent forced shutdown of the system is avoided, and the working load range of the electrolytic tank is widened. The pressure regulating valve is arranged to widen the liquid level variable range of the gas-liquid separator, so that the pressure in the electrolytic tank and the pressure difference at two sides can be regulated in a short time, and the pressure can be quickly regulated and controlled according to the model prediction result, thereby improving the gas purity.
The embodiment of the invention also provides a device for controlling the purity of the gas in the electrolytic tank, as shown in fig. 4, comprising:
an acquisition module 401 for acquiring the pressure and pressure difference of the cathode side and the anode side of the electrolytic cell; the specific content refers to the corresponding parts of the above method embodiments, and will not be described herein.
A prediction module 402, configured to obtain a trend of variation of the hydrogen content in oxygen in the electrolytic cell according to the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell; the specific content refers to the corresponding parts of the above method embodiments, and will not be described herein.
An adjustment module 403 for adjusting the pressure on the cathode side and/or the anode side based on the trend of change. The specific content refers to the corresponding parts of the above method embodiments, and will not be described herein.
According to the gas purity control device for the electrolytic tank, provided by the embodiment of the invention, the pressure and the pressure difference of the cathode side and the anode side of the electrolytic tank are obtained, then the change trend of the hydrogen content in the oxygen in the electrolytic tank is obtained according to the pressure and the pressure difference of the cathode side and the anode side, the pressure of the cathode side and/or the anode side is adjusted based on the change trend, and the hydrogen content in the oxygen in the electrolytic tank can be predicted through the change trend of the hydrogen content in the oxygen, so that the pressure of the cathode side and/or the anode side is adjusted in time to reduce the hydrogen content in the oxygen, frequent shutdown of equipment caused by the fact that the hydrogen content in the oxygen in the electrolytic tank exceeds a safety range is avoided, and the regulation capacity and response speed of the system to the hydrogen content in the oxygen are improved.
The embodiment of the present invention also provides a computer readable storage medium having stored thereon a computer program 13 which, when executed by a processor, implements the steps of the method for controlling the purity of a cell gas of the above embodiment, as shown in fig. 5. The storage medium also stores audio and video stream data, characteristic frame data, interactive request signaling, encrypted data, preset data size and the like. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random access Memory (Random AccessMemory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above. Those skilled in the art will appreciate that implementing all or part of the above-described embodiment methods may be accomplished by way of a computer program instructing the relevant hardware, and that the computer program 13 may be stored in a computer readable storage medium, which when executed may comprise the embodiment methods as described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for controlling the purity of a gas in an electrolytic cell, comprising:
acquiring the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell;
acquiring the variation trend of the hydrogen content in the oxygen in the electrolytic tank according to the pressure and the pressure difference of the cathode side and the anode side;
adjusting the pressure of the cathode side and/or the anode side based on the trend of change;
wherein, obtain the change trend of the hydrogen content in the oxygen in the said electrolytic cell according to the pressure difference of the said cathode side and said anode side, including: inputting the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell into a preset oxygen hydrogen content prediction model; acquiring the variation trend of the hydrogen content in oxygen through the preset oxygen hydrogen content prediction model;
The process for constructing the predictive model of the hydrogen content in the preset oxygen comprises the following steps: constructing an initial oxygen hydrogen content prediction model according to the gas mixed flux, the hydrogen diffusion flux and the hydrogen pair flow of the hydrogen dissolved in the electrolyte; and constructing a preset oxygen hydrogen content prediction model according to the oxygen hydrogen dynamic impurity accumulation process and the initial oxygen hydrogen content prediction model.
2. The method according to claim 1, characterized in that adjusting the pressure of the cathode side and/or the anode side based on the trend of change comprises:
judging whether the hydrogen content in the oxygen keeps continuously increasing and exceeds a first set value or not based on the change trend;
if the pressure keeps continuously increasing and exceeds the first set value, calculating the adjusting parameters of the cathode side and the anode side, and adjusting the pressure of the cathode side and/or the anode side according to the adjusting parameters;
if the continuous increase is not maintained or the first set point is not exceeded, the pressure on the cathode side and/or the anode side is not regulated.
3. The method according to claim 2, characterized in that adjusting the pressure of the cathode side and/or the anode side according to the adjustment parameter comprises:
Judging whether the liquid level of the gas-liquid separator after adjustment exceeds a preset upper limit and a preset lower limit according to the adjustment parameters;
if the pressure of the cathode side or the anode side is not higher than the preset upper limit and lower limit, regulating the pressure of the anode side or the cathode side according to the regulating parameter so that the pressure of the anode side is higher than the pressure of the cathode side;
if the preset upper and lower limits are exceeded, the pressures on the cathode side and the anode side are simultaneously reduced.
4. The method according to claim 2, characterized by further comprising, after adjusting the pressure of the cathode side and/or the anode side according to the adjustment parameter:
predicting whether the hydrogen content in the oxygen is lower than a second set value according to the regulated pressure and pressure difference of the cathode side and the anode side;
and if the pressure is lower than the second set value, respectively restoring the pressure on the cathode side and the pressure on the anode side to the pressure before adjustment.
5. The method of claim 2, wherein the adjustment parameters include an adjustment pressure difference and an adjustment time, and the calculating adjustment parameters of the cathode side and the anode side includes:
acquiring the regulating pressure difference and the regulating time according to the relation among the pressure and the pressure difference of the cathode side and the anode side, the liquid level of the gas-liquid separator and the hydrogen content in oxygen under the preset working condition;
The manner of adjusting the pressure of the cathode side and/or the anode side according to the adjustment parameters is:
based on the regulation parameters, the pressure of the cathode side and/or the anode side of the electrolytic cell is regulated by a first pressure regulating valve and a second pressure regulating valve provided at the cathode side outlet and the anode side outlet, respectively.
6. The method for controlling the purity of the gas in the electrolytic tank according to claim 1, further comprising, before constructing the model for predicting the hydrogen content in the initial oxygen from the gas mixture flux of the hydrogen dissolved in the electrolytic solution, the hydrogen diffusion flux and the hydrogen versus flow rate:
acquiring a gas mixing flux according to the concentration of hydrogen on the cathode side and the flow rate of the electrolyte;
obtaining hydrogen diffusion flux according to the effective diffusion coefficient of hydrogen permeating the membrane, the thickness of the membrane and the concentration difference of hydrogen;
the hydrogen to flow rate is obtained according to the pressure difference between the cathode side and the anode side, the permeability of the diaphragm, the dynamic viscosity of the electrolyte, the solubility of hydrogen in the catholyte, the pressure of the cathode side and the thickness of the diaphragm.
7. The method according to claim 1, characterized in that the pressure on the cathode side and/or the anode side is regulated by regulating the flow rate of gas release on the cathode side and/or the anode side by means of a first pressure regulating valve and a second pressure regulating valve provided at the cathode side outlet and the anode side outlet, respectively, of the electrolytic cell.
8. The utility model provides an electrolysis trough gas purity control system, its characterized in that includes controller, differential pressure transmitter, first pressure regulating valve, second pressure regulating valve, cathode pressure gauge and anode pressure gauge all with the controller is connected, first pressure regulating valve and second pressure regulating valve set up respectively in the positive pole side export and the negative pole side export of electrolysis trough, cathode pressure gauge and anode pressure gauge set up respectively in the positive pole side and the negative pole side of electrolysis trough, first pressure regulating valve is used for adjusting anode side pressure, second pressure regulating valve is used for adjusting cathode side pressure, the cathode pressure gauge is used for collecting the pressure of the negative pole side of collector-electrolyzer, the anode pressure gauge is used for collecting pressure of an anode side of the electrolytic tank, the differential pressure transmitter is used for collecting pressure differences of a cathode side and an anode side of the electrolytic tank, the controller is used for receiving the pressure differences collected by the differential pressure transmitter, the pressure of the cathode side collected by the cathode pressure gauge and the pressure of the anode side collected by the anode pressure gauge, obtaining a change trend of the hydrogen content in oxygen in the electrolytic tank according to the pressure and the pressure differences of the cathode side and the anode side of the electrolytic tank, controlling the first pressure regulating valve and/or the second pressure regulating valve based on the change trend, and regulating the pressure of the cathode side and/or the anode side, wherein the change trend of the hydrogen content in the oxygen in the electrolytic tank is obtained according to the pressure differences of the cathode side and the anode side, and the method comprises the following steps: inputting the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell into a preset oxygen hydrogen content prediction model; acquiring the variation trend of the hydrogen content in oxygen through the preset oxygen hydrogen content prediction model;
The process for constructing the predictive model of the hydrogen content in the preset oxygen comprises the following steps: constructing an initial oxygen hydrogen content prediction model according to the gas mixed flux, the hydrogen diffusion flux and the hydrogen pair flow of the hydrogen dissolved in the electrolyte; constructing a preset oxygen hydrogen content prediction model according to an oxygen hydrogen dynamic impurity accumulation process and the initial oxygen hydrogen content prediction model;
the gas purity control system of the electrolytic tank further comprises a hydrogen-in-oxygen sensor and an oxygen regulating valve which are arranged at an oxygen side gas outlet, a hydrogen regulating valve which is arranged at a hydrogen side gas outlet, an oxygen side gas-liquid separator, a liquid level transmitter, a scrubber, a cooler and a gas-water separator which are also arranged on an oxygen side pipeline, a hydrogen side gas-liquid separator, a liquid level transmitter, a scrubber, a cooler and a gas-water separator which are also correspondingly arranged on the oxygen side pipeline, a first pressure regulating valve and a second pressure regulating valve are respectively arranged at an anode side outlet and a cathode side outlet of the electrolytic tank, one end of the first pressure regulating valve is connected with the anode side of the electrolytic tank, the other end of the first pressure regulating valve is connected with the oxygen side gas-liquid separator, and one end of the second pressure regulating valve is connected with the cathode side of the electrolytic tank, and the other end of the second pressure regulating valve is connected with the hydrogen side gas-liquid separator.
9. An electrolyzer gas purity control apparatus comprising:
an acquisition module for acquiring the pressure and pressure difference of the cathode side and the anode side of the electrolytic cell;
the prediction module is used for obtaining the change trend of the hydrogen content in the oxygen in the electrolytic cell according to the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell;
an adjustment module for adjusting the pressure on the cathode side and/or the anode side based on the trend of variation;
wherein, obtain the change trend of the hydrogen content in the oxygen in the said electrolytic cell according to the pressure difference of the said cathode side and said anode side, including: inputting the pressure and the pressure difference of the cathode side and the anode side of the electrolytic cell into a preset oxygen hydrogen content prediction model; acquiring the variation trend of the hydrogen content in oxygen through the preset oxygen hydrogen content prediction model;
the process for constructing the predictive model of the hydrogen content in the preset oxygen comprises the following steps: constructing an initial oxygen hydrogen content prediction model according to the gas mixed flux, the hydrogen diffusion flux and the hydrogen pair flow of the hydrogen dissolved in the electrolyte; and constructing a preset oxygen hydrogen content prediction model according to the oxygen hydrogen dynamic impurity accumulation process and the initial oxygen hydrogen content prediction model.
10. A computer-readable storage medium storing computer instructions for causing the computer to execute the method of controlling the purity of the electrolytic cell gas according to any one of claims 1 to 7.
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