Method and system for monitoring, regulating and controlling internal temperature of electrolytic cell based on fiber bragg grating

Abstract

The embodiment of the invention provides a method and system for monitoring, regulating and controlling the internal temperature of an electrolytic bath based on a fiber bragg grating, and the method comprises the steps: transmitting an optical signal carrying temperature information through an optical fiber cable embedded in a bipolar plate; obtaining real-time temperature data according to the temperature information in the optical signal through an optical fiber temperature measuring device; receiving and displaying the real-time temperature data through a temperature monitoring display module, and sending the real-time temperature data to an electrolytic cell test regulation and control platform; judging and analyzing according to the real-time temperature data and the preset test temperature of the electrolytic cell through the electrolytic cell test regulation and control platform, and generating a temperature regulation and control instruction according to an analysis result; and receiving the temperature regulation control instruction through the electrolytic bath test system, and regulating the temperature of the electrolytic bath.

Description

Technical Field

[0001] This document relates to the technical field of hydrogen energy and fuel cells, and in particular to a method and system for monitoring and regulating the internal temperature of an electrolyzer based on fiber Bragg grating. Background Art

[0002] Electrolytic water hydrogen production is widely regarded as the main way to produce green hydrogen from renewable energy in the future. As the most core equipment of the electrolytic water hydrogen production system, the actual operating temperature of the electrolyzer has a great impact on the electrolysis performance. Electrolytic water hydrogen production is a complex two-phase flow process involving electricity, heat, and mass. At present, in the process of technological innovation, iteration, and commercial promotion, in addition to facing market tests, there are also problems with unclear internal reaction mechanisms. The measurement and regulation of key parameters are necessary supports for researching the internal electrochemical processes, reaction kinetics, and structure-activity relationships of the electrolyzer, especially the monitoring of the temperature, which has an important impact on the electrochemical reaction rate in the electrolyzer.

[0003] For the measurement of the electrolyzer temperature, in current practical applications, it is generally achieved by arranging temperature sensors at relevant measuring points outside the electrolyzer, such as at the inlet of the electrolyzer in the circulating water system, or inside the water supply side end plate (drilling holes), or on the water supply side end plate (pasting patches), etc. From the measuring positions, it can be seen that the internal temperature of the electrolyzer is not actually measured, and it is affected by the heat dissipation of the electrolyzer itself and the thermal conduction isolation of the insulating gasket between the end plate and the electrode plate, resulting in large measurement errors. There are also projects that measure the temperature by inserting thermocouples through holes in the electrode plate, but this method is only applied to small-scale single cells for research purposes (because cost is not considered and the electrode plate is thicker), that is, it is suitable for measuring the internal temperature of small-area single cells. However, the electrode plates of large-scale electrolyzers are thinner (generally not exceeding 5 mm) and tend to be thinner, making it difficult to measure the temperature by drilling holes in the electrode plate. Therefore, it is difficult and risky to carry out multi-point temperature measurement and real-time temperature measurement inside the cell.

[0004] The prior art has proposed a method of arranging temperature sensing probes by drilling holes in the electrode plates. In addition to considering the challenges and limitations brought by the thickness of the electrode plates, the method of arranging sensing probes by drilling holes to measure the internal temperature of the electrolytic cell still has limitations in terms of the number of measurement points, measurement distance, etc., and its practicability is relatively low. On the one hand, currently, the minimum size of the temperature sensing probe can only reach the millimeter level. Arranging it on the electrode plate of the same millimeter level by drilling holes is difficult to operate and is very likely to affect the performance and service life of the electrolytic cell, and it is inconvenient to arrange multiple probes to achieve multi-point temperature measurement. On the other hand, currently, except for the temperature sensor based on fiber grating, the effective transmission distance of conventional temperature sensors can barely reach 100 meters at most, and it is required to be in a relatively open and simple environment, which is not suitable for safe and accurate temperature measurement in an environment where flammable and explosive hydrogen is generated. At the same time, currently, for the temperature control of the electrolyzed water system, due to the limitations of the current temperature measurement method, only single-point or average temperature data can be obtained, and the actual temperature obtained is the medium temperature outside the electrolytic cell, resulting in the inability to support the early detection of abnormal phenomena in the electrolytic cell and the early further taking of treatment measures.

[0005] In summary, due to the complex environment of strong corrosion, large current, high temperature, and multi-phase states inside the electrolytic cell and the limited structural space, there are still three difficulties in the current measurement and control of its internal temperature: First, the technology for real-time and accurate monitoring of the internal temperature of the electrolytic cell is lacking; second, the method for monitoring the multi-point temperature inside the electrolytic cell and locating the temperature abnormal points is blank; third, the strategy for accurately regulating the operating parameters based on the temperature of the electrolytic cell and early identifying abnormal states is imperfect. Summary of the Invention

[0006] The purpose of the present invention is to provide a method and system for monitoring and regulating the internal temperature of an electrolytic cell based on fiber grating, aiming to solve the above problems in the prior art.

[0007] The present invention provides a method for monitoring and regulating the internal temperature of an electrolytic cell based on fiber grating, including:

[0008] Sending an optical signal carrying temperature information through an optical fiber cable buried in the bipolar plate;

[0009] Obtaining real-time temperature data according to the temperature information in the optical signal through an optical fiber temperature measurement device;

[0010] Receiving the real-time temperature data through a temperature monitoring and display module and displaying it, and sending the real-time temperature data to the electrolytic cell test and regulation platform;

[0011] Judging and analyzing according to the real-time temperature data and the preset temperature of the electrolytic cell test through the electrolytic cell test and regulation platform, and generating a temperature adjustment control instruction according to the analysis result;

[0012] Receiving the temperature adjustment control instruction through the electrolytic cell test system and adjusting the temperature of the electrolytic cell.

[0013] The present invention provides an internal temperature monitoring and regulation system for an electrolytic cell based on fiber Bragg gratings, comprising:

[0014] An optical fiber cable embedded in a bipolar plate for transmitting an optical signal carrying temperature information;

[0015] An optical fiber temperature measuring device for obtaining real-time temperature data according to the temperature information in the optical signal;

[0016] A temperature monitoring and display module for receiving and displaying the real-time temperature data and sending the real-time temperature data to an electrolytic cell test and regulation platform;

[0017] The electrolytic cell test and regulation platform is used for judging and analyzing according to the real-time temperature data and a preset temperature of the electrolytic cell test, and generating a temperature adjustment and control instruction according to the analysis result;

[0018] An electrolytic cell test system for receiving the temperature adjustment and control instruction and adjusting the temperature of the electrolytic cell.

[0019] An embodiment of the present invention also provides an electronic device, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the computer program is executed by the processor, the steps of the above-mentioned method for monitoring and regulating the internal temperature of an electrolytic cell based on fiber Bragg gratings are implemented.

[0020] An embodiment of the present invention also provides a computer-readable storage medium, on which an implementation program for information transmission is stored. When the program is executed by a processor, the steps of the above-mentioned method for monitoring and regulating the internal temperature of an electrolytic cell based on fiber Bragg gratings are implemented.

[0021] Adopting the embodiment of the present invention helps to solve problems such as the lack of internal temperature measurement technology for electrolytic cells and the difficulty of precise regulation, supports research on the performance and life attenuation of electrolytic cells, evaluation and analysis, and the evolution law of key parameters of hydrogen production systems, and further helps the iterative upgrade of electrolytic water hydrogen production technology and the efficient operation of the system. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in one or more embodiments of this specification or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in this specification. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a flowchart of the method for monitoring and regulating the internal temperature of an electrolytic cell based on fiber Bragg gratings according to an embodiment of the present invention;

[0024] Figure 2 It is a processing schematic diagram of the method for monitoring and regulating the internal temperature of an electrolytic cell based on fiber Bragg grating according to an embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the vertical cross-section of the fiber optic cable layout according to an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the cross-section of the fiber optic cable layout according to an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the temperature regulation process inside the electrolytic cell according to an embodiment of the present invention;

[0028] Figure 6 It is a schematic diagram of the system for monitoring and regulating the internal temperature of an electrolytic cell based on fiber Bragg grating according to an embodiment of the present invention. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the following will clearly and completely describe the technical solutions in one or more embodiments of this specification with reference to the accompanying drawings in one or more embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this document.

[0030] Method embodiments

[0031] According to an embodiment of the present invention, there is provided a method for monitoring and regulating the internal temperature of an electrolytic cell based on fiber Bragg grating, Figure 1 It is a flowchart of the method for monitoring and regulating the internal temperature of an electrolytic cell based on fiber Bragg grating according to an embodiment of the present invention. As Figure 1 shown, the method for monitoring and regulating the internal temperature of an electrolytic cell based on fiber Bragg grating according to an embodiment of the present invention specifically includes:

[0032] Step S101, sending an optical signal carrying temperature information through a fiber optic cable buried in the bipolar plate;

[0033] In the embodiment of the present invention, before executing step S101, it further includes:

[0034] Burying the fiber optic cable inside the bipolar plate and parallel to the plane of the effective reaction flow field area;

[0035] Determining the laying quantity and laying position of the fiber optic cable according to the requirements of temperature measurement in different regions;

[0036] Determine the burial depth according to the influence of the channel etching or stamping on the optical fiber cable.

[0037] Step S102: Obtain real-time temperature data through the optical fiber temperature measurement device according to the temperature information in the optical signal;

[0038] Step S103: Receive the real-time temperature data through the temperature monitoring and display module, display it, and send the real-time temperature data to the electrolytic cell test and regulation platform; specifically including:

[0039] Receive the real-time temperature data through the temperature monitoring and display module. Based on the real-time temperature data, display characteristic graphs and characteristic quantities such as the average temperature, temperature change rate curve, temperature distribution map, maximum temperature, and the proportion of abnormal temperature measurement points in real time, and provide a data query interface to alarm for over-temperature and too-fast temperature rise.

[0040] Step S104: Judge and analyze according to the real-time temperature data and the preset temperature of the electrolytic cell test through the electrolytic cell test and regulation platform, and generate a temperature adjustment control instruction according to the analysis result;

[0041] Before giving a detailed description, it should be noted first that the working voltage of the electrolytic cell is generally 1.48V higher than the thermal neutral voltage. At this time, heat is generated during the electrolysis process, and the amount of heat generated is proportional to the electrolysis current. When the electrolysis current remains unchanged, the environmental temperature and conditions remain unchanged, the heat generated by electrolysis can be basically balanced with the heat dissipated by the electrolytic cell into the environment and the heat carried away by the electrolyte, that is, the temperature in the electrolytic cell is theoretically stable. When the electrolysis current increases, the amount of heat generated by the electrolytic cell increases. If the heat dissipation and heat exchange (electrolyte temperature, flow rate) remain unchanged, the temperature in the electrolytic cell will rise. Step S104 specifically includes:

[0042] The electrolytic cell test regulation platform determines whether the temperature in the cell is abnormal based on the real-time temperature data of each measuring point. If it is judged that the temperature is abnormal and the average temperature of each measuring point is higher than the temperature allowable range based on the preset temperature of the electrolytic cell test, it is further determined whether there are measuring points with abnormally high temperatures. If there are and the number of measuring points with abnormally high temperatures exceeds the limit ratio X%, an instruction to stop running is sent to the electrolytic cell test system; if the number of measuring points with abnormally high temperatures does not exceed the limit ratio X%, after determining the anode and cathode attributes of the plate where the temperature abnormal measuring point belongs (where the anode and cathode attributes include: anode plate or cathode plate), an instruction to increase the circulating water volume of the corresponding polarity (anode plate or cathode plate) is sent to the electrolytic cell test system, and at the same time, the temperature situation is continuously observed until the temperatures of all measuring points in the cell are maintained within the temperature allowable range; if there are no measuring points with abnormally high temperatures, it is determined that the overall temperature in the electrolytic cell is too high, then the control quantity is initially calculated based on the difference between the preset temperature To of the electrolytic cell test and the actually monitored temperature, and the heat production change number of the electrolytic cell is calculated based on the operating current of the electrolytic cell in the next stage. Furthermore, the control quantity is optimized by combining the heat production change number and the heat loss change amount brought by the rise and fall of the ambient temperature, and then an instruction to adjust the heat exchange and cooling system to cool the electrolytic cell is sent to the electrolytic cell test system. If it is judged that the temperature is abnormal and the average temperature of each measuring point is lower than the temperature allowable range, the control quantity is initially calculated based on the difference between the preset temperature To of the electrolytic cell test and the actually monitored temperature, and the heat production change number of the electrolytic cell is calculated based on the operating current of the electrolytic cell in the next stage. Furthermore, the control quantity is optimized by combining the heat production change number and the heat loss change amount brought by the rise and fall of the ambient temperature, and then an instruction to adjust the heat exchange and cooling system to heat the electrolytic cell is sent to the electrolytic cell test system, and at the same time, the temperature situation is continuously observed until the temperatures of all measuring points in the cell are maintained within the temperature allowable range. Among them, the temperature allowable range based on the preset temperature of the electrolytic cell test is determined according to To ± t °C, where To represents the preset temperature of the electrolytic cell test, and t is a set value based on the project index requirements and actual experience.

[0043] Among them, initially calculating the preliminary control quantity based on the difference between the preset temperature To of the electrolytic cell test and the actually monitored average temperature, and calculating the heat production change number of the electrolytic cell based on the operating current of the electrolytic cell in the next stage, and optimizing the control quantity by combining the heat production change number and the heat loss change amount brought by the rise and fall of the ambient temperature specifically includes:

[0044] Based on Formula 1, according to the preset temperature T of the electrolytic cell test o and the difference between the actually monitored average temperature T to initially calculate the preliminary control quantity T cO, according to Formula 2, calculate the change in heat generation power P of the electrolytic cell based on the next-stage operating current I2 of the electrolytic cell, the current operating current I1, and the electrolytic voltages V1 and V2 corresponding to the currents, and according to Formula 3, adjust the change in heat generation power of the electrolytic cell by combining the heat loss power p caused by the change in the ambient temperature to obtain the adjusted change in heat generation power P of the electrolytic cell c , based on Formula 4, according to the adjusted net heat power P c calculate the temperature change value T w , based on Formula 5, according to the temperature change value T w optimize the temperature control quantity Tc;

[0045] T cO = T0 - T Formula 1;

[0046] P = P2 - P1 = I1*(V1 - V o ) - I2*(V2 - V0) Formula 2;

[0047] P c = P - (p2 - p1) Formula 3;

[0048]

[0049] T C = T C - T co Formula 5;

[0050] Among them, V1 and V2 are the total voltages of the electrolytic cell, I1 and I2 are the currents of the electrolytic cell, V2 is the estimated value, I2 is the set value, V0 is the thermal neutral voltage, P2 and P1 respectively represent the heat generation powers of the electrolytic cell in the next operating stage and the current operating stage, p1 and p2 are respectively the heat loss powers between the electrolytic cell and the surrounding environment in the next operating stage and the current operating stage, q is the volume flow rate of the electrolyte, ρ is the density of the electrolyte, and c is the specific heat capacity of the electrolyte

[0051] Step S105, receive the temperature adjustment control instruction through the electrolytic cell test system and perform electrolytic cell temperature adjustment

[0052] The above technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings

[0053] As Figure 2As shown in the figure, the present invention provides a method for monitoring and regulating the internal temperature of an electrolytic cell based on fiber Bragg grating sensing technology, which generally includes three parts: the laying method of optical fiber cables in the bipolar plates inside the electrolytic cell, the internal temperature monitoring module of the electrolytic cell, and the internal temperature regulation strategy of the electrolytic cell. The specific temperature monitoring and regulation method system is as follows: ① The optical fiber cables buried in the bipolar plates transmit the optical signals carrying temperature information to the internal fiber optic temperature measuring device of the electrolytic cell; ② The fiber optic temperature measuring device processes, converts, and calculates the optical signals to obtain the temperature data and transmits it to the internal temperature monitoring and display module of the electrolytic cell; ③ The temperature monitoring and display module further transmits the temperature characteristic information to the electrolytic cell test and regulation platform while visually displaying the real-time temperature inside the cell; ④ The electrolytic cell test and regulation platform judges and analyzes according to the preset temperature of the electrolytic cell test and the received real-time temperature to form a temperature adjustment control instruction; ⑤ The electrolytic cell test and regulation platform transmits the temperature regulation instruction to the electrolytic cell test system to adjust the temperature of the electrolytic cell.

[0054] Specifically, as Figure 3 and Figure 4 shown, inside the bipolar plate, parallel to the plane of the effective reaction flow field area, optical fiber cables are regularly buried. The laying quantity and position should meet the measurement of temperatures in different areas, and the influence of flow channel etching or stamping on the optical cable should be prevented by reasonably designing the burial depth. Taking a circular electrolytic cell with a 2-mm-thick direct current channel bipolar plate as an example, in the middle part inside the bipolar plate, along the diameter direction, an optical cable with a diameter not exceeding 100 μm is buried every 45° (refer to Figure 4 for illustration). If a distributed optical fiber cable that can use the entire optical fiber cable as a sensitive point is adopted, continuous real-time monitoring of the space where it is located can be realized, and the design of measurement points does not need to be further considered; if multi-point sensing is adopted, as Figure 4 shown, measurement points (sensitive points) are designed at different parts such as the corresponding edges and the middle in the reaction area.

[0055] The optical fiber cables buried in the bipolar plates transmit the optical signals carrying temperature information to the internal fiber optic temperature measuring device of the electrolytic cell. The fiber optic temperature measuring device processes, converts, and calculates the optical signals to obtain the temperature data and transmits it to the internal temperature monitoring and display module of the electrolytic cell. The internal temperature monitoring and display module of the electrolytic cell visually displays in real time characteristic graphs and characteristic quantities such as the average temperature, temperature change rate curve, temperature distribution map, maximum temperature, and the proportion of temperature abnormal measurement points. At the same time, functions such as data query, over-temperature and too-fast temperature rise alarm are designed.

[0056] As Figure 5 shown, the electrolytic cell test and regulation platform judges and analyzes according to the preset temperature of the electrolytic cell test and the received real-time temperature to form a temperature adjustment control instruction, and transmits the instruction to the electrolytic cell test system to adjust the temperature of the electrolytic cell. First, it judges whether the temperature inside the cell is abnormal, such as whether the average temperature inside the cell is too high or too low:

[0057] 1) If the average temperature is on the high side, further determine whether there is a measurement point with an abnormally high temperature. If so, when there are more than a limited proportion x% (for example, 5%, indicating that 5% of the measurement points have abnormally high temperatures among the measured points. x can be set based on the size of the electrolytic cell and the number of temperature measurement points, combined with practical experience) of the measurement points with abnormally high temperatures (for example, the temperature exceeds the preset temperature of the electrolytic cell operating state by no less than 5°C), it indicates that abnormal situations such as catalyst agglomeration or obvious thinning of the membrane have occurred inside the electrolytic cell. Continuing to operate at high temperatures may affect the life of the electrolytic cell and even cause safety problems such as membrane burnout and gas cross - leakage. At this time, the electrolytic cell test and control platform sends an instruction to stop the operation to the electrolytic cell test system; when the number of measurement points with abnormally high temperatures does not exceed x%, it indicates that there may be tiny impurities in the cell temporarily affecting fluid flow, resulting in less local electrolyte flow or even not being covered by the electrolyte. Consider increasing the circulating water volume to discharge the impurities through the impact force, and at the same time continue to observe the temperature situation until the temperatures of all measurement points in the cell are maintained within the allowable range (the temperatures of all measurement points are within the range of the preset temperature To±t°C of the electrolytic cell operating state. For example, t = 5, and t can be set according to the project index requirements combined with practical experience). If there are no measurement points with abnormally high temperatures, it indicates that the overall temperature in the cell is too high. Then, cool down the electrolytic cell by adjusting the heat exchange and cooling system, and at the same time continue to observe the temperature situation until the temperature in the cell is maintained within the allowable range.

[0058] 2) If the average temperature is on the low side, then heat up the electrolytic cell by adjusting the heat exchange and cooling system, and at the same time continue to observe the temperature situation until the temperature in the cell is maintained within the allowable range.

[0059] In summary, the technical solution of the embodiment of this method helps to solve problems such as the lack of internal temperature measurement technology and the difficulty of precise control in electrolytic cells, supports the research on the performance and life attenuation of electrolytic cells, evaluation and analysis, and the evolution law of key parameters of the hydrogen production system, and further helps the iterative upgrade of the electrolytic water hydrogen production technology and the efficient operation of the system.

[0060] System Embodiment 1

[0061] According to an embodiment of the present invention, a fiber - Bragg - grating - based internal temperature monitoring and control system for an electrolytic cell is provided. Figure 6 It is a schematic diagram of the fiber - Bragg - grating - based internal temperature monitoring and control system for an electrolytic cell according to an embodiment of the present invention, as Figure 6 shown. The fiber - Bragg - grating - based internal temperature monitoring and control system for an electrolytic cell according to an embodiment of the present invention specifically includes:

[0062] An optical fiber cable 60 buried in the bipolar plate, which is used to send optical signals carrying temperature information; wherein, the optical fiber cable is buried inside the bipolar plate and parallel to the plane of the effective reaction flow field area; the laying quantity and laying position are determined according to the requirements of temperature measurement in different regions, and the buried depth is determined according to the influence of flow channel etching or stamping on the optical fiber cable.

[0063] The optical fiber temperature measurement device 62 is used to obtain real-time temperature data based on the temperature information in the optical signal;

[0064] The temperature monitoring and display module 64 is used to receive the real-time temperature data, display it, and send the real-time temperature data to the electrolytic cell test and regulation platform; specifically for: receiving the real-time temperature data through the temperature monitoring and display module, based on the real-time temperature data, displaying characteristic graphs and characteristic quantities such as the average temperature, temperature change rate curve, temperature distribution map, maximum temperature, and the proportion of temperature abnormal measurement points in real time, and providing a data query interface to alarm for over-temperature and too-fast temperature rise;

[0065] The electrolytic cell test and regulation platform 66 is used to make a judgment and analysis based on the real-time temperature data and the preset temperature of the electrolytic cell test, and generate a temperature adjustment and control instruction according to the analysis result; specifically for:

[0066] Through the electrolytic cell test and regulation platform, it is judged whether the temperature in the cell is abnormal according to the real-time temperature data of each measurement point. If the judgment is abnormal and the average temperature of each measurement point is higher than the temperature allowable range based on the preset temperature of the electrolytic cell test, it is further judged whether there are measurement points with abnormally high temperatures. If there are and the number of measurement points with abnormally high temperatures exceeds the limit ratio X%, an instruction to stop running is sent to the electrolytic cell test system; if the number of measurement points with abnormally high temperatures does not exceed the limit ratio X%, an instruction to increase the circulating water volume to discharge impurities through impact force is sent to the electrolytic cell test system, and at the same time, the temperature situation is continuously observed until the temperature in the cell is maintained within the temperature allowable range. If there are no measurement points with abnormally high temperatures, it is determined that the overall temperature in the electrolytic cell is too high, and an instruction to adjust the heat exchange and cooling system to heat up the electrolytic cell is sent to the electrolytic cell test system; if the judgment is abnormal and the average temperature of each measurement point is lower than the temperature allowable range, an instruction to adjust the heat exchange and cooling system to heat up the electrolytic cell is sent to the electrolytic cell test system, and at the same time, the temperature situation is continuously observed until the temperature in the cell is maintained within the temperature allowable range. Among them, the temperature allowable range based on the preset temperature of the electrolytic cell test is determined according to To±t℃, where To represents the preset temperature of the electrolytic cell test, and t is a set value based on project index requirements and actual experience.

[0067] The electrolytic cell test and regulation platform 66 is specifically used for:

[0068] Based on Formula 1, according to the preset temperature T of the electrolytic cell test o and the difference between the actually monitored average temperature T, the preliminary control quantity T is initially calculated cO, according to Formula 2, calculate the change in the heat generation power P of the electrolytic cell based on the operating current I2 of the next stage of the electrolytic cell, the current operating current I1, and the electrolytic voltages V1 and V2 corresponding to the respective currents, and according to Formula 3, adjust the change in the heat generation power of the electrolytic cell by combining the heat loss power p caused by the change in the ambient temperature to obtain the adjusted change in the heat generation power P of the electrolytic cell c , based on Formula 4, according to the adjusted net heat power P c calculate the temperature change value T w , based on Formula 5, according to the temperature change value T w optimize the temperature control quantity Tc;

[0069] T cO = T0 - T Formula 1;

[0070] P = P2 - P1 = I1*(V1 - V o ) - I2*(V2 - V0) Formula 2;

[0071] P c = P - (p2 - p1) Formula 3;

[0072]

[0073] T C = T C - T co Formula 5;

[0074] Among them, V1 and V2 are the total voltages of the electrolytic cell, I1 and I2 are the currents of the electrolytic cell, V2 is the estimated value, I2 is the set value, V0 is the thermal neutral voltage, P2 and P1 respectively represent the heat generation powers of the electrolytic cell in the next operating stage and the current operating stage, p1 and p2 are respectively the heat loss powers between the electrolytic cell and the surrounding environment in the next stage of operation and the current stage of operation, q is the volume flow rate of the electrolyte, ρ is the density of the electrolyte, and c is the specific heat capacity of the electrolyte.

[0075] The electrolytic cell test system 68 is used to receive the temperature adjustment control instruction and perform electrolytic cell temperature adjustment.

[0076] The embodiment of the present invention is a device embodiment corresponding to the above method embodiment. The specific operations of each module can be understood with reference to the description of the method embodiment and will not be elaborated here.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for monitoring and controlling the internal temperature of an electrolytic cell based on fiber grating, characterized in that: include: An optical signal carrying temperature information is sent through an optical fiber cable buried in the bipolar plate; Obtaining real-time temperature data according to the temperature information in the optical signal by means of an optical fiber temperature measuring device; The real-time temperature data is received and displayed through a temperature monitoring and display module, and the real-time temperature data is sent to an electrolytic cell test and control platform; The electrolytic cell test control platform performs judgment and analysis based on the real-time temperature data and the preset temperature of the electrolytic cell test, and generates a temperature adjustment control instruction based on the analysis result; The temperature adjustment control instruction is received by the electrolytic cell testing system to adjust the temperature of the electrolytic cell.

2. The method according to claim 1, characterized in that Before sending an optical signal carrying temperature information through an optical fiber cable embedded in the bipolar plate, the method further comprises: The optical fiber cable is buried inside the bipolar plate and parallel to the plane of the effective reaction flow field area; Determine the number and location of the optical fiber cables according to the temperature measurement requirements of different areas; The burial depth is determined based on the effect of channel etching or punching on the optical fiber cable.

3. The method according to claim 1, characterized in that Receiving the real-time temperature data and displaying it through the temperature monitoring and display module specifically includes: The real-time temperature data is received through the temperature monitoring and display module, and based on the real-time temperature data, the average temperature, temperature change rate curve, temperature distribution diagram, maximum temperature, characteristic diagram and characteristic quantity of abnormal temperature measurement points are displayed in real time, and a data query interface is provided to alarm for overtemperature and rapid temperature rise.

4. The method according to claim 1, characterized in that: The electrolytic cell test control platform performs judgment and analysis based on the real-time temperature data and the preset temperature of the electrolytic cell test, and generates temperature adjustment control instructions based on the analysis results, specifically including: The electrolytic cell test control platform determines whether the temperature in the cell is abnormal based on the real-time temperature data of each measuring point. If it is determined to be abnormal and the average temperature of each measuring point is higher than the allowable temperature range based on the preset temperature of the electrolytic cell test, it is further determined whether there are measuring points with abnormally high temperatures. If there are and the number of measuring points with abnormally high temperatures exceeds the limit ratio X%, an instruction to stop operation is issued to the electrolytic cell test system; if the number of measuring points with abnormally high temperatures does not exceed the limit ratio X%, an instruction to increase the circulating water volume is issued to the electrolytic cell test system, and the temperature is continuously observed until the temperatures of each measuring point in the cell are maintained within the allowable temperature range. If there are no measuring points with abnormally high temperatures, it is determined that the overall temperature in the electrolytic cell is too high. A preliminary control amount is preliminarily calculated based on the difference between the preset temperature To of the electrolytic cell test and the actual monitored average temperature, and the control amount is calculated based on the next step of the electrolytic cell test. The heat production change of the electrolytic cell is calculated based on the stage operating current, and the control amount is optimized in combination with the heat production change and the heat loss change caused by the increase or decrease of the ambient temperature. Based on the optimized control amount, relevant instructions for adjusting the heat exchange cooling system to cool the electrolytic cell are issued to the electrolytic cell test system; if it is judged to be abnormal and the average temperature of each measuring point is lower than the allowable temperature range, the control amount is preliminarily calculated based on the difference between the preset temperature To of the electrolytic cell test and the actually monitored temperature, and the heat production change of the electrolytic cell is calculated based on the next stage operating current of the electrolytic cell, and the control amount is optimized in combination with the heat production change and the heat loss change caused by the increase or decrease of the ambient temperature, and based on the optimized control amount, an instruction for adjusting the heat exchange cooling system to heat the electrolytic cell is issued to the electrolytic cell test system, and the temperature situation continues to be observed at the same time until the temperature of each measuring point in the cell is maintained within the allowable temperature range.

5. The method according to claim 1, characterized in that The method further: The allowable temperature range based on the preset temperature of the electrolytic cell test is determined according to To±t°C, wherein To represents the preset temperature of the electrolytic cell test, and t is a setting value based on project indicator requirements combined with actual experience.

6. The method according to claim 4, characterized in that The preliminary control quantity is calculated based on the difference between the preset temperature To and the actual monitored average temperature of the electrolytic cell test, and the change in heat production of the electrolytic cell is calculated based on the operating current of the electrolytic cell in the next stage. The optimized control quantity is specifically composed of the change in heat production and the change in heat loss caused by the rise and fall of ambient temperature, including: Based on formula 1, according to the preset temperature T of the electrolyzer test o The difference between the actual monitored average temperature T is used to preliminarily calculate the preliminary control quantity T cO According to formula 2, the change in heat generation power P of the electrolytic cell is calculated based on the next stage operating current I2 of the electrolytic cell, the current operating current I1, and the electrolysis voltages V1 and V2 under the corresponding currents. According to formula 3, the change in heat generation power of the electrolytic cell is adjusted in combination with the heat loss power p caused by the change in ambient temperature. The adjusted change in heat generation power P of the electrolytic cell is obtained. c , based on formula 4, adjust the net heat power P c Calculate the temperature change value T w , based on formula 5, according to the temperature change value T w Optimize temperature control value Tc; T cO =T0-T Formula 1; P=P2-P1=I1*(V1-V o )-I2*(V2-V0) Formula 2; P c =P-(p2-p1) Formula 3; T C =T C -T co Formula 5; Among them, V1 and V2 are the total voltage of the electrolytic cell, I1 and I2 are the electrolytic cell currents, V2 is the estimated value, I2 is the set value, V0 is the thermal neutral voltage, P2 and P1 represent the heat generation power of the electrolytic cell in the next operation stage and the current operation stage respectively, p1 and p2 are the heat loss power between the electrolytic cell and the surrounding environment in the next operation stage and the current operation stage respectively, q is the electrolyte volume flow rate, ρ is the electrolyte density, and c is the specific heat capacity of the electrolyte.

7. A fiber Bragg grating-based electrolytic cell internal temperature monitoring and control system, characterized in that: include: The optical fiber cable buried in the bipolar plate is used to send optical signals carrying temperature information; An optical fiber temperature measuring device, used to obtain real-time temperature data based on the temperature information in the optical signal; A temperature monitoring and display module is used to receive and display the real-time temperature data, and send the real-time temperature data to the electrolytic cell test and control platform; The electrolytic cell test control platform is used to make judgments and analyses based on the real-time temperature data and the preset temperature of the electrolytic cell test, and to generate temperature adjustment control instructions based on the analysis results; The electrolytic cell testing system is used to receive the temperature adjustment control instruction and adjust the temperature of the electrolytic cell.

8. The system according to claim 7, characterized in that The optical fiber cable is buried inside the bipolar plate and parallel to the plane of the effective reaction flow field area; the number and location of the cables are determined according to the requirements of temperature measurement in different areas, and the burial depth is determined according to the influence of flow channel etching or stamping on the optical fiber cable.

9. The system according to claim 7, characterized in that The temperature monitoring and display module is specifically used for: The real-time temperature data is received through the temperature monitoring and display module, and based on the real-time temperature data, the characteristic graph and characteristic quantity of the average temperature, the temperature change rate curve, the temperature distribution diagram, the maximum temperature, and the proportion of abnormal temperature measurement points are displayed in real time, and a data query interface is provided to alarm for over-temperature and excessive temperature rise; The electrolytic cell testing and control platform is specifically used for: The electrolytic cell test control platform determines whether the temperature in the cell is abnormal based on the real-time temperature data of each measuring point. If it is determined to be abnormal and the average temperature of each measuring point is higher than the allowable temperature range based on the preset temperature of the electrolytic cell test, it is further determined whether there are measuring points with abnormally high temperatures. If there are and the number of measuring points with abnormally high temperatures exceeds the limit ratio X%, an instruction to stop operation is issued to the electrolytic cell test system; if the number of measuring points with abnormally high temperatures does not exceed the limit ratio X%, an instruction to increase the amount of circulating water is issued to the electrolytic cell test system, and the temperature is continuously observed until the temperatures of each measuring point in the cell are maintained within the allowable temperature range. If there are no measuring points with abnormally high temperatures, it is determined that the overall temperature in the electrolytic cell is too high. A control amount is preliminarily calculated based on the difference between the preset temperature To of the electrolytic cell test and the actually monitored temperature, and a heat production change of the electrolytic cell is calculated based on the operating current of the electrolytic cell in the next stage. The control amount is optimized in combination with the heat production change and the heat loss change caused by the rise and fall of the ambient temperature. Based on the optimized control amount, a relevant instruction to adjust the heat exchange cooling system to cool the electrolytic cell is issued to the electrolytic cell test system; If it is judged to be abnormal and the average temperature of each measuring point is lower than the allowable temperature range, the control amount is preliminarily calculated based on the difference between the preset temperature To of the electrolytic cell test and the actually monitored temperature, and the heat generation change of the electrolytic cell is calculated based on the operating current of the electrolytic cell in the next stage, and the control amount is optimized by combining the heat generation change and the heat loss change caused by the rise and fall of the ambient temperature, and based on the optimized control amount, an instruction is issued to the electrolytic cell test system to adjust the heat exchange cooling system to heat up the electrolytic cell, and the temperature is continuously observed at the same time until the temperature of each measuring point in the cell is maintained within the allowable temperature range; The electrolytic cell testing and control platform is specifically used for: The allowable temperature range based on the preset temperature of the electrolytic cell test is determined according to To±t°C, wherein To represents the preset temperature of the electrolytic cell test, and t is a setting value based on project indicator requirements combined with actual experience.

10. The system according to claim 9, characterized in that The electrolytic cell testing and control platform is specifically used for: Based on formula 1, according to the preset temperature T of the electrolyzer test o The difference between the actual monitored average temperature T is used to preliminarily calculate the preliminary control quantity T cO According to formula 2, the change in heat generation power P of the electrolytic cell is calculated based on the next stage operating current I2 of the electrolytic cell, the current operating current I1, and the electrolysis voltages V1 and V2 under the corresponding currents. According to formula 3, the change in heat generation power of the electrolytic cell is adjusted in combination with the heat loss power p caused by the change in ambient temperature. The adjusted change in heat generation power P of the electrolytic cell is obtained. c , based on formula 4, adjust the net heat power P c Calculate the temperature change value T w , based on formula 5, according to the temperature change value T w Optimize temperature control value Tc; T cO =T0-T Formula 1; P=P2-P1=I1*(V1-V o )-I2*(V2-V0) Formula 2; P c =P-(p2-p1) Formula 3; T C =T C -T co Formula 5; Among them, V1 and V2 are the total voltage of the electrolytic cell, I1 and I2 are the electrolytic cell currents, V2 is the estimated value, I2 is the set value, V0 is the thermal neutral voltage, P2 and P1 represent the heat generation power of the electrolytic cell in the next operation stage and the current operation stage respectively, p1 and p2 represent the heat loss power between the electrolytic cell and the surrounding environment in the next operation stage and the current operation stage respectively, q is the electrolyte volume flow rate, ρ is the electrolyte density, and c is the specific heat capacity of the electrolyte.

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