Multifunctional hydrogen production circulating system and control method thereof

Abstract

The invention discloses a multifunctional hydrogen production circulating system and a control method thereof. The multifunctional hydrogen production circulating system comprises a water replenishing loop, a deionization circulating loop and an electrolytic bath circulating loop. According to the device, the water supplementing loop, the deionization circulation loop and the electrolytic bath circulation loop are arranged, the connecting position of the deionization circulation loop and the electrolytic bath circulation loop is located in front of the oxygen-water primary liquid separation tank, and the deionization circulation loop and the electrolytic bath circulation loop are connected to the oxygen-water primary liquid separation tank through the turbulent flow preventing mixing pipeline; the turbulent flow phenomenon caused by different water temperatures of the deionization circulation loop and the electrolytic bath circulation loop can be effectively avoided through mixing, the water replenishing loop and the deionization circulation loop can be used for effectively controlling the water inlet conductivity, and the conductivity and temperature of pure water entering the electrolytic bath are stably controlled.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen production systems, and in particular to a multifunctional hydrogen production cycle system and a control method thereof. Background Art

[0002] There are many drawbacks in the current hydrogen production system: first, it is difficult to accurately control the conductivity of the incoming water, causing it to be out of control; second, it is impossible to achieve stable and effective control of the conductivity and temperature of the pure water entering the electrolyzer, and it fluctuates frequently, seriously affecting the efficiency and quality of hydrogen production; third, the energy loss during the operation of the system is huge, and a large amount of energy is wasted for no reason and cannot be reasonably utilized; fourth, from a cost-effectiveness perspective, the economy is poor, the input-output ratio is relatively low, and it is not conducive to long-term operation and market promotion; fifth, in terms of safety, the potential risk factor is quite high, and there are hidden dangers in many links, posing a great threat to personnel, equipment and the surrounding environment. Summary of the invention

[0003] The embodiment of the present application provides a multifunctional hydrogen production circulation system and a control method thereof, which can solve the technical problems that the existing hydrogen production system cannot effectively control the conductivity of the incoming water, cannot stably control the conductivity and temperature of the pure water entering the tank, has serious energy waste, poor economy, and a high safety risk factor.

[0004] The embodiment of the present application provides a multifunctional hydrogen production circulation system, including a water replenishment loop, a deionization circulation loop and an electrolyzer circulation loop; The deionization circulation loop is a deionization circulation pump, a heat exchanger, a deionizer, an electric heater, an oxygen-water primary separation tank, and the deionization circulation pump connected in a ring shape; The electrolytic cell circulation loop is an electrolytic cell circulation pump, a PEM electrolytic cell, the oxygen-water primary separation tank, and an electrolytic cell circulation pump connected in a ring shape; The access point of the water replenishment loop is located between the heat exchanger and the deionization circulation pump; The output end of the electric heater and the anode water outlet of the PEM electrolyzer are combined into one path and connected to the oxygen-water primary liquid separation tank through an anti-turbulence mixing pipeline.

[0005] Furthermore, the water replenishment circuit includes a pure water tank and a water replenishment pump. The pure water tank is provided with a deionized water input pipeline. The pure water tank is connected between the heat exchanger and the deionization circulation pump through the water replenishment pump.

[0006] Furthermore, the cathode water outlet of the PEM electrolyzer is connected to the pure water tank through a hydrogen primary liquid separation tank.

[0007] The present application also provides a control method for a multifunctional hydrogen production cycle system, which comprises: When the multifunctional hydrogen production cycle system is in operation, the conductivity of the oxygen-water primary liquid separation tank is obtained to determine whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to a first threshold value S1; When the conductivity of the oxygen-water primary separation tank is less than a first threshold value S1, the electrolytic cell circulation loop is started; When the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the first threshold value S1, a first delay time is set to determine whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the second threshold value S2, and the second threshold value S2 is greater than the first threshold value S1; When the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the second threshold value S2, the electrolytic cell circulation loop is closed, and it is continued to be determined whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the first threshold value S1; When the conductivity of the oxygen-water primary liquid separation tank is less than the second threshold value S2, it is determined whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to a third threshold value S3, and the third threshold value S3 is greater than the second threshold value S2; When the conductivity of the oxygen-water primary liquid separation tank is greater than a third threshold value S3, the multifunctional hydrogen production circulation system is shut down after a second delay time is set; When the conductivity of the oxygen-water primary liquid separation tank is less than or equal to the third threshold value S3, the deionization circulation loop is set to run at the maximum flow rate, and it is continued to be determined whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the first threshold value S1.

[0008] Furthermore, the control method of the multifunctional hydrogen production cycle system also includes: Determine whether the first delay time has ended, if not, continue to determine whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the first threshold value S1, if so, determine whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the second threshold value S2; It is determined whether the second delay time has ended, if so, the multifunctional hydrogen production circulation system is turned off, if not, it is continued to determine whether the conductivity of the oxygen-water primary separation tank is greater than a third threshold value S3.

[0009] Furthermore, the control method of the multifunctional hydrogen production cycle system also includes: When the conductivity of the oxygen-water primary separation tank is less than a first threshold value S1, the deionization circulation loop is set to calculate the amount of circulating water passing through the deionizer according to the flow limit of the deionization circulation pump and the electrolytic cell circulation pump; When the conductivity of the oxygen-water primary separation tank is greater than or equal to the first threshold value S1, Calculate the first delay time t, where Q is the amount of circulating water passing through the deionizer, and V is the amount of water stored in the system. is the deionizer efficiency, and C(t) is the conductivity of the oxygen-water primary separation tank at different times.

[0010] Furthermore, the control method of the multifunctional hydrogen production cycle system also includes: When the multifunctional hydrogen production cycle system is in operation, the real-time temperature value T1 of the oxygen-water primary liquid separation tank is obtained, the real-time temperature value T2 of the output end of the heat exchanger is obtained, and the set key temperature threshold value T3 of the key regulating valve of the heat exchanger is obtained, and it is determined whether the real-time temperature value T1 of the heat exchanger is greater than the set key temperature threshold value T3 of the key regulating valve of the heat exchanger; When the real-time temperature value T1 of the heat exchanger is greater than the set key temperature threshold value T3 of the key regulating valve of the heat exchanger, the electric heater is turned off; When the real-time temperature value T1 of the heat exchanger is less than or equal to the set key temperature threshold value T3 of the key regulating valve of the heat exchanger, it is determined whether there is flow in the deionization circulation loop; If there is no flow in the deionization circulation loop, the multifunctional hydrogen production circulation system is shut down after a third delay period. If there is flow in the deionization circulation loop, the electric heater is turned on and the real-time temperature value T1 of the heat exchanger is adjusted to the set key temperature threshold T3 of the key regulating valve of the heat exchanger.

[0011] Furthermore, when the real-time temperature value T1 of the heat exchanger is greater than the set key temperature threshold value T3 of the key regulating valve of the heat exchanger, after turning off the electric heater, the method further includes: Obtaining the heat generation Qnet of the PEM electrolyzer and the heat exchange Qexc of the deionization circulation loop; When the heat generation Qnet of the PEM electrolyzer is greater than the heat exchange Qexc of the deionization circulation loop, the real-time temperature value T2 at the output end of the heat exchanger is set to the set temperature threshold T4, wherein the set temperature threshold T4 is greater than the set key temperature threshold T3; according to the real-time temperature value T1 of the heat exchanger and the set temperature threshold T4, the opening of the key regulating valve of the heat exchanger is adjusted by a proportional-integral-differential algorithm; When the heat generation Qnet of the PEM electrolyzer is less than the heat exchange Qexc of the deionization circulation loop, the opening of the key regulating valve of the heat exchanger is adjusted by a proportional-integral-differential algorithm according to the real-time temperature value T1 of the heat exchanger and the set key temperature threshold T3.

[0012] Further, the obtaining of the heat generated by the PEM electrolyzer and the heat exchange amount Qexc of the deionization circulation loop includes: pass Calculate the calorific value of the PEM electrolyzer, where Istack is the total current of the PEM electrolyzer, Acell is the reaction area of ​​the PEM electrolyzer, Ncell is the number of electrolyzer sections of the PEM electrolyzer, Vcell is the voltage of the PEM electrolyzer, and Vth is the electrolysis voltage of the PEM electrolyzer; pass Calculate the heat dissipation of the PEM electrolyzer, where h is the thermal conductivity, Tstack is the stack temperature, and Tamb is the ambient temperature; pass Calculate the heat generation Qnet of the PEM electrolyzer; pass The heat exchange capacity Qexc of the deionization circulation loop is calculated, where C is the specific heat capacity of water, m is the mass of water, and Δt is the temperature difference.

[0013] Furthermore, the method of adjusting the opening of the key regulating valve of the heat exchanger by using the proportional-integral-differential algorithm includes: The proportional-integral-differential algorithm is ; Among them, Kp, Ki, Kd are the proportional gain coefficient, integral gain coefficient and differential gain coefficient respectively, and e(t) is the deviation between the set temperature and the actual temperature.

[0014] Furthermore, the control method of the multifunctional hydrogen production cycle system also includes: When the multifunctional hydrogen production circulation system is in operation, obtaining the flow rate of the PEM electrolyzer and the flow rate of the deionization circulation loop, and calculating the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer; The relationship between the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer and the temperature of the deionization circulation loop is obtained, and the temperature of the deionization circulation loop is adjusted based on the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer.

[0015] The multifunctional hydrogen production circulation system and control method thereof provided in the embodiment of the present application are provided with a water replenishment circuit, a deionization circulation circuit and an electrolyzer circulation circuit. The connection position of the deionization circulation circuit and the electrolyzer circulation circuit is located before the oxygen-water primary liquid separation tank, and is connected to the oxygen-water primary liquid separation tank through an anti-disturbance mixing pipeline. The system can effectively mix and avoid the turbulence phenomenon caused by the different water temperatures of the deionization circulation circuit and the electrolyzer circulation circuit, and the water replenishment circuit and the deionization circulation circuit can be used to effectively control the conductivity of the inlet water and stably control the conductivity and temperature of the pure water entering the electrolyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0017] Figure 1 A schematic diagram of the structure of a multifunctional hydrogen production cycle system provided in an embodiment of the present application; Figure 2 A flow chart of a control method for a multifunctional hydrogen production cycle system provided in an embodiment of the present application; Figure 3 A flow chart of the temperature regulation of the deionization circulation loop of the control method of the multifunctional hydrogen production circulation system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0019] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0020] For details, please refer to Figure 1 , the embodiment of the present application provides a multifunctional hydrogen production circulation system, including a water replenishment loop, a deionization circulation loop and an electrolyzer circulation loop; The deionization circulation loop is a deionization circulation pump P-0102, a heat exchanger E-0101, a deionizer X-0101, an electric heater H-0101, an oxygen-water primary separation tank V-0102, and the deionization circulation pump P-0102 connected in a ring shape; The electrolytic cell circulation loop is an electrolytic cell circulation pump P-0103, a PEM electrolytic cell PK-0201, the oxygen-water primary liquid separation tank V-0102, and an electrolytic cell circulation pump P-0103 connected in a ring shape; The access point of the water replenishment loop is located between the heat exchanger E-0101 and the deionization circulation pump P-0102; The output end of the electric heater H-0101 and the anode water outlet of the PEM electrolyzer PK-0201 merge into one path and are connected to the oxygen-water primary separation tank V-0102 through an anti-turbulence mixing pipeline.

[0021] Among them, the deionized water replenishment temperature of the deionized circulation loop is usually lower than the water temperature of the anode outlet of the PEM electrolyzer PK-0201. The water replenishment point is connected before the heat exchanger E-0101 to reduce the heat exchange of the heat exchanger E-0101, thereby reducing the volume and reducing the system energy consumption.

[0022] The deionized water source of the water replenishment loop may have an electrical conductivity that is inconsistent with expectations due to various uncertain factors or long-term storage or the material of the storage medium not meeting the requirements. Connecting the deionized water before the deionizer X-0101 of the deionization circulation loop can purify this part of the water immediately, thereby avoiding contamination of the system water quality and disturbance of the system conductivity after entering the system.

[0023] The deionization circulation pump P-0102 can increase the flow rate only when the conductivity is abnormal, and operate at a low load when it is normal, thereby reducing the energy consumption of the system. By adjusting the temperature in the oxygen-water primary separation tank V-0102 instead of the electrolytic cell temperature, the temperature change of the system is smoother, reducing the impact of temperature fluctuations on water quality control.

[0024] Among them, the deionized water circulation loop and the electrolytic cell circulation loop are completely independent, avoiding the mutual influence of temperature and water quality fluctuations, making the electrolytic cell operating environment more stable.

[0025] Integrating the heater and heat exchanger in the deionization circulation loop can prevent the PEM electrolyzer PK-0201 from entering at the initial stage of operation (unqualified conductivity and temperature). The dual circuits are independent of each other and do not interfere with each other, which not only protects the PEM electrolyzer PK-0201 but also makes the control more stable. Since the flow rate of the deionization circuit is lower, the volume of the electric heater H-0101 and the heat exchanger E-0101 can be made smaller, which is convenient for system integration and makes the multifunctional hydrogen production circulation system more concise and flexible.

[0026] By connecting to the oxygen-water primary separation tank V-0102 through an anti-disturbance mixing pipeline, it can effectively mix and avoid turbulence caused by the different water temperatures of the deionization circulation loop and the electrolytic cell circulation loop, thereby improving the uniformity of the return water temperature.

[0027] Furthermore, the water replenishment circuit includes a pure water tank V-0101 and a water replenishment pump P-0101, the pure water tank V-0101 is provided with a deionized water input pipeline, and the pure water tank V-0101 is connected between the heat exchanger E-0101 and the deionization circulation pump P-0102 through the water replenishment pump P-0101.

[0028] By setting up the pure water tank V-0101, a short-term water supply guarantee is provided for the system. When the external water supply is interrupted, the system operation will not be affected, thus ensuring the stable operation of the PEM electrolyzer PK-0201.

[0029] Furthermore, the cathode water outlet of the PEM electrolyzer PK-0201 is connected to the pure water tank V-0101 through a hydrogen primary liquid separation tank.

[0030] The present application recovers the deionized high-temperature water dragged from the anode of the PEM electrolyzer PK-0201 due to concentration difference, pressure difference and electroosmosis, thereby saving the water consumption of the system; because the recovered water is the high-temperature water flowing out of the PEM electrolyzer PK-0201, the waste heat of the PEM electrolyzer PK-0201 is efficiently utilized, reducing the need for additional heating, thereby reducing the operating energy consumption of the system; by intelligently adjusting the working states of the electric heater H-0101 and the heat exchanger E-0101, the energy consumption at non-high load is reduced, and the energy consumption of the entire system is optimized.

[0031] See also Figure 2 The present application also provides a control method for a multifunctional hydrogen production cycle system, which comprises: When the multifunctional hydrogen production cycle system is in operation, the conductivity of the oxygen-water primary liquid separation tank V-0102 is obtained to determine whether the conductivity of the oxygen-water primary liquid separation tank V-0102 is greater than or equal to a first threshold value S1; When the conductivity of the oxygen-water primary separation tank V-0102 is less than the first threshold value S1, the electrolytic cell circulation loop is started; When the conductivity of the oxygen-water primary liquid separation tank V-0102 is greater than or equal to the first threshold value S1, a first delay time is set to determine whether the conductivity of the oxygen-water primary liquid separation tank V-0102 is greater than or equal to the second threshold value S2, and the second threshold value S2 is greater than the first threshold value S1; When the conductivity of the oxygen-water primary liquid separation tank V-0102 is greater than or equal to the second threshold value S2, the electrolytic cell circulation loop is closed, and it is continued to be determined whether the conductivity of the oxygen-water primary liquid separation tank V-0102 is greater than or equal to the first threshold value S1; When the conductivity of the oxygen-water primary liquid separation tank V-0102 is less than the second threshold value S2, it is determined whether the conductivity of the oxygen-water primary liquid separation tank V-0102 is greater than or equal to a third threshold value S3, and the third threshold value S3 is greater than the second threshold value S2; When the conductivity of the oxygen-water primary liquid separation tank V-0102 is greater than a third threshold value S3, the multifunctional hydrogen production circulation system is shut down after a second delay time is set; When the conductivity of the oxygen-water primary separation tank V-0102 is less than or equal to the third threshold value S3, the deionization circulation loop is set to run at the maximum flow rate, and it is continued to be determined whether the conductivity of the oxygen-water primary separation tank V-0102 is greater than or equal to the first threshold value S1.

[0032] In this embodiment, conductivity sensors are arranged at the circulating water inlet (AT-0101) and outlet (AT-0102). By collecting real-time conductivity data C1 and C2 and comparing them with the set values ​​S0 (0.055 μS / cm), S1 (0.2 μS / cm), set value S2 (0.2~0.9 μS / cm), and set value S3 (0.9 μS / cm), water quality regulation and fault warning are achieved. Liquid level sensors (LT-0101 / 0102) are arranged on the pure water storage tank and the oxygen water primary separation tank. By collecting real-time water volume data V1, it participates in the calculation and judgment of the system. Flow sensors FT0101 / 0102 are arranged on the double circulation loop. By collecting real-time water flow Q1 and Q2, the power of the pump is changed to achieve the function of regulating the water volume.

[0033] Furthermore, the control method of the multifunctional hydrogen production cycle system also includes: Determine whether the first delay time is over, if not, continue to determine whether the conductivity of the oxygen-water primary liquid separation tank V-0102 is greater than or equal to the first threshold value S1, if so, determine whether the conductivity of the oxygen-water primary liquid separation tank V-0102 is greater than or equal to the second threshold value S2; Determine whether the second delay time has ended, if so, shut down the multifunctional hydrogen production circulation system, if not, continue to determine whether the conductivity of the oxygen-water primary separation tank V-0102 is greater than the third threshold value S3.

[0034] Furthermore, the control method of the multifunctional hydrogen production cycle system also includes: When the conductivity of the oxygen-water primary separation tank V-0102 is less than the first threshold value S1, the deionization circulation loop is set to calculate the amount of circulating water passing through the deionizer X-0101 according to the flow limit of the deionization circulation pump P-0102 and the electrolytic cell circulation pump P-0103; When the conductivity of the oxygen-water primary separation tank V-0102 is greater than or equal to the first threshold value S1, Calculate the first delay time t, where Q is the circulating water volume through the deionizer X-0101 (t / h), V is the water storage volume of the system (m³), is the deionizer efficiency (%), and C(t) is the conductivity of the oxygen-water primary separation tank V-0102 at different times (μS / cm).

[0035] See also Figure 3 , the control method of the multifunctional hydrogen production cycle system further includes: When the multifunctional hydrogen production cycle system is in operation, obtain the real-time temperature value T1 of the oxygen-water primary liquid separation tank V-0102, obtain the real-time temperature value T2 of the output end of the heat exchanger E-0101, obtain the set key temperature threshold value T3 of the key regulating valve TV-0501 of the heat exchanger E-0101, and judge whether the real-time temperature value T1 of the heat exchanger E-0101 is greater than the set key temperature threshold value T3 of the key regulating valve TV-0501 of the heat exchanger E-0101; When the real-time temperature value T1 of the heat exchanger E-0101 is greater than the set key temperature threshold value T3 of the key regulating valve TV-0501 of the heat exchanger E-0101, the electric heater H-0101 is turned off; When the real-time temperature value T1 of the heat exchanger E-0101 is less than or equal to the set key temperature threshold value T3 of the key regulating valve TV-0501 of the heat exchanger E-0101, it is determined whether there is flow in the deionization circulation loop; If there is no flow in the deionization circulation loop, the multifunctional hydrogen production circulation system is shut down after a third delay period. If there is flow in the deionization circulation loop, the electric heater H-0101 is turned on and the real-time temperature value T1 of the heat exchanger E-0101 is adjusted to the set key temperature threshold T3 of the key regulating valve TV-0501 of the heat exchanger E-0101.

[0036] Further, when the real-time temperature value T1 of the heat exchanger E-0101 is greater than the set key temperature threshold value T3 of the key regulating valve TV-0501 of the heat exchanger E-0101, after turning off the electric heater H-0101, it also includes: Obtain the heat generation Qnet of the PEM electrolyzer PK-0201 and the heat exchange Qexc of the deionization circulation loop; When the heat generation Qnet of the PEM electrolyzer PK-0201 is greater than the heat exchange Qexc of the deionization circulation loop, the real-time temperature value T2 of the output end of the heat exchanger E-0101 is set to the set temperature threshold T4, wherein the set temperature threshold T4 is greater than the set key temperature threshold T3; according to the real-time temperature value T1 of the heat exchanger E-0101 and the set temperature threshold T4, the opening of the key regulating valve TV-0501 of the heat exchanger E-0101 is adjusted by the proportional-integral-differential algorithm; When the heat generation Qnet of the PEM electrolyzer PK-0201 is less than the heat exchange Qexc of the deionization circulation loop, the opening of the key regulating valve TV-0501 of the heat exchanger E-0101 is adjusted by the proportional-integral-differential algorithm according to the real-time temperature value T1 of the heat exchanger E-0101 and the set key temperature threshold T3.

[0037] Further, the heat generation of the PEM electrolyzer PK-0201 and the heat exchange amount Qexc of the deionization circulation loop are obtained, including: pass Calculate the calorific value of the PEM electrolyzer PK-0201, where Istack is the total current (A) of the PEM electrolyzer PK-0201, and Acell is the reaction area (cm 2 ), Ncell is the number of electrolytic cell sections (sheets) of the PEM electrolytic cell PK-0201, Vcell is the voltage (V) of the PEM electrolytic cell PK-0201, and Vth is the electrolysis voltage (1.48V) of the PEM electrolytic cell PK-0201; pass Calculate the heat dissipation of the PEM electrolyzer PK-0201, where h is the thermal conductivity (thermal conductivity of the material, in W / m·K), Tstack is the stack temperature (the operating temperature of the electrolyzer, in °C), and Tamb is the ambient temperature (external air temperature, in °C); pass Calculate the heat generation Qnet of the PEM electrolyzer PK-0201; pass The heat exchange capacity Qexc of the deionization circulation loop is calculated, where C is the specific heat capacity of water (J / (kg·℃), m is the mass of water (kg), and Δt is the temperature difference (℃).

[0038] Furthermore, the opening of the key regulating valve TV-0501 of the heat exchanger E-0101 is adjusted by the proportional-integral-differential algorithm, including: The proportional-integral-differential algorithm is ; Wherein, Kp, Ki, Kd are respectively the proportional gain coefficient, the integral gain coefficient and the differential gain coefficient, and e(t) is the deviation between the set temperature and the actual temperature; when the heat generation Qnet of the PEM electrolyzer PK-0201 is greater than the heat exchange Qexc of the deionization circulation loop, e(t)=T4-T2; when the heat generation Qnet of the PEM electrolyzer PK-0201 is less than the heat exchange Qexc of the deionization circulation loop, e(t)=T3-T2.

[0039] Furthermore, the control method of the multifunctional hydrogen production cycle system also includes: When the multifunctional hydrogen production circulation system is in operation, the flow rate of the PEM electrolyzer PK-0201 and the flow rate of the deionization circulation loop are obtained, and the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer PK-0201 is calculated; Obtain the relationship between the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer PK-0201 and the temperature of the deionization circulation loop, and adjust the temperature of the deionization circulation loop based on the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer PK-0201.

[0040] Among them, the relationship between the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer PK-0201 and the temperature of the deionization circulation loop is shown in Table 1.

[0041] Table 1 Relationship between the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer PK-0201 and the temperature of the deionization circulation loop Serial number Flow ratio Deionization loop temperature 1 0.05 37.4812474 2 0.055 41.6407959 3 0.06 45.1024583 4 0.065 48.0156113 5 0.07 50.5088256 6 0.075 52.6666075 7 0.08 54.5381244 8 0.085 56.1916681 9 0.09 57.6599448 10 0.095 58.970302 11 0.1 60.1486066 12 0.105 61.212153 13 0.11 62.1775874 14 0.115 63.0590763 15 0.12 63.8653963 16 0.125 64.6068721 17 0.13 65.2903739 18 0.135 65.9229599 19 0.14 66.5094738 20 0.145 67.0552697 21 0.15 67.5644101 22 0.155 68.0402497 23 0.16 68.4861648 24 0.165 68.9047052 25 0.17 69.2985553 26 0.175 69.6694557 27 0.18 70.0197447 28 0.185 70.3508365 29 0.19 70.6643827 30 0.195 70.9617575 31 0.2 71.2441072 32 0.205 71.5125227 33 0.21 71.7682161 34 0.215 72.0118005 35 0.22 72.2442906 36 0.225 72.466348 37 0.23 72.6787005 38 0.235 72.8819244 39 0.24 73.0766687 40 0.245 73.263369 41 0.25 73.4425656 42 0.255 73.6146967 43 0.26 73.7801614 44 0.265 73.9393519 45 0.27 74.0925978 46 0.275 74.2402419 47 0.28 74.385451 48 0.285 74.521006 49 0.29 74.6535672 50 0.295 74.7816006 51 0.3 74.9053378 It can be seen from the above table that when the electrolytic cell is running at full load, in order to ensure that the electrolytic cell operates at the set temperature, the deionization flow ratio must meet the above table, and an appropriate value must be set within the ratio range for control.

[0042] Among them, the cooling capacity of the system is accurately adjusted by controlling the proportional valve on the cold water side, thereby controlling the temperature of the entire system; the temperature measuring point is installed inside the tank to make the control more stable and the fluctuation smaller; the conductivity measuring point is installed inside the tank to make the conductivity more stable and the fluctuation smaller; the system monitors the conductivity of deionized water in real time, and through precise measurement and compensation formulas, it ensures that the conductivity fluctuation is minimized and the water quality is stable during the operation of the electrolyzer; when the conductivity abnormality occurs again, the flow of the deionization circulation pump is automatically adjusted to respond quickly to avoid the system conductivity not meeting the standard and affecting the hydrogen production efficiency.

[0043] The multifunctional hydrogen production circulation system and control method provided in the embodiment of the present application are provided with a water replenishment circuit, a deionization circulation circuit and an electrolyzer circulation circuit. The connection position of the deionization circulation circuit and the electrolyzer circulation circuit is located before the oxygen-water primary liquid separation tank V-0102, and is connected to the oxygen-water primary liquid separation tank V-0102 through an anti-disturbance mixing pipeline. It can effectively mix and avoid the turbulence phenomenon caused by the different water temperatures of the deionization circulation circuit and the electrolyzer circulation circuit, and utilize the water replenishment circuit and the deionization circulation circuit to effectively control the conductivity of the inlet water and stably control the conductivity and temperature of the pure water entering the electrolyzer.

[0044] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0045] The above is a detailed introduction to a multifunctional hydrogen production cycle system and a control method thereof provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A multifunctional hydrogen production cycle system, characterized in that: It includes a water replenishment loop, a deionization circulation loop and an electrolytic cell circulation loop; The deionization circulation loop is a deionization circulation pump, a heat exchanger, a deionizer, an electric heater, an oxygen-water primary separation tank, and the deionization circulation pump connected in a ring shape; The electrolytic cell circulation loop is an electrolytic cell circulation pump, a PEM electrolytic cell, the oxygen-water primary separation tank, and an electrolytic cell circulation pump connected in a ring shape; The access point of the water replenishment loop is located between the heat exchanger and the deionization circulation pump; The output end of the electric heater and the anode water outlet of the PEM electrolyzer are combined into one path and connected to the oxygen-water primary liquid separation tank through an anti-turbulence mixing pipeline.

2. The multifunctional hydrogen production cycle system according to claim 1, characterized in that: The water replenishment loop includes a pure water tank and a water replenishment pump. The pure water tank is provided with a deionized water input pipeline. The pure water tank is connected between the heat exchanger and the deionization circulation pump through the water replenishment pump.

3. The multifunctional hydrogen production cycle system according to claim 2, characterized in that: The cathode water outlet of the PEM electrolyzer is connected to the pure water tank through a hydrogen primary liquid separation tank.

4. A control method for the multifunctional hydrogen production cycle system according to claims 1 to 3, characterized in that: include: When the multifunctional hydrogen production cycle system is in operation, the conductivity of the oxygen-water primary liquid separation tank is obtained to determine whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to a first threshold value S1; When the conductivity of the oxygen-water primary separation tank is less than a first threshold value S1, the electrolytic cell circulation loop is started; When the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the first threshold value S1, a first delay time is set to determine whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the second threshold value S2, and the second threshold value S2 is greater than the first threshold value S1; When the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the second threshold value S2, the electrolytic cell circulation loop is closed, and it is continued to be determined whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the first threshold value S1; When the conductivity of the oxygen-water primary liquid separation tank is less than the second threshold value S2, it is determined whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to a third threshold value S3, and the third threshold value S3 is greater than the second threshold value S2; When the conductivity of the oxygen-water primary liquid separation tank is greater than a third threshold value S3, the multifunctional hydrogen production circulation system is shut down after a second delay time is set; When the conductivity of the oxygen-water primary liquid separation tank is less than or equal to the third threshold value S3, the deionization circulation loop is set to run at the maximum flow rate, and it is continued to be determined whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the first threshold value S1.

5. The control method of the multifunctional hydrogen production cycle system according to claim 4, characterized in that: Also includes: Determine whether the first delay time has ended, if not, continue to determine whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the first threshold value S1, if so, determine whether the conductivity of the oxygen-water primary liquid separation tank is greater than or equal to the second threshold value S2; It is determined whether the second delay time has ended, if so, the multifunctional hydrogen production circulation system is turned off, if not, it is continued to determine whether the conductivity of the oxygen-water primary separation tank is greater than a third threshold value S3.

6. The control method of the multifunctional hydrogen production cycle system according to claim 4, characterized in that: Also includes: When the conductivity of the oxygen-water primary separation tank is less than a first threshold value S1, the deionization circulation loop is set to calculate the amount of circulating water passing through the deionizer according to the flow limit of the deionization circulation pump and the electrolytic cell circulation pump; When the conductivity of the oxygen-water primary separation tank is greater than or equal to the first threshold value S1, Calculate the first delay time t, where Q is the amount of circulating water passing through the deionizer, and V is the amount of water stored in the system. is the deionizer efficiency, and C(t) is the conductivity of the oxygen-water primary separation tank at different times.

7. The control method of the multifunctional hydrogen production cycle system according to claim 4, characterized in that: Also includes: When the multifunctional hydrogen production cycle system is in operation, the real-time temperature value T1 of the oxygen-water primary liquid separation tank is obtained, the real-time temperature value T2 of the output end of the heat exchanger is obtained, and the set key temperature threshold value T3 of the key regulating valve of the heat exchanger is obtained, and it is determined whether the real-time temperature value T1 of the heat exchanger is greater than the set key temperature threshold value T3 of the key regulating valve of the heat exchanger; When the real-time temperature value T1 of the heat exchanger is greater than the set key temperature threshold value T3 of the key regulating valve of the heat exchanger, the electric heater is turned off; When the real-time temperature value T1 of the heat exchanger is less than or equal to the set key temperature threshold value T3 of the key regulating valve of the heat exchanger, it is determined whether there is flow in the deionization circulation loop; If there is no flow in the deionization circulation loop, the multifunctional hydrogen production circulation system is shut down after a third delay period. If there is flow in the deionization circulation loop, the electric heater is turned on and the real-time temperature value T1 of the heat exchanger is adjusted to the set key temperature threshold T3 of the key regulating valve of the heat exchanger.

8. The control method of the multifunctional hydrogen production cycle system according to claim 7, characterized in that: When the real-time temperature value T1 of the heat exchanger is greater than the set key temperature threshold value T3 of the key regulating valve of the heat exchanger, after turning off the electric heater, the method further includes: Obtaining the heat generation Qnet of the PEM electrolyzer and the heat exchange Qexc of the deionization circulation loop; When the heat generation Qnet of the PEM electrolyzer is greater than the heat exchange Qexc of the deionization circulation loop, the real-time temperature value T2 at the output end of the heat exchanger is set to the set temperature threshold T4, wherein the set temperature threshold T4 is greater than the set key temperature threshold T3; according to the real-time temperature value T1 of the heat exchanger and the set temperature threshold T4, the opening of the key regulating valve of the heat exchanger is adjusted by a proportional-integral-differential algorithm; When the heat generation Qnet of the PEM electrolyzer is less than the heat exchange Qexc of the deionization circulation loop, the opening of the key regulating valve of the heat exchanger is adjusted by a proportional-integral-differential algorithm according to the real-time temperature value T1 of the heat exchanger and the set key temperature threshold T3.

9. The control method of the multifunctional hydrogen production cycle system according to claim 8, characterized in that: The step of obtaining the heat generated by the PEM electrolyzer and the heat exchange amount Qexc of the deionization circulation loop comprises: pass Calculate the calorific value of the PEM electrolyzer, where Istack is the total current of the PEM electrolyzer, Acell is the reaction area of ​​the PEM electrolyzer, Ncell is the number of electrolyzer sections of the PEM electrolyzer, Vcell is the voltage of the PEM electrolyzer, and Vth is the electrolysis voltage of the PEM electrolyzer; pass Calculate the heat dissipation of the PEM electrolyzer, where h is the thermal conductivity, Tstack is the stack temperature, and Tamb is the ambient temperature; pass Calculate the heat generation Qnet of the PEM electrolyzer; pass The heat exchange capacity Qexc of the deionization circulation loop is calculated, where C is the specific heat capacity of water, m is the mass of water, and Δt is the temperature difference.

10. The control method of the multifunctional hydrogen production cycle system according to claim 8, characterized in that: The method of adjusting the opening of the key regulating valve of the heat exchanger by using the proportional-integral-differential algorithm includes: The proportional-integral-differential algorithm is ; Among them, Kp, Ki, Kd are the proportional gain coefficient, integral gain coefficient and differential gain coefficient respectively, and e(t) is the deviation between the set temperature and the actual temperature.

11. The control method of the multifunctional hydrogen production cycle system according to claim 4, characterized in that: Also includes: When the multifunctional hydrogen production circulation system is in operation, obtaining the flow rate of the PEM electrolyzer and the flow rate of the deionization circulation loop, and calculating the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer; The relationship between the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer and the temperature of the deionization circulation loop is obtained, and the temperature of the deionization circulation loop is adjusted based on the ratio of the flow rate of the deionization circulation loop to the flow rate of the PEM electrolyzer.

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