PEM water electrolysis hydrogen production integrated heat dissipation system and control method thereof

Abstract

The invention discloses a PEM water electrolysis hydrogen production integrated heat dissipation system and a control method thereof.The heat dissipation system comprises an electrolytic bath and a heat dissipation device, and the heat dissipation device comprises a first water pump, a second water pump, a radiator and a plate heat exchanger; the control method mainly comprises the steps that the heat dissipation requirement of an electrolytic cell is obtained, a heat dissipation system model is used for establishing the dynamic relation among the heat dissipation requirement, the first water pump rotating speed, the second water pump rotating speed, the radiator rotating speed and plate heat exchanger parameters, and the heat dissipation requirement is matched with the heat dissipation capacity; according to the actual rotating speed of the first water pump, the actual rotating speed of the second water pump, the actual rotating speed of the radiator and the actual parameters of the plate heat exchanger, auxiliary engine power consumption of the radiator is obtained; and when the auxiliary engine power consumption is the minimum value, outputting the auxiliary engine power consumption and the operation parameters of the heat dissipation device. Therefore, the heat exchange efficiency is effectively improved, the optimal configuration of the heat dissipation system is realized by positively setting the operation parameters of the heat dissipation device, and the operation power consumption is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and particularly to a PEM electrolytic water hydrogen production integrated heat dissipation system and a control method thereof. Background Art

[0002] In the prior art, the heat dissipation system for PEM electrolytic water hydrogen production usually consists of a water pump, a heat exchanger, a chiller, etc. A finished chiller is used as the cold source, and the chiller integrates a water pump, a heat exchanger, and a fan. That is to say, two series-connected heat exchangers, two groups of water pumps, and one group of radiators are integrated. The existing heat dissipation system has a complex structure, high cost, large layout space occupation, and high auxiliary machine power consumption, which is not conducive to reducing the energy consumption of the whole system. Especially, the configuration of the existing heat dissipation system is not associated with the actual heat dissipation requirements of the electrolytic cell, resulting in the heat transfer efficiency not reaching the optimum. Summary of the Invention

[0003] Aiming at the above deficiencies, the technical problem to be solved by the present invention is: to provide a PEM electrolytic water hydrogen production integrated heat dissipation system and a control method thereof, which effectively improve the heat transfer efficiency, realize the optimal configuration of the heat dissipation system by setting the operating parameters of the heat dissipation device in a positive direction, effectively reduce the operating power consumption, and improve the economic efficiency and operating reliability.

[0004] To solve the above technical problem, the technical solution of the present invention is:

[0005] A control method for a PEM electrolytic water hydrogen production integrated heat dissipation system, the integrated heat dissipation system includes an electrolytic cell and a heat dissipation device, and the heat dissipation device includes a first water pump, a second water pump, a radiator, and a plate heat exchanger; the control method includes the following steps:

[0006] S10. Obtain the operating parameters of the electrolytic cell;

[0007] S20. Obtain the heat dissipation requirement of the electrolytic cell according to the operating parameters of the electrolytic cell and a preset electrolytic cell thermal management model;

[0008] S30. Use a preset heat dissipation system model to establish a dynamic relationship among the heat dissipation requirement of the electrolytic cell, the rotation speed of the first water pump, the rotation speed of the second water pump, the rotation speed of the radiator, and the parameters of the plate heat exchanger, so that the heat dissipation capacity of the heat dissipation device matches the heat dissipation requirement of the electrolytic cell;

[0009] S40. The heat dissipation system model then obtains the auxiliary machine power consumption of the heat dissipation device according to the actual rotation speed of the first water pump, the actual rotation speed of the second water pump, the actual rotation speed of the radiator, and the actual parameters of the plate heat exchanger;

[0010] S50. Judge whether the auxiliary machine power consumption is the minimum value;

[0011] S60. If the power consumption of the auxiliary machine is at the minimum value, output the power consumption of the auxiliary machine, the actual speed of the first water pump, the actual speed of the second water pump, the actual speed of the radiator, and the actual parameters of the plate heat exchanger.

[0012] Preferably, the heat dissipation requirement is the coolant flow rate at the anode outlet of the electrolytic cell; the control method further includes the following steps:

[0013] S25. Obtain the actual temperature of the electrolytic cell according to the coolant flow rate.

[0014] S26. Determine whether the actual temperature of the electrolytic cell is within the preset target temperature range.

[0015] S27. If the actual temperature of the electrolytic cell is within the target temperature range;

[0016] S28. Output the actual temperature of the electrolytic cell.

[0017] Preferably, the anode outlet of the electrolytic cell is connected to the hot end inlet of the plate heat exchanger through the first water pump, the cold end outlet of the plate heat exchanger is connected to the inlet of the radiator, the outlet of the radiator is connected to the cold end inlet of the plate heat exchanger through the second water pump, and the hot end outlet of the plate heat exchanger is connected to the anode inlet of the electrolytic cell;

[0018] S27 further includes:

[0019] If the actual temperature of the electrolytic cell is not within the target temperature range, dynamically adjust the radiator speed, the first water pump speed, and the actual temperature of the electrolytic cell using PID, and then execute S26.

[0020] Preferably, the power consumption of the auxiliary machine includes the actual power of the first water pump and the time power of the second water pump;

[0021] S40 includes:

[0022] S400. The heat dissipation system model includes a linear function relationship between the water pump speed and the flow rate: where n w,0 is the rated speed of the water pump, q w,0 is the rated flow rate of the water pump, n w,1 is the actual speed of the water pump, q w,1 is the actual flow rate of the water pump;

[0023] S401. Input the actual speed of the first water pump into the linear function relationship between the water pump speed and the flow rate, and calculate the actual flow rate of the first water pump;

[0024] Input the actual speed of the second water pump into the linear function relationship between the water pump speed and the flow rate, and calculate the actual flow rate of the second water pump;

[0025] S402. Obtain the corresponding actual power of the first water pump from the preset water pump flow - speed - power diagram according to the actual flow rate and actual speed of the first water pump;

[0026] Obtain the corresponding actual power of the second water pump from the preset water pump flow - speed - power diagram according to the actual flow rate and actual speed of the second water pump.

[0027] Preferably, the radiator is a fan, and the auxiliary machine power consumption includes the actual power of the fan;

[0028] The S40 includes:

[0029] S403. The heat dissipation system model includes a linear function relationship between the fan speed and the flow rate: where n f,0 is the rated speed of the fan, q f,0 is the rated flow rate of the fan, n f,1 is the actual speed of the fan, q f,1 is the actual flow rate of the fan;

[0030] S404. Input the actual speed of the fan into the linear function relationship between the fan speed and the flow rate to calculate the actual flow rate of the fan;

[0031] S405. Obtain the corresponding actual power of the fan from the preset fan flow - speed - power diagram according to the actual flow rate and actual speed of the fan.

[0032] Preferably, according to the law of conservation of energy, establish an electrolytic cell thermal management model, and use the electrolytic cell thermal management model to obtain the heat dissipation requirements of different electrolytic cells;

[0033] The electrolytic cell thermal management model includes the following formula:

[0034] Q el =(U ell -V th )I el n cell ;

[0035]

[0036] where Q el is the heat dissipation of the electrolytic cell, U ell is the measured voltage of a single cell of the electrolytic cell, I el is the total direct current of the electrolytic cell, n cell is the number of single cells of the electrolytic cell, V th is the theoretical voltage of a single cell of the electrolytic cell, T stack is the temperature of the electrolytic cell, C stack is the specific heat capacity of the electrolytic cell, T in,PEM is the anode outlet temperature of the electrolytic cell, qcl is the coolant flow rate through the electrolyzer, Q gas is the heat dissipation by radiation.

[0037] Preferably, the heat dissipation system model includes a radiator model, and the radiator model includes the following formula:

[0038] Q cl = Q el = A rad K rad (T rad - T atm );

[0039]

[0040] where Q cl is the heat dissipation of the radiator, A rad is the heat transfer area of the radiator, K rad is the heat transfer coefficient of the radiator, T rad is the heat transfer temperature of the radiator, T atm is the ambient temperature, T rad,in is the inlet temperature of the radiator, T rad,out is the outlet temperature of the radiator.

[0041] A PEM electrolytic water hydrogen production integrated heat dissipation system includes a controller, an electrolyzer, a heat dissipation device, a heat dissipation demand calculation unit, a heat dissipation capacity calculation unit, and an auxiliary machine power consumption calculation unit; the heat dissipation device includes a first water pump, a second water pump, a radiator, and a plate heat exchanger. The cold end outlet of the plate heat exchanger is connected to the inlet of the radiator, the outlet of the radiator is connected to the cold end inlet of the plate heat exchanger through the second water pump, and the hot end outlet of the plate heat exchanger is connected to the anode inlet of the electrolyzer; a first temperature sensor is provided at the anode outlet of the electrolyzer; a second temperature sensor is provided at the cold end outlet of the plate heat exchanger; a third temperature sensor is provided at the cold end inlet of the plate heat exchanger; the controller is electrically connected to the first water pump, the second water pump, the radiator, the first temperature sensor, the second temperature sensor, and the third temperature sensor respectively;

[0042] The heat dissipation demand calculation unit is used to calculate the heat dissipation demand of the electrolyzer according to the operating parameters of the electrolyzer by using a preset electrolyzer thermal management model, and transmit a corresponding heat dissipation demand signal to the controller;

[0043] The heat dissipation capacity calculation unit is used to establish a dynamic relationship among the heat dissipation demand of the electrolyzer, the rotation speed of the first water pump, the rotation speed of the second water pump, the rotation speed of the radiator, and the parameters of the plate heat exchanger by using a preset heat dissipation system model, so that the heat dissipation capacity of the heat dissipation device matches the heat dissipation demand of the electrolyzer;

[0044] The auxiliary power consumption calculation unit is configured to calculate the auxiliary power consumption according to the actual rotational speed of the first water pump, the actual rotational speed of the second water pump, and the actual rotational speed of the radiator, and transmit the actual rotational speed of the first water pump, the actual rotational speed of the second water pump, and the actual rotational speed of the radiator to the controller when the auxiliary power consumption is at a minimum value.

[0045] Preferably, the system further includes a PID control unit, which is electrically connected to the controller. The PID control unit dynamically adjusts the rotational speed of the first water pump, the rotational speed of the radiator, and the temperature of the electrolytic cell by using PID to keep the temperature of the electrolytic cell within the target temperature range.

[0046] Preferably, the system further includes a preset unit, which is configured to preset an electrolytic cell thermal management model and a heat dissipation system model.

[0047] After adopting the above technical solutions, the beneficial effects of the present invention are as follows:

[0048] Since the PEM electrolytic water hydrogen production integrated heat dissipation system and its control method of the present invention, the integrated heat dissipation system includes an electrolytic cell and a heat dissipation device, and the heat dissipation device includes a first water pump, a second water pump, a radiator, and a plate heat exchanger; the control method mainly obtains the operating parameters of the electrolytic cell; according to the operating parameters of the electrolytic cell and the preset electrolytic cell thermal management model, obtains the heat dissipation requirement of the electrolytic cell; uses the heat dissipation system model to establish the dynamic relationship between the heat dissipation requirement, the rotational speed of the first water pump, the rotational speed of the second water pump, the rotational speed of the radiator, and the parameters of the plate heat exchanger, so that the heat dissipation capacity of the heat dissipation device matches the heat dissipation requirement of the electrolytic cell, and then according to the actual rotational speed of the first water pump, the actual rotational speed of the second water pump, the actual rotational speed of the radiator, and the actual parameters of the plate heat exchanger, obtains the auxiliary power consumption of the heat dissipation device; when the auxiliary power consumption is at a minimum value, outputs the auxiliary power consumption, the actual rotational speed of the first water pump, the actual rotational speed of the second water pump, the actual rotational speed of the radiator, and the actual parameters of the plate heat exchanger to confirm the optimal heat dissipation system configuration. It can be seen that the integrated heat dissipation system of the present invention effectively improves the heat exchange efficiency, and by matching the heat dissipation requirement of the electrolytic cell with the heat dissipation capacity of the heat dissipation device, positively configures the operating parameters of the heat dissipation device, realizes the optimal configuration of the heat dissipation system, effectively reduces the operating power consumption of the PEM electrolytic water hydrogen production system, and effectively improves the economic efficiency and operating reliability of the PEM electrolytic hydrogen production system. Description of the Drawings

[0049] Figure 1 is a flowchart of the control method of the PEM electrolytic water hydrogen production integrated heat dissipation system in the present invention;

[0050] Figure 2 is a schematic diagram of the PEM electrolytic water hydrogen production integrated heat dissipation system in the present invention;

[0051] In the figure: 1 - electrolytic cell, 2 - first water pump, 3 - second water pump, 4 - plate heat exchanger, 5 - radiator, 6 - first temperature sensor, 7 - second temperature sensor, 8 - third temperature sensor. Detailed implementation mode

[0052] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0054] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Embodiment 1:

[0056] A control method for a PEM electrolytic water hydrogen production integrated heat dissipation system, wherein the PEM electrolytic water hydrogen production integrated heat dissipation system includes an electrolytic cell 1 and a heat dissipation device. The heat dissipation device includes a first water pump 2, a second water pump 3, a radiator 5 and a plate heat exchanger 4. Refer to Figure 2 , the anode outlet of the electrolytic cell 1 is connected to the hot end inlet of the plate heat exchanger 4 through the first water pump 2. The cold end outlet of the plate heat exchanger 4 is connected to the inlet of the radiator 5. The outlet of the radiator 5 is connected to the cold end inlet of the plate heat exchanger 4 through the second water pump 3. The hot end outlet of the plate heat exchanger 4 is connected to the anode inlet of the electrolytic cell 1; a first temperature sensor 6 is arranged at the anode outlet of the electrolytic cell 1; a second temperature sensor 7 is arranged at the cold end outlet of the plate heat exchanger 4; a third temperature sensor 8 is arranged at the cold end inlet of the plate heat exchanger 4. In this embodiment, the radiator 5 is a fan.

[0057] As Figure 1 shown, the control method for the PEM electrolytic water hydrogen production integrated heat dissipation system of the present invention includes the following steps:

[0058] Step S10: Obtain the operating parameters of the electrolytic cell; the operating parameters may include the current I, voltage U, target temperature of the electrolytic cell, and the coolant temperature at the outlet of the electrolytic cell, and the coolant temperature can be detected by the first temperature sensor.

[0059] Step S20: According to the operating parameters of the electrolytic cell and the preset electrolytic cell thermal management model, obtain the heat dissipation requirement of the electrolytic cell; in this embodiment, the heat dissipation requirement refers to the coolant flow rate flowing through the electrolytic cell.

[0060] Step S30: Utilize the preset heat dissipation system model to establish the dynamic relationship among the electrolytic cell heat dissipation requirement, the rotational speed of the first water pump, the rotational speed of the second water pump, the rotational speed of the radiator, and the plate heat exchanger parameters, so that the heat dissipation capacity of the heat dissipation device matches the electrolytic cell heat dissipation requirement;

[0061] Step S40: The heat dissipation system model then obtains the auxiliary machine power consumption of the heat dissipation device according to the actual rotational speed of the first water pump, the actual rotational speed of the second water pump, the actual rotational speed of the radiator, and the actual parameters of the plate heat exchanger.

[0062] Step S50: Determine whether the auxiliary machine power consumption is the minimum value;

[0063] Step S60: If the auxiliary machine power consumption is the minimum value, output the auxiliary machine power consumption, the actual rotational speed of the first water pump, the actual rotational speed of the second water pump, the actual rotational speed of the radiator, and the actual parameters of the plate heat exchanger to confirm the optimal configuration of the integrated heat dissipation system.

[0064] For the control method of the integrated heat dissipation system for PEM electrolytic water hydrogen production of the present invention, the electrolytic cell thermal management model and the heat dissipation system model are established in advance. The operating parameters of the electrolytic cell are input into the electrolytic cell thermal management model to obtain the corresponding heat dissipation requirement. Then, the heat dissipation system model is used to establish the dynamic relationship between the heat dissipation requirement and each component in the heat dissipation device. By adjusting the operating parameters of the components such as the rotational speed, the heat dissipation capacity of the heat dissipation device is adjusted, and finally, the heat dissipation capacity matching the heat dissipation requirement is obtained. At the same time, using the actual operating parameters of each component in the heat dissipation device, the auxiliary machine power consumption of the heat dissipation device is obtained. During the process of matching the heat dissipation requirement and the heat dissipation capacity, when the auxiliary machine power consumption is the minimum, the time operating parameters of each component in the heat dissipation device are output to obtain the best heat dissipation device matching scheme, realizing forward design. It can be seen that after adopting the control method of the present invention, the heat exchange efficiency is effectively improved, and the operating parameters of the heat dissipation device are positively configured by matching the heat dissipation requirement of the electrolytic cell with the heat dissipation capacity of the heat dissipation device, realizing the optimal configuration of the heat dissipation system, effectively reducing the operating power consumption of the PEM electrolytic water hydrogen production system, and effectively improving the economic efficiency and operating reliability of the PEM electrolytic hydrogen production system.

[0065] As Figure 1 shown, the control method in this embodiment further includes the following steps:

[0066] Step S25: Obtain the actual temperature of the electrolytic cell according to the coolant flow rate;

[0067] Step S26: Determine whether the actual temperature of the electrolytic cell is within the preset target temperature range;

[0068] Step S27: If the actual temperature of the electrolytic cell is within the target temperature range;

[0069] If the actual temperature of the electrolytic cell is not within the target temperature range, use PID to dynamically adjust the radiator speed, the speed of the first water pump and the temperature of the electrolytic cell to make the actual temperature of the electrolytic cell within the target temperature range, and then execute Step S26.

[0070] Step S28: Output the actual temperature of the electrolytic cell.

[0071] The present invention utilizes the relationship between the dynamic adjustment of the radiator speed, the speed of the first water pump and the temperature of the electrolytic cell by PID to achieve the control of the target working temperature of the electrolytic cell, and avoid damaging the system efficiency and the membrane electrode due to excessive temperature.

[0072] Based on the heat dissipation system model, the present invention establishes a dynamic relationship between the parameters of the radiator, the heat exchanger and the water pump and the heat dissipation amount of the electrolytic cell, so as to adapt to the matching analysis and power prediction of the heat dissipation system required by the electrolytic cell, and achieve the forward design of the heat dissipation system.

[0073] In the present invention, the auxiliary power consumption of the heat dissipation system includes the actual power of the first water pump and the time power of the second water pump; Step S40 includes:

[0074] Step S400: The heat dissipation system model includes a linear function relationship between the water pump speed and the flow rate:

[0075]

[0076] where n w,0 is the rated speed of the water pump, L min -1 ;

[0077] q w,0 is the rated flow rate of the water pump, L min -1 ;

[0078] n w,1 is the actual speed of the water pump, rpm;

[0079] q w,1 is the actual flow rate of the water pump, L min -1 .

[0080] Step S401: Input the actual speed of the first water pump into the linear function relationship between the water pump speed and the flow rate, and calculate the actual flow rate of the first water pump;

[0081] Input the actual rotational speed of the second water pump into the linear function relationship between the water pump rotational speed and flow rate to calculate the actual flow rate of the second water pump;

[0082] Step S402: According to the actual flow rate and actual rotational speed of the first water pump, obtain the corresponding actual power of the first water pump from the preset water pump flow rate - rotational speed - power diagram;

[0083] According to the actual flow rate and actual rotational speed of the second water pump, obtain the corresponding actual power of the second water pump from the preset water pump flow rate - rotational speed - power diagram.

[0084] In the present invention, the auxiliary machine power consumption includes the actual power of the fan; Step S40 includes:

[0085] Step S403: The heat dissipation system model includes the linear function relationship between the fan rotational speed and flow rate:

[0086]

[0087] where n f,0 is the rated rotational speed of the fan, in rpm;

[0088] q f,0 is the rated flow rate of the fan, in L / min -1 ;

[0089] n f,1 is the actual rotational speed of the fan, in rpm;

[0090] q f,1 is the actual flow rate of the fan, in L / min -1 .

[0091] Step S404: Input the actual rotational speed of the fan into the linear function relationship between the fan rotational speed and flow rate to calculate the actual flow rate of the fan;

[0092] Step S405: According to the actual flow rate and actual rotational speed of the fan, obtain the corresponding actual power of the fan from the preset fan flow rate - rotational speed - power diagram.

[0093] In the present invention, according to the law of conservation of energy, an electrolytic cell thermal management model is established. The electrolytic cell thermal management model includes the following formula:

[0094] Q el =(U ell -V th )I el n cell ;

[0095]

[0096] where Q el is the heat dissipation of the electrolytic cell, in J;

[0097] U ell is the measured voltage of a single cell of the electrolyzer, with the unit of V;

[0098] I el is the total DC current of the electrolyzer, with the unit of A;

[0099] n cell is the number of single cells of the electrolyzer;

[0100] V th is the theoretical voltage of a single cell of the electrolyzer, with the unit of V;

[0101] T stack is the temperature of the electrolyzer, with the unit of K;

[0102] C staCk is the specific heat capacity of the electrolyzer, with the unit of K kg -1 K -1 ;

[0103] T in,PEM is the outlet temperature of the anode of the electrolyzer, with the unit of K;

[0104] q cl is the coolant flow rate through the electrolyzer, with the unit of kg s -1 ;

[0105] Q gas is the radiant heat dissipation.

[0106] In the present invention, the performance of the heat exchanger is reflected by the heat transfer coefficient and the heat transfer area, a radiator model is established, and the heat dissipation Q of the radiator is input cl , and the outlet temperature T of the radiator is obtained rad,out , and the radiator model includes the following formula:

[0107] Q cl =Q el =A rad K rad (T rad -T atm );

[0108]

[0109] where Q cl is the heat dissipation of the radiator, with the unit of J;

[0110] A rad is the heat transfer area of the radiator, with the unit of m 2 ;

[0111] K rad is the heat transfer coefficient of the radiator, W K m -2 ;

[0112] T rad is the heat exchange temperature of the radiator, with the unit of K;

[0113] T atm is the ambient temperature, with the unit of K;

[0114] T rad,in is the inlet temperature of the radiator, with the unit of K;

[0115] T rad,out is the outlet temperature of the radiator, with the unit of K.

[0116] In the present invention, based on the test data, a relational expression between the heat transfer coefficient K and the air volume q is established, thereby establishing the relationship between the heat dissipation of the fan and the fan speed;

[0117] The plate heat exchanger model includes the following formula, inputting the heat exchange quantity Q of the heat exchanger ex , the inlet and outlet temperatures and flow rates of the radiator, and the inlet and outlet temperatures and flow rates of the electrolytic cell.

[0118]

[0119] Q ex is the heat exchange quantity of the heat exchanger, with the unit of J;

[0120] A ex is the heat exchange area of the radiator, with the unit of m 2 ;

[0121] K ex is the heat transfer coefficient of the radiator, W K m -2 ;

[0122] ΔT ex is the heat exchange constant of the radiator.

[0123] The integrated heat dissipation system adopted in the present invention effectively improves the heat exchange efficiency, can perform heat exchange more efficiently during the heat dissipation process, and reduces energy loss; based on the established electrolytic cell thermal management model and heat dissipation system model, the heat dissipation requirements of the electrolytic cell and the heat dissipation capacity of the heat dissipation device are clarified. Based on this, the working parameter configuration of each component in the heat dissipation system is designed positively, so that the heat dissipation system can better adapt to the entire PEM electrolytic water hydrogen production system, and optimize the heat dissipation effect from the root of the system design. At the same time, the present invention also weights the optimal control method of the heat dissipation system, and uses PID to dynamically adjust the relationship between the radiator speed, the water pump speed and the electrolytic cell temperature. On the one hand, it can realize the control of the target working temperature of the electrolytic cell, avoid damage to the system efficiency and membrane electrode due to excessive temperature, and on the other hand, effectively reduce the operating power consumption of the PEM hydrogen production system.

[0124] In summary, the present invention not only reduces the operating power consumption of the heat dissipation system, but also realizes the optimization of the heat dissipation system configuration, which helps to plan energy use in advance, optimize the system operation cost, and enhance the hydrogen production economy.

[0125] Embodiment 2:

[0126] As Figure 2 shown, an integrated heat dissipation system for PEM electrolytic water hydrogen production can use the control method described in Embodiment 1. The heat dissipation system includes a controller, an electrolytic cell 1, a heat dissipation device, a heat dissipation demand calculation unit, a heat dissipation capacity calculation unit, an auxiliary power consumption calculation unit, a PID control unit, and a preset unit. The controller can be an FCU controller.

[0127] The heat dissipation device includes a first water pump 2, a second water pump 3, a radiator 5, and a plate heat exchanger 4. The cold-end outlet of the plate heat exchanger 4 is connected to the inlet of the radiator 5. The outlet of the radiator 5 is connected to the cold-end inlet of the plate heat exchanger 4 via the second water pump 3. The hot-end outlet of the plate heat exchanger 4 is connected to the anode inlet of the electrolytic cell 1. A first temperature sensor 6 is provided at the anode outlet of the electrolytic cell 1. A second temperature sensor 7 is provided at the cold-end outlet of the plate heat exchanger 4. A third temperature sensor 8 is provided at the cold-end inlet of the plate heat exchanger 4. The controller is electrically connected to the first water pump 2, the second water pump 3, the radiator 5, the first temperature sensor 6, the second temperature sensor 7, and the third temperature sensor 8 respectively. The first temperature sensor 6 is used to measure the temperature of the deionized water at the anode outlet of the electrolytic cell 1 and the inlet of the plate heat exchanger 4. The first water pump 2 is connected to the first temperature sensor 6 and is used to control the flow rate of the deionized water flowing through the electrolytic cell 1.

[0128] The heat dissipation demand calculation unit is used to calculate the heat dissipation demand of the electrolytic cell 1 according to the operating parameters of the electrolytic cell 1 by using a preset electrolytic cell heat management model, and can transmit a corresponding heat dissipation demand signal to the controller.

[0129] The heat dissipation capacity calculation unit is used to establish a dynamic relationship among the heat dissipation demand of the electrolytic cell, the rotational speed of the first water pump, the rotational speed of the second water pump, the rotational speed of the radiator, and the parameters of the plate heat exchanger by using a preset heat dissipation system model, so that the heat dissipation capacity of the heat dissipation device matches the heat dissipation demand of the electrolytic cell.

[0130] The auxiliary power consumption calculation unit is used to calculate the auxiliary power consumption according to the actual rotational speed of the first water pump, the actual rotational speed of the second water pump, and the actual rotational speed of the radiator, and when the auxiliary power consumption is at the minimum value, transmit the actual rotational speed of the first water pump, the actual rotational speed of the second water pump, and the actual rotational speed of the radiator to the controller to confirm the best configuration scheme of the heat dissipation system.

[0131] The PID control unit is electrically connected to the controller. The PID control unit uses PID to dynamically adjust the rotational speed of the first water pump, the rotational speed of the radiator, and the temperature of the electrolytic cell to make the temperature of the electrolytic cell within the target temperature range.

[0132] The preset unit is used to preset the electrolyzer thermal management model to enter the heat dissipation system model.

[0133] In the integrated heat dissipation system for PEM electrolytic water hydrogen production of the present invention, the integrated heat dissipation device used effectively improves the heat exchange efficiency and simplifies the layout of the heat dissipation system; among them, the heat dissipation demand calculation unit calculates the heat dissipation demand, that is, the coolant flow rate, according to the voltage, current and temperature of the electrolyzer 1, etc., using the electrolyzer thermal management model; the heat dissipation capacity calculation unit uses the heat dissipation system model to adjust the operating parameters of each component in the heat dissipation device so that the heat dissipation capacity of the heat dissipation device matches the heat dissipation demand; at the same time, the auxiliary machine power consumption calculation unit predicts the auxiliary machine power consumption of the heat dissipation device according to the actual operating parameters of the components, and when the auxiliary machine power consumption is the minimum value, outputs the auxiliary machine power consumption and the actual parameters of each component to confirm the best heat dissipation device matching scheme; it also uses PID to dynamically adjust the actual temperature of the electrolyzer to keep it within the target temperature range to avoid damage to the system efficiency and membrane electrode due to excessive temperature.

[0134] It can be seen that the integrated heat dissipation system for PEM electrolytic water hydrogen production of the present invention simplifies the layout of the heat dissipation system, improves the heat exchange efficiency of the system, and reduces the auxiliary machine power consumption of the heat dissipation system; based on the electrolyzer thermal management model and the heat dissipation system model, a matching scheme for the heat dissipation system is designed in a forward direction according to the heat dissipation demand of the electrolyzer, effectively reducing the auxiliary machine power consumption of the heat dissipation system; based on the electrolyzer thermal management model and the heat dissipation system model, the power consumption prediction of the PEM hydrogen production system and the efficient utilization of energy are realized, effectively optimizing the system operation cost and improving the overall economic efficiency.

[0135] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent improvements such as a PEM electrolytic water hydrogen production integrated heat dissipation system and its control method, etc., made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for an integrated heat dissipation system for producing hydrogen by PEM electrolysis of water, characterized in that: The integrated heat dissipation system comprises an electrolytic cell and a heat dissipation device, wherein the heat dissipation device comprises a first water pump, a second water pump, a radiator and a plate heat exchanger; the control method comprises the following steps: S10, obtaining electrolytic cell operating parameters; S20, obtaining the heat dissipation requirement of the electrolytic cell according to the electrolytic cell operation parameters and a preset electrolytic cell thermal management model; S30, using a preset heat dissipation system model, establishing a dynamic relationship among the heat dissipation demand of the electrolytic cell, the speed of the first water pump, the speed of the second water pump, the speed of the radiator, and the parameters of the plate heat exchanger, so that the heat dissipation capacity of the heat dissipation device matches the heat dissipation demand of the electrolytic cell; S40, the cooling system model obtains the auxiliary power consumption of the cooling device according to the actual rotation speed of the first water pump, the actual rotation speed of the second water pump, the actual rotation speed of the radiator and the actual parameters of the plate heat exchanger; S50, determining whether the auxiliary machine power consumption is a minimum value; S60: If the auxiliary machine power consumption is the minimum value, output the auxiliary machine power consumption, the actual speed of the first water pump, the actual speed of the second water pump, the actual speed of the radiator, and the actual parameters of the plate heat exchanger.

2. The control method of the integrated heat dissipation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: The heat dissipation requirement is the coolant flow rate at the anode outlet of the electrolytic cell; the control method further includes the following steps: S25, obtaining the actual temperature of the electrolytic cell according to the coolant flow rate; S26, determining whether the actual temperature of the electrolytic cell is within a preset target temperature range; S27, if the actual temperature of the electrolytic cell is within the target temperature range; S28. Output the actual temperature of the electrolytic cell.

3. The control method of the integrated heat dissipation system for producing hydrogen by PEM water electrolysis according to claim 2, characterized in that: The anode outlet of the electrolytic cell is connected to the hot end inlet of the plate heat exchanger via the first water pump, the cold end outlet of the plate heat exchanger is connected to the inlet of the radiator, the outlet of the radiator is connected to the cold end inlet of the plate heat exchanger via the second water pump, and the hot end outlet of the plate heat exchanger is connected to the anode inlet of the electrolytic cell; The S27 further includes: If the actual temperature of the electrolytic cell is not within the target temperature range, the PID is used to dynamically adjust the radiator speed, the first water pump speed and the actual temperature of the electrolytic cell, and then S26 is executed.

4. The control method of the integrated heat dissipation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: The auxiliary machine power consumption includes the actual power of the first water pump and the time power of the second water pump; The S40 includes: S400, cooling system model includes the linear function relationship between water pump speed and flow rate: Where n w,0 is the rated speed of the pump, q w,0 is the rated flow rate of the pump, n w,1 is the actual speed of the pump, q w,1 is the actual flow of the water pump; S401, inputting a linear function relationship between the actual speed of the first water pump and the speed and flow of the water pump to calculate the actual flow of the first water pump; Input the actual speed of the second water pump into a linear function relationship between the water pump speed and flow rate, and calculate the actual flow rate of the second water pump; S402, obtaining the corresponding actual power of the first water pump from a preset water pump flow-speed-power diagram according to the actual flow rate of the first water pump and the actual speed of the first water pump; According to the actual flow rate of the second water pump and the actual speed of the second water pump, the corresponding actual power of the second water pump is obtained from a preset water pump flow rate-speed-power diagram.

5. The control method of the integrated heat dissipation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: The radiator is a fan, and the auxiliary machine power consumption includes the actual power of the fan; The S40 includes: S403, the cooling system model includes a linear function relationship between fan speed and flow rate: Where n f,0 is the rated speed of the fan, q f,0 is the fan rated flow rate, n f,1 is the actual fan speed, q f,1 is the actual flow rate of the fan; S404, inputting a linear function relationship between the actual fan speed and the fan speed and flow rate, and calculating the actual fan flow rate; S405 . Obtain the corresponding actual fan power from a preset fan flow-speed-power diagram according to the actual fan flow and the actual fan speed.

6. The control method of the integrated heat dissipation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: According to the law of conservation of energy, a thermal management model of the electrolytic cell is established, and the heat dissipation requirements of different electrolytic cells are obtained using the thermal management model of the electrolytic cell; The electrolyzer thermal management model includes the following equations: Q el =(U ell -V th )I el n cell ; Where Q el is the heat dissipation of the electrolytic cell, U ell is the measured voltage of a single cell in the electrolytic cell, I el is the total DC current of the electrolytic cell, n cell is the number of single chambers in the electrolytic cell, V th is the theoretical voltage of a single cell in the electrolytic cell, T stack is the electrolytic cell temperature, C stack is the specific heat capacity of the electrolytic cell, T in,PEM is the anode outlet temperature of the electrolytic cell, q cl is the coolant flow rate through the electrolytic cell, Q gas is the amount of heat dissipated by radiation.

7. The control method of the integrated heat dissipation system for producing hydrogen by PEM water electrolysis according to claim 1, characterized in that: The heat dissipation system model includes a radiator model, and the radiator model includes the following formula: Q cl =Q el =A rad K rad (T rad -T atm ); Where Q cl is the heat dissipation of the radiator, A rad is the heat transfer area of ​​the radiator, K rad is the heat transfer coefficient of the radiator, T rad is the heat transfer temperature of the radiator, T atm is the ambient temperature, T rad,in is the heat sink inlet temperature, T rad,out is the radiator outlet temperature.

8. A PEM water electrolysis hydrogen production integrated heat dissipation system, characterized in that: It includes a controller, an electrolytic cell, a heat dissipation device, a heat dissipation demand calculation unit, a heat dissipation capacity calculation unit and an auxiliary machine power consumption calculation unit; The heat dissipation device comprises a first water pump, a second water pump, a radiator and a plate heat exchanger, the cold end outlet of the plate heat exchanger is connected to the inlet of the radiator, the outlet of the radiator is connected to the cold end inlet of the plate heat exchanger via the second water pump, and the hot end outlet of the plate heat exchanger is connected to the anode inlet of the electrolytic cell; the anode outlet of the electrolytic cell is provided with a first temperature sensor; the cold end outlet of the plate heat exchanger is provided with a second temperature sensor; the cold end inlet of the plate heat exchanger is provided with a third temperature sensor; the controller is electrically connected to the first water pump, the second water pump, the radiator, the first temperature sensor, the second temperature sensor and the third temperature sensor respectively; The heat dissipation requirement calculation unit is used to calculate the heat dissipation requirement of the electrolytic cell according to the operating parameters of the electrolytic cell using a preset electrolytic cell thermal management model, and transmit a corresponding heat dissipation requirement signal to the controller; The heat dissipation capacity calculation unit is used to use a preset heat dissipation system model to establish a dynamic relationship between the heat dissipation demand of the electrolytic cell, the speed of the first water pump, the speed of the second water pump, the speed of the radiator and the parameters of the plate heat exchanger, so that the heat dissipation capacity of the heat dissipation device matches the heat dissipation demand of the electrolytic cell; The auxiliary machine power consumption calculation unit is used to calculate the auxiliary machine power consumption according to the actual speed of the first water pump, the actual speed of the second water pump and the actual speed of the radiator, and transmit the actual speed of the first water pump, the actual speed of the second water pump and the actual speed of the radiator to the controller when the auxiliary machine power consumption is a minimum value.

9. The integrated heat dissipation system for producing hydrogen by PEM water electrolysis according to claim 8, characterized in that: The system also includes a PID control unit, which is electrically connected to the controller. The PID control unit uses PID to dynamically adjust the first water pump speed, the radiator speed and the electrolytic cell temperature so that the electrolytic cell temperature is within a target temperature range.

10. The integrated heat dissipation system for producing hydrogen by PEM water electrolysis according to claim 8, characterized in that: The system further comprises a presetting unit, which is used to preset a thermal management model of the electrolytic cell and a heat dissipation system model.

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