CN115110119B - Temperature control method and device of hydrogen production system, hydrogen production system - Google Patents

Abstract

The invention discloses a temperature control method and device of a hydrogen production system and the hydrogen production system. The temperature control method of the hydrogen production system comprises the following steps: acquiring a temperature set value, an electrolyzer temperature, an initial flow set value and an outlet flow of a cooling circulation pump; if the hydrogen production system is judged to be in a temperature single disturbance state according to the temperature set value, the temperature of the electrolytic tank, the initial flow set value and the outlet flow, executing a temperature outer ring control process and a flow inner ring control process; wherein, the temperature outer loop control process includes: adjusting an initial flow set value according to the temperature of the electrolytic tank and a temperature set value to obtain a target flow set value; the flow inner loop control process comprises the following steps: and adjusting the operation parameters of the flow control equipment according to the target flow set value and the outlet flow so as to adjust the outlet flow of the cooling circulation pump and further adjust the temperature of the electrolytic tank. The embodiment of the invention can reduce the hysteresis of the temperature control of the hydrogen production system and improve the temperature control precision of the hydrogen production system and the efficiency of the electrolytic tank.

Description

Temperature control method and device of hydrogen production system, hydrogen production system

Technical field

The present invention relates to the technical field of hydrogen production, and in particular to a temperature control method and device for a hydrogen production system, and a hydrogen production system.

Background technique

The electrolytic hydrogen production system uses water as raw material and is composed of electrolytic cells, gas separators, cooling circulation pumps and other equipment for producing high-purity hydrogen. Among them, the temperature of the electrolytic tank directly affects the electrolysis efficiency. If the temperature of the electrolytic tank is too low, it will increase the resistance of the electrolyte and increase the power consumption of electrolytic hydrogen production. If the temperature of the electrolytic tank is too high, it will cause damage to the electrolysis diaphragm and easily cause the hydrogen production system to overshoot. Warm shutdown. Therefore, thermal management is critical to hydrogen production systems. The existing temperature control method of the hydrogen production system is a single-loop control that adjusts the opening of the regulating valve at the outlet of the cooling circulation pump according to the temperature of the electrolyzer. Since the detection point and the control point are far apart, the flow rate at the outlet of the cooling circulation pump changes to the temperature of the electrolyzer. It takes a long time for the change to be recognized by the thermometer, resulting in untimely temperature control of the hydrogen production system, and a temperature control response lag, which affects the temperature control accuracy of the hydrogen production system and the efficiency of the electrolyzer.

Contents of the invention

The invention provides a temperature control method and device for a hydrogen production system, and a hydrogen production system to reduce the hysteresis phenomenon of temperature control of the hydrogen production system and improve the temperature control accuracy and electrolytic cell efficiency of the hydrogen production system.

In a first aspect, embodiments of the present invention provide a temperature control method for a hydrogen production system, including:

Obtain the temperature set value, electrolyzer temperature, initial flow set value and outlet flow rate of the cooling circulation pump;

If it is determined that the hydrogen production system is in a temperature single disturbance state based on the temperature set value, the electrolytic cell temperature, the initial flow set value and the outlet flow rate, then the temperature outer loop control process and the flow rate inner loop control process are executed. ring control process;

Wherein, the temperature outer loop control process includes: adjusting the initial flow set value according to the electrolytic cell temperature and the temperature set value to obtain the target flow set value; the flow inner loop control process includes: according to The target flow set value and the outlet flow adjust the operating parameters of the flow control device to adjust the outlet flow of the cooling circulation pump, thereby adjusting the temperature of the electrolytic cell.

Optionally, the temperature single disturbance state includes: the electrolytic cell temperature is not equal to the temperature set value, and the outlet flow rate is equal to the initial flow set value.

Optionally, the temperature control method of the hydrogen production system further includes: if it is determined based on the temperature setting value, the electrolytic cell temperature, the initial flow setting value and the outlet flow rate that the hydrogen production If the system is in a temperature and flow double disturbance state, the temperature outer loop control process is executed, and the first target flow set value is obtained according to the electrolytic cell temperature and the temperature set value;

Determine whether there is a deviation between the first target flow setting value and the outlet flow rate;

If so, execute the flow inner loop control process and adjust the operating parameters of the flow control device according to the first target flow setting value and the outlet flow rate;

If not, the flow inner loop control process is not executed.

Optionally, the temperature-flow double disturbance state includes: the electrolytic cell temperature is not equal to the temperature set value, and the outlet flow rate is not equal to the initial flow set value.

Optionally, the temperature control method of the hydrogen production system further includes: if it is determined based on the temperature setting value, the electrolytic cell temperature, the initial flow setting value and the outlet flow rate that the hydrogen production When the system is in a single flow disturbance state, the flow inner loop control process is executed, and the operating parameters of the flow control device are adjusted according to the initial flow setting value and the outlet flow rate;

Obtain the adjusted electrolytic cell temperature, and determine whether the deviation between the adjusted electrolytic cell temperature and the temperature set value exceeds a deviation threshold;

If so, execute the temperature outer loop control process, and obtain the second target flow setting value according to the adjusted electrolytic cell temperature and the temperature setting value; and execute the flow inner loop control process, and obtain the second target flow setting value according to the second target flow setting value. The value and the outlet flow rate adjust the operating parameters of the flow control device;

If not, continue to execute the flow inner loop control process, and adjust the operating parameters of the flow control device according to the initial flow setting value and the outlet flow rate.

Optionally, the single flow disturbance state includes: the electrolytic cell temperature is equal to the temperature set value, and the outlet flow rate is not equal to the initial flow set value.

Optionally, the outlet flow is acquired using a first sampling frequency, and the electrolytic cell temperature is acquired using a second sampling frequency;

The first sampling frequency is greater than or equal to the second sampling frequency.

Optionally, determining the target flow setting value according to the electrolytic cell temperature and the temperature setting value includes:

Determine a temperature deviation based on the electrolytic cell temperature and the temperature set value;

The target flow setting value is determined according to the temperature deviation and the temperature-flow correspondence relationship.

Optionally, adjusting the operating parameters of the flow control device according to the target flow setting value and the outlet flow includes:

determining a flow deviation according to the outlet flow and the target flow setting value;

The operating parameters of the flow control device are determined according to the flow deviation and the parameter flow correspondence.

Optionally, adjusting the operating parameters of the flow control device includes:

Adjust the opening of the regulating valve provided at the outlet of the cooling circulation pump.

In a second aspect, embodiments of the present invention also provide a temperature control device for a hydrogen production system, including:

Data acquisition module, used to obtain the temperature set value, electrolytic cell temperature, initial flow set value and outlet flow rate of the cooling circulation pump;

An adjustment module, configured to execute a temperature outer loop when it is determined that the hydrogen production system is in a temperature single disturbance state based on the temperature set value, the electrolyzer temperature, the initial flow set value and the outlet flow rate. The control process and the flow inner loop control process; wherein the temperature outer loop control process includes: adjusting the initial flow set value according to the electrolytic cell temperature and the temperature set value to obtain the target flow set value; The flow inner loop control process includes: adjusting the operating parameters of the flow control device according to the target flow setting value and the outlet flow rate to adjust the outlet flow rate of the cooling circulation pump, thereby adjusting the electrolytic cell temperature.

In a third aspect, embodiments of the present invention also provide a hydrogen production system, including: an electrolyzer, a cooling circulation pump, a flow control device, a thermometer, a flow meter and a control device; the control device is respectively connected to the thermometer, the The flow meter is connected to the flow control device;

The thermometer is used to collect the temperature of the electrolyzer; the flowmeter is used to collect the outlet flow of the cooling circulation pump; and the control device is used to execute the temperature control method of the hydrogen production system provided in any embodiment of the present invention.

In the temperature control method of the hydrogen production system provided by the embodiment of the present invention, cascade control is formed by a temperature outer loop of temperature-flow set value and a flow inner loop of flow-flow control equipment operating parameters. The input and output parameters of the inner loop and the outer loop are directly related, which can effectively reduce the control error caused by the multi-level parameter conversion process of temperature-operating parameters and improve the control accuracy. Moreover, the flow inner loop can directly adjust the operating parameters of the flow control equipment according to the changes in the outlet flow rate, and respond promptly to the flow changes of the cooling circulation pump. The adjustment and feedback channels of the inner and outer loops are effectively shortened, which can speed up the flow control equipment. The response speed reduces the hysteresis of temperature control, shortens the adjustment process, reduces the overshoot of the controlled variable, improves the dynamic characteristics of the controlled object, and reduces the dynamic deviation. At the same time, due to the accelerated response speed of the flow control equipment, the overshoot of the electrolytic cell temperature is reduced, which can effectively reduce the energy consumption of the temperature adjustment process, as well as reduce the energy consumption and electrolysis efficiency caused by excessive electrolytic cell temperature offset. loss. Therefore, compared with the existing technology, embodiments of the present invention can reduce the hysteresis phenomenon of temperature control of the hydrogen production system and improve the temperature control accuracy and electrolytic cell efficiency of the hydrogen production system.

It should be understood that what is described in this section is not intended to identify key or important features of the embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become easily understood from the following description.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic flow chart of a temperature control method for a hydrogen production system provided by an embodiment of the present invention;

FIG2 is a schematic diagram of the control principle of a temperature control method for a hydrogen production system provided by an embodiment of the present invention;

Figure 3 is a schematic flow chart of another temperature control method of a hydrogen production system provided by an embodiment of the present invention;

4 is a schematic structural diagram of a temperature control device for a hydrogen production system provided by an embodiment of the present invention;

Figure 5 is a schematic structural diagram of a hydrogen production system provided by an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only These are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of protection of the present invention.

It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the invention described herein are capable of being practiced in sequences other than those illustrated or described herein. Furthermore, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

Embodiments of the present invention provide a temperature control method for a hydrogen production system, which can be adapted to the temperature adjustment requirements of an electrolytic water hydrogen production system. The method can be executed by a temperature control device of the hydrogen production system. The temperature control device can adopt hardware. And/or implemented in the form of software, the control device can be configured in the control cabinet of the hydrogen production system.

In this embodiment, the hydrogen production system can be composed of the structure of any electrolytic hydrogen production system in the prior art. Exemplarily, the hydrogen production system includes an electrolytic hydrogen production main circuit composed of a pure water supply device, a gas separator, a heat exchanger, an alkali liquid circulation pump and an electrolyzer, and a cooling water supply circuit of a heat exchanger composed of a cooling tower and a cooling water circulation pump. Among them, a thermometer is installed near the electrolyzer, such as at the outlet of the electrolyzer, to detect the temperature of the electrolyzer; a flow control device and a flow meter are installed at the outlet of the cooling water circulation pump, the flow meter is used to detect the outlet flow of the cooling water circulation pump, and the flow control device is used to adjust the outlet flow of the cooling water circulation pump. The thermometer, flow meter, flow control device and control equipment of the hydrogen production system constitute a control circuit of the hydrogen production system, which is used to implement the temperature control method of the hydrogen production system.

Figure 1 is a schematic flow chart of a temperature control method for a hydrogen production system provided by an embodiment of the present invention. As shown in Figure 1, the temperature control method of the hydrogen production system includes the following steps:

S110. Obtain the temperature set value, electrolytic cell temperature, initial flow set value and outlet flow rate of the cooling circulation pump.

Among them, the temperature setting value is the target value for electrolytic cell temperature regulation, which is generally the optimal temperature required for electrolytic cell operation. The temperature set value can be set by the staff or set by the control equipment in the hydrogen production system according to the operating conditions of the hydrogen production system. By way of example, the temperature setpoint may be 90°C. The electrolytic cell temperature may be the temperature at the inlet or outlet of the electrolytic cell. The initial flow setting value is the flow setting value initially determined based on the temperature setting value; the outlet flow rate is the flow rate of the coolant output by the cooling circulation pump, which determines the cooling speed of the heat exchanger. The alkaline liquid flowing out from the gas separator is cooled by the heat exchanger and then transferred to the electrolytic cell. Therefore, the temperature of the electrolytic cell can be indirectly controlled by controlling the outlet flow of the cooling circulation pump.

S120. If it is determined that the hydrogen production system is in a temperature single disturbance state based on the temperature set value, electrolyzer temperature, initial flow set value and outlet flow rate, then the temperature outer loop control process and the flow inner loop control process are executed; among which, the temperature outer loop control process and the flow inner loop control process are executed. The loop control process includes: adjusting the initial flow set value according to the electrolytic cell temperature and temperature set value to obtain the target flow set value; the flow inner loop control process includes: adjusting the operation of the flow control equipment according to the target flow set value and outlet flow Parameters to adjust the outlet flow of the cooling circulation pump and thereby adjust the electrolytic cell temperature.

Among them, the disturbance factors that can cause temperature changes in the electrolyzer can be classified into two categories: temperature disturbance and flow disturbance. Temperature disturbance can be caused by changes in the working environment of the hydrogen production system, etc., and is a direct factor affecting the temperature of the electrolyzer. Flow disturbance can be caused by disturbances in the working power or frequency of the cooling water circulation pump. Changes in cooling water flow affect the working state of the heat exchanger, thereby affecting the temperature of the alkali liquid circulated to the electrolytic cell, which in turn affects the temperature of the electrolytic cell. Flow disturbance can As an indirect factor affecting the temperature of the electrolyzer.

The temperature single disturbance state refers to: relative to the equilibrium state, only temperature disturbance occurs in the hydrogen production system, that is, the hydrogen production system is in a state where the electrolyzer temperature is equal to the temperature set value, and the outlet flow rate is equal to the initial flow set value. Changes It is a state where the temperature of the electrolytic cell is not equal to the temperature set value, but the outlet flow rate is still equal to the initial flow set value. At this time, it is necessary to adjust the outlet flow rate of the cooling circulation pump according to the change in the electrolytic cell temperature to correct the electrolytic cell temperature and return it to near the temperature set value.

Specifically, the temperature outer loop control process and the flow inner loop control process constitute cascade control, and the flow set value based on the flow inner loop adjustment is provided by the temperature outer loop. In this way, compared with the single-loop control of the operating parameters of the temperature-flow control device in the prior art, this embodiment is equivalent to inserting a secondary loop of the operating parameters of the flow-flow control device into the control system, so that the temperature outer loop and the flow rate Inner loop cascade response, input and output parameters of each level are directly related, and the flow inner loop can directly adjust the operating parameters of the flow control device according to changes in outlet flow, thereby reducing the multi-level parameter conversion process of temperature-operating parameters. control error and improve control accuracy. Moreover, in this embodiment, the outer loop is the conversion and adjustment of temperature-flow set value, and the inner loop is the conversion and adjustment of flow-flow control equipment operating parameters. The adjustment and feedback channels at all levels are effectively shortened, which can speed up the flow control equipment. response to avoid the phenomenon that the electrolyzer temperature has deviated significantly from the temperature set value when the flow control device responds, effectively shortening the adjustment process and reducing the overshoot of the controlled variable. For example, the flow control device may be a regulating valve provided at the outlet of the cooling circulation pump, or a regulating valve used to control the flow of alkali liquid; the operating parameters of the flow control device include: the opening of the regulating valve.

In the temperature control method of the hydrogen production system provided by the embodiment of the present invention, cascade control is formed by a temperature outer loop of temperature-flow set value and a flow inner loop of flow-flow control equipment operating parameters. The input and output parameters of the inner loop and the outer loop are directly related, which can effectively reduce the control error caused by the multi-level parameter conversion process of temperature-operating parameters and improve the control accuracy. Moreover, the flow inner loop can directly adjust the operating parameters of the flow control equipment according to the changes in the outlet flow rate, and respond promptly to the flow changes of the cooling circulation pump. The adjustment and feedback channels of the inner and outer loops are effectively shortened, which can speed up the flow control equipment. The response speed reduces the hysteresis of temperature control, shortens the adjustment process, reduces the overshoot of the controlled variable, improves the dynamic characteristics of the controlled object, and reduces the dynamic deviation. At the same time, due to the accelerated response speed of the flow control equipment, the overshoot of the electrolytic cell temperature is reduced, which can effectively reduce the energy consumption of the temperature adjustment process, as well as reduce the energy consumption and electrolysis efficiency caused by excessive electrolytic cell temperature offset. loss. Therefore, compared with the existing technology, embodiments of the present invention can reduce the hysteresis phenomenon of temperature control of the hydrogen production system and improve the temperature control accuracy and electrolytic cell efficiency of the hydrogen production system.

The following is a detailed description of the inner and outer loop cascade control process in conjunction with Figure 2. Figure 2 is a schematic diagram of the control principle of a temperature control method for a hydrogen production system provided by an embodiment of the present invention. Refer to Figure 2. For the temperature outer loop, r1 represents the temperature set value, Gc1 represents the transfer function of the temperature controller, c1 represents the electrolytic cell temperature measurement value, Hm1 represents the transfer function of the temperature measurement transmission unit, f1 represents the temperature disturbance factor, Gf1 represents the transfer function of the temperature disturbance calculation unit, m1 represents the flow setting value output by the temperature controller, and Go1 represents the transfer function of the temperature calculation unit. The temperature outer loop control process includes: according to the electrolytic tank temperature measurement value c1, the electrolytic tank temperature data is converted through the temperature measurement transmission unit; the temperature deviation is determined based on the electrolytic tank temperature data and the temperature set value r1; according to the temperature deviation, the temperature control is performed The conversion of the controller determines the flow set value m1, in which the transfer function Gc1 of the temperature controller can characterize the corresponding relationship between temperature and flow. The specific impact of the outlet flow change on the electrolytic cell temperature can be obtained through calculation by the temperature calculation unit, and the specific impact of the temperature disturbance factor f1 on the electrolytic cell temperature can be obtained through conversion by the temperature disturbance calculation unit. However, it should be noted here that the introduction of the temperature disturbance factor f1 is only to illustrate that the causes of changes in the electrolyzer temperature include changes in the outlet flow rate of the cooling circulation pump and the effects of other temperature disturbance factors. However, in the actual control process, there is no need to distinguish the causes of electrolytic cell temperature changes. As long as the current electrolytic cell temperature data is different from the temperature set value r1, the temperature adjustment process needs to be performed. Therefore, there is no need to collect the temperature disturbance factor f1 during the control process, nor does it need to calculate the specific value of the electrolytic cell temperature change caused by the temperature disturbance factor f1.

For the flow inner loop, m1 represents the flow set value output by the temperature controller, Gc2 represents the transfer function of the flow controller, c2 represents the outlet flow measurement value, Hm2 represents the transfer function of the flow measurement transmission unit, f2 represents the flow disturbance factor, Gf2 represents the transfer function of the flow disturbance calculation unit, m2 represents the operating parameters of the flow control device output by the flow controller, Gv represents the transfer function of the flow control device, and Go2 represents the transfer function of the flow calculation unit. The flow inner loop control process includes: according to the outlet flow measurement value c2, obtain the outlet flow data through the conversion of the temperature measurement transmission unit; determine the flow deviation according to the outlet flow data and the flow set value m1; according to the flow deviation, through the flow controller The conversion determines the operating parameter m2 of the flow control device, where the transfer function Gc2 of the flow controller can characterize the parameter flow correspondence. After the flow control equipment changes the working state according to the operating parameters, the adjusted outlet flow can be calculated through the flow calculation unit; the specific impact of the flow disturbance factor f2 on the outlet flow can be obtained through the conversion of the flow disturbance calculation unit. The regulating effect of the flow control device and the disturbance effect of the flow disturbance factor f2 jointly act on the outlet flow of the cooling circulation pump. It should also be noted here that the introduction of the flow disturbance factor f2 is only to explain the reasons for the changes in the cooling circulation pump outlet flow. In the actual control process, there is no need to distinguish the specific reasons for the changes in the outlet flow, as long as the current outlet flow data is relatively If there is a difference between the current flow set value m1, the flow adjustment process needs to be performed. Therefore, there is no need to collect the flow disturbance factor f2 during the control process, nor does it need to calculate the specific value of the outlet flow change caused by the flow disturbance factor f2.

Based on the above embodiments, optionally, for the flow inner loop control process, the first sampling frequency can be used to obtain the outlet flow and adjust the flow control equipment; for the temperature outer loop control process, the second sampling frequency can be used Obtain the electrolytic cell temperature and update the flow set value. Wherein, the first sampling frequency may be equal to the second sampling frequency, so that the inner and outer loop adjustments of the cascade control process are synchronized in real time. Alternatively, the first sampling frequency can also be greater than the second sampling frequency, that is, in each temperature sampling interval, the flow inner loop control process cycles multiple times; in this way, for each target flow setting value, the flow inner loop passes through multiple Secondary feedback adjustment can adjust the outlet flow of the cooling circulation pump in each temperature sampling interval to be closer to the target flow setting value to ensure the adjustment effect and reduce power consumption.

Below, the temperature control process of the hydrogen production system will be described in detail with reference to a specific embodiment. Figure 3 is a schematic flow chart of another temperature control method of a hydrogen production system provided by an embodiment of the present invention.

Referring to Figure 3, the temperature control method of the hydrogen production system includes the following steps:

S210, obtaining a temperature setting value, an electrolytic cell temperature, an initial flow setting value, and an outlet flow of a cooling circulation pump.

The electrolytic cell temperature may be the electrolytic cell outlet temperature.

S220. Determine the disturbance state of the hydrogen production system; if the hydrogen production system is in a temperature single disturbance state, execute S230; if the hydrogen production system is in a temperature and flow double disturbance state, execute S240-S270; if the hydrogen production system is in a flow single disturbance state , then execute S280-S2B0.

Specifically, the disturbance state of the hydrogen production system is jointly determined based on the temperature set value, electrolyzer temperature, initial flow set value and outlet flow rate. If the electrolyzer temperature is not equal to the temperature set value and the outlet flow is equal to the initial flow set value, the hydrogen production system is in a temperature single disturbance state; if the electrolyzer temperature is not equal to the temperature set value and the outlet flow is not equal to the initial flow set value fixed value, the hydrogen production system is in a temperature and flow double disturbance state; if the flow single disturbance state includes: the electrolyzer temperature is equal to the temperature set value, and the outlet flow is not equal to the initial flow set value, the hydrogen production system is in a flow single disturbance state .

S230. Execute the temperature outer loop control process and the flow inner loop control process.

The temperature single disturbance state corresponds to the situation where the temperature disturbance factor acts on the temperature control outer loop. When the electrolytic cell outlet temperature changes, but the cooling circulation pump outlet flow does not change, the temperature controller changes the flow setting value of the flow inner ring according to the electrolytic cell outlet temperature change, and the flow controller changes the flow setting value according to the adjusted flow setting value. Produces a correction effect, changes the opening of the regulating valve set at the outlet of the cooling circulation pump, and returns the electrolytic cell outlet temperature to the temperature set value.

S240. Execute the temperature outer loop control process, and obtain the first target flow setting value according to the electrolytic cell temperature and the temperature setting value.

The temperature and flow double disturbance state corresponds to the situation where temperature interference factors and flow interference factors act on the hydrogen production system at the same time. Then, when the temperature interference factor and the flow interference factor cause the electrolyzer temperature to change in the same direction, the flow deviation calculated in the flow inner loop will increase significantly, so the output of the flow inner loop will also change greatly to quickly overcome the interference. For example, flow interference factors reduce the outlet flow rate, which will cause the temperature of the electrolytic cell to increase; at this time, the outlet flow measurement value decreases, and the outlet flow rate is smaller than the flow set value at the previous sampling moment. At the same time, the temperature interference factor causes the electrolytic cell outlet temperature to increase, so the electrolytic cell outlet temperature measurement value increases, and the electrolytic cell outlet temperature is greater than the temperature set value, which causes the flow set value output by the temperature outer ring to increase to promote the cooling cycle. The outlet flow of the pump increases, which improves the cooling effect of the heat exchanger and reduces the temperature of the electrolyzer. Therefore, the current outlet flow rate decreases and the current flow set value (i.e., the first target flow set value) increases, so that the current flow deviation increases significantly compared to when it is controlled only by the flow inner loop or only by the temperature outer loop, thus This increases the adjustment amount of the regulating valve opening, allowing the temperature of the electrolytic cell to return to the temperature set value as quickly as possible.

When temperature interference factors and flow interference factors cause the electrolyzer temperature to change in different directions, the flow deviation calculated in the flow inner loop will decrease. Therefore, the flow inner loop can overcome the interference through a smaller output, which can effectively reduce the temperature control energy consumption. When the first target flow set value is equal to the outlet flow, it means that the deviations caused by the two types of disturbance factors can cancel each other. At this time, the flow inner loop does not need to change the opening of the regulating valve.

S250. Determine whether there is a deviation between the first target flow setting value and the outlet flow rate; if yes, execute S260; if not, execute S270.

S260. Execute the flow inner loop control process, and adjust the operating parameters of the flow control device according to the first target flow setting value and the outlet flow.

S270: The flow inner loop control process is not executed.

S280. Execute the flow inner loop control process, and adjust the operating parameters of the flow control device according to the initial flow setting value and the outlet flow.

The flow single disturbance state is the situation where flow disturbance factors act on the inner flow loop. When the flow rate of the circulating coolant pipe changes, the flow inner ring responds immediately to adjust. If the interference is small and the electrolytic cell outlet temperature remains basically unchanged after the flow inner loop is adjusted, the temperature outer loop control does not need to be enabled. If the interference is large, causing the deviation of the electrolyzer outlet temperature from the temperature set value to exceed the deviation threshold, the temperature outer loop control is enabled, and the flow inner loop is affected by both the flow set value and the outlet flow measurement value, and the calculation is The flow deviation increases, the correction effect is strengthened, and the adjustment process is accelerated.

S290. Determine whether the deviation between the adjusted electrolytic cell temperature and the temperature set value exceeds the deviation threshold; if so, execute S2A0-S2B0; if not, return to execute S280 until the adjusted outlet flow is equal to the initial flow set value. .

S2A0: Execute the temperature outer loop control process, and obtain the second target flow set value according to the adjusted electrolytic cell temperature and temperature set value.

S2B0: Execute the flow inner loop control process, and adjust the operating parameters of the flow control device according to the second target flow set value and the outlet flow.

This embodiment realizes the temperature control process of the hydrogen production system through S210-S2B0. The cascade control of the temperature outer loop and the flow inner loop is applied to the temperature adjustment process based on the circulating coolant flow, which can quickly respond to flow disturbances. and speed up the adjustment process for temperature disturbances. Therefore, this control scheme can quickly respond to the interference caused by temperature changes and flow changes in the system, optimize the temperature control scheme, reduce the hysteresis of the electrolyzer outlet temperature control, improve the temperature adjustment accuracy, and reduce the energy consumption of the hydrogen production system.

The embodiment of the present invention further provides a temperature control device for a hydrogen production system, which is used to execute the temperature control method for a hydrogen production system provided by any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. FIG4 is a schematic diagram of the structure of a temperature control device for a hydrogen production system provided by an embodiment of the present invention. Referring to FIG4, the temperature control device for a hydrogen production system includes: a data acquisition module 110 and an adjustment module 120.

Among them, the data acquisition module 110 is used to acquire the temperature setting value, the electrolytic cell temperature, the initial flow setting value and the outlet flow rate of the cooling circulation pump. The adjustment module 120 is used to execute the temperature outer loop control process and the flow inner loop control process when the hydrogen production system is judged to be in a temperature single disturbance state based on the temperature set value, electrolyzer temperature, initial flow set value and outlet flow rate; wherein , the temperature outer loop control process includes: adjusting the initial flow set value according to the electrolytic cell temperature and temperature set value to obtain the target flow set value; the flow inner loop control process includes: adjusting the flow control according to the target flow set value and outlet flow The operating parameters of the equipment are used to adjust the outlet flow of the cooling circulation pump, thereby adjusting the temperature of the electrolyzer.

On the basis of the above embodiments, optionally, the adjustment module 120 is also used to determine that the hydrogen production system is in a temperature-flow double disturbance state based on the temperature set value, electrolyzer temperature, initial flow set value, and outlet flow rate. , execute the temperature outer loop control process, and obtain the first target flow set value according to the electrolytic cell temperature and temperature setting value; determine whether there is a deviation between the first target flow set value and the outlet flow rate; if so, execute the flow inner loop control process , adjust the operating parameters of the flow control device according to the first target flow set value and the outlet flow; if not, the flow inner loop control process is not executed.

On the basis of the above embodiments, optionally, the adjustment module 120 is also used to determine that the hydrogen production system is in a single flow disturbance state based on the temperature set value, electrolyzer temperature, initial flow set value, and outlet flow rate. Execute the flow inner loop control process, adjust the operating parameters of the flow control device according to the initial flow set value and outlet flow; obtain the adjusted electrolytic cell temperature, and determine whether there is a deviation between the adjusted electrolytic cell temperature and the temperature set value exceeds the deviation threshold; if so, execute the temperature outer loop control process, and obtain the second target flow set value according to the adjusted electrolytic cell temperature and temperature setting value; and execute the flow inner loop control process, and set the second target flow rate according to the adjusted electrolytic cell temperature and temperature setting value. value and outlet flow to adjust the operating parameters of the flow control device; if not, continue to execute the flow inner loop control process and adjust the operating parameters of the flow control device according to the initial flow set value and outlet flow.

Based on the above embodiments, optionally, the adjustment module 120 specifically includes: a first adder, used to determine the temperature deviation according to the electrolytic cell temperature and the temperature set value; a temperature controller, used according to the temperature deviation, and The temperature flow corresponding relationship determines the target flow set value; the second adder is used to determine the flow deviation based on the outlet flow and the target flow set value; the flow controller is used to determine the flow control device based on the flow deviation and the parameter flow corresponding relationship. operating parameters.

Embodiments of the present invention also provide a hydrogen production system, including a temperature control device of the hydrogen production system provided by any embodiment of the present invention, used to implement the temperature control method of the hydrogen production system provided by any embodiment of the present invention, with corresponding beneficial effects. Figure 5 is a schematic structural diagram of a hydrogen production system provided by an embodiment of the present invention. Referring to Figure 5, the hydrogen production system includes: electrolytic cell 280, cooling circulation pump 320, flow control equipment, thermometer TE, flow meter FE and control equipment (not shown in the figure); the control equipment is connected with the thermometer TE and flow meter FE respectively. Connect to flow control equipment. Among them, the thermometer TE is used to collect the electrolytic cell temperature; the flow meter FE is used to collect the outlet flow of the cooling circulation pump 320; the flow control device can be a regulating valve TV; the temperature control device of the hydrogen production system can be integrated into the control device for Implement temperature control methods for hydrogen production systems. For example, the control device may be a control cabinet in the hydrogen production system.

Specifically, referring to Figure 5, the hydrogen production system includes an electrolysis main loop and a coolant circulation loop. The main electrolysis circuit is composed of a water purification equipment 210, a pure water tank 220, a pure water pump 230, a gas separator, a heat exchanger 260, an alkali circulation pump 270 and an electrolytic cell 280, which are connected in sequence. Among them, the gas separator is divided into a hydrogen separator 240 and an oxygen separator 250, which are connected at the bottom. In the main electrolysis circuit, a water electrolysis reaction occurs in the electrolytic cell 280 to generate hydrogen and oxygen; the product gas is taken out of the electrolytic cell by the circulating liquid and enters the gas separator; in the gas separator, the product gas is separated from the alkali liquid, and the gas It leaves the electrolysis system from the top of the separator and is used or stored in subsequent links; the alkali liquid flows back into the electrolytic tank 280 after passing through the heat exchanger 260 and the alkali liquid circulation pump 270; the water purification equipment 210, the pure water tank 220 and the pure water pump 230 are used for Pure water required for the reaction is replenished to the electrolyzer 280 in real time.

The coolant circulation loop includes a cooling tower 310, a cooling circulation pump 320 and a heat exchanger 260 which are connected in sequence. In the coolant circulation loop, the cooling tower 310 cools the liquid, and the coolant is supplied to the heat exchanger 260 through the cooling circulation pump 320 to cool the alkali liquid inside the heat exchanger 260; after cooling, the alkali liquid returns to the electrolysis Tank 280, the cooling liquid returns to the cooling tower 310. For the heat exchanger 260, when the opening of the regulating valve TV increases, the cooling water flow increases, which increases the cooling effect of the heat exchanger 260 on the alkali solution; conversely, when the opening of the regulating valve TV decreases, the cooling water flow decreases , so that the cooling effect of the heat exchanger 260 on the alkali solution is reduced.

It should be understood that various forms of the process shown above may be used, with steps reordered, added or deleted. For example, each step described in the present invention can be executed in parallel, sequentially, or in different orders. As long as the desired results of the technical solution of the present invention can be achieved, there is no limitation here.

The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. A method for controlling the temperature of a hydrogen production system, comprising:

acquiring a temperature set value, an electrolyzer temperature, an initial flow set value and an outlet flow of a cooling circulation pump;

if the hydrogen production system is judged to be in a temperature single disturbance state according to the temperature set value, the temperature of the electrolytic tank, the initial flow set value and the outlet flow, executing a temperature outer ring control process and a flow inner ring control process;

wherein, the temperature outer loop control process includes: adjusting the initial flow set value according to the temperature of the electrolytic tank and the temperature set value to obtain a target flow set value; the flow inner loop control process comprises the following steps: and adjusting the operation parameters of the flow control equipment according to the target flow set value and the outlet flow so as to adjust the outlet flow of the cooling circulation pump and further adjust the temperature of the electrolytic tank.

2. The method of temperature control for a hydrogen production system of claim 1, wherein said temperature single disturbance state comprises: the electrolyzer temperature is not equal to the temperature set point and the outlet flow is equal to the initial flow set point.

3. The method for controlling the temperature of a hydrogen production system according to claim 1, further comprising: if the hydrogen production system is judged to be in a temperature flow double-disturbance state according to the temperature set value, the temperature of the electrolytic tank, the initial flow set value and the outlet flow, executing a temperature outer ring control process, and obtaining a first target flow set value according to the temperature of the electrolytic tank and the temperature set value;

judging whether the first target flow set value and the outlet flow have deviation or not;

if yes, executing the flow inner loop control process, and adjusting the operation parameters of the flow control equipment according to the first target flow set value and the outlet flow;

if not, the flow inner loop control process is not executed.

4. A method of controlling the temperature of a hydrogen production system as claimed in claim 3, wherein said temperature flow double disturbance comprises: the electrolyzer temperature is not equal to the temperature set point and the outlet flow rate is not equal to the initial flow rate set point.

5. The method for controlling the temperature of a hydrogen production system according to claim 1, further comprising: if the hydrogen production system is judged to be in a flow single disturbance state according to the temperature set value, the temperature of the electrolytic tank, the initial flow set value and the outlet flow, executing a flow inner loop control process, and adjusting the operation parameters of the flow control equipment according to the initial flow set value and the outlet flow;

acquiring the adjusted temperature of the electrolytic cell, and judging whether the deviation between the adjusted temperature of the electrolytic cell and the temperature set value exceeds a deviation threshold value;

if yes, executing a temperature outer ring control process, and obtaining a second target flow set value according to the adjusted temperature of the electrolytic tank and the temperature set value; executing a flow inner loop control process, and adjusting the operation parameters of the flow control equipment according to the second target flow set value and the outlet flow;

if not, continuing to execute the flow inner loop control process, and adjusting the operation parameters of the flow control equipment according to the initial flow set value and the outlet flow.

6. The method of temperature control for a hydrogen production system of claim 5, wherein said flow single disturbance state comprises: the electrolyzer temperature is equal to the temperature set point and the outlet flow rate is not equal to the initial flow rate set point.

7. The method of controlling the temperature of a hydrogen production system according to claim 1, wherein the outlet flow is obtained using a first sampling frequency and the electrolyzer temperature is obtained using a second sampling frequency;

the first sampling frequency is greater than or equal to the second sampling frequency.

8. The method of temperature control of a hydrogen production system of claim 1, wherein determining a target flow set point based on the electrolyzer temperature and the temperature set point comprises:

determining a temperature deviation from the electrolyzer temperature and the temperature setpoint;

and determining a target flow set value according to the temperature deviation and the corresponding relation of the temperature and the flow.

9. The method of temperature control of a hydrogen production system of claim 1, wherein adjusting an operating parameter of a flow control device based on the target flow set point and the outlet flow comprises:

determining a flow deviation according to the outlet flow and the target flow set value;

and determining the operation parameters of the flow control equipment according to the flow deviation and the corresponding relation of the parameter flow.

10. The method of temperature control of a hydrogen production system of claim 1, wherein adjusting an operating parameter of a flow control device comprises:

and adjusting the opening of an adjusting valve arranged at the outlet of the cooling circulating pump.

11. A temperature control device for a hydrogen production system, comprising:

the data acquisition module is used for acquiring a temperature set value, an electrolyzer temperature, an initial flow set value and an outlet flow of the cooling circulation pump;

the adjusting module is used for executing a temperature outer ring control process and a flow inner ring control process when the hydrogen production system is judged to be in a temperature single disturbance state according to the temperature set value, the temperature of the electrolytic tank, the initial flow set value and the outlet flow; wherein, the temperature outer loop control process includes: adjusting the initial flow set value according to the temperature of the electrolytic tank and the temperature set value to obtain a target flow set value; the flow inner loop control process comprises the following steps: and adjusting the operation parameters of the flow control equipment according to the target flow set value and the outlet flow so as to adjust the outlet flow of the cooling circulation pump and further adjust the temperature of the electrolytic tank.

12. A hydrogen production system, comprising: the system comprises an electrolytic tank, a cooling circulating pump, flow control equipment, a thermometer, a flowmeter and control equipment; the control device is respectively connected with the thermometer, the flowmeter and the flow control device;

the thermometer is used for collecting the temperature of the electrolytic cell; the flowmeter is used for collecting the outlet flow of the cooling circulating pump; the control apparatus is configured to perform a temperature control method of a hydrogen production system as defined in any one of claims 1-10.