Automatic start-stop control method and system of liquid hydrogen centrifugal pump and storage medium

Abstract

The application provides an automatic start-stop control method and system of a liquid hydrogen centrifugal pump and a storage medium. The method comprises the following steps: receiving a start request, obtaining first state information of the liquid hydrogen centrifugal pump in response to the start request, determining whether the first state information meets first preset state information, obtaining control information if yes, generating a precooling signal, performing precooling control on the liquid hydrogen centrifugal pump based on the precooling signal and the control information, obtaining a pump pool temperature value, determining whether the pump pool temperature value is lower than a preset temperature value, generating a start signal if yes, starting the liquid hydrogen centrifugal pump based on the start signal and the control information, so that the pressure value at the outlet of the liquid hydrogen centrifugal pump reaches a preset pressure value and the flow value reaches a preset flow value, obtaining second state information of the liquid hydrogen centrifugal pump during work, determining whether the second state information meets second preset state information, generating a stop signal if yes, and stopping the liquid hydrogen centrifugal pump based on the stop signal. The application can reduce labor cost.

Description

Technical Field

[0001] This application relates to the field of automatic control technology for liquid hydrogen centrifugal pumps, and in particular to an automatic start-stop control method, system, and storage medium for a liquid hydrogen centrifugal pump. Background Technology

[0002] Centrifugal pumps are crucial equipment in the fluid transport field, widely used in various sectors including industry, construction, agriculture, and municipal engineering. With technological advancements and the evolving needs of energy conservation, environmental protection, and logistics, centrifugal pump technology is rapidly innovating. Hydrogen, as a desirable renewable energy source, boasts advantages such as abundant availability, high calorific value, and good safety, earning it the title of "future green energy." This has led to the popularity of liquid hydrogen centrifugal pumps as a currently favored type of centrifugal pump.

[0003] Centrifugal pumps require a start-up and shutdown phase to complete each task. Currently, the start-up and shutdown process for liquid hydrogen centrifugal pumps involves on-site operation and remote control, with both personnel responsible for on-site operation and those responsible for DCS operation receiving instructions. On-site operators manage the opening and closing of local valves or operate the frequency converter to set the pump speed. DCS operators set valve openings and pump speeds on the DCS control system interface and adjust these settings based on feedback from various instruments. This requires operators to monitor changes in temperature, pressure, and flow rate, and manually adjust pump speeds and valve openings according to process conditions, thus demanding a high level of proficiency.

[0004] While current start-up and shutdown control of liquid hydrogen centrifugal pumps allows for the immediate detection of pump malfunctions and pipeline leaks through manual intervention by on-site personnel, enabling timely handling or notification of relevant parties, the cryogenic and easily vaporized nature of liquid hydrogen necessitates coordination between on-site operators and DCS operators. These operators must manually adjust valve openings based on temperature changes in the liquid hydrogen medium, undoubtedly increasing labor costs. Summary of the Invention

[0005] To reduce labor costs, this application provides an automatic start-stop control method, system, and storage medium for a liquid hydrogen centrifugal pump.

[0006] In a first aspect, this embodiment provides an automatic start-stop control method for a liquid hydrogen centrifugal pump, the method comprising:

[0007] Receive a start request, respond to the start request to obtain the first state information of the liquid hydrogen centrifugal pump, determine whether the first state information satisfies the first preset state information, and if so, obtain control information;

[0008] A precooling signal is generated, and a precooling control operation is performed on the liquid hydrogen centrifugal pump based on the precooling signal and the control information. The pump pool temperature value of the liquid hydrogen centrifugal pump is obtained, and it is determined whether the pump pool temperature value is lower than the preset temperature value. If so, a start signal is generated.

[0009] The liquid hydrogen centrifugal pump is started based on the start signal and the control information, so that the pressure value at the outlet of the liquid hydrogen centrifugal pump reaches the preset pressure value and the flow rate reaches the preset flow rate value.

[0010] The second state information of the liquid hydrogen centrifugal pump during operation is obtained, and it is determined whether the second state information meets the second preset state information. If it does, a shutdown signal is generated, and the liquid hydrogen centrifugal pump is shut down based on the shutdown signal.

[0011] In some embodiments, the control information includes preset precooling opening information for the pump pool return valve, pipeline return valve, and pump pool inlet valve during the precooling control phase of the liquid hydrogen centrifugal pump. Precooling control operations on the liquid hydrogen centrifugal pump based on the precooling signal and the control information include:

[0012] The first actual opening information of the pump pool return valve, pipeline return valve and pump pool inlet valve of the liquid hydrogen centrifugal pump is obtained in response to the precooling signal.

[0013] Based on the first actual opening information and the preset precooling opening information, a precooling valve adjustment command group is generated to control the operation of the pump pool return gas valve, pipeline return valve and pump pool inlet valve, so as to perform precooling control operation on the liquid hydrogen centrifugal pump by executing the precooling valve adjustment command group. The precooling valve adjustment command group includes several ordered precooling valve adjustment commands.

[0014] In some embodiments, the first actual opening information includes the first actual opening value of the pump pool return valve, the first actual opening value of the pipeline return valve, and the first actual opening value of the pump pool inlet valve. The preset precooling opening information includes the preset precooling opening value of the pump pool return valve, the preset precooling opening value of the pipeline return valve, and the corresponding first action time, as well as a preset precooling opening value group for the pump pool inlet valve and a corresponding second action time group. Based on the first actual opening information and the preset precooling opening information, a precooling valve control command group for controlling the operation of the pump pool return valve, the pipeline return valve, and the pump pool inlet valve is generated, including:

[0015] Subtract the first actual opening value of the pump pool return air valve from the preset precooling opening value of the pump pool return air valve to obtain the first precooling adjustment value corresponding to the first precooling valve adjustment command in the precooling valve adjustment command group, and generate the corresponding first precooling valve adjustment command based on the first precooling adjustment value.

[0016] Subtract the first actual opening value of the pipeline return valve from the preset precooling opening value of the pipeline return valve to obtain the second precooling adjustment value corresponding to the second precooling valve adjustment command in the precooling valve adjustment command group. Generate the corresponding second precooling valve adjustment command based on the second precooling adjustment value and the first action time.

[0017] The first actual opening value of the pump pool inlet valve is inserted into the first position of the preset pre-cooling opening value group of the pump pool inlet valve to obtain the corresponding pre-cooling opening value group of the pump pool inlet valve, wherein the pre-cooling opening value group of the pump pool inlet valve includes multiple ordered pre-cooling opening values ​​of the pump pool inlet valve.

[0018] The first pump inlet valve precooling opening value is subtracted from the second pump inlet valve precooling opening value in the group of two adjacent pump inlet valve precooling opening values ​​to obtain a group of pump inlet valve precooling adjustment values. The group of pump inlet valve precooling adjustment values ​​includes multiple ordered pump inlet valve precooling adjustment values, and each pump inlet valve precooling adjustment value corresponds to a uniquely determined second action time in the second action time group.

[0019] According to the order in the precooling adjustment group of the pump pool inlet valve, the precooling adjustment command of the pump pool inlet valve is generated sequentially based on the corresponding precooling adjustment value of the pump pool inlet valve and the corresponding second action time.

[0020] The first precooling valve control command, the second precooling valve control command, and a plurality of ordered precooling valve control commands for the pump pool inlet valve are sequentially arranged to obtain the precooling valve control command group.

[0021] In some embodiments, the control information further includes preset start-up opening information for the pipeline reflux valve and the pump pool outlet valve during the start-up phase of the liquid hydrogen centrifugal pump. The start-up operation of the liquid hydrogen centrifugal pump based on the start-up signal and the control information includes:

[0022] In response to the start signal, obtain the second actual opening information of the pipeline return valve and the pump pool outlet valve of the centrifugal pump in the pump pool;

[0023] Based on the second actual opening information and the preset start-up opening information, a pipeline reflux valve start-up adjustment command and a pump pool outlet valve start-up adjustment command are generated to control the operation of the pipeline reflux valve. The start-up preparation work is completed by sequentially executing the pipeline reflux valve start-up adjustment command and the pump pool outlet valve start-up adjustment command.

[0024] The starting pump pool temperature value of the liquid hydrogen centrifugal pump is obtained, and it is determined whether the starting pump pool temperature value is lower than the preset temperature value. If so, a frequency converter action signal is generated to make the liquid hydrogen centrifugal pump stably reach the preset rated speed.

[0025] The pressure and flow rates at the outlet of the liquid hydrogen centrifugal pump are obtained. It is determined whether the pressure reaches a preset pressure value and the flow rate reaches a preset flow rate value. If not, a synchronization valve command is generated. Based on the synchronization valve command, the opening value of the pipeline reflux valve and the opening value of the pump pool outlet valve are controlled so that the pressure at the outlet of the liquid hydrogen centrifugal pump reaches the preset pressure value and the flow rate reaches the preset flow rate value.

[0026] In some embodiments, the control information also includes preset shutdown opening information for the pipeline reflux valve, pump pool outlet valve, outlet pipeline drain valve, pump pool inlet valve, inlet pipeline drain valve, and pump pool return gas valve during the shutdown phase of the liquid hydrogen centrifugal pump. Shutting down the liquid hydrogen centrifugal pump based on the shutdown signal includes:

[0027] In response to the shutdown signal, obtain the third actual opening information of the pipeline reflux valve, pump pool outlet valve, outlet pipeline drain valve, pump pool inlet valve, inlet pipeline drain valve and pump pool return gas valve of the liquid hydrogen centrifugal pump.

[0028] Based on the third actual opening information and the preset shutdown opening information, a shutdown valve adjustment command group is generated to control the pipeline return valve, pump pool outlet valve, outlet pipeline drain valve, pump pool inlet valve, inlet pipeline drain valve and pump pool return gas valve, so as to perform a shutdown operation on the liquid hydrogen centrifugal pump by executing the shutdown valve adjustment command group.

[0029] In some embodiments, the third actual opening information includes the actual opening values ​​of the pipeline reflux valve, the pump pool outlet valve, the outlet pipeline drain valve, the pump pool inlet valve, the inlet pipeline drain valve, and the pump pool return air valve. The preset shutdown opening information includes the preset shutdown opening values ​​of the pipeline reflux valve, the pump pool outlet valve, the outlet pipeline drain valve, the pump pool inlet valve, the inlet pipeline drain valve, and the pump pool return air valve. Based on the third actual opening information and the preset shutdown opening information, a shutdown valve control command group is generated for controlling the pipeline reflux valve, the pump pool outlet valve, the outlet pipeline drain valve, the pump pool inlet valve, the inlet pipeline drain valve, and the pump pool return air valve.

[0030] Subtract the actual shutdown opening value of the pipeline reflux valve from the preset shutdown opening value of the pipeline reflux valve to obtain the first shutdown adjustment value corresponding to the first shutdown adjustment command in the shutdown adjustment command group, and generate the corresponding first shutdown adjustment command based on the first shutdown adjustment value.

[0031] Subtract the preset opening value of the pump pool outlet valve from the actual shutdown opening value of the pump pool outlet valve to obtain the second shutdown adjustment value corresponding to the second shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding second shutdown adjustment command based on the second shutdown adjustment value.

[0032] Subtract the actual shutdown opening value of the outlet pipeline drain valve from the preset shutdown opening value of the outlet pipeline drain valve to obtain the third shutdown adjustment value corresponding to the third shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding third shutdown adjustment command based on the third shutdown adjustment value.

[0033] Subtract the actual shutdown opening value of the pump pool inlet valve from the preset shutdown opening value to obtain the fourth shutdown adjustment value corresponding to the fourth shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding fourth shutdown adjustment command based on the fourth shutdown adjustment value.

[0034] Subtract the actual shutdown opening value of the inlet pipe drain valve from the preset shutdown opening value of the inlet pipe drain valve to obtain the fifth shutdown adjustment value corresponding to the fifth shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding fifth shutdown adjustment command based on the fifth shutdown adjustment value.

[0035] Subtract the actual shutdown opening value of the pump pool return air valve from the preset shutdown opening value of the pump pool return air valve to obtain the sixth shutdown adjustment value corresponding to the sixth shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding sixth shutdown adjustment command based on the sixth shutdown adjustment value.

[0036] The first, second, third, fourth, fifth, and sixth shutdown valve control commands are sequentially ordered to obtain the shutdown valve control command group.

[0037] In some embodiments, the method further includes:

[0038] In response to the shutdown signal, a frequency converter shutdown signal is generated to reduce the speed of the liquid hydrogen centrifugal pump to zero.

[0039] In some embodiments, the method further includes:

[0040] If the pump pool temperature is not lower than the preset temperature value, the actual opening value of the pump pool return valve of the liquid hydrogen centrifugal pump is obtained. The preset cooling opening value of the pump pool return valve is subtracted from the actual opening value to obtain a cooling adjustment value characterizing the cooling of the pump pool. Based on the cooling adjustment value and the corresponding preset working time of the pump pool return valve, a corresponding cooling command is generated to complete the cooling operation of the liquid hydrogen centrifugal pump again by executing the cooling command.

[0041] Secondly, this embodiment provides an automatic start-stop control system for a liquid hydrogen centrifugal pump, the system comprising:

[0042] Thirdly, embodiments of this application provide a storage medium storing a computer program that can run on a processor. When the computer program is executed by the processor, it implements an automatic start-stop control method for a liquid hydrogen centrifugal pump as described in the first aspect.

[0043] By employing the above method, this application first receives a start request, responds to the start request to obtain the first state information of the liquid hydrogen centrifugal pump, determines whether the first state information meets the first preset state information, and if so, obtains control information. Thus, only when the first state information of the liquid hydrogen centrifugal pump meets the first preset state information will the next step, namely obtaining control information, be performed, thereby providing a foundation for subsequently achieving stable and accurate automatic start-stop control.

[0044] Then, a precooling signal is generated. Based on the precooling signal and control information, precooling control operations are performed on the liquid hydrogen centrifugal pump, and the pump pool temperature value is acquired. It is determined whether the pump pool temperature value is lower than the preset temperature value. If so, a start signal is generated. Through valve adjustment during the precooling stage, the pump pool temperature is kept below the preset temperature value, further ensuring the stable and reliable operation of the liquid hydrogen centrifugal pump during the subsequent start-up phase. This process is completed automatically by the equipment without the need for on-site personnel, reducing labor costs and the possibility of personnel accidents.

[0045] Next, based on the start signal and control information, the liquid hydrogen centrifugal pump is started to ensure that the pressure at the pump outlet reaches the preset pressure value and the flow rate reaches the preset flow rate value. This automatically and reliably maintains the liquid hydrogen centrifugal pump's delivery of liquid hydrogen to the greatest extent possible.

[0046] Finally, the second state information of the liquid hydrogen centrifugal pump during operation is obtained, and it is determined whether the second state information meets the second preset state information. If it does, a shutdown signal is generated, and the liquid hydrogen centrifugal pump is shut down based on the shutdown signal. This concludes the entire automatic start-stop control operation of the liquid hydrogen centrifugal pump. Attached Figure Description

[0047] Figure 1This is a schematic diagram of the automatic start-stop control operation of the liquid hydrogen centrifugal pump provided in this embodiment.

[0048] Figure 2 This is a block diagram of an automatic start-stop control method for a liquid hydrogen centrifugal pump provided in this embodiment.

[0049] Figure 3 This is a block diagram of the precooling control operation of a liquid hydrogen centrifugal pump based on precooling signals and control information provided in this embodiment.

[0050] Figure 4 This is a schematic diagram of a specific working process of the liquid hydrogen centrifugal pump provided in this embodiment during the precooling stage.

[0051] Figure 5 This is a block diagram illustrating the start-up operation of a liquid hydrogen centrifugal pump based on a start-up signal and control information, as provided in this embodiment.

[0052] Figure 6 This is a schematic diagram of a specific workflow of the liquid hydrogen centrifugal pump provided in this embodiment during the start-up phase.

[0053] Figure 7 This is a block diagram illustrating the shutdown operation of a liquid hydrogen centrifugal pump based on a shutdown signal, as provided in this embodiment.

[0054] Figure 8 This is a schematic diagram of a specific working process of the liquid hydrogen centrifugal pump during the shutdown phase provided in this embodiment.

[0055] Figure 9 This is a framework diagram of an automatic start-stop control system for a liquid hydrogen centrifugal pump provided in this embodiment. Detailed Implementation

[0056] To better understand the purpose, technical solutions, and advantages of this application, it has been described and illustrated below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that this application can be implemented without these details. It will be apparent to those skilled in the art that various modifications can be made to the embodiments disclosed in this application, and the general principles defined in this application can be applied to other embodiments and application scenarios without departing from the principles and scope of this application. Therefore, this application is not limited to the illustrated embodiments, but is consistent with the broadest scope claimed in this application.

[0057] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0058] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. A liquid hydrogen centrifugal pump works by using the centrifugal motion of the liquid hydrogen in the pump sump caused by the rotation of the impeller. Before starting the liquid hydrogen centrifugal pump, the liquid hydrogen in the pump sump must be at least at a preset temperature. Then, the frequency converter controls the motor to rotate, causing the pump shaft to drive the impeller and liquid hydrogen to rotate at high speed. The liquid hydrogen undergoes centrifugal motion, is thrown towards the edge of the impeller, and flows out of the liquid hydrogen centrifugal pump through the flow channels in the pump casing.

[0059] Figure 1 This is a schematic diagram illustrating the automatic start-stop control of the liquid hydrogen centrifugal pump provided in this embodiment. Figure 1 As shown, the liquid hydrogen centrifugal pump is equipped with an inlet pipe for liquid hydrogen to enter the centrifugal pump, a return gas pipe for returning gas in the pump pool, a return flow pipe for returning liquid in the pump pool, an outlet pipe for liquid hydrogen to leave the centrifugal pump, an inlet waste liquid recovery pipe for recovering waste liquid in the inlet pipe, a return gas recovery pipe for recovering waste gas in the return gas pipe, a pump pool gas recovery pipe for recovering gas in the pump pool, and an outlet waste liquid recovery pipe for recovering waste liquid in the outlet pipe. A pump pool inlet valve V101 is installed in the inlet pipeline; an inlet pipeline drain valve V102 is installed in the inlet waste liquid recovery pipeline; a pump pool return gas valve V103 is installed in the return gas pipeline; a return gas pipeline exhaust valve V104 is installed in the return gas waste gas recovery pipeline; a pipeline return valve V105 is installed in the return pipeline; a pump pool return gas valve V106 is installed in the pump pool gas recovery pipeline; a pump pool outlet valve V107 is installed in the outlet pipeline; and an outlet pipeline drain valve V108 is installed in the outlet waste liquid recovery pipeline. The central processing unit can control the opening values ​​of the pump pool inlet valve V101, the inlet pipeline drain valve V102, the pump pool return gas valve V103, the return gas pipeline exhaust valve V104, the pipeline reflux valve V105, the pump pool return gas valve V106, the pump pool outlet valve V107, and the outlet pipeline drain valve V108, thereby enabling the above valves to work together to complete the automatic start and stop control of the liquid hydrogen centrifugal pump.

[0060] This embodiment provides an automatic start-stop control method for a liquid hydrogen centrifugal pump, which is applied to a central processing unit. Figure 2 This is a block diagram of an automatic start-stop control method for a liquid hydrogen centrifugal pump provided in this embodiment. Figure 2 As shown, an automatic start-stop control method for a liquid hydrogen centrifugal pump includes the following steps:

[0061] Step S100: Receive a start request, respond to the start request to obtain the first state information of the liquid hydrogen centrifugal pump, determine whether the first state information meets the first preset state information, and if it does, obtain control information.

[0062] The aforementioned start request indicates a signal that the liquid hydrogen centrifugal pump needs to operate. This start request can be sent by the operator to the central processing unit, or it can be sent by the liquid hydrogen centrifugal pump itself when powered on. This embodiment does not further limit the specific method of receiving the start request. Data transmission and reception between the liquid hydrogen centrifugal pump and the central processing unit can be wired or wireless. After receiving the start request, the central processing unit sends a status acquisition command to the liquid hydrogen centrifugal pump. Upon receiving this command, the liquid hydrogen centrifugal pump immediately sends its current first status information to the central processing unit, allowing the central processing unit to obtain this information. This first status information includes, but is not limited to, parameters such as the current liquid level, temperature, and pressure in the pump pool. First preset status information represents the required parameter range corresponding to the parameters included in the first status information. This first preset status information includes the reference liquid level range, reference temperature range, and reference pressure range required to formally enter the next working stage, the pre-cooling stage. The system determines whether the liquid level value, temperature value, and pressure value in the first state information fall within the reference liquid level range, reference temperature range, and reference temperature range, respectively. If all three fall within the reference range, the first state information satisfies the first preset state information; if at least one falls outside the reference range, the first state information does not satisfy the first preset state information. The reference liquid level range, reference temperature range, and reference temperature range in the first preset state information can all be determined based on actual conditions.

[0063] If the first state information does not meet the first preset state information, the first state information of the liquid hydrogen centrifugal pump can be manually adjusted again to send a start request to the central processing unit once the first state information meets the first preset state information. Alternatively, an alarm signal can be generated to prompt the operator to replace the liquid hydrogen centrifugal pump with a new one, resend the start request, and adjust the replaced liquid hydrogen centrifugal pump.

[0064] When the first state information satisfies the first preset state information, the control information can be obtained by viewing the control information of the liquid hydrogen centrifugal pump stored in the central processing unit. Alternatively, when it is determined that the first state information satisfies the first preset state information, an information retrieval command can be generated and sent to the operator, so that the operator can send the control information of the liquid hydrogen centrifugal pump to the central processing unit, thereby enabling the central processing unit to obtain the control information. This control information represents a preset opening value of each valve required for the liquid hydrogen centrifugal pump to complete automatic start and stop, the required rotational speed of the centrifugal pump, the minimum temperature value required for the pump tank, and the required pressure and flow rate at the centrifugal pump outlet.

[0065] The control information includes, but is not limited to, the preset pre-cooling opening information of the pump pool return valve V103, pipeline return valve V105, and pump pool inlet valve V101 during the pre-cooling control phase of the liquid hydrogen centrifugal pump; the preset start-up opening information of the pipeline return valve V105 and pump pool outlet valve V107 during the start-up phase of the liquid hydrogen centrifugal pump; the preset shutdown opening information of the pipeline return valve V105, pump pool outlet valve V107, outlet pipeline drain valve V108, pump pool inlet valve V101, inlet pipeline drain valve V102, and pump pool return valve V103 during the shutdown phase of the liquid hydrogen centrifugal pump; and the preset pressure value, preset flow value, and preset temperature value of the pump pool at the outlet of the liquid hydrogen centrifugal pump. The preset pre-cooling opening information includes the preset pre-cooling opening value of the pump pool return valve, the preset pre-cooling opening value of the pipeline return valve and the corresponding first action time, as well as a set of preset pre-cooling opening values ​​for the pump pool inlet valve and a corresponding set of second action times. In this way, the next step, namely acquiring control information, will only proceed when the first state information of the liquid hydrogen centrifugal pump meets the first preset state information, thus providing a foundation for the subsequent stable and accurate automatic start-stop control.

[0066] Step S200: Generate a precooling signal, perform precooling control operation on the liquid hydrogen centrifugal pump based on the precooling signal and control information, obtain the pump pool temperature value of the liquid hydrogen centrifugal pump, determine whether the pump pool temperature value is lower than the preset temperature value, and if so, generate a start signal.

[0067] When the first state information is determined to meet the first preset state information, a pre-cooling signal is also generated simultaneously. The generation of this pre-cooling signal indicates that the liquid hydrogen centrifugal pump can officially enter the first stage of automatic start-stop control, namely the pre-cooling stage. During the pre-cooling stage, the liquid hydrogen centrifugal pump needs to be pre-cooled based on the pre-cooling signal and control information to better execute subsequent workflows. Figure 3 This is a block diagram illustrating the pre-cooling control operation of a liquid hydrogen centrifugal pump based on pre-cooling signals and control information, provided in this embodiment. Figure 3 As shown, the precooling control operation of the liquid hydrogen centrifugal pump based on the precooling signal and control information includes the following steps:

[0068] Step S201: Respond to the precooling signal to obtain the first actual opening information of the pump pool return valve, pipeline return valve and pump pool inlet valve of the liquid hydrogen centrifugal pump.

[0069] Step S202: Based on the first actual opening information and the preset precooling opening information, a precooling valve adjustment command group is generated to control the operation of the pump pool return gas valve, pipeline return valve and pump pool inlet valve, so as to perform precooling control operation on the liquid hydrogen centrifugal pump by executing the precooling valve adjustment command group. The precooling valve adjustment command group includes several ordered precooling valve adjustment commands.

[0070] Sensors are installed at each valve to record its opening degree. After generating the precooling signal, the central processing unit first sends a valve opening degree acquisition command to the liquid hydrogen centrifugal pump to receive the first actual opening degree value of the pump pool return gas valve V103 detected by the sensor at the current moment, the first actual opening degree value of the pipeline return valve detected by the sensor at the current moment, and the first actual opening degree value of the pump pool inlet valve detected by the sensor at the current moment. Among them, the first actual opening degree information includes the first actual opening degree value of the pump pool return gas valve, the first actual opening degree value of the pipeline return valve, and the first actual opening degree value of the pump pool inlet valve.

[0071] After obtaining the first actual opening information of the pump pool return valve V103, pipeline return valve V105, and pump pool inlet valve V101 of the liquid hydrogen centrifugal pump, a pre-cooling valve adjustment command group for adjusting the pump pool return valve V103, pipeline return valve V105, and pump pool inlet valve V101 is determined based on the first actual opening information and the preset pre-cooling opening information. This pre-cooling valve adjustment command group includes several ordered pre-cooling valve adjustment commands, which are sequentially ordered according to the order in which each valve needs to be operated. The central processing unit then sends the valve adjustment commands to the corresponding valves to perform the corresponding actions to pre-cool the liquid hydrogen centrifugal pump. The process of generating a pre-cooling valve adjustment command group for controlling the operation of the pump pool return valve, pipeline return valve, and pump pool inlet valve based on the first actual opening information and the preset pre-cooling opening information includes the following steps:

[0072] Step S202-1: Subtract the first actual opening value of the pump pool return air valve from the preset precooling opening value of the pump pool return air valve to obtain the first precooling valve adjustment value corresponding to the first precooling valve adjustment command in the precooling valve adjustment command group, and generate the corresponding first precooling valve adjustment command based on the first precooling adjustment value.

[0073] Step S202-2: Subtract the first actual opening value of the pipeline return valve from the preset precooling opening value of the pipeline return valve to obtain the second precooling adjustment value corresponding to the second precooling valve adjustment command in the precooling valve adjustment command group. Generate the corresponding second precooling valve adjustment command based on the second precooling adjustment value and the first action time.

[0074] Step S202-3: Insert the first actual opening value of the pump pool inlet valve into the first position of the preset pre-cooling opening value group of the pump pool inlet valve to obtain the corresponding pre-cooling opening value group of the pump pool inlet valve. The pre-cooling opening value group of the pump pool inlet valve includes multiple ordered pre-cooling opening values ​​of the pump pool inlet valve.

[0075] Step S202-4: Sequentially subtract the first precooling opening value from the second precooling opening value of two adjacent precooling opening values ​​in the precooling opening value group of the pump pool inlet valve to obtain a precooling adjustment value group of the pump pool inlet valve. The precooling adjustment value group of the pump pool inlet valve includes multiple ordered precooling adjustment values ​​of the pump pool inlet valve, and each precooling adjustment value of the pump pool inlet valve corresponds to a uniquely determined second action time in the second action time group.

[0076] Step S202-5: Generate Mercedes-Benz inlet valve precooling adjustment command in sequence according to the order in the pump pool inlet valve precooling adjustment group, based on the corresponding pump pool inlet valve precooling adjustment value and the corresponding second action time.

[0077] Step S202-6: Sequentially arrange the first precooling valve control command, the second precooling valve control command, and multiple ordered pump pool inlet valve precooling valve control commands to obtain a precooling valve control command group.

[0078] First, subtracting the first actual opening value of the pump pool return air valve from its preset pre-cooling opening value yields the required change in opening value for the pump pool return air valve V103 based on its current opening; this is the first pre-cooling adjustment value. If this changed opening value is greater than zero, it indicates an adjustment in the direction indicated by the preset pre-cooling opening value; if it is not greater than zero, it indicates an adjustment in the direction indicated by the first actual opening value. This first pre-cooling adjustment value generates a corresponding first pre-cooling valve adjustment command, which the pump pool return air valve V103 receives and converts its opening value from its current value to the preset pre-cooling opening value.

[0079] Similarly, subtracting the first actual opening value of the pipeline reflux valve from its preset precooling opening value yields the required opening value of the pipeline reflux valve V105, i.e., the second precooling adjustment value. Using this second precooling adjustment value and the first action time required for the pipeline reflux valve V105 to maintain its preset precooling opening value, a corresponding second precooling valve control command is generated. Upon receiving this command, the pipeline reflux valve V105 changes its opening value from its current value to its preset precooling opening value.

[0080] During the precooling stage, the opening value of the pump inlet valve V101 needs to be adjusted multiple times. This means the preset precooling opening value group for the pump inlet valve contains N opening values, and the second action time group also contains N second action times. By inserting the first actual opening value of the pump inlet valve before the first opening value in the preset precooling opening value group, a new precooling opening value group containing multiple ordered precooling opening values ​​can be obtained. By successively subtracting the previous opening value from the next opening value in each precooling opening value group, a precooling adjustment value group containing N ordered precooling adjustment values ​​can be obtained. For example, subtracting the first opening value from the second opening value in the precooling opening value group of the pump inlet valve yields the first precooling adjustment value in the precooling adjustment value group of the pump inlet valve. Subtracting the second opening value from the third opening value in the precooling opening value group of the pump inlet valve yields the second precooling adjustment value in the precooling adjustment value group of the pump inlet valve. And so on, subtracting the Nth opening value from the (N+1)th opening value in the precooling opening value group of the pump inlet valve yields the Nth precooling adjustment value in the precooling adjustment value group of the pump inlet valve.

[0081] Each precooling adjustment value in the pump inlet valve precooling adjustment value group corresponds to a second action time. A corresponding precooling adjustment command for the pump inlet valve can be generated from each group's precooling adjustment value and second action time, resulting in N ordered precooling adjustment commands. By sequentially storing the first precooling adjustment command, the second precooling adjustment command, and the N ordered precooling adjustment commands in an empty array, a precooling adjustment command group is obtained. The central processing unit then sends the precooling adjustment commands from the precooling adjustment command group to the corresponding valves to perform precooling control operations on the liquid hydrogen centrifugal pump.

[0082] After the pre-cooling operation is completed, the temperature detection device at the liquid hydrogen centrifugal pump automatically sends the pump pool temperature value to the central processing unit. The central processing unit then obtains the pump pool temperature value and compares it with a known preset temperature value to determine if the pump pool temperature is lower than the preset value. If the pump pool temperature is lower than the preset value, a start signal is generated to indicate that the pre-cooling stage is complete and the next stage, the start-up stage, can begin. Furthermore, the valve adjustments made during the pre-cooling stage ensure that the pump pool temperature is below the preset value, further guaranteeing the smooth and reliable operation of the liquid hydrogen centrifugal pump during the start-up phase. This entire process is completed automatically without the need for on-site personnel, reducing labor costs and the possibility of personnel accidents.

[0083] In addition, if the pump pool temperature is not lower than the preset temperature value, the actual opening value of the pump pool return valve of the liquid hydrogen centrifugal pump is obtained. The preset cooling opening value of the pump pool return valve is subtracted from the actual opening value of the pump pool return valve to obtain a cooling adjustment value that characterizes the cooling of the pump pool. Based on the cooling adjustment value and the corresponding preset working time of the pump pool return valve, a corresponding cooling command is generated to complete the cooling operation of the liquid hydrogen centrifugal pump again by executing the cooling command.

[0084] The aforementioned preset cooling opening value represents the opening value that the pump pool return valve V106 needs to be adjusted to when cooling is performed again via the pump pool return valve V106. This preset cooling opening value is pre-stored in the storage unit of the central processing unit. The actual opening value of the pump pool return valve V106 can be obtained by receiving signals from the sensor at the pump pool return valve V106. Then, the preset cooling opening value of the pump pool return valve is subtracted from the actual opening value to obtain the opening value that the pump pool return valve V106 needs to be adjusted to, i.e., the cooling adjustment value. A corresponding cooling command is generated based on the cooling adjustment value and the corresponding preset working time of the pump pool return valve, and this cooling command is sent to the pump pool return valve V106 so that the pump pool return valve V106 adjusts its opening value to the preset cooling opening value, thereby completing one cooling operation of the pump pool and providing a foundation for the stable and reliable operation of the liquid hydrogen centrifugal pump during the subsequent start-up phase.

[0085] Figure 4 This is a schematic diagram illustrating a specific workflow of the liquid hydrogen centrifugal pump provided in this embodiment during the pre-cooling stage. For example... Figure 4As shown, during the pre-cooling stage, the liquid hydrogen centrifugal pump requires sequential adjustment of the pump pool return valve V103, the pipeline return valve V105, and the pump pool inlet valve V101. The pre-cooling stage only begins after the first preset state information is met, a control signal is received, and the liquid hydrogen centrifugal pump receives a start-up request. Then, the pump pool return valve V103 is opened to 100%, followed by the pipeline return valve V105, which is opened to 100% and maintained for 15 minutes. Next, the pump pool inlet valve V101 is first opened to 10% and maintained for 15 minutes, then to 20% and maintained for 15 minutes, then to 50% and maintained for 15 minutes, and finally to 100% and maintained for 15 minutes, thus completing the pre-cooling operation. Next, it is determined whether the pump pool temperature is lower than the preset temperature value. If it is, the start-up stage begins. If the temperature is not lower than the preset temperature, open the pump pool return air valve V106 to 100% and maintain it for 15 minutes. Then continue to check if the pump pool temperature is lower than the preset temperature. As long as the pump pool temperature is not lower than the preset temperature, open the pump pool return air valve V106 to 100% and maintain it for 15 minutes. Continue until the pump pool temperature is not lower than the preset temperature, then proceed to the next stage, namely the start-up stage.

[0086] Step S300: Start the liquid hydrogen centrifugal pump based on the start signal and control information to make the pressure value at the outlet of the liquid hydrogen centrifugal pump reach the preset pressure value and the flow rate reach the preset flow rate value.

[0087] During the startup phase, the valve opening is controlled based on the startup signal and control information to complete the startup operation, ensuring that the pressure and flow rate at the outlet of the liquid hydrogen centrifugal pump reach the preset pressure and flow rate values, thus providing a foundation for the smooth and reliable delivery of liquid hydrogen by the liquid hydrogen centrifugal pump. Figure 5 This is a block diagram illustrating the start-up operation of a liquid hydrogen centrifugal pump based on a start-up signal and control information, as provided in this embodiment. Figure 5 As shown, the start-up operation of the liquid hydrogen centrifugal pump based on the start-up signal and control information includes the following steps:

[0088] Step S301: Respond to the start signal to obtain the second actual opening information of the pipeline return valve and the pump pool outlet valve of the centrifugal pump in the pump pool.

[0089] Step S302: Based on the second actual opening information and the preset start-up opening information, generate a pipeline reflux valve start-up adjustment command and a pump pool outlet valve start-up adjustment command for controlling the operation of the pipeline reflux valve, so as to complete the start-up preparation work by executing the pipeline reflux valve start-up adjustment command and the pump pool outlet valve start-up adjustment command in sequence.

[0090] Step S303: Obtain the starting pump pool temperature value of the liquid hydrogen centrifugal pump, determine whether the starting pump pool temperature value is lower than the preset temperature value, if so, generate a frequency converter action signal to make the liquid hydrogen centrifugal pump stably reach the preset rated speed.

[0091] Step S304: Obtain the pressure and flow rate at the outlet of the liquid hydrogen centrifugal pump, determine whether the pressure reaches the preset pressure value and the flow rate reaches the preset flow rate, if not, generate a synchronization valve command, and control the opening value of the Kanto reflux valve and the opening value of the pump pool outlet valve based on the synchronization valve command, so that the pressure at the outlet of the liquid hydrogen centrifugal pump reaches the preset pressure value and the flow rate reaches the preset flow rate.

[0092] After generating the start signal, the central processing unit first sends a start valve opening acquisition command to the liquid hydrogen centrifugal pump regarding the pipeline reflux valve V105 and the pump pool outlet valve V107. This is to receive the second actual opening value of the pipeline reflux valve V105 detected by the sensor at that moment, and the second actual opening value of the pump pool outlet valve V107 detected by the sensor at that moment. The second actual opening information includes the second actual opening values ​​of both the pipeline reflux valve and the pump pool outlet valve.

[0093] The aforementioned preset start-up opening information includes the preset start-up opening value of the pipeline reflux valve and the preset start-up opening value of the pump pool outlet valve. Subtracting the second actual opening value of the pipeline reflux valve from its preset start-up opening value yields the pipeline reflux valve V105's required start-up opening value, based on its current opening. A corresponding pipeline reflux valve start-up adjustment command is then generated based on this value. Similarly, subtracting the second actual opening value of the pump pool outlet valve from its preset start-up opening value yields the pump pool outlet valve V107's required start-up opening value, based on its current opening. A corresponding pump pool outlet valve start-up adjustment command is then generated based on this value. In this way, the central processing unit systematically sends the pipeline reflux valve start-up adjustment command and the pump pool outlet valve start-up adjustment command to the corresponding valves to prepare for the start-up of the liquid hydrogen centrifugal pump.

[0094] After the pump pool outlet valve V107 receives and executes the pump pool outlet valve start-up adjustment command, the temperature detection device at the liquid hydrogen centrifugal pump automatically sends the pump pool temperature value to the central processing unit. The central processing unit then obtains the pump pool temperature value and compares it with a known preset temperature value to determine if the pump pool temperature is lower than the preset temperature value. If the pump pool temperature is not lower than the preset temperature value, it indicates that the temperature in the pump pool is too high. In this case, a corresponding cooling command needs to be generated based on the cooling adjustment value and the corresponding preset pump pool return valve operating time. This cooling command is then executed to complete the cooling operation of the liquid hydrogen centrifugal pump again until the pump pool temperature falls below the preset temperature value, at which point the cooling command is no longer executed repeatedly.

[0095] If the pump pool temperature is lower than the preset temperature, it indicates that the centrifugal pump can be turned on. This generates a frequency converter action signal to make the liquid hydrogen centrifugal pump stably reach the preset rated speed. In this way, the liquid hydrogen centrifugal pump can be turned on to prepare for the liquid hydrogen transportation work.

[0096] To ensure the stable and reliable delivery of liquid hydrogen by the centrifugal pump, it is necessary to obtain the pressure and flow rates at the pump's outlet. These values ​​can be adjusted to achieve preset pressure and flow rates. A pressure and flow detection device is installed at the pump's outlet. The pressure and flow rates are obtained by first acquiring data from these devices. Then, the obtained pressure and flow rates are compared to preset values. If the pressure and flow rates match, and the flow rate is greater than the preset flow rate, no further valve adjustments are needed, and the centrifugal pump can deliver liquid hydrogen at its current rate.

[0097] If the obtained pressure value differs from either the preset pressure value or the preset flow rate value, it indicates that the opening values ​​of the pipeline reflux valve V105 and the pump outlet valve V107 need to be adjusted. This generates a synchronization valve command to invoke the interlocking conditions for speed and pressure values ​​set in the DCS control system, achieving speed regulation through PID control. The reflux valve and outlet valve are interlocked with the flow rate, and the pressure is interlocked with the speed. When the flow rate is less than the preset flow rate, the opening value of the pump outlet valve V107 is increased, and the opening value of the pipeline reflux valve V105 is decreased. The opening and closing degrees of the pump outlet valve V107 and the pipeline reflux valve V105 remain the same until the flow rate exceeds the preset flow rate and the pressure value matches the preset pressure value. This automatically and reliably maintains the liquid hydrogen centrifugal pump's delivery of liquid hydrogen to the greatest extent possible.

[0098] Figure 6 This is a schematic diagram illustrating a specific workflow of the liquid hydrogen centrifugal pump during the start-up phase, as provided in this embodiment. Figure 6 As shown, during the startup phase of the liquid hydrogen centrifugal pump, the pump pool inlet valve V101, pipeline return valve V105, and pump pool outlet valve V107 need to be adjusted sequentially. First, adjust the pump pool inlet valve V101 to 100% opening. Then, adjust the pipeline return valve V105 to 100% opening. Next, adjust the pump pool outlet valve V107 to 0% opening. Then, check if the pump pool temperature is lower than the preset temperature value. If it is, start the frequency converter to accelerate the liquid hydrogen centrifugal pump to its rated speed. If it is not lower, open the pump pool return valve V106 to 100% opening and maintain it for 15 minutes. Continue to check if the pump pool temperature is lower than the preset temperature value. As long as the pump pool temperature is not lower than the preset temperature value, open the pump pool return valve V106 to 100% opening again and maintain it for 15 minutes. Continue until the pump pool temperature is not lower than the preset temperature value. Then, start the frequency converter to accelerate the liquid hydrogen centrifugal pump to its rated speed and maintain the rated speed for 30 seconds. Next, open the pump outlet valve V107 while simultaneously closing the pipeline return valve V105, maintaining the same opening degree of the pump outlet valve V107 as the closing degree of the pipeline return valve V105, until the pressure at the outlet equals the preset pressure value and the flow rate is greater than the preset flow rate value. Specifically, this applies when the liquid hydrogen centrifugal pump is at its rated speed.

[0099] Step S400: Obtain the second state information of the liquid hydrogen centrifugal pump when it is working, determine whether the second state information meets the second preset state information, if it does, generate a supply signal, and perform a shutdown operation on the liquid hydrogen centrifugal pump based on the shutdown signal.

[0100] The aforementioned second state information includes, but is not limited to, parameters such as the current temperature and pressure values. The second preset state information represents the required parameter range corresponding to the parameters contained in the second state information. This second preset state information includes a new reference temperature range and a new reference pressure range that must be met before formally entering the next working stage, i.e., the stop stage. It is determined whether the temperature value and pressure value in the second state information fall within the new reference temperature range and the new reference temperature range, respectively. If both fall within the range, it indicates that the second state information meets the second preset state information; if at least one does not fall within the range, it indicates that the second state information does not meet the second preset state information. The new reference temperature range and the new reference pressure range in the second preset state information can be determined according to actual conditions.

[0101] If the second state information does not meet the second preset state information, it indicates that the liquid hydrogen centrifugal pump needs to continue transporting liquid hydrogen. If the second state information meets the second preset state information, it indicates that the liquid hydrogen centrifugal pump needs to stop its current liquid hydrogen transport operation. At this time, the central processing unit generates a stop signal to stop the liquid hydrogen centrifugal pump. Figure 7 This is a block diagram illustrating the shutdown operation of a liquid hydrogen centrifugal pump based on a shutdown signal, as provided in this embodiment. Figure 7 As shown, the shutdown operation of the liquid hydrogen centrifugal pump based on the shutdown signal includes the following steps:

[0102] Step S401: Respond to the shutdown signal to obtain the third actual opening information of the pipeline reflux valve, pump pool outlet valve, outlet pipeline drain valve, pump pool inlet valve, inlet pipeline drain valve, and pump pool return gas valve of the liquid hydrogen centrifugal pump.

[0103] Step S402: Based on the third actual opening information and the preset shutdown opening information, a shutdown valve adjustment command group is generated to control the pipeline return valve, pump pool outlet valve, outlet pipeline drain valve, pump pool inlet valve, inlet pipeline drain valve and pump pool return gas valve, so as to perform a shutdown operation on the liquid hydrogen centrifugal pump by executing the shutdown valve adjustment command group.

[0104] The third actual opening information includes the actual opening values ​​of the pipeline reflux valve, the pump pool outlet valve, the outlet pipeline drain valve, the pump pool inlet valve, the inlet pipeline drain valve, and the pump pool return air valve. The preset shutdown opening information includes the preset shutdown opening values ​​of the pipeline reflux valve, the pump pool outlet valve, the outlet pipeline drain valve, the pump pool inlet valve, the inlet pipeline drain valve, and the pump pool return air valve. Generating a shutdown valve control command group based on the third actual opening information and the preset shutdown opening information for controlling the pipeline reflux valve, pump pool outlet valve, outlet pipeline drain valve, pump pool inlet valve, inlet pipeline drain valve, and pump pool return air valve includes the following steps:

[0105] Step S402-1: Subtract the actual shutdown opening value of the pipeline reflux valve from the preset shutdown opening value of the pipeline reflux valve to obtain the first shutdown adjustment value corresponding to the first shutdown adjustment command in the shutdown adjustment command group, and generate the corresponding first shutdown adjustment command based on the first shutdown adjustment value.

[0106] Step S402-2: Subtract the preset opening value of the pump pool outlet valve from the actual shutdown opening value to obtain the second shutdown adjustment value corresponding to the second shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding second shutdown adjustment command based on the second shutdown adjustment value.

[0107] Step S402-3: Subtract the actual shutdown opening value of the outlet pipeline drain valve from the preset shutdown opening value to obtain the third shutdown adjustment value corresponding to the third shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding third shutdown adjustment command based on the third shutdown adjustment value.

[0108] Step S402-4: Subtract the actual shutdown opening value of the pump pool inlet valve from the preset shutdown opening value to obtain the fourth shutdown adjustment value corresponding to the fourth shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding fourth shutdown adjustment command based on the fourth shutdown adjustment value.

[0109] Step S402-5: Subtract the actual shutdown opening value of the inlet pipeline drain valve from the preset shutdown opening value to obtain the fifth shutdown adjustment value corresponding to the fifth shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding fifth shutdown adjustment command based on the fifth shutdown adjustment value.

[0110] Step S402-6: Subtract the actual shutdown opening value of the pump pool return air valve from the preset shutdown opening value to obtain the sixth shutdown adjustment value corresponding to the sixth shutdown adjustment command in the shutdown adjustment command group; and generate the corresponding sixth shutdown adjustment command based on the sixth shutdown adjustment value.

[0111] Step S402-7: Sequentially arrange the first stop valve control command, the second stop valve control command, the third stop valve control command, the fourth stop valve control command, the fifth stop valve control command, and the sixth stop valve control command to obtain a stop valve control command group.

[0112] The principle here is the same as that of step S202-1 above, so it will not be repeated here.

[0113] In addition, this embodiment also generates a frequency converter shutdown signal in response to a shutdown signal, so that the speed of the liquid hydrogen centrifugal pump is reduced to zero. In this way, the liquid hydrogen centrifugal pump stops rotating when it is not transporting liquid hydrogen, thus saving energy.

[0114] Figure 8 This is a schematic diagram illustrating a specific workflow of the liquid hydrogen centrifugal pump during the shutdown phase provided in this embodiment. For example... Figure 8As shown, during the shutdown phase of the liquid hydrogen centrifugal pump, the following valves need to be adjusted sequentially: pipeline reflux valve V105, pump sump outlet valve V107, outlet pipeline drain valve V108, pump sump inlet valve V101, inlet pipeline drain valve V102, and pump sump return valve V103. The shutdown phase only begins after the second preset state information is met. Then, the pump speed is reduced to zero. Next, the pipeline reflux valve V105 is opened to 50% of its maximum opening. Then, the pump sump outlet valve V107 is opened to 0% of its maximum opening. Next, the outlet pipeline drain valve V108 is opened to 100% of its maximum opening. Next, the pump sump inlet valve V101 is opened to 0% of its maximum opening. Next, the inlet pipeline drain valve V102 is opened to 100% of its maximum opening. Finally, both the pump sump return valve V103 and the pipeline reflux valve V105 are opened to 0% of their maximum opening. Finally, the entire automatic start-stop control of the liquid hydrogen centrifugal pump is completed.

[0115] Figure 9 This is a framework diagram of an automatic start-stop control system for a liquid hydrogen centrifugal pump provided in this embodiment. Figure 9 As shown, an automatic start-stop control system for a liquid hydrogen centrifugal pump includes: an acquisition module, a precooling module, a start-up module, and a shutdown module.

[0116] The acquisition module is used to receive a start request, respond to the start request to obtain the first state information of the liquid hydrogen centrifugal pump, determine whether the first state information meets the first preset state information, and if it does, acquire control information.

[0117] The precooling module generates a precooling signal, performs precooling control operations on the liquid hydrogen centrifugal pump based on the precooling signal and control information, acquires the pump pool temperature value of the liquid hydrogen centrifugal pump, determines whether the pump pool temperature value is lower than a preset temperature value, and if so, generates a start signal. The start module starts the liquid hydrogen centrifugal pump based on the start signal and control information, so that the pressure value at the outlet of the liquid hydrogen centrifugal pump reaches a preset pressure value, and the flow rate reaches a preset flow rate value. The shutdown module acquires the second state information of the liquid hydrogen centrifugal pump during operation, determines whether the second state information meets the second preset state information, and if so, generates a shutdown signal, and performs a shutdown operation on the liquid hydrogen centrifugal pump based on the shutdown signal.

[0118] The other functions performed in the acquisition module, precooling module, start-up module, and shutdown module, as well as the technical details of each function, are the same as or similar to the corresponding features in the automatic start-up and shutdown control method for a liquid hydrogen centrifugal pump described above, so they will not be repeated here.

[0119] This application provides a computer-readable storage medium storing a computer program that, when run on a computer, enables the computer to execute the relevant content in the aforementioned embodiment of an automatic start-stop control method for a liquid hydrogen centrifugal pump.

[0120] It should be understood that although the steps in the flowcharts in the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order requirement for the execution of these steps, and they can be performed in other orders.

[0121] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An automatic start-stop control method for a liquid hydrogen centrifugal pump, characterized in that, The method includes: Receive a start request, respond to the start request to obtain the first state information of the liquid hydrogen centrifugal pump, determine whether the first state information satisfies the first preset state information, and if so, obtain control information; A precooling signal is generated, and a precooling control operation is performed on the liquid hydrogen centrifugal pump based on the precooling signal and the control information. The pump pool temperature value of the liquid hydrogen centrifugal pump is obtained, and it is determined whether the pump pool temperature value is lower than the preset temperature value. If so, a start signal is generated. The liquid hydrogen centrifugal pump is started based on the start signal and the control information, so that the pressure value at the outlet of the liquid hydrogen centrifugal pump reaches the preset pressure value and the flow rate reaches the preset flow rate value. The second state information of the liquid hydrogen centrifugal pump during operation is obtained, and it is determined whether the second state information meets the second preset state information. If it does, a shutdown signal is generated, and the liquid hydrogen centrifugal pump is shut down based on the shutdown signal. The control information includes the preset precooling opening information of the pump pool return valve, pipeline return valve, and pump pool inlet valve during the precooling control phase of the liquid hydrogen centrifugal pump. The precooling control operation of the liquid hydrogen centrifugal pump based on the precooling signal and the control information includes: The first actual opening information of the pump pool return valve, pipeline return valve and pump pool inlet valve of the liquid hydrogen centrifugal pump is obtained in response to the precooling signal. Based on the first actual opening information and the preset precooling opening information, a precooling valve adjustment command group is generated to control the operation of the pump pool return gas valve, pipeline return valve and pump pool inlet valve, so as to perform precooling control operation on the liquid hydrogen centrifugal pump by executing the precooling valve adjustment command group. The precooling valve adjustment command group includes several ordered precooling valve adjustment commands. The control information also includes preset start-up opening information for the pipeline reflux valve and the pump pool outlet valve during the start-up phase of the liquid hydrogen centrifugal pump. The start-up operation of the liquid hydrogen centrifugal pump based on the start-up signal and the control information includes: In response to the start signal, obtain the second actual opening information of the pipeline reflux valve and the pump pool outlet valve of the liquid hydrogen centrifugal pump; Based on the second actual opening information and the preset start-up opening information, a pipeline reflux valve start-up adjustment command and a pump pool outlet valve start-up adjustment command are generated to control the operation of the pipeline reflux valve. The start-up preparation work is completed by sequentially executing the pipeline reflux valve start-up adjustment command and the pump pool outlet valve start-up adjustment command. The starting pump pool temperature value of the liquid hydrogen centrifugal pump is obtained, and it is determined whether the starting pump pool temperature value is lower than the preset temperature value. If so, a frequency converter action signal is generated to make the liquid hydrogen centrifugal pump stably reach the preset rated speed. The pressure and flow rates at the outlet of the liquid hydrogen centrifugal pump are obtained. It is determined whether the pressure reaches a preset pressure value and the flow rate reaches a preset flow rate value. If not, a synchronization valve command is generated. Based on the synchronization valve command, the opening value of the pipeline reflux valve and the opening value of the pump pool outlet valve are controlled so that the pressure at the outlet of the liquid hydrogen centrifugal pump reaches the preset pressure value and the flow rate reaches the preset flow rate value.

2. The method according to claim 1, characterized in that, The first actual opening information includes the first actual opening value of the pump pool return valve, the first actual opening value of the pipeline return valve, and the first actual opening value of the pump pool inlet valve. The preset precooling opening information includes the preset precooling opening value of the pump pool return valve, the preset precooling opening value of the pipeline return valve, and the corresponding first action time, as well as a preset precooling opening value group for the pump pool inlet valve and a corresponding second action time group. Based on the first actual opening information and the preset precooling opening information, a precooling valve control command group for controlling the operation of the pump pool return valve, the pipeline return valve, and the pump pool inlet valve is generated, including: Subtract the first actual opening value of the pump pool return air valve from the preset precooling opening value of the pump pool return air valve to obtain the first precooling adjustment value corresponding to the first precooling valve adjustment command in the precooling valve adjustment command group, and generate the corresponding first precooling valve adjustment command based on the first precooling adjustment value. Subtract the first actual opening value of the pipeline return valve from the preset precooling opening value of the pipeline return valve to obtain the second precooling adjustment value corresponding to the second precooling valve adjustment command in the precooling valve adjustment command group. Generate the corresponding second precooling valve adjustment command based on the second precooling adjustment value and the first action time. The first actual opening value of the pump pool inlet valve is inserted into the first position of the preset pre-cooling opening value group of the pump pool inlet valve to obtain the corresponding pre-cooling opening value group of the pump pool inlet valve, wherein the pre-cooling opening value group of the pump pool inlet valve includes multiple ordered pre-cooling opening values ​​of the pump pool inlet valve. The first pump inlet valve precooling opening value is subtracted from the second pump inlet valve precooling opening value in the group of two adjacent pump inlet valve precooling opening values ​​to obtain a group of pump inlet valve precooling adjustment values. The group of pump inlet valve precooling adjustment values ​​includes multiple ordered pump inlet valve precooling adjustment values, and each pump inlet valve precooling adjustment value corresponds to a uniquely determined second action time in the second action time group. According to the order in the precooling adjustment group of the pump pool inlet valve, the precooling adjustment command of the pump pool inlet valve is generated sequentially based on the corresponding precooling adjustment value of the pump pool inlet valve and the corresponding second action time. The first precooling valve control command, the second precooling valve control command, and a plurality of ordered precooling valve control commands for the pump pool inlet valve are sequentially arranged to obtain the precooling valve control command group.

3. The method according to claim 1, characterized in that, The control information also includes preset shutdown opening information for the pipeline reflux valve, pump pool outlet valve, outlet pipeline drain valve, pump pool inlet valve, inlet pipeline drain valve, and pump pool return gas valve during the shutdown phase of the liquid hydrogen centrifugal pump. Shutting down the liquid hydrogen centrifugal pump based on the shutdown signal includes: In response to the shutdown signal, obtain the third actual opening information of the pipeline reflux valve, pump pool outlet valve, outlet pipeline drain valve, pump pool inlet valve, inlet pipeline drain valve and pump pool return gas valve of the liquid hydrogen centrifugal pump. Based on the third actual opening information and the preset shutdown opening information, a shutdown valve adjustment command group is generated to control the pipeline return valve, pump pool outlet valve, outlet pipeline drain valve, pump pool inlet valve, inlet pipeline drain valve and pump pool return gas valve, so as to perform a shutdown operation on the liquid hydrogen centrifugal pump by executing the shutdown valve adjustment command group.

4. The method according to claim 3, characterized in that, The third actual opening information includes the actual opening values ​​of the pipeline reflux valve, the pump pool outlet valve, the outlet pipeline drain valve, the pump pool inlet valve, the inlet pipeline drain valve, and the pump pool return air valve. The preset shutdown opening information includes the preset shutdown opening values ​​of the pipeline reflux valve, the pump pool outlet valve, the outlet pipeline drain valve, the pump pool inlet valve, the inlet pipeline drain valve, and the pump pool return air valve. Based on the third actual opening information and the preset shutdown opening information, a shutdown valve control command group is generated for controlling the pipeline reflux valve, the pump pool outlet valve, the outlet pipeline drain valve, the pump pool inlet valve, the inlet pipeline drain valve, and the pump pool return air valve. Subtract the actual shutdown opening value of the pipeline reflux valve from the preset shutdown opening value of the pipeline reflux valve to obtain the first shutdown adjustment value corresponding to the first shutdown adjustment command in the shutdown adjustment command group, and generate the corresponding first shutdown adjustment command based on the first shutdown adjustment value. Subtract the preset shutdown opening value of the pump pool outlet valve from the actual shutdown opening value of the pump pool outlet valve to obtain the second shutdown adjustment value corresponding to the second shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding second shutdown adjustment command based on the second shutdown adjustment value. Subtract the actual shutdown opening value of the outlet pipeline drain valve from the preset shutdown opening value of the outlet pipeline drain valve to obtain the third shutdown adjustment value corresponding to the third shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding third shutdown adjustment command based on the third shutdown adjustment value. Subtract the actual shutdown opening value of the pump pool inlet valve from the preset shutdown opening value to obtain the fourth shutdown adjustment value corresponding to the fourth shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding fourth shutdown adjustment command based on the fourth shutdown adjustment value. Subtract the actual shutdown opening value of the inlet pipe drain valve from the preset shutdown opening value of the inlet pipe drain valve to obtain the fifth shutdown adjustment value corresponding to the fifth shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding fifth shutdown adjustment command based on the fifth shutdown adjustment value. Subtract the actual shutdown opening value of the pump pool return air valve from the preset shutdown opening value of the pump pool return air valve to obtain the sixth shutdown adjustment value corresponding to the sixth shutdown adjustment command in the shutdown adjustment command group. Generate the corresponding sixth shutdown adjustment command based on the sixth shutdown adjustment value. The first, second, third, fourth, fifth, and sixth shutdown valve control commands are sequentially ordered to obtain the shutdown valve control command group.

5. The method according to claim 1, characterized in that, The method further includes: In response to the shutdown signal, a frequency converter shutdown signal is generated to reduce the speed of the liquid hydrogen centrifugal pump to zero.

6. The method according to claim 1, characterized in that, The method further includes: If the pump pool temperature is not lower than the preset temperature value, the actual opening value of the pump pool return valve of the liquid hydrogen centrifugal pump is obtained. The preset cooling opening value of the pump pool return valve is subtracted from the actual opening value to obtain a cooling adjustment value characterizing the cooling of the pump pool. Based on the cooling adjustment value and the corresponding preset working time of the pump pool return valve, a corresponding cooling command is generated to complete the cooling operation of the liquid hydrogen centrifugal pump again by executing the cooling command.

7. An automatic start-stop control system for a liquid hydrogen centrifugal pump, characterized in that, The system includes: an acquisition module, a pre-cooling module, a startup module, and a shutdown module; wherein... The acquisition module is used to receive a start request, respond to the start request to obtain the first state information of the liquid hydrogen centrifugal pump, determine whether the first state information satisfies the first preset state information, and if so, acquire control information. The precooling module is used to generate a precooling signal, perform precooling control operation on the liquid hydrogen centrifugal pump based on the precooling signal and the control information, obtain the pump pool temperature value of the liquid hydrogen centrifugal pump, determine whether the pump pool temperature value is lower than the preset temperature value, and if so, generate a start signal. The start-up module is used to start the liquid hydrogen centrifugal pump based on the start-up signal and the control information, so that the pressure value at the outlet of the liquid hydrogen centrifugal pump reaches a preset pressure value and the flow rate reaches a preset flow rate value. The shutdown module is used to acquire the second state information of the liquid hydrogen centrifugal pump when it is working, determine whether the second state information meets the second preset state information, and if it does, generate a shutdown signal and perform a shutdown operation on the liquid hydrogen centrifugal pump based on the shutdown signal. The control information includes the preset precooling opening information of the pump pool return valve, pipeline return valve, and pump pool inlet valve during the precooling control phase of the liquid hydrogen centrifugal pump. The precooling control operation of the liquid hydrogen centrifugal pump based on the precooling signal and the control information includes: The first actual opening information of the pump pool return valve, pipeline return valve and pump pool inlet valve of the liquid hydrogen centrifugal pump is obtained in response to the precooling signal. Based on the first actual opening information and the preset precooling opening information, a precooling valve adjustment command group is generated to control the operation of the pump pool return gas valve, pipeline return valve and pump pool inlet valve, so as to perform precooling control operation on the liquid hydrogen centrifugal pump by executing the precooling valve adjustment command group. The precooling valve adjustment command group includes several ordered precooling valve adjustment commands. The control information also includes preset start-up opening information for the pipeline reflux valve and the pump pool outlet valve during the start-up phase of the liquid hydrogen centrifugal pump. The start-up operation of the liquid hydrogen centrifugal pump based on the start-up signal and the control information includes: In response to the start signal, obtain the second actual opening information of the pipeline reflux valve and the pump pool outlet valve of the liquid hydrogen centrifugal pump; Based on the second actual opening information and the preset start-up opening information, a pipeline reflux valve start-up adjustment command and a pump pool outlet valve start-up adjustment command are generated to control the operation of the pipeline reflux valve. The start-up preparation work is completed by sequentially executing the pipeline reflux valve start-up adjustment command and the pump pool outlet valve start-up adjustment command. The starting pump pool temperature value of the liquid hydrogen centrifugal pump is obtained, and it is determined whether the starting pump pool temperature value is lower than the preset temperature value. If so, a frequency converter action signal is generated to make the liquid hydrogen centrifugal pump stably reach the preset rated speed. The pressure and flow rates at the outlet of the liquid hydrogen centrifugal pump are obtained. It is determined whether the pressure reaches a preset pressure value and the flow rate reaches a preset flow rate value. If not, a synchronization valve command is generated. Based on the synchronization valve command, the opening value of the pipeline reflux valve and the opening value of the pump pool outlet valve are controlled so that the pressure at the outlet of the liquid hydrogen centrifugal pump reaches the preset pressure value and the flow rate reaches the preset flow rate value.

8. A computer-readable storage medium having a computer program stored thereon that can run on a processor, characterized in that, When the computer program is executed by the processor, it implements an automatic start-stop control method for a liquid hydrogen centrifugal pump as described in any one of claims 1 to 6.

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