Hydrogenation system, hydrogenation machine and hydrogen filling flow rate control method

Abstract

The invention discloses a hydrogenation system, a hydrogenation machine and a hydrogen filling flow rate control method, the hydrogenation system comprises a hydrogenation pipeline, a control valve group, a flow rate detection module and a controller, and the control valve group and the flow rate detection module are arranged on the hydrogenation pipeline; the control valve group is formed by connecting N quantitative control valves in parallel, the internal medium flow rates of all the quantitative control valves in the control valve group under the same condition are different, and all the quantitative control valves in the control valve group can be combined to obtain a plurality of valve combinations with different internal medium flow rates under the same condition; and the controller is used for controlling the on-off state of each quantitative control valve in the control valve group according to the hydrogen filling flow rate detected by the flow rate detection module and a preset control strategy, so that the hydrogen filling flow rate of the to-be-hydrogenated equipment meets a preset requirement. The equipment cost can be effectively reduced while the hydrogen filling flow rate can be automatically adjusted to meet the hydrogenation flow rate requirements under different working conditions.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen filling, and in particular to a hydrogen filling system, a hydrogen filling machine and a hydrogen filling flow rate control method. Background Art

[0002] As an infrastructure for providing hydrogen to hydrogen-filling equipment such as fuel cell vehicles and hydrogen cylinders, the number of hydrogen refueling stations is growing. Hydrogen refueling stations use hydrogen refueling machines to refuel hydrogen-filling equipment. When refueling hydrogen-filling equipment, if the hydrogen refueling flow rate is too high, it will cause the hydrogen refueling equipment to rise too much in temperature, damage the hydrogen refueling equipment, and even cause safety hazards; if the hydrogen refueling flow rate is too low, it will lead to low hydrogen refueling efficiency.

[0003] Therefore, the hydrogen filling system of the existing hydrogen filling machine is usually provided with a flow control valve, which controls the hydrogen filling flow rate through the flow control valve, so that the hydrogen filling flow rate of the hydrogen filling equipment is within a preset flow rate range, thereby ensuring that the temperature rise of the hydrogen filling equipment is within a normal range.

[0004] At present, the flow control valve in the hydrogenation system of the hydrogenation machine usually adopts the following two methods:

[0005] 1. Use an electronically controlled variable valve with adjustable flow rate: The electronically controlled variable valve can automatically adjust the hydrogen filling flow rate according to the hydrogen temperature, hydrogen pressure, etc. during the hydrogenation process. However, the electronically controlled variable valve is expensive, which is more than ten times the price of a conventional quantitative valve;

[0006] 2. Use a quantitative valve with non-adjustable flow rate: Use a manual valve, orifice plate or other quantitative valve to adjust the hydrogen filling flow rate. However, in this method, after the manual valve, orifice plate or other quantitative valve has adjusted its opening, under the same hydrogen pressure condition, its hydrogen filling flow rate is fixed, and it is impossible to automatically adjust the hydrogen filling flow rate according to different hydrogen temperatures, hydrogen pressures and hydrogen filling equipment types during the hydrogen filling process, so the scope of application is small.

[0007] In summary, how to achieve automatic adjustment of the hydrogen filling flow rate to meet the hydrogen filling flow rate requirements under different working conditions while reducing the equipment cost as much as possible is a problem that needs to be solved urgently in the current field. Summary of the invention

[0008] In order to solve the above technical problems, the present application provides a hydrogenation system, a hydrogenation machine and a hydrogen filling flow rate control method, which can automatically adjust the switching state of each quantitative control valve in the control valve group according to the current hydrogen filling flow rate, thereby effectively reducing the equipment cost while meeting the hydrogenation flow rate requirements under different working conditions.

[0009] The first objective of the present application is to provide a hydrogenation system that can automatically adjust the hydrogen filling flow rate to meet the hydrogenation flow rate requirements under different working conditions while reducing equipment costs.

[0010] The above-mentioned application objective 1 of the present application is achieved through the following technical solutions:

[0011] A hydrogenation system comprises a hydrogenation pipeline, a control valve group, a flow rate detection module and a controller, wherein a signal output end of the flow rate detection module is connected to a signal input end of the controller, wherein:

[0012] One end of the hydrogenation pipeline has an air inlet interface, which is used to connect to a hydrogen source, and the other end of the hydrogenation pipeline has an air outlet interface, which is used to connect to a hydrogenation device;

[0013] The control valve group and the flow rate detection module are sequentially arranged on the hydrogenation pipeline along the hydrogen flow direction;

[0014] The control valve group is composed of N quantitative control valves connected in parallel, each of the quantitative control valves in the control valve group has a different internal medium flow rate under the same conditions, and the control signal input end of each quantitative control valve is respectively connected to the control signal output end of the controller, N is a positive integer, and N≥2, and the quantitative control valves in the control valve group can be combined to obtain a plurality of valve combinations with different internal medium flow rates under the same conditions;

[0015] The flow rate detection module is used to detect the hydrogen filling flow rate during the hydrogenation process of the hydrogenation equipment;

[0016] The controller is used to control the switching state of each quantitative control valve in the control valve group according to the hydrogen filling flow rate detected by the flow rate detection module according to a preset control strategy to select to open different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements.

[0017] Preferably, the hydrogenation system further comprises a temperature detection module and a pressure detection module, both of which are arranged on the hydrogenation pipeline and located at one end of the hydrogenation pipeline close to the gas outlet interface, and the signal output ends of the temperature detection module and the pressure detection module are respectively connected to the signal input end of the controller, wherein,

[0018] The temperature detection module is used to detect the temperature of hydrogen in the hydrogenation pipeline;

[0019] The pressure detection module is used to detect the hydrogen pressure in the hydrogenation pipeline.

[0020] Preferably, the controller controls the switch state of each quantitative control valve in the control valve group according to the preset control strategy based on the hydrogen filling flow rate detected by the flow rate detection module to select different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements, which is specifically used for:

[0021] Determining a current optimal hydrogen filling flow rate threshold value according to the hydrogen temperature detected by the temperature detection module and the hydrogen pressure detected by the pressure detection module;

[0022] The hydrogen filling flow rate detected by the flow rate detection module is compared with the determined current optimal hydrogen filling flow rate threshold, and the switching state of each quantitative control valve in the control valve group is controlled according to the comparison result to adjust the hydrogen filling flow rate so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements.

[0023] Preferably, the flow rate detection module is a flow meter.

[0024] Preferably, the temperature detection module is a temperature transmitter, and the pressure detection module is a pressure transmitter.

[0025] Preferably, the hydrogenation system further comprises a filter, which is arranged on the hydrogenation pipeline and located between the air inlet interface and the control valve group.

[0026] The second object of the present application is to provide a hydrogenation machine that can automatically adjust the hydrogen filling flow rate to meet the hydrogenation flow rate requirements under different working conditions while reducing equipment costs.

[0027] The second application objective of the present application is achieved through the following technical solutions:

[0028] A hydrogenation machine includes a hydrogenation gun and a hydrogenation system as described in any one of the above application purposes, wherein the hydrogenation gun is connected to a gas outlet interface of a hydrogenation pipeline in the hydrogenation system.

[0029] The third object of the present application is to provide a method for controlling the hydrogen filling flow rate.

[0030] The third application objective of this application is achieved through the following technical solutions:

[0031] A method for controlling the hydrogen filling flow rate of a hydrogenation system according to any one of the above application purposes comprises the following steps:

[0032] S1, when the hydrogenation system is started, the controller controls one of the quantitative control valves in the control valve group to open according to the preset initial valve opening control strategy, so that hydrogen can enter the hydrogenation equipment from the hydrogen source through the hydrogenation pipeline to realize hydrogenation of the hydrogenation equipment;

[0033] S2, during the hydrogenation process, the flow rate detection module detects the hydrogen filling flow rate of the hydrogenation equipment in real time;

[0034] S3, the controller controls the switching state of each quantitative control valve in the control valve group according to the hydrogen filling flow rate detected by the flow rate detection module according to the preset control strategy to select to open different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements.

[0035] Preferably, in step S3, the controller controls the switch state of each quantitative control valve in the control valve group according to the hydrogen filling flow rate detected by the flow rate detection module according to a preset control strategy to select to open different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements, including:

[0036] S31, the controller obtains the hydrogen temperature and hydrogen pressure of the hydrogen currently being filled in the hydrogenation equipment;

[0037] S32, the controller determines the current optimal hydrogen filling flow rate threshold according to the hydrogen temperature and hydrogen pressure;

[0038] S33, the controller compares the hydrogen filling flow rate detected by the flow rate detection module with the determined current optimal hydrogen filling flow rate threshold,

[0039] If the hydrogen filling flow rate detected by the flow rate detection module is less than the current optimal hydrogen filling flow rate threshold, execute S34,

[0040] If the hydrogen filling flow rate detected by the flow rate detection module is greater than the current optimal hydrogen filling flow rate threshold, execute S35,

[0041] If the hydrogen filling flow rate detected by the flow rate detection module is within the current optimal hydrogen filling flow rate threshold range, each quantitative control valve in the control valve group is controlled to maintain the current switch state;

[0042] S34, the controller controls the valve combination in the control valve group whose internal medium flow rate is greater than the internal medium flow rate of the currently opened valve combination under the same conditions to open, so as to increase the hydrogen filling flow rate, so that the hydrogen filling flow rate of the equipment to be hydrogenated is within the current optimal hydrogen filling flow rate threshold range;

[0043] S35, the controller controls the valve combination in the control valve group whose internal medium flow rate is smaller than the internal medium flow rate of the currently opened valve combination under the same conditions to open, so as to reduce the hydrogen filling flow rate, so that the hydrogen filling flow rate of the equipment to be hydrogenated is within the current optimal hydrogen filling flow rate threshold range.

[0044] Preferably, in step S32, determining the current optimal hydrogen filling flow rate threshold according to the hydrogen temperature and the hydrogen pressure includes:

[0045] The optimal hydrogen filling flow rate threshold that matches the hydrogen temperature and the hydrogen pressure is queried in a preset temperature-pressure-optimal flow rate threshold matching table by table lookup, wherein in the temperature-pressure-optimal flow rate threshold matching table, the hydrogen pressure, the hydrogen temperature and the optimal hydrogen filling flow rate threshold correspond one to one.

[0046] The beneficial effects of this application are as follows:

[0047] The hydrogenation system of the present application controls the hydrogen filling flow rate by adopting a control valve group composed of N quantitative control valves with different internal medium flow rates under the same conditions connected in parallel. The individual quantitative control valves in the control valve group can be combined to obtain a plurality of valve combinations with different internal medium flow rates under the same conditions. In this way, different valve combination opening forms can be adopted to adapt to appropriate filling flow rate requirements. The existing expensive electric variable valve with adjustable flow rate is replaced by a low-cost quantitative control valve combination combined with a corresponding control strategy. The system can automatically adjust the switching state of each quantitative control valve in the control valve group according to the current hydrogen filling flow rate, thereby effectively reducing the equipment cost while meeting the hydrogenation flow rate requirements under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 This is a schematic diagram of the structure of a hydrogenation system in one embodiment of the present application;

[0050] Figure 2 This is a flow chart of a method for controlling the hydrogen filling flow rate of a hydrogen filling system in one embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In the embodiments provided in the present application, it should be understood that the disclosed methods and systems can be implemented in other ways. The system embodiments described below are merely schematic. For example, the division of units and modules is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or modules can be combined, or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0053] In addition, all functional units in the embodiments of the present application may be integrated into one processor, or each unit may be a separate device, or two or more units may be integrated into one device; each functional unit in the embodiments of the present application may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0054] A person skilled in the art can understand that all or part of the steps of the following method embodiments can be completed by program instructions and related hardware. The aforementioned program instructions can be stored in a computer-readable storage medium. When the program instructions are executed, the steps of the following method embodiments are executed; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM), a magnetic disk or an optical disk, and other media that can store program codes.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0056] like Figure 1 As shown, an embodiment of the present application provides a hydrogenation system, which includes a hydrogenation pipeline, a control valve group, a flow rate detection module and a controller. The signal output end of the flow rate detection module is connected to the signal input end of the controller. One end of the hydrogenation pipeline has an air inlet interface, which is used to connect to a hydrogen source. The other end of the hydrogenation pipeline has an air outlet interface, which is used to connect to a device to be hydrogenated. The control valve group and the flow rate detection module are sequentially arranged on the hydrogenation pipeline along the flow direction of hydrogen.

[0057] Specifically, the control valve group is composed of N quantitative control valves connected in parallel, and the internal medium flow rate of each quantitative control valve in the control valve group is different under the same conditions. The control signal input end of each quantitative control valve is respectively connected to the control signal output end of the controller. N is a positive integer, and N≥2. The quantitative control valves in the control valve group can be combined to obtain multiple valve combinations with different internal medium flow rates under the same conditions.

[0058] For example, the control valve group is composed of two quantitative control valves V1 and V2 in parallel with different internal medium flow rates under the same conditions, and the internal medium flow rates of the two quantitative control valves under the same conditions are v1 and v2 respectively, then the opening states of the two quantitative control valves have three valve combinations, namely V1 open (V2 closed), V2 open (V1 closed), V1 and V2 open at the same time, which can control three different hydrogen filling flow rates v1, v2, v1+v2. It should be noted that the "under the same conditions" refers to the conditions of the same hydrogen temperature and hydrogen pressure.

[0059] Specifically, the flow rate detection module is used to detect the hydrogen filling flow rate during the hydrogenation process of the hydrogenation equipment to be refueled; the controller is used to control the switching state of each quantitative control valve in the control valve group according to the preset control strategy based on the hydrogen filling flow rate detected by the flow rate detection module to select to open different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogenation equipment to be refueled meets the preset requirements.

[0060] The working principle of the hydrogenation system in the embodiment of the present application is as follows:

[0061] When in use, the air inlet interface of the hydrogenation pipeline is connected to the hydrogen source, the air outlet interface of the hydrogenation pipeline is connected to the equipment to be hydrogenated, and then the system is started. The controller controls one of the quantitative control valves in the control valve group to open and start hydrogenating the equipment to be hydrogenated. During the hydrogenation process, the flow rate detection module detects the hydrogen filling flow rate of the equipment to be hydrogenated and sends it to the controller. The controller controls the switching state of each quantitative control valve in the control valve group according to the preset control strategy based on the hydrogen filling flow rate to automatically adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the equipment to be hydrogenated meets the preset requirements.

[0062] The hydrogenation system of this embodiment controls the hydrogen filling flow rate by adopting a control valve group composed of N quantitative control valves with different internal medium flow rates under the same conditions connected in parallel. The quantitative control valves in the control valve group can be combined to obtain a plurality of valve combinations with different internal medium flow rates under the same conditions. In this way, different valve combination opening forms can be adopted to adapt to appropriate filling flow rate requirements. The existing expensive electric variable valve with adjustable flow rate is replaced by a low-cost quantitative control valve combination combined with a corresponding control strategy. The system can automatically adjust the switching state of each quantitative control valve in the control valve group according to the current hydrogen filling flow rate, thereby effectively reducing the equipment cost while meeting the hydrogenation flow rate requirements under different working conditions.

[0063] In one embodiment, the hydrogenation system further includes a temperature detection module and a pressure detection module, both of which are arranged on the hydrogenation pipeline and located at one end of the hydrogenation pipeline close to the gas outlet interface, and the signal output ends of the temperature detection module and the pressure detection module are respectively connected to the signal input end of the controller, wherein,

[0064] The temperature detection module is used to detect the hydrogen temperature in the hydrogenation pipeline;

[0065] The pressure detection module is used to detect the hydrogen pressure in the hydrogenation pipeline.

[0066] In this embodiment, a temperature detection module and a pressure detection module are provided at one end of the hydrogenation pipeline close to the gas outlet interface to detect the hydrogen temperature and the hydrogen pressure in the hydrogenation pipeline respectively.

[0067] Specifically, in some other embodiments, for the hydrogenation equipment that has temperature detection and pressure detection functions, the controller can achieve communication connection with the hydrogenation equipment through a communication cable with a connector, so that the hydrogen temperature and the hydrogen pressure in the hydrogenation pipeline can be detected respectively through the temperature detection module and pressure detection module on the hydrogenation equipment.

[0068] In one embodiment, the controller controls the switch state of each quantitative control valve in the control valve group according to the preset control strategy based on the hydrogen filling flow rate detected by the flow rate detection module to select different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements, which is specifically used for:

[0069] Determine the current optimal hydrogen filling flow rate threshold value according to the hydrogen temperature detected by the temperature detection module and the hydrogen pressure detected by the pressure detection module;

[0070] The hydrogen filling flow rate detected by the flow rate detection module is compared with the determined current optimal hydrogen filling flow rate threshold, and the switching state of each quantitative control valve in the control valve group is controlled according to the comparison result to adjust the hydrogen filling flow rate so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements.

[0071] Since the temperature rise rate of hydrogen is different at different temperatures and pressures, its optimal hydrogen filling flow rate is also different. Therefore, when the switching state of each quantitative control valve in the control valve group is controlled according to the hydrogen filling flow rate detected by the flow rate detection module to achieve hydrogen filling flow rate adjustment, the current optimal hydrogen filling flow rate threshold is first determined according to the hydrogen temperature and hydrogen pressure, and then the hydrogen filling flow rate detected by the flow rate detection module is compared with the determined current optimal hydrogen filling flow rate threshold. According to the comparison result, the switching state of each quantitative control valve in the control valve group is controlled to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment to be hydrogenated meets the preset requirements. In this way, the adjustment of the hydrogen filling flow rate is more accurate and reliable, and the hydrogenation efficiency can be maximized while ensuring safe hydrogenation.

[0072] In one embodiment, the flow rate detection module is a flow meter. Since the existing hydrogenation system has a flow meter for measuring the hydrogenation flow rate, and the flow meter usually has the function of detecting the flow rate of the medium, in this embodiment, the flow rate detection module is implemented by a flow meter, without adding additional hardware facilities, so as to better control the equipment cost and system complexity of the hydrogenation system.

[0073] In one embodiment, the temperature detection module is a temperature transmitter, and the pressure detection module is a pressure transmitter. Existing hydrogenation systems usually have their own temperature transmitter and pressure transmitter to detect the hydrogen temperature and hydrogen pressure in the pipeline during hydrogenation, respectively. Therefore, the temperature detection module in this embodiment uses a temperature transmitter, and the temperature and pressure detection equipment in the existing hydrogenation system can be used without adding additional hardware facilities, thereby better controlling the equipment cost and system complexity of the hydrogenation system.

[0074] In one embodiment, the hydrogenation system further includes a filter, which is arranged on the hydrogenation pipeline and located between the air intake interface and the control valve group. By arranging the filter before the air intake of the control valve group to filter out impurities, dust, etc. mixed in the hydrogen, the purity of the hydrogen added to the hydrogenation equipment is improved, and the impurities are also prevented from causing the valve of the control valve group to be stuck.

[0075] An embodiment of the present application also provides a hydrogenator, which includes a hydrogenation gun and the hydrogenation system in any of the above embodiments, and the hydrogenation gun is connected to the gas outlet interface of the hydrogenation pipeline in the hydrogenation system.

[0076] The hydrogenation machine in this embodiment is implemented based on the hydrogenation system in any of the above embodiments. Therefore, the hydrogenation machine has the same working principle and technical effect as the hydrogenation system in the above embodiments, which will not be repeated here.

[0077] like Figure 2 As shown, the embodiment of the present application also provides a method for controlling the hydrogen filling flow rate of the hydrogenation system based on any of the above embodiments, and the method may include the following steps:

[0078] S1, when the hydrogenation system is started, the controller controls one of the quantitative control valves in the control valve group to open according to the preset initial valve opening control strategy, so that hydrogen can enter the hydrogenation equipment from the hydrogen source through the hydrogenation pipeline to realize hydrogenation of the hydrogenation equipment;

[0079] Specifically, the controller controls one of the quantitative control valves in the control valve group to open according to the preset initial valve opening control strategy, and the initial valve opening control strategy may be one of the following:

[0080] Initial valve opening control strategy 1: Randomly open a quantitative control valve in the control valve group;

[0081] Initial valve opening control strategy 2: Open the valve combination with the middle flow rate of the internal medium in the control valve group.

[0082] For example, when the number of valve combinations in the control valve group is an even number, there are two valve combinations with a middle flow rate of the internal medium, and any one of the valve combinations can be selected to open; if the control valve group has only two valve combinations, V1 and V2, and the internal medium flow rates of the two quantitative control valves under the same conditions are v1 and v2 respectively, and v2>v1, then the two quantitative control valves have three different combinations, namely, V1 is open (V2 is closed), V2 is open (V1 is closed), and V1 and V2 are opened at the same time, corresponding to three different hydrogen filling flow rates v1, v2, and v1+v2. If the flow rate of v2 is in the middle, then V2 is opened;

[0083] When the number of valve combinations in the control valve group is odd (for example, m), there is only one valve combination with a middle flow rate of the internal medium, that is, the valve combination with the internal medium flow rate at the (m+1) / 2th position is opened.

[0084] This embodiment preferably adopts the initial valve opening control strategy 2 to select and open the valve combination with the middle flow rate of the internal medium in the control valve group to avoid the hydrogen filling flow rate being too large or too small at the beginning.

[0085] S2, during the hydrogenation process, the flow rate detection module detects the hydrogen filling flow rate of the hydrogenation equipment in real time; the flow rate detection module sends the detected hydrogen filling flow rate information of the hydrogenation equipment to the controller;

[0086] S3, the controller controls the switching state of each quantitative control valve in the control valve group according to the preset control strategy based on the hydrogen filling flow rate detected by the flow rate detection module to select to open different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment to be hydrogenated meets the preset requirements.

[0087] The hydrogen filling flow rate control method of the embodiment of the present application is as follows: first, when the hydrogen filling system is started, the controller controls one of the quantitative control valves in the control valve group to open according to a preset initial valve opening control strategy, so that hydrogen can enter the equipment to be hydrogenated from the hydrogen source through the hydrogenation pipeline to realize hydrogenation of the equipment to be hydrogenated; then, during the hydrogenation process, the flow rate detection module detects the hydrogen filling flow rate of the equipment to be hydrogenated in real time; finally, the controller controls the switching state of each quantitative control valve in the control valve group according to a preset control strategy based on the hydrogen filling flow rate detected by the flow rate detection module to select to open different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the equipment to be hydrogenated meets the preset requirements. In this way, the hydrogen filling flow rate is controlled by adopting a control valve group composed of N quantitative control valves connected in parallel with different internal medium flow rates under the same conditions. The individual quantitative control valves in the control valve group can be combined to obtain multiple valve combinations with different internal medium flow rates under the same conditions, so that different valve combinations can be opened to adapt to appropriate filling flow rate requirements. The existing expensive electric variable valve with adjustable flow rate is replaced by a low-cost quantitative control valve combination combined with a corresponding control strategy. The system can automatically adjust the switching state of each quantitative control valve in the control valve group according to the current hydrogen filling flow rate, thereby effectively reducing equipment costs while meeting the hydrogenation flow rate requirements under different working conditions.

[0088] In one embodiment, in step S3, the controller controls the switch state of each quantitative control valve in the control valve group according to the preset control strategy based on the hydrogen filling flow rate detected by the flow rate detection module to select different valve combinations to adjust the hydrogen filling flow rate so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements, including:

[0089] S31, the controller obtains the hydrogen temperature and hydrogen pressure of the hydrogen currently being filled into the hydrogenation equipment; because the optimal hydrogen filling flow rate is different under different temperature and pressure conditions, therefore, when the controller adjusts the hydrogen filling flow rate according to the hydrogen filling flow rate detected by the flow rate detection module, first, the controller needs to obtain the hydrogen temperature and hydrogen pressure of the hydrogen currently being filled into the hydrogenation equipment, which can be specifically detected by the temperature and pressure detection devices provided by the existing hydrogenation system, or by setting a temperature detection module and a pressure detection module at one end of the hydrogenation pipeline close to the hydrogenation equipment to detect the hydrogen temperature and hydrogen pressure.

[0090] S32, the controller determines the current optimal hydrogen filling flow rate threshold according to the hydrogen temperature and hydrogen pressure;

[0091] After obtaining the hydrogen temperature and hydrogen pressure of the hydrogen currently being filled in the hydrogen filling equipment, the controller further determines the current optimal hydrogen filling flow rate threshold according to the hydrogen temperature and hydrogen pressure. Specifically, the optimal hydrogen filling flow rate threshold can be a specific value or a value range.

[0092] When the controller determines the current optimal hydrogen filling flow rate threshold based on the hydrogen temperature and hydrogen pressure, the hydrogen temperature and hydrogen pressure can be input as independent variables into a pre-constructed hydrogen filling flow rate calculation model to obtain the optimal hydrogen filling flow rate threshold. The hydrogen filling flow rate calculation model can be constructed through experiments based on the degree of influence of hydrogen pressure and hydrogen temperature on the temperature rise of the hydrogen filling equipment and the correlation between the temperature rise of the hydrogen filling equipment and the hydrogen filling flow rate.

[0093] In one embodiment, in order to reduce the amount of calculation and improve the calculation speed of the current optimal hydrogen filling flow rate threshold, the current optimal hydrogen filling flow rate threshold can be determined according to the hydrogen temperature and the hydrogen pressure by looking up a table. The specific method is as follows:

[0094] The optimal hydrogen filling flow rate threshold that matches the hydrogen temperature and the hydrogen pressure is queried in a preset temperature-pressure-optimal flow rate threshold matching table by table lookup, wherein in the temperature-pressure-optimal flow rate threshold matching table, the hydrogen pressure, the hydrogen temperature and the optimal hydrogen filling flow rate threshold correspond one to one.

[0095] It should be noted that in the temperature-pressure-optimal flow rate threshold matching table, the hydrogen pressure, hydrogen temperature and optimal hydrogen filling flow rate threshold are all range values ​​including multiple data points, which can effectively reduce the complexity of the table.

[0096] During specific matching, it is determined by judging which pressure range and temperature range the hydrogen pressure and hydrogen temperature respectively correspond to in the temperature-pressure-optimal flow rate threshold matching table, and then searching the table for the optimal hydrogen filling flow rate threshold corresponding to the pressure range and temperature range. This determination method has small computational complexity, fast speed, and is simple and reliable.

[0097] S33, the controller compares the hydrogen filling flow rate detected by the flow rate detection module with the currently determined optimal hydrogen filling flow rate threshold.

[0098] If the hydrogen filling flow rate detected by the flow rate detection module is less than the current optimal hydrogen filling flow rate threshold, it means that the current hydrogen filling flow rate is too small, resulting in low hydrogen filling efficiency. In order to improve the hydrogen filling efficiency, the hydrogen filling flow rate can be increased to be within the current optimal hydrogen filling flow rate threshold. At this time, S34 is executed.

[0099] If the hydrogen filling flow rate detected by the flow rate detection module is greater than the current optimal hydrogen filling flow rate threshold, it means that the current hydrogen filling flow rate is too high, which may easily cause the temperature rise of the hydrogen filling equipment to be too high, posing a safety hazard. In order to eliminate the safety hazard, it is necessary to reduce the hydrogen filling flow rate to make it within the current optimal hydrogen filling flow rate threshold. At this time, S35 is executed.

[0100] If the hydrogen filling flow rate detected by the flow rate detection module is within the current optimal hydrogen filling flow rate threshold range, each quantitative control valve in the control valve group is controlled to maintain the current switch state;

[0101] S34, the controller controls the valve combination in the control valve group whose internal medium flow rate is greater than the internal medium flow rate of the currently opened valve combination under the same conditions to open, so as to increase the hydrogen filling flow rate, so that the hydrogen filling flow rate of the equipment to be hydrogenated is within the current optimal hydrogen filling flow rate threshold range;

[0102] Specifically, when the controller executes the control to open a valve combination whose internal medium flow rate is greater than the internal medium flow rate of the currently opened valve combination under the same conditions in the control valve group, the specific method is as follows:

[0103] The controller controls the valve combination in the control valve group whose internal medium flow rate is one level higher than the internal medium flow rate of the valve combination currently opened under the same conditions to open (other quantitative control valves are closed) according to the valve combination sequence table of the control valve group stored in advance, and then continues to detect the hydrogen filling flow rate of the hydrogenation equipment in real time through the flow rate detection module. If the hydrogen filling flow rate detected by the flow rate detection module is still less than the current optimal hydrogen filling flow rate threshold, the controller continues to control the valve combination in the control valve group whose internal medium flow rate is one level higher than the internal medium flow rate of the valve combination that has been opened under the same conditions to open (other quantitative control valves are closed) according to the valve combination sequence table of the control valve group stored in advance, until the hydrogen filling flow rate detected after the currently opened valve combination is opened is within the current optimal hydrogen filling flow rate threshold range.

[0104] S35, the controller controls the valve combination in the control valve group whose internal medium flow rate is smaller than the internal medium flow rate of the currently opened valve combination under the same conditions to open, so as to reduce the hydrogen filling flow rate, so that the hydrogen filling flow rate of the equipment to be hydrogenated is within the current optimal hydrogen filling flow rate threshold range.

[0105] Specifically, when the controller executes the control to open a valve combination whose internal medium flow rate is smaller than the internal medium flow rate of the currently opened valve combination under the same conditions in the control valve group, the specific method is as follows:

[0106] The controller controls the valve combination in the control valve group whose internal medium flow rate is one level lower than the internal medium flow rate of the valve combination currently opened under the same conditions to open (other quantitative control valves are closed) according to the valve combination sequence table of the control valve group stored in advance, and then continues to detect the hydrogen filling flow rate of the hydrogenation equipment in real time through the flow rate detection module. If the hydrogen filling flow rate detected by the flow rate detection module is still greater than the current optimal hydrogen filling flow rate threshold, the controller continues to control the valve combination in the control valve group whose internal medium flow rate is one level lower than the internal medium flow rate of the valve combination that has been opened this time under the same conditions to open (other quantitative control valves are closed) according to the valve combination sequence table of the control valve group stored in advance, until the hydrogen filling flow rate detected after the currently opened valve combination is opened is within the current optimal hydrogen filling flow rate threshold range.

[0107] It should be noted that, in this embodiment, the valve combination sequence table of the control valve group has the valve number that needs to be opened corresponding to each valve combination, and all valve combinations are arranged in the order of the internal medium flow rate of each valve combination from small to large or from large to small under the same conditions.

[0108] In order to more clearly illustrate the working principle of the present application, the preset control strategy described in the above step S3 of the present application is described in detail below with a specific example.

[0109] Example 1:

[0110] The control valve group is composed of two quantitative control valves V1 and V2 in parallel with different internal medium flow rates under the same conditions, and the internal medium flow rates of the two quantitative control valves under the same conditions are v1 and v2 respectively, v2>v1, then the opening states of the two quantitative control valves have three valve combinations, namely V1 open (V2 closed), V2 open (V1 closed), V1 and V2 open at the same time, which can control three different hydrogen filling flow rates v1, v2, v1+v2 (arranged in order of flow rate from small to large).

[0111] When the hydrogenation system is started, the controller opens the valve combination with the middle flow rate of the internal medium in the control valve group according to the preset initial valve opening control strategy, that is, opens V2. When the flow rate detection module detects that the flow rate v0 of the hydrogen filling flow rate of the hydrogenation equipment is normal (that is, v0 is within the current optimal hydrogen filling flow rate threshold range), V2 continues to be opened; when v0 is relatively small (that is, v0 is less than the current optimal hydrogen filling flow rate threshold range), V1 is opened, even if V1 and V2 are opened at the same time; when v0 is relatively large (that is, v0 is greater than the current optimal hydrogen filling flow rate threshold range), V2 is closed and V1 is opened at the same time.

[0112] Example 2, the control valve group is composed of three quantitative control valves V1, V2, and V3 connected in parallel with different internal medium flow rates under the same conditions, and the internal medium flow rates of these three quantitative control valves under the same conditions are v1, v2, and v3 respectively, v3>v2>v1, then the opening states of these three quantitative control valves have 7 valve combinations, namely, V1 open (V2, V3 closed), V2 open (V1, V3 closed), V3 open (V1, V2 closed), V1+V2 open (V3 closed), V1+V3 open (V2 closed), V2+V3 open (V1 closed), V1~V3 open at the same time, which can correspondingly control seven different hydrogen filling flow rates v1, v2, v3, v1+v2, v1+v3, v2+v3, v1+v2+v3 (arranged in order of flow rate from small to large).

[0113] When the hydrogenation system is started, the controller opens the valve combination with the middle flow rate of the internal medium in the control valve group according to the preset initial valve opening control strategy, that is, opens V1+V2. When the flow rate detection module detects that the flow rate v0 of the hydrogen filling flow rate of the hydrogenation equipment to be refueled is normal (that is, v0 is within the current optimal hydrogen filling flow rate threshold range), V1+V2 continues to be opened for operation; when v0 is relatively small (that is, v0 is less than the current optimal hydrogen filling flow rate threshold range), V3 is opened and V2 is closed, that is, V1 and V3 are opened and operated at the same time. If v0 is still relatively small, V2 is opened and V1 is closed, that is, V2 and V3 are opened and operated at the same time, and so on; when v0 is relatively large (that is, v0 is greater than the current optimal hydrogen filling flow rate threshold range), V1 and V2 are closed, and V3 is opened at the same time. If v0 is still relatively large, V3 is closed and V2 is opened at the same time, and so on.

[0114] In the above method, when the hydrogen filling flow rate detected by the flow rate detection module is greater than / less than the current optimal hydrogen filling flow rate threshold, by gradually reducing / increasing the hydrogen filling flow rate of the control valve group, the fluctuation of the hydrogen filling flow rate in the hydrogenation pipeline during the hydrogenation process can be effectively reduced, thereby improving the safety of hydrogenation.

[0115] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0116] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0117] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, software modules executed by a processor, or a combination of the two. The software modules may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0118] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydrogenation system, characterized in that: It includes a hydrogenation pipeline, a control valve group, a flow rate detection module and a controller, wherein the signal output end of the flow rate detection module is connected to the signal input end of the controller, wherein: One end of the hydrogenation pipeline has an air inlet interface, which is used to connect to a hydrogen source, and the other end of the hydrogenation pipeline has an air outlet interface, which is used to connect to a hydrogenation device; The control valve group and the flow rate detection module are sequentially arranged on the hydrogenation pipeline along the hydrogen flow direction; The control valve group is composed of N quantitative control valves connected in parallel, each of the quantitative control valves in the control valve group has a different internal medium flow rate under the same conditions, and the control signal input end of each quantitative control valve is respectively connected to the control signal output end of the controller, N is a positive integer, and N≥2, and the quantitative control valves in the control valve group can be combined to obtain a plurality of valve combinations with different internal medium flow rates under the same conditions; The flow rate detection module is used to detect the hydrogen filling flow rate during the hydrogenation process of the hydrogenation equipment; The controller is used to control the switching state of each quantitative control valve in the control valve group according to the hydrogen filling flow rate detected by the flow rate detection module according to a preset control strategy to select to open different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements.

2. The hydrogenation system according to claim 1, characterized in that: It also includes a temperature detection module and a pressure detection module, both of which are arranged on the hydrogenation pipeline and located at one end of the hydrogenation pipeline close to the gas outlet interface, and the signal output ends of the temperature detection module and the pressure detection module are respectively connected to the signal input end of the controller, wherein: The temperature detection module is used to detect the temperature of hydrogen in the hydrogenation pipeline; The pressure detection module is used to detect the hydrogen pressure in the hydrogenation pipeline.

3. The hydrogenation system according to claim 2, characterized in that: The controller controls the switch state of each quantitative control valve in the control valve group according to the preset control strategy based on the hydrogen filling flow rate detected by the flow rate detection module to select different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements, and is specifically used for: Determining a current optimal hydrogen filling flow rate threshold value according to the hydrogen temperature detected by the temperature detection module and the hydrogen pressure detected by the pressure detection module; The hydrogen filling flow rate detected by the flow rate detection module is compared with the determined current optimal hydrogen filling flow rate threshold, and the switching state of each quantitative control valve in the control valve group is controlled according to the comparison result to adjust the hydrogen filling flow rate so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements.

4. The hydrogenation system according to claim 1, characterized in that: The flow rate detection module is a flow meter.

5. The hydrogenation system according to claim 2, characterized in that: The temperature detection module is a temperature transmitter, and the pressure detection module is a pressure transmitter.

6. The hydrogenation system according to any one of claims 1 to 5, characterized in that: It also includes a filter, which is arranged on the hydrogenation pipeline and located between the air intake interface and the control valve group.

7. A hydrogenation machine, comprising a hydrogenation gun, characterized in that: It also includes the hydrogenation system according to any one of claims 1 to 6, wherein the hydrogenation gun is connected to the gas outlet interface of the hydrogenation pipeline in the hydrogenation system.

8. A method for controlling the hydrogen filling flow rate of a hydrogenation system according to any one of claims 1 to 6, characterized in that: The steps include: S1, when the hydrogenation system is started, the controller controls one of the quantitative control valves in the control valve group to open according to the preset initial valve opening control strategy, so that hydrogen can enter the hydrogenation equipment from the hydrogen source through the hydrogenation pipeline to realize hydrogenation of the hydrogenation equipment; S2, during the hydrogenation process, the flow rate detection module detects the hydrogen filling flow rate of the hydrogenation equipment in real time; S3, the controller controls the switching state of each quantitative control valve in the control valve group according to the hydrogen filling flow rate detected by the flow rate detection module according to the preset control strategy to select to open different valve combinations to adjust the hydrogen filling flow rate, so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements.

9. The method for controlling the hydrogen filling flow rate of a hydrogenation system according to claim 8, characterized in that: In step S3, the controller controls the switch state of each quantitative control valve in the control valve group according to the preset control strategy based on the hydrogen filling flow rate detected by the flow rate detection module to select different valve combinations to adjust the hydrogen filling flow rate so that the hydrogen filling flow rate of the hydrogen filling equipment meets the preset requirements, including: S31, the controller obtains the hydrogen temperature and hydrogen pressure of the hydrogen currently being filled in the hydrogenation equipment; S32, the controller determines the current optimal hydrogen filling flow rate threshold according to the hydrogen temperature and hydrogen pressure; S33, the controller compares the hydrogen filling flow rate detected by the flow rate detection module with the determined current optimal hydrogen filling flow rate threshold, If the hydrogen filling flow rate detected by the flow rate detection module is less than the current optimal hydrogen filling flow rate threshold, execute S34, If the hydrogen filling flow rate detected by the flow rate detection module is greater than the current optimal hydrogen filling flow rate threshold, execute S35, If the hydrogen filling flow rate detected by the flow rate detection module is within the current optimal hydrogen filling flow rate threshold range, each quantitative control valve in the control valve group is controlled to maintain the current switch state; S34, the controller controls the valve combination in the control valve group whose internal medium flow rate is greater than the internal medium flow rate of the currently opened valve combination under the same conditions to open, so as to increase the hydrogen filling flow rate, so that the hydrogen filling flow rate of the equipment to be hydrogenated is within the current optimal hydrogen filling flow rate threshold range; S35, the controller controls the valve combination in the control valve group whose internal medium flow rate is smaller than the internal medium flow rate of the currently opened valve combination under the same conditions to open, so as to reduce the hydrogen filling flow rate, so that the hydrogen filling flow rate of the equipment to be hydrogenated is within the current optimal hydrogen filling flow rate threshold range.

10. The method for controlling the hydrogen filling flow rate of a hydrogenation system according to claim 9, characterized in that: In step S32, determining the current optimal hydrogen filling flow rate threshold according to the hydrogen temperature and hydrogen pressure includes: The optimal hydrogen filling flow rate threshold that matches the hydrogen temperature and the hydrogen pressure is queried in a preset temperature-pressure-optimal flow rate threshold matching table by table lookup, wherein in the temperature-pressure-optimal flow rate threshold matching table, the hydrogen pressure, the hydrogen temperature and the optimal hydrogen filling flow rate threshold correspond one to one.

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