CN118582658A - A comprehensive hydrogen source hydrogenation station and its control method and control system - Google Patents

Abstract

The present invention discloses a comprehensive hydrogen source hydrogenation station and a control method and control system thereof. After receiving the hydrogen output by the hydrogen production system, the low-pressure compressor outputs it to a low-pressure storage tank for storage after pressurization, or outputs it to a medium- and high-pressure compressor, and after pressurization by the medium- and high-pressure compressor, outputs it to at least one of a high-pressure storage tank and a medium-pressure storage tank for storage. The control panel controls the hydrogenator to connect to at least one of the low-pressure storage tank, the high-pressure storage tank, and the medium-pressure storage tank for gasification according to the gasification requirements in the received gasification instruction. The medium- and high-pressure compressors perform secondary pressurization on the hydrogen pressurized by the low-pressure compressor to become medium-pressure gas or high-pressure gas, thereby reducing the pressurization time. The low-pressure storage tank, the high-pressure storage tank, and at least one of the medium-pressure storage tank are connected for gasification, and the gasification operation at any gas pressure in the interval can be realized, thereby improving the adaptability to different gasification requirements.

Description

A comprehensive hydrogen source hydrogenation station and its control method and control system

Technical Field

The present invention relates to the technical field of hydrogen energy utilization, and in particular to an integrated hydrogen source hydrogenation station and a control method and control system thereof.

Background Art

Although the power supply of wind and solar energy is unstable, which leads to a lot of wind and electricity abandonment, which increases the cost of power generation in disguise. However, converting the excess electricity generated by new energy power stations into chemical energy can improve the efficiency of energy utilization and reduce the cost of power generation in disguise. For example, converting electricity into chemical energy in hydrogen can reduce the size cost of energy, and hydrogen can directly replace the oil used in current fuel vehicles, which is conducive to the stable supply and use of energy.

The existing hydrogen supply of hydrogen refueling stations is limited to the supply of hydrogen by tube bundle trucks. The existing hydrogen compressor suction pressure requirement is relatively high, generally requiring 5-20MPa. At the end of the unloading period, there is a large amount of low-pressure hydrogen in the tube bundle truck that is not fully unloaded, resulting in the waste of hydrogen that is not fully unloaded, causing the problem of low hydrogen utilization.

Therefore, those skilled in the art need to solve the problem of low hydrogen utilization rate in hydrogen refueling stations.

Summary of the invention

The purpose of the present invention is to provide a comprehensive hydrogen source hydrogenation station and a control method and control system thereof to improve the hydrogen utilization efficiency.

In order to solve the above technical problems, an embodiment of the present invention provides a comprehensive hydrogen source hydrogenation station, including a low-pressure compressor, a medium- and high-pressure compressor, a forward control panel, a high-pressure storage tank, a medium-pressure storage tank, a low-pressure storage tank and a hydrogenation machine, wherein the low-pressure compressor is connected to a hydrogen production system, and is used to receive the hydrogen output by the hydrogen production system, and then output it to the low-pressure storage tank for storage after pressurization;

The medium- and high-pressure compressor is connected to the low-pressure compressor, and is used to re-pressurize the hydrogen after the pressurization treatment by the low-pressure compressor and output it to at least one of the high-pressure storage tank and the medium-pressure storage tank for storage;

The sequential control panel is connected to the low-pressure storage tank, the high-pressure storage tank and the medium-pressure storage tank, and the hydrogenator is connected to the low-pressure storage tank, the high-pressure storage tank and the medium-pressure storage tank. The sequential control panel is used to control the hydrogenator to connect to at least one of the low-pressure storage tank, the high-pressure storage tank and the medium-pressure storage tank for gas filling operation according to the gas filling requirement in the received gas filling instruction.

Among them, it also includes an air unloading column, which is respectively connected to the low-pressure compressor and the forward control panel. The hydrogen in the tube bundle vehicle is directly stored in the low-pressure storage tank after being controlled by the forward control panel; or, the hydrogen in the tube bundle vehicle is pressurized by the low-pressure compressor and the medium- and high-pressure compressors, and then stored in the medium-pressure storage tank or the high-pressure storage tank through the forward control panel.

It also includes a cooling device and a pre-cooling heat exchanger arranged on the hydrogenator, and the cooling device is connected to the low-pressure compressor, the medium- and high-pressure compressors, and the pre-cooling heat exchanger.

In addition, the embodiment of the present application also provides a comprehensive hydrogen source hydrogenation station control method, including:

The low-pressure compressor is connected to the hydrogen production system and receives the hydrogen output by the hydrogen production system, and then outputs it to the low-pressure storage tank after pressurization;

The medium- and high-pressure compressors are connected to the low-pressure compressor, and after receiving the low-pressure hydrogen output by the low-pressure compressor, the low-pressure hydrogen is output to the medium-pressure storage tank or the high-pressure storage tank after pressurization treatment;

After receiving the refueling instruction, according to the air pressure requirement of the vehicle to be refueled, the hydrogen filling machine and the sequential control panel are controlled to first connect to the low-pressure storage tank for refueling, and after disconnecting after reaching the first predetermined air pressure, the hydrogen filling machine and the sequential control panel are controlled to connect to the medium-pressure storage tank or the high-pressure storage tank for secondary refueling until the expected air pressure is reached.

Among them, it also includes:

The hydrogen in the tube bundle vehicle is controlled by the sequential control panel and then stored in the low-pressure storage tank or the medium-pressure storage tank, or the hydrogen in the tube bundle vehicle is pressurized by the medium- and high-pressure compressors and then stored in the medium- and high-pressure storage tank.

Among them, it also includes:

The low-pressure compressor is connected to the tube bundle truck, and the residual hydrogen after unloading the tube bundle truck is continuously extracted by the low-pressure compressor and then directly stored in the low-pressure storage tank after being pressurized, or is pressurized by the medium- and high-pressure compressors and then charged into the medium-pressure storage tank or the high-pressure storage tank.

Among them, it also includes:

According to the hydrogen flow rate output by the hydrogen production system, the air pressure requirement of the vehicle to be refueled, and the current air pressure values of the low-pressure storage tank, the medium-pressure storage tank, and the high-pressure storage tank, the sequential control panel is controlled to selectively connect the low-pressure storage tank, the medium-pressure storage tank, and the high-pressure storage tank to the hydrogen filling machine to perform the refueling operation on the vehicle to be refueled.

Among them, it also includes:

A primary pressurization threshold of the medium pressure storage tank is set.

In addition, an embodiment of the present application also provides an integrated hydrogen source hydrogen refueling station control system, which is applied to the integrated hydrogen source hydrogen refueling station control method as described above, including a field instrument module, a control module and an operation module, wherein the field instrument module is used for the equipment operation field data during gas unloading, pressurization, filling and pressure replenishment, and the control module is used to send control instructions to the operation module according to the equipment operation field data, and the operation module controls the operating status of the belonging equipment according to the control instructions.

Among them, it also includes a safety interlocking module connected to the control module, and the safety interlocking module includes emergency shut-off valves arranged at the inlets and outlets of the low-pressure compressor, the medium-pressure compressor, and the high-pressure storage tank, the medium-pressure storage tank, and the corresponding pipelines of the low-pressure storage tank. The emergency shut-off valves are used to cut off the corresponding pipelines of the high-pressure storage tank, the medium-pressure storage tank, and the low-pressure storage tank and issue danger warning information when any one of overpressure, leakage and flame alarms is detected.

The integrated hydrogen source hydrogenation station and control method and control system provided by the embodiment of the present invention have the following advantages compared with the prior art:

The integrated hydrogen source hydrogenation station is connected to the low-pressure compressor via medium- and high-pressure compressors instead of being directly connected to the hydrogen production system, so that the medium- and high-pressure compressors do not need to directly pressurize the hydrogen output by the hydrogen production system, but pressurize the hydrogen pressurized by the low-pressure compressor again and output it to at least one of the high-pressure storage tank and the medium-pressure storage tank for storage, thereby reducing the process of the medium- and high-pressure compressors pressurizing the hydrogen through the low-pressure compressor, reducing the actual pressurization time, and improving the pressurization efficiency.

The control method of the comprehensive hydrogen source hydrogenation station is connected with the low-pressure compressor through a medium and high pressure compressor, and after receiving the low-pressure hydrogen output by the low-pressure compressor, it is output to the medium-pressure storage tank or the high-pressure storage tank after pressurization treatment; after receiving the gas filling instruction, according to the gas pressure requirement of the vehicle to be filled with gas, the hydrogenation machine is controlled to first connect to the low-pressure storage tank for gas filling, and after disconnecting after reaching the first predetermined gas pressure, the hydrogenation machine is controlled to connect to the medium-pressure storage tank or the high-pressure storage tank for secondary gas filling until the expected gas pressure is reached. Due to the existence of low-pressure storage tanks, medium-pressure storage tanks and high-pressure storage tanks, the problem of not being easy to fill 35MPa and 70MPa high-pressure hydrogen at the same time is solved. In the gas filling process, the low-pressure storage tank is first used for low-pressure gas filling, and then the medium-pressure storage tank and the high-pressure storage tank are used for gas filling, so as to avoid starting from 0 in the process of filling the high-pressure storage tank, but from the output gas pressure position of the low-pressure storage tank, reducing the consumption of high-pressure gas, reducing the gas filling cost, and the gas filling gas pressure can be flexibly adapted, improving the gas filling efficiency.

The control system of the integrated hydrogen source hydrogenation station collects the equipment operation field data during the unloading, pressurization, filling and pressure replenishment processes through the field instrument module. The control module sends control instructions to the operation module according to the equipment operation field data, and the operation module controls the operation status of the corresponding equipment according to the control instructions. This makes the control of the entire refueling process a closed loop, making the control of the entire refueling process more precise, and improving the safety and reliability of the equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of an embodiment of a comprehensive hydrogen source hydrogenation station provided by an embodiment of the present invention;

FIG2 is a schematic diagram of a step flow chart of an embodiment of a comprehensive hydrogen source hydrogenation station control method provided by an embodiment of the present invention;

FIG3 is a schematic diagram of a step flow chart of an embodiment of a comprehensive hydrogen source hydrogenation station control system provided in an embodiment of the present invention.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Please refer to Figures 1-3, Figure 1 is a structural schematic diagram of an embodiment of an integrated hydrogen source hydrogenation station provided in an embodiment of the present invention; Figure 2 is a step flow diagram of an embodiment of a control method for an integrated hydrogen source hydrogenation station provided in an embodiment of the present invention; Figure 3 is a step flow diagram of an embodiment of a control system of an integrated hydrogen source hydrogenation station provided in an embodiment of the present invention.

In one embodiment, the integrated hydrogen source hydrogenation station includes a low-pressure compressor 2, a medium- and high-pressure compressor 3, a forward control panel 4, a high-pressure storage tank 7, a medium-pressure storage tank 6, a low-pressure storage tank 5 and a hydrogenation machine 8, wherein the low-pressure compressor 2 is connected to a hydrogen production system 9, and is used to receive the hydrogen output by the hydrogen production system 9, and then output it to the low-pressure storage tank 5 for storage after pressurization;

The medium- and high-pressure compressor 3 is connected to the low-pressure compressor 2, and is used to re-pressurize the hydrogen after the pressurization treatment of the low-pressure compressor 2 and output it to at least one of the high-pressure storage tank 7 and the medium-pressure storage tank 6 for storage;

The sequential control panel 4 is connected to the low-pressure storage tank 5, the high-pressure storage tank 7 and the medium-pressure storage tank 6, and the hydrogenator is connected to the low-pressure storage tank, the high-pressure storage tank and the medium-pressure storage tank. The sequential control panel is used to control the hydrogenator 8 to connect to at least one of the low-pressure storage tank 5, the high-pressure storage tank 7 and the medium-pressure storage tank 6 for gas filling operation according to the gas filling requirements in the received gas filling instruction.

The integrated hydrogen source hydrogenation station is connected to the low-pressure compressor 2 via the medium- and high-pressure compressors 3, but is not directly connected to the hydrogen production system 9, so that the medium- and high-pressure compressors 3 do not need to directly pressurize the hydrogen output by the hydrogen production system 9, but pressurize the hydrogen pressurized by the low-pressure compressor 2 again and output it to at least one of the high-pressure storage tank 7 and the medium-pressure storage tank 6 for storage, thereby reducing the process of the medium- and high-pressure compressors 3 pressurizing the hydrogen through the low-pressure compressor 2, reducing the actual pressurization time, and improving the pressurization efficiency.

The integrated hydrogen source hydrogen refueling station in the present application, although there is a hydrogen production system 9 for hydrogen production, the actual hydrogen produced may exceed the actual gas filling amount. At this time, the gas filling requirements can be met, but it may also be that the hydrogen production amount is less than the gas filling amount and cannot meet the gas filling needs, resulting in a lack of hydrogen and inability to refuel normally.

In order to solve this technical problem, in one embodiment, the integrated hydrogen source hydrogenation station also includes a gas unloading column 1, which is respectively connected to the low-pressure compressor 2 and the forward control panel 4. The hydrogen in the tube bundle vehicle is directly stored in the low-pressure storage tank 5 after being controlled by the forward control panel 4; or, the hydrogen in the tube bundle vehicle is pressurized by the low-pressure compressor 2 and the medium and high-pressure compressors 3, and then stored in the medium-pressure storage tank 6 or the high-pressure storage tank 7 through the forward control panel 4.

Since hydrogen is compressed by a compressor, it is common sense that gas compression will generate heat and cause the temperature to rise. It needs to be cooled to room temperature and then output to a hydrogen storage bottle group for storage or to a hydrogen refueling station for refueling. During the refueling stage, when hydrogen enters the on-board hydrogen cylinder from the hydrogen refueling machine, the temperature will rise due to the special coke effect of hydrogen. Due to material reasons, the allowable operating temperature of the on-board cylinder generally does not exceed 85 degrees Celsius.

It can be seen that whether it is the compression stage or the refueling stage, the temperature of hydrogen needs to be strictly controlled to avoid possible safety accidents.

In order to solve this technical problem, in one embodiment, the integrated hydrogen source hydrogenation station further includes a cooling device and a precooling heat exchanger 81 arranged on the hydrogenation machine 8, and the cooling device is connected to the low-pressure compressor 2, the medium- and high-pressure compressor 3, and the precooling heat exchanger 81.

Through the cooling system, it is connected with the low-pressure compressor 2 that releases heat, the medium- and high-pressure compressor 3, and the pre-cooling heat exchanger 81 of the hydrogenator 8, so as to cool the hydrogen after the compressor and pre-cool the hydrogen before the refueling operation, so as to ensure that the temperature of the hydrogen finally filled into the vehicle-mounted bottle is within a safe range, thereby improving the operating reliability of the equipment.

In addition, during the hydrogen filling process, sensors can be installed in the vehicle, such as sensors that monitor the temperature and pressure of hydrogen in the vehicle bottle, and then the data in the sensor can be transmitted to the hydrogen filling gun of the hydrogen filling station to adjust the hydrogen filling in real time. For example, if the temperature is too low or too high, the hydrogen filling rate can be appropriately reduced, or after the pressure reaches the expected pressure, the hydrogen filling rate can be appropriately reduced, or other methods can be used to adjust. The communication method can use Bluetooth, 4G, 5G, infrared and other methods to transmit information.

In one embodiment, the integrated hydrogen source hydrogenation station includes a gas unloading column 1, a low-pressure compressor 2, a medium- and high-pressure compressor 3, a sequential control panel 4, a hydrogen storage tank group 5, 6, and 7 with three pressure levels of low, medium, and high, and a hydrogenation machine 8 capable of dual pressure level filling, and a matching cooling system, station control system, and safety system. The relevant functions of the hydrogenation station can be realized through the design of relevant process pipelines and control logic.

Hydrogen refueling stations are equipped with hydrogen storage tanks of various pressure levels according to needs, which are used to adjust the refueling capacity of the station (especially the peak refueling capacity) and improve the refueling speed. In addition, hydrogen storage tanks of each pressure level can also be used in groups, and each group of hydrogen storage tanks is connected to a sequence control panel. The sequence control panel is composed of a combination of multiple pneumatic (or electric) control valves. By controlling the opening and closing of each valve on the sequence control panel, the flow direction of hydrogen in each pipeline and the switching of the sequence of each hydrogen storage tank are realized.

The hydrogenation device uses external hydrogen supply or in-station hydrogen production as the source of hydrogen. External hydrogen supply uses a long tube trailer to transport hydrogen. After the long tube trailer arrives at the station, the hydrogen is connected to the compressor system through the gas unloading column 1 and the pipeline, and is stored in the hydrogen storage tank in the station after being pressurized by the compressor. The hydrogen in the hydrogen storage tank is then used to refuel the fuel cell vehicle through the hydrogenation machine 8.

The hydrogen production pressure in the station is lower than the pressure of the external hydrogen supply trailer. A low-pressure compressor 2 is set at the end of the hydrogen production unit to increase the hydrogen pressure and input it into the low-pressure hydrogen storage tank or the medium- and high-pressure compressor 3 for secondary pressurization.

In addition, an embodiment of the present application also provides a comprehensive hydrogen source hydrogen refueling station control method.

In one embodiment, the integrated hydrogen source hydrogenation station control method includes:

S1, the low-pressure compressor is connected to the hydrogen production system and receives the hydrogen output by the hydrogen production system, and then outputs it to the low-pressure storage tank after pressurization;

S2, the medium- and high-pressure compressors are connected to the low-pressure compressor, and after receiving the low-pressure hydrogen output by the low-pressure compressor, the low-pressure hydrogen is output to the medium-pressure storage tank or the high-pressure storage tank after pressurization;

S3, after receiving the refueling instruction, according to the air pressure requirement of the vehicle to be refueled, control the hydrogen filling machine and the sequential control panel to first connect to the low-pressure storage tank for refueling, and after disconnecting after reaching the first predetermined air pressure, control the hydrogen filling machine and the sequential control panel to connect to the medium-pressure storage tank or the high-pressure storage tank for secondary refueling until the expected air pressure is reached.

It should be pointed out that the operating sequence in this embodiment is only one implementation method and should not be understood as a restriction on different hydrogenation, unloading and storage processes. The staff or users can flexibly adjust the operating sequence as needed, and some steps of Qizhen do not need to be executed in full. For example, during the refueling process, there is no need to consider the storage of hydrogen.

The control method of the comprehensive hydrogen source hydrogenation station is connected with the low-pressure compressor through a medium and high pressure compressor, and after receiving the low-pressure hydrogen output by the low-pressure compressor, it is output to the medium-pressure storage tank or the high-pressure storage tank after pressurization treatment; after receiving the gas filling instruction, according to the gas pressure requirement of the vehicle to be filled with gas, the hydrogenation machine is controlled to first connect to the low-pressure storage tank for gas filling, and after disconnecting after reaching the first predetermined gas pressure, the hydrogenation machine is controlled to connect to the medium-pressure storage tank or the high-pressure storage tank for secondary gas filling until the expected gas pressure is reached. Due to the existence of low-pressure storage tanks, medium-pressure storage tanks and high-pressure storage tanks, the problem of not being easy to fill 35MPa and 70MPa high-pressure hydrogen at the same time is solved. In the gas filling process, the low-pressure storage tank is first used for low-pressure gas filling, and then the medium-pressure storage tank and the high-pressure storage tank are used for gas filling, so as to avoid starting from 0 in the gas filling process of the high-pressure storage tank, but from the output gas pressure position of the low-pressure storage tank, reducing the consumption of high-pressure gas, reducing the gas filling cost, and the gas filling gas pressure can be flexibly adapted to improve the gas filling efficiency.

Although the hydrogen produced by the hydrogen production system of the present application may meet the current inflation needs, due to equipment failure or changes in customer sources, it may not be able to meet the current needs.

In order to solve this technical problem, in one embodiment, the integrated hydrogen source hydrogenation station control method further includes:

The hydrogen in the tube bundle vehicle is controlled by the sequential control panel and then stored in the low-pressure storage tank or the medium-pressure storage tank, or the hydrogen in the tube bundle vehicle is pressurized by the medium- and high-pressure compressors and then stored in the medium- and high-pressure storage tank.

By using tube bundle trucks to transport hydrogen, current refueling needs can be met.

It should be pointed out that in the present application, excess hydrogen in the current hydrogen refueling station can be transported out through a bundled vehicle, so that the hydrogen production system in the current hydrogen refueling station can operate continuously without pausing, thereby improving the operating efficiency of the equipment. By complementing each other, the hydrogen production work in each hydrogen refueling station can be almost unaffected.

In addition to the above methods, hydrogen can also be transported by pipeline, or by other means of transportation, similar to natural gas pipelines.

The operation process is as follows:

In one embodiment, the process of unloading hydrogen from an external supply vehicle is as follows: the hydrogen long-tube trailer enters the unloading position of the station area, fixes the vehicle and connects the gas unloading hose, unloads the hydrogen from the tube bundle vehicle through the gas unloading column and flow meter, and is transported to the rear-end sequential control panel through a compressor or direct charging to be distributed to the hydrogen storage tank or vehicle; when the hydrogen pressure in the long-tube trailer is lower than the set value, the gas unloading hose is disconnected, and the long-tube trailer leaves the station. When the hydrogen pressure in the long-tube trailer is low, the low-pressure compressor system can be connected to continue unloading hydrogen to improve the utilization rate of hydrogen in the trailer. If there are two long-tube trailers unloading at the same time, the system can select the start and stop of the corresponding gas unloading column according to the pressure in the long-tube trailer.

Although hydrogen can be replenished by using a tube bundle vehicle, after the charging operation is completed, due to the air pressure, such as the relatively high suction pressure requirement of the existing high-pressure hydrogen compressor, generally required to be (5-20MPa), the hydrogen that is not fully unloaded in the tube bundle vehicle is wasted, resulting in the problem of low hydrogen utilization rate.

In order to solve the above technical problems, in one embodiment, after S3, the integrated hydrogen source hydrogenation station control method further includes:

The low-pressure compressor is connected to the tube bundle vehicle, and the residual hydrogen after unloading the tube bundle vehicle is continuously extracted by the low-pressure compressor and then directly stored in the low-pressure storage tank after being pressurized, or the residual hydrogen after unloading the tube bundle vehicle is pressurized by the medium- and high-pressure compressors and then charged into the medium-pressure storage tank or the high-pressure storage tank.

In this application, the low-pressure compressor is used to continuously extract hydrogen from the tube bundle vehicle, so that the hydrogen in the tube bundle vehicle is completely unloaded to avoid waste. The hydrogen pressurized by the low-pressure compressor can be directly stored in a low-pressure storage tank, or it can continue to be filled into a medium- and high-pressure storage tank through a medium- and high-pressure compressor.

By extracting the residual hydrogen on the unloading rear side of the tube bundle vehicle and then pressurizing it, and storing it in the corresponding gas tank, the maximum utilization of the hydrogen in the tube bundle vehicle is achieved. On the one hand, the utilization efficiency of hydrogen is improved and the waste of hydrogen is reduced. On the other hand, it avoids the waste of gas caused by the discharge of residual hydrogen by the tube bundle vehicle, or the failure to discharge residual gas during the return process, which leads to a decrease in actual transportation efficiency. For example, in one transportation, 400 kg of hydrogen is transported, but due to the air pressure, the remaining 100 kg of hydrogen may remain, so the actual transportation volume is only 300 kg. If it is discharged directly, it will cause waste, and if it is returned directly, since it is also transporting hydrogen, there is also a high transportation risk. By adopting the above method, almost all of the hydrogen can be utilized, and there will be no transportation risk during the return process, which greatly improves the transportation efficiency and transportation safety.

The application does not limit the refueling process of the vehicle to be refueled. In order to improve the utilization efficiency of hydrogen, in one embodiment, after S3, the following steps are further included:

According to the hydrogen flow rate output by the hydrogen production system, the air pressure requirement of the vehicle to be refueled, and the current air pressure values of the low-pressure storage tank, the medium-pressure storage tank, and the high-pressure storage tank, the sequential control panel is controlled to selectively connect the low-pressure storage tank, the medium-pressure storage tank, and the high-pressure storage tank to the hydrogen filling machine to perform the refueling operation on the vehicle to be refueled.

By detecting the current gas pressure values of the low-pressure storage tank, the medium-pressure storage tank, and the high-pressure storage tank, flexible gas filling can be achieved according to the current gas filling needs and gas pressure values, thereby improving gas filling efficiency and reducing gas filling costs.

Furthermore, in order to achieve a flexible inflation process, after S3, it also includes:

A primary pressurization threshold of the low-pressure storage tank is set.

The present application does not impose any limitation on the primary pressurization threshold of the low-pressure storage tank, nor does it impose any limitation on the setting method thereof. It may be automatically adjusted according to the corresponding hydrogen storage tank gas pressure, or it may be manually set, and it may be set on-site or remotely.

The present application does not limit the value of the single pressurization threshold and the method for setting the single pressurization threshold. It can be set by manually entering the database to obtain data, or it can be set manually on site, or it can be set remotely. The present application does not limit this.

By adopting an intelligent refueling method, it is possible to more reasonably utilize gas sources with different pressures. For example, when there is less gas in the low-pressure tank, the amount of gas added can be reduced, and the use of the medium-pressure tank can be increased. Similarly, when there is less gas in the high-pressure tank, the amount used can be reduced and the amount used for other purposes can be increased, thereby more reasonably realizing the use of hydrogen from different gas sources and improving the utilization efficiency of hydrogen.

On the other hand, according to the actual gas storage volume, targeted operations can be carried out during the gas replenishment process. Moreover, according to the historical gas filling data, more reasonable gas filling rules can be formulated to improve the gas utilization efficiency.

In one embodiment, the pressurization process of the comprehensive hydrogen source hydrogenation station control method of the present application is as follows:

The hydrogen from the hydrogen production system or the gas unloading device enters the low-pressure compressor. After low-pressure compression, the hydrogen is pressurized by the medium and high-pressure compressors and cooled by the cooler. It goes to the sequential control panel. After being sequentially controlled by the sequential control panel, it enters the high, medium and low-pressure hydrogen storage containers for storage. The gas passing through the sequential control panel enters the higher-pressure storage tank first to maintain its high pressure. After filling to the target pressure, it is filled into the lower-pressure storage tank.

Unloading column pressurization path:

When unloading, the pressure of the tube bundle truck changes from high to low. The station control system controls the start and stop of corresponding equipment according to the pressure of the tube bundle truck and the tank pressure, and the unloading path changes accordingly.

1) Tube bundle car → gas unloading column → control panel → medium pressure (or low pressure) storage tank

2) Tube bundle car → gas unloading column → medium and high pressure compressor → forward control panel → medium pressure (or high pressure) storage tank

3) Tube bundle truck → gas unloading column → low-pressure compressor → low-pressure storage tank

Hydrogen production system pressurization path:

The outlet pressure of the hydrogen production system is relatively low. After the low-pressure compressor increases the pressure, it can only reach the pressure of the low-pressure storage tank. It needs to be pressurized again by the back-end medium and high-pressure compressors before it can enter a higher-pressure storage tank for storage.

4) Hydrogen production system → low-pressure compressor → low-pressure storage tank

5) Hydrogen production system → low-pressure compressor → high-pressure compressor → forward control panel → medium-pressure (or high-pressure) storage tank.

Different from other equipment, the medium and high pressure compressors installed in this equipment take into account the capabilities of both medium and high pressure compressors, and can output hydrogen at a pressure of 45MPa or 90MPa, so as to reduce the configuration of high pressure compressors and save costs. The hydrogen compressed by the medium and high pressure compressors and stored in the medium pressure 45MPa gas storage tank can continue to enter the medium and high pressure compressors again through the corresponding pipelines to increase the pressure to 90MPa and then be stored in the high pressure hydrogen storage tank.

6) Low-pressure storage tank → medium- and high-pressure compressors → forward control panel → medium-pressure storage tank;

7) Medium-pressure storage tank → Medium- and high-pressure compressors → forward control panel → high-pressure storage tank.

In one embodiment, the vehicle hydrogenation process is as follows:

The equipment is equipped with 35MPa and 70MPa hydrogen filling machines, or a hybrid hydrogen filling machine (35+70). After the hydrogen fuel cell vehicle is connected to the hydrogen filling machine, the hydrogen filling machine determines the specific gun type used through the gun raising signal of the connection gun, and determines the pressure level (35MPa, 70MPa) that the equipment needs to fill. As an additional option, the vehicle gas cylinder pressure level (35MPa, 70MPa) can also be read through the infrared communication device equipped with the hydrogen filling gun.

Before the hydrogen filling machine is started for formal filling, it will conduct a self-check of the equipment. After testing the connection status of the hydrogen filling machine and the leakage of the pipeline, it will send a filling request to the station control system. The station control system controls the sequence valve group to open in sequence to execute the filling process. The pressure in the vehicle-mounted gas cylinder gradually reaches the target pressure from low to high.

Phase 1: Direct charging process of the tube bundle vehicle. When the pressure of the tube bundle vehicle is higher than the pressure of the gas cylinder of the vehicle being filled, the equalized pressure direct charging process is started. Instead of using the hydrogen storage tank, the pressure difference between the tube bundle vehicle and the gas cylinder on the hydrogen fuel vehicle is used for filling, so as to reduce the energy consumption of the equipment.

Phase 2: Tank sequential hydrogenation process. Make full use of hydrogen storage containers to grade the gas cylinders on the vehicle, quickly add hydrogen to improve efficiency, and grade hydrogen storage and filling with low, medium and high level hydrogen storage containers.

The hydrogen refueling machine first draws gas from the low-pressure hydrogen storage container. When the pressure difference between the low-pressure hydrogen storage container and the pressure in the vehicle-mounted gas cylinder or the flow rate reaches the set value, it switches to the medium-pressure hydrogen storage container and starts to draw gas from the medium-pressure hydrogen storage container. When the pressure difference between the medium-pressure hydrogen storage container and the pressure in the vehicle-mounted gas cylinder or the flow rate reaches the set value, it switches to the high-pressure hydrogen storage container and starts to draw gas from the high-pressure hydrogen storage container.

Among them, if the on-board gas cylinder is of 35MPa level, the maximum pressure of the activated storage tank can be 45MPa. If the on-board gas cylinder is of 70MPa level, it is necessary to activate the 90MPa hydrogen storage tank for gas extraction and filling.

Phase 3 (optional): Compressor direct charging process. When the pressure of the highest pressure tank is not enough to fill the vehicle cylinder, the tank inlet and outlet valves are closed, and the hydrogen output by the compressor no longer enters the tank, but directly enters the vehicle cylinder through the sequential disk hydrogenation machine.

Stop taking gas until the target pressure required for the vehicle is reached or the pressure difference is too small and the flow rate is too low to reach the set value.

During the gas filling process, the high-pressure gas source may be insufficient. In this case, the storage tank with a lower pressure gas source can be pressurized to become a high-pressure gas source to improve the utilization efficiency. In one embodiment, the tank pressure replenishment process is as follows:

During the hydrogenation process, when the pressure of any of the high, medium and low pressure hydrogen storage containers is lower than the set value (adjustable), the medium and high pressure compressors start, and the hydrogen in the tube bundle vehicle is pressurized by the medium and high pressure compressors and then filled into the hydrogen storage container. The priority order of filling into the hydrogen storage container is high, medium and low, so as to ensure sufficient pressure difference to fill the gas cylinder.

The number of hydrogen refueling machines configured in the equipment depends on the needs. There is no limit to the number of hydrogen refueling guns for each hydrogen refueling machine, which can be a single gun or a double gun. According to the actual situation of the hydrogen refueling station, only two groups of hydrogen storage tanks can be set in the station, namely high and low pressure storage tanks, and the medium pressure storage tank can be cancelled. Each pressure level of the hydrogen storage tanks in the station can also be further grouped to achieve more graded filling and improve the utilization rate of hydrogen in the hydrogen storage tanks. The hydrogen refueling station of the present application can be either a fixed station or a skid-mounted hydrogen refueling station.

In addition, an embodiment of the present application also provides an integrated hydrogen source hydrogenation station control system, which is applied to the integrated hydrogen source hydrogenation station control method as described above, including a field instrument module 100, a control module 200 and an operation module 300, wherein the field instrument module 100 is used for the equipment operation field data during the unloading, pressurization, filling and pressure replenishment processes, and the control module 200 is used to send control instructions to the operation module according to the equipment operation field data, and the operation module 300 controls the operation status of the belonging equipment according to the control instructions.

The integrated hydrogen source hydrogenation station control system collects the equipment operation field data during the unloading, pressurization, filling and pressure replenishment processes through the field instrument module. The control module sends control instructions to the operation module according to the equipment operation field data, and the operation module controls the operation status of the corresponding equipment according to the control instructions. This makes the control of the entire refueling process a closed loop, making the control of the entire refueling process more precise, and improving the safety and reliability of the equipment.

The belonging device in the present application is not necessarily the device corresponding to the instrument in the field instrument module, but a device that can be controlled by the operation module 300, that is, the control command of the device can be generated through the data of the instrument downstream or upstream of the device, or the status of other related devices can be controlled.

Since the integrated hydrogen source hydrogen refueling station in this application uses hydrogen to refuel vehicles, once a gas leak occurs, accidents such as explosions are likely to occur. Therefore, it is necessary to ensure the operational safety of the hydrogen refueling station. In addition to the above-mentioned monitoring, it is also necessary to quickly control the corresponding equipment.

In order to achieve this technical effect, in one embodiment, the integrated hydrogen source hydrogenation station control system also includes a safety interlock module connected to the control module, and the safety interlock module includes emergency shut-off valves arranged at the inlets and outlets of the low-pressure compressor, the medium-pressure compressor, and the high-pressure storage tank, the medium-pressure storage tank, and the corresponding pipelines of the low-pressure storage tank, which are used to cut off the corresponding pipelines of the high-pressure storage tank, the medium-pressure storage tank, and the low-pressure storage tank and issue a danger warning message when any one of the overpressure, leakage and flame alarms is detected.

The above is a detailed introduction to the integrated hydrogen source hydrogenation station and its control method and control system provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims (6)

1. A comprehensive hydrogen source hydrogenation station, characterized in that it includes a low-pressure compressor, a medium- and high-pressure compressor, a forward control panel, a high-pressure storage tank, a medium-pressure storage tank, a low-pressure storage tank and a hydrogenation machine, wherein the low-pressure compressor is connected to a hydrogen production system, and is used to receive the hydrogen output by the hydrogen production system, and then output it to the low-pressure storage tank for storage after pressurization; The medium- and high-pressure compressor is connected to the low-pressure compressor, and is used to re-pressurize the hydrogen after the pressurization treatment by the low-pressure compressor and output it to at least one of the high-pressure storage tank and the medium-pressure storage tank for storage; The sequential control panel is connected to the low-pressure storage tank, the high-pressure storage tank and the medium-pressure storage tank, and the hydrogenator is connected to the low-pressure storage tank, the high-pressure storage tank and the medium-pressure storage tank respectively. The sequential control panel controls the hydrogenator to connect to at least one of the low-pressure storage tank, the high-pressure storage tank and the medium-pressure storage tank to perform a gas filling operation according to the received gas filling instruction; It also includes a gas unloading column, which is respectively connected to the low-pressure compressor and the forward control panel. The hydrogen in the tube bundle vehicle is directly stored in the low-pressure storage tank after being controlled by the forward control panel; or the hydrogen in the tube bundle vehicle is pressurized by the low-pressure compressor and the medium- and high-pressure compressors, and then stored in the medium-pressure storage tank or the high-pressure storage tank through the forward control panel; It also includes a cooling device and a pre-cooling heat exchanger arranged on the hydrogenator, and the cooling device is connected to the low-pressure compressor, the medium- and high-pressure compressors, and the pre-cooling heat exchanger. 2. A comprehensive hydrogen source hydrogenation station control method, characterized by comprising: The low-pressure compressor is connected to the hydrogen production system and receives the hydrogen output by the hydrogen production system, and then outputs it to the low-pressure storage tank after pressurization; The medium- and high-pressure compressors are connected to the low-pressure compressor, and after receiving the low-pressure hydrogen output by the low-pressure compressor, the low-pressure hydrogen is output to the medium-pressure storage tank or the high-pressure storage tank after pressurization treatment; After receiving the refueling instruction, according to the air pressure requirement of the vehicle to be refueled, the hydrogen filling machine and the control panel are controlled to first connect to the low-pressure storage tank for refueling, and disconnect after reaching the first predetermined air pressure, and control the hydrogen filling machine and the control panel to connect to the medium-pressure storage tank or the high-pressure storage tank for secondary refueling until the expected air pressure is reached; Also includes: The hydrogen in the tube bundle car is controlled by the sequential control panel and then stored in the low-pressure storage tank or the medium-pressure storage tank, or the hydrogen in the tube bundle car is pressurized by the medium- and high-pressure compressors and then stored in the medium- and high-pressure storage tank. 3. The integrated hydrogen source hydrogenation station control method according to claim 2, characterized in that it also includes: The low-pressure compressor is connected to the tube bundle vehicle, and the residual hydrogen after unloading the tube bundle vehicle is continuously extracted by the low-pressure compressor and then directly stored in the low-pressure storage tank after being pressurized, or the residual hydrogen after unloading the tube bundle vehicle is pressurized by the medium- and high-pressure compressors and then charged into the medium-pressure storage tank or the high-pressure storage tank. 4. The integrated hydrogen source hydrogenation station control method according to claim 3, characterized in that it also includes: According to the hydrogen flow rate output by the hydrogen production system, the air pressure requirement of the vehicle to be refueled, and the current air pressure values of the low-pressure storage tank, the medium-pressure storage tank, and the high-pressure storage tank, the sequential control panel is controlled to selectively connect the low-pressure storage tank, the medium-pressure storage tank, and the high-pressure storage tank to the hydrogen filling machine to perform the refueling operation on the vehicle to be refueled. 5. The integrated hydrogen source hydrogenation station control method according to claim 4, characterized in that it also includes: A primary pressurization threshold of the low-pressure storage tank is set. 6. A comprehensive hydrogen source hydrogenation station control system, characterized in that it is applied to the comprehensive hydrogen source hydrogenation station control method as described in any one of claims 2-5, comprising a field instrument module, a control module and an operation module, wherein the field instrument module is used to collect equipment operation field data during gas unloading, pressurization, filling and pressure replenishment, and the control module is used to send control instructions to the operation module according to the equipment operation field data, and the operation module controls the operation status of the equipment according to the control instructions; It also includes a safety interlock module connected to the control module, and the safety interlock module includes emergency shut-off valves arranged at the inlets and outlets of the low-pressure compressor, the medium-pressure compressor, and the corresponding pipelines of the high-pressure storage tank, the medium-pressure storage tank, and the low-pressure storage tank. The emergency shut-off valves are used to cut off the corresponding pipelines of the high-pressure storage tank, the medium-pressure storage tank, and the low-pressure storage tank and issue danger warning information when any dangerous state of overpressure, leakage and flame alarm is detected.