CN112050080A - Distributed control system, control method and measurement and control system for liquid hydrogen refueling station - Google Patents
Distributed control system, control method and measurement and control system for liquid hydrogen refueling station Download PDFInfo
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- CN112050080A CN112050080A CN202010961911.6A CN202010961911A CN112050080A CN 112050080 A CN112050080 A CN 112050080A CN 202010961911 A CN202010961911 A CN 202010961911A CN 112050080 A CN112050080 A CN 112050080A
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 207
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 207
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 186
- 239000007788 liquid Substances 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000005259 measurement Methods 0.000 title abstract description 11
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 84
- 238000012544 monitoring process Methods 0.000 claims abstract description 56
- 238000004891 communication Methods 0.000 claims abstract description 33
- 238000012806 monitoring device Methods 0.000 claims abstract description 30
- 230000008016 vaporization Effects 0.000 claims abstract description 28
- 230000002159 abnormal effect Effects 0.000 claims abstract description 27
- 238000009834 vaporization Methods 0.000 claims abstract description 24
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims description 48
- 239000007789 gas Substances 0.000 claims description 43
- 239000006200 vaporizer Substances 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 5
- 238000003745 diagnosis Methods 0.000 claims description 4
- 230000005856 abnormality Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000875 corresponding effect Effects 0.000 description 19
- 238000007726 management method Methods 0.000 description 15
- 230000001276 controlling effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013500 data storage Methods 0.000 description 2
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- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
- F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
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- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
- F17C13/123—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for gas bottles, cylinders or reservoirs for tank vehicles or for railway tank wagons
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- F17C2223/035—High pressure (>10 bar)
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- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
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- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
- F17C2260/042—Reducing risk of explosion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a distributed control system, a control method and a measurement and control system for a liquid hydrogen refueling station, wherein the control system comprises a master station system and a slave station system, the master station system comprises a station control system, and the slave station system comprises: the system comprises a liquid hydrogen storage device, a pump pressurization vaporization device, a high-pressure storage device, a hydrogenation unit, a safety monitoring device and a station control system, wherein the station control system is used for controlling a slave station system in a bus communication mode, monitoring and managing valves of a liquid hydrogen hydrogenation process system, storing data and inquiring data; the control method can simultaneously monitor each safety index of the liquid hydrogen hydrogenation process system in real time based on the control system, can give a fault alarm in time when any index is abnormal, and has high safety and reliability.
Description
Technical Field
The invention relates to the technical field of measurement and control, in particular to a distributed control system, a distributed control method and a distributed measurement and control system for a liquid hydrogen refueling station.
Background
The hydrogen station provides an infrastructure for supplying energy for hydrogen energy utilization equipment facilities such as a hydrogen energy fuel cell and the like, and is a precondition for popularization and application of a hydrogen energy fuel cell automobile and acceleration of development of a hydrogen energy industry. The liquid hydrogen storage is a storage mode of increasing the pressure of low-temperature liquid hydrogen, the volume hydrogen storage density of the liquid hydrogen increases along with the pressure increase under the high-pressure state, the volume hydrogen storage density increases from 70g/L to 100g/L after the liquid hydrogen pressure at the temperature of 253 ℃ below zero is increased from 0.1MPa to 45MPa, and the mass hydrogen storage density is thousands of times of the gas density. Compared with normal pressure liquid hydrogen storage, the hydrogen gas stored in the high pressure low temperature liquid hydrogen storage has small volatility and larger volume hydrogen storage density. Transferring the liquid hydrogen to a fixed liquid hydrogen container of a hydrogenation station by utilizing a tank truck transportation mode to serve as a material supply source of the hydrogenation station; the gas hydrogen adopts a tube bundle vehicle as a hydrogen supply source, low-pressure liquid hydrogen in a storage tank is pressurized to 45MPa by a liquid hydrogen pump, the low-pressure liquid hydrogen enters a vaporizer for phase change heat exchange to form high-pressure hydrogen, the hydrogen of the tube bundle vehicle is pressurized to 45MPa by a liquid driving booster pump to form high-pressure hydrogen, and the high-pressure hydrogen is buffered and temporarily stored by a hydrogen storage cylinder and then is hydrogenated to a fuel cell vehicle. The monitoring control of the whole system of the liquid hydrogen hydrogenation station is lacked in the prior art, so that the state of the whole process system of the hydrogenation station cannot be timely and effectively controlled, and the whole health operation and maintenance are not facilitated.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the monitoring control of the whole system of the liquid hydrogen refueling station is not lack and the whole healthy operation and maintenance is not facilitated in the prior art, so that the distributed control system, the control method and the measurement and control system of the liquid hydrogen refueling station are provided.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, a distributed control system for a liquid hydrogen refueling station comprises: the system of master website and slave station, the system of master website includes the station accuse system, and the slave station system includes: a liquid hydrogen storage device, a pump pressure-boosting vaporization device, a high-pressure storage device, a hydrogenation device and a safety monitoring device, wherein,
the station control system is used for controlling the slave station system in a bus communication mode, monitoring and managing a valve of the liquid hydrogen hydrogenation process system, and storing and inquiring data;
the liquid hydrogen storage device is used for storing liquid hydrogen and is used as a hydrogen supply source of the liquid hydrogen pump;
the pump pressurization vaporization device is used for carrying out pressurization vaporization on the high-pressure liquid hydrogen in the liquid hydrogen container;
the high-pressure storage device is used for storing high-pressure hydrogen and supplying the high-pressure hydrogen to the hydrogenation equipment;
the hydrogenation device is used for hydrogenating the hydrogen fuel automobile;
and the safety monitoring device is used for monitoring the state of the liquid hydrogen hydrogenation process system in real time and giving a fault alarm when an abnormality occurs.
In one embodiment, the liquid hydrogen storage device comprises a slave station controller, a liquid hydrogen container, a liquid level sensor and an electric valve, wherein the slave station controller is provided with a communication network interface and is communicated with the master station system through a preset communication protocol, so that the master station system can monitor the liquid hydrogen storage device in the whole process.
In one embodiment, a pump-pressurized vaporization apparatus, comprising: the controller is provided with a communication network interface and is communicated with a master station system through a preset communication protocol, so that the master station system carries out whole-process monitoring on the pump pressurization vaporization device.
In one embodiment, a high pressure storage device comprises: the system comprises a high-pressure hydrogen storage tank, a pressure sensor and an electric valve, wherein liquid hydrogen enters the hydrogen storage tank after being vaporized by a vaporizer, a master station PLC of a station control system of the high-pressure hydrogen storage system controls the electric valve of the high-pressure hydrogen storage tank, and the liquid hydrogen is distributed and supplied to a field hydrogenation system according to the hydrogen storage quantity obtained by the pressure sensor.
In one embodiment, the hydrotreater unit comprises: the electronic controller sends out a control instruction to control the electric valve according to hydrogen supply pressure and temperature, hydrogen is supplied through the hydrogenation gun, the display screen displays corresponding flow, temperature and pressure parameters, the electronic controller is provided with a network interface system, and the electronic controller is communicated with the main control system through a preset protocol to enable the main station system to monitor the hydrogenation device.
In one embodiment, the electronic controller controls automatic leak detection in the hydrogenation process, automatically stores current data and continues to prolong display if power is suddenly cut off in the hydrogenation process, completes settlement when hydrogenation is performed, displays hydrogenation amount in real time according to actual hydrogenation needs, accumulates flow, automatically stops hydrogenation when the preset pressure is added, and performs safety interlocking and automatic shutdown when abnormal states occur in the hydrogenation process.
In one embodiment, the safety monitoring device comprises a video monitoring device and a hydrogen safety monitoring device, wherein:
the video monitoring device includes: the system comprises a hard disk video recorder, an explosion-proof camera and a communication power supply circuit, wherein the hard disk video recorder is used for monitoring whether a liquid hydrogen storage device leaks or not, whether a pump pressurization vaporization device operates normally or not, whether a high-pressure storage device is safe or not, and the working state of hydrogenation equipment and the state of a nearby environment in real time;
the hydrogen safety monitoring device comprises an explosion-proof hydrogen concentration probe and an explosion-proof flame detector which are both arranged above the process system, monitoring data is connected into the main control system, the main control system displays corresponding monitoring data, and a grading alarm of hydrogen concentration and an abnormal flame signal alarm are carried out.
In a second aspect, an embodiment of the present invention provides a distributed control method for a liquid hydrogen refueling station, where the distributed control system for a liquid hydrogen refueling station is based on the first aspect, and includes: the master station system controls the liquid hydrogen storage device, the pump pressurization vaporization device, the high-pressure storage device, the hydrogenation unit device and the safety monitoring device of the slave station system at the same time, wherein:
the control process for the liquid hydrogen storage device includes: judging whether the main control system sends a signal for starting liquid hydrogen filling, if so, sequentially opening the manual control valve and the corresponding electromagnetic valve, monitoring whether the liquid level of the high-pressure hydrogen storage tank reaches a preset position, if so, sequentially closing the corresponding electromagnetic valve and the manual control valve, and if a signal for stopping liquid hydrogen filling is received in the process of liquid hydrogen filling, directly controlling to close the manual control valve;
the control process for the pump boosting vaporizing device comprises the following steps: after the running speed is preset, judging whether a main control system sends a signal for starting a cryogenic pump or not, if so, controlling the cryogenic pump to run stably, monitoring whether the state of the cryogenic pump is normal or not in the running process, if so, further monitoring whether the pressure at the outlet of a vaporizer is stable and normal or not, if so, opening a gas supply control valve, if receiving a signal for stopping the cryogenic pump sent by the main control system in the gas supply process, stopping supercharging, controlling to close the gas supply control valve, and if not, keeping the gas supply control valve in a closed state;
the control process for the high-pressure storage device includes: judging whether the master control system sends a gas supply starting signal, if so, sequentially opening the manual control valve and the corresponding electromagnetic valve, monitoring whether the pressure of the high-pressure hydrogen storage tank reaches a preset threshold value, if so, sequentially closing the corresponding electromagnetic valve and the manual control valve, and if a gas supply stopping signal sent by the master control system is received in the gas supply process, directly controlling to close the manual control valve;
the control process for the hydrogenation unit comprises the following steps: judging whether the main control system sends a starting signal for starting a hydrogenation gun or not, if so, opening the gas source control valve, and if a starting signal for stopping the hydrogenation gun is received in the hydrogenation process, closing the gas source control valve and stopping gas supply;
the control process for the safety monitoring device comprises the following steps: simultaneously monitoring whether the hydrogen concentration and the liquid level and the pressure of the high-pressure hydrogen storage tank exceed preset thresholds; whether the temperature and the pressure of the cryogenic pump are abnormal or not, and whether the pressure and the hydrogen concentration of the gas cylinder are normal or not; the hydrogenation pressure, the temperature and the hydrogen concentration are abnormal, and the state of the video monitoring equipment is abnormal; and sending out an alarm signal when at least one of the abnormal conditions is abnormal.
In a third aspect, an embodiment of the present invention provides a distributed measurement and control system for a liquid hydrogen refueling station, including: an information management system, a charging management system and a distributed control system of a liquid hydrogen refueling station according to the first aspect of the invention,
the information management system comprises a server and corresponding information management software, and performs process flow state display, key parameter curve display, alarm parameter display, video monitoring and equipment state monitoring by acquiring data acquired by the control system;
the charging management system measures, displays and settles the local gas filling amount through the data collected by the control system, and is also used for setting the gas filling amount and communicating with the hydrogenation unit.
The technical scheme of the invention has the following advantages:
1. the invention provides a distributed control system and a control method for a liquid hydrogen refueling station, wherein the control system comprises a master station system and a slave station system, the master station system comprises a station control system, and the slave station system comprises: the system comprises a liquid hydrogen storage device, a pump pressurization vaporization device, a high-pressure storage device, a hydrogenation unit, a safety monitoring device and a station control system, wherein the station control system is used for controlling a slave station system in a bus communication mode, monitoring and managing valves of a liquid hydrogen hydrogenation process system, storing data and inquiring data; the control method can simultaneously monitor each safety index of the liquid hydrogen hydrogenation process system in real time based on the control system, can give a fault alarm in time when any index is abnormal, and has high safety and reliability.
2. The invention provides a distributed measurement and control system of a liquid hydrogen refueling station, which comprises: the embodiment of the invention provides an information management system, a charging management system and a distributed control system for a liquid hydrogen hydrogenation station, which can carry out control, management and metering charging on a hydrogenation process, and ensure the safe and stable operation of the whole system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of a distributed control system of a liquid hydrogen refueling station in an embodiment of the present invention;
FIG. 2 is a communication connection diagram of a distributed control system of a liquid hydrogen refueling station provided in an embodiment of the present invention;
FIG. 3 is a flow chart of a distributed control method for a liquid hydrogen refueling station provided in an embodiment of the present invention;
fig. 4 is a frame diagram of a distributed measurement and control system of a liquid hydrogen refueling station provided in an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides a distributed control system for a liquid hydrogen refueling station, as shown in fig. 1, specifically comprising:
the system of master website and slave station, the system of master website includes the station accuse system, and the slave station system includes: a liquid hydrogen storage device, a pump pressure-boosting vaporization device, a high-pressure storage device, a hydrogenation device and a safety monitoring device, wherein,
and the station control system is used for controlling the slave station system in a bus communication mode, monitoring and managing valves of the liquid hydrogen hydrogenation process system, and storing and inquiring data. In the embodiment of the invention, the station control system comprises an engineer station, a master station PLC, network equipment and power supply equipment, wherein the master station PLC is installed in the engineer station, the network equipment and the power supply equipment are respectively used for communication and power supply of the master station PLC, the master station PLC monitors the pressure and temperature states of a hydrogen medium in real time, monitors the states of a valve and a pneumatic control valve, monitors the state parameters before and after the pump, records the times of opening and closing the pump and the valve, is used for fault diagnosis and equipment service life analysis, and sends alarm information when monitoring that the parameters are abnormal or faults occur.
In a specific embodiment, the station control system adopts domestic PLC-GCU521 equipment as a hardware platform, the equipment can include functions of CPU redundancy, communication network redundancy, power supply equipment redundancy and the like, and can have fault diagnosis and communication alarm functions, the GCU521 scanning period is 10ms, the equipment can be realized by communication devices COM521 and COM523, and communication protocols of Modbus RTU and Modbus TCP are supported, so that control over each device in the slave station system can be realized, monitoring and management of valves of each process system can be completed, and functions of data storage, data query and the like can be completed. The station control system is realized by adopting a domestic PLC-GCU521 controller, has the advantages of convenient programming, flexible use, high reliability, strong anti-interference capability and the like, is convenient to expand a hardware system in a device integration mode, can display each process flow chart and field process equipment state parameters in real time, can set alarm values and safety interlock control of each process system, can record current and previous alarm states, record curves, data reports and the like of each important parameter in real time, and is convenient to inquire data.
In the embodiment of the invention, a master station PLC of a station control system is provided with corresponding control management software, has a remote transmission interface, can realize remote data transmission and control through an optical fiber network, can adopt a domestic self-control software platform VxSCADA monitoring software and a configuration programming software, completes monitoring on a slave station system through the configuration programming, realizes the functions of realizing the data recording control flow, the safety chain and the like in the whole process from low-temperature liquid hydrogen at-253 ℃ to normal-temperature high-pressure gaseous hydrogen after pressurization and vaporization.
In the running process of monitoring software, the pressure and temperature states of a hydrogen medium are monitored in real time, the states of a valve and a pneumatic control valve are monitored, the state parameters before and after a pump are monitored, the times of opening and closing of the pump and the valve are recorded, the data parameters of the whole liquid hydrogen station system are subjected to data recording, data query and other functions through a data report function, the system can also be used for fault diagnosis and service life analysis, when the parameters are abnormal or faults occur, an audible and visual alarm is sent out, information is transmitted to the station control system, if the pressure value is abnormal, the pump or the valve is considered to be in fault, a fault processing program is started, and the corresponding control valve is opened and closed, so that the safety of.
The liquid hydrogen storage device is used for storing liquid hydrogen and is used as a hydrogen supply source of the liquid hydrogen pump; in the embodiment of the invention, the liquid hydrogen storage device comprises a slave station controller, a liquid hydrogen container, a liquid level sensor and an electric valve, wherein the slave station controller is provided with a communication network interface and is communicated with a master station system through a preset communication protocol, so that the master station system can monitor the liquid hydrogen storage device in the whole process.
In a specific embodiment, the slave station controller adopts a domestic GCU321 controller, a communication network interface is provided, a ModbusTCP communication protocol is supported, and a field valve can be controlled, so that a liquid inlet function from a liquid hydrogen container to a liquid hydrogen pump inlet is completed. The GCU321 controller communicates with the station control system through a Modbus TCP communication protocol, so that the whole-process monitoring function of the station control system on the liquid hydrogen storage system is realized.
The pump pressurization vaporization device is used for carrying out pressurization vaporization on the high-pressure liquid hydrogen in the liquid hydrogen container; in an embodiment of the present invention, a pump-pressurized vaporizing device comprises: the controller is provided with a communication network interface and is communicated with a master station system through a preset communication protocol, so that the master station system carries out whole-process monitoring on the pump pressurization vaporization device.
In a specific embodiment, the SMART200 controller is used for controlling the frequency converter to realize the motor speed regulation control function and realize the corresponding action of the plunger pump, thereby completing the liquid pressurization function, and then exchanging heat through the vaporizer to change into high-pressure gas. The SMART200 controller is provided with a Profinet network interface and supports a Modbus TCP communication protocol, so that the whole-process monitoring function of the station control system on the pump pressurization system is realized.
The high-pressure storage device is used for storing high-pressure hydrogen and supplying the high-pressure hydrogen to the hydrogenation equipment; in an embodiment of the present invention, a high pressure hydrogen storage system comprises: the system comprises a high-pressure hydrogen storage tank, a pressure sensor and an electric valve, wherein liquid hydrogen enters the hydrogen storage tank after being vaporized by a vaporizer, a master station PLC-GCU521 of a station control system of the high-pressure hydrogen storage system controls the electric valve of the high-pressure hydrogen storage tank through a digital analog I/O interface, and the liquid hydrogen is distributed and supplied to an on-site hydrogenation system according to the hydrogen storage amount obtained by the pressure sensor.
The hydrogenation device is used for hydrogenating the hydrogen fuel automobile; in an embodiment of the invention, a hydrotreater apparatus comprises: the electronic controller sends out a control instruction to control the electric valve according to hydrogen supply pressure and temperature, hydrogen is supplied through the hydrogenation gun, the display screen displays corresponding flow, temperature and pressure parameters, the electronic controller is provided with a network interface system, and the electronic controller is communicated with the main control system through a preset protocol to enable the main station system to monitor the hydrogenation device.
In a specific embodiment, the electronic controller adopts an embedded STM32 single chip microcomputer and is provided with a network interface device, the network interface supports modbus TCP communication protocol, communication with the station control system is realized, and the station control system completes implementation monitoring. The electronic controller controls the automatic leakage detection of the hydrogenation process, if the power is suddenly cut off in the hydrogenation process, the current data is automatically stored and continuously displayed in an extended mode, the settlement of the hydrogenation is completed when the time is up, the hydrogenation amount is displayed in real time according to the actual hydrogenation requirement, the flow is accumulated, the hydrogenation is automatically stopped when the preset pressure is filled, and the safety interlocking and the automatic shutdown are carried out when the abnormal state occurs in the hydrogenation process.
The safety monitoring device is used for monitoring the state of the liquid hydrogen hydrogenation process system in real time and giving a fault alarm when an abnormality occurs; the embodiment of the invention comprises a video monitoring device and a hydrogen safety monitoring device;
the video monitoring device mainly comprises a hard disk video recorder, an explosion-proof camera and a communication power supply circuit, has video storage and playback functions, can be used for observing key positions of the liquid hydrogen storage device, the pump pressurization vaporization device, the high-pressure hydrogen storage device and the hydrogenation device, and is used for monitoring whether the liquid hydrogen storage device leaks, whether the pump pressurization vaporization device normally operates, whether the high-pressure storage device is safe, the working state of the hydrogenation device and the nearby environment state in real time, and the safe and stable operation on site is ensured.
The hydrogen safety monitoring device is mainly characterized in that a hydrogen concentration probe, a flame detector hydrogen concentration probe and a flame detector are arranged above a process system and all adopt explosion-proof products, the output signal of the hydrogen concentration probe is 0-100% of the corresponding range of a 4-20mA current signal, monitoring data acquired by the hydrogen safety monitoring device is connected into a main control system, the main control system displays corresponding monitoring data, and a hierarchical alarm of hydrogen concentration and an abnormal alarm of a flame signal are carried out. As shown in fig. 2, the master PLC and each slave PLC are communicatively connected by a corresponding connection interface.
The distributed control system of the liquid hydrogen refueling station provided by the embodiment of the invention comprises a master station system and a slave station system, wherein the master station system comprises a station control system, and the slave station system comprises: liquid hydrogen storage device, pump pressure boost vapourizing unit, high-pressure storage device, hydrogenation machine device and safety monitoring device, the station accuse system for control to the slave station system through bus communication mode carries out the control and the management of liquid hydrogen hydrogenation process system's valve, carry out data storage, data query, it is convenient that this control system can realize data sharing, flexible control, scalability is strong, can support a plurality of hydrogenation stations monitor control simultaneously, carry out fault alarm when appearing unusually, security and reliability are high.
Example 2
The embodiment of the invention provides a distributed control method for a liquid hydrogen refueling station, based on the control system in embodiment 1, a master station system simultaneously controls a liquid hydrogen storage device, a pump pressurization vaporization device, a high-pressure storage device, a hydrogenation unit and a safety monitoring device of a slave station system, and the whole control flow is shown in fig. 3, wherein:
the control process for the liquid hydrogen storage device includes: judging whether the main control system sends a signal for starting liquid hydrogen filling, if so, sequentially opening the manual control valve and the corresponding electromagnetic valve, monitoring whether the liquid level of the high-pressure hydrogen storage tank reaches a preset position, if so, sequentially closing the corresponding electromagnetic valve and the manual control valve, and if a signal for stopping liquid hydrogen filling is received in the process of liquid hydrogen filling, directly controlling to close the manual control valve;
the control process for the pump boosting vaporizing device comprises the following steps: after the running speed is preset, judging whether a main control system sends a signal for starting a cryogenic pump or not, if so, controlling the cryogenic pump to run stably, monitoring whether the state of the cryogenic pump is normal or not in the running process, if so, further monitoring whether the pressure at the outlet of a vaporizer is stable and normal or not, if so, opening a gas supply control valve, if receiving a signal for stopping the cryogenic pump sent by the main control system in the gas supply process, stopping supercharging, controlling to close the gas supply control valve, and if not, keeping the gas supply control valve in a closed state;
the control process for the high-pressure storage device includes: judging whether the master control system sends a gas supply starting signal, if so, sequentially opening the manual control valve and the corresponding electromagnetic valve, monitoring whether the pressure of the high-pressure hydrogen storage tank reaches a preset threshold value, if so, sequentially closing the corresponding electromagnetic valve and the manual control valve, and if a gas supply stopping signal sent by the master control system is received in the gas supply process, directly controlling to close the manual control valve;
the control process for the hydrogenation unit comprises the following steps: judging whether the main control system sends a starting signal for starting a hydrogenation gun or not, if so, opening the gas source control valve, and if a starting signal for stopping the hydrogenation gun is received in the hydrogenation process, closing the gas source control valve and stopping gas supply;
the control process for the safety monitoring device comprises the following steps: simultaneously monitoring whether the hydrogen concentration, the liquid level and the pressure of the high-pressure hydrogen storage tank exceed preset thresholds; whether the temperature and the pressure of the cryogenic pump are abnormal or not, and whether the pressure and the hydrogen concentration of the gas cylinder are normal or not; the hydrogenation pressure, the temperature and the hydrogen concentration are abnormal, and the state of the video monitoring equipment is abnormal; and sending out an alarm signal when at least one of the abnormal conditions is abnormal.
The distributed control method for the liquid hydrogen hydrogenation station, provided by the embodiment of the invention, is based on the control system, can simultaneously monitor each safety index of the liquid hydrogen hydrogenation process system in real time, can timely perform fault alarm when any index is abnormal, and has high safety and reliability.
Example 3
The embodiment of the invention provides a distributed measurement and control system for a liquid hydrogen refueling station, as shown in fig. 4, comprising: an information management system, a charging management system and a distributed control system of a liquid hydrogen refueling station according to the first aspect of the invention,
the information management system comprises a server and corresponding information management software, and performs process flow state display, key parameter curve display, alarm parameter display, video monitoring and equipment state monitoring by acquiring data acquired by the control system; a user can realize remote control and monitoring of the process flow and the process equipment through a WEB browser.
The charging management system measures, displays and settles the local gas filling amount through the data collected by the control system, and is also used for setting the gas filling amount and communicating with the hydrogenation unit. The charging management system can support IC card charging, support receipt printing function, reserve internet access interface to provide tax printing and the like.
The distributed measurement and control system provided by the embodiment of the invention can carry out control, management, metering and charging on the hydrogenation process, and ensures the safe and stable operation of the whole system.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A distributed control system for a liquid hydrogen refueling station, comprising: the system of master website and slave station, the system of master website includes the station accuse system, and the slave station system includes: a liquid hydrogen storage device, a pump pressure-boosting vaporization device, a high-pressure storage device, a hydrogenation device and a safety monitoring device, wherein,
the station control system is used for controlling the slave station system in a bus communication mode, monitoring and managing a valve of the liquid hydrogen hydrogenation process system, and storing and inquiring data;
the liquid hydrogen storage device is used for storing liquid hydrogen and is used as a hydrogen supply source of the liquid hydrogen pump;
the pump pressurization vaporization device is used for carrying out pressurization vaporization on the high-pressure liquid hydrogen in the liquid hydrogen container;
the high-pressure storage device is used for storing high-pressure hydrogen and supplying the high-pressure hydrogen to the hydrogenation equipment;
the hydrogenation device is used for hydrogenating the hydrogen fuel automobile;
and the safety monitoring device is used for monitoring the state of the liquid hydrogen hydrogenation process system in real time and giving a fault alarm when an abnormality occurs.
2. The distributed control system of a liquid hydrogen refueling station as recited in claim 1, wherein the station control system comprises: engineer station, main website PLC, network equipment, power supply unit, install main website PLC in engineer station, network equipment and power supply unit are used for main website PLC respectively to communicate and the power supply, main website PLC real time monitoring hydrogen medium pressure, the temperature state, monitoring valve, gas accuse valve state, before the monitoring pump, behind the pump state parameter, record pump, the valve number of times of opening and shutting, be used for failure diagnosis and equipment life analysis, when the parameter is unusual or breaks down in the control, send alarm information.
3. The distributed control system of the liquid hydrogen refueling station as claimed in claim 2, wherein the liquid hydrogen storage device comprises a slave station controller, a liquid hydrogen container, a liquid level sensor and an electric valve, and the slave station controller is provided with a communication network interface and communicates with the master station system through a preset communication protocol, so that the master station system can monitor the liquid hydrogen storage device in the whole process.
4. The distributed control system of claim 2, wherein the pump-pressurized vaporization unit comprises: the controller is provided with a communication network interface and is communicated with a master station system through a preset communication protocol, so that the master station system carries out whole-process monitoring on the pump pressurization vaporization device.
5. The distributed control system of a liquid hydrogen hydrogenation station of claim 2, wherein the high pressure storage device comprises: the system comprises a high-pressure hydrogen storage tank, a pressure sensor and an electric valve, wherein liquid hydrogen enters the hydrogen storage tank after being vaporized by a vaporizer, a master station PLC of a station control system of the high-pressure hydrogen storage system controls the electric valve of the high-pressure hydrogen storage tank, and the liquid hydrogen is distributed and supplied to a field hydrogenation system according to the hydrogen storage quantity obtained by the pressure sensor.
6. The distributed control system of liquid hydrogen hydroprocessing stations of claim 2, wherein the hydroprocessing facility includes: the electronic controller sends out a control instruction to control the electric valve according to hydrogen supply pressure and temperature, hydrogen is supplied through the hydrogenation gun, the display screen displays corresponding flow, temperature and pressure parameters, the electronic controller is provided with a network interface system, and the electronic controller is communicated with the main control system through a preset protocol to enable the main station system to monitor the hydrogenation device.
7. The distributed control system of the liquid hydrogen refueling station as claimed in claim 6, wherein the electronic controller controls automatic leak detection in the hydrotreating process, automatically stores current data and continues to prolong display if power is suddenly cut off in the hydrotreating process, completes secondary hydrotreating settlement, displays the hydrotreating amount in real time according to actual hydrotreating needs, accumulates flow, automatically stops hydrotreating when the preset pressure is reached, and is safely interlocked and automatically stopped when abnormal conditions occur in the hydrotreating process.
8. The distributed control system of a liquid hydrogen refueling station as recited in claim 1, wherein the safety monitoring device comprises a video monitoring device and a hydrogen safety monitoring device, wherein:
the video monitoring device includes: the system comprises a hard disk video recorder, an explosion-proof camera and a communication power supply circuit, wherein the hard disk video recorder is used for monitoring whether a liquid hydrogen storage device leaks or not, whether a pump pressurization vaporization device operates normally or not, whether a high-pressure storage device is safe or not, and the working state of hydrogenation equipment and the state of a nearby environment in real time;
the hydrogen safety monitoring device comprises an explosion-proof hydrogen concentration probe and an explosion-proof flame detector which are both arranged above the process system, monitoring data is connected into the main control system, the main control system displays corresponding monitoring data, and a grading alarm of hydrogen concentration and an abnormal flame signal alarm are carried out.
9. A distributed control method of a liquid hydrogen hydrogenation station is based on the distributed control system of the liquid hydrogen hydrogenation station in any one of claims 1 to 8, and is characterized by comprising the following steps: the master station system controls the liquid hydrogen storage device, the pump pressurization vaporization device, the high-pressure storage device, the hydrogenation unit device and the safety monitoring device of the slave station system at the same time, wherein:
the control process for the liquid hydrogen storage device includes: judging whether the main control system sends a signal for starting liquid hydrogen filling, if so, sequentially opening the manual control valve and the corresponding electromagnetic valve, monitoring whether the liquid level of the high-pressure hydrogen storage tank reaches a preset position, if so, sequentially closing the corresponding electromagnetic valve and the manual control valve, and if a signal for stopping liquid hydrogen filling is received in the process of liquid hydrogen filling, directly controlling to close the manual control valve;
the control process for the pump boosting vaporizing device comprises the following steps: after the running speed is preset, judging whether a main control system sends a signal for starting a cryogenic pump or not, if so, controlling the cryogenic pump to run stably, monitoring whether the state of the cryogenic pump is normal or not in the running process, if so, further monitoring whether the pressure at the outlet of a vaporizer is stable and normal or not, if so, opening a gas supply control valve, if receiving a signal for stopping the cryogenic pump sent by the main control system in the gas supply process, stopping supercharging, controlling to close the gas supply control valve, and if not, keeping the gas supply control valve in a closed state;
the control process for the high-pressure storage device includes: judging whether the master control system sends a gas supply starting signal, if so, sequentially opening the manual control valve and the corresponding electromagnetic valve, monitoring whether the pressure of the high-pressure hydrogen storage tank reaches a preset threshold value, if so, sequentially closing the corresponding electromagnetic valve and the manual control valve, and if a gas supply stopping signal sent by the master control system is received in the gas supply process, directly controlling to close the manual control valve;
the control process for the hydrogenation unit comprises the following steps: judging whether the main control system sends a starting signal for starting a hydrogenation gun or not, if so, opening the gas source control valve, and if a starting signal for stopping the hydrogenation gun is received in the hydrogenation process, closing the gas source control valve and stopping gas supply;
the control process for the safety monitoring device comprises the following steps: simultaneously monitoring whether the hydrogen concentration and the liquid level and the pressure of the high-pressure hydrogen storage tank exceed preset thresholds; whether the temperature and the pressure of the cryogenic pump are abnormal or not, and whether the pressure and the hydrogen concentration of the gas cylinder are normal or not; the hydrogenation pressure, the temperature and the hydrogen concentration are abnormal, and the state of the video monitoring equipment is abnormal; and sending out an alarm signal when at least one of the abnormal conditions is abnormal.
10. The utility model provides a liquid hydrogen station distributing type system of observing and controling which characterized in that includes: an information management system, a charge management system, and a distributed control system for a liquid hydrogen refueling station according to any one of claims 1 to 8,
the information management system comprises a server and corresponding information management software, and performs process flow state display, key parameter curve display, alarm parameter display, video monitoring and equipment state monitoring by acquiring data acquired by the control system;
the charging management system measures, displays and settles the local gas filling amount through the data collected by the control system, and is also used for setting the gas filling amount and communicating with the hydrogenation unit.
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| CN112050080B (en) | 2022-05-24 |
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