CN114593366B - Monitoring system and monitoring method for hydrogen leakage of hydrogen station - Google Patents

Monitoring system and monitoring method for hydrogen leakage of hydrogen station Download PDF

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Publication number
CN114593366B
CN114593366B CN202210506156.1A CN202210506156A CN114593366B CN 114593366 B CN114593366 B CN 114593366B CN 202210506156 A CN202210506156 A CN 202210506156A CN 114593366 B CN114593366 B CN 114593366B
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hydrogen
valve
pipeline body
mass flow
fluctuation
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CN114593366A (en
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刘洪涛
李煦侃
刘韬
周慎学
朱松强
张志宇
王峰
周雨轩
沈晓露
潘尘
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Zhejiang Zheneng Aerospace Hydrogen Energy Technology Co ltd
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Zhejiang Zheneng Aerospace Hydrogen Energy Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/065—Arrangements for producing propulsion of gases or vapours
    • F17D1/07—Arrangements for producing propulsion of gases or vapours by compression
    • 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
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • 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
    • F17C13/04—Arrangement or mounting of valves
    • 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
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • 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
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • 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
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/012—Hydrogen
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/036—Control means using alarms
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0447—Composition; Humidity
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/45—Hydrogen technologies in production processes

Abstract

The invention relates to the technical field of hydrogen monitoring of a hydrogen station, in particular to a hydrogen leakage monitoring system and a hydrogen leakage monitoring method for the hydrogen station. The utility model provides a monitored control system that hydrogen of hydrogenation station leaked, includes the pipeline subassembly, including locating the first pipeline body of unloading the inside of gas module, locates the second pipeline body of pressure boost module inside, locates the third pipeline body of filling the inside of module, connects the first pipeline body with the fourth pipeline body of the second pipeline body, and connect the fifth pipeline body of the second pipeline body and third pipeline body. The hydrogen leakage detection device can perform comprehensive hydrogen leakage detection on the whole hydrogen pipeline through the first mass flow meter, the second mass flow meter and the mass flow difference calculation unit in the hydrogenation process so as to preliminarily judge whether the hydrogen pipeline has hydrogen leakage signs; specific hydrogen leakage positions can be quickly found through the first mass flow meter, the second mass flow meter, the first hydrogen abnormal fluctuation detection unit and the second hydrogen abnormal fluctuation detection unit in the shutdown process.

Description

Monitoring system and monitoring method for hydrogen leakage of hydrogen station
Technical Field
The invention relates to the technical field of hydrogen monitoring of a hydrogen station, in particular to a hydrogen leakage monitoring system and a hydrogen leakage monitoring method for the hydrogen station.
Background
The hydrogen is a sustainable and environment-friendly green energy source, and has the characteristics of wide source, high combustion heat value, cyclic utilization, various storage modes and the like. With the development and implementation of hydrogen fuel cell projects in various countries, infrastructures such as hydrogenation stations matched with the hydrogen fuel cell projects are required to be rapidly developed. However, because hydrogen has the characteristics of low density, large diffusion coefficient, low ignition temperature, wide explosion limit (volume fraction of 4-74%), high combustion flame speed and the like, if hydrogen leaks in a hydrogenation station, explosion or detonation is easily caused, and huge casualties and property loss are caused.
In the prior art, a hydrogen station usually adopts methods such as a hydrogen concentration detector and a flame detector to detect hydrogen leakage, but the hydrogen concentration detector and the flame detector can only detect hydrogen leakage when the hydrogen leakage amount is large. In addition, the hydrogen concentration detector and the flame detector can only detect the fixed areas provided with the hydrogen concentration detector and the flame detector, cannot perform comprehensive coverage detection on the hydrogen pipelines of the whole hydrogen station, and cannot determine the specific position of hydrogen leakage.
Disclosure of Invention
The invention provides a hydrogen leakage monitoring system and a hydrogen leakage monitoring method for a hydrogen station, aiming at the problems in the prior art, and the system and the method can detect the hydrogen leakage problem under the condition of less hydrogen leakage amount, can perform comprehensive hydrogen leakage detection on the whole hydrogen pipeline of the hydrogen station, and can also determine the specific position of hydrogen leakage.
The technical scheme adopted by the invention for solving the technical problems is as follows: a monitoring system for hydrogen leakage of a hydrogen station comprises
The pipeline assembly is connected with the gas unloading module, the pressurizing module and the filling module;
the valve component is arranged on the pipeline component;
the first mass flow meter is arranged on the pipeline assembly and used for acquiring a first mass flow value of hydrogen in the hydrogenation process of the hydrogenation station and acquiring a first hydrogen fluctuation value in the shutdown process of the hydrogenation station;
the second mass flow meter is arranged on the pipeline assembly and used for acquiring a second mass flow value of hydrogen in the hydrogenation process of the hydrogenation station and acquiring a second hydrogen fluctuation value in the shutdown process of the hydrogenation station;
the controller is connected with the first mass flow meter, the second mass flow meter and the valve assembly and is provided with a data analysis module; the data analysis module comprises
The mass flow difference calculating unit is used for calculating the mass flow difference of the hydrogen according to the first mass flow value and the second mass flow value in the hydrogenation process of the hydrogenation station;
the first hydrogen abnormal fluctuation detection unit is used for determining whether the first mass flowmeter has fluctuation abnormity or not through the first hydrogen fluctuation value in the shutdown process of the hydrogenation station;
the second hydrogen abnormal fluctuation detection unit is used for determining whether the second mass flowmeter has fluctuation abnormity or not according to the second hydrogen fluctuation value in the shutdown process of the hydrogenation station;
the alarm device is connected with the controller and alarms when the mass flow difference value reaches a first preset value;
the display is connected with the controller, is provided with a display screen for displaying the pipeline component and the valve component, and carries out color distinguishing and labeling on the pipeline body with hydrogen leakage.
Preferably, the pipeline assembly comprises a first pipeline body arranged inside the gas discharging module, a second pipeline body arranged inside the pressurizing module, a third pipeline body arranged inside the filling module, a fourth pipeline body connecting the first pipeline body and the second pipeline body, and a fifth pipeline body connecting the second pipeline body and the third pipeline body;
the valve component comprises a first valve arranged at a first port of the first pipeline body, a second valve arranged at a second port of the first pipeline body, a third valve arranged on the fourth pipeline body, a fourth valve arranged at a first port of the second pipeline body, a fifth valve arranged at a second port of the second pipeline body, a sixth valve arranged on the fifth pipeline body, a seventh valve arranged at a first port of the third pipeline body, and an eighth valve arranged at a second port of the third pipeline body;
the first mass flowmeter is arranged on the first pipeline body and is positioned between the first valve and the second valve;
the second mass flow meter is arranged on the third pipeline body and is positioned between the seventh valve and the eighth valve.
Preferably, the monitoring system further comprises a timing triggering unit connected to the controller, and when any one valve of the valve assembly is closed and the waiting time after the corresponding valve is closed reaches a second preset value, the timing triggering unit triggers the first hydrogen abnormal fluctuation detection unit and/or the second hydrogen abnormal fluctuation detection unit to start.
Preferably, the monitoring system further comprises a hydrogen concentration detector, which is arranged near the fourth pipeline body and the fifth pipeline body, is connected with the controller, and is used for detecting the hydrogen concentration in the air and giving an alarm when the hydrogen concentration detected by the hydrogen concentration detector exceeds a third preset value.
Preferably, the fourth pipeline body is provided with a plurality of third valves; the fifth pipeline body is provided with a plurality of sixth valves; the fourth pipeline body reaches the fifth pipeline body all includes many pipeline sections, two adjacent pipeline sections's junction is equipped with hydrogen sensitive sticky tape.
The monitoring method for hydrogen leakage of the hydrogen station comprises the following steps
L11, in the hydrogenation process of the hydrogenation station, acquiring a first mass flow value through a first mass flow meter, and acquiring a second mass flow value through a second mass flow meter;
l12, calculating a mass flow difference value between the first mass flow value and the second mass flow value through a mass flow difference calculation unit, and alarming through an alarm device when the mass flow difference value reaches a first preset value; otherwise, return to L11;
an L13 worker manually enters a hydrogen leakage positioning program according to the alarm information;
wherein the hydrogen leakage localization procedure specifically comprises the following steps
L21 closes the gas unloading module, the pressurization module and the filling module to stop the hydrogenation station;
l22 closes the first valve and the eighth valve, the first hydrogen abnormal fluctuation detection unit determines whether the first mass flowmeter has fluctuation abnormality or not through the first hydrogen fluctuation value, meanwhile, the second hydrogen abnormal fluctuation detection unit determines whether the second mass flowmeter has fluctuation abnormality or not through the second hydrogen fluctuation value, and when the first mass flowmeter and the second mass flowmeter do not have fluctuation abnormality, the hydrogen leakage positioning program exits; otherwise, go to L31;
l31, closing a fourth valve and a fifth valve on the second pipeline body, determining whether the first mass flowmeter has fluctuation abnormity through the first hydrogen fluctuation value by the first hydrogen abnormal fluctuation detection unit, determining whether the second mass flowmeter has fluctuation abnormity through the second hydrogen fluctuation value by the second hydrogen abnormal fluctuation detection unit, and entering L32 when the first mass flowmeter has fluctuation abnormity; when the second mass flowmeter has fluctuation abnormity, entering L33; when the first mass flow meter and the second mass flow meter have no fluctuation abnormity and indicate that the hydrogen leakage position is on the pipeline body between the fourth valve and the fifth valve, carrying out color distinguishing and labeling on the corresponding pipeline body through the display, and exiting the hydrogen leakage positioning program;
l32 closes the valve adjacent to the valve closed last time, the first hydrogen abnormal fluctuation detection unit determines whether the first mass flowmeter has fluctuation abnormality through the first hydrogen fluctuation value, when the first mass flowmeter has no fluctuation abnormality, the first mass flowmeter indicates that the hydrogen leakage position is on the pipeline body between the valve closed last time and the valve closed last time, the corresponding pipeline body is subjected to color distinguishing and labeling through the display, and the hydrogen leakage positioning program exits; when the first mass flow meter has fluctuation abnormity and the secondary closed valve is adjacent to the first valve, indicating that the hydrogen leakage position is on the pipeline body between the secondary closed valve and the first valve, carrying out color distinguishing and marking on the corresponding pipeline body through a display, and exiting the hydrogen leakage positioning program; otherwise, L32 is repeated;
l33 closes the valve adjacent to the valve closed last time, the second hydrogen abnormal fluctuation detection unit determines whether the second mass flowmeter has fluctuation abnormality through the second hydrogen fluctuation value, when the second mass flowmeter has no fluctuation abnormality, the hydrogen leakage position is indicated on the pipeline body between the valve closed last time and the valve closed last time, the corresponding pipeline body is subjected to color distinguishing marking through the display, and the hydrogen leakage positioning program exits; when the second mass flow meter has abnormal fluctuation and the secondary closed valve is adjacent to the eighth valve, the hydrogen leakage position is shown on the pipeline body between the secondary closed valve and the eighth valve, the corresponding pipeline body is subjected to color distinguishing and marking through the display, and the hydrogen leakage positioning program is quitted; otherwise, L33 is repeated.
Preferably, the monitoring method further includes that when any one valve of the valve assemblies is closed and the waiting time reaches a second preset value after the corresponding valve is closed, the timing triggering unit triggers the first hydrogen abnormal fluctuation detection unit and/or the second hydrogen abnormal fluctuation detection unit to start.
Preferably, the monitoring method further comprises the steps of detecting the hydrogen concentration in the air near the fourth pipeline body and the fifth pipeline body through a hydrogen concentration detector, and alarming when the hydrogen concentration detected by the hydrogen concentration detector exceeds a third preset value;
in the L13, when the alarm device and the hydrogen concentration detector alarm at the same time, a worker immediately and manually enters a hydrogen leakage positioning program according to the alarm information; when the alarm device gives an alarm but the hydrogen concentration detector does not give an alarm, the worker waits for the completion of the secondary hydrogenation operation according to the alarm information and then manually enters a hydrogen leakage positioning program.
Preferably, the monitoring method further comprises the step of arranging a plurality of third valves on the fourth pipeline body according to the actual length of the fourth pipeline body; and a plurality of sixth valves are arranged on the fifth pipeline body according to the actual length of the fifth pipeline body.
Preferably, the monitoring method further comprises the step of arranging a hydrogen sensitive adhesive tape on the fourth pipeline body or the fifth pipeline body, and when the hydrogen leakage position is on the fourth pipeline body or the fifth pipeline body, finding the specific hydrogen leakage position is assisted by the hydrogen sensitive adhesive tape.
Advantageous effects
The monitoring system and the monitoring method can perform comprehensive hydrogen leakage detection on the whole hydrogen pipeline through the first mass flow meter, the second mass flow meter and the mass flow difference calculating unit in the hydrogenation process so as to preliminarily judge whether the hydrogen pipeline has hydrogen leakage signs; the hydrogen leakage detection device can comprehensively detect the whole hydrogen pipeline through the first mass flow meter, the second mass flow, the first hydrogen abnormal fluctuation detection unit and the second hydrogen abnormal fluctuation detection unit in the shutdown process so as to determine whether the hydrogen pipeline really leaks hydrogen or not and quickly find out a specific hydrogen leakage position.
Drawings
FIG. 1 is a schematic view of the connection of piping and valve components of a monitoring system according to the present invention;
FIG. 2 is a schematic diagram of the structure of the monitoring system according to the present invention;
FIG. 3 is a schematic flow diagram of a portion of a hydrogen leak monitoring method for a hydrogen refueling station according to the present invention;
FIG. 4 is a schematic flow diagram of a second part of the hydrogen leak monitoring method for a hydrogen refueling station according to the present invention;
FIG. 5 is a schematic flow diagram of part three of the hydrogen leak monitoring method for a hydrogen refueling station according to the present invention;
FIG. 6 is a schematic flow diagram of part four of the hydrogen leak monitoring method of a hydrogen refueling station of the present invention;
FIG. 7 is a schematic flow diagram of a fifth portion of a hydrogen leak monitoring method for a hydrogen refueling station according to the present invention;
FIG. 8 is a schematic flow diagram of part six of the hydrogen leak monitoring method for a hydrogen refueling station of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example 1: as shown in fig. 1 and 2, a hydrogen leakage monitoring system for a hydrogen refueling station comprises a pipeline assembly, a valve assembly, a first mass flow meter, a second mass flow meter, a controller, an alarm device and a display.
The pipeline assembly comprises a first pipeline body arranged inside the gas unloading module, a second pipeline body arranged inside the pressurizing module, a third pipeline body arranged inside the filling module, a fourth pipeline body and a fifth pipeline body, wherein the third pipeline body is connected with the first pipeline body and the fourth pipeline body, and the fifth pipeline body is connected with the second pipeline body and the third pipeline body.
The hydrogen filling module is used for filling the pressurized hydrogen for the automobile, namely the hydrogen firstly passes through the first pipeline body inside the gas filling module during hydrogenation, then passes through the fourth pipeline body outside, then passes through the second pipeline body inside the pressurizing module, then passes through the fifth pipeline body outside, and finally fills the third pipeline body inside the module. In addition, the first pipeline body, the second pipeline body, the third pipeline body, the fourth pipeline body and the fifth pipeline body are assembled by a plurality of pipeline sections. The number of the pipeline sections formed by the first pipeline body, the second pipeline body and the third pipeline body is small (2 or 3 pipelines can be provided), and the number of the pipeline sections formed by the fourth pipeline body and the fifth pipeline body is large (6 or 10 pipelines can be provided, and the number can be determined according to actual use requirements).
The valve component comprises a first valve arranged at a first port of the first pipeline body, a second valve arranged at a second port of the first pipeline body, a third valve arranged on the fourth pipeline body, a fourth valve arranged at a first port of the second pipeline body, a fifth valve arranged at a second port of the second pipeline body, a sixth valve arranged on the fifth pipeline body, a seventh valve arranged at a first port of the third pipeline body and an eighth valve arranged at a second port of the third pipeline body; the first port of the first pipeline body is used for being connected with a hydrogen source, and the second port of the third pipeline body is used for being connected with a filling gun.
The first valve is an air unloading module hydrogen inlet valve, the second valve is an air unloading module hydrogen outlet valve, the fourth valve is a pressurizing module hydrogen inlet valve, the fifth valve is a pressurizing module hydrogen outlet valve, the seventh valve is an filling module hydrogen inlet valve, and the eighth valve is a filling module hydrogen outlet valve. In addition, a plurality of third valves may be provided to the fourth piping body, and a plurality of sixth valves may be provided to the fifth piping body.
The first mass flow meter is arranged on the first pipeline body and located between the first valve and the second valve, and is used for acquiring a first mass flow value of hydrogen in the hydrogenation process of the hydrogenation station and acquiring a first hydrogen fluctuation value in the shutdown process of the hydrogenation station.
The second mass flow meter is arranged on the third pipeline body, is positioned between the seventh valve and the eighth valve, and is used for acquiring a second mass flow value of hydrogen in the hydrogenation process of the hydrogenation station and acquiring a second hydrogen fluctuation value in the shutdown process of the hydrogenation station.
The controller is connected with the first mass flow meter, the second mass flow meter, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve and the eighth valve, and is provided with a data analysis module. The controller can acquire a first mass flow value and a second mass flow value of the first mass flow meter, and can acquire a second mass flow value and a second hydrogen fluctuation value of the second mass flow meter.
The data analysis module inside the controller comprises a mass flow difference calculation unit, a first hydrogen abnormal fluctuation detection unit and a second hydrogen abnormal fluctuation detection unit.
The mass flow difference calculating unit can calculate the mass flow difference of the hydrogen according to the first mass flow value and the second mass flow value in the hydrogenation process of the hydrogenation station. In the hydrogenation process of the hydrogenation station, the mass flow difference always fluctuates within a fixed difference range under normal conditions; when hydrogen leakage occurs in the hydrogen pipeline, the mass flow difference exceeds a normal difference fluctuation range (namely, a first preset value). Specifically, the first preset value can be obtained by first calculating according to the formula (1)
Figure 469825DEST_PATH_IMAGE001
And is calculated by the formula (2)
Figure 761129DEST_PATH_IMAGE002
，
Figure 746272DEST_PATH_IMAGE003
（1）
Wherein the content of the first and second substances,
Figure 148434DEST_PATH_IMAGE001
is a theoretical value of the difference value of the mass flow of the hydrogen in the pipeline between the hydrogen source and the pressurizing module (namely the upstream pipeline) in the time period t in the hydrogenation process,
Figure 286154DEST_PATH_IMAGE004
is the real-time pressure value of the hydrogen in the upstream pipeline in the time period t,
Figure 732048DEST_PATH_IMAGE005
the pressure value of the hydrogen in the upstream pipe at the start of the time period t,
Figure 689640DEST_PATH_IMAGE006
is an upstream pipelineThe volume of (a) to (b),
Figure 895493DEST_PATH_IMAGE007
is a coefficient of proportionality that is,
Figure 871408DEST_PATH_IMAGE008
is the real-time temperature value of the hydrogen in the upstream pipeline in the time period t,
Figure 770094DEST_PATH_IMAGE009
the temperature value of the hydrogen in the upstream pipe at the beginning of the time period t.
Figure 480561DEST_PATH_IMAGE010
（2）
Wherein the content of the first and second substances,
Figure 224526DEST_PATH_IMAGE011
is a theoretical value of the difference value of the mass flow of the hydrogen in the pipeline between the pressurizing module and the filling gun (namely the downstream pipeline) in the hydrogenation process in the same time period t,
Figure 323457DEST_PATH_IMAGE012
is the real-time pressure value of the hydrogen in the downstream pipeline in the same time period t,
Figure 127465DEST_PATH_IMAGE013
the pressure value of the hydrogen in the downstream pipeline at the beginning of the same time period t,
Figure 325228DEST_PATH_IMAGE014
is the volume of the downstream pipe or pipes,
Figure 856572DEST_PATH_IMAGE015
is a coefficient of proportionality that is,
Figure 557812DEST_PATH_IMAGE016
is the real-time temperature value of the hydrogen in the downstream pipeline in the same time period t,
Figure 532721DEST_PATH_IMAGE017
the temperature value of the hydrogen in the downstream pipeline at the beginning of the same time period t.
Then, it is calculated by the formula (3)
Figure 201469DEST_PATH_IMAGE018
，
Figure 552816DEST_PATH_IMAGE019
（3）
Wherein, the first and the second end of the pipe are connected with each other,
Figure 108562DEST_PATH_IMAGE018
the theoretical value of the mass flow difference in the whole hydrogen pipeline in the time period t in the hydrogenation process is shown. Then, the first preset value is
Figure 769220DEST_PATH_IMAGE020
Wherein
Figure 675996DEST_PATH_IMAGE021
Is a fixed parameter value which can be determined by historical data and experience, and is specifically set on a display by a worker.
In addition, assume that the first mass flow rate value obtained by the first mass flow meter is
Figure 565454DEST_PATH_IMAGE022
The second mass flow rate value obtained by the second mass flow meter is
Figure 772445DEST_PATH_IMAGE023
Then, the mass flow difference calculation unit calculates the actual mass flow difference of the hydrogen gas obtained in the hydrogenation process of the hydrogenation station
Figure 354736DEST_PATH_IMAGE024
Can be obtained by the formula (4), specifically
Figure 723707DEST_PATH_IMAGE025
（4）
Then, when
Figure 416857DEST_PATH_IMAGE024
Greater than a first predetermined value
Figure 212774DEST_PATH_IMAGE020
In this case, it can be determined that hydrogen leakage has occurred in the hydrogen pipe.
The first hydrogen abnormal fluctuation detection unit can determine whether the first mass flow meter has fluctuation abnormality or not through the first hydrogen fluctuation value during the shutdown of the hydrogenation station. The second hydrogen abnormal fluctuation detection unit can determine whether the second mass flowmeter has fluctuation abnormality or not through the second hydrogen fluctuation value during the shutdown process of the hydrogenation station. During the shutdown of the hydrogen plant, the first mass flow meter and the second mass flow meter are not fluctuated or fluctuate within a very small fluctuation range under normal conditions (i.e. the first hydrogen fluctuation value and the second hydrogen fluctuation value are very small); when hydrogen leakage occurs in the hydrogen pipeline, the first mass flow meter and the second mass flow meter can obviously fluctuate (namely the first hydrogen fluctuation value and the second hydrogen fluctuation value can become larger). The first hydrogen abnormality fluctuation detection unit may determine that there is a fluctuation abnormality in the first mass flow meter when the first hydrogen fluctuation value exceeds a set fluctuation value; the second hydrogen abnormality fluctuation detection unit may determine that there is a fluctuation abnormality in the second mass flow meter when the second hydrogen fluctuation value exceeds a set fluctuation value, which may be obtained by history-related data analysis.
And the alarm device is connected with the controller and alarms when the mass flow difference value reaches a first preset value. The alarm device can be an audible and visual alarm, and the audible and visual alarm reminds workers that the hydrogen pipeline has the possibility of air leakage. The worker needs to manually enter the hydrogen leakage location program, for example, press a button for hydrogen leakage location.
The display with the controller is connected, is equipped with and is used for showing the pipeline subassembly with the display screen of valve subassembly, and carry out the colour differentiation mark to the pipeline body of hydrogen leakage. The display can show the connection schematic diagram of the first pipeline body, the second pipeline body, the third pipeline body, the fourth pipeline body, the fifth pipeline body, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve and the eighth valve through the display screen. When monitored control system determined that it was the pipeline body between two valves that hydrogen appears to leak, the display can be red with the pipeline body mark that corresponds (other pipeline bodies can be green) to make things convenient for the staff to know the position of the pipeline body that hydrogen leaked fast.
Further, the monitoring system further comprises a timing triggering unit. The timing triggering unit is connected with the controller, and when any one valve of the valve assembly is closed and the waiting time reaches a second preset value after the corresponding valve is closed, the first hydrogen abnormal fluctuation detection unit and/or the second hydrogen abnormal fluctuation detection unit are triggered to start.
The second preset value may be 1 minute, for example, after the first valve and the eighth valve are closed, the first hydrogen abnormal fluctuation detecting unit and the second hydrogen abnormal fluctuation detecting unit wait for 1 minute and then compare the first hydrogen fluctuation value (or the second hydrogen fluctuation value) with the set fluctuation value to determine whether there is a fluctuation abnormality in the first mass flow meter (or the second mass flow meter). The timing trigger unit can eliminate the influence of valve closing on the first mass flow meter and the second mass flow meter, so that the detection results of the first hydrogen abnormal fluctuation detection unit and the second hydrogen abnormal fluctuation detection unit are more accurate.
Supposing that the whole hydrogen pipeline of the hydrogen filling station is in the initial assembly stage, all pipeline bodies are normally connected, after long-term use, the joints of certain pipeline sections and the pipeline sections can be loosened, so that the hydrogen leakage phenomenon occurs in the pipeline bodies, but once the hydrogen leakage phenomenon occurs in a certain pipeline body, the pipeline body can be immediately maintained to be normal, so that the monitoring system of the embodiment defaults that only one pipeline body (namely the pipeline between two adjacent valves) can have hydrogen leakage at the same time, and only one pipeline body needs to be found when specific hydrogen leakage is positioned.
In this embodiment, it is assumed that only one third valve is disposed on the fourth pipeline body, and only one sixth valve is disposed on the fifth pipeline body. The specific monitoring process for monitoring hydrogen leakage of the system is as follows:
in the hydrogenation process of the hydrogenation station, a first mass flow value is obtained through a first mass flow meter, and a second mass flow value is obtained through a second mass flow meter. And then, calculating a mass flow difference value between the first mass flow value and the second mass flow value through a mass flow difference calculation unit, and if the mass flow difference value reaches a first preset value, alarming through an alarm device to enable a worker to know that the hydrogen pipeline possibly has a hydrogen leakage risk. After the worker obtains the alarm information of the alarm device, the worker manually presses the hydrogen leakage positioning button to enter a hydrogen leakage positioning program. In addition, the monitoring system further comprises a hydrogen concentration detector. The hydrogen concentration detector is arranged near the fourth pipeline body and the fifth pipeline body, is connected with the controller and is used for detecting the hydrogen concentration in the air and giving an alarm when the hydrogen concentration detected by the hydrogen concentration detector exceeds a third preset value. If the worker only obtains the alarm information of the alarm device, the hydrogen leakage condition of the pipeline is not serious, and the worker can manually press the hydrogen leakage positioning button to enter a hydrogen leakage positioning program after the completion of the next hydrogenation operation. If the alarm information of the alarm device and the alarm information of the hydrogen concentration detector are obtained, the situation of hydrogen leakage is serious, and a worker needs to immediately manually press a hydrogen leakage positioning button to enter a hydrogen leakage positioning program. If the hydrogenation station is not in hydrogenation operation, the hydrogen concentration detector gives an alarm, and a worker needs to immediately and manually press a hydrogen leakage positioning button to enter a hydrogen leakage positioning program.
The specific hydrogen leakage positioning procedure is as follows: and closing the gas unloading module, the pressurizing module and the filling module to stop the hydrogenation station. And then closing the first valve and the eighth valve, after waiting for 1 minute, determining whether the first mass flowmeter has fluctuation abnormity through the first hydrogen fluctuation value by the first hydrogen abnormal fluctuation detection unit, determining whether the second mass flowmeter has fluctuation abnormity through the second hydrogen fluctuation value by the second hydrogen abnormal fluctuation detection unit, and when the first mass flowmeter and the second mass flowmeter do not have fluctuation abnormity, indicating that the hydrogen is not leaked, exiting the hydrogen leakage positioning program.
When the first mass flow meter and the second mass flow meter have fluctuation abnormity, the fourth valve and the fifth valve on the second pipeline body are closed, after 1 minute of waiting, the first hydrogen abnormity fluctuation detection unit determines whether the first mass flow meter has fluctuation abnormity through the first hydrogen fluctuation value, and meanwhile, the second hydrogen abnormity fluctuation detection unit determines whether the second mass flow meter has fluctuation abnormity through the second hydrogen fluctuation value.
In case 1, when there is a fluctuation abnormality in the first mass flow meter, a position indicating leakage of hydrogen gas is between the first valve and the fourth valve. Then, only the third valve needs to be closed firstly, after 1 minute of waiting, the first hydrogen abnormal fluctuation detection unit determines whether the first mass flow meter has fluctuation abnormality or not through the first hydrogen fluctuation value, and when the first mass flow meter has no fluctuation abnormality, the hydrogen leakage position can be determined to be on the pipeline body between the third valve and the fourth valve, and then color distinguishing and labeling can be carried out on the corresponding pipeline body through the display, and the hydrogen leakage positioning program is quitted; when the first mass flow meter has fluctuation abnormity, the hydrogen leakage position is indicated on the pipeline body between the first valve and the third valve, and the second valve needs to be continuously closed. After the second valve is closed, waiting for 1 minute, determining whether the first mass flow meter has abnormal fluctuation or not by the first hydrogen abnormal fluctuation detection unit through the first hydrogen fluctuation value, and when the first mass flow meter has no abnormal fluctuation, determining that the hydrogen leakage position is on the pipeline body between the second valve and the third valve, performing color distinguishing and labeling on the pipeline body with hydrogen leakage through the display, and exiting the hydrogen leakage positioning program; when the first mass flowmeter has fluctuation abnormality, the hydrogen leakage position can be determined on the pipeline body between the first valve and the second valve, the pipeline body with the hydrogen leakage can be distinguished and marked by colors through the display, and the hydrogen leakage positioning program is quitted.
In case 2, when the second mass flow meter has a fluctuation abnormality, the position indicating the leakage of hydrogen gas is between the fifth valve and the eighth valve. Then, only the sixth valve needs to be closed, after 1 minute of waiting, the second hydrogen abnormal fluctuation detection unit determines whether the second mass flow meter has abnormal fluctuation or not through the second hydrogen fluctuation value, and when the second mass flow meter has no abnormal fluctuation, the hydrogen leakage position is determined to be on the pipeline body between the fifth valve and the sixth valve, the corresponding pipeline body can be subjected to color distinguishing and labeling through the display, and the hydrogen leakage positioning program exits; when the second mass flowmeter has fluctuation abnormity, the hydrogen leakage position is indicated on the pipeline body between the sixth valve and the eighth valve, and the seventh valve needs to be continuously closed. After the seventh valve is closed, waiting for 1 minute, determining whether the second mass flow meter has abnormal fluctuation or not by the second hydrogen abnormal fluctuation detection unit through the second hydrogen fluctuation value, and when the second mass flow meter has no abnormal fluctuation, determining that the hydrogen leakage position is on the pipeline body between the sixth valve and the seventh valve, performing color distinguishing and labeling on the pipeline body with hydrogen leakage through the display, and exiting the hydrogen leakage positioning program; when the second mass flow meter has fluctuation abnormality, the hydrogen leakage position can be determined to be on the pipeline body between the seventh valve and the eighth valve, the pipeline body with the hydrogen leakage can be distinguished and marked in color through the display, and the hydrogen leakage positioning program is quitted.
And 3, when the first mass flow meter and the second mass flow meter have no fluctuation abnormity, the hydrogen leakage position is shown on the pipeline body between the fourth valve and the fifth valve, the corresponding pipeline body is subjected to color distinguishing and labeling through the display, and the hydrogen leakage positioning program is quitted.
After the hydrogen leakage positioning program is finished, the staff can know the hydrogen leakage which specifically appears in the pipeline body between which two valves through the display, and then make things convenient for the staff to maintain corresponding pipeline body.
Furthermore, the fourth pipeline body and the fifth pipeline body both comprise a plurality of pipeline sections, and hydrogen sensitive adhesive tapes are arranged at the joints of the adjacent two pipeline sections. Because the fourth pipeline body and the fifth pipeline body are relatively long, if only one third valve is arranged on the fourth pipeline body, even if the hydrogen leakage position is known to be between the second valve and the third valve, the specific hydrogen leakage position is difficult to find (the fifth pipeline body is the same), so that the embodiment arranges a plurality of valves on the fourth pipeline body and the fifth pipeline body to reduce the range of one pipeline body (namely the pipeline between the two valves), thereby facilitating the staff to find the specific hydrogen leakage position quickly. In addition, a pipeline body is also formed by connecting a plurality of pipeline sections, and the hydrogen sensitive adhesive tape is arranged at the joint of the two pipeline sections to assist workers to quickly find out a specific hydrogen leakage position.
The monitoring system of the embodiment can perform comprehensive hydrogen leakage detection on the whole hydrogen pipeline through the first mass flow meter, the second mass flow meter and the mass flow difference calculating unit in the hydrogenation process so as to preliminarily judge whether the hydrogen pipeline has hydrogen leakage signs; the hydrogen leakage detection device can comprehensively detect the whole hydrogen pipeline through the first mass flow meter, the second mass flow, the first hydrogen abnormal fluctuation detection unit and the second hydrogen abnormal fluctuation detection unit in the shutdown process so as to determine whether the hydrogen pipeline really leaks hydrogen or not and quickly find out a specific hydrogen leakage position.
Example 2: as shown in fig. 3 to 8 (where line end a in fig. 3 is connected to line end a in fig. 4, line end B in fig. 4 is connected to line end B in fig. 5, line end C in fig. 4 is connected to line end C in fig. 6, line end D in fig. 4 is connected to line end D in fig. 7, line end E in fig. 5 is connected to line end E in fig. 8, line end F in fig. 6 is connected to line end F in fig. 8, and line end G in fig. 7 is connected to line end G in fig. 8), a monitoring method for hydrogen leakage in a hydrogen refueling station is implemented by using the monitoring system in embodiment 1, which specifically includes the following steps
L11, obtaining a first mass flow value through the first mass flow meter and obtaining a second mass flow value through the second mass flow meter during the hydrogen adding process of the hydrogen adding station. The first mass flow meter is arranged on the first pipeline body, is positioned between the first valve and the second valve, and is used for acquiring a first mass flow value of hydrogen in the hydrogenation process of the hydrogenation station and acquiring a first hydrogen fluctuation value in the shutdown process of the hydrogenation station. The second mass flow meter is arranged on the third pipeline body, is positioned between the seventh valve and the eighth valve, and is used for acquiring a second mass flow value of hydrogen in the hydrogenation process of the hydrogenation station and acquiring a second hydrogen fluctuation value in the shutdown process of the hydrogenation station.
L12, calculating a mass flow difference value between the first mass flow value and the second mass flow value through a mass flow difference calculation unit, and alarming through an alarm device when the mass flow difference value reaches a first preset value; otherwise, return to L11. In the hydrogenation process of the hydrogenation station, the mass flow difference always fluctuates within a fixed difference range under normal conditions; when hydrogen leakage occurs in the hydrogen pipeline, the mass flow difference exceeds a normal difference fluctuation range (namely, a first preset value), wherein the first preset value can be obtained through historical relevant data analysis. The alarm device can be an audible and visual alarm, and reminds workers through the audible and visual alarm, so that the hydrogen pipeline has the possibility of air leakage.
And the L13 staff manually enters a hydrogen leakage positioning program according to the alarm information. After the worker obtains the alarm information of the alarm device, the worker manually presses the hydrogen leakage positioning button to enter a hydrogen leakage positioning program. In addition, the monitoring system further comprises a hydrogen concentration detector. The hydrogen concentration detector is arranged near the fourth pipeline body and the fifth pipeline body, is connected with the controller and is used for detecting the hydrogen concentration in the air and giving an alarm when the hydrogen concentration detected by the hydrogen concentration detector exceeds a third preset value. If the worker only obtains the alarm information of the alarm device, the hydrogen leakage condition of the pipeline is not serious, and the worker can manually press the hydrogen leakage positioning button to enter a hydrogen leakage positioning program after the completion of the next hydrogenation operation. If the alarm information of the alarm device and the alarm information of the hydrogen concentration detector are obtained, the situation of hydrogen leakage is serious, and a worker needs to immediately manually press a hydrogen leakage positioning button to enter a hydrogen leakage positioning program. If the hydrogenation station is not in hydrogenation operation, the hydrogen concentration detector gives an alarm, and a worker needs to immediately and manually press a hydrogen leakage positioning button to enter a hydrogen leakage positioning program.
Wherein the hydrogen leakage localization procedure specifically comprises the following steps
L21 closes the blowdown module, pressurization module and fill module, taking the hydrogen station out of service.
L22 closes the first valve and the eighth valve, the first hydrogen abnormal fluctuation detection unit determines whether the first mass flow meter has fluctuation abnormity through the first hydrogen fluctuation value, meanwhile, the second hydrogen abnormal fluctuation detection unit determines whether the second mass flow meter has fluctuation abnormity through the second hydrogen fluctuation value, and when the first mass flow meter and the second mass flow meter have no fluctuation abnormity, the hydrogen leakage positioning program exits; otherwise, L31 is entered.
The monitoring method further comprises the step that when any one valve of the valve components is closed and the waiting time reaches a second preset value after the corresponding valve is closed, the timing triggering unit triggers the first hydrogen abnormal fluctuation detection unit and/or the second hydrogen abnormal fluctuation detection unit to start. For this purpose, L22 may wait 1 minute after closing the first valve and the eighth valve, and determine whether there is a fluctuation abnormality in the first mass flow meter and the second mass flow meter after 1 minute. The method can eliminate the influence of valve closing on the first mass flow meter and the second mass flow meter, so that the detection results of the first hydrogen abnormal fluctuation detection unit and the second hydrogen abnormal fluctuation detection unit are more accurate.
L31, closing a fourth valve and a fifth valve on the second pipeline body, determining whether the first mass flowmeter has fluctuation abnormity through the first hydrogen fluctuation value by the first hydrogen abnormal fluctuation detection unit, determining whether the second mass flowmeter has fluctuation abnormity through the second hydrogen fluctuation value by the second hydrogen abnormal fluctuation detection unit, and entering L32 when the first mass flowmeter has fluctuation abnormity; when the second mass flow meter has fluctuation abnormity, entering L33; when the first mass flow meter and the second mass flow meter do not have fluctuation abnormity, the hydrogen leakage position is indicated on the pipeline body between the fourth valve and the fifth valve, color distinguishing and marking are carried out on the corresponding pipeline body through the display, and the hydrogen leakage positioning program is quitted.
Assuming that all pipeline bodies are normally connected in the initial assembly stage of the whole hydrogen pipeline of the hydrogen filling station, after long-term use, the joints of certain pipeline sections and the pipeline sections can be loosened, so that the hydrogen leakage phenomenon occurs in the pipeline bodies, but once the hydrogen leakage phenomenon occurs in a certain pipeline body, the pipeline body is immediately maintained to be normal, so that the monitoring method of the embodiment defaults that only one pipeline body (namely the pipeline between two adjacent valves) can have hydrogen leakage at the same time. At this time, the first mass flow meter has no fluctuation abnormity, which indicates that no hydrogen leakage occurs in the pipeline between the first valve and the fourth valve; similarly, the second mass flow meter has no fluctuation abnormity, which indicates that no hydrogen leakage occurs in the pipeline between the fifth valve and the eighth valve; therefore, it is possible to determine the location of the hydrogen gas leak on the pipe body between the fourth valve and the fifth valve.
L32 closes the valve adjacent to the valve closed last time, the first hydrogen abnormal fluctuation detection unit determines whether the first mass flowmeter has fluctuation abnormality or not through the first hydrogen fluctuation value, when the first mass flowmeter has no fluctuation abnormality, the first mass flowmeter indicates that the hydrogen leakage position is on the pipeline body between the valve closed last time and the valve closed last time, the corresponding pipeline body is subjected to color distinguishing marking through the display, and the hydrogen leakage positioning program exits; when the first mass flow meter has abnormal fluctuation and the secondary closed valve is adjacent to the first valve, indicating that the hydrogen leakage position is on the pipeline body between the secondary closed valve and the first valve, carrying out color distinguishing and marking on the corresponding pipeline body through a display, and exiting the hydrogen leakage positioning program; otherwise, L32 is repeated.
If only one third valve is arranged on the fourth pipeline body, L32 specifically includes closing the third valve, waiting for 1 minute, determining whether the first mass flow meter has fluctuation abnormality by the first hydrogen abnormal fluctuation detection unit through the first hydrogen fluctuation value, determining that the hydrogen leakage position is on the pipeline body between the third valve and the fourth valve when the first mass flow meter has no fluctuation abnormality, performing color distinguishing and labeling on the corresponding pipeline body through the display, and exiting the hydrogen leakage positioning procedure; when the first mass flow meter has fluctuation abnormity, the hydrogen leakage position is indicated on the pipeline body between the first valve and the third valve, and the second valve needs to be continuously closed. After the second valve is closed, waiting for 1 minute, determining whether the first mass flow meter has abnormal fluctuation or not by the first hydrogen abnormal fluctuation detection unit through the first hydrogen fluctuation value, and when the first mass flow meter has no abnormal fluctuation, determining that the hydrogen leakage position is on the pipeline body between the second valve and the third valve, performing color distinguishing and labeling on the pipeline body with hydrogen leakage through the display, and exiting the hydrogen leakage positioning program; when the first mass flowmeter has fluctuation abnormality, the hydrogen leakage position can be determined on the pipeline body between the first valve and the second valve, the pipeline body with the hydrogen leakage can be distinguished and marked by colors through the display, and the hydrogen leakage positioning program is quitted.
L33 closes the valve adjacent to the valve closed last time, the second hydrogen abnormal fluctuation detection unit determines whether the second mass flowmeter has fluctuation abnormality through the second hydrogen fluctuation value, when the second mass flowmeter has no fluctuation abnormality, the hydrogen leakage position is indicated on the pipeline body between the valve closed last time and the valve closed last time, the corresponding pipeline body is subjected to color distinguishing marking through the display, and the hydrogen leakage positioning program exits; when the second mass flow meter has abnormal fluctuation and the secondary closed valve is adjacent to the eighth valve, the hydrogen leakage position is shown on the pipeline body between the secondary closed valve and the eighth valve, the corresponding pipeline body is subjected to color distinguishing and marking through the display, and the hydrogen leakage positioning program is quitted; otherwise, L33 is repeated.
If only one sixth valve is arranged on the fifth pipeline body, L33 specifically includes closing the sixth valve, waiting for 1 minute, determining whether the second mass flow meter has fluctuation abnormality through the second hydrogen fluctuation value by the second hydrogen abnormal fluctuation detection unit, determining that the hydrogen leakage position is on the pipeline body between the fifth valve and the sixth valve when the second mass flow meter has no fluctuation abnormality, performing color distinguishing labeling on the corresponding pipeline body through the display, and exiting the hydrogen leakage positioning procedure; when the second mass flowmeter has fluctuation abnormity, the hydrogen leakage position is indicated on the pipeline body between the sixth valve and the eighth valve, and the seventh valve needs to be continuously closed. After the seventh valve is closed, waiting for 1 minute, determining whether the second mass flow meter has abnormal fluctuation or not by the second hydrogen abnormal fluctuation detection unit through the second hydrogen fluctuation value, and when the second mass flow meter has no abnormal fluctuation, determining that the hydrogen leakage position is on the pipeline body between the sixth valve and the seventh valve, performing color distinguishing and labeling on the pipeline body with hydrogen leakage through the display, and exiting the hydrogen leakage positioning program; when the second mass flow meter has fluctuation abnormality, the hydrogen leakage position can be determined to be on the pipeline body between the seventh valve and the eighth valve, the pipeline body with the hydrogen leakage can be distinguished and marked in color through the display, and the hydrogen leakage positioning program is quitted.
After the hydrogen leakage positioning program is finished, the staff can know the hydrogen leakage which specifically appears in the pipeline body between which two valves through the display, and then make things convenient for the staff to maintain corresponding pipeline body.
Further, the monitoring method of the embodiment further includes setting a plurality of third valves on the fourth pipeline body according to the actual length of the fourth pipeline body; and a plurality of sixth valves are arranged on the fifth pipeline body according to the actual length of the fifth pipeline body. And a hydrogen sensitive adhesive tape is arranged on the fourth pipeline body or the fifth pipeline body, and when the hydrogen leakage position is on the fourth pipeline body or the fifth pipeline body, the specific hydrogen leakage position is found by the aid of the hydrogen sensitive adhesive tape.
Because the fourth pipeline body and the fifth pipeline body are relatively long, if only one third valve is arranged on the fourth pipeline body, even if the hydrogen leakage position is known to be between the second valve and the third valve, the specific hydrogen leakage position is difficult to find (the fifth pipeline body is the same), so that the embodiment arranges a plurality of valves on the fourth pipeline body and the fifth pipeline body to reduce the range of one pipeline body (namely the pipeline between the two valves), thereby facilitating the staff to find the specific hydrogen leakage position quickly. In addition, a pipeline body is also formed by connecting a plurality of pipeline sections, and the hydrogen sensitive adhesive tape is arranged at the joint of the two pipeline sections to assist workers to quickly find out a specific hydrogen leakage position.
According to the monitoring method, in the hydrogenation process, comprehensive hydrogen leakage detection can be performed on the whole hydrogen pipeline through the first mass flow meter, the second mass flow meter and the mass flow difference calculation unit so as to preliminarily judge whether the hydrogen pipeline has hydrogen leakage signs; the hydrogen leakage detection device can comprehensively detect the whole hydrogen pipeline through the first mass flow meter, the second mass flow, the first hydrogen abnormal fluctuation detection unit and the second hydrogen abnormal fluctuation detection unit in the shutdown process so as to determine whether the hydrogen pipeline really leaks hydrogen or not and quickly find out a specific hydrogen leakage position.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.

Claims (9)

1. A monitoring system for hydrogen leakage of a hydrogen station is characterized in that: comprises that
The pipeline assembly is connected with the gas unloading module, the pressurizing module and the filling module; the pipeline assembly comprises a first pipeline body arranged in the gas unloading module, a second pipeline body arranged in the pressurizing module, a third pipeline body arranged in the filling module, a fourth pipeline body connected with the first pipeline body and the second pipeline body, and a fifth pipeline body connected with the second pipeline body and the third pipeline body;
the valve component is arranged on the pipeline component; the valve component comprises a first valve arranged at a first port of the first pipeline body, a second valve arranged at a second port of the first pipeline body, a third valve arranged on the fourth pipeline body, a fourth valve arranged at a first port of the second pipeline body, a fifth valve arranged at a second port of the second pipeline body, a sixth valve arranged on the fifth pipeline body, a seventh valve arranged at a first port of the third pipeline body, and an eighth valve arranged at a second port of the third pipeline body;
the first mass flow meter is arranged on the pipeline assembly and used for acquiring a first mass flow value of hydrogen in the hydrogenation process of the hydrogenation station and acquiring a first hydrogen fluctuation value in the shutdown process of the hydrogenation station; the first mass flowmeter is arranged on the first pipeline body and is positioned between the first valve and the second valve;
the second mass flow meter is arranged on the pipeline assembly and used for acquiring a second mass flow value of hydrogen in the hydrogenation process of the hydrogenation station and acquiring a second hydrogen fluctuation value in the shutdown process of the hydrogenation station; the second mass flow meter is arranged on the third pipeline body and is positioned between the seventh valve and the eighth valve;
the controller is connected with the first mass flow meter, the second mass flow meter and the valve assembly and is provided with a data analysis module; the data analysis module comprises
The mass flow difference calculating unit is used for calculating the mass flow difference of the hydrogen according to the first mass flow value and the second mass flow value in the hydrogenation process of the hydrogenation station;
the first hydrogen abnormal fluctuation detection unit is used for determining whether the first mass flowmeter has fluctuation abnormity or not through the first hydrogen fluctuation value in the shutdown process of the hydrogenation station;
the second hydrogen abnormal fluctuation detection unit is used for determining whether the second mass flowmeter has fluctuation abnormity or not according to the second hydrogen fluctuation value in the shutdown process of the hydrogenation station;
the alarm device is connected with the controller and alarms when the mass flow difference value reaches a first preset value;
the display, with the controller is connected, is equipped with and is used for showing the pipeline subassembly with the display screen of valve subassembly, and carry out the colour differentiation mark to the pipeline body of hydrogen leakage.
2. The hydrogen leakage monitoring system for the hydrogen refueling station according to claim 1, wherein: the monitoring system also comprises a timing triggering unit which is connected with the controller and triggers the first hydrogen abnormal fluctuation detection unit and/or the second hydrogen abnormal fluctuation detection unit to start when any valve of the valve assembly is closed and the waiting time reaches a second preset value after the corresponding valve is closed.
3. The hydrogen leakage monitoring system for the hydrogen refueling station according to claim 1, wherein: the monitoring system further comprises a hydrogen concentration detector, which is arranged near the fourth pipeline body and the fifth pipeline body, is connected with the controller, and is used for detecting the hydrogen concentration in the air and giving an alarm when the hydrogen concentration detected by the hydrogen concentration detector exceeds a third preset value.
4. The hydrogen leakage monitoring system for the hydrogen refueling station according to claim 1, wherein: the fourth pipeline body is provided with a plurality of third valves; the fifth pipeline body is provided with a plurality of sixth valves; the fourth pipeline body reaches the fifth pipeline body all includes many pipeline sections, two adjacent pipeline sections's junction is equipped with hydrogen sensitive sticky tape.
5. A monitoring method for hydrogen leakage of a hydrogen refueling station, which adopts the monitoring system of any one of claims 1 to 4, and is characterized in that: comprises the following steps
L11, in the hydrogenation process of the hydrogenation station, acquiring a first mass flow value through a first mass flow meter, and acquiring a second mass flow value through a second mass flow meter;
l12, calculating a mass flow difference value between the first mass flow value and the second mass flow value through a mass flow difference calculation unit, and alarming through an alarm device when the mass flow difference value reaches a first preset value; otherwise, return to L11;
an L13 worker manually enters a hydrogen leakage positioning program according to the alarm information;
wherein the hydrogen leakage localization procedure specifically comprises the following steps
L21 closes the gas unloading module, the pressurization module and the filling module to stop the hydrogenation station;
l22 closes the first valve and the eighth valve, the first hydrogen abnormal fluctuation detection unit determines whether the first mass flow meter has fluctuation abnormity through the first hydrogen fluctuation value, meanwhile, the second hydrogen abnormal fluctuation detection unit determines whether the second mass flow meter has fluctuation abnormity through the second hydrogen fluctuation value, and when the first mass flow meter and the second mass flow meter have no fluctuation abnormity, the hydrogen leakage positioning program exits; otherwise, go to L31;
l31, closing a fourth valve and a fifth valve on the second pipeline body, determining whether the first mass flowmeter has fluctuation abnormity through the first hydrogen fluctuation value by the first hydrogen abnormal fluctuation detection unit, determining whether the second mass flowmeter has fluctuation abnormity through the second hydrogen fluctuation value by the second hydrogen abnormal fluctuation detection unit, and entering L32 when the first mass flowmeter has fluctuation abnormity; when the second mass flowmeter has fluctuation abnormity, entering L33; when the first mass flow meter and the second mass flow meter have no fluctuation abnormity and indicate that the hydrogen leakage position is on the pipeline body between the fourth valve and the fifth valve, carrying out color distinguishing and labeling on the corresponding pipeline body through the display, and exiting the hydrogen leakage positioning program;
l32 closes the valve adjacent to the valve closed last time, the first hydrogen abnormal fluctuation detection unit determines whether the first mass flowmeter has fluctuation abnormality or not through the first hydrogen fluctuation value, when the first mass flowmeter has no fluctuation abnormality, the first mass flowmeter indicates that the hydrogen leakage position is on the pipeline body between the valve closed last time and the valve closed last time, the corresponding pipeline body is subjected to color distinguishing marking through the display, and the hydrogen leakage positioning program exits; when the first mass flow meter has abnormal fluctuation and the secondary closed valve is adjacent to the first valve, indicating that the hydrogen leakage position is on the pipeline body between the secondary closed valve and the first valve, carrying out color distinguishing and marking on the corresponding pipeline body through a display, and exiting the hydrogen leakage positioning program; otherwise, L32 is repeated;
l33 closes the valve adjacent to the valve closed last time, the second hydrogen abnormal fluctuation detection unit determines whether the second mass flowmeter has fluctuation abnormality through the second hydrogen fluctuation value, when the second mass flowmeter has no fluctuation abnormality, the hydrogen leakage position is indicated on the pipeline body between the valve closed last time and the valve closed last time, the corresponding pipeline body is subjected to color distinguishing marking through the display, and the hydrogen leakage positioning program exits; when the second mass flow meter has abnormal fluctuation and the secondary closed valve is adjacent to the eighth valve, the hydrogen leakage position is shown on the pipeline body between the secondary closed valve and the eighth valve, the corresponding pipeline body is subjected to color distinguishing and marking through the display, and the hydrogen leakage positioning program is quitted; otherwise, L33 is repeated.
6. The method for monitoring hydrogen leakage of a hydrogen refueling station according to claim 5, wherein: the monitoring method further comprises the step that when any one valve of the valve components is closed and the waiting time reaches a second preset value after the corresponding valve is closed, the timing triggering unit triggers the first hydrogen abnormal fluctuation detection unit and/or the second hydrogen abnormal fluctuation detection unit to start.
7. The method for monitoring hydrogen leakage of a hydrogen refueling station according to claim 5, wherein: the monitoring method further comprises the steps of detecting the hydrogen concentration in the air near the fourth pipeline body and the fifth pipeline body through a hydrogen concentration detector, and alarming when the hydrogen concentration detected by the hydrogen concentration detector exceeds a third preset value;
in the L13, when the alarm device and the hydrogen concentration detector alarm at the same time, a worker immediately and manually enters a hydrogen leakage positioning program according to the alarm information; when the alarm device gives an alarm but the hydrogen concentration detector does not give an alarm, the worker waits for the completion of the secondary hydrogenation operation according to the alarm information and then manually enters a hydrogen leakage positioning program.
8. The method for monitoring hydrogen leakage of a hydrogen refueling station according to claim 5, wherein: the monitoring method further comprises the step of arranging a plurality of third valves on the fourth pipeline body according to the actual length of the fourth pipeline body; and a plurality of sixth valves are arranged on the fifth pipeline body according to the actual length of the fifth pipeline body.
9. The method for monitoring hydrogen leakage of a hydrogen refueling station according to claim 5, wherein: the monitoring method further comprises the step of arranging a hydrogen sensitive adhesive tape on the fourth pipeline body or the fifth pipeline body, and when the hydrogen leakage position is on the fourth pipeline body or the fifth pipeline body, finding the specific hydrogen leakage position by the aid of the hydrogen sensitive adhesive tape.
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