CN113007592A - Online detection method for gas storage cylinder - Google Patents

Online detection method for gas storage cylinder Download PDF

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Publication number
CN113007592A
CN113007592A CN201911315712.1A CN201911315712A CN113007592A CN 113007592 A CN113007592 A CN 113007592A CN 201911315712 A CN201911315712 A CN 201911315712A CN 113007592 A CN113007592 A CN 113007592A
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China
Prior art keywords
gas cylinder
detection
gas
fiber layer
valve
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CN201911315712.1A
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Chinese (zh)
Inventor
郭淑芬
岳也
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Weishi Energy Technology Co Ltd
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Weishi Energy Technology Co Ltd
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Priority to CN201911315712.1A priority Critical patent/CN113007592A/en
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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
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/16—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of plastics materials
    • 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
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • 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
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • 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
    • F17C2250/0439—Temperature
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/035—Dealing with losses of fluid
    • F17C2260/038—Detecting leaked fluid
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
    • F17C2270/0178—Cars
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0184—Fuel cells
    • 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
    • Y02E60/32—Hydrogen storage

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses an online detection method for a gas storage cylinder. The gas cylinder comprises an inner container and a fiber layer wound on the periphery of the inner container, a valve is arranged at the mouth of the gas cylinder, and the gas cylinder online detection method comprises the following steps: nondestructive testing of the fiber layer, namely testing whether the fiber layer is damaged; valve nondestructive detection, which is to detect whether the valve is leaked; and the nondestructive detection of the inner container is carried out, and the nondestructive detection of the inner container is carried out after gas is filled in the gas storage cylinder. According to the gas cylinder online detection method, the gas cylinder can be detected and evaluated online without being disassembled, and the detection result is output in real time, so that the gas cylinder can be detected safely and efficiently, and the gas cylinder can be detected in a large-scale and standardized manner.

Description

Online detection method for gas storage cylinder
Technical Field
The invention relates to the technical field of automobile parts, in particular to an online detection method for a gas storage cylinder.
Background
The energy source hydrogen of the hydrogen fuel cell automobile needs to be stored in the vehicle-mounted gas storage cylinder, and in order to realize higher volume hydrogen storage density and mass hydrogen storage density, the plastic liner fiber full-winding composite gas storage cylinder is one of the main development directions of the future gas storage cylinder.
Compound gas bomb of inner bag fibre full winding belongs to high-pressure movable type pressure vessel, must carry out periodic detection and evaluation, the detection method of the compound gas bomb of metal inner bag fibre full winding commonly used at present detects for periodic disassembly, the gas bomb is generally placed in vehicle chassis or roof or railway carriage or compartment the place ahead, the gas bomb is dismantled inconveniently, and certain danger has during the dismantlement, the gas bomb is still probably damaged in the dismantlement process, how high-efficient, detect the compound gas bomb of inner bag fibre full winding and be a problem of waiting to solve urgently safely.
Disclosure of Invention
In view of the above, the present invention is directed to provide an online detection method for a gas cylinder, which is used to detect and evaluate the gas cylinder without disassembling the gas cylinder, and output a detection result in real time.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an online detection method for a gas cylinder comprises an inner container and a fiber layer wound on the periphery of the inner container, wherein a valve is arranged at the mouth of the gas cylinder, and comprises the following steps: nondestructive testing of the fiber layer, namely testing whether the fiber layer is damaged; valve nondestructive detection, which is to detect whether the valve is leaked; and the nondestructive detection of the inner container is carried out, and the nondestructive detection of the inner container is carried out after gas is filled in the gas storage cylinder.
According to some embodiments of the invention, in the nondestructive testing of the fiber layer, an ultrasonic phased array technology is used for testing whether the fiber layer is damaged or not.
According to some embodiments of the invention, the ultrasound phased array technique uses a phased array detector, a computer with detection software for acquiring, processing, and displaying data, the phased array detector being electrically connected to the computer and having a phased array probe adapted to contact the fiber layer to obtain an ultrasound phased array image of the fiber layer on the computer.
Furthermore, the phased array probe is a flexible probe with the radian identical to that of the outer surface of the fiber layer.
According to some embodiments of the invention, in the nondestructive testing of the fiber layer, whether the fiber layer is damaged or not is detected by using an ultrasonic C scanning method or an infrared thermal wave detection method or a microwave detection method.
According to some embodiments of the invention, the non-destructive testing of the valve is performed after the gas cylinder is filled with gas, wherein the non-destructive testing of the valve is performed by detecting a leak at the valve using an acoustic emission sensor, and the structural integrity of the valve is assessed by detecting a leak at the valve using the acoustic emission sensor.
According to some embodiments of the invention, the gas cylinder online detection method further comprises: and air leakage detection, namely detecting whether the gas storage cylinder leaks air or not, wherein the air leakage detection is carried out after gas is filled in the gas storage cylinder.
Further, in the gas leakage detection, a gas analyzer corresponding to the gas storage body is adopted to perform gas leakage detection on the bottle body and the periphery of the gas storage bottle and at the interface of the valve.
According to some embodiments of the present invention, in the above method for detecting a gas cylinder online, the inner container is a plastic inner container.
Further, in the nondestructive detection of the inner container, an infrared thermal imager is adopted for detection.
Further, when gas is filled into the gas storage bottle, the pressure in the gas storage bottle is filled to the rated working pressure, the temperature of the liner is increased at the stress concentration part, and the temperature is detected by the infrared thermal imager in the nondestructive testing of the liner, so that the fatigue damage degree of the liner is reflected.
According to some embodiments of the invention, the inner container is a metal inner container.
Further, in the nondestructive detection of the inner container, an acoustic emission sensor is used for detecting whether the inner container leaks, and the structural integrity of the inner container is evaluated by detecting the leakage condition of the inner container through the acoustic emission sensor.
Compared with the prior art, the online detection method for the gas bomb has the following advantages:
according to the gas cylinder online detection method, the gas cylinder can be detected and evaluated online without being disassembled, and the detection result is output in real time, so that the gas cylinder can be detected safely and efficiently, and the gas cylinder can be detected in a large-scale and standardized manner.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic illustration of a non-destructive testing of a fiber layer;
FIG. 2 is a schematic diagram of a test block;
FIG. 3 is a top view of a test block;
FIG. 4 is a schematic view of a non-destructive inspection of a valve.
Description of reference numerals:
the gas bomb comprises a gas bomb body 1, a coupling agent 2, a phased array probe 3, a phased array detector 4, a computer 5, a valve 6, an acoustic coupling agent 8, a preamplifier 9, an acoustic emission collector 10, a test block 11, a deep hole 12 and an acoustic emission sensor 13.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The method for detecting a gas cylinder on line according to the present invention will be described in detail with reference to fig. 1 to 4 in conjunction with the following examples.
Referring to fig. 1-4, the gas storage cylinder 1 comprises an inner container and a fiber layer wound on the periphery of the inner container, a valve is arranged at the mouth of the gas storage cylinder 1, a stored gas body in the inner container can be sealed by screwing the valve, and the gas output of the stored gas body can be adjusted by controlling the opening degree of the valve.
The online detection method of the gas cylinder comprises the following steps: nondestructive testing of the fiber layer, nondestructive testing of the valve and nondestructive testing of the liner.
The fiber layer nondestructive testing is used for detecting whether the fiber layer is damaged or not, the valve nondestructive testing is used for detecting whether the valve 6 is leaked or not, the liner nondestructive testing is used for detecting the liner, and the liner nondestructive testing is carried out after the gas is filled in the gas storage bottle 1.
According to the gas cylinder online detection method, the gas cylinder 1 can be detected and evaluated online without disassembling the gas cylinder 1, and the detection result is output in real time, so that the gas cylinder 1 can be detected safely and efficiently, and the gas cylinder 1 can be detected in a large-scale and standardized manner.
In some embodiments of the invention, in the nondestructive testing of the fiber layer, the ultrasonic phased array technology is used for testing whether the fiber layer is damaged or not.
Specifically, the principle of the ultrasonic phased array technology is that discontinuity inside an object is found by utilizing changes of some physical properties of ultrasonic waves when the ultrasonic waves are transmitted in the object, a fiber layer of the gas cylinder 1 can be made of carbon fiber composite materials, the carbon fiber composite materials are prone to generating layering defects, inclusion, debonding and other damage conditions in the production and service processes, the defects and the damage can cause discontinuity inside the fiber layer of the gas cylinder 1, and the ultrasonic phased array technology can have good imaging effects on the defects, the damage and other conditions of the fiber layer, so that detection and identification are facilitated.
Further, referring to fig. 1, the ultrasonic phased array technique uses a phased array detector 4 and a computer 5, the computer 5 is internally provided with detection software for acquiring, processing and displaying data, the phased array detector 4 is electrically connected with the computer 5, and the phased array detector 4 is provided with a phased array probe 3 adapted to be in contact with a fiber layer so as to obtain an ultrasonic phased array image of the fiber layer on the computer 5.
Specifically, phased array probe 3 passes through couplant 2 to be fixed on the fibrous layer surface, and phased array probe 3 will detect data and transmit to phased array detector 4 through the cable, and phased array detector 4 will detect data and transmit to computer 5 through the USB interface with the digital signal form, is equipped with detection software in the computer 5 for data acquisition, processing and display. Phased array probe 3 is less, need not move the probe and just can cover certain detection range, in the vehicle chassis structure of complicacy, has obvious advantage in the aspect of the defect detection to on-vehicle gas bomb 1, compares in traditional macro detection and hydrostatic test, and the testing result is also more accurate.
The method for carrying out nondestructive testing on the fiber layer by adopting the ultrasonic phased array technology comprises the following steps:
1. cleaning the surface of the fiber layer to improve the definition and accuracy of the ultrasonic phased array image;
2. the fiber layer and the surface of the test block 11 are coated with a couplant 2, the couplant 2 is water, grease or vaseline which cannot damage the surface of the fiber layer, the couplant 2 can be coupled with the phased array probe 3, air between the phased array probe 3 and the fiber layer is eliminated, and the definition of an ultrasonic phased array image is improved;
3. fixing a phased array probe 3 on the surface of the fiber layer, scanning according to the axial direction of the gas storage bottle 1, wherein the detection grade adopts C grade, and collecting scanned sector detection data;
4. and determining the positions and sizes of the defects and the damages of the fiber layers through the ultrasonic phased array images.
Preferably, referring to fig. 2 and 3, a stepped test block 11 made of the same material as the fiber layer can be manufactured according to the thickness of the fiber layer, cylindrical deep holes 12 with different depths H and different diameters phi are machined in each stepped layer, so that defects and damages are easily generated in the production and service processes of the fiber layer, and an ultrasonic phased array image of the fiber layer obtained by the phased array probe 3 is compared with an image of the comparison test block 11, thereby being beneficial to accurately determining the sizes of the defects and the damages of the fiber layer.
Preferably, phased array probe 3 is the same flexible probe with the fibrous layer external surface radian, and flexible probe can be according to the probe of the shape of gas bomb 1 self-regulation shape to be favorable to phased array probe 3 to laminate with the fibrous layer external surface completely, and then be favorable to promoting the definition of supersound phased array image.
Alternatively, when the fibre layer has a circular outer surface, the phased array probe 3 may be a semi-circular probe having the same profile as the fibre layer.
In other embodiments of the present invention, in the nondestructive testing of the fiber layer, whether the fiber layer is damaged or not is detected by using an ultrasonic C scanning method, an infrared thermal wave detection method or a microwave detection method.
Specifically, the ultrasonic C-scan method detects void defects inside a fiber layer by using the attenuation and propagation speed of ultrasonic waves, is intuitive to display, is easy and convenient to operate, and can be used for quantitative analysis.
The infrared thermal wave detection method is characterized in that the fiber layer is actively heated through infrared thermal waves, the temperature of the surface of the fiber layer is different by utilizing the difference of thermal properties inside the fiber layer and the discontinuity of heat conduction, and then a temperature gradient is formed in a local area of the surface of the fiber layer, and the defects and damage conditions of the fiber layer can be judged through analyzing the temperature gradient.
The microwave detection method is to carry out nondestructive detection on the fiber layer by utilizing the characteristics of strong penetrating power and small attenuation of microwaves in the fiber layer and better sensitivity to the defects of air holes, sparse holes, resin cracking, delamination, debonding and the like which are difficult to avoid in the fiber layer.
Referring to fig. 4, the nondestructive valve inspection is performed after the gas cylinder 1 is filled with gas, in the nondestructive valve inspection, the acoustic emission sensor 13 is used to detect whether the valve 6 leaks, and the structural integrity of the valve 6 is evaluated by detecting the leakage of the valve 6 through the acoustic emission sensor 13.
Specifically, the acoustic emission sensor 13 is connected to the preamplifier 9, the acoustic emission collector 10, and the like. When the sealing performance of the valve 6 is poor and gas leaks, the gas in the valve body is sprayed out from a gap of a sealing surface to form turbulent flow, the turbulent flow impacts the sealing surface of the valve 6 to cause vibration of the valve 6, the mechanical vibration of the valve 6 is converted into an electric signal by the acoustic emission sensor 13 due to the piezoelectric effect, the electric signal is amplified by the preamplifier 9 and then processed and recorded by the acoustic emission collector 10, and the leakage condition of the valve 6 can be mastered by analyzing and judging the recorded acoustic emission signal, so that the material performance or the structural integrity of the valve 6 can be evaluated.
The nondestructive detection of the valve comprises the following steps:
1. calibrating the acoustic emission sensor 13;
2. cleaning the bottle mouth of the gas bomb 1 and the surface of the valve 6, and fixing the acoustic emission sensor 13 on the bottle mouth and the surface of the valve 6 by using an acoustic coupling agent 8, a clamp or an adhesive;
3. filling gas into the gas storage cylinder 1, and collecting acoustic emission data;
4. and carrying out data analysis according to the data of the acoustic emission.
The gas cylinder online detection method also comprises the following steps: gas leakage detection, whether leak gas and detect gas storage cylinder 1, gas leakage detection goes on after filling gas in gas storage cylinder 1, and further, in gas leakage detection, adopt the gas analysis appearance that corresponds with the gas storage cylinder to carry out gas leakage detection to the bottle of gas storage cylinder 1 and around, the kneck of valve 6 to confirm whether gas storage cylinder 1 leaks gas and leak site position.
Specifically, the gas storage bottle 1 can be filled with hydrogen, the gas storage bottle 1 is filled to working pressure and then pressure maintaining is carried out, a hydrogen analyzer is used for detecting the content of the hydrogen at the bottle body of the gas storage bottle 1, the periphery of the bottle body and the interface of the valve 6, the range of the hydrogen analyzer can reach 0-2000ppm, the resolution ratio reaches 20ppm, if a leakage position exists, the hydrogen analyzer can be used for accurately detecting a leakage point, and corresponding countermeasures are taken after leakage is found, so that the safety of a hydrogen fuel cell automobile gas supply system is ensured.
In some embodiments of the invention, the liner is a plastic liner.
Further, in the nondestructive testing of the inner container, an infrared thermal imager is used for testing, further, when gas is filled into the gas storage bottle 1, the pressure in the gas storage bottle 1 is filled to the rated working pressure, the temperature of the plastic inner container is increased at the stress concentration part, and in the nondestructive testing of the inner container, the temperature is increased through the infrared thermal imager, so that the fatigue damage degree of the plastic inner container is reflected.
Specifically, the nondestructive detection step of the liner comprises the steps of firstly filling the gas storage bottle 1 with rated working pressure of a device from a low-pressure state, wherein the stress concentration part of the plastic liner can generate irreversible temperature increase larger than 1 ℃ after a certain fatigue period in the process of bearing gas filling, an infrared thermal imager is utilized to detect the temperature increase of the parts, wherein the part with the highest temperature value is called as a 'hot spot' in an infrared image, the area of the hot spot is the part with the most concentrated stress of the plastic liner and is also the part of the plastic liner which finally generates fatigue fracture, and the temperature increase is detected by the infrared thermal imager to reflect the fatigue damage degree of the plastic liner.
In some embodiments of the invention, the liner is a plastic liner, the gas storage cylinder 1 is a vehicle-mounted high-pressure hydrogen storage cylinder with a pressure grade of 70MPa, and belongs to a high-pressure movable pressure container, and the disassembly-free online detection method comprises the following steps:
preparation for detection → appearance detection and evaluation → fiber layer nondestructive detection → hydrogen filling of the hydrogen storage bottle → valve nondestructive detection → hydrogen storage bottle filling to rated pressure → liner nondestructive detection → hydrogen storage bottle pressure maintaining → gas leakage detection.
The detection preparation and the appearance detection and evaluation processes in the online detection method of the gas cylinder 1 with the plastic inner container are similar to the periodic disassembly detection mode of the composite gas cylinder with the metal inner container, the related marks of the gas cylinder are mainly detected, the damage level of the gas cylinder 1 in appearance is evaluated, and the gas cylinder 1 is not required to be disassembled only through the detection preparation and the appearance detection and evaluation.
In other embodiments of the present invention, the inner container is a metal inner container.
Further, in the nondestructive detection of the liner, the acoustic emission sensor 13 is used for detecting whether the metal liner leaks, and the structural integrity of the metal liner is evaluated by detecting the leakage condition of the metal liner through the acoustic emission sensor 13.
In some embodiments of the invention, the inner container is a metal inner container, the gas storage cylinder 1 is a vehicle-mounted high-pressure hydrogen storage cylinder with the pressure grade of 35MPa, which belongs to a high-pressure movable pressure container, and the disassembly-free online detection method comprises the following steps:
preparation for detection → appearance detection and evaluation → fiber layer nondestructive testing → hydrogen filling of the hydrogen storage bottle → valve nondestructive testing → liner nondestructive testing → pressure maintaining of the hydrogen storage bottle → gas leakage detection.
The detection preparation and the appearance detection and evaluation processes in the online detection method of the gas cylinder 1 with the metal liner mainly detect the relevant marks of the gas cylinder and evaluate the damage level of the gas cylinder 1 on the appearance. Of course, in order to improve the safety of the cylinder 1, two to three disassembly tests, such as a third cylinder test and a fifth cylinder test, may be performed within a specified life cycle of the cylinder 1.
The gas cylinder online detection method has the following advantages:
1. the online detection can adapt to a complex vehicle body structure, is more efficient and safer compared with the disassembly detection, and simultaneously avoids the damage caused by frequent disassembly of the gas cylinder with the liner fiber fully wound;
2. at present, the fiber layer is detected only by visual inspection, only the surface damage of the fiber layer can be observed, the nondestructive detection of the fiber layer can be complete, and the surface damage, the internal defects and the like of the fiber layer can be accurately detected;
3. the infrared thermal imager can observe the temperature change of the plastic liner in the whole filling process, and can visually reflect the fatigue damage degree of the plastic liner;
4. the online detection method of the gas cylinder is simple and effective, and is beneficial to large-scale detection of the gas cylinder with the metal liner and the future plastic liner which are fully wound by fibers;
5. compared with the detection process of only detecting the bottle body and the valve 6 when the gas storage bottle 1 is detached at present, the gas storage bottle 1 provided by the invention has the advantages that the air tightness of the whole gas supply system is considered in online detection, and the safety of the hydrogen fuel cell automobile gas supply system is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (13)

1. The online detection method for the gas cylinder is characterized in that the gas cylinder (1) comprises an inner container and a fiber layer wound on the periphery of the inner container, a valve (6) is arranged at the opening of the gas cylinder (1), and the online detection method for the gas cylinder comprises the following steps:
nondestructive testing of the fiber layer, namely testing whether the fiber layer is damaged;
valve nondestructive testing, namely testing whether the valve (6) is leaked;
and the nondestructive detection of the inner container is carried out after the gas is filled in the gas storage bottle (1).
2. The method for on-line testing of a gas cylinder according to claim 1, wherein in the nondestructive testing of the fiber layer, an ultrasonic phased array technique is used to test whether the fiber layer is damaged or not.
3. The on-line gas cylinder detection method according to claim 2, characterized in that the ultrasonic phased array technology uses a phased array detector (4) and a computer (5), the computer (5) is internally provided with detection software for collecting, processing and displaying data, the phased array detector (4) is electrically connected with the computer (5), and the phased array detector (4) is provided with a phased array probe (3) which is suitable for contacting with the fiber layer so as to obtain the ultrasonic phased array image of the fiber layer on the computer (5).
4. The on-line gas cylinder detection method according to claim 3, characterized in that the phased array probe (3) is a flexible probe with the same radian as the outer surface of the fiber layer.
5. The method for detecting the gas cylinder on line according to claim 1, wherein in the nondestructive detection of the fiber layer, whether the fiber layer is damaged or not is detected by an ultrasonic C scanning method, an infrared thermal wave detection method or a microwave detection method.
6. The method for the on-line detection of the gas cylinder according to claim 1, characterized in that the valve non-destructive testing is performed after the gas cylinder (1) is filled with gas, in the valve non-destructive testing, an acoustic emission sensor (13) is used for detecting whether the valve (6) is leaked, and the structural integrity of the valve (6) is evaluated by detecting the leakage of the valve (6) through the acoustic emission sensor (13).
7. The online gas cylinder detection method according to claim 1, further comprising: and air leakage detection, namely detecting whether the air storage bottle (1) leaks air or not, wherein the air leakage detection is carried out after the air storage bottle (1) is filled with air.
8. The online gas cylinder detection method according to claim 7, wherein in the gas leakage detection, a gas analyzer corresponding to the gas cylinder is used to perform gas leakage detection on the body and the periphery of the gas cylinder (1) and at the interface of the valve (6).
9. The online detection method for the gas cylinder as claimed in any one of claims 1 to 8, wherein the liner is a plastic liner.
10. The method for on-line detection of a gas cylinder according to claim 9, wherein an infrared thermal imager is used for detection in the nondestructive detection of the inner container.
11. The online detection method of the gas cylinder according to claim 10, wherein when gas is filled into the gas cylinder (1), the pressure in the gas cylinder (1) is filled to a rated working pressure, the temperature of the liner is increased at a stress concentration part, and the temperature is detected by the infrared thermal imaging instrument during nondestructive detection of the liner to reflect the fatigue damage degree of the liner.
12. The online detection method of the gas cylinder as claimed in any one of claims 1 to 8, wherein the inner container is a metal inner container.
13. The online gas cylinder detection method according to claim 12, wherein in the nondestructive internal container detection, an acoustic emission sensor (13) is used to detect whether the internal container leaks, and the structural integrity of the internal container is evaluated by detecting the leakage condition of the internal container through the acoustic emission sensor (13).
CN201911315712.1A 2019-12-19 2019-12-19 Online detection method for gas storage cylinder Pending CN113007592A (en)

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