CN116147716A - System and method for continuously detecting hydrogen leakage of hydrogen fuel automobile based on constant volume dilution - Google Patents
System and method for continuously detecting hydrogen leakage of hydrogen fuel automobile based on constant volume dilution Download PDFInfo
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- CN116147716A CN116147716A CN202310209163.XA CN202310209163A CN116147716A CN 116147716 A CN116147716 A CN 116147716A CN 202310209163 A CN202310209163 A CN 202310209163A CN 116147716 A CN116147716 A CN 116147716A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 239000001257 hydrogen Substances 0.000 title claims abstract description 123
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 123
- 238000010790 dilution Methods 0.000 title claims abstract description 48
- 239000012895 dilution Substances 0.000 title claims abstract description 48
- 239000000446 fuel Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 15
- 238000004321 preservation Methods 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 238000004088 simulation Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 29
- 238000010926 purge Methods 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 239000013618 particulate matter Substances 0.000 claims description 4
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000005286 illumination Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000004445 quantitative analysis Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000003113 dilution method Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
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Abstract
The invention belongs to the technical field of hydrogen leakage detection of hydrogen fuel automobiles, and discloses a system for continuously detecting hydrogen leakage of hydrogen fuel automobiles based on constant volume dilution, which comprises a heat preservation cabin body used for constructing a closed space, wherein the heat preservation cabin body is connected with an air inlet fan, a sunlight simulation system, an adjusting air bag, a constant volume dilution channel, an inflatable sealing ring and a gate; the constant volume dilution channel is connected with an exhaust valve, a hydrogen concentration analyzer, a venturi flowmeter and an exhaust fan; the invention sucks the mixture in the closed space into the constant volume dilution channel, detects the current leaked hydrogen volume in the constant volume dilution channel, and multiplies the volume and the density into the leaked hydrogen mass; the detected mass of leaked hydrogen is then integrated to obtain the mass of all leaked hydrogen. The invention continuously detects the quality of hydrogen leakage of the hydrogen fuel automobile based on the constant volume dilution method, has high accuracy in detection, has no intentional requirement on the position where the automobile is placed, and has good repeatability in detection.
Description
Technical Field
The invention relates to the technical field of hydrogen leakage detection of hydrogen fuel automobiles, in particular to a system and a method for continuously detecting hydrogen leakage of hydrogen fuel automobiles based on constant volume dilution.
Background
With the development of science and technology, environmental problems become one of the important concerns of various industries, and in the automotive industry, new energy automobiles are gradually widely used in daily life, such as hydrogen fuel automobiles. The hydrogen fuel automobile stores hydrogen gas in a hydrogen storage device at a pressure of 35MPa or 70 MPa. Because hydrogen has small molecules, small density, strong diffusion capability and strong permeation and hydrogen quenching effects, leakage is very easy to occur; hydrogen has the characteristics of inflammability, explosiveness and the like. Therefore, under the combined action of high-pressure storage, hydrogen gas leaks into a serious potential safety hazard of the hydrogen fuel automobile. In order to avoid the hidden trouble, in the current safety technical standard of the hydrogen fuel automobile, the hydrogen leakage test requirement in the closed space based on the hydrogen concentration is proposed; but this concentration-based detection has two core drawbacks:
1) After leakage occurs, a hydrogen concentration gradient exists in the vertical direction, which may cause underestimation of the leakage concentration, that is, poor detection accuracy;
2) The concentration readings of the hydrogen sensor are affected by the size of the enclosed space, the size of the vehicle, and the sensor mounting location (the position of the vehicle at the time of detection), making the method less deterministic and repeatable.
Disclosure of Invention
The invention aims to provide a system and a method for continuously detecting hydrogen leakage of a hydrogen fuel automobile based on constant volume dilution, wherein under the drive of an exhaust fan, a mixture of leaked hydrogen and air in a closed space passes through a constant volume dilution channel, the flow of the mixture is controlled to be a designed constant value by a critical venturi tube in a venturi flowmeter, the concentration of the hydrogen in the dilution channel is continuously detected, then the volume of the leaked hydrogen is calculated through integration, and the hydrogen density corrected to a test condition is multiplied to obtain the hydrogen leakage quality. The method solves the problems of poor detection accuracy, uncertainty and poor repeatability of the detection method based on concentration of the hydrogen leakage amount of the hydrogen fuel automobile in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
the system for continuously detecting hydrogen leakage of the hydrogen fuel automobile based on constant volume dilution comprises a heat preservation cabin body for constructing a closed space, wherein the heat preservation cabin body is connected with an air inlet fan, a sunlight simulation system and an adjusting air bag; the air inlet fan is provided with a filtering device, and an air inlet valve for controlling air to enter the closed space is connected between the air inlet fan and the heat preservation cabin body; the sunlight simulation system is arranged at the top of the closed space and is used for simulating the illumination condition when the vehicle is parked outdoors; the adjusting air bag is used for adjusting the volume of the adjusting air bag in the closed space so as to keep the air pressure in the closed space stable; the heat preservation cabin body is also communicated with a constant volume dilution channel, one end of the constant volume dilution channel is arranged on the inner side of the closed space, and the other end of the constant volume dilution channel is connected with an exhaust fan; the exhaust fan is used for exhausting the mixture of leaked hydrogen and air in the closed space; the constant volume dilution channel is also connected with an exhaust valve, a hydrogen concentration analyzer and a venturi flowmeter, and the exhaust valve is used for controlling gas to be discharged out of the closed space; the venturi flowmeter is arranged between the exhaust valve and the exhaust fan, corrects the gas flow passing through the inner side of the venturi flowmeter according to the detected atmospheric pressure and temperature, and outputs the corrected real-time gas flow at the frequency of 1 Hz; the hydrogen concentration analyzer is arranged between the exhaust valve and the venturi flowmeter, and is used for detecting the hydrogen volume fraction in the constant volume dilution channel, and the heat preservation cabin body is also rotationally connected with a gate for opening or closing the closed space.
Further, the heat-insulating cabin body is also connected with an inflatable sealing ring for sealing the gap between the vehicle entering and exiting the gate; when a vehicle needs to go in and out, the interior of the inflatable sealing ring is not inflated, so that the gate is opened and closed conveniently; when a vehicle enters the closed space and internal purging is completed, the inflatable sealing ring is inflated to avoid gas leakage in the closed space.
Further, the heat-preserving cabin body comprises a temperature control and heat exchanger, and a heat exchange pipeline taking water as a working medium is arranged in the heat-preserving cabin body, so that the temperature in the body of the heat-preserving cabin body and the closed space is controlled within an allowable error range of the test temperature; the inside of the heat preservation cabin body is an aluminum plate or a stainless steel plate with polished surfaces so as to reduce the adsorption of hydrogen on the inner surface of the closed space.
Further, the filter device is a HEPA efficient particulate matter filter element to remove particulates in the purge gas and prevent particulate matter from accumulating at the intake valve.
Further, the venturi flowmeter is a critical venturi tube or an array formed by circumferentially arranging a plurality of critical venturi tubes; under the suction effect of the exhaust fan, the gas in the closed space flows through the throat of the critical venturi tube at a local sound speed, and the flow rates of the gas in the critical venturi tube and the constant-volume dilution channel are basically constant due to the fact that the interception area of the throat is determined, the gas flow rate slightly fluctuates with the atmospheric pressure and the temperature, and the influence of the fluctuation is corrected and compensated when the flow meter result is read after the test is finished.
Further, the adjusting air bag is made of Teflon materials, and an air charging pipe of the adjusting air bag is connected with an air pump; when the air pressure in the closed space rises due to the rising of the temperature, the air pump pumps air to the outer side of the adjusting air bag, so that the volume is reduced; when the air pressure in the closed space is reduced due to the temperature decrease, the air pump inflates the inner side of the adjusting air bag, and the volume is increased so as to keep the air pressure in the closed space stable.
The method for detecting hydrogen leakage by using the system for continuously detecting hydrogen leakage of hydrogen fuel automobile based on constant volume dilution comprises the following steps:
s1, opening a gate, placing a vehicle in a closed space constructed by a thermal insulation cabin, and then closing the gate;
s2, opening an air inlet valve, opening an air inlet fan, and purging air in the closed space; after purging, closing the air inlet fan and the air inlet valve, and inflating the inflatable sealing ring to fill the gap between the gate and the heat-preserving cabin body after the inflatable sealing ring is inflated so as to avoid leakage of air in the closed space from the gap;
s3, starting a heat exchanger and a sunlight simulation system in the heat preservation cabin body, and adjusting the temperature in the closed space to be within an allowable error range of the test temperature; starting an air pump to adjust the volume of the adjusting air bag, and adjusting the pressure in the closed space to the standard atmospheric pressure;
s4, standing the vehicle in the closed space for more than 12 hours, and starting a leakage test;
s5, after the leakage test time expires, opening an exhaust valve, and starting an exhaust fan; then opening the air inlet valve to exhaust the air in the closed space; reading and recording the readings of the Venturi flowmeter and the hydrogen concentration analyzer at the frequency of 1 s/time while starting the exhaust fan until the continuous 10s of the readings of the hydrogen concentration analyzer is 0, and stopping recording;
s6, calculating the leakage quantity of the hydrogen based on a hydrogen leakage quality quantitative method, wherein the specific calculation formula is as follows:
in the method, in the process of the invention,
is the leakage mass g of hydrogen in the closed space>
To correct the hydrogen density kg/m to the test temperature conditions 3 ，
For the flow rate m of the gas flowing through the venturi meter 3 /s，
Volume fraction of hydrogen in dilution passage detected by hydrogen concentration analyzer 10 -6 。
The technical proposal has the following principle and beneficial effects:
the invention sucks the mixture of leaked hydrogen and air in the closed space into the constant volume dilution channel by the exhaust fan at a basically constant flow, the product of the detected gas flow and the hydrogen volume fraction in the channel is the volume of the leaked hydrogen detected at the current moment, and the density of the hydrogen is a constant value as the gas temperature in the constant volume dilution channel is the same as and is constant with the gas temperature in the closed space, so that the product of the density of the hydrogen and the volume of the leaked hydrogen is the mass of the leaked hydrogen detected at the current moment; when the volume fraction of the hydrogen detected by the hydrogen concentration analyzer is more than 0 continuously for 10 seconds, the hydrogen is not remained in the closed space; at this time, the mass of the detected leaked hydrogen is integrated, so that the mass of all the leaked hydrogen in the closed space can be obtained; since the gas flow and the hydrogen volume fraction in the constant volume dilution tunnel are both detected at a frequency of 1Hz, the integral value can be approximately solved by superposition of all recorded leak hydrogen masses per second. The invention continuously detects the quality of hydrogen leakage of the hydrogen fuel automobile based on the constant volume dilution method, has high accuracy in detection, has no intentional requirement on the position where the automobile is placed, and has good repeatability in detection.
Drawings
FIG. 1 is a schematic diagram of a system for measuring hydrogen leakage in a hydrogen fuel automobile by placing the automobile in a system for continuously detecting hydrogen leakage based on constant volume dilution;
the names of the corresponding marks in the drawings are:
the device comprises an air inlet fan 1, an air inlet valve 2, a heat preservation cabin 3, an inflatable sealing ring 4, an air outlet fan 5, a hydrogen concentration analyzer 6, a gate 7, a sunlight simulation system 8, a venturi flowmeter 9, an air outlet valve 10, a constant volume dilution channel 11, an adjusting air bag 12 and a vehicle 13.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and embodiments:
as shown in fig. 1, the system for continuously detecting hydrogen leakage of a hydrogen fuel automobile based on constant volume dilution comprises a heat preservation cabin body 3 for constructing a closed space, wherein the heat preservation cabin body 3 comprises a temperature control and a heat exchanger, a heat exchange pipeline taking water as a working medium is arranged in the heat preservation cabin body 3, so that the temperature in the body of the heat preservation cabin body 3 and the closed space is controlled within an allowable error range of a test temperature, and an aluminum plate or a stainless steel plate with polished surfaces is arranged in the heat preservation cabin body 3 so as to reduce the adsorption of hydrogen on the inner surface of the closed space; the heat preservation cabin body 3 is connected with an air inlet fan 1, a sunlight simulation system 8 and an adjusting air bag 12; the air inlet fan 1 is arranged on the left side wall of the closed space, an air inlet valve 2 for controlling air to enter the closed space is connected between the air inlet fan 1 and the heat preservation cabin body 3, the air inlet fan 1 is provided with a filtering device, and the filtering device is a HEPA efficient particulate matter filtering filter core for removing particulate matters in the purge air and preventing the particulate matters from accumulating at the air inlet valve 2; the sunlight simulation system 8 and the adjusting air bag 12 are arranged at the top of the closed space, and the sunlight simulation system 8 is used for simulating the illumination condition when the vehicle 13 is parked outdoors; the adjusting air bag 12 is made of Teflon material, and an air charging pipe of the adjusting air bag is connected with an air pump; when the air pressure in the closed space rises due to the rising of the temperature, the air pump pumps air to the outer side of the regulating air bag 12, so that the volume is reduced; when the air pressure in the closed space is reduced due to the temperature decrease, the air pump inflates the inner side of the regulating air bag 12 to increase the volume so as to keep the air pressure in the closed space stable; the heat preservation cabin body 3 is also communicated with a constant volume dilution channel 11, the upper end of the constant volume dilution channel 11 is arranged on the inner side of the closed space, and the lower end of the constant volume dilution channel 11 is connected with an exhaust fan 5; the exhaust fan 5 is used for exhausting the mixture of the leaked hydrogen and air in the closed space; the constant volume dilution channel 11 is also connected with an exhaust valve 10, a hydrogen concentration analyzer 6 and a venturi flowmeter 9, and the exhaust valve 10 is used for controlling gas to be discharged out of the closed space; the venturi flowmeter 9 is arranged between the exhaust valve 10 and the exhaust fan 5, the venturi flowmeter 9 is an array formed by circumferentially arranging a plurality of critical venturi tubes, under the suction effect of the exhaust fan 5, gas in the closed space flows through the throat of the critical venturi tubes at a local sound speed, the shutoff area of the throat is determined, so that the gas flow in the critical venturi tubes and the constant volume dilution channel 11 is basically constant and only slightly fluctuates with the atmospheric pressure and the temperature, the venturi flowmeter 9 corrects the gas flow passing through the inner side of the venturi tubes according to the detected atmospheric pressure and the temperature, and the corrected real-time gas flow is output at a frequency of 1 Hz; the hydrogen concentration analyzer 6 is arranged between the exhaust valve 10 and the venturi flowmeter 9, and the hydrogen concentration analyzer 6 is used for detecting the hydrogen volume fraction in the constant-volume dilution channel 11; the heat preservation cabin body 3 is rotatably connected with a gate 7 for opening or closing the closed space; the thermal insulation cabin body 3 is also connected with an inflatable sealing ring 4 for sealing the gap of the vehicle 13 entering and exiting the gate 7; when the vehicle 13 needs to go in and out, the inside of the inflatable sealing ring 4 is not inflated, so that the gate 7 is opened and closed conveniently; when the vehicle 13 enters the enclosed space and the internal purging is completed, the inside of the inflatable sealing ring 4 is inflated to avoid gas leakage in the enclosed space.
The method for detecting hydrogen leakage by using the system for continuously detecting hydrogen leakage of the hydrogen fuel automobile based on constant volume dilution comprises the following steps:
s1, opening a gate 7, placing a vehicle 13 in a closed space constructed by the thermal insulation cabin 3, and then closing the gate 7;
s2, opening an air inlet valve 2, opening an air inlet fan 1, and purging air in the closed space; after purging, closing the air inlet fan 1 and the air inlet valve 2, and inflating the inflatable sealing ring 4 to fill gaps between the gate 7 and the heat-preserving cabin 3 after the inflatable sealing ring is inflated so as to avoid leakage of air in the closed space;
s3, starting a heat exchanger and a sunlight simulation system 8 in the heat preservation cabin body 3, and adjusting the temperature in the closed space to be within an allowable error range of the test temperature; starting an air pump to adjust the volume of the adjusting air bag 12, and adjusting the pressure in the closed space to the standard atmospheric pressure;
s4, standing the vehicle 13 in the closed space for more than 12 hours, and starting a leakage test;
s5, after the leakage test time expires, opening the exhaust valve 10, and starting the exhaust fan 5; then the air inlet valve 2 is opened to discharge the air in the closed space; wherein, while starting the exhaust fan 5, reading and recording the readings of the venturi flowmeter 9 and the hydrogen concentration analyzer 6 at a frequency of 1 s/time until the continuous 10s of the readings of the hydrogen concentration analyzer 6 is 0, stopping recording;
s6, calculating the leakage quantity of the hydrogen based on a hydrogen leakage quality quantitative method, wherein the specific calculation formula is as follows:
in the method, in the process of the invention,
is the leakage mass g of hydrogen in the closed space>
To correct the hydrogen density kg/m to the test temperature conditions 3 ，
For the flow rate m of the gas flowing through the venturi meter 9 3 /s，
Volume fraction 10 of hydrogen in the dilution tunnel detected by the hydrogen concentration analyzer 6 -6 。
The foregoing is merely exemplary embodiments of the present invention, and detailed technical solutions or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present invention, and these should also be regarded as the protection scope of the present invention, which does not affect the effect of the implementation of the present invention and the practical applicability of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (7)
1. System based on constant volume dilution continuous detection hydrogen fuel car hydrogen leakage, its characterized in that: the solar energy heat-insulation system comprises a heat-insulation cabin body used for constructing a closed space, wherein the heat-insulation cabin body is connected with an air inlet fan, a sunlight simulation system and an adjusting air bag; the air inlet fan is provided with a filtering device, and an air inlet valve for controlling air to enter the closed space is connected between the air inlet fan and the heat preservation cabin body; the sunlight simulation system is arranged at the top of the closed space and is used for simulating the illumination condition when the vehicle is parked outdoors; the adjusting air bag is used for adjusting the volume of the adjusting air bag in the closed space so as to keep the air pressure in the closed space stable; the heat preservation cabin body is also communicated with a constant volume dilution channel, one end of the constant volume dilution channel is arranged on the inner side of the closed space, and the other end of the constant volume dilution channel is connected with an exhaust fan; the exhaust fan is used for exhausting the mixture of leaked hydrogen and air in the closed space; the constant volume dilution channel is also connected with an exhaust valve, a hydrogen concentration analyzer and a venturi flowmeter, and the exhaust valve is used for controlling gas to be discharged out of the closed space; the venturi flowmeter is arranged between the exhaust valve and the exhaust fan, corrects the gas flow passing through the inner side of the venturi flowmeter according to the detected atmospheric pressure and temperature, and outputs the corrected real-time gas flow at the frequency of 1 Hz; the hydrogen concentration analyzer is arranged between the exhaust valve and the venturi flowmeter, and is used for detecting the hydrogen volume fraction in the constant volume dilution channel, and the heat preservation cabin body is also rotationally connected with a gate for opening or closing the closed space.
2. The system for continuously detecting hydrogen leakage of a hydrogen fuelled automobile based on constant volume dilution as claimed in claim 1 wherein: the heat-insulating cabin body is also connected with an inflatable sealing ring for sealing the gap between the vehicle entering and exiting the gate; when a vehicle needs to go in and out, the interior of the inflatable sealing ring is not inflated, so that the gate is opened and closed conveniently; when a vehicle enters the closed space and internal purging is completed, the inflatable sealing ring is inflated to avoid gas leakage in the closed space.
3. The system for continuously detecting hydrogen leakage of a hydrogen fuelled automobile based on constant volume dilution as claimed in claim 2 wherein: the heat-preserving cabin body comprises a temperature control and heat exchanger, and a heat exchange pipeline taking water as a working medium is arranged in the heat-preserving cabin body, so that the temperature in the body of the heat-preserving cabin body and the closed space is controlled within an allowable error range of the test temperature; the inside of the heat preservation cabin body is an aluminum plate or a stainless steel plate with polished surfaces so as to reduce the adsorption of hydrogen on the inner surface of the closed space.
4. The system for continuously detecting hydrogen leakage of a hydrogen fuelled automobile based on constant volume dilution as claimed in claim 3 wherein: the filter device is a HEPA efficient particulate matter filter element so as to remove particulate matters in the purge gas and prevent the particulate matters from accumulating at the air inlet valve.
5. The system for continuously detecting hydrogen leakage of a hydrogen fuelled automobile based on volumetric dilution as claimed in claim 4 wherein: the venturi flowmeter is a critical venturi tube or an array formed by circumferentially arranging a plurality of critical venturi tubes; under the suction effect of the exhaust fan, the gas in the closed space flows through the throat of the critical venturi tube at a local sound speed, and the flow rates of the gas in the critical venturi tube and the constant-volume dilution channel are basically constant due to the fact that the interception area at the throat is determined, the gas flow rates only slightly fluctuate with the atmospheric pressure and the temperature, and the influence of the fluctuation is corrected and compensated when the flow meter result is read after the test is finished.
6. The system for continuously detecting hydrogen leakage of a hydrogen fuelled automobile based on volumetric dilution as claimed in claim 5 wherein: the adjusting air bag is made of Teflon materials, and an air charging pipe of the adjusting air bag is connected with the air pump; when the air pressure in the closed space rises due to the rising of the temperature, the air pump pumps air to the outer side of the adjusting air bag, so that the volume is reduced; when the air pressure in the closed space is reduced due to the temperature decrease, the air pump inflates the inner side of the adjusting air bag, and the volume is increased so as to keep the air pressure in the closed space stable.
7. A method for detecting hydrogen gas leakage using the constant volume dilution based continuous hydrogen gas leakage detection system for hydrogen fuel automobiles as defined in claim 6, comprising the steps of:
s1, opening a gate, placing a vehicle in a closed space constructed by a thermal insulation cabin, and then closing the gate;
s2, opening an air inlet valve, opening an air inlet fan, and purging air in the closed space; after purging, closing the air inlet fan and the air inlet valve, and inflating the inflatable sealing ring to fill the gap between the gate and the heat-preserving cabin body after the inflatable sealing ring is inflated so as to avoid leakage of air in the closed space from the gap;
s3, starting a heat exchanger and a sunlight simulation system in the heat preservation cabin body, and adjusting the temperature in the closed space to be within an allowable error range of the test temperature; starting an air pump to adjust the volume of the adjusting air bag, and adjusting the pressure in the closed space to the standard atmospheric pressure;
s4, standing the vehicle in the closed space for more than 12 hours, and starting a leakage test;
s5, after the leakage test time expires, opening an exhaust valve, and starting an exhaust fan; then opening the air inlet valve to exhaust the air in the closed space; reading and recording the readings of the Venturi flowmeter and the hydrogen concentration analyzer at the frequency of 1 s/time while starting the exhaust fan until the continuous 10s of the readings of the hydrogen concentration analyzer is 0, and stopping recording;
s6, calculating the leakage quantity of the hydrogen based on a hydrogen leakage quality quantitative method, wherein the specific calculation formula is as follows:
in the method, in the process of the invention,
is the leakage mass g of hydrogen in the closed space>
To correct the hydrogen density kg/m to the test temperature conditions 3 ，
For the flow rate m of the gas flowing through the venturi meter 3 /s，
Volume fraction of hydrogen in dilution passage detected by hydrogen concentration analyzer 10 -6 。/>
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310209163.XA CN116147716A (en) | 2023-03-07 | 2023-03-07 | System and method for continuously detecting hydrogen leakage of hydrogen fuel automobile based on constant volume dilution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310209163.XA CN116147716A (en) | 2023-03-07 | 2023-03-07 | System and method for continuously detecting hydrogen leakage of hydrogen fuel automobile based on constant volume dilution |
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| Publication Number | Publication Date |
|---|---|
| CN116147716A true CN116147716A (en) | 2023-05-23 |
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| CN202310209163.XA Pending CN116147716A (en) | 2023-03-07 | 2023-03-07 | System and method for continuously detecting hydrogen leakage of hydrogen fuel automobile based on constant volume dilution |
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| CN (1) | CN116147716A (en) |
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- 2023-03-07 CN CN202310209163.XA patent/CN116147716A/en active Pending
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