CN114757015A - Safe distance determination method based on high-pressure hydrogen pipeline leakage accident - Google Patents

Safe distance determination method based on high-pressure hydrogen pipeline leakage accident Download PDF

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CN114757015A
CN114757015A CN202210285165.2A CN202210285165A CN114757015A CN 114757015 A CN114757015 A CN 114757015A CN 202210285165 A CN202210285165 A CN 202210285165A CN 114757015 A CN114757015 A CN 114757015A
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leakage
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周妮
李秀喜
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South China University of Technology SCUT
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Abstract

The invention discloses a safety distance determination method based on leakage accidents of a high-pressure hydrogen pipeline, which comprises the steps of establishing a three-dimensional physical model of the high-pressure hydrogen pipeline; carrying out numerical simulation on the leakage accidents according to different apertures to obtain the hydrogen leakage flow of the leakage accidents under different aperture conditions; establishing a three-dimensional space model taking a hydrogen injection area as a core; substituting the hydrogen leakage amount of the leakage accident under different aperture conditions into the three-dimensional space model, and performing hydrogen leakage diffusion simulation to obtain the explosion danger range of the leakage accident under the non-ignition state; calculating the flame size of the jet fire in the leakage and ignition state, and calculating the radiant heat flux of the leakage accident to obtain the dangerous range of heat radiation; and fitting an explosion danger range and a thermal radiation light injury radius calculation formula according to the simulation and calculation results. The invention can quickly analyze and predict the target pipeline small hole leakage accident and provides more accurate reference for the design and installation of the hydrogen pipeline and the safe evacuation of the accident.

Description

Safe distance determination method based on high-pressure hydrogen pipeline leakage accident
Technical Field
The invention relates to the field of hydrogen pipeline safety assessment, in particular to a safety distance determination method based on a high-pressure hydrogen pipeline leakage accident.
Background
The industrialization of hydrogen energy requires a mature hydrogen transportation infrastructure in order to maintain the same level of safety and convenience as the existing gasoline transportation infrastructure. The safe and efficient hydrogen transport infrastructure can support various production routes of hydrogen energy, and can be produced in large centralized factories or distributed in various hydrogenation stations and fixed power stations. Therefore, constructing a safe and efficient infrastructure for hydrogen storage and transportation and distribution is a significant problem that must be solved for the development of the hydrogen energy industry.
Pipeline transportation is used as a large basis for developing the hydrogen energy industry, and the hydrogen energy industry is often interfered by accidents, human errors, abnormal operation, equipment faults and the like while green energy is guaranteed to meet market demands, so that the research on hydrogen pipeline accidents for risk assessment is extremely important, accident disasters are analyzed and predicted in advance, and the safety distance is set.
Disclosure of Invention
In order to overcome the above disadvantages and shortcomings of the prior art, the present invention provides a method for determining a safe distance based on a high-pressure hydrogen pipeline leakage accident, which analyzes and predicts accident disasters in advance, sets a safe distance, and provides a more accurate reference for designing and installing a hydrogen pipeline and safely evacuating an accident.
The purpose of the invention is realized by the following technical scheme:
a safe distance determination method based on a high-pressure hydrogen pipeline leakage accident comprises the following steps:
(1) establishing a three-dimensional physical model of the high-pressure hydrogen pipeline by using Fluent software;
(2) performing numerical simulation on the leakage accident aiming at different apertures by using Fluent software and the three-dimensional physical model established in the step (1) to obtain the hydrogen leakage flow Q of the leakage accident under the condition of different aperturesmThe calculation formula is as follows:
Figure BDA0003559263900000021
in the formula, QmMass flow rate for the leak orifice; c0For leakage coefficient, the round hole is usually 1; dorIs the orifice equivalent diameter; p2Absolute pressure at the leak point; m is hydrogen molar mass; z is a compression factor; r is a universal gas constant; t is2Is the gas temperature at the leak point; k is the heat capacity ratio;
(3) establishing a three-dimensional space model taking a hydrogen injection area as a core in Fluent software;
(4) substituting the hydrogen leakage amount of the leakage accident under the condition of different apertures obtained in the step (2) into the three-dimensional space model obtained in the step (3), carrying out hydrogen leakage diffusion simulation, and fitting to obtain a calculation formula of the explosion danger range of the leakage accident under the non-ignition state;
(5) Calculating the flame size of the jet fire in a leakage and ignition state, calculating the radiant heat flux of a leakage accident by combining a weighted multi-point source model, and fitting to obtain a calculation formula of a thermal radiation danger range;
(6) and (5) determining the safety distance based on the leakage accident of the high-pressure hydrogen pipeline by combining the explosion danger range in the step (4) and the heat radiation danger range in the step (5).
Preferably, the size of the aperture in step (2) is not more than 20 mm.
Preferably, the required parameters of the three-dimensional space model in step (3) include leak hole size, operating pressure, ambient pressure and temperature.
Preferably, the establishing of the three-dimensional space model with the hydrogen injection region as a core in the step (3) specifically includes: and (3) dividing a three-dimensional space according to a free jet theory, determining a space with a proper size, and establishing a three-dimensional space model taking a hydrogen injection region as a core.
Preferably, the determining a space with a suitable size specifically includes:
and performing multiple times of simulation, adjusting the size of the space according to the result of the previous round of simulation, and determining the space with the proper size.
Preferably, the step (5) of calculating the flame size of the jet fire in the leakage and ignition state specifically comprises: the flame size H of the jet fire in the leak and ignition condition was calculated according to the following formula:
H/D＝1.9Q*2/5
Wherein D is the characteristic length of the injection hole; q*Is a dimensionless flame power.
Preferably, the calculation formula of the radiant heat flux of the leakage accident is as follows:
Figure BDA0003559263900000022
in the formula, qWMPRadiant heat flux received for the target point; q. q ofnN is more than or equal to 1 and less than or equal to N, and N is the number of point sources distributed along the axis of the flame; w is anThe weight of the radiation intensity of the nth point source; xRThe ratio of radiant heat to heat released by the flame is 0.1; LHV is combustion heat of hydrogen; tau isnIs the atmospheric transmission between the nth point source to the receiver; snThe distance from the nth point source to the receiver;
Figure BDA0003559263900000031
the angle between the line connecting the nth point source to the center of the receiver and the normal of the plane of the receiver.
Preferably, the length L of the flame axisSCalculated by the following formula:
LS＝β×Lf
in the formula, LfThe height of visible light is the height of visible light; beta is a scaling parameter.
Preferably, LfCalculated by the following formula:
Lf＝H-S
wherein H is the flame size; and S is the flame lifting distance.
Preferably, S is calculated by the following formula:
Figure BDA0003559263900000032
wherein u is the injection rate of hydrogen; c is an empirical constant, 2.65 x 10 is taken-5S。
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the safe distance determining method based on the leakage accident of the high-pressure hydrogen pipeline, the explosion danger range related to the leakage aperture and the safe distance calculation formula required by personnel and equipment are obtained by researching the leakage diffusion and the fire spraying accident of the hydrogen pipeline in the small hole leakage range, the target pipeline small hole leakage accident can be rapidly analyzed and predicted, and more accurate reference is provided for the design and installation of the hydrogen pipeline and the safe evacuation of the accident occurrence.
Drawings
Fig. 1 is a schematic flow chart of a safety distance determination method based on a leakage accident of a high-pressure hydrogen pipeline according to an embodiment of the present invention.
Fig. 2 is a three-dimensional schematic diagram of a pipeline constructed by the method for determining the safety distance based on the leakage accident of the high-pressure hydrogen pipeline according to the embodiment of the invention.
Fig. 3 is a schematic diagram of a weighted multi-point source model calculation of a leakage accident with an aperture of 10mm in a safety distance determination method based on a leakage accident of a high-pressure hydrogen pipeline according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating a radiant heat flux of a leakage accident with a 10mm aperture in a safety distance determination method based on a leakage accident of a high-pressure hydrogen pipe, according to an embodiment of the present invention, as a function of distance.
Fig. 5 is a schematic diagram of the variation of the radiant heat flux of the fire jet in the small hole leakage accident with the horizontal distance in the safety distance determination method based on the leakage accident of the high-pressure hydrogen pipeline according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Examples
As shown in fig. 1, the method for determining the safe distance based on the leakage accident of the high-pressure hydrogen pipeline of the embodiment includes the following steps:
(1) establishing a three-dimensional physical model of the high-pressure hydrogen pipeline by using Fluent software;
(2) Numerical simulation is carried out on the leakage accidents according to different apertures by using Fluent software and the three-dimensional physical model established in the step (1), and hydrogen leakage amounts of the leakage accidents under different aperture conditions are obtained;
(3) establishing a three-dimensional space model taking a hydrogen injection area as a core in Fluent software;
(4) substituting the hydrogen leakage amount of the leakage accident under different aperture conditions obtained in the step (2) into the three-dimensional space model obtained in the step (3) to perform hydrogen leakage diffusion simulation to obtain the explosion danger range of the leakage accident under the unignited state;
(5) calculating the flame size of the jet fire in a leakage and ignition state, and calculating the radiant heat flux of a leakage accident by combining a weighted multipoint source model to obtain a thermal radiation danger range;
(6) and (5) determining the safety distance based on the leakage accident of the high-pressure hydrogen pipeline by combining the explosion danger range in the step (4) and the heat radiation danger range in the step (5).
In this embodiment, the three-dimensional physical model established in step (1) is shown in fig. 2, where the basic parameters of the hydrogen gas pipeline are shown in table 1:
TABLE 1 basic parameters of hydrogen pipeline
Length of the tube Pipe diameter Wall thickness Pipe material Temperature of Operating pressure Flow rate of flow Pressure at leak point Leakage point location Type of leakage
3m 400mm 11.1mm Steel pipe 298K 2.5mPa(g) 12.6m·s-1 101.325kpa The middle part of the pipeline is upward Small hole leakage
In this embodiment, the size of the aperture in step (2) is divided from 2mm every 2mm until 20mm, and the Fluent is used to simulate the leakage accident of the small holes of the pipeline with different apertures, so as to obtain the mass flow rate of hydrogen leakage under the aperture condition, as shown in table 2:
TABLE 2 Hydrogen leakage Mass flow
Pore diameter mm 2 4 6 8 10 12 14 16 18 20
Mass flow rate kg/s 0.0041 0.0165 0.0373 0.0667 0.1047 0.1499 0.2044 0.2679 0.3377 0.4205
In this embodiment, the establishing of the three-dimensional space model with the hydrogen injection region as a core in the step (3) specifically includes: the required parameters include leak hole size, operating pressure, ambient pressure and temperature. And (3) dividing a three-dimensional space according to a free jet theory, determining a space with a proper size, and establishing a three-dimensional space model taking a hydrogen injection region as a core. And performing multiple times of simulation, adjusting the space size according to the result of the previous round of simulation, and finally determining the space size of the leakage diffusion to be 10mx10mx10 m.
In this embodiment, the process of determining the explosion risk range in step (4) is as follows:
since the explosion limit of hydrogen is 4% and 75% (by volume fraction) and the concentration of hydrogen is lower as the pipeline leaks out, the explosion danger area is divided by selecting the volume fraction of hydrogen of 4% as a judgment basis. And (3) carrying out post-processing on the Fluent result by utilizing the tecplot360 to obtain a coordinate extreme value of the target concentration, wherein the summarized value of the explosion dangerous area of the leakage accident of the small hole of the pipeline is shown in a table 3.
TABLE 3 explosion hazard area for hydrogen pipeline leakage
Figure BDA0003559263900000051
The simulation result is analyzed, the explosion hazard range formed by the leakage and diffusion of the small holes of the hydrogen pipeline presents an increasing trend along with the increase of the hole diameter, the simulation result is fitted, and an explosion hazard range calculation formula related to the leakage hole diameter is obtained as follows:
Re＝0.0065dor 2+0.3059dor+0.2362
in the formula, ReFor the explosion hazard range of hydrogen leakage, dorIs the leak pore size.
When the leakage hole diameter is 20mm, the explosion danger range is the largest and reaches 9.0464 m. In order to prevent the combustible mixture formed by the leakage accident of the small hole of the pipeline from being ignited, the safe distance between a fire source or other devices with ignition hidden troubles and the hydrogen pipeline is more than 10 m.
In this embodiment, the step (5) of calculating the flame size of the jet fire in the leaked and ignited state specifically includes: the flame size H of the jet fire in the leak and ignition condition was calculated according to the following formula:
H/D＝1.9Q*2/5
wherein D is the characteristic length of the injection hole; q*Dimensionless flame power;
wherein
Figure BDA0003559263900000052
(wherein,
Figure BDA0003559263900000053
is the rate of heat release, CpSpecific heat of fuel at atmospheric pressure, TaIs ambient temperature; rhojFuel density at atmospheric pressure).
Bringing the hydrogen leakage mass flow into a dimensionless flame power Q*In the formula, the dimensionless flame power Q is added *The fitting correlation with the dimensionless flame impingement distance (H/D) was calculated, and the obtained correlation parameters are shown in table 4:
TABLE 4 parameters relating to hydrogen leak injection fire
Bore diameter mm Q* Q*2/5 H/D
2 2966009 388.03 737.26
4 2115727 338.99 644.08
6 1733061 312.99 594.67
8 1508950 296.12 562.63
10 1356895 283.80 539.23
12 1231539 273.01 518.72
14 1142248 264.91 503.34
16 1072191 258.29 490.75
18 1006814 251.87 478.56
20 963364 247.47 470.19
The summarized flame size is shown in table 5, in combination with a semi-empirical correlation of the relevant parameters of the flaming fire and the distances to be pushed:
TABLE 5 flame size of the jet fire
Pore diameter mm Flame impact distance m Push distance m Length m of visible light
2 1.4745 0.0165 1.4580
4 2.5763 0.0167 2.5596
6 3.568 0.0167 3.5513
8 4.501 0.0168 4.4842
10 5.3923 0.0169 5.3754
12 6.2246 0.0168 6.2078
14 7.0467 0.0168 7.0299
16 7.852 0.0169 7.8351
18 8.614 0.0168 8.5972
20 9.4037 0.0170 9.3867
In this embodiment, the determination of the fire accident safety distance requires thermal radiation calculation, and the weighted multi-point source model (WMP) considers that thermal radiation received by a target point is emitted from N point sources distributed along the flame axis, where the length of the axis is LS(LS＝β×LfWhere β is a scaling parameter); the calculation formula of the radiant heat flux of the leakage accident is as follows:
Figure BDA0003559263900000071
in the formula, qWMPRadiant heat flux received for the target point; q. q.snN is more than or equal to 1 and less than or equal to N, and N is the number of point sources distributed along the axis of the flame; w is anThe weight of the radiation intensity of the nth point source; xRThe ratio of radiant heat to heat released by the flame is 0.1; LHV is combustion heat of hydrogen; tau isnIs the atmospheric transmission between the nth point source to the receiver; snThe distance from the nth point source to the receiver;
Figure BDA0003559263900000072
The angle between the line connecting the nth point source to the center of the receiver and the normal of the plane of the receiver.
Length L of the flame axisSCalculated by the following formula:
LS＝β×Lf
in the formula, LfThe height of visible light is the height of visible light; beta is a scaling parameter.
LfCalculated by the following formula:
Lf＝H-S
wherein H is the flame size; and S is the flame lifting distance.
The S is calculated by the following formula:
Figure BDA0003559263900000073
wherein u is the injection rate of hydrogen; c is an empirical constant, 2.65 x 10 is taken-5S。
In this embodiment, the distribution rule of the weights of the various points is increased and then decreased from bottom to top along the central axis of the flame, and the calculation formula is as follows:
wn＝nw1 for n＝1,…,np
Figure BDA0003559263900000074
for n＝np+1,…,N
Figure BDA0003559263900000075
in the formula, npThe point source whose weight is maximized.
In the embodiment, the heat radiation calculation formula of the jet fire impact distance and the weighted multi-point source model calculates the radiant heat flux caused by the jet fire accident due to the small hole leakage of the high-pressure hydrogen pipeline, and summarizes 0.085L f5m range (flame width is likely to extend to 0.17LfLeft and right) are uniformly distributed, and fitting is carried out on the thermal radiation data of the small hole leakage fire injection accident to obtain a variation formula of the thermal radiation flux along with the horizontal distance. Suggest np0.75N, i.e. the weight rises linearly from zero, reaches a maximum at about 75% of the height of the flame, and then falls linearly to zero; the prior person combines theoretical calculation and experimental data to reversely derive the optimal point source number N-7 and the optimal scaling parameter beta-2.25.
Calculating the flame heat radiation caused by the small hole leakage fire spraying accident of the high-pressure hydrogen pipeline by combining the flame size and a weighted multipoint source model, taking the aperture of 10mm as an example:
n is 7, Np＝0.75N，LSThe position and the heat radiation weight distribution of the 7 point sources obtained by the formula of 12.0947m substitution point source position calculation formula and the formula of weight calculation are as follows:
Z1＝0.8639，Z2＝2.5917,Z3＝4.3195,Z4＝6.0474,Z5＝7.7752,Z6＝9.5030,Z7＝11.2308；
w1＝0.04762，w2＝0.09524，w3＝0.14286，w4＝0.19048，w5＝0.2381。w6＝0.2381，w7＝0.0476。
the horizontal distances from the ejection openings were calculated to be 0.085L, respectivelyf(flame width is typically 0.17Lf) Uniformly distributed positions within 5m (as shown in FIG. 3)The received radiant heat flux.
With R1The radiant heat flux at (a) is calculated as an example:
Figure BDA0003559263900000081
by analogy, calculate R2～R7The radiant heat flux of (a) is,
Figure BDA0003559263900000082
Figure BDA0003559263900000083
Figure BDA0003559263900000084
a calculation of radiant heat flux versus distance for a 10mm pore size hydrogen leak jet fire was obtained by fitting, as shown in fig. 4.
The minimum radiant heat flux which is harmful to human body is 4.0kW/m2And the calculation is carried out by substituting the calculated result into the fitting formula, so that when a 10mm leakage fire spraying accident occurs to the high-pressure hydrogen pipeline, the radius of light injury of the generated heat radiation to people is 2.19 m. And for the equipment, the minimum radiant heat flux ignited is 18kW/m2And because the heat radiation emitted by the leakage and fire injection accident of the high-pressure hydrogen pipeline with the aperture of 10mm cannot reach the lowest ignition heat flux, the ignition radius of the equipment by the heat radiation is not considered.
In the embodiment, the radiant heat flux generated by the fire spraying accident in the small hole leakage range is calculated and summarized to be 0.085LfThe radiant heat flux of the fire in the range of 5m is shown in figure 5.
The lowest radiant heat flux causing injury to the human body is substituted into the horizontal distance-radiant heat flux fitting formula, and the minor injury radius (i.e. the thermal radiation danger range) of the human body is summarized, and the results are shown in table 6:
TABLE 6 thermal radiation light injury radius of jet fire
Leak pore diameter/mm 2 4 6 8 10 12 14 16 18 20
Radius of minor injury/m 0.29 0.68 1.13 1.62 2.19 2.70 3.39 4.14 4.76 5.30
Fitting is carried out according to the personnel soft-cut radius data to obtain a personnel soft-cut radius calculation formula related to the leakage aperture, and the following steps are carried out:
Ri＝0.0826dor 1.4198
in the formula, RiThe hydrogen is sprayed to the fire and heat radiation to slightly damage the radius dorIs the leak pore size.
The risk prevention is carried out only by using the leakage of the small holes of the hydrogen pipeline to spray fire accidents, and the safety distance of the personnel to go is 6 m. The radiant heat flux of the jet fire cannot reach the lowest radiant heat flux (18 kW/m) for igniting other equipment due to small hole leakage2) Therefore, the reason that the jet fire causes danger to other equipment is the direct contact of flame entities, and the safe distance between the equipment and the hydrogen pipeline is up to 10m by combining the impact distance data of the jet fire.
The embodiment can conclude that combustible gas mixture possibly exists in the range of 9m from the pipeline as the axis to the outer wall of the pipeline when the small hole leakage accident of the hydrogen pipeline occurs, the direct impact distance of the generated jet fire can reach 9.4m at most when the combustible gas generated by leakage is ignited, and the maximum soft damage radius caused by the heat radiation can reach 5.3 m. Therefore, the safety distance of the equipment can reach 9.4m, and the safety distance of personnel can reach 5.3 m.
In the embodiment, according to the conventional pipeline accident data, the small hole leakage is selected as the hydrogen pipeline accident cause, and the risk is estimated by taking the high-occurrence fire spraying accident as the accident consequence. By researching the leakage diffusion of the hydrogen pipeline and the fire spraying accident in the small hole leakage range, the explosion danger range related to the leakage aperture and the safety distance calculation formula required by personnel and equipment are obtained, the target pipeline small hole leakage accident can be quickly analyzed and predicted, and more accurate reference is provided for the design and installation of the hydrogen pipeline and the safe evacuation of the accident occurrence.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. A safe distance determination method based on a high-pressure hydrogen pipeline leakage accident is characterized by comprising the following steps:
(1) establishing a three-dimensional physical model of the high-pressure hydrogen pipeline by using Fluent software;
(2) performing numerical simulation on the leakage accident aiming at different apertures by using Fluent software and the three-dimensional physical model established in the step (1) to obtain the hydrogen leakage flow Q of the leakage accident under the condition of different apertures mThe calculation formula is as follows:
Figure FDA0003559263890000011
in the formula, QmMass flow for the leak orifice; c0Taking 1 as a circular hole for leakage coefficient; d is a radical oforIs the orifice equivalent diameter; p is2Absolute pressure at the leak point; m is hydrogen molar mass; z is a compression factor; r is a universal gas constant; t is2Is the gas temperature at the leak point; k is the heat capacity ratio;
(3) establishing a three-dimensional space model taking a hydrogen injection area as a core in Fluent software;
(4) substituting the hydrogen leakage amount of the leakage accident under the condition of different apertures obtained in the step (2) into the three-dimensional space model obtained in the step (3), carrying out hydrogen leakage diffusion simulation, and fitting to obtain a calculation formula of the explosion danger range of the leakage accident under the non-ignition state;
(5) calculating the flame size of the jet fire in a leakage and ignition state, calculating the radiant heat flux of a leakage accident by combining a weighted multi-point source model, and fitting to obtain a calculation formula of a heat radiation danger range;
(6) and (5) determining the safety distance based on the leakage accident of the high-pressure hydrogen pipeline by combining the explosion danger range in the step (4) and the heat radiation danger range in the step (5).
2. The safe distance determination method based on the leakage accident of the high-pressure hydrogen pipeline according to claim 1, wherein the size of the hole diameter in the step (2) is not more than 20 mm.
3. The method for determining the safety distance based on the leakage accident of the high pressure hydrogen pipeline according to claim 1, wherein the required parameters of the three-dimensional space model in the step (3) comprise a leakage hole size, an operating pressure, an ambient pressure and a temperature.
4. The safe distance determination method based on the leakage accident of the high-pressure hydrogen pipeline according to claim 1, wherein the step (3) is to establish a three-dimensional space model with a hydrogen injection area as a core, specifically: and (3) carrying out three-dimensional space division according to a free jet theory, determining a space with a proper size, and establishing a three-dimensional space model taking a hydrogen injection region as a core.
5. The safe distance determination method based on the leakage accident of the high-pressure hydrogen pipeline according to claim 4, characterized in that the determination of the space with the proper size is specifically as follows:
and (5) carrying out multiple times of simulation, adjusting the space size according to the result of the previous round of simulation, and determining the space with the proper size.
6. The method for determining the safe distance based on the leakage accident of the high-pressure hydrogen pipeline according to claim 1, wherein the step (5) of calculating the flame size of the jet fire in the leakage and ignition state is specifically as follows: the flame size H of the jet fire in the leak and ignition condition was calculated according to the following formula:
H/D＝1.9Q*2/5
Wherein D is the characteristic length of the injection hole; q*Is a dimensionless flame power.
7. The safe distance determination method based on the high-pressure hydrogen pipeline leakage accident according to claim 6, characterized in that the calculation formula of the radiant heat flux of the leakage accident is as follows:
Figure FDA0003559263890000021
in the formula, qWMPRadiant heat flux received for the target point; q. q.snN is more than or equal to 1 and less than or equal to N, and N is the number of point sources distributed along the axis of the flame; w is anThe weight of the radiation intensity of the nth point source; xRThe ratio of radiant heat to heat released by the flame is 0.1; LHV is combustion heat of hydrogen; tau isnIs the atmospheric transmission between the nth point source to the receiver; snThe distance from the nth point source to the receiver;
Figure FDA0003559263890000023
the angle between the line connecting the nth point source to the center of the receiver and the normal of the plane of the receiver.
8. The method of claim 7, wherein the length L of the flame axis is greater than the length L of the flame axisSCalculated by the following formula:
LS＝β×Lf
in the formula, LfThe height of visible light is the height of visible light; beta is a scaling parameter.
9. The safe distance determination method based on the leakage accident of the high pressure hydrogen pipeline according to claim 8, wherein L is fCalculated by the following formula:
Lf＝H-S
wherein H is the flame size; and S is the flame lifting distance.
10. The safe distance determination method based on the leakage accident of the high pressure hydrogen pipe according to claim 9, wherein S is calculated by the following formula:
Figure FDA0003559263890000022
wherein u is the injection rate of hydrogen; c is an empirical constant, 2.65 x 10 is taken-5S。
CN202210285165.2A 2022-03-22 2022-03-22 Safe distance determination method based on high-pressure hydrogen pipeline leakage accident Pending CN114757015A (en)

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CN115342989A (en) * 2022-07-21 2022-11-15 北京大学 Method and device for measuring hydrogen leakage amount
CN115358169A (en) * 2022-10-21 2022-11-18 合肥工业大学 Automobile hydrogen storage tank TPRD (thermal pressure rubber device) discharge risk early warning method based on numerical simulation
CN115607875A (en) * 2022-09-27 2023-01-17 浙江浙能航天氢能技术有限公司 Whole station type nitrogen explosion suppression system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115342989A (en) * 2022-07-21 2022-11-15 北京大学 Method and device for measuring hydrogen leakage amount
CN115342989B (en) * 2022-07-21 2024-05-28 北京大学 Hydrogen leakage amount measuring method and measuring device
CN115081359A (en) * 2022-08-19 2022-09-20 南京南工应急科技有限公司 Dangerous chemical fire thermal radiation damage analysis system
CN115607875A (en) * 2022-09-27 2023-01-17 浙江浙能航天氢能技术有限公司 Whole station type nitrogen explosion suppression system
CN115358169A (en) * 2022-10-21 2022-11-18 合肥工业大学 Automobile hydrogen storage tank TPRD (thermal pressure rubber device) discharge risk early warning method based on numerical simulation
CN115358169B (en) * 2022-10-21 2023-02-10 合肥工业大学 Automobile hydrogen storage tank TPRD (thermal Plastic pressure detector) discharge risk early warning method based on numerical simulation

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