CN115638938A - Leakage protection distance measuring system and method based on positioning monitoring - Google Patents

Leakage protection distance measuring system and method based on positioning monitoring Download PDF

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CN115638938A
CN115638938A CN202211331979.1A CN202211331979A CN115638938A CN 115638938 A CN115638938 A CN 115638938A CN 202211331979 A CN202211331979 A CN 202211331979A CN 115638938 A CN115638938 A CN 115638938A
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diffusion
leakage
ground
parameter
reference value
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王三明
余文翟
高婷婷
周广东
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Nanjing Safety Worry Free Network Technology Co ltd
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Nanjing Safety Worry Free Network Technology Co ltd
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Abstract

The invention discloses a leakage protection distance measuring system and method based on positioning monitoring, which comprises an input module, a diffusion parameter reference value determining module, an atmospheric diffusion parameter determining module related to the effective roughness length of the ground, an atmospheric diffusion parameter determining module related to leakage time, a gas leakage diffusion model module, a leakage diffusion hazard radius determining module and an output module, wherein the diffusion parameter reference value is obtained by adopting a Tennel method according to meteorological conditions and geographic conditions, and a gas leakage diffusion model is established according to wind speed, wind direction, leakage sources and atmospheric diffusion parameters; and determining the leakage diffusion hazard radius according to the gas leakage diffusion model. According to the invention, the concentration of the leaked gas and the leakage diffusion damage radius can be obtained according to the meteorological condition, the geographic condition and the diffusion time, so that the problem of difficulty in acquiring field monitoring data is avoided.

Description

Leakage protection distance measuring system and method based on positioning monitoring
Technical Field
The invention relates to a leakage protection distance measuring system and method based on positioning monitoring, and belongs to the technical field of leakage monitoring and prediction.
Background
When a dangerous gas leakage accident occurs, the determination of the leakage position and the leakage source intensity is one of the bases and bases for establishing an emergency scheme. In general, emergency personnel cannot directly determine the leakage position and measure the leakage source strength due to the limiting factors such as safety, terrain and time. At the moment, the accident site and the periphery are monitored through the inherent monitoring device or the portable movable monitoring equipment, the position and the intensity of the accident source, the influence range, the degree and the like are determined by combining the acquired monitoring data with a back calculation method, reasonable guidance can be provided for formulating disaster escape routes and rescue measures, and the method has certain guiding significance on occasions such as gas leakage emergency monitoring, air pollution source tracing back check and the like.
(1) Method of probability statistics
And (3) carrying out statistical analysis by using different algorithms according to the numerical distribution rule of atmospheric diffusion, thereby reflecting the position or source intensity of the leakage source. The theoretical basis is bayes' theorem. And obtaining posterior probability distribution of the parameters by using the prior information of the parameters to be solved and actual observation data, and sampling the posterior probability distribution to obtain an estimated value of the parameters to be solved.
(2) Optimization theory method
And constructing a proper objective function and calculating an optimal solution of the objective function. In the optimized leakage source parameter back calculation, the accident is simulated through a diffusion model, and the simulation result of the model is compared with the measurement result to establish an objective function. The objective function is optimized through various optimization algorithms, and the source parameters are continuously adjusted, so that the calculation result and the measurement result can be better matched (the matching degree is quantified by the objective function).
The optimization model method is used for researching the leakage source inverse calculation problem and is summarized as the matching degree of the calculated concentration obtained by the diffusion mode (Gaussian model) and the actual observed concentration, namely the optimization solution of the objective function. The optimization algorithm involved is as follows: genetic Algorithm (GA), simulated Annealing (SA), particle swarm algorithm (PSO), pattern search, and the like.
(3) Machine learning algorithm
For example, an artificial neural network is established, adaptive dimensions and weights are set, and the correlation between the source strength and the concentration is obtained through a training network (a large amount of reliable data is needed to train the network) according to a large amount of actual measurement data (the measured concentration and the corresponding source strength value). And after the training is finished, calculating the source intensity reversely. The model and meteorological data such as diffusion parameters, stability and the like are not required to be known in advance.
The input vector is monitoring data of the sensor array, and the output vector is a description variable of the leakage condition. Each leakage source is provided with corresponding output variables which respectively represent leakage position, leakage area, leakage time and leakage quantity (leakage rate when continuous leakage occurs). In the process of research, a group of output vectors are used for representing the leakage probability of a plurality of storage tanks, and in the case of single leakage, if only one output quantity close to 1 appears in the output vectors, and the other output quantities are all close to 0, the position of the leakage tank can be judged.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problem of difficulty in acquiring field monitoring data, the invention provides a leakage protection distance measuring system and method based on positioning monitoring.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a leakage protection distance measuring method based on positioning monitoring comprises the following steps:
step 1, obtaining a diffusion parameter reference value by adopting a Ternal method according to meteorological conditions and geographic conditions.
And 2, determining atmospheric diffusion parameters related to the effective roughness length of the ground according to the effective roughness length of the ground and the diffusion parameter reference value.
And 3, determining the atmospheric diffusion parameter related to the leakage time according to the leakage time and the diffusion parameter reference value.
And 4, establishing a gas leakage diffusion model according to the wind speed, the wind direction, the leakage source, the atmospheric diffusion parameter related to the effective roughness length of the ground and the atmospheric diffusion parameter related to the leakage time.
And 5, determining the leakage diffusion damage radius according to the gas leakage diffusion model.
Preferably: in the step 1, a method for obtaining a diffusion parameter reference value by adopting a Ternal method according to meteorological conditions and geographic conditions comprises the following steps:
Figure 840009DEST_PATH_IMAGE001
Figure 52815DEST_PATH_IMAGE002
wherein the content of the first and second substances,
Figure 102811DEST_PATH_IMAGE003
indicating a reference value of a lateral wind direction dispersion parameter
Figure 500294DEST_PATH_IMAGE004
、
Figure 635741DEST_PATH_IMAGE005
Representing a lateral diffusion parameter power function coefficient;
Figure 150773DEST_PATH_IMAGE004
、
Figure 55275DEST_PATH_IMAGE006
representing the coefficients of a power function of a vertical diffusion parameter,
Figure 764605DEST_PATH_IMAGE007
the distance in the down-wind direction is indicated,
Figure 511982DEST_PATH_IMAGE008
indicating a vertical diffusion parameter reference value.
Preferably: in step 2, determining atmospheric diffusion parameters related to the effective roughness length of the ground according to the effective roughness length of the ground and the reference value of the diffusion parameters:
(1) When the ground is effectiveLength of roughness Z 0 When the grain size is less than or equal to 0.1 m:
Figure 66591DEST_PATH_IMAGE009
Figure 589714DEST_PATH_IMAGE010
wherein, the first and the second end of the pipe are connected with each other,
Figure 204366DEST_PATH_IMAGE011
represents a downwind atmospheric diffusion parameter related to the effective roughness length of the ground,
Figure 439038DEST_PATH_IMAGE012
represents a lateral wind direction diffusion parameter related to the effective roughness length of the ground,
Figure 797338DEST_PATH_IMAGE013
represents a vertical diffusion parameter related to the effective roughness length of the ground,
Figure 942012DEST_PATH_IMAGE003
indicating a reference value of a lateral wind direction dispersion parameter
Figure 960521DEST_PATH_IMAGE008
A reference value of a vertical diffusion parameter is indicated,
Figure 823435DEST_PATH_IMAGE014
representing the effective roughness length of the ground.
(2) As the effective roughness length Z of the ground 0 When the particle size is more than or equal to 0.1 m:
Figure 844481DEST_PATH_IMAGE015
Figure 843661DEST_PATH_IMAGE016
Figure 534536DEST_PATH_IMAGE017
Figure 135280DEST_PATH_IMAGE018
wherein, the first and the second end of the pipe are connected with each other,
Figure 960016DEST_PATH_IMAGE019
a feature fit function representing the extent of diffusion and the magnitude of the velocity in the x-direction,
Figure 813703DEST_PATH_IMAGE007
the distance in the down-wind direction is indicated,
Figure 941059DEST_PATH_IMAGE014
the effective roughness length of the ground is expressed,
Figure 512986DEST_PATH_IMAGE020
、
Figure 249735DEST_PATH_IMAGE021
、
Figure 348141DEST_PATH_IMAGE022
、
Figure 646399DEST_PATH_IMAGE023
、
Figure 440042DEST_PATH_IMAGE024
、
Figure 481948DEST_PATH_IMAGE025
、
Figure 434860DEST_PATH_IMAGE026
which represents the coefficient of atmospheric stability of the air,
Figure 402554DEST_PATH_IMAGE027
a feature quantity fitting function representing the extent of diffusion in the y-direction and the magnitude of the velocity,
Figure 949073DEST_PATH_IMAGE028
a feature quantity fitting function representing the extent of diffusion and the magnitude of velocity in the z direction,
Figure 529090DEST_PATH_IMAGE011
represents a downwind atmospheric diffusion parameter related to the effective roughness length of the ground,
Figure 211875DEST_PATH_IMAGE012
represents a lateral wind direction diffusion parameter related to the effective roughness length of the ground,
Figure 976569DEST_PATH_IMAGE013
represents a vertical diffusion parameter related to the effective roughness length of the ground,
Figure 243340DEST_PATH_IMAGE003
a reference value of a lateral wind direction dispersion parameter is shown,
Figure 627048DEST_PATH_IMAGE008
a reference value of a vertical diffusion parameter is indicated,
Figure 164339DEST_PATH_IMAGE014
representing the ground effective roughness length.
Preferably: and 3, determining the atmospheric diffusion parameter related to the leakage time according to the leakage time and the diffusion parameter reference value:
Figure 99934DEST_PATH_IMAGE029
Figure 355466DEST_PATH_IMAGE030
wherein, the first and the second end of the pipe are connected with each other,
Figure 47260DEST_PATH_IMAGE031
indicating a downwind atmospheric diffusion parameter associated with the leak time,
Figure 439058DEST_PATH_IMAGE032
represents a lateral wind direction dispersion parameter related to the leakage time,
Figure 686500DEST_PATH_IMAGE033
a vertical diffusion parameter related to the leakage time is indicated,
Figure 553962DEST_PATH_IMAGE034
the time of the leak is indicated,
Figure 545051DEST_PATH_IMAGE003
a reference value of a lateral wind direction dispersion parameter is shown,
Figure 821050DEST_PATH_IMAGE008
indicating a vertical diffusion parameter reference value.
Preferably: and 4, the gas leakage diffusion model in the step 4 comprises a continuous point source gas leakage diffusion model and an instant gas leakage diffusion model.
Continuous point source gas leakage diffusion model:
Figure 380338DEST_PATH_IMAGE035
Figure 876041DEST_PATH_IMAGE036
in the formula:
Figure 264297DEST_PATH_IMAGE037
representing a continuous point source gas leak diffusion concentration,
Figure 535748DEST_PATH_IMAGE038
the coordinates of the spatial position are represented,xindicating the distance from the discharge point of the leakage source to any point in the downwind direction；yThe distance from the central axis of the smoke to any point in the right-angle horizontal direction is represented;zindicating the height from the surface of the earth to any point,
Figure 390571DEST_PATH_IMAGE039
representing the mass flow of material being discharged continuously,
Figure 107992DEST_PATH_IMAGE012
represents a lateral wind direction dispersion parameter related to the leakage time,
Figure 299938DEST_PATH_IMAGE013
a vertical diffusion parameter related to the leakage time is indicated,
Figure 691474DEST_PATH_IMAGE040
which is indicative of the average wind speed of the environment,
Figure 982778DEST_PATH_IMAGE041
indicating the effective height of the source of the leak.
Instantaneous gas leakage diffusion model:
Figure 187495DEST_PATH_IMAGE042
Figure 82333DEST_PATH_IMAGE043
wherein, the first and the second end of the pipe are connected with each other,
Figure 423316DEST_PATH_IMAGE044
indicating the instantaneous gas leak diffusion concentration,
Figure 354363DEST_PATH_IMAGE045
which is indicative of the mass of material being discharged instantaneously,
Figure 780796DEST_PATH_IMAGE046
which is indicative of the time of day,
Figure 954026DEST_PATH_IMAGE038
the coordinates of the spatial position are represented,xthe distance from the discharge point of the leakage source to any point in the downwind direction is shown;ythe distance from the central axis of the smoke to any point in the right-angle horizontal direction is represented;zindicating the height from the surface of the earth to any point,
Figure 149515DEST_PATH_IMAGE031
indicating a downwind atmospheric diffusion parameter associated with the leak time,
Figure 517043DEST_PATH_IMAGE032
represents a lateral wind direction dispersion parameter related to the leakage time,
Figure 555406DEST_PATH_IMAGE033
a vertical diffusion parameter related to the leakage time is indicated,
Figure 502633DEST_PATH_IMAGE040
which is indicative of the average wind speed of the environment,
Figure 316743DEST_PATH_IMAGE041
indicating the effective height of the source of the leak.
Preferably, the following components: the method for determining the leakage diffusion hazard radius according to the gas leakage diffusion model in the step 5 comprises the following steps:
downwind distance:
Figure 324013DEST_PATH_IMAGE047
wherein, the first and the second end of the pipe are connected with each other,
Figure 990618DEST_PATH_IMAGE007
the distance in the down-wind direction is indicated,
Figure 866170DEST_PATH_IMAGE040
which is indicative of the average wind speed of the environment,
Figure 36251DEST_PATH_IMAGE048
indicating the diffusion time.
Distance from downwind
Figure 978537DEST_PATH_IMAGE007
Substituting the model into the gas leakage diffusion model, and making y =0, the gas leakage diffusion concentration C is obtained.
Leak diffusion hazard radius squared:
Figure 601280DEST_PATH_IMAGE049
wherein the content of the first and second substances,
Figure 280523DEST_PATH_IMAGE050
represents the leak diffusion hazard radius squared (m) 2 ），
Figure 305111DEST_PATH_IMAGE051
Is the diffusion coefficient in the y-direction,
Figure 919763DEST_PATH_IMAGE052
the concentration of the hazardous substances is shown,
Figure 534196DEST_PATH_IMAGE053
indicating gas leak diffusion concentration
Leak diffusion hazard radius:
Figure 751550DEST_PATH_IMAGE054
wherein, the first and the second end of the pipe are connected with each other,
Figure 896224DEST_PATH_IMAGE055
indicating the leak diffusion hazard radius.
The utility model provides a leakage protection distance survey system based on positioning monitoring, includes input module, diffusion parameter benchmark confirm module, atmospheric diffusion parameter confirm module relevant with the effective roughness length in ground, atmospheric diffusion parameter confirm module relevant with the leakage time, gas leakage diffusion model module, leakage diffusion harm radius confirm module, output module, wherein:
the input module is used for inputting meteorological conditions, geographic conditions and diffusion time.
The diffusion parameter reference value determining module is used for obtaining a diffusion parameter reference value by adopting a Ternal method according to meteorological conditions and geographic conditions.
The atmospheric diffusion parameter determination module related to the effective roughness length of the ground is used for determining atmospheric diffusion parameters related to the effective roughness length of the ground according to the effective roughness length of the ground and a diffusion parameter reference value.
And the atmospheric diffusion parameter determining module related to the leakage time is used for determining the atmospheric diffusion parameter related to the leakage time according to the leakage time and the diffusion parameter reference value.
The gas leakage diffusion model module is used for obtaining the gas leakage diffusion concentration by utilizing a gas leakage diffusion model according to the input meteorological condition, the diffusion time, the atmospheric diffusion parameter related to the effective roughness length of the ground and the atmospheric diffusion parameter related to the leakage time.
The leakage diffusion damage radius determining module is used for obtaining the leakage diffusion damage radius according to the gas leakage diffusion concentration.
The output module is used for outputting the leakage diffusion damage radius
Figure 681777DEST_PATH_IMAGE055
。
Preferably, the following components: the output module is used for outputting the downwind damage influence area
Figure 279112DEST_PATH_IMAGE056
Downwind hazard distance
Figure 300158DEST_PATH_IMAGE057
Cross wind direction hazard distance
Figure 532293DEST_PATH_IMAGE055
And forming time of the hazard zone.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the concentration of the leaked gas and the leakage diffusion damage radius can be obtained according to the meteorological condition, the geographic condition and the diffusion time, so that the problem of difficulty in acquiring field monitoring data is avoided.
Drawings
FIG. 1 is a schematic diagram of warning distances for generating leakage protection on a map.
Detailed Description
The present invention is further illustrated by the following description in conjunction with the accompanying drawings and the specific embodiments, it is to be understood that these examples are given solely for the purpose of illustration and are not intended as a definition of the limits of the invention, since various equivalent modifications will occur to those skilled in the art upon reading the present invention and fall within the limits of the appended claims.
A leakage protection distance measuring method based on positioning monitoring comprises the following steps:
step 1, obtaining a diffusion parameter reference value by adopting a Ternal method according to meteorological conditions and geographic conditions.
And dividing the atmospheric stability by adopting a Terner method and combining factors such as meteorological conditions, geographic conditions and the like. The atmospheric stability refers to the stability of a certain air mass in the atmosphere in the vertical direction, and affects the diffusion of pollutants in the atmosphere, and the more unstable the atmosphere, the faster the diffusion rate of pollutants. The atmospheric stability is closely related to weather phenomena, space-time scales and geographical conditions, and is divided by adopting a Tennel method and combining factors such as meteorological conditions, geographical conditions and the like. The Tenner method applies to the place, time and height of the sunθ h And cloud cover (the whole sky is 10 minutes), determining the solar radiation level, and determining the atmospheric stability level according to the solar radiation level and the average wind speed 10m away from the ground height.
Solar altitude angleθ h Calculated according to the following formula:
Figure 19907DEST_PATH_IMAGE058
in the formula:φ-local geographical latitude.
λ-local geographical longitude.
t-Beijing time at observation.
δSun tilt angle, calculated using the following formula.
Figure 104537DEST_PATH_IMAGE059
In the formula:θ 0 =2πd n /365；
d n date ordinal number in one year, 0,1,2, \8230;, 364.
According to Table 1, from the height of the sunθ h And cloud cover (the whole sky is a tenth system, the total cloud cover and the low cloud cover are determined by local meteorological observation data, and the solar radiation grade is determined by referring to chapter 4.3 of ground meteorological observation Specification of Central weather Bureau of China).
TABLE 1 solar radiation rating (Chinese)
Figure 335799DEST_PATH_IMAGE061
According to Table 2, the atmospheric stability rating is determined from the solar irradiance level and the average wind speed at 10m above the ground (average wind speed at 10min above 10m above ground, using weather station data, see Chapter 9 of the Central weather agency "ground Meteorological Observation Specification").
TABLE 2 atmospheric stability rating
Figure 953599DEST_PATH_IMAGE063
Diffusion parameter σ y 、σ z Is a standard deviation of a normal distribution function, which is a characteristic quantity indicating the diffusion range and the rate size. Considering the technical method for establishing local atmospheric pollutant emission standard (GB/T-3840-91) according to national standardThe effect of the ground conditions on the diffusion was corrected for the atmospheric stability rating determined by the tanner method as follows:
(1) rural and urban suburban areas in plain areas: A. directly checking the table for determining the B-level stability and the C-level stability; D. e and F levels of stability need to be determined by half-level lookup to the unstable direction;
(2) in rural areas or cities in urban areas of industrial areas and hilly mountain areas, A and B grades are not mentioned, C grade is mentioned, D, E and F are mentioned in the unstable direction by one and a half grades, and then the table is looked up for determination; in cities in non-industrial areas, A and B grades are not mentioned, C grade is mentioned from B to C grade, D, E and F are mentioned in unstable directions, and then the urban cities are determined by looking up a table. The details are shown in Table 3.
TABLE 3 different area diffusion parameter stability level correction
Figure 221901DEST_PATH_IMAGE064
The diffusion parameter calculation formula is as follows:
Figure 918461DEST_PATH_IMAGE001
Figure 422255DEST_PATH_IMAGE002
wherein the content of the first and second substances,
Figure 894562DEST_PATH_IMAGE003
represents a reference value of a lateral wind direction dispersion parameter,
Figure 458399DEST_PATH_IMAGE004
、
Figure 783201DEST_PATH_IMAGE005
representing lateral diffusion parameter power function coefficients;
Figure 90686DEST_PATH_IMAGE004
、
Figure 576023DEST_PATH_IMAGE006
representing the coefficients of a power function of a vertical diffusion parameter,
Figure 576340DEST_PATH_IMAGE007
the distance in the down-wind direction is indicated,
Figure 122859DEST_PATH_IMAGE008
indicating a vertical diffusion parameter reference value.
TABLE 4 coefficient value of power function expression of transverse diffusion parameter (sampling time 0.5 h)
Figure 466990DEST_PATH_IMAGE065
TABLE 5 vertical diffusion parameter Power function expression coefficient values (sampling time 0.5 h)
Figure 415355DEST_PATH_IMAGE066
According to the diffusion parameter power function expression coefficient values of tables 4 and 5, according to the downwind distancexDetermining the diffusion coefficient gamma 1 、a 1 、γ 2 、a 2 Determining diffusion parameters based on the established empirical function
Figure 180049DEST_PATH_IMAGE003
、
Figure 948284DEST_PATH_IMAGE008
。
And 2, determining atmospheric diffusion parameters related to the effective roughness length of the ground according to the effective roughness length of the ground and the diffusion parameter reference value.
(1) As the effective roughness length Z of the ground 0 When the grain size is less than or equal to 0.1 m:
Figure 331992DEST_PATH_IMAGE009
Figure 367819DEST_PATH_IMAGE010
wherein the content of the first and second substances,
Figure 303414DEST_PATH_IMAGE011
represents a downwind atmospheric diffusion parameter related to the effective roughness length of the ground,
Figure 558946DEST_PATH_IMAGE012
represents a lateral wind direction diffusion parameter related to the effective roughness length of the ground,
Figure 480766DEST_PATH_IMAGE013
represents a vertical diffusion parameter related to the effective roughness length of the ground,
Figure 403722DEST_PATH_IMAGE003
indicating a reference value of a lateral wind direction dispersion parameter
Figure 884120DEST_PATH_IMAGE008
A reference value of a vertical diffusion parameter is indicated,
Figure 751582DEST_PATH_IMAGE014
representing the ground effective roughness length.
(2) As the effective roughness length Z of the ground 0 When the particle size is more than or equal to 0.1 m:
Figure 477093DEST_PATH_IMAGE015
Figure 988976DEST_PATH_IMAGE016
Figure 141740DEST_PATH_IMAGE017
Figure 230919DEST_PATH_IMAGE018
wherein, the first and the second end of the pipe are connected with each other,
Figure 264515DEST_PATH_IMAGE019
a feature quantity fitting function representing the extent of diffusion and the magnitude of the velocity in the x-direction,
Figure 630905DEST_PATH_IMAGE007
the distance in the downwind direction is indicated,
Figure 954570DEST_PATH_IMAGE014
the effective roughness length of the ground is represented,
Figure 796624DEST_PATH_IMAGE020
、
Figure 863938DEST_PATH_IMAGE021
、
Figure 583370DEST_PATH_IMAGE022
、
Figure 343515DEST_PATH_IMAGE023
、
Figure 548232DEST_PATH_IMAGE024
、
Figure 543869DEST_PATH_IMAGE025
、
Figure 619273DEST_PATH_IMAGE026
which represents the coefficient of stability of the atmosphere,
Figure 48855DEST_PATH_IMAGE027
a feature quantity fitting function representing the extent of diffusion in the y-direction and the magnitude of the velocity,
Figure 6447DEST_PATH_IMAGE028
features indicating extent of diffusion in the z-direction and magnitude of velocityThe characteristic quantity fitting function is used for fitting the characteristic quantity,
Figure 681142DEST_PATH_IMAGE011
represents a downwind atmospheric diffusion parameter related to the effective roughness length of the ground,
Figure 142210DEST_PATH_IMAGE012
represents a lateral wind direction dispersion parameter related to the effective roughness length of the ground,
Figure 8273DEST_PATH_IMAGE013
represents a vertical diffusion parameter related to the effective roughness length of the ground,
Figure 922002DEST_PATH_IMAGE003
represents a reference value of a lateral wind direction dispersion parameter,
Figure 400388DEST_PATH_IMAGE008
a reference value of a vertical diffusion parameter is indicated,
Figure 715963DEST_PATH_IMAGE014
representing the effective roughness length of the ground.
And 3, determining the atmospheric diffusion parameter related to the leakage time according to the leakage time and the diffusion parameter reference value.
Figure 481488DEST_PATH_IMAGE029
Figure 882513DEST_PATH_IMAGE030
Wherein the content of the first and second substances,
Figure 164590DEST_PATH_IMAGE031
indicating a downwind atmospheric diffusion parameter related to the leak time,
Figure 600251DEST_PATH_IMAGE032
presentation versus leakage timeThe off-side wind direction spread parameter,
Figure 542537DEST_PATH_IMAGE033
a vertical diffusion parameter related to the leakage time is indicated,
Figure 696437DEST_PATH_IMAGE034
the time to leak is indicated by the time to leak,
Figure 516626DEST_PATH_IMAGE003
represents a reference value of a lateral wind direction dispersion parameter,
Figure 541214DEST_PATH_IMAGE008
indicating a vertical diffusion parameter reference value.
And 4, establishing a gas leakage diffusion model according to the wind speed, the wind direction, the leakage source, the atmospheric diffusion parameter related to the effective roughness length of the ground and the atmospheric diffusion parameter related to the leakage time.
The gas leakage diffusion model comprises a continuous point source gas leakage diffusion model and an instant gas leakage diffusion model, and the gas leakage diffusion model calculates leakage concentration data of different leakage sources under different conditions (mainly considering wind speed, wind direction, leakage source strength and the like) in a forward direction.
And establishing a continuous point source gas leakage diffusion model according to the wind speed, the wind direction, the leakage source and the atmospheric diffusion parameter related to the effective roughness length of the ground.
Continuous point source gas leakage diffusion model:
Figure 919980DEST_PATH_IMAGE035
Figure 295598DEST_PATH_IMAGE036
in the formula:
Figure 653898DEST_PATH_IMAGE037
representing points of continuityThe source gas leaks out of the diffusion concentration,
Figure 64151DEST_PATH_IMAGE038
the coordinates of the spatial position are represented,xthe distance (m) from the discharge point of the leakage source to any point in the downwind direction is shown;yrepresents the distance (m) from the central axis of the flue gas to any point in the right-angle horizontal direction;zrepresents the height (m) from the surface to any point;
Figure 708759DEST_PATH_IMAGE039
representing the mass flow of material being discharged continuously,
Figure 804628DEST_PATH_IMAGE012
represents a lateral wind direction dispersion parameter related to the leakage time,
Figure 435461DEST_PATH_IMAGE013
a vertical diffusion parameter related to the leakage time is indicated,
Figure 700220DEST_PATH_IMAGE012
、
Figure 781309DEST_PATH_IMAGE013
effective roughness length Z with the ground in continuous leakage 0 In connection with this, the present invention is,
Figure 865939DEST_PATH_IMAGE012
、
Figure 804857DEST_PATH_IMAGE013
when calculating, the atmospheric diffusion coefficient (calculated according to Z0 ≦ 0.1
Figure 658544DEST_PATH_IMAGE012
、
Figure 910534DEST_PATH_IMAGE013
) Reuse of the effective roughness Z of the ground 0 Whether it is greater than 0.1 or not,
Figure 482461DEST_PATH_IMAGE040
representing the ambient mean wind speed (m/s),
Figure 720675DEST_PATH_IMAGE041
indicating the effective height of the source of the leak.
Calculate concentration at z = Hr:
Figure 927403DEST_PATH_IMAGE067
Figure 350294DEST_PATH_IMAGE068
in the formula:
Figure 409517DEST_PATH_IMAGE069
indicating the leakage source lift height (m) (out of the "significant hazard classification criteria. Doc"),
Figure 185843DEST_PATH_IMAGE070
representing the gas cloud exit velocity (m/s),
Figure 14122DEST_PATH_IMAGE071
the diameter (m) of the outlet is shown,
Figure 607914DEST_PATH_IMAGE072
representing the ambient wind speed (m/s),
Figure 387389DEST_PATH_IMAGE073
represents the effective height (m) of the leakage source,
Figure 232985DEST_PATH_IMAGE074
indicating the leakage source height (m).
The calculation process for determining y in the formula is as follows:
a) Step size selection (solving the iterative performance problem, setting target concentration n) d (mg/m 3 ) Selecting a step size according to the target concentration,
when n is d <=0.01, the step size may be 1000;
when n is d <If =0.1, the step size may be 700;
when n is d <If =1, the step size may be 300; when n is d <=50, the step size may be taken as 100;
when n is d <=100, then the step size may be 00; when n is d <=300, the step size may be 1;
b) The downwind distance x =0 is iteratively increased in steps, and for a fixed x, the above equation may be used
Figure 915771DEST_PATH_IMAGE037
The reverse-push formula of (1) calculates the y value corresponding to X (i.e. corresponding to the cross wind direction distance, at which the substituted concentration is the poisoning concentration of the critical value), records the maximum cross wind direction distance under X which has been traversed at present by using one value, and records the X corresponding to the critical value at which a certain position y begins to become smaller as X increases as X is X mid In this case, y is the farthest distance affected by the transverse wind direction. The corresponding cross-wind distance is then calculated as x increases until y =0, calculated at the corresponding x, when x is the downwind poisoning hazard farthest distance. Calculating the area of poisoning hazard in downwind direction: dividing the hazard region into n regions according to step length, calculating the area of each region, and superposing, wherein when the step length is greater than 1, calculating the area of the current small region, the step length should be specifically calculated in a thinning manner to obtain
Figure 821410DEST_PATH_IMAGE037
The formula of (c) is as follows:
Figure 353760DEST_PATH_IMAGE075
and (3) introducing time factors for analysis, and being suitable for instantaneous gas leakage diffusion, namely establishing an instantaneous gas leakage diffusion model according to wind speed, wind direction, leakage sources and atmospheric diffusion parameters related to leakage time.
Instantaneous gas leakage diffusion model:
Figure 737468DEST_PATH_IMAGE042
Figure 71497DEST_PATH_IMAGE043
wherein, the first and the second end of the pipe are connected with each other,
Figure 882459DEST_PATH_IMAGE044
indicating the instantaneous gas leak diffusion concentration,
Figure 185262DEST_PATH_IMAGE045
which is indicative of the mass of material being discharged instantaneously,
Figure 107082DEST_PATH_IMAGE046
which is indicative of the time of day,
Figure 30039DEST_PATH_IMAGE038
the coordinates of the spatial position are represented,xthe distance (m) from the discharge point of the leakage source to any point in the downwind direction is shown;yrepresents the distance (m) from the central axis of the flue gas to any point in the right-angle horizontal direction;zrepresenting the height (m) from the surface to any point,
Figure 136535DEST_PATH_IMAGE039
representing the mass flow of material being discharged continuously,
Figure 784423DEST_PATH_IMAGE031
indicating a downwind atmospheric diffusion parameter related to the leak time,
Figure 775512DEST_PATH_IMAGE032
represents a lateral wind direction dispersion parameter related to the leakage time,
Figure 84134DEST_PATH_IMAGE033
a vertical diffusion parameter related to the leakage time is indicated,
Figure 502477DEST_PATH_IMAGE040
which represents the average wind speed of the environment,
Figure 231136DEST_PATH_IMAGE041
indicating the effective height of the source of the leak.
Length Z of effective roughness of ground surface during instantaneous leakage of atmospheric diffusion parameter 0 Independently, the calculated atmospheric diffusion parameter (calculated as Z0 ≦ 0.1) is reused for the leakage time T l It is corrected as shown in step 3.
Calculating out
Figure 760338DEST_PATH_IMAGE076
When is not in use, and
Figure 392307DEST_PATH_IMAGE077
the concentration of (A):
Figure 981552DEST_PATH_IMAGE078
Figure 197507DEST_PATH_IMAGE079
the calculation process for determining the farthest distance of influence L of downwind is as follows:
from the above, the atmospheric diffusion parameter is related to x (x = ut), and the iteratively calculated concentration using time is compared with the target concentration until the calculated concentration<The time obtained by the target concentration (kg/m 3) is the farthest downwind poisoning influence forming time(s), and then the farthest downwind influence distance (m) L is calculated max =T max * u; where u represents the ambient mean wind speed (m/s).
And 5, determining the leakage diffusion damage radius according to the gas leakage diffusion model.
The method for determining the leak diffusion hazard radius according to the gas leak diffusion model is as follows:
downwind distance:
Figure 530400DEST_PATH_IMAGE047
wherein the content of the first and second substances,
Figure 875930DEST_PATH_IMAGE007
the distance in the down-wind direction is indicated,
Figure 636076DEST_PATH_IMAGE040
which represents the average wind speed of the environment,
Figure 575213DEST_PATH_IMAGE048
indicating the diffusion time.
Distance from downwind
Figure 685032DEST_PATH_IMAGE007
Substituting the model into the gas leakage diffusion model, and making y =0, the gas leakage diffusion concentration C is obtained.
Leak diffusion hazard radius squared:
Figure 150649DEST_PATH_IMAGE049
wherein, the first and the second end of the pipe are connected with each other,
Figure 81696DEST_PATH_IMAGE050
represents the leakage spread hazard radius squared (m) 2 ），
Figure 242550DEST_PATH_IMAGE051
Is the diffusion coefficient in the y-direction,
Figure 917245DEST_PATH_IMAGE052
the concentration of the hazardous substances is shown,
Figure 876848DEST_PATH_IMAGE053
indicating the gas leak diffusion concentration.
Leak diffusion hazard radius:
Figure 837851DEST_PATH_IMAGE054
wherein the content of the first and second substances,
Figure 751580DEST_PATH_IMAGE055
indicating the leak diffusion hazard radius.
When R >0, the output result is:
1. diffusion T k After second, the hazard radius at X meters downwind is r meters.
2. Diffusion T k After second, the area of downwind hazard impact is
Figure 229966DEST_PATH_IMAGE056
Square meter.
3. Diffusion hazard conditions (shown at the simulation interface).
3.1 Downwind hazard distance (meters):
Figure 279962DEST_PATH_IMAGE080
。
3.2 Cross wind hazard distance (meters):
Figure 316926DEST_PATH_IMAGE055
。
3.3 hazard area (square meter):
Figure 717951DEST_PATH_IMAGE056
。
3.4 Hazard zone formation time (seconds): t is k 。
When R < =0, then the resulting parameters are all 0.
The utility model provides a leakage protection distance survey system based on positioning monitoring, includes input module, diffusion parameter benchmark confirm module, atmospheric diffusion parameter confirm module relevant with the effective roughness length in ground, atmospheric diffusion parameter confirm module relevant with the leakage time, gas leakage diffusion model module, leakage diffusion harm radius confirm module, output module, wherein:
the input module is used for inputting meteorological conditions, geographic conditions and diffusion time.
The diffusion parameter reference value determining module is used for obtaining a diffusion parameter reference value by adopting a Ternal method according to meteorological conditions and geographic conditions.
The atmospheric diffusion parameter determining module related to the ground effective roughness length is used for determining atmospheric diffusion parameters related to the ground effective roughness length according to the ground effective roughness length and a diffusion parameter reference value.
And the atmospheric diffusion parameter determining module related to the leakage time is used for determining the atmospheric diffusion parameter related to the leakage time according to the leakage time and the diffusion parameter reference value.
The gas leakage diffusion model module is used for obtaining gas leakage diffusion concentration by utilizing a gas leakage diffusion model according to input meteorological conditions, diffusion time, atmospheric diffusion parameters related to the effective roughness length of the ground and atmospheric diffusion parameters related to the leakage time.
The leakage diffusion hazard radius determination module is used for obtaining a leakage diffusion hazard radius according to the gas leakage diffusion concentration.
The output module is used for outputting the leakage diffusion damage radius
Figure 734449DEST_PATH_IMAGE055
Area affected by downwind damage
Figure 170109DEST_PATH_IMAGE056
Downwind hazard distance
Figure 472915DEST_PATH_IMAGE057
Cross wind direction hazard distance
Figure 125351DEST_PATH_IMAGE081
And forming time of the hazard zone.
Selecting a dangerous chemical leakage scene, combining the monitoring results of the fixed sensor and the mobile control monitoring results, comparing a group of monitoring values with the concentration value calculated by the model, and when the standard deviation of the concentration is metLess than 10 -5 The position of a leakage source (release source) is located by back calculation, the relevant hazard distance calculated by the model is combined, and the ERG definition data is combined to generate a warning distance graph of leakage protection on a map, as shown in figure 1, so that the measurement of the leakage protection distance and the division of a warning isolation area are realized.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (8)

1. A leakage protection distance measuring method based on positioning monitoring is characterized by comprising the following steps:
step 1, obtaining a diffusion parameter reference value by adopting a Ternal method according to meteorological conditions and geographic conditions;
step 2, determining atmospheric diffusion parameters related to the effective roughness length of the ground according to the effective roughness length of the ground and the reference value of the diffusion parameters;
step 3, determining atmospheric diffusion parameters related to the leakage time according to the leakage time and the diffusion parameter reference value;
step 4, establishing a gas leakage diffusion model according to the wind speed, the wind direction, the leakage source, the atmospheric diffusion parameter related to the effective roughness length of the ground and the atmospheric diffusion parameter related to the leakage time;
and 5, determining the leakage diffusion damage radius according to the gas leakage diffusion model.
2. The method for determining the leakage protection distance based on the positioning monitoring as claimed in claim 1, wherein: in the step 1, a method for obtaining a diffusion parameter reference value by adopting a Ternal method according to meteorological conditions and geographic conditions comprises the following steps:
Figure 623685DEST_PATH_IMAGE001
Figure 428699DEST_PATH_IMAGE002
wherein, the first and the second end of the pipe are connected with each other,
Figure 308931DEST_PATH_IMAGE003
represents a reference value of a lateral wind direction dispersion parameter,
Figure 950127DEST_PATH_IMAGE004
、
Figure 91783DEST_PATH_IMAGE005
representing lateral diffusion parameter power function coefficients;
Figure 502036DEST_PATH_IMAGE004
、
Figure 818748DEST_PATH_IMAGE006
representing the coefficients of a power function of a vertical diffusion parameter,
Figure 196508DEST_PATH_IMAGE007
the distance in the down-wind direction is indicated,
Figure 624079DEST_PATH_IMAGE008
indicating a vertical diffusion parameter reference value.
3. The method for determining the distance to prevent leakage based on location monitoring as claimed in claim 2, wherein: in step 2, determining an atmospheric diffusion parameter related to the effective roughness length of the ground according to the effective roughness length of the ground and a diffusion parameter reference value:
(1) As the effective roughness length Z of the ground 0 When the grain size is less than or equal to 0.1 m:
Figure 403685DEST_PATH_IMAGE009
Figure 891298DEST_PATH_IMAGE010
wherein the content of the first and second substances,
Figure 241508DEST_PATH_IMAGE011
represents a downwind atmospheric diffusion parameter related to the effective roughness length of the ground,
Figure 987616DEST_PATH_IMAGE012
represents a lateral wind direction diffusion parameter related to the effective roughness length of the ground,
Figure 372461DEST_PATH_IMAGE013
represents a vertical diffusion parameter related to the effective roughness length of the ground,
Figure 30975DEST_PATH_IMAGE003
indicating a reference value of a lateral wind direction dispersion parameter
Figure 397976DEST_PATH_IMAGE008
Represents a reference value of a vertical diffusion parameter,
Figure 901770DEST_PATH_IMAGE014
representing the effective roughness length of the ground;
(2) As the effective roughness length Z of the ground 0 When the particle size is more than or equal to 0.1 m:
Figure 406701DEST_PATH_IMAGE015
Figure 219805DEST_PATH_IMAGE016
Figure 544607DEST_PATH_IMAGE017
Figure 632518DEST_PATH_IMAGE018
wherein the content of the first and second substances,
Figure 991955DEST_PATH_IMAGE019
a feature fit function representing the extent of diffusion and the magnitude of the velocity in the x-direction,
Figure 992272DEST_PATH_IMAGE007
the distance in the downwind direction is indicated,
Figure 53638DEST_PATH_IMAGE014
the effective roughness length of the ground is represented,
Figure 164813DEST_PATH_IMAGE020
、
Figure 378757DEST_PATH_IMAGE021
、
Figure 802172DEST_PATH_IMAGE022
、
Figure 101567DEST_PATH_IMAGE023
、
Figure 265701DEST_PATH_IMAGE024
、
Figure 599730DEST_PATH_IMAGE025
、
Figure 941850DEST_PATH_IMAGE026
which represents the coefficient of atmospheric stability of the air,
Figure 712228DEST_PATH_IMAGE027
a feature fit function representing the extent of diffusion in the y-direction and the magnitude of the velocity,
Figure 430786DEST_PATH_IMAGE028
a feature quantity fitting function representing the extent of diffusion and the magnitude of velocity in the z direction,
Figure 619322DEST_PATH_IMAGE011
represents a downwind atmospheric diffusion parameter related to the effective roughness length of the ground,
Figure 647189DEST_PATH_IMAGE012
represents a lateral wind direction dispersion parameter related to the effective roughness length of the ground,
Figure 655597DEST_PATH_IMAGE013
represents a vertical diffusion parameter related to the effective roughness length of the ground,
Figure 912266DEST_PATH_IMAGE003
represents a reference value of a lateral wind direction dispersion parameter,
Figure 207505DEST_PATH_IMAGE008
a reference value of a vertical diffusion parameter is indicated,
Figure 891427DEST_PATH_IMAGE014
representing the effective roughness length of the ground.
4. The method for determining the leakage protection distance based on the positioning monitoring as claimed in claim 3, wherein: and 3, determining an atmospheric diffusion parameter related to the leakage time according to the leakage time and the diffusion parameter reference value:
Figure 901978DEST_PATH_IMAGE029
Figure 696758DEST_PATH_IMAGE030
wherein, the first and the second end of the pipe are connected with each other,
Figure 859886DEST_PATH_IMAGE031
indicating a downwind atmospheric diffusion parameter associated with the leak time,
Figure 963977DEST_PATH_IMAGE032
represents a lateral wind direction dispersion parameter related to the leakage time,
Figure 946977DEST_PATH_IMAGE033
a vertical diffusion parameter related to the leakage time is indicated,
Figure 545449DEST_PATH_IMAGE034
the time of the leak is indicated,
Figure 812351DEST_PATH_IMAGE003
represents a reference value of a lateral wind direction dispersion parameter,
Figure 838076DEST_PATH_IMAGE008
indicating a vertical diffusion parameter reference value.
5. The method for determining the leakage protection distance based on the positioning monitoring as claimed in claim 4, wherein: the gas leakage diffusion model in the step 4 comprises a continuous point source gas leakage diffusion model and an instant gas leakage diffusion model;
continuous point source gas leakage diffusion model:
Figure 560568DEST_PATH_IMAGE035
Figure 962731DEST_PATH_IMAGE036
in the formula:
Figure 834872DEST_PATH_IMAGE037
representing a continuous point source gas leak diffusion concentration,
Figure 280766DEST_PATH_IMAGE038
the coordinates of the spatial position are represented,xindicating the distance from the leakage source discharge point to any point up the downwind,yindicating the distance of the central axis of the flue gas to any point in the right-angle horizontal direction,zindicating the height from the surface of the earth to any point,
Figure 238357DEST_PATH_IMAGE039
representing the mass flow of material being discharged continuously,
Figure 444211DEST_PATH_IMAGE012
represents a lateral wind direction dispersion parameter related to the leakage time,
Figure 420126DEST_PATH_IMAGE013
a vertical diffusion parameter related to the leakage time is indicated,
Figure 787653DEST_PATH_IMAGE040
which is indicative of the average wind speed of the environment,
Figure 481809DEST_PATH_IMAGE041
represents the effective height of the leakage source;
instantaneous gas leakage diffusion model:
Figure 225774DEST_PATH_IMAGE042
Figure 806928DEST_PATH_IMAGE043
wherein the content of the first and second substances,
Figure 851414DEST_PATH_IMAGE044
indicating the instantaneous gas leak diffusion concentration,
Figure 518019DEST_PATH_IMAGE045
which is indicative of the mass of material being discharged instantaneously,
Figure 65675DEST_PATH_IMAGE046
which is indicative of the time of day,
Figure 750603DEST_PATH_IMAGE038
the coordinates of the spatial position are represented,xindicating the distance from the leakage source discharge point to any point up the downwind,yindicating the distance of the central axis of the flue gas to any point in the right-angle horizontal direction,zindicating the height from the surface of the earth to any point,
Figure 725512DEST_PATH_IMAGE031
indicating a downwind atmospheric diffusion parameter related to the leak time,
Figure 128681DEST_PATH_IMAGE032
represents a lateral wind direction dispersion parameter related to the leakage time,
Figure 214448DEST_PATH_IMAGE033
a vertical diffusion parameter related to the leakage time is indicated,
Figure 770195DEST_PATH_IMAGE040
which represents the average wind speed of the environment,
Figure 430852DEST_PATH_IMAGE041
indicating the effective height of the source of the leak.
6. The method for determining the distance between a leak protection device and a base station based on positioning monitoring according to claim 5, wherein: the method for determining the leakage diffusion hazard radius according to the gas leakage diffusion model in the step 5 comprises the following steps:
downwind distance:
Figure 72049DEST_PATH_IMAGE047
wherein, the first and the second end of the pipe are connected with each other,
Figure 961508DEST_PATH_IMAGE007
the distance in the down-wind direction is indicated,
Figure 623958DEST_PATH_IMAGE040
which represents the average wind speed of the environment,
Figure 940669DEST_PATH_IMAGE048
represents the diffusion time;
distance from downwind
Figure 69162DEST_PATH_IMAGE007
Substituting the model into a gas leakage diffusion model, and enabling y =0 to obtain a gas leakage diffusion concentration C;
leakage spread hazard radius squared:
Figure 746000DEST_PATH_IMAGE049
wherein, the first and the second end of the pipe are connected with each other,
Figure 276339DEST_PATH_IMAGE050
indicating the leak spread compromise radius squared,
Figure 747640DEST_PATH_IMAGE051
is a y directionThe upward diffusion coefficient of the light is,
Figure 363429DEST_PATH_IMAGE052
the concentration of the hazardous substances is shown,
Figure 594691DEST_PATH_IMAGE053
indicating a gas leak diffusion concentration;
leak diffusion hazard radius:
Figure 494382DEST_PATH_IMAGE054
wherein the content of the first and second substances,
Figure 887318DEST_PATH_IMAGE055
indicating the leak diffusion hazard radius.
7. A leakage protection distance measuring system based on the leakage protection distance measuring method based on positioning monitoring of claim 1, characterized in that: the device comprises an input module, a diffusion parameter reference value determining module, an atmospheric diffusion parameter determining module related to the effective roughness length of the ground, an atmospheric diffusion parameter determining module related to the leakage time, a gas leakage diffusion model module, a leakage diffusion hazard radius determining module and an output module, wherein:
the input module is used for inputting meteorological conditions, geographic conditions and diffusion time;
the diffusion parameter reference value determining module is used for obtaining a diffusion parameter reference value by adopting a Ternal method according to meteorological conditions and geographic conditions;
the atmospheric diffusion parameter determining module related to the ground effective roughness length is used for determining atmospheric diffusion parameters related to the ground effective roughness length according to the ground effective roughness length and a diffusion parameter reference value;
the atmospheric diffusion parameter determining module related to the leakage time is used for determining atmospheric diffusion parameters related to the leakage time according to the leakage time and the diffusion parameter reference value;
the gas leakage diffusion model module is used for obtaining gas leakage diffusion concentration by utilizing a gas leakage diffusion model according to input meteorological conditions, diffusion time, atmospheric diffusion parameters related to the effective roughness length of the ground and atmospheric diffusion parameters related to the leakage time;
the leakage diffusion damage radius determining module is used for obtaining a leakage diffusion damage radius according to the gas leakage diffusion concentration;
the output module is used for outputting the leakage diffusion damage radius
Figure 724824DEST_PATH_IMAGE055
。
8. The leakage prevention distance measuring system according to claim 7, wherein: the output module is used for outputting the downwind damage influence area
Figure 746394DEST_PATH_IMAGE056
Downwind hazard distance
Figure 251324DEST_PATH_IMAGE057
Cross wind direction hazard distance
Figure 346319DEST_PATH_IMAGE055
And forming time of the hazard zone.
CN202211331979.1A 2022-10-28 2022-10-28 Leakage protection distance measuring system and method based on positioning monitoring Pending CN115638938A (en)

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