CN116698673A - Dangerous gas leakage three-dimensional diffusion dynamic simulation method based on environmental information - Google Patents
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Abstract
The invention discloses a dangerous gas leakage three-dimensional diffusion dynamic simulation method based on environmental information. Firstly, the leakage rates of different gas flowing states are represented by the mass flow rate of dangerous gas leakage, and then, a three-dimensional dangerous gas leakage diffusion model based on environmental information is constructed to simulate the dangerous gas diffusion state. And finally, realizing three-dimensional simulation of gas diffusion based on simulation software so as to obtain the three-dimensional diffusion trend of the dangerous gas with higher accuracy. The method can consider the evolution process of gas diffusion under the influence of environmental factors, rapidly predicts the atmospheric concentration distribution after the dangerous gas leaks, and has guiding significance for actual risk assessment and emergency rescue.
Description
Technical Field
The invention relates to a diffusion simulation technology in petrochemical industry, in particular to a three-dimensional diffusion dynamic simulation method for dangerous gas leakage based on environmental information.
Background
Dangerous gas leakage accidents can cause serious threats to human lives, properties and environments, so that accurate prediction and simulation of the diffusion process of dangerous gases are of great significance for scientific guidance of emergency rescue and protection of public safety. However, current hazardous gas leakage prediction and simulation techniques suffer from several drawbacks, including but not limited to the following:
1. inaccurate real-time data acquisition: when dangerous gas leakage accidents happen, real-time data of a diffusion site cannot be accurately obtained, so that the actual situation of the accidents is not mastered enough, and the accuracy and timeliness of corresponding emergency rescue actions are affected.
2. Diffusion range prediction is inaccurate: in the prior art, certain errors exist when the diffusion range of dangerous gas is predicted, the matching degree of a predicted result and the actual diffusion condition is low, and the range and the degree of a disaster-affected area are difficult to accurately evaluate.
3. The diffusion model simplifies two-dimension: in the prior art, a diffusion model of dangerous gas is generally simplified into a two-dimensional model, and diffusion change in the vertical direction is ignored, so that accuracy of a simulation result is limited.
4. Lack of environmental considerations: in the prior art, the influence of environmental factors on gas diffusion evolution, such as topography, meteorological conditions and the like, is not fully considered in the dangerous gas diffusion simulation process, so that the accuracy and reliability of a simulation result are required to be improved.
Disclosure of Invention
The invention aims to provide a dangerous gas leakage three-dimensional diffusion dynamic simulation method based on environmental information.
In order to achieve the above purpose, the invention is implemented according to the following technical scheme:
the invention comprises the following steps:
s1: collecting leakage source parameters and environment parameters;
s2: acquiring a three-dimensional map scene;
s3: constructing a dangerous gas leakage three-dimensional diffusion model based on environmental information;
s4: acquiring a three-dimensional diffusion image of the leakage gas at the current moment;
s5: refreshing a three-dimensional diffusion image of the leakage gas at the next moment according to the updating frequency;
s6: the three-dimensional diffusion process of dangerous gas leakage is obtained: if the current time reaches the final sampling time, finishing simulation to obtain a dynamic diffusion process of dangerous gas leakage; otherwise, go to step S4.
The beneficial effects of the invention are as follows:
the invention relates to a dangerous gas leakage three-dimensional diffusion dynamic simulation method based on environmental information, which has the following technical effects compared with the prior art:
accurate acquisition of real-time data: by adopting an advanced data acquisition technology, the data information of the dangerous gas leakage site can be accurately acquired in real time, and accurate and comprehensive data support is provided.
And (3) predicting the precise diffusion range: the invention constructs a three-dimensional diffusion model of dangerous gas leakage based on environmental information, and considers the influence of environmental factors on gas diffusion, such as topography, meteorological conditions and the like. According to the model, the diffusion range of dangerous gas can be predicted more accurately, the matching degree of a prediction result and the actual diffusion condition is improved, and the range and the degree of a disaster-affected area can be estimated accurately.
The three-dimensional simulation improves accuracy: compared with the simplified two-dimensional model in the prior art, the invention adopts a three-dimensional simulation method and considers the diffusion change in the vertical direction. Therefore, the diffusion trend of dangerous gas can be more accurately simulated, and the accuracy and reliability of the simulation result are improved.
And (3) rapidly predicting the atmospheric concentration distribution: the method can rapidly predict the concentration distribution condition in the atmosphere after the dangerous gas leaks. By accurately simulating the space-time evolution process of dangerous gas, the atmospheric concentration distribution prediction with higher accuracy can be provided, and scientific guidance is provided for actual risk assessment and emergency rescue actions.
In summary, the dangerous gas leakage three-dimensional diffusion simulation method based on the environmental information provided by the invention can overcome the defects of the prior art, and realize the technical effects of accurate acquisition of real-time data, prediction of accurate diffusion range, improvement of three-dimensional simulation accuracy, rapid prediction of atmospheric concentration distribution and the like. The device plays an important role in guiding and supporting the prevention of dangerous gas leakage accidents and emergency rescue work, and is beneficial to improving the public safety level and the capability of coping with emergencies.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a three-dimensional diffusion dynamic diagram of gas leakage.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the invention are for purposes of illustration, but are not intended to be limiting.
As shown in fig. 1: the invention comprises the following steps:
s1: data is collected. Including leakage source parameters themselves and environmental parameters. Wherein the leakage self-deriving parameters include gas leakage type, leakage hole shape, etc.; environmental parameters include leak longitude, latitude, temperature, humidity and altitude, wind speed, wind direction, barometric pressure, etc.
The leak source self-source parameters may be obtained by visual inspection or laser rangefinder.
Environmental parameters may be obtained and calculated by the portable weather station.
S2: acquiring a three-dimensional map scene;
s3: and constructing a dangerous gas leakage three-dimensional diffusion model based on the environmental information.
S31: environmental information parameters are determined. According to the portable weather station, the information such as wind speed, wind direction, air pressure and the like can be determined, and then the atmospheric stability level is obtained.
S32: and calculating a gas leakage mass flow rate unit.
When the dangerous gas leaks, the leakage flow rate is related to the gas flowing state. It is therefore first necessary to construct a flow rate unit to judge the gas flow state. The built hazardous gas leakage mass flow rate unit is as follows:
wherein Q represents a gas leakage mass flow rate; y represents a gas expansion factor; c (C) d The gas leakage coefficient is expressed, and the gas leakage coefficient is related to the shape of a leakage hole, wherein the shape of the leakage hole is 1.00 when the shape of the leakage hole is round, 0.95 when the shape of the leakage hole is triangular, and 0.90 when the shape of the leakage hole is rectangular; a represents the leakage hole area; p represents the pressure of the medium in the container; m represents the relative molecular mass of the leaked gas; gamma represents an adiabatic index; r is R g Representing the gas constant; t represents the temperature of the gas in the container; p (P) 0 Representing ambient pressure; p represents the pressure of the medium in the container; when (when)When the device is established, the gas flowing state belongs to sonic flow; when->When established, the gas flow state is subsonic flow.
Step S33: and constructing a dangerous gas leakage three-dimensional diffusion model based on the environmental information.
At present, the research on leakage gas diffusion ignores the influence of meteorological conditions, particularly the influence of atmospheric humidity change on gas diffusion, so that the predicted result and the actual result obtained by the original Gaussian model have larger access. Through further perfecting the Gaussian plume model, a dangerous gas leakage three-position diffusion model adapting to the change of a plurality of degrees of conditions is established, and the dangerous gas diffusion state is simulated.
The mathematical model converted by gaussian diffusion mode is:
wherein C represents the dangerous gas concentration at point (x, y, z); t represents the moment; u (u) x ,u y ,u z Respectively representing the components of wind speed in x, y and z directions; sigma (sigma) x ,σ y ,σ z Diffusion coefficients respectively representing downwind direction, sidewind direction and vertical wind direction; sigma (sigma) ax ,σ ay ,σ az The molecular diffusion coefficients in the humid air in the x, y, z directions are shown, respectively; sigma (sigma) mx ,σ my ,σ mz Representing the molecular diffusion coefficients in dry air in the x, y, z directions, respectively; further sigma ax -σ mx ,σ ay -σ my ,σ az -σ mz The change in the influence of humidity on the molecular diffusion coefficient in the x, y, and z directions can be expressed, respectively.
Assuming that the atmosphere is in a stationary state, it assumes a stable, uniform state that does not change over time, i.eThe flow of the leakage gas during diffusion is stable and has a dominant direction, i.e. u=u x ,u y ＝0,u z =0. The influence of the dominant wind gas movement is much greater than the influence of the gas turbulence movement on the diffusion, i.e.> The diffusion process of the leakage gas moving in the atmospheric wind flow can be expressed as:
known boundary conditions are: when ζ, ucdydz=q, the solution of equation (3) can be obtained:
step S4: acquiring a three-dimensional diffusion dynamic image of the leakage gas at the current moment, as shown in fig. 2;
in order to intuitively show the hazard of leaked gas, four dangerous areas of an immediate dead zone, a severe zone, a moderate zone and a mild zone are divided according to the severity from high to low according to gas concentration information. Wherein the immediate dead zone corresponds to dark red, the heavy zone corresponds to light red, the medium zone corresponds to yellow, and the light zone corresponds to blue.
And calculating the concentration value of each pixel point of the leakage related area by substituting the dangerous gas leakage three-dimensional diffusion model formula, and giving out the color RGB value corresponding to the concentration of the pixel point. And obtaining a three-dimensional diffusion image of the leakage gas at the current moment by calculating concentration values of all pixel points of the leakage related area at the moment.
Step S5: and refreshing the three-dimensional diffusion image of the dew gas at the next moment according to the updating frequency.
Step S6: and obtaining a three-dimensional diffusion process of dangerous gas leakage. And if the current moment reaches the final sampling moment, finishing simulation to obtain a dynamic diffusion process of dangerous gas leakage. Otherwise, go to step S4.
According to the invention, firstly, the leakage rates of different gas flowing states are represented by the leakage mass flow rate of the dangerous gas, and then, a three-dimensional dangerous gas leakage diffusion model based on environmental information is constructed so as to simulate the dangerous gas diffusion state. And finally, realizing three-dimensional simulation of gas diffusion based on simulation software so as to obtain the three-dimensional diffusion trend of the dangerous gas with higher accuracy. The method can consider the evolution process of gas diffusion under the influence of environmental factors, rapidly predicts the atmospheric concentration distribution after dangerous gas leakage, and has guiding significance for actual risk assessment and emergency rescue.
The technical scheme of the invention is not limited to the specific embodiment, and all technical modifications made according to the technical scheme of the invention fall within the protection scope of the invention.
Claims (3)
1. The three-dimensional diffusion dynamic simulation method for dangerous gas leakage based on environmental information is characterized by comprising the following steps of:
s1: collecting leakage source parameters and environment parameters;
s2: acquiring a three-dimensional map scene;
s3: constructing a dangerous gas leakage three-dimensional diffusion model based on environmental information;
s4: acquiring a three-dimensional diffusion image of the leakage gas at the current moment;
s5: refreshing a three-dimensional diffusion image of the leakage gas at the next moment according to the updating frequency;
s6: the three-dimensional diffusion process of dangerous gas leakage is obtained: if the current time reaches the final sampling time, finishing simulation to obtain a dynamic diffusion process of dangerous gas leakage; otherwise, go to step S4.
2. The environmental information-based three-dimensional diffusion dynamic simulation method for dangerous gas leakage according to claim 1, wherein the method comprises the following steps of: the leakage self-generating parameters in the step S1 comprise gas leakage type and leakage hole shape; environmental parameters include leak longitude, latitude, temperature, humidity, altitude, wind speed, wind direction, and barometric pressure.
3. The environmental information-based three-dimensional diffusion dynamic simulation method for dangerous gas leakage according to claim 1, wherein the method comprises the following steps of: the step S3 specifically comprises the following steps:
s31: determining environmental information parameters: determining wind speed, wind direction and air pressure according to the collected environmental parameters, and further obtaining the atmospheric stability level;
s32: the built hazardous gas leakage mass flow rate unit is as follows:
wherein Q represents a gas leakage mass flow rate; y represents a gas expansion factor; c (C) d The gas leakage coefficient is expressed, and the gas leakage coefficient is related to the shape of a leakage hole, wherein the shape of the leakage hole is 1.00 when the shape of the leakage hole is round, 0.95 when the shape of the leakage hole is triangular, and 0.90 when the shape of the leakage hole is rectangular; a represents the leakage hole area; p represents the pressure of the medium in the container; m represents the relative molecular mass of the leaked gas; gamma represents an adiabatic index; r is R g Representing the gas constant; t represents the temperature of the gas in the container; p (P) 0 Representing ambient pressure; p represents the pressure of the medium in the container; when (when)When the device is established, the gas flowing state belongs to sonic flow; when->When the device is established, the gas flowing state belongs to subsonic flow;
s33: based on the Gaussian plume model, a dangerous gas leakage three-position diffusion model adapting to the change of a number degree condition is established, the dangerous gas diffusion state is simulated,
the mathematical model converted by gaussian diffusion mode is:
wherein C represents the dangerous gas concentration at point (x, y, z); t represents the moment; u (u) x ,u y ,u z Respectively representing the components of wind speed in x, y and z directions; sigma (sigma) x ,σ y ,σ z Diffusion coefficients respectively representing downwind direction, sidewind direction and vertical wind direction; sigma (sigma) ax ,σ ay ,σ az The molecular diffusion coefficients in the humid air in the x, y, z directions are shown, respectively; v mx ,σ my ,σ mz Respectively, in the x, y, z directionsCoefficients; further sigma ax -σ mx ,σ ay -σ my ,σ az -σ mz The influence variation of the humidity in the x, y and z directions on the molecular diffusion coefficient can be respectively represented;
the diffusion process of the movement of the leakage gas in the atmospheric wind flow is expressed as:
known boundary conditions are: when ζ, ucdydz=q, the solution of equation (3) can be obtained:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117316323A (en) * | 2023-09-20 | 2023-12-29 | 南京信息工程大学 | Subway station internal biochemical gas diffusion numerical simulation method and emergency plan generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117316323A (en) * | 2023-09-20 | 2023-12-29 | 南京信息工程大学 | Subway station internal biochemical gas diffusion numerical simulation method and emergency plan generation system |
| CN117316323B (en) * | 2023-09-20 | 2024-05-31 | 南京信息工程大学 | Subway station internal biochemical gas diffusion numerical simulation method and emergency plan generation system |
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