CN115081359B - Hazardous chemicals conflagration heat radiation damage analytic system - Google Patents
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Abstract
The invention provides a dangerous chemical fire thermal radiation damage analysis system, which relates to the technical field of fire radiation analysis, and comprises a database module, a basic analysis module, a real-time acquisition module and a radiation analysis module; the database module comprises a dangerous chemical data storage unit and a storage device data storage unit; the fire hazard chemical simulation system comprises a dangerous chemical data storage unit, a storage device data storage unit and a simulation parameter simulation unit, wherein the dangerous chemical data storage unit stores material physical and chemical parameters of dangerous chemicals, and the storage device data storage unit stores specification parameters of a storage device of the dangerous chemicals.
Description
Technical Field
The invention relates to the technical field of fire radiation analysis, in particular to a system for analyzing thermal radiation damage of a dangerous chemical fire.
Background
The dangerous chemicals refer to highly toxic chemicals and other chemicals which have the properties of toxicity, corrosion, explosion, combustion-supporting and the like and are harmful to human bodies, facilities and the environment. In the processes of production, loading and unloading, storage and transportation, dangerous chemicals are stored in a storage tank or a container, and run in a production device, equipment and a pipeline, and the possibility of leakage is low under normal conditions. Because of uncertain factors existing in the construction and operation process of equipment, machines, pumps and the like used in construction projects and pipelines, flanges, valves or welding connections, the possibility of chemical leakage exists, the risk of fire disasters can be greatly increased in the leakage process, and dangerous chemicals have serious radiation influence on nearby target objects when the fire disasters occur.
In the prior art, the construction of a common fire scene is realized by CFD numerical simulation software at present, but the numerical simulation usually needs complicated example modeling, the simulation time is long, and the modeling process needs to be carried out again once an error occurs, so that the method is not suitable for the engineering practice process; there is therefore a need for a simplified fire thermal radiation consequence simulation method that can be used in engineering application scenarios.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system for analyzing the thermal radiation damage of the fire hazard of the hazardous chemicals, which can ensure the effectiveness of fire radiation simulation and simultaneously improve the practical applicability of radiation simulation by simplifying simulation parameters so as to solve the problems that the existing simulation method is complex and the simulation process is easy to break down.
In order to achieve the purpose, the invention is realized by the following technical scheme: the invention provides a dangerous chemical fire thermal radiation damage analysis system which comprises a database module, a basic analysis module, a real-time acquisition module and a radiation analysis module;
the database module comprises a dangerous chemical data storage unit and a storage device data storage unit; the dangerous chemical data storage unit stores material physical and chemical parameters of dangerous chemicals, and the storage device data storage unit stores specification parameters of a storage device of the dangerous chemicals;
the basic analysis module comprises a chemical diffusion analysis unit and a storage device basic parameter analysis unit; the chemical diffusion analysis unit is used for carrying out simulation analysis on the diffusion speed of the dangerous chemicals; the storage device basic parameter analysis unit is used for carrying out simulation analysis on liquid leakage parameters of the storage device;
the real-time acquisition module is used for acquiring data in real time when a fire disaster occurs;
and the radiation analysis module performs comprehensive calculation analysis on the data stored in the database module and the data acquired in real time to obtain the radiation intensity of the dangerous chemicals in the case of fire.
Further, the chemical diffusion analysis unit comprises a liquid diffusion analysis subunit and a gas diffusion analysis subunit; the liquid diffusion analysis subunit is used for calculating and analyzing the leakage rate of the dangerous chemical of the liquid, and the gas diffusion analysis subunit is used for calculating and analyzing the leakage rate of the dangerous chemical of the gas;
the chemical diffusion analysis unit is configured with a chemical diffusion analysis strategy comprising: the leakage amount of the dangerous chemicals of the liquid is obtained by multiplying the leakage rate and the leakage time of the dangerous chemicals of the liquid;
the leakage amount of the dangerous chemicals of the gas is obtained by multiplying the leakage rate and the leakage time of the dangerous chemicals of the gas; wherein the unit of leakage amount is kg, and the unit of leakage rate is kg/s; the leak duration is in units of s.
Further, the liquid diffusion analysis subunit is configured with a liquid diffusion analysis strategy comprising: setting a liquid diffusion model, placing flammable liquid in a container with a first unit volume and internal pressure of the container being first unit pressure, and continuously leaking first simulation time through holes with a first specification size;
the leak rate of the liquid was calculated by the following liquid leak simulation equation:
in the formula, Q m The leakage rate of the liquid is expressed in kg/s; p is the pressure of the liquid in the container and has the unit of Pa; p is a radical of 0 Is ambient pressure in Pa; c 0 Is the liquid leakage coefficient; g is gravity acceleration, specifically 9.8m/s 2 (ii) a A is the area of the leakage hole and is given by m 2 (ii) a Rho is the liquid density in kg/m 3 ；h L The height of the liquid above the leakage hole is m;
the method for taking the liquid leakage coefficient specifically comprises the following steps: when the Reynolds number is more than 100, the liquid leakage coefficients of the holes in the circular shape, the triangular shape and the rectangular shape are 0.65, 0.6 and 0.55 respectively; when the Reynolds number is 100 or less, the liquid leakage coefficients of the holes in the circular, triangular and rectangular shapes are 0.5, 045 and 0.4, respectively.
Further, the gas diffusion analysis subunit is configured with a gas diffusion analysis strategy comprising: setting a gas diffusion model, placing inflammable gas in a container with a first unit volume and internal pressure of a first unit pressure, and continuously leaking first simulation time through holes with a first specification size;
the gas leak rate was calculated by the following calculation:
when the pressure difference between the inside and the outside of the container is satisfied
The calculation formula of the leakage rate of the gas is as follows:
when the pressure difference between the inside and the outside of the container is satisfied
The calculation formula of the leakage rate of the gas is as follows:
in the above formula: p is a radical of 0 Is ambient pressure in Pa; p is the gaseous fuel pressure in the vessel in Pa; k is the gas adiabatic index; q is the leakage rate of gas in kg/s; c d The gas leakage coefficient specifically takes the following values: when the shape of the hole is round, the hole is 1, when the hole is triangular, the hole is 0.95, and when the hole is rectangular, the hole is 0.9; m is the gas molar mass, and the unit is kg/mol; t is the initial temperature of the gas in K; r is a gas constant and has the unit of J/(mol · K).
Further, the storage device basic parameter analysis unit is configured with a storage device basic parameter analysis policy: the storage device basic parameter analysis strategy comprises the following steps: the container that stores liquid is provided with two kinds of diffusion detection state, and two kinds of diffusion detection state include: arranging and not arranging a fire bank at the periphery of the liquid storage container; setting the leakage range of the liquid as a liquid pool;
the diameter of the liquid pool when the fire bank is arranged is the diameter of the fire bank, and the specific calculation formula is as follows:
The calculation formula of the area of the liquid pool when the fire bank is not arranged is as follows:
Sy＝W/(H min x ρ); wherein, W is the leakage amount of the liquid and the unit is kg; rho is the leakage liquid density in kg/m 3 ；H min Is the minimum leakage material thickness in m;
the specific setting is as follows: when the ground properties are grassland, rough ground, flat ground, concrete ground and calm water, the minimum leakage material thickness is set to 0.02, 0.025, 0.01, 0.005 and 0.0018, respectively.
Further, the real-time acquisition module comprises a distance acquisition unit and a flame parameter acquisition unit, the distance acquisition unit is used for acquiring the distance between the radiation target and the flame central point, and the flame parameter acquisition unit is used for acquiring the specification data of the flame.
Further, the radiation analysis module comprises a liquid fire radiation analysis unit and a gas fire radiation analysis unit, wherein the liquid fire radiation analysis unit is used for calculating and analyzing the radiation intensity of the liquid dangerous chemicals during fire, and the gas fire radiation analysis unit is used for calculating and analyzing the radiation intensity of the gas dangerous chemicals during fire.
Further, the liquid fire radiation analysis unit is configured with a liquid radiation calculation strategy, which includes: calculating the intensity of heat radiation when the dangerous chemical of the liquid is in fire according to the following formula:
i = E' F τ; in the formula: i is the intensity of the heat radiation received by the target, kW/m 2 (ii) a E' is the average radiation intensity of the flame surface, kW/m 2 (ii) a F is a geometric view factor; τ is the atmospheric transmittance;
e' is obtained by the following calculation formula:
f is obtained by the following calculation formula:
τ is obtained by the following calculation:
τ＝1-0.058ln(x).
in the above formula: eta is an efficiency factor, and the value is 0.13-0.35; m is f Is the combustion rate of the material and has the unit of kg/(m) 2 ·s)；ΔH c The liquid combustion heat is expressed in kJ/kg; h is the flame height in m; rho 0 Is the air density in kg/m 3 (ii) a g is gravity acceleration with the unit of m/s 2 (ii) a x is the horizontal distance between the flame center and the target, and the unit is m; h is the ratio of the flame height to the radius of the liquid pool; s is the ratio of the distance from the target to the center of the liquid pool to the flame radius; f H And F V Representing the horizontal and vertical view factors of the vertical cylinder, respectively, a and B representing the first and second intermediate coefficients, respectively.
Further, the gas fire emission analysis unit is configured with a gas emission calculation strategy comprising: calculating the intensity of heat radiation when the dangerous chemical of the gas breaks out a fire according to the following formula:
in the formula: i (y) is the intensity of heat radiation at y, in kW/m 2 (ii) a Delta is an efficiency factor, and the value is 0.2; q is the material leakage rate in kg/s; h c The unit is kJ/kg of combustion heat of combustible gas; t is jet The radiance coefficient is 1-2; y is the distance from the flame center to the target center.
The invention has the beneficial effects that: the diffusion speed of dangerous chemicals can be simulated and analyzed through the chemical diffusion analysis unit of the basic analysis module; the liquid leakage parameters of the storage device can be simulated and analyzed through the storage device basic parameter analysis unit; the real-time acquisition module can be used for acquiring data in real time when a fire disaster occurs; and finally, the data stored in the database module and the data acquired in real time can be comprehensively calculated and analyzed through the radiation analysis module, and the radiation intensity of the dangerous chemical in the case of fire is obtained.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a functional block diagram of an analysis system of the present invention;
FIG. 2 is a schematic block diagram of a database module of the present invention;
FIG. 3 is a functional block diagram of the basic analysis module of the present invention;
FIG. 4 is a functional block diagram of a real-time acquisition module of the present invention;
FIG. 5 is a functional block diagram of a radiation analysis module of the present invention;
fig. 6 is a schematic view of the structure of the container for the liquid hazardous chemical and the fire dam according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example one
The embodiment provides a dangerous chemical fire thermal radiation damage analysis system, through simplifying simulation parameters, improves radiation simulation's practical application nature when can guaranteeing fire radiation simulation validity to solve the problem that current simulation method is comparatively complicated, simulation process breaks down easily.
Example one particular application is in the radiometric analysis of liquid hazardous chemicals in the event of a fire.
Referring to fig. 1, in particular, the analysis system includes a database module, a basic analysis module, a real-time acquisition module, and a radiation analysis module.
Referring to fig. 2, the database module includes a hazardous chemical data storage unit and a storage device data storage unit; the dangerous chemical data storage unit stores material physical and chemical parameters of dangerous chemicals, and the storage device data storage unit stores specification parameters of a storage device of the dangerous chemicals; the storage device basic parameter analysis unit is configured with a storage device basic parameter analysis strategy: the storage device basic parameter analysis strategy comprises the following steps: the container that stores liquid is provided with two kinds of diffusion detection states, and two kinds of diffusion detection states include: referring to fig. 6, a fire dam is disposed and not disposed at the periphery of the liquid storage container; setting the leakage range of the liquid as a liquid pool;
the diameter of the liquid pool when the fire bank is arranged is the diameter of the fire bank, and the specific calculation formula is as follows:
The calculation formula of the area of the liquid pool when the fire bank is not arranged is as follows:
Sy＝W/(H min x ρ); wherein, W is the leakage amount of the liquid and the unit is kg; rho is the leakage liquid density in kg/m 3 ；H min Is the minimum leakage material thickness in m;
the specific setting is as follows: when the ground properties are grassland, rough ground, flat ground, concrete ground and calm water, the minimum leakage material thickness is set to 0.02, 0.025, 0.01, 0.005 and 0.0018, respectively.
Referring to fig. 3, the basic analysis module includes a chemical diffusion analysis unit and a storage device basic parameter analysis unit; the chemical diffusion analysis unit is used for carrying out simulation analysis on the diffusion speed of the dangerous chemicals; the storage device basic parameter analysis unit is used for carrying out simulation analysis on the liquid leakage parameters of the storage device;
referring to fig. 4, the real-time acquisition module is configured to acquire data in real time when a fire occurs; the real-time acquisition module comprises a distance acquisition unit and a flame parameter acquisition unit, the distance acquisition unit is used for acquiring the distance between a radiation target and a flame central point, and the flame parameter acquisition unit is used for acquiring the specification data of flame.
Referring to fig. 5, the radiation analysis module performs comprehensive calculation and analysis on the data stored in the database module and the data collected in real time to obtain the radiation intensity of the dangerous chemical during fire.
Further, the air conditioner is characterized in that,
the chemical diffusion analysis unit comprises a liquid diffusion analysis subunit and a liquid diffusion analysis subunit, wherein the liquid diffusion analysis subunit is used for calculating and analyzing the leakage rate of dangerous chemicals in the liquid;
the chemical diffusion analysis unit is configured with a chemical diffusion analysis strategy comprising: the leakage amount of the dangerous chemicals of the liquid is obtained by multiplying the leakage rate and the leakage time of the dangerous chemicals of the liquid; the unit of leakage amount is kg, and the unit of leakage rate is kg/s; the unit of the leakage time length is s;
the liquid diffusion analysis subunit is configured with a liquid diffusion analysis strategy comprising: setting a liquid diffusion model, placing flammable liquid in a container with a first unit volume and internal pressure of the container being first unit pressure, and continuously leaking first simulation time through holes with a first specification size;
the leak rate of the liquid was calculated by the following liquid leak simulation equation:
in the formula, Q m The leakage rate of the liquid is expressed in kg/s; p is the pressure of the liquid in the container and has the unit of Pa; p is a radical of formula 0 Is ambient pressure in Pa; c 0 Is the liquid leakage coefficient; g is gravity acceleration, specifically 9.8m/s 2 (ii) a A is the area of the leakage hole in m 2 (ii) a Rho is the liquid density in kg/m 3 ；h L The height of the liquid above the leakage hole is m; wherein, in particular, reynoldsThe number is a dimensionless number that can be used to characterize fluid flow. The concrete expression is as follows: re = ρ vd/μ, where v, ρ, μ are the flow velocity, density and viscosity coefficient of the fluid, respectively, and d is a characteristic length. E.g., fluid flowing through a circular pipe, then d is the equivalent diameter of the pipe. The reynolds number can be used to distinguish whether the flow of the fluid is laminar or turbulent and can also be used to determine the resistance to flow of the object in the fluid.
The method for taking the liquid leakage coefficient specifically comprises the following steps: when the Reynolds number is more than 100, the liquid leakage coefficients of the round holes, the triangular holes and the rectangular holes are 0.65, 0.6 and 0.55 respectively; when the Reynolds number is less than or equal to 100, the liquid leakage coefficients of the round, triangular and rectangular holes are 0.5, 045 and 0.4 respectively; c 0 The setting mode of (2) is specifically referred to the following table:
liquid leakage coefficient value-taking table
| Reynolds number | Circular shape | Triangle shape | Rectangle |
| ＞100 | 0.65 | 0.6 | 0.55 |
| ≤100 | 0.5 | 0.45 | 0.4 |
Further, the air conditioner is characterized in that,
the radiation analysis module comprises a liquid fire radiation analysis unit which is used for calculating and analyzing the radiation intensity of the liquid dangerous chemicals when the liquid dangerous chemicals are in fire.
The liquid fire radiation analysis unit is provided with a liquid radiation calculation strategy, and the liquid radiation calculation strategy comprises the following steps: calculating the intensity of heat radiation when the dangerous chemical of the liquid is in fire according to the following formula:
i = E' F τ; in the formula: i is the intensity of the heat radiation received by the target, kW/m 2 (ii) a E' is the average radiation intensity of the flame surface, kW/m 2 (ii) a F is a geometric view factor; τ is the atmospheric transmittance;
e' is obtained by the following calculation formula:
f is obtained by the following calculation:
τ is obtained by the following calculation:
τ＝1-0.058ln(x)；
in the above formula: eta is an efficiency factor, and the value is 0.13-0.35; m is f Is the combustion rate of the material and has the unit of kg/(m) 2 ·s)；ΔH c The liquid combustion heat is expressed in kJ/kg; h is the flame height in m; rho 0 Is the air density in kg/m 3 (ii) a g is the acceleration of gravity in m/s 2 (ii) a x is the horizontal distance between the flame center and the target, and the unit is m; h is the ratio of the flame height to the radius of the liquid pool; s is the ratio of the distance from the target to the center of the liquid pool to the flame radius; f H And F V Representing the horizontal and vertical view factors of the vertical cylinder, respectively, a and B representing the first and second intermediate coefficients, respectively.
In the first embodiment, the parameters involved are the liquid pool diameter (if there is a fire bank accessible to measure the cofferdam area, if there is no fire bank, it is calculated by the maximum liquid pool area formula), the target distance (obtained by plane drawing measurement), the combustion heat (obtained by querying material physical property parameters), the combustion rate (obtained by querying material physical property parameters), the liquid density (obtained by querying material physical property parameters), and the flame height (obtained by proportional conversion using the infrared thermal radiation diagram in the prior art).
In the first embodiment, the letters in the first embodiment are specifically defined by reference to the specific explanations in the formulae.
Example two in real time
The analysis system in the second embodiment is applied to the radiation risk analysis of dangerous chemical substances in gas in the case of fire.
Specifically, referring to fig. 1-5, the analysis system includes a database module, a basic analysis module, a real-time acquisition module, and a radiation analysis module.
The database module comprises a dangerous chemical data storage unit and a storage device data storage unit; the dangerous chemical data storage unit stores material physical and chemical parameters of dangerous chemicals, and the storage device data storage unit stores specification parameters of a storage device of the dangerous chemicals;
the basic analysis module comprises a chemical diffusion analysis unit and a storage device basic parameter analysis unit; the chemical diffusion analysis unit is used for carrying out simulation analysis on the diffusion speed of the dangerous chemicals; the storage device basic parameter analysis unit is used for carrying out simulation analysis on the liquid leakage parameters of the storage device;
the real-time acquisition module is used for acquiring data in real time when a fire disaster occurs;
and the radiation analysis module performs comprehensive calculation analysis on the data stored in the database module and the data acquired in real time to obtain the radiation intensity of the dangerous chemicals in the case of fire.
Further, the air conditioner is provided with a fan,
the chemical diffusion analysis unit further comprises a gas diffusion analysis subunit; the gas diffusion analysis subunit is used for calculating and analyzing the leakage rate of the dangerous chemical of the gas;
the chemical diffusion analysis strategy also includes: the leakage amount of the dangerous chemicals of the gas is obtained by multiplying the leakage rate and the leakage time of the dangerous chemicals of the gas; the unit of leakage amount is kg, and the unit of leakage rate is kg/s; the unit of the leakage time length is s;
the gas diffusion analysis subunit is configured with a gas diffusion analysis strategy comprising: setting a gas diffusion model, placing inflammable gas in a container with a first unit volume and internal pressure of a first unit pressure, and continuously leaking first simulation time through holes with a first specification size;
the gas leak rate was calculated by the following calculation:
when the pressure difference between the inside and the outside of the container is satisfied
The calculation formula of the leakage rate of the gas is as follows:
when the pressure difference between the inside and the outside of the container is satisfied
The calculation formula of the leakage rate of the gas is as follows:
in the above formula: p is a radical of 0 Is ambient pressure in Pa; p is the gaseous fuel pressure in the vessel in Pa; k is the gas adiabatic index; q is the leakage rate of gas in kg/s; c d The gas leakage coefficient specifically takes the following values: when the shape of the hole is round, the hole is 1, when the hole is triangular, the hole is 0.95, and when the hole is rectangular, the hole is 0.9; m is the gas molar mass, and the unit is kg/mol; t is the initial temperature of the gas in K; r is a gas constant and has the unit of J/(mol. K).
Further, the air conditioner is provided with a fan,
the radiation analysis module also comprises a gas fire radiation analysis unit which is used for calculating and analyzing the radiation intensity of the dangerous chemical of the gas when a fire breaks out;
the gas fire radiation analysis unit is provided with a gas radiation calculation strategy, and the gas radiation calculation strategy comprises the following steps: calculating the intensity of heat radiation when the dangerous chemical of the gas breaks out the fire according to the following formula:
in the formula: i (y) is the intensity of heat radiation at y, in kW/m 2 (ii) a Delta is an efficiency factor, and the value is 0.2; q is the material leakage rate in kg/s; h c The unit is kJ/kg of combustion heat of combustible gas; t is jet The value of the radiance coefficient is 1-2; y is the distance from the flame center to the target center.
The actual parameters involved in the second embodiment are the material leakage rate (which can be calculated and obtained according to a gas leakage model), the combustion heat (which is obtained by inquiring material physical property parameters), and the target distance (which is obtained by measuring through a plane drawing).
Wherein, the letters in the second embodiment are specifically defined by referring to the specific explanations in the formulas.
EXAMPLE III
The analysis system provided by the third embodiment is mainly applied to a general method for calculating the radiation intensity of the fireball, and the nature of dangerous chemicals combusted by the analysis system is not limited to liquid or gas.
Wherein the heat radiation calculation formula for the fireball is as follows:
the calculation formula of the fireball combustion time is as follows:
in the formula: t is t ball Is fireball duration in units of s; m is the mass of the material, and the unit is kg.
The calculation formula of the fireball diameter is as follows:
the calculation formula of fireball height is:
the calculation formula of the thermal radiation intensity of the fireball to the target is as follows:
I＝I 0 vτ
in the formula: d is the combustion diameter of the fireball, and the unit is m; h is the rising height of the fireball, and the unit is m; f is the emissivity coefficient, and is taken as 0.15; Δ H c Is the heat of combustion in kj/kg; v is a view angle coefficient; tau is the atmospheric permeability coefficient and generally takes a value between 1 and 2; x is the target to fireball distance in m.
Wherein, the input parameters are material quantity (obtained by calculation of a leakage estimation model), combustion heat (obtained by inquiring material physical property parameters) and target distance (obtained by measurement of a plane drawing), and the specific explanation in the specific expression reference formula of the letters in the third embodiment is as follows.
Example four
The analysis system provided in the fourth embodiment mainly performs specific analysis on the radiation intensities obtained in the three embodiments;
specifically, the analysis system further comprises a thermal radiation damage setting strategy comprising: the following damage mapping table is set according to the actual heat radiation amount, specifically as follows:
damage to people and equipment from different thermal radiation fluxes
According to the thermal radiation damage criteria shown in the above table, it is considered that when the target building is subjected to thermal radiation, the intensity of the thermal radiation is less than 12.5kW/m 2 When the target building is subjected to the heat radiation intensity reaching or exceeding 12.5kW/m, the target building is not generally caused to catch fire 2 In time, the target structure may be affected by heat radiation to cause a fire.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the following descriptions are only illustrative and not restrictive, and that the scope of the present invention is not limited to the above embodiments: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (1)
1. The system for analyzing the thermal radiation damage of the dangerous chemical fire is characterized by comprising a database module, a basic analysis module, a real-time acquisition module and a radiation analysis module;
the database module comprises a dangerous chemical data storage unit and a storage device data storage unit; the dangerous chemical data storage unit stores material physical and chemical parameters of dangerous chemicals, and the storage device data storage unit stores specification parameters of a storage device of the dangerous chemicals;
the basic analysis module comprises a chemical diffusion analysis unit and a storage device basic parameter analysis unit; the chemical diffusion analysis unit is used for carrying out simulation analysis on the diffusion speed of the dangerous chemicals; the storage device basic parameter analysis unit is used for carrying out simulation analysis on liquid leakage parameters of the storage device;
the real-time acquisition module is used for acquiring data in real time when a fire disaster occurs;
the radiation analysis module performs comprehensive calculation analysis on the data stored in the database module and the data acquired in real time to obtain the radiation intensity of the dangerous chemicals in the case of fire;
the chemical diffusion analysis unit comprises a liquid diffusion analysis subunit and a gas diffusion analysis subunit; the liquid diffusion analysis subunit is used for calculating and analyzing the leakage rate of the dangerous chemical of the liquid, and the gas diffusion analysis subunit is used for calculating and analyzing the leakage rate of the dangerous chemical of the gas;
the chemical diffusion analysis unit is configured with a chemical diffusion analysis strategy comprising: the leakage amount of the dangerous chemicals of the liquid is obtained by multiplying the leakage rate and the leakage time of the dangerous chemicals of the liquid;
the leakage amount of the dangerous chemicals of the gas is obtained by multiplying the leakage rate and the leakage time of the dangerous chemicals of the gas; wherein the unit of leakage amount is kg, and the unit of leakage rate is kg/s; the unit of the leakage time length is s;
the liquid diffusion analysis subunit is configured with a liquid diffusion analysis strategy that includes: setting a liquid diffusion model, placing flammable liquid in a container with a first unit volume and internal pressure of the container being first unit pressure, and continuously leaking first simulation time through holes with a first specification size;
the leak rate of the liquid was calculated by the following liquid leak simulation equation:
in the formula, Q m The leakage rate of the liquid is expressed in kg/s; p is the pressure of the liquid in the container and has the unit of Pa; p is a radical of 0 Is ambient pressure in Pa; c 0 Is the liquid leakage coefficient; g is gravity acceleration, specifically 9.8m/s 2 (ii) a A is the area of the leakage hole and is given by m 2 (ii) a Rho is the liquid density in kg/m 3 ；h L The height of the liquid above the leakage hole is m;
the method for taking the liquid leakage coefficient specifically comprises the following steps: when the Reynolds number is more than 100, the liquid leakage coefficients of the round holes, the triangular holes and the rectangular holes are 0.65, 0.6 and 0.55 respectively; when the Reynolds number is less than or equal to 100, the liquid leakage coefficients of the round, triangular and rectangular holes are 0.5, 045 and 0.4 respectively;
the gas diffusion analysis subunit is configured with a gas diffusion analysis strategy comprising: setting a gas diffusion model, placing inflammable gas in a container with a first unit volume and internal pressure of a first unit pressure, and continuously leaking first simulation time through holes with a first specification size;
the gas leak rate was calculated by the following calculation:
when the pressure difference between the inside and the outside of the container is satisfied
The calculation formula of the leakage rate of the gas is as follows:
when the pressure difference between the inside and the outside of the container is satisfied
The calculation formula of the leakage rate of the gas is as follows:
in the above formula: p is a radical of 0 Is ambient pressure in Pa; p is the gaseous fuel pressure in the vessel in Pa; k is the gas adiabatic index; q is the leakage rate of gas in kg/s; c d The gas leakage coefficient specifically takes the following values: when the shape of the hole is round, the hole is 1, when the hole is triangular, the hole is 0.95, and when the hole is rectangular, the hole is 0.9; m is the gas molar mass inIs kg/mol; t is the initial temperature of the gas in K; r is a gas constant and has the unit of J/(mol.K);
the storage device basic parameter analysis unit is configured with a storage device basic parameter analysis strategy: the storage device basic parameter analysis strategy comprises the following steps: the container that stores liquid is provided with two kinds of diffusion detection states, and two kinds of diffusion detection states include: arranging and not arranging a fire bank at the periphery of the liquid storage container; setting the leakage range of the liquid as a liquid pool;
the diameter of the liquid pool when the fire bank is arranged is the diameter of the fire bank, and the specific calculation formula is as follows:
The calculation formula of the area of the liquid pool when the fire bank is not arranged is as follows:
Sy＝W/(H min x ρ); wherein, W is the leakage amount of the liquid and the unit is kg; rho is the leakage liquid density in kg/m 3 ；H min Is the minimum leakage material thickness in m;
the specific setting is as follows: when the ground properties are grassland, rough ground, flat ground, concrete ground and calm water, the thicknesses of the minimum leakage materials are respectively and correspondingly set to be 0.02, 0.025, 0.01, 0.005 and 0.0018;
the real-time acquisition module comprises a distance acquisition unit and a flame parameter acquisition unit, the distance acquisition unit is used for acquiring the distance between a radiation target and a flame central point, and the flame parameter acquisition unit is used for acquiring the specification data of flame;
the radiation analysis module comprises a liquid fire radiation analysis unit and a gas fire radiation analysis unit, the liquid fire radiation analysis unit is used for calculating and analyzing the radiation intensity of liquid dangerous chemicals when a fire breaks out, and the gas fire radiation analysis unit is used for calculating and analyzing the radiation intensity of gas dangerous chemicals when a fire breaks out;
the liquid fire radiation analysis unit is configured with a liquid radiation calculation strategy, and the liquid radiation calculation strategy comprises the following steps: calculating the intensity of heat radiation when the dangerous chemical of the liquid is in fire according to the following formula:
i = E' F τ; in the formula: i is the intensity of the heat radiation received by the target, kW/m 2 (ii) a E' is the average radiation intensity of the flame surface, kW/m 2 (ii) a F is a geometric view factor; τ is the atmospheric transmittance;
e' is obtained by the following calculation formula:
f is obtained by the following calculation:
wherein, the calculation formulas of A and B are as follows:
τ is obtained by the following calculation:
τ＝1-0.058ln(x)；
in the above formula: eta is an efficiency factor, and the value of eta is 0.13-0.35; m is f Is the combustion rate of the material and has the unit of kg/(m) 2 ·s)；ΔH c The liquid combustion heat is expressed in kJ/kg; h is the flame height in m; ρ is a unit of a gradient 0 Is the air density in kg/m 3 (ii) a g is gravity acceleration with the unit of m/s 2 (ii) a x is the horizontal distance between the flame center and the target, and the unit is m; h is the ratio of the flame height to the radius of the liquid pool; s is the ratio of the distance from the target to the center of the liquid pool to the flame radius; f H And F V Representing the horizontal and vertical view factors of a vertical cylinder, respectively, a and B representing a first intermediate coefficient and a second intermediate coefficient, respectively;
the gas fire radiation analysis unit is configured with a gas radiation calculation strategy, which comprises: calculating the intensity of heat radiation when the dangerous chemical of the gas breaks out the fire according to the following formula:
in the formula: i (y) is the intensity of heat radiation at y in kW/m 2 (ii) a Delta is an efficiency factor, and the value is 0.2; q is the leakage rate of the material, and the unit is kg/s; h c The unit is kJ/kg of combustion heat of combustible gas; t is a unit of jet The value of the radiance coefficient is 1-2; y is the distance from the flame center to the target center.
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