CN108108545A - Display methods and device are deduced in fire incident simulation based on GIS-Geographic Information System - Google Patents
Display methods and device are deduced in fire incident simulation based on GIS-Geographic Information System Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 31
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Abstract
The invention discloses a kind of fire incident simulations based on GIS-Geographic Information System to deduce display methods and device.Method includes：Boiling point, heat of gasification, specific heat capacity at constant pressure and the combustion heat of the environment temperature for obtaining liquid leakage region and the liquid for triggering fire；According to the boiling point of environment temperature and liquid, heat of gasification, specific heat capacity at constant pressure and the combustion heat, the burning velocity of unit area on liquid surface is obtained；Obtain the atmospheric density in liquid leakage radius and liquid leakage region；According to liquid leakage radius and atmospheric density, the flame height in liquid leakage region is obtained；According to burning velocity and flame height, the thermal radiation flux in liquid leakage region is obtained；Obtain the distance at objective to the liquid leakage center specified；According to the air coefficient of heat conduction, thermal radiation flux and the distance in fire thermal radiation area, the Incidence heat radiation power of objective is obtained；According to Incidence heat radiation power, fire damage situation is shown on map.
Description
Technical Field
The invention belongs to the field of petroleum pipeline transportation, and particularly relates to a fire accident simulation deduction display method and device based on a geographic information system.
Background
Petroleum, one of the main objects of geological exploration, is a viscous, dark brown liquid. The petroleum has wide application, and can be used for refining diesel oil and gasoline; and is also a raw material of many chemical industry products, such as solution, fertilizer, pesticide, plastics and the like.
The transportation of oil is divided into land transportation and sea transportation. The land transportation mainly adopts pipeline transportation, and pipeline transportation is the 'fifth transportation mode' following four transportation modes of road, railway, sea transportation and air transportation, and is a mode for transporting fluid cargos by pipelines, and the pipeline transportation method has the advantages of good timeliness, no limitation of day and night and weather, and poor flexibility. The marine transportation mainly adopts the transportation mode of large-scale oil tankers and the like, and has the advantages of low marine transportation cost, large transportation volume and longer time.
In the operation management of pipeline transportation, various emergency response systems have been proposed for manufacturers of pipeline transportation facilities in different industries in order to prevent potential troubles due to pipeline defects. For example, an emergency response System currently used in the petrochemical industry may provide specific Information such as a scene image, a scene sound, and an accident location, and the emergency response System uses a Geographic Information System (GIS) technology and a spatial technology, so that Geographic data and map Information can be stored, managed, applied, and analyzed, and spatial data can be patterned and informationized. Meanwhile, the emergency response system can help to command, dispatch and allocate related resources in the emergency treatment of accidents. Specifically, the emergency response system can locate the accident site by using a geographic information technology, and inquire the surrounding environment and emergency facilities; the emergency response system can utilize communication technology to establish communication among all related departments so as to achieve uniform resource allocation.
However, most of the existing emergency response systems can only view information related to the accident and treatment progress of the accident scene, and cannot reasonably simulate the influence range of the deduced accident and the loss of the accident. Therefore, the difficulty coefficient of a decision director is improved, so that an accident situation is easy to occur, and the influence range of the accident is further expanded.
The above-described background art is merely technical information which is held by the inventors for deriving the embodiments of the present invention or learned in the derivation process, and is not necessarily a known art which has been disclosed in the general public before the filing of the embodiments of the present invention.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: most emergency response systems in the prior art can only check information related to an accident and treatment progress of an accident scene, and cannot reasonably simulate the influence range of the deduced accident and the loss of the accident.
In order to solve the technical problem, the invention provides a fire accident simulation deduction display method and device based on a geographic information system.
According to an aspect of the present invention, an embodiment of the present invention provides a fire accident simulation deduction display method based on a geographic information system, including:
acquiring the environmental temperature of a liquid leakage area, and the boiling point, the gasification heat, the specific constant pressure heat capacity and the combustion heat of liquid which triggers fire;
obtaining the combustion speed of the unit area on the liquid surface according to the environmental temperature, the boiling point, the gasification heat, the specific constant pressure heat capacity and the combustion heat of the liquid;
acquiring a liquid leakage radius and an air density of a liquid leakage area;
obtaining the flame height of the liquid leakage area according to the liquid leakage radius and the air density;
obtaining the heat radiation flux of the liquid leakage area according to the combustion speed and the flame height;
acquiring the distance from a specified target site to the liquid leakage center;
obtaining the incident thermal radiation intensity of the target site according to the atmospheric thermal conductivity coefficient, the thermal radiation flux and the distance in the thermal radiation area of the fire; and
and displaying the fire loss condition on a map according to the incident heat radiation intensity.
Preferably, the combustion speed is obtained according to the following expression:
wherein,is the combustion speed, HcIs the heat of combustion of the liquid, cpIs the specific constant pressure heat capacity, T, of the liquidbIs the boiling point of the liquid, T0And H is the vaporization heat of the liquid.
Preferably, the flame height is obtained according to the following expression:
wherein h is the flame height, r is the liquid leakage radius, ρ0G is the acceleration of gravity, which is the air density.
Preferably, the thermal radiation flux is obtained according to the following expression:
where Q is the thermal radiation flux and η is the efficiency factor.
Preferably, the value of the efficiency factor η ranges from 0.13 to 0.35.
Preferably, the intensity of incident thermal radiation at the target site is obtained according to the following expression:
wherein I is the incident thermal radiation intensity of the target site, tcX is the distance from the target point to the center of the liquid leak, which is the atmospheric heat transfer coefficient in the heat radiation area of the fire.
Preferably, the method for displaying the fire loss condition on the map according to the incident heat radiation intensity comprises the following steps:
when the incident heat radiation intensity of the target site is less than 12.5W/m2When the map is marked, the position corresponding to the target place on the map is not marked;
when the incident heat radiation intensity of the target site is greater than or equal to 12.5W/m2And less than 25W/m2Then, marking the position corresponding to the target place on the map as a first color;
when the incident heat radiation intensity of the target site is more than or equal to 25W/m2And less than 37.5W/m2Then, marking the position corresponding to the target place on the map as a second color; and
when the incident heat radiation intensity of the target site is not less than 37.5W/m2Then, marking the position corresponding to the target place on the map as a third color;
wherein the hues of the first, second, and third colors are gradually decreased.
Preferably, the fire-initiating liquid is crude oil or product oil.
According to another aspect of the present invention, an embodiment of the present invention provides a fire accident simulation deduction display device based on a geographic information system, including:
the first acquisition module is used for acquiring the environmental temperature of the liquid leakage area, the boiling point, the gasification heat, the specific constant pressure heat capacity and the combustion heat of liquid which triggers fire;
the first calculation module is used for obtaining the combustion speed of the unit area on the liquid surface according to the environment temperature, the boiling point, the gasification heat, the specific constant pressure heat capacity and the combustion heat of the liquid;
the second acquisition module is used for acquiring the liquid leakage radius and the air density of the liquid leakage area;
the second calculation module is used for obtaining the flame height of the liquid leakage area according to the liquid leakage radius and the air density;
the third calculation module is used for obtaining the heat radiation flux of the liquid leakage area according to the combustion speed and the flame height;
the third acquisition module is used for acquiring the distance from the specified target point to the liquid leakage center;
the fourth calculation module is used for obtaining the incident thermal radiation intensity of the target place according to the atmospheric thermal conduction coefficient, the thermal radiation flux and the distance in the fire thermal radiation area; and
and the display module is used for displaying the fire loss condition on a map according to the incident thermal radiation intensity.
Preferably, the fire-initiating liquid is crude oil or product oil.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by applying the fire accident simulation deduction display method and device based on the geographic information system, which are provided by the embodiment of the invention, the incident thermal radiation intensity of a target site can be calculated according to related parameters, and the fire loss condition can be visually displayed on a map, so that the defects that only information related to an accident and the handling progress of an accident site can be checked in the prior art are overcome, more visual and effective reference information can be provided for a commander, the commander can conveniently and timely obtain decision-making basis information, the probability of an accident is reduced, and the influence range of the accident is further expanded.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flowchart of a fire accident simulation deduction display method based on a geographic information system according to an embodiment of the present invention;
fig. 2 is a block diagram of a fire accident simulation deduction display device based on a geographic information system according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In order to overcome the defects that most emergency response systems in the prior art can only check information related to an accident and the handling progress of an accident site, and cannot reasonably simulate the influence range of a deduced accident and the loss of the accident, the embodiment of the invention provides a fire accident simulation deduction display method based on a geographic information system, which can evaluate and analyze the influence range and the loss of the fire accident and visually display the analysis result. The method is described below with reference to the figures and examples.
It should be noted that a fire accident in the chemical industry is often caused by leakage of a liquid transported in a pipeline. The destruction of a fire event is primarily thermal radiation. The present invention uses the incident thermal radiation intensity to evaluate the damage, and in the method, the incident thermal radiation intensity of each target site around the center of the liquid leakage is calculated with the center as the center.
In summary, the fire accident simulation deduction display method based on the geographic information system in the embodiment of the invention can be applied to an in-plant pipeline and an out-plant pipeline so as to simulate a fire accident caused by liquid leakage. In the fire accident simulation deduction display method based on the geographic information system, the data such as the thermal radiation range, the minor injury radius, the second-degree burn radius and the like of the fire accident can be analyzed by combining the pipeline rupture aperture, the operation parameters, the material characteristics, the meteorological information, the analysis model and the like, and the simulation analysis result can be displayed through a three-dimensional picture. Aiming at fire accidents, the storage quantity of pipeline-associated medium pipes can be analyzed, the combustion time of the existing medium is calculated, the fire fighting capacity and the pollution discharge capacity are analyzed, and decision support is provided for emergency rescue.
Fig. 1 is a flowchart illustrating a fire accident simulation deduction display method based on a geographic information system according to an embodiment of the present invention.
As shown in fig. 1, the fire accident simulation deduction display method based on the geographic information system according to the embodiment of the present invention mainly includes the following steps S101 to S108.
Step S101, obtaining the environmental temperature of the liquid leakage area, the boiling point of the liquid causing fire, the vaporization heat, the specific constant pressure heat capacity and the combustion heat.
Step S102, obtaining the combustion speed per unit area on the liquid surface according to the environmental temperature, the boiling point of the liquid, the vaporization heat, the specific constant pressure heat capacity and the combustion heat.
Step S103, acquiring the liquid leakage radius and the air density of the liquid leakage area.
And step S104, obtaining the flame height of the liquid leakage area according to the liquid leakage radius and the air density.
And step S105, obtaining the heat radiation flux of the liquid leakage area according to the combustion speed and the flame height.
Step S106, acquiring the distance from the specified target position to the liquid leakage center.
And step S107, obtaining the incident thermal radiation intensity of the target place according to the atmospheric heat conduction coefficient, the thermal radiation flux and the distance in the fire thermal radiation area.
And step S108, displaying the fire loss condition on a map according to the incident heat radiation intensity.
Specifically, first, the kind of fire-causing liquid transported in the pipeline is detected. Here, preferably, the liquid is crude oil or product oil.
Then, step S101 is performed: obtaining data of boiling point, vaporization heat, specific constant pressure heat capacity and combustion heat of liquid triggering fire through preliminary experimental measurement, and storing the obtained data in a database of a fire accident simulation device system; data on the ambient temperature of the liquid leakage area is obtained by field measurement (for example, by weather forecast software, a thermometer and the like in a mobile phone), and the data is manually input into the fire accident simulation device system.
Next, step S102 is executed: based on the ambient temperature and the data of the boiling point, the heat of vaporization, the specific constant pressure heat capacity, and the heat of combustion of the liquid obtained in step S101, the combustion rate per unit area on the surface of the liquid is obtained according to the following expression:
in the expression (1) above, the compound (I),the combustion rate is expressed in kg/(m)2·s)；
HcThe combustion heat of the liquid is J/kg;
cpthe specific constant pressure heat capacity of the liquid is expressed by J/(kg. K);
Tbis the boiling point of the liquid, in K;
T0is ambient temperature in K;
h is the heat of vaporization of the liquid, and the unit is J/kg.
Next, step S103 is executed: obtaining data of the liquid leakage radius through field measurement (for example, through equipment such as an unmanned aerial vehicle) and manually inputting the data into a fire accident simulation device system; data on the air density of the liquid leakage area is obtained through preliminary experimental measurements and stored in a database of the fire accident simulation apparatus system.
Next, step S104 is executed: based on the data of the liquid leakage radius and the air density of the liquid leakage area obtained in step S103, the flame height of the liquid leakage area is obtained according to the following expression:
in the expression (2), h is the flame height and the unit is m;
r is the liquid leakage radius in m;
ρ0is the air density in kg/m3；
g is the acceleration of gravity in m/s2。
Next, step S105 is executed: based on the combustion speed obtained in step S102 and the flame height obtained in step S104, the heat radiation flux of the liquid leakage region is obtained according to the following expression:
in the expression (3), Q is heat radiation flux and has a unit of W;
η is an efficiency factor, and the value range is between 0.13 and 0.35 according to different scenes.
Next, step S106 is executed: data on the distance from the designated target site to the liquid leakage center is obtained through field measurement, and the data is manually input into the fire accident simulation device system.
Next, step S107 is executed: based on the data of the atmospheric heat conduction coefficient in the heat radiation area of the fire, the heat radiation flux obtained at step S105, and the distance obtained at step S106, the incident heat radiation intensity at the target site is obtained according to the following expression:
in the expression (4), I is the incident heat radiation intensity of the target site in W/m2；
tcIs the atmospheric heat transfer coefficient in the heat radiation region of the fire, where tcTaking 1 as a fixed value;
x is the distance in m from the specified target site to the center of the liquid leak.
Finally, step S108 is performed: and displaying the fire loss condition on a map according to the incident heat radiation intensity.
Specifically, according to the range of the incident thermal radiation intensity of the target location, the position corresponding to the target location is marked with different colors on the second display screen of the map. Here, the "map" refers to an electronic map of an accident scene provided in a geographic information system, and the first and second display screens are different display screens of the electronic map, for example, an explosion impact effect display screen and a fire heat radiation display screen.
In a specific embodiment, the intensity of the incident thermal radiation at the target site is less than 12.5W/m for the effects of the thermal radiation from the fire2In the process, the corresponding target places of the second display picture of the map are not marked, and the places are indicated as slight loss areas.
When the incident heat radiation intensity of the target site is greater than or equal to 12.5W/m2And less than 25W/m2Then, the position corresponding to the target location is marked as a first color on the second display screen of the map, which indicates that the locations are moderate loss areas and the human mortality rate is 1%/1 min.
When the incident heat radiation intensity of the target site is not less than 25W/m2And less than 37.5W/m2Then, the position corresponding to the target location is marked as a second color on a second display screen of the map, which indicates that the locations are serious loss areas and the human death rate is 100%/1 min.
When the incident heat radiation intensity of the target site is not less than 37.5W/m2In the meantime, the position corresponding to the target location is marked as a third color on the second display screen of the map, which indicates that the locations are major loss areas, the human death rate is 100%/1 min, and the damage rate of the equipment is 100%.
Preferably, the hues of the first, second and third colors are gradually decreased.
It should be noted that the specific colors of the first to third colors can be flexibly selected and set to highlight the loss levels of the respective different regions. For example, the first color is set to green, the second color is set to yellow, and the third color is set to red.
In this way, the influence range and the consequences of a fire accident are simulated and displayed according to the different color distributions of the second display picture of the map. The commander can intuitively obtain corresponding information to conduct command coordination work, so that accident handling is safely and effectively expanded.
It should be noted that the fire accident simulation deduction display method based on the geographic information system of the present invention is not limited to the above-described execution sequence, and when some embodiments can be implemented in different implementations, the execution sequence may be different from the described sequence. In other words, in the present invention, after determining the kind of the liquid causing the fire, the steps S103 and S104 may be performed to obtain the flame height of the liquid leakage region, and then the steps S101 and S102 may be performed to obtain the combustion speed per unit area on the surface of the liquid, and then the steps S105, S106, S107, and S108 may be performed in sequence.
In summary, according to the fire accident simulation deduction display method based on the geographic information system provided by the embodiment of the invention, the incident thermal radiation intensity of the target site can be calculated according to the related parameters, and the fire loss condition can be visually displayed on the map, so that the defects that only the information related to the accident and the handling progress of the accident site can be checked in the prior art are overcome, more visual and effective reference information can be provided for a commander, the commander can conveniently and timely obtain decision-making basis information, the probability of accidents is reduced, and the influence range of the accidents is further expanded.
Correspondingly, the embodiment of the invention also provides a fire accident simulation deduction display device based on the geographic information system.
Fig. 2 is a block diagram of a fire accident simulation deduction display device based on a geographic information system according to an embodiment of the present invention.
As shown in fig. 2, the fire accident simulation deduction display device based on the geographic information system according to the embodiment of the present invention mainly includes: a first obtaining module 101, a first calculating module 102, a second obtaining module 103, a second calculating module 104, a third calculating module 105, a third obtaining module 106, a fourth calculating module 107 and a display module 108.
Specifically, the first acquiring module 101 is configured to acquire an ambient temperature of the liquid leakage area, and a boiling point, vaporization heat, specific constant pressure heat capacity, and combustion heat of the liquid that causes a fire.
The first calculation module 102 is configured to obtain a combustion speed per unit area on the liquid surface according to the ambient temperature, the boiling point of the liquid, the heat of vaporization, the specific constant pressure heat capacity, and the combustion heat.
And the second acquiring module 103 is used for acquiring the liquid leakage radius and the air density of the liquid leakage area.
And the second calculation module 104 is used for obtaining the flame height of the liquid leakage area according to the liquid leakage radius and the air density.
And a third calculation module 105 for obtaining the heat radiation flux of the liquid leakage area according to the combustion speed and the flame height.
And a third obtaining module 106 for obtaining the distance from the specified target point to the liquid leakage center.
And the fourth calculation module 107 is used for obtaining the incident thermal radiation intensity of the target place according to the atmospheric heat conduction coefficient, the thermal radiation flux and the distance in the fire thermal radiation area.
And the display module 108 is used for displaying the fire loss condition on a map according to the incident heat radiation intensity.
For detailed details of the operations in the modules, reference may be made to the description of the method of the present invention in conjunction with fig. 1, and details are not described here again.
In summary, the fire accident simulation deduction display device based on the geographic information system according to the embodiment of the present invention can calculate the incident thermal radiation intensity of the target location according to the related parameters, and visually display the fire loss on the map, so as to overcome the defects that only the information related to the accident and the handling progress of the accident site can be checked in the prior art, provide more visual and effective reference information for the commander, enable the commander to conveniently and timely obtain decision-making basis information, reduce the probability of accidents, and further prevent the influence range of the accidents from further expanding.
Those skilled in the art will appreciate that the modules or steps of the invention described above can be implemented in a general purpose computing device, centralized on a single computing device or distributed across a network of computing devices, and optionally implemented in program code that is executable by a computing device, such that the modules or steps are stored in a memory device and executed by a computing device, fabricated separately into integrated circuit modules, or fabricated as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A fire accident simulation deduction display method based on a geographic information system is characterized by comprising the following steps:
acquiring the environmental temperature of a liquid leakage area, and the boiling point, the gasification heat, the specific constant pressure heat capacity and the combustion heat of liquid which triggers fire;
obtaining the combustion speed of the unit area on the liquid surface according to the environmental temperature, the boiling point, the gasification heat, the specific constant pressure heat capacity and the combustion heat of the liquid;
acquiring a liquid leakage radius and an air density of a liquid leakage area;
obtaining the flame height of the liquid leakage area according to the liquid leakage radius and the air density;
obtaining the heat radiation flux of the liquid leakage area according to the combustion speed and the flame height;
acquiring the distance from a specified target site to the liquid leakage center;
obtaining the incident thermal radiation intensity of the target site according to the atmospheric thermal conductivity coefficient, the thermal radiation flux and the distance in the thermal radiation area of the fire; and
and displaying the fire loss condition on a map according to the incident heat radiation intensity.
2. The method of claim 1, wherein the combustion rate is derived according to the expression:
<mrow> <mfrac> <mrow> <mi>d</mi> <mi>m</mi> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>=</mo> <mfrac> <mrow> <mn>0.001</mn> <msub> <mi>H</mi> <mi>c</mi> </msub> </mrow> <mrow> <msub> <mi>c</mi> <mi>p</mi> </msub> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>b</mi> </msub> <mo>-</mo> <msub> <mi>T</mi> <mn>0</mn> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mi>H</mi> </mrow> </mfrac> </mrow>
wherein,is the combustion speed, HcIs the heat of combustion of the liquid, cpIs the specific constant pressure heat capacity, T, of the liquidbIs the liquidBoiling point of (1), T0And H is the vaporization heat of the liquid.
3. The method of claim 2, wherein the flame height is obtained according to the expression:
<mrow> <mi>h</mi> <mo>=</mo> <mn>84</mn> <mi>r</mi> <msup> <mrow> <mo>&lsqb;</mo> <mfrac> <mrow> <mi>d</mi> <mi>m</mi> <mo>/</mo> <mi>d</mi> <mi>t</mi> </mrow> <mrow> <msub> <mi>&rho;</mi> <mn>0</mn> </msub> <msup> <mrow> <mo>(</mo> <mn>2</mn> <mi>g</mi> <mi>r</mi> <mo>)</mo> </mrow> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </msup> </mrow> </mfrac> <mo>&rsqb;</mo> </mrow> <mn>0.6</mn> </msup> </mrow>
wherein h is the flame height, r is the liquid leakage radius, ρ0G is the acceleration of gravity, which is the air density.
4. A method according to claim 3, characterized in that said thermal radiation flux is obtained according to the following expression:
<mrow> <mi>Q</mi> <mo>=</mo> <mrow> <mo>(</mo> <msup> <mi>&pi;r</mi> <mn>2</mn> </msup> <mo>+</mo> <mn>2</mn> <mi>&pi;</mi> <mi>r</mi> <mi>h</mi> <mo>)</mo> </mrow> <mfrac> <mrow> <mi>d</mi> <mi>m</mi> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>&CenterDot;</mo> <mi>&eta;</mi> <mo>.</mo> <msub> <mi>H</mi> <mi>c</mi> </msub> <mo>/</mo> <mo>&lsqb;</mo> <mn>72</mn> <msup> <mrow> <mo>(</mo> <mfrac> <mrow> <mi>d</mi> <mi>m</mi> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>)</mo> </mrow> <mn>0.60</mn> </msup> <mo>+</mo> <mn>1</mn> <mo>&rsqb;</mo> </mrow>
where Q is the thermal radiation flux and η is the efficiency factor.
5. The method of claim 4, wherein the efficiency factor η is between 0.13 and 0.35.
6. The method of claim 5, wherein the intensity of incident thermal radiation at the target site is obtained according to the following expression:
<mrow> <mi>I</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Qt</mi> <mi>c</mi> </msub> </mrow> <mrow> <mn>4</mn> <msup> <mi>&pi;X</mi> <mn>2</mn> </msup> </mrow> </mfrac> </mrow>
wherein I is the incident thermal radiation intensity of the target site, tcX is the distance from the target point to the center of the liquid leak, which is the atmospheric heat transfer coefficient in the heat radiation area of the fire.
7. The method according to any one of claims 1 to 6, wherein displaying a fire loss condition on a map based on the incident thermal radiation intensity comprises:
when the incident heat radiation intensity of the target site is less than 12.5W/m2When the map is marked, the position corresponding to the target place on the map is not marked;
when the incident heat radiation intensity of the target site is greater than or equal to 12.5W/m2And less than 25W/m2Then, marking the position corresponding to the target place on the map as a first color;
when the incident heat radiation intensity of the target site is more than or equal to 25W/m2And less than 37.5W/m2Then, marking the position corresponding to the target place on the map as a second color; and
when the incident heat radiation intensity of the target site is not less than 37.5W/m2Then, marking the position corresponding to the target place on the map as a third color;
wherein the hues of the first, second, and third colors are gradually decreased.
8. The method of claim 1, wherein the fire-initiating liquid is crude oil or product oil.
9. A fire accident simulation deduction display device based on a geographic information system is characterized by comprising:
the first acquisition module is used for acquiring the environmental temperature of the liquid leakage area, the boiling point, the gasification heat, the specific constant pressure heat capacity and the combustion heat of liquid which triggers fire;
the first calculation module is used for obtaining the combustion speed of the unit area on the liquid surface according to the environment temperature, the boiling point, the gasification heat, the specific constant pressure heat capacity and the combustion heat of the liquid;
the second acquisition module is used for acquiring the liquid leakage radius and the air density of the liquid leakage area;
the second calculation module is used for obtaining the flame height of the liquid leakage area according to the liquid leakage radius and the air density;
the third calculation module is used for obtaining the heat radiation flux of the liquid leakage area according to the combustion speed and the flame height;
the third acquisition module is used for acquiring the distance from the specified target point to the liquid leakage center;
the fourth calculation module is used for obtaining the incident thermal radiation intensity of the target place according to the atmospheric thermal conduction coefficient, the thermal radiation flux and the distance in the fire thermal radiation area; and
and the display module is used for displaying the fire loss condition on a map according to the incident thermal radiation intensity.
10. The apparatus of claim 9, wherein the fire-initiating liquid is crude oil or product oil.
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