A fire environment prediction analysis system

Abstract

The present application relates to a kind of fire environment prediction analysis systems, comprising: input module is used to input the combustion of prediction occurrence combustion and environmental parameter;Project library module is pre-stored in the project of combustion that combustion needs to be predicted and analyzed, project library module is matched with the combustion parameter of the combustion of prediction occurrence combustion and environmental parameter;Calculation module is obtained by preset formula calculation one carbon monoxide production, flame height and emission rate after the combustion of this combustion, and with one carbon monoxide as risk material, automatically match the physical and chemical properties of one carbon monoxide, calculate the maximum toxicity concentration and the farthest influence distance, and compare the maximum toxicity concentration with atmospheric toxicity end concentration, if greater than atmospheric toxicity end concentration, then graphic drawing module draws risk influence range chart and is output by output module;If less than atmospheric toxicity end concentration, output module outputs prediction analysis report. Greatly reduce workload and improve work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fire prediction, in particular to a fire environment prediction and analysis system. BACKGROUND

[0002] With the continuous improvement of environmental protection, the accuracy of environmental impact assessment fire accident risk analysis and emergency plan fire accident risk analysis of environmental emergencies is increasingly high, but due to the prediction and analysis involving a large number of parameter values and calculation demonstration, such as boiling point, specific constant pressure heat capacity, and vaporization heat, which need to be analyzed and calculated according to the characteristics of the material, resulting in a large workload and reducing work efficiency. SUMMARY

[0003] The present application provides a fire environment prediction and analysis system to solve the above technical problems.

[0004] The technical scheme for solving the above technical problems is as follows: a fire environment prediction and analysis system, comprising an input module, a project library module, a control module, a graphic drawing module and an output module;

[0005] The input module is used for inputting the combustion material and environmental parameters for predicting combustion, and the input module is in communication connection with the project library module;

[0006] The project library module pre-stores the projects of the combustion material to be predicted and analyzed, and the project library module matches the combustion parameters and environmental parameters corresponding to the combustion material to be predicted and analyzed, and the project library module is in communication connection with the calculation module;

[0007] The calculation module is in communication connection with the graphic drawing module, and the graphic drawing module is in communication connection with the output module, the calculation module calculates the carbon monoxide production, flame height and emission rate generated after the combustion of the combustion material by a preset formula, takes carbon monoxide as a risk substance, automatically matches the physical and chemical properties of carbon monoxide, calculates the maximum toxicity concentration and the farthest influence distance, compares the maximum toxicity concentration with the atmospheric toxicity end concentration, if the maximum toxicity concentration is greater than the atmospheric toxicity end concentration, the graphic drawing module draws a risk influence range map according to the farthest influence distance and outputs through the output module; if the maximum toxicity concentration is less than the atmospheric toxicity end concentration, the graphic drawing module does not need to draw, and the output module outputs a prediction and analysis report.

[0008] On the basis of the above technical scheme, the above technical scheme can be improved as follows:

[0009] Further, the environmental parameters include environmental temperature, liquid pool area and predicted extinguishing time.

[0010] Further, the combustion parameters include combustion heat, specific heat at constant pressure, boiling point and heat of vaporization.

[0011] Further, the pre-stored items in the item library module include item name, item boundary and risk source point.

[0012] Further, the preset formula includes sulfur dioxide emission rate kg / h: G 二氧化硫 = 2BS, B - substance combustion amount, kg / h; S - sulfur content in the substance, %.

[0013] Further, the preset formula also includes carbon monoxide production amount kg / s: G 一氧化碳 = 2330qCQ, C - carbon content in the substance, take 85%; q - chemical incomplete combustion value, take 1.5% - 6.0%; Q - substance amount participating in combustion, t / s.

[0014] Further, the preset formula also includes smoke plume stability index Ri:

[0015] Further, the physical and chemical properties of carbon monoxide include molecular weight, boiling point, density, saturated vapor pressure and toxic concentration.

[0016] The beneficial effects of the present application are: by organically integrating the amount of risk substances participating in combustion, the amount of carbon monoxide accompanying fire accidents, flame height and other parameters, automatic recognition and matching of other required parameters are realized through input of a small amount of parameters, and fire accident risk prediction analysis and risk influence range drawing are simultaneously completed, thereby achieving the purposes of greatly reducing workload and improving work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The figure is a block diagram of the prediction analysis system of the present application.

[0018] The reference signs are recorded as follows: 1, input module; 2, item library module; 3, calculation module; 4, figure drawing module; 5, output module. DETAILED DESCRIPTION

[0019] The principles and characteristics of the present application are described below in combination with the drawings, and the examples are only used to explain the present application, and are not used to limit the scope of the present application.

[0020] As Figure 1 shown, the present application discloses a fire environment prediction analysis system, which comprises an input module 1, an item library module 2, a control module, a figure drawing module 4 and an output module 5.

[0021] The input module 1 is used to input the predicted combustion material and environmental parameters, and the combustion material is carbon monoxide or sulfur dioxide. The input module 1 is in communication connection with the project library module 2. The environmental parameters include environmental temperature, liquid pool area and predicted extinguishing time. The environmental temperature affects the ignition rate and combustion efficiency of the combustible material. In a high-temperature environment, the combustible material is more likely to reach the ignition point, and the fire spreads faster. The environmental temperature also affects the effect of the extinguishing agent. For example, high temperature may accelerate the evaporation of water, reducing its cooling effect. In a fire involving flammable liquids, the size of the liquid pool area determines the size of the fire and the range of heat radiation. A larger liquid pool area will result in a higher heat release rate and larger flames, which increases the difficulty of extinguishing the fire. The liquid pool area also affects the distribution and amount of extinguishing agent needed to cover the entire fire source.

[0022] The project library module 2 pre-stores projects that need to be predicted and analyzed for combustion materials. The project library module 2 matches the combustion parameters of the predicted combustion material with environmental parameters. Different substances have different property parameters, such as specific heat capacity at constant pressure, heat of vaporization, etc., under different environmental parameters (such as temperature). The different parameters need to be matched and brought into the formula for calculation. The project library module 2 is in communication connection with the calculation module 3. The combustion parameters include combustion heat, specific heat capacity at constant pressure, boiling point and heat of vaporization. Combustion heat refers to the energy released when 1 mole of a substance is completely burned to form a stable oxide under standard conditions (usually 25℃ and 1 atm). Specific heat capacity at constant pressure refers to the heat absorbed by unit mass of a substance when its temperature rises by 1K under constant pressure. Heat of vaporization refers to the heat required to convert unit mass of a liquid into a gas under constant temperature and pressure.

[0023] The project includes project name, project boundary and risk source point. The project boundary includes geographical boundary, i.e. project area boundary, which is used to compare whether the fire risk prediction affects the environment and sensitive targets outside the project area.

[0024] The risk source point includes technical risk, economic risk, human resource risk and external environmental risk. The technical risk includes sensor failure, data transmission interruption and algorithm failure. The economic risk includes project overspending and fund chain rupture. The human resource risk includes key personnel resignation and team skill deficiency. The external environmental risk includes natural disasters.

[0025] The calculation module 3 is in communication connection with the graphic drawing module 4, the graphic drawing module 4 is in communication connection with the output module 5, the calculation module 3 obtains the carbon monoxide production amount, the flame height h and the emission rate after the combustion of the combustible by a preset formula, in the embodiment, taking carbon monoxide as the risk substance, automatically matching the physical and chemical properties of carbon monoxide, wherein the physical and chemical properties of carbon monoxide include molecular weight, boiling point, density, saturated vapor pressure and toxic concentration, by bringing the above parameters and the stability index Ri of the smoke plume into the State Environmental Protection Key Laboratory of Numerical Simulation for Environmental Impact Assessment (SLAB) or AFTOX model, wherein the AFTOX (Air Force TOXicant) model is a computer simulation tool for evaluating the environmental impact of atmospheric pollutant emission, the maximum toxic concentration and the farthest influence distance are calculated, and the maximum toxic concentration is compared with the atmospheric toxic end concentration. If greater than the atmospheric toxic end concentration, the graphic drawing module 4 draws a risk influence range map according to the farthest influence distance and outputs through the output module 5; if less than the atmospheric toxic end concentration, the graphic drawing module 4 does not need to draw, the output module 5 outputs a prediction analysis report, the prediction analysis report includes risk level, process risk identification, risk substance identification and risk prediction result, etc., and the risk influence range map is one part of the prediction analysis report. Wherein, the atmospheric toxic end concentration refers to the atmospheric pollutant concentration that personnel short-term exposure may cause health effects or death, the atmospheric toxic end concentration is set based on the research on the acute toxicity of pollutants, to determine a threshold, below which the exposed population will not suffer irreversible health damage or life-threatening in a short time (generally 1 hour).

[0026] Suppose the liquid pool is circular, the calculation formula of the flame height h is: Wherein, r-liquid pool radius; dm / dt-unit surface burning rate, kg / (m 2 .s); p0-air density; kg / m3; g-gravitational acceleration, m / s3 。

[0027] Wherein,

[0028] Hc-liquid combustion heat, J / kg; Cp-specific heat capacity at constant pressure of liquid, J / (kg.k); Tb-boiling point of liquid, K; T0-environmental temperature, K; Hvap-vaporization heat of liquid, J / kg.

[0029] wherein, when the burning substance is sulfur dioxide, the preset formula includes the sulfur dioxide emission rate kg / h: G 二氧化硫 = 2BS, B - the amount of substance burned, kg / h; S - the sulfur content in the substance, %. The sulfur content in the substance is calculated according to the amount of substance of the molecular formula.

[0030] When the burning substance is carbon monoxide, the preset formula includes the carbon monoxide generation amount kg / s: G 一氧化碳 = 2330qCQ, C - the carbon content in the substance, taken as 85%; q - the chemical incomplete combustion value, taken as 1.5% - 6.0%; Q - the amount of substance involved in combustion, t / s.

[0031] The preset formula also includes the stability index of the smoke plume Ri: It is a parameter for measuring the stability of the smoke plume relative to the surrounding environment. When Ri is larger, it means that the smoke plume is relatively unstable and is easily affected by turbulence and dispersed; on the contrary, when Ri is smaller, it means that the smoke plume is relatively stable and is not easily affected by turbulence.

[0032] Determining whether it is continuous emission or instantaneous emission can be determined by comparing the emission time Td and the time T of the pollutant reaching the nearest receptor point (grid point or sensitive point).

[0033] T = 2X / Ur

[0034] Wherein, X - the distance between the accident site and the calculation point, m;

[0035] Ur - wind speed at 10 m high, m / s. It is assumed that the wind speed and direction remain unchanged within the T time period. When Td > T, it is considered to be continuous emission; when Td ≤ T, it can be considered to be instantaneous emission.

[0036] When continuous emission:

[0037] When instantaneous emission:

[0038] Wherein: p rel - the initial density of the emitted substance entering the atmosphere, kg / m 3 ;

[0039] p a - the density of the ambient air, kg / m 3 ;

[0040] Q - the emission rate of the continuous emission plume, kg / s;

[0041] Qt - the mass of the substance emitted instantaneously, kg;

[0042] Drel - the initial width of the smoke plume, i.e. the source diameter, m;

[0043] Ur-10 m height wind speed, m / s.

[0044] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fire environment prediction analysis system, characterized by, The system comprises an input module, a project library module, a control module, a graphic drawing module and an output module; The input module is used for inputting the combustible and environmental parameters, and is in communication connection with the project library module; The project library module pre-stores the projects to be predicted and analyzed, matches the combustion parameters of the combustible with the environmental parameters, and is in communication connection with the calculation module; The calculation module is in communication connection with the graphic drawing module, and the graphic drawing module is in communication connection with the output module.

2. The fire environment prediction analysis system of claim 1, wherein, The calculation module calculates the carbon monoxide production, flame height and emission rate of the combustible by a preset formula, takes the carbon monoxide as a risk substance, automatically matches the physical and chemical properties of the carbon monoxide, calculates the maximum toxic concentration and the farthest influence distance, compares the maximum toxic concentration with the atmospheric toxic end concentration, and if the maximum toxic concentration is greater than the atmospheric toxic end concentration, the graphic drawing module draws a risk influence range map according to the farthest influence distance and outputs the map through the output module; if the maximum toxic concentration is less than the atmospheric toxic end concentration, the graphic drawing module does not need to draw, and the output module outputs a prediction analysis report.

3. The fire environment prediction analysis system of claim 1, wherein, The environmental parameters include environmental temperature, liquid pool area and predicted extinguishing time.

4. The fire environment prediction analysis system of claim 1, wherein, The combustion parameters include combustion heat, specific heat capacity at constant pressure, boiling point and heat of vaporization.

5. The fire environment prediction analysis system of claim 1, wherein, The preset formula includes sulfur dioxide emission rate kg / h: G 二氧化硫 = 2BS, B - the amount of substance combustion, kg / h; S - the content of sulfur in the substance, %.

6. The fire environment prediction analysis system of claim 1, wherein, The preset formula further includes carbon monoxide generation amount kg / s: G 一氧化碳 =2330qCQ,C—content of carbon in the substance, taken as 85%; q—chemical incomplete combustion value, taken as 1.5%—6.0%; Q—mass of the substance participating in combustion, t / s.

7. The fire environment prediction analysis system of claim 6, wherein, The preset formula further comprises a stability index Ri of the smoke cluster: .

8. The fire environment prediction analysis system of claim 1, wherein, The pre-stored projects in the project library module include project name, project boundary and risk source point. The physical and chemical properties of the carbon monoxide include molecular weight, boiling point, density, saturated vapor pressure and toxic concentration.

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