CN113434807B - Method and system for predicting power of cable combustion fire source - Google Patents
Method and system for predicting power of cable combustion fire source Download PDFInfo
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Abstract
The invention discloses a method and a system for predicting the power of a cable burning fire source, wherein the method comprises the steps of inputting the single-sided heat release rate of a cable and the predicted parameters in the burning process of a transverse multi-layer cable device into a transverse multi-layer cable fire source power model; and outputting the power of the fire source of the transverse multi-layer cable fire. The invention adopts HRRPUA measured by a cone calorimeter experiment as direct input, does not need to calculate the duration of fire at a given position, simultaneously avoids uncertainty introduced in model prediction due to measuring the combustion heat and the carbon yield of the cable, and improves the accuracy of the model to a certain extent. In addition, the improved model can establish the connection between the small-scale cable test data and the large-scale cable fire experiment, and the calculation time cost is saved to a certain extent.
Description
Technical Field
The invention relates to a combustion fire source power prediction technology, in particular to a method and a system for predicting cable combustion fire source power.
Background
In a nuclear power plant fire accident, cables are considered as an important fire source. Cable fire accident conditions, particularly those related to safe reactor shutdowns, are of particular concern to nuclear plant personnel. The power of the fire source at the cable site involved in a nuclear power plant is also a major concern for the nuclear power plant staff. The transverse cable bridge is a common structural form in a nuclear power station, calculates the heat release rate of transverse cable combustion, and has a certain practical value. Currently, a method for calculating the power of a full-scale cable fire disaster fire source is commonly known as a method for predicting a horizontal cable bridge fire (such as The Flame Spread over Horizontal Cable Trays, FLACS-CAT) by using a simple empirical model based on a computational fluid dynamics (Computational Fluid Dynamics, CFD) method. However, simulating cables based on CFD is very time consuming. The method based on the FLACS-CAT model has prediction uncertainty caused by inconsistent cable combustion heat and carbon yield.
Patent document CN104951627a discloses a fire analysis method and system for a transverse multi-layer cable bridge of a nuclear power plant, the method comprising the steps of: acquiring the characteristic information of a fire disaster initial fire source of a transverse multi-layer cable bridge of a nuclear power plant; acquiring the real-time heat release rate of each layer of cable bridge in the fire disaster process according to the characteristic information of an initial fire source, the geometric structure parameters of the transverse multi-layer cable bridge, the longitudinal spreading rate of the cable flame and the characteristic parameters of the cable materials; acquiring fire risk characteristic parameters in a limited space according to the initial fire source characteristic information and the real-time heat release rate of each layer of cable bridge; and comparing the fire risk characteristic parameters with the quantitative indexes, and judging the risk of the fire of the transverse multi-layer cable bridge of the nuclear power plant. The method and the device follow the conservation principle of the nuclear power plant, fully consider the difference between the single cable bridges in the transverse multi-layer cable bridge, have higher analysis accuracy, can more reasonably analyze the fire risk of the transverse multi-layer cable bridge of the nuclear power plant, and provide favorable support for the fireproof design of the cable bridge. But the method can not realize the prediction of the power of the fire source of the full-scale cable fire.
Disclosure of Invention
The invention aims to solve the problem of uncertainty in prediction caused by inconsistent cable combustion heat and carbon yield in the background art, and provides a method and a system for predicting cable combustion fire source power, so as to avoid uncertainty in prediction caused by inconsistent cable combustion heat value and carbon yield.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for predicting power of a cable combustion fire source, including:
inputting the single-area heat release rate of the cable and the predicted parameters in the combustion process of the transverse multi-layer cable device into a transverse multi-layer cable fire disaster fire source power model;
and outputting the power of the fire source of the transverse multi-layer cable fire.
Further, the cable single-area heat release rate is obtained by:
and (5) carrying out combustion test on the cable by using a cone calorimeter to obtain the single-area heat release rate.
Further, the parameters in the combustion process of the transverse multi-layer cable device include:
the number of cables in each layer of tray of the cable bridge is n; diameter of cable D cab The method comprises the steps of carrying out a first treatment on the surface of the Vertical distance between two layers of electric cables, h i The method comprises the steps of carrying out a first treatment on the surface of the Total number of layers of cable, N layer The method comprises the steps of carrying out a first treatment on the surface of the Length of cable i layer burning, L b，i The method comprises the steps of carrying out a first treatment on the surface of the The cone calorimeter measured the heat release rate per unit area under heat flow exposure,
ignition time of the ith layer x, t ignni (x) The method comprises the steps of carrying out a first treatment on the surface of the Longitudinal expansion angle theta in case of cable fire.
Further, the transverse multi-layer cable fire disaster fire source power model is as follows:
wherein ,
n: the number of cables in each layer of tray of the cable bridge;
D cab : the diameter of the cable, m;
N layer for the total number of layers of the cable (N layer ≥1)；
L bni : the burning length of the ith layer of the cable, m;
t ign，i (x) The ignition time of the ith layer x, s.
Further, the calculation formula of the burning length of each layer of cable is as follows:
L b，i+1 ＝L b，i +2h i tanθ
wherein ,
h i -the vertical distance between the two layers of electrical cables, m;
θ—longitudinal spread angle in case of cable fire, °.
In a second aspect, embodiments of the present invention provide a system for predicting power of a cable combustion fire source, comprising:
the input module is used for inputting the single-area heat release rate of the cable and the predicted parameters in the combustion process of the transverse multi-layer cable device;
the model module is used for storing a transverse multi-layer cable fire source power model and calculating the data input by the input module;
and the output module is used for outputting the result calculated by the model module.
Further, the cable single-area heat release rate is obtained by:
and (5) carrying out combustion test on the cable by using a cone calorimeter to obtain the single-area heat release rate.
Further, the parameters in the combustion process of the transverse multi-layer cable device include:
the number of cables in each layer of tray of the cable bridge is n; diameter of cable D cab The method comprises the steps of carrying out a first treatment on the surface of the Vertical distance between two layers of electric cables, h i The method comprises the steps of carrying out a first treatment on the surface of the Total number of layers of cable, N layer The method comprises the steps of carrying out a first treatment on the surface of the Length of cable i layer burning, L b，i The method comprises the steps of carrying out a first treatment on the surface of the The cone calorimeter measured the heat release rate per unit area under heat flow exposure,
ignition time of the ith layer x, t ign，i (x) The method comprises the steps of carrying out a first treatment on the surface of the Longitudinal expansion angle theta in case of cable fire.
Further, the transverse multi-layer cable fire disaster fire source power model is as follows:
wherein ,
n: the number of cables in each layer of tray of the cable bridge;
D cab : the diameter of the cable, m;
N layer for the total number of layers of the cable (N layer ≥1)；
L b，i : the burning length of the ith layer of the cable, m;
y ign，i (x) Ith horizonSetting the ignition time of x and s.
Further, the calculation formula of the burning length of each layer of cable is as follows:
L b，i+1 ＝L b，i +2h i tanθ
wherein ,
h i -the vertical distance between the two layers of electrical cables, m;
θ—longitudinal expansion angle in case of cable fire, °
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts HRRPUA measured by a cone calorimeter experiment as direct input, does not need to calculate the duration of fire at a given position, simultaneously avoids uncertainty introduced in model prediction due to measuring the combustion heat and the carbon yield of the cable, and improves the accuracy of the model to a certain extent. In addition, the improved model can establish the connection between the small-scale cable test data and the large-scale cable fire experiment, and the calculation time cost is saved to a certain extent.
Drawings
FIG. 1 is a flow chart of a method for predicting the power of a cable combustion fire source provided in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a method for predicting the power of a cable combustion fire source provided in embodiment 1 of the invention;
FIG. 3 shows the change in total mass in cone calorimeter versus HRRPUA in an experiment;
FIG. 4 is a comparison of the predicted heat release rate results with the experimental results;
FIG. 5 is a comparison of the heat release rate prediction result of MT-7 with the experimental result;
fig. 6 is a schematic diagram of a system for predicting power of a cable combustion fire source according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the method for predicting the power of a cable combustion fire source provided by the embodiment of the invention mainly comprises the following steps:
101. inputting the single-area heat release rate of the cable and the predicted parameters in the combustion process of the transverse multi-layer cable device into a transverse multi-layer cable fire disaster fire source power model;
102. and outputting the power of the fire source of the transverse multi-layer cable fire.
Specifically, the single-sided heat release rate of the cable is obtained by:
and carrying out a small-scale combustion test on the cable by using a cone calorimeter to obtain the single-area heat release rate.
And the parameters in the combustion process of the transverse multilayer cable device comprise:
the number of cables in each layer of tray of the cable bridge is n; diameter of cable D cab The method comprises the steps of carrying out a first treatment on the surface of the Vertical distance between two layers of electric cables, h i The method comprises the steps of carrying out a first treatment on the surface of the Total number of layers of cable, N layer The method comprises the steps of carrying out a first treatment on the surface of the Length of cable i layer burning, L b，i The method comprises the steps of carrying out a first treatment on the surface of the The cone calorimeter measured the heat release rate per unit area under heat flow exposure,
ignition time of the ith layer x, t ign，i (x) The method comprises the steps of carrying out a first treatment on the surface of the Longitudinal expansion angle theta in case of cable fire.
The transverse multi-layer cable fire disaster fire source power model is as follows:
wherein ,
n: the number of cables in each layer of tray of the cable bridge;
D cab : the diameter of the cable, m;
N layer for the total number of layers of the cable (N layer ≥1)；
L b，i : the burning length of the ith layer of the cable, m;
t ign，i (x) The ignition time of the ith layer x, s.
The calculation formula of the burning length of each layer of cable is as follows:
L b，i+1 ＝L b，i +2h i tanθ
wherein ,
h i -the vertical distance between the two layers of electrical cables, m;
θ—longitudinal spread angle in case of cable fire, °.
According to the scheme, the calculation formula of the burning length of each layer of cable in the calculation formula of the fire source power of the transverse multi-layer cable fire disaster is as follows:
L b，i+1 ＝L b，i +2h i tanθ
wherein ,
h i -the vertical distance between the two layers of electrical cables, m;
θ—longitudinal spread angle in case of cable fire, °.
In conclusion, the invention adopts the heat release rate per unit area measured by the cone calorimeter experiment as the direct input, and avoids the error of estimating the power of the cable burning fire source caused by the measurement uncertainty of the cable burning heat and the carbon production rate. As shown in fig. 2, the method establishes the connection between the small-scale cable test data and the large-scale cable fire experiment, and saves the time cost of high-precision numerical simulation calculation.
The method is further described in connection with an application scenario example:
1. prediction of experimental data based on cable bridge fire
The parameters of the transverse cable multilayer experimental device are as follows: the cable layers arranged transversely are 1m long and 0.3m wide, and the tray can be 3 layers of cables. There is no partition between adjacent cable layers, so that flames can freely propagate up to the cables of the upper layers. The spacing between two adjacent cable layers is 0.15m. The cable was a YZ medium rubber cable with a diameter of 8mm, a mass per unit length of 0.03kg/m and a heat of combustion of 7.52kJ/g. The nominal voltage range of the cable is 300/500V. The input data of the calculation method for predicting the fire source power of the transverse multilayer cable fire disaster shown in the table 1 are obtained through experiments.
Table 1 input parameter values for cone calorimeter experiments
| Total number of layers | Average expansion ratio (m/h) | Combustion length (m) | Ignition time(s) | Diffusion angle (°) |
| Layer 3 | 4.30,4.37,4.49 | 0.55,0.61,0.56 | 17,15,9 | 0 |
Wherein the propagation length of the flame of each layer of cable is basically equal. Therefore, the diffusion angle is selected to be 0 °. The experimental values of the heat release rate per unit area of fire are shown in fig. 3. The calculated and experimental values of the heat release rate in this embodiment are obtained by inputting the above input parameters into the method for predicting the power of the cable burning fire source provided by the present invention, as shown in fig. 4.
2. Prediction based on literature data
Verification of the method was performed based on predicted cable fire HRR data (the experimental project of the endless spin trarack construction FIRE, CHRISTIFIRE) published by the american nuclear management committee nuclear management office (US-NRC). The experimental data selected therein were the flame spread to the end of all cable layers in the experimental series 1, numbered MT-7.
TABLE 2MT-7 scene improvement model input parameter values
The calculated and experimental values of the heat release rate of this embodiment are obtained by inputting the above-mentioned input parameters into the method provided by the present invention, as shown in fig. 5.
Implementation 2:
referring to fig. 6, a system for predicting power of a cable combustion fire source according to the present embodiment includes:
an input module 401 for inputting the cable single-area heat release rate and the predicted parameters in the combustion process of the transverse multi-layer cable device;
the model module 402 is used for storing a transverse multi-layer cable fire source power model and calculating the data input by the input module;
and the output module 403 is configured to output the result calculated by the model module.
Further, the cable single-area heat release rate is obtained by:
and (5) carrying out combustion test on the cable by using a cone calorimeter to obtain the single-area heat release rate.
Further, the parameters in the combustion process of the transverse multi-layer cable device include:
the number of cables in each layer of tray of the cable bridge is n; diameter of cable D cab The method comprises the steps of carrying out a first treatment on the surface of the Vertical distance between two layers of electric cables, h i The method comprises the steps of carrying out a first treatment on the surface of the Total number of layers of cable, N layer The method comprises the steps of carrying out a first treatment on the surface of the Length of cable i layer burning, L b，i The method comprises the steps of carrying out a first treatment on the surface of the The cone calorimeter measured the heat release rate per unit area under heat flow exposure,
ignition time of the ith layer x, t ign，i (x) The method comprises the steps of carrying out a first treatment on the surface of the Longitudinal expansion angle theta in case of cable fire.
Further, the transverse multi-layer cable fire disaster fire source power model is as follows:
wherein ,
n: the number of cables in each layer of tray of the cable bridge;
D cab : the diameter of the cable, m;
N layer for the total number of layers of the cable (N layer ≥1)；
L b，i : the burning length of the ith layer of the cable, m;
t ign，i (x) The ignition time of the ith layer x, s.
Further, the calculation formula of the burning length of each layer of cable is as follows:
L b，i+1 ＝L b，i +2h i tanθ
wherein ,
h i -the vertical distance between the two layers of electrical cables, m;
θ—longitudinal spread angle in case of cable fire, °.
In conclusion, the HRRPUA measured by the cone calorimeter experiment is used as direct input, the fire duration of a given position does not need to be calculated, meanwhile, uncertainty introduced in model prediction due to measurement of the combustion heat and the carbon yield of the cable is avoided, and the accuracy of the model is improved to a certain extent. In addition, the improved model can establish the connection between the small-scale cable test data and the large-scale cable fire experiment, and the calculation time cost is saved to a certain extent.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the appended claims.
Claims (4)
1. A method of predicting power of a cable combustion fire source, comprising:
inputting the single-area heat release rate of the cable and the predicted parameters in the combustion process of the transverse multi-layer cable device into a transverse multi-layer cable fire disaster fire source power model;
outputting the fire source power of the transverse multi-layer cable fire;
the single-sided heat release rate of the cable is obtained by the following method:
performing combustion test on the cable through a cone calorimeter to obtain a single-area heat release rate;
parameters in the combustion process of the transverse multilayer cable device comprise:
the number of cables in each layer of tray of the cable bridge is n; diameter of cable D cab The method comprises the steps of carrying out a first treatment on the surface of the Vertical distance between two layers of electric cables, h i The method comprises the steps of carrying out a first treatment on the surface of the Total number of layers of cable, N layer The method comprises the steps of carrying out a first treatment on the surface of the Length of cable i layer burning, L b,i The method comprises the steps of carrying out a first treatment on the surface of the The cone calorimeter measured the heat release rate per unit area under heat flow exposure,
ignition time of the ith layer x, t ign,i (x) The method comprises the steps of carrying out a first treatment on the surface of the Longitudinal expansion angle theta when cable fires;
the transverse multi-layer cable fire disaster fire source power model is as follows:
wherein ,
n: the number of cables in each layer of tray of the cable bridge;
D cab : the diameter of the cable, m;
N layer for the total number of layers of the cable (N layer ≥1)；
L b,i : the burning length of the ith layer of the cable, m;
t ign,i (x) The ignition time of the ith layer x, s.
2. The method for predicting power of a cable fire source of claim 1 wherein the cable fire length of each layer is calculated as:
L b,i+1 ＝L b,i +2h i tanθ
wherein ,
h i -the vertical distance between the two layers of electrical cables, m;
θ—longitudinal spread angle in case of cable fire, °.
3. A system for predicting power of a cable combustion fire source, comprising:
the input module is used for inputting the single-area heat release rate of the cable and the predicted parameters in the combustion process of the transverse multi-layer cable device;
the model module is used for storing a transverse multi-layer cable fire source power model and calculating the data input by the input module;
the output module is used for outputting the result calculated by the model module;
the single-sided heat release rate of the cable is obtained by the following method:
performing combustion test on the cable through a cone calorimeter to obtain a single-area heat release rate;
parameters in the combustion process of the transverse multilayer cable device comprise:
the number of cables in each layer of tray of the cable bridge is n; diameter of cable D cab The method comprises the steps of carrying out a first treatment on the surface of the Vertical distance between two layers of electric cables, h i The method comprises the steps of carrying out a first treatment on the surface of the Total number of layers of cable, N layer The method comprises the steps of carrying out a first treatment on the surface of the Length of cable i layer burning, L b,i The method comprises the steps of carrying out a first treatment on the surface of the The cone calorimeter measured the heat release rate per unit area under heat flow exposure,
ignition time of the ith layer x, t ign,i (x) The method comprises the steps of carrying out a first treatment on the surface of the Longitudinal expansion angle theta when cable fires;
the transverse multi-layer cable fire disaster fire source power model is as follows:
wherein ,
n: the number of cables in each layer of tray of the cable bridge;
D cab : the diameter of the cable, m;
N layer for the total number of layers of the cable (N layer ≥1)；
L b,i : the burning length of the ith layer of the cable, m;
t ign,i (x) The ignition time of the ith layer x, s.
4. A system for predicting cable fire source power as claimed in claim 3 wherein the cable fire length of each layer is calculated as:
L b,i+1 ＝L b,i +2h i tanθ
wherein ,
h i -the vertical distance between the two layers of electrical cables, m;
θ—longitudinal spread angle in case of cable fire, °.
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