CN104951627B - Nuclear power plant's transverse direction multi-layer cable crane span structure fire disaster analyzing method and system - Google Patents
Nuclear power plant's transverse direction multi-layer cable crane span structure fire disaster analyzing method and system Download PDFInfo
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Abstract
The present invention relates to a kind of nuclear power plant's transverse direction multi-layer cable crane span structure fire risk analysis method and systems, and this method comprises the following steps：Obtain the initial burning things which may cause a fire disaster characteristic information of nuclear power plant's transverse direction multi-layer cable crane span structure fire；According to initial burning things which may cause a fire disaster characteristic information, the characteristic parameter of the geometrical structure parameter of lateral multi-layer cable crane span structure, cable flame longitudinal direction rate of spread and cable material, the real-time heat release rate of each layer cable testing bridge in fire process is obtained；According to the real-time heat release rate of initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge, the fire risk characteristic parameter in restricted clearance is obtained；Fire risk characteristic parameter is compared with quantizating index, the risk of judgement nuclear power plant transverse direction multi-layer cable crane span structure fire.The present invention follows the conservatism of nuclear power plant, fully consider the difference between individual cable crane span structure inside lateral multi-layer cable crane span structure, its accuracy of analysis higher can more reasonably analyze nuclear power plant's transverse direction multi-layer cable crane span structure fire risk, beneficial support is provided for the fire protection design of cable testing bridge.
Description
Technical field
The present invention relates to design of nuclear power plant fields, more particularly to a kind of nuclear power plant's transverse direction multi-layer cable crane span structure fire disaster analyzing
Method and system.
Background technology
With Re-search on Urbanization, the development of modernization, it is contemplated that the year two thousand thirty Analyzing Total Electricity Consumption will be doubled than now.Cause
This, will realize the carbon emission index before the year two thousand thirty, it is necessary to greatly develop the low-carbon clean energy resource including nuclear power.To 2020
Year, Chinese Nuclear Power installed capacity reaches 58,000,000 kilowatts, reaches 30,000,000 kilowatts or more building capacity.However, safety and warp
Ji property is to restrict two principal elements of nuclear power developing.
It is counted according to American Electric Power research institute (Electric Power Research Institute), 1991 extremely
2008 Nian Jian nuclear power plants fire occurrence frequencies are 0.14 time/heap year, in French EDF event databases with the relevant event of fire
For 2204 (1975-1995), fire incident is one of most important threat of nuclear safety.Cable is the most universal in nuclear power plant
One of combustible, Browns Ferry nuclear power plants of the U.S. in 1975 lead to No. 1 heap Emergency Cooling System failure because cable is on fire,
Economic loss is heavy, and directly threatens nuclear safety.
For nuclear power fire depth defense principle, traditional fire-fighting scheme does not have flexibility and specific aim.In this regard, the U.S.
Fire Protection Association promulgates《NFPA-805》, it is put forward for the first time and performance-based fire standard is applied in the design for fire protection of light water reactor.It is beautiful
The report of state's Nuclear Management Committee publication《NUREG-1824》In, regional model software is examined and verified, is as a result shown
Show most of regional model software prediction result all within the range of indeterminacy of experimental result.Therefore, in nuclear safety principle
Under the premise of, quantitative fire risk analysis and assessment are carried out based on performance-based principle, it can be in safety, economy and specific aim
On greatly improve.
For in the regional model simulation of nuclear power plant's transverse direction multi-layer cable crane span structure fire, the setting of burning things which may cause a fire disaster is one prodigious
Challenge.Currently, universal processing method is that lateral multi-layer cable crane span structure is regarded as a whole burning things which may cause a fire disaster, lateral multilayer electricity is ignored
The difference burnt between individual cable crane span structure inside cable crane span structure, the excessively high oxygen for having evaluated the consumption of Initial Stage of Fire cable fire
Amount, leads to the result of calculation of mistake.Therefore, based on such method carry out lateral multi-layer cable crane span structure fire risk analysis be also
Unreasonable.
Invention content
Based on this, to solve problems of the prior art, the present invention provides a kind of nuclear power plant's transverse direction multi-layer cable bridge
Frame fire disaster analyzing method and system, under the premise of nuclear power plant's conservatism, more rationally and accurately assessment nuclear power plant is lateral
Multi-layer cable crane span structure fire risk.
To realize the above-mentioned technical purpose, the embodiment of the present invention adopts the following technical scheme that：
A kind of nuclear power plant's transverse direction multi-layer cable crane span structure fire risk analysis method, includes the following steps：
Obtain the initial burning things which may cause a fire disaster characteristic information of nuclear power plant's transverse direction multi-layer cable crane span structure fire；
It is longitudinal according to the initial burning things which may cause a fire disaster characteristic information, the geometrical structure parameter of lateral multi-layer cable crane span structure, cable flame
The characteristic parameter of rate of spread and cable material obtains each layer cable bridge in nuclear power plant's transverse direction multi-layer cable crane span structure fire process
The real-time heat release rate of frame；
According to the real-time heat release rate of the initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge, restricted clearance is obtained
Interior fire risk characteristic parameter；
The fire risk characteristic parameter is compared with quantizating index, judgement nuclear power plant transverse direction multi-layer cable crane span structure fire
The risk of calamity.
And a kind of nuclear power plant's transverse direction multi-layer cable crane span structure fire risk analysis system, including：
Acquisition module, for obtaining the initial burning things which may cause a fire disaster characteristic information of nuclear power plant's transverse direction multi-layer cable crane span structure fire；
Layered method module, for the geometry according to the initial burning things which may cause a fire disaster characteristic information, lateral multi-layer cable crane span structure
The characteristic parameter of parameter, cable flame longitudinal direction rate of spread and cable material obtains nuclear power plant's transverse direction multi-layer cable crane span structure fire
The real-time heat release rate of each layer cable testing bridge during calamity；
Analog module, for the real-time heat release speed according to the initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge
Rate obtains the fire risk characteristic parameter in restricted clearance；
Risk determination module judges nuclear power plant for comparing the fire risk characteristic parameter with quantizating index
The risk of lateral multi-layer cable crane span structure fire.
The present invention follows the conservatism of nuclear power plant, in the fire risk of analysis nuclear power plant transverse direction multi-layer cable crane span structure and right
When it is transformed, considers the difference burnt between individual cable crane span structure inside lateral multi-layer cable crane span structure, obtain cable respectively
The real-time heat release rate of each layer cable testing bridge in crane span structure fire process, relative in traditional technology by lateral multi-layer cable crane span structure
It is regarded as the method that a whole burning things which may cause a fire disaster is analyzed, accuracy higher can more reasonably analyze nuclear power plant's transverse direction multi-layer cable
Crane span structure fire risk, the fire protection design for cable testing bridge fire provide beneficial support, ensure the safety of nuclear power plant, improve nuclear power
The economy of construction.
Description of the drawings
Fig. 1 shows for a kind of flow of nuclear power plant's transverse direction multi-layer cable crane span structure fire risk analysis method in the embodiment of the present invention
It is intended to；
Fig. 2 is a kind of flow diagram of the calculation procedure of the real-time heat release rate provided in the embodiment of the present invention；
Fig. 3 is the schematic diagram for simulating lateral multi-layer cable crane span structure fire development process in the embodiment of the present invention by CFAST；
Fig. 4 shows for a kind of structure of nuclear power plant's transverse direction multi-layer cable crane span structure fire risk analysis system in the embodiment of the present invention
It is intended to.
Specific implementation mode
Present disclosure is described in further detail with reference to preferred embodiment.
As shown in Figure 1, providing a kind of nuclear power plant's transverse direction multi-layer cable crane span structure fire risk analysis method in the present embodiment, wrap
Include following steps：
S10 obtains the initial burning things which may cause a fire disaster characteristic information of nuclear power plant's transverse direction multi-layer cable crane span structure fire；
S20 is vertical according to the initial burning things which may cause a fire disaster characteristic information, the geometrical structure parameter of lateral multi-layer cable crane span structure, cable flame
To rate of spread and the characteristic parameter of cable material, each layer cable in nuclear power plant's transverse direction multi-layer cable crane span structure fire process is obtained
The real-time heat release rate of crane span structure；
S30 is obtained limited according to the real-time heat release rate of the initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge
Fire risk characteristic parameter in space；
S40 compares the fire risk characteristic parameter with quantizating index, judgement nuclear power plant transverse direction multi-layer cable bridge
The risk of frame fire.
In a specific embodiment, the initial burning things which may cause a fire disaster characteristic information of nuclear power plant's transverse direction multi-layer cable crane span structure fire includes initial
The area of burning things which may cause a fire disaster, the position of initial burning things which may cause a fire disaster, initial burning things which may cause a fire disaster duration and initial fire source power.The initial burning things which may cause a fire disaster characteristic information
It is obtained according to relevant criterion, for example, being entrusted according to American Electric Power research institute (Electric Power Institute) and core management
The NUREG/CR-6850 that member's meeting (Nuclear Regulatory Commission) is promulgated《Fire PRA Methodology
for Nuclear Power Facilities》, the area of the initial burning things which may cause a fire disaster of lateral multi-layer cable crane span structure fire is electricity in nuclear power plant
Square of cable crane span structure width is located at the first layer center of lateral multi-layer cable crane span structure.
It, can be according to the initial burning things which may cause a fire disaster characteristic information, lateral multi-layer cable crane span structure after obtaining initial burning things which may cause a fire disaster characteristic information
Geometrical structure parameter (including the ginsengs such as quantity at interval, cable testing bridge inner cable between cable testing bridge width, each layer cable testing bridge
Number), the characteristic parameter of cable flame longitudinal direction rate of spread and cable material (including the lateral rate of propagation of cable fire, unit plane
The product heat release rate of cable, unit area combustible mass, cable fire heat, the mass fraction of combustible material, coke rate etc.
Common attribute parameter), obtain the real-time heat release speed of each layer cable testing bridge in nuclear power plant's transverse direction multi-layer cable crane span structure fire process
Rate.In a specific embodiment, it can be calculated by the following formula：
L1(t)=V0·t (1)
Li+1(t)=Li(t)+2hitan(35°) (2)
Ai(t)=WLi(t) (3)
Wherein, t is the time；Li(t) it is the cable length to burn in i layers of cable testing bridge；I be cable floor (i=1,
2...)；V0For the lateral rate of propagation of cable fire；hiFor the interval between i layers and i+1 layers of cable testing bridge；W is cable testing bridge width；
Ai(t) it is the area that catches fire in i layers of cable testing bridge；For the heat release rate of unit area cable；For i layers of cable testing bridge
Heat release rate；Δ t is the cable fire duration；m″cFor unit area combustible mass；Δ H is cable fire heat；N is
The quantity of cable testing bridge inner cable；YpFor the mass fraction of combustible material；υ is coke rate；M ' is the quality of unit cable length.
And according to NUREG/CR-6850《Fire PRA Methodology for Nuclear Power
Facilities》, for cable flame longitudinal direction rate of spread, can make to simplify setting as follows：First layer cable flame ignition second
The time of cable in layer crane span structure was first layer cable fire after 240 seconds；In second layer cable flame ignition third layer crane span structure
The time of cable was second layer cable fire after 180 seconds；The time of cable in the 4th layer of crane span structure of third layer cable flame ignition
After third layer cable fire 120 seconds；The time of cable in 4th layer of cable flame ignition layer 5 crane span structure is the 4th layer of electricity
After cable burns 60 seconds；After flame propagation to layer 5, flame is divided into 60 seconds between the propagation time between cable testing bridge.
According to above-mentioned formula (1) to formula (6), in conjunction in NUREG/CR-6850 for cable flame longitudinal direction rate of spread
Simplify setting, nuclear power plant's transverse direction multi-layer cable crane span structure can be calculated by calculation procedure (such as calculation procedure shown in Fig. 2)
The real-time heat release rate of each layer cable testing bridge in fire process, then according to the real-time heat release rate of each layer cable testing bridge,
The fire risk characteristic parameter in restricted clearance is obtained by simulation softward emulation or other modes.
In a specific embodiment, dual-stage model software CFAST (Consolidate are used in the present embodiment
Fire And Smoke Transport) simulate lateral multi-layer cable crane span structure fire development process.It, will be first with reference to shown in Fig. 3
The real-time heat release rate of beginning burning things which may cause a fire disaster characteristic information and each layer cable testing bridge imports the input text of dual-stage model software CFAST
Part, the burning things which may cause a fire disaster feature calculated as dual-stage model.By dual-stage model software CFAST, in quantum chemical method restricted clearance
Fire risk characteristic parameter.In a specific embodiment, fire risk characteristic parameter includes heat release rate, hot cigarette
The parameters such as the temperature of gas-bearing formation, smoke layer height, object temperature variation, heat flux suffered by object.Pass through preset amount
Change index, every fire risk characteristic parameter is compared with corresponding quantizating index, to judge nuclear power plant's transverse direction multilayer
The risk of cable testing bridge fire.
When carrying out fire risk analysis to nuclear power plant, for the regional model of nuclear power plant's transverse direction multi-layer cable crane span structure fire
In simulation, the setting of burning things which may cause a fire disaster is a prodigious challenge.The present invention follows the conservatism of nuclear power plant, for being incited somebody to action in traditional technology
Lateral multi-layer cable crane span structure is regarded as the method that a whole burning things which may cause a fire disaster is analyzed, in analysis nuclear power plant transverse direction multi-layer cable crane span structure
Fire risk and when carrying out fire protection design to it, considers the difference between individual cable crane span structure inside lateral multi-layer cable crane span structure,
The real-time heat release rate of each layer cable testing bridge in cable testing bridge fire process is obtained respectively, and accuracy higher can more rationally
Nuclear power plant's transverse direction multi-layer cable crane span structure fire risk is analyzed on ground, and beneficial support is provided for the fire protection design of cable testing bridge fire, is protected
The safety for hindering nuclear power plant, improves the economy of nuclear power plant construction.
The present invention also provides a kind of nuclear power plant's transverse direction multi-layer cable crane span structure fire risk analysis systems, and the analysis is given below
One specific embodiment of system.
As shown in figure 4, nuclear power plant's transverse direction multi-layer cable crane span structure fire risk analysis system in the present embodiment includes：
Acquisition module 10, for obtaining the initial burning things which may cause a fire disaster characteristic information of nuclear power plant's transverse direction multi-layer cable crane span structure fire；
Layered method module 20, for the geometry knot according to the initial burning things which may cause a fire disaster characteristic information, lateral multi-layer cable crane span structure
The characteristic parameter of structure parameter, cable flame longitudinal direction rate of spread and cable material obtains nuclear power plant's transverse direction multi-layer cable crane span structure
The real-time heat release rate of each layer cable testing bridge in fire process；
Analog module 30, for the real-time heat release speed according to the initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge
Rate obtains the fire risk characteristic parameter in restricted clearance；
Risk determination module 40 judges nuclear power for comparing the fire risk characteristic parameter with quantizating index
The risk of factory's transverse direction multi-layer cable crane span structure fire.
In a specific embodiment, the initial burning things which may cause a fire disaster characteristic information of nuclear power plant's transverse direction multi-layer cable crane span structure fire includes initial
The area of burning things which may cause a fire disaster, the position of initial burning things which may cause a fire disaster, initial burning things which may cause a fire disaster duration and initial fire source power.The initial burning things which may cause a fire disaster characteristic information
It is obtained according to relevant criterion, for example, being entrusted according to American Electric Power research institute (Electric Power Institute) and core management
The NUREG/CR-6850 that member's meeting (Nuclear Regulatory Commission) is promulgated《Fire PRA Methodology
for Nuclear Power Facilities》, the area of the initial burning things which may cause a fire disaster of lateral multi-layer cable crane span structure fire is electricity in nuclear power plant
Square of cable crane span structure width is located at the first layer center of lateral multi-layer cable crane span structure.
After obtaining initial burning things which may cause a fire disaster characteristic information by acquisition module 10, layered method module 20 is according to initial burning things which may cause a fire disaster feature
Information, lateral multi-layer cable crane span structure geometrical structure parameter (including interval between cable testing bridge width, each layer cable testing bridge,
The quantity of cable testing bridge inner cable etc. information), the characteristic parameter of cable flame longitudinal direction rate of spread and cable material, obtain
The real-time heat release rate of each layer cable testing bridge in nuclear power plant's transverse direction multi-layer cable crane span structure fire process.In a kind of specific embodiment party
In formula, it can be calculated by the following formula：
L1(t)=V0·t (1)
Li+1(t)=Li(t)+2hitan(35°) (2)
Ai(t)=WLi(t) (3)
Wherein, t is the time；Li(t) it is the cable length to burn in i layers of cable testing bridge；I be cable floor (i=1,
2...)；V0For the lateral rate of propagation of cable fire；hiFor the interval between i layers and i+1 layers of cable testing bridge；W is cable testing bridge width；
Ai(t) it is the area that catches fire in i layers of cable testing bridge；For the heat release rate of unit area cable；For i layers of cable testing bridge
Heat release rate；Δ t is the cable fire duration；m″cFor unit area combustible mass；Δ H is cable fire heat；N is
The quantity of cable testing bridge inner cable；YpFor the mass fraction of combustible material；υ is coke rate；M ' is the quality of unit cable length.
And according to NUREG/CR-6850《Fire PRA Methodology for Nuclear Power
Facilities》, for cable flame longitudinal direction rate of spread, can make to simplify setting as follows：First layer cable flame ignition second
The time of cable in layer crane span structure was first layer cable fire after 240 seconds；In second layer cable flame ignition third layer crane span structure
The time of cable was second layer cable fire after 180 seconds；The time of cable in the 4th layer of crane span structure of third layer cable flame ignition
After third layer cable fire 120 seconds；The time of cable in 4th layer of cable flame ignition layer 5 crane span structure is the 4th layer of electricity
After cable burns 60 seconds；After flame propagation to layer 5, flame is divided into 60 seconds between the propagation time between cable testing bridge.
According to above-mentioned formula (1) to formula (6), simplifies setting in conjunction in NUREG/CR-6850, calculation procedure can be passed through
The real-time heat release rate for calculating each layer cable testing bridge in nuclear power plant's transverse direction multi-layer cable crane span structure fire process, then passes through mould
Quasi- module 30, according to the fire risk characteristic parameter in the real-time heat release rate computation-bound space of each layer cable testing bridge.
In a specific embodiment, analog module 30 is using dual-stage model software CFAST (Consolidate
Fire And Smoke Transport) simulate lateral multi-layer cable crane span structure fire development process.Analog module 30 is by each layer
The real-time heat release rate of cable testing bridge and initial burning things which may cause a fire disaster characteristic information import the input text of dual-stage model software CFAST
Part, the burning things which may cause a fire disaster feature calculated as dual-stage model.By dual-stage model software CFAST, in quantum chemical method restricted clearance
The fire such as heat release rate, the temperature of hot smoke layer, smoke layer height, object temperature variation, heat flux suffered by object
Calamity feature of risk parameter.
Finally, Risk determination module 40 is by preset quantizating index, every fire that analog module 30 is exported
Feature of risk parameter is compared with corresponding quantizating index, to judge the wind of nuclear power plant's transverse direction multi-layer cable crane span structure fire
Danger.According to risk analysis as a result, technical staff carries out fire protection design to the lateral multi-layer cable crane span structure fire of nuclear power plant, core is ensured
The safety of power plant improves the economy of nuclear power plant construction.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (6)
1. a kind of nuclear power plant's transverse direction multi-layer cable crane span structure fire disaster analyzing method, which is characterized in that include the following steps：
The initial burning things which may cause a fire disaster characteristic information of nuclear power plant's transverse direction multi-layer cable crane span structure fire is obtained, the initial burning things which may cause a fire disaster characteristic information includes just
The area of beginning burning things which may cause a fire disaster, the position of initial burning things which may cause a fire disaster, initial burning things which may cause a fire disaster duration and initial fire source power；
It is longitudinally spread according to the initial burning things which may cause a fire disaster characteristic information, the geometrical structure parameter of lateral multi-layer cable crane span structure, cable flame
The characteristic parameter of rate and cable material obtains each layer cable testing bridge in nuclear power plant's transverse direction multi-layer cable crane span structure fire process
Real-time heat release rate；
According to the real-time heat release rate of the initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge, obtain in restricted clearance
Fire risk characteristic parameter；
The fire risk characteristic parameter is compared with quantizating index, judgement nuclear power plant transverse direction multi-layer cable crane span structure fire
Risk；
It is longitudinally spread according to the initial burning things which may cause a fire disaster characteristic information, the geometrical structure parameter of lateral multi-layer cable crane span structure, cable flame
The characteristic parameter of rate and cable material obtains each layer cable testing bridge in nuclear power plant's transverse direction multi-layer cable crane span structure fire process
When real-time heat release rate, calculated using following formula：
L1(t)=V0·t
Li+1(t)=Li(t)+2hitan(35°)
Ai(t)=WLi(t)
Wherein, t is the time；Li(t) it is the cable length to burn in i layers of cable testing bridge；I is cable floor；V0It is horizontal for cable fire
To rate of propagation；hiFor the interval between i layers and i+1 layers of cable testing bridge；W is cable testing bridge width；Ai(t) it is i layers of cable testing bridge
Inside catch fire area；For the heat release rate of unit area cable；For i layers of cable testing bridge heat release rate；Δ t is electricity
Cable firing duration；m′c' it is unit area combustible mass；Δ H is cable fire heat；N is the number of cable testing bridge inner cable
Amount；YpFor the mass fraction of combustible material；υ is coke rate；M ' is the quality of unit cable length.
2. nuclear power plant's transverse direction multi-layer cable crane span structure fire disaster analyzing method according to claim 1, which is characterized in that according to institute
The real-time heat release rate of initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge is stated, the fire risk obtained in restricted clearance is special
The process of sign parameter includes the following steps：
The real-time heat release rate of the initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge is imported into dual-stage model software
The input file of CFAST, the fire risk characteristic parameter in quantum chemical method restricted clearance.
3. nuclear power plant's transverse direction multi-layer cable crane span structure fire disaster analyzing method according to claim 1 or 2, which is characterized in that institute
Stating fire risk characteristic parameter includes：Heat release rate, the temperature of hot smoke layer, smoke layer height, object temperature become
The heat flux that change and object are subject to.
4. a kind of nuclear power plant's transverse direction multi-layer cable crane span structure fire disaster analyzing system, which is characterized in that including：
Acquisition module, for obtaining the initial burning things which may cause a fire disaster characteristic information of nuclear power plant's transverse direction multi-layer cable crane span structure fire, the initial burning things which may cause a fire disaster
Characteristic information includes the area of initial burning things which may cause a fire disaster, the position of initial burning things which may cause a fire disaster, initial burning things which may cause a fire disaster duration and initial fire source power；
Layered method module, for according to the geometrical structure parameter of the initial burning things which may cause a fire disaster characteristic information, lateral multi-layer cable crane span structure,
The characteristic parameter of cable flame longitudinal direction rate of spread and cable material obtains nuclear power plant's transverse direction multi-layer cable crane span structure fire process
In each layer cable testing bridge real-time heat release rate；
Analog module is obtained for the real-time heat release rate according to the initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge
Take the fire risk characteristic parameter in restricted clearance；
Risk determination module, for comparing the fire risk characteristic parameter with quantizating index, judgement nuclear power plant is lateral
The risk of multi-layer cable crane span structure fire；
The layered method module is joined according to the geometry of the initial burning things which may cause a fire disaster characteristic information, lateral multi-layer cable crane span structure
The characteristic parameter of number, cable flame longitudinal direction rate of spread and cable material obtains nuclear power plant's transverse direction multi-layer cable crane span structure fire mistake
In journey when the real-time heat release rate of each layer cable testing bridge, calculated using following formula：
L1(t)=V0·t
Li+1(t)=Li(t)+2hitan(35°)
Ai(t)=WLi(t)
Wherein, t is the time；Li(t) it is the cable length to burn in i layers of cable testing bridge；I is cable floor；V0It is horizontal for cable fire
To rate of propagation；hiFor the interval between i layers and i+1 layers of cable testing bridge；W is cable testing bridge width；Ai(t) it is i layers of cable testing bridge
Inside catch fire area；For the heat release rate of unit area cable；For i layers of cable testing bridge heat release rate；Δ t is electricity
Cable firing duration；m′c' it is unit area combustible mass；Δ H is cable fire heat；N is the number of cable testing bridge inner cable
Amount；YpFor the mass fraction of combustible material；υ is coke rate；M ' is the quality of unit cable length.
5. nuclear power plant's transverse direction multi-layer cable crane span structure fire disaster analyzing system according to claim 4, which is characterized in that the mould
Quasi- module is soft by the real-time heat release rate of the initial burning things which may cause a fire disaster characteristic information and each layer cable testing bridge importing dual-stage model
The input file of part CFAST, the fire risk characteristic parameter in quantum chemical method restricted clearance.
6. nuclear power plant's transverse direction multi-layer cable crane span structure fire disaster analyzing system according to claim 4 or 5, which is characterized in that institute
Stating fire risk characteristic parameter includes：Heat release rate, the temperature of hot smoke layer, smoke layer height, object temperature become
The heat flux that change and object are subject to.
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| CN106710652B (en) * | 2016-11-01 | 2018-06-29 | 广州中国科学院工业技术研究院 | Fire fire source power monitors system in nuclear power plant's restricted clearance |
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| CN111159960B (en) * | 2019-12-31 | 2023-05-12 | 国网陕西省电力公司西安供电公司 | Numerical simulation method for fire caused by cable fault in tunnel |
| CN113434807B (en) * | 2021-05-20 | 2023-04-28 | 广州中国科学院工业技术研究院 | Method and system for predicting power of cable combustion fire source |
| CN116663910A (en) * | 2023-07-03 | 2023-08-29 | 济南达材信息科技有限公司 | Cable bridge fire risk analysis method and system |
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