An Experimental Analysis of a Nuclear-Grade Cable Based on Fire Combustion Characteristics and Pyrolysis Behavior
Abstract
:1. Introduction
2. Fire Test Analysis Model for Nuclear-Grade Cables
2.1. Structural Characteristics of Nuclear-Grade Cable Structures
2.2. Selection of Nuclear-Grade Cables
2.3. Failure Criteria for Cables
3. Combustion Test for Nuclear-Grade Cables
3.1. Test Program and Samples
3.1.1. Selection of Test Apparatus and Thermal Radiation Flux
3.1.2. Preparation of Test Samples
3.2. Test Results and Discussion
3.2.1. Ignition Time Analysis
3.2.2. Heat Release Rate Analysis
3.2.3. Analysis of the Effective Heat of Combustion
3.2.4. Fire Performance Index Analysis
3.2.5. Evaluation of Cable Fire Hazard
4. Nuclear-Grade Cable Pyrolysis Test Characterization
4.1. Test Protocol and Samples
Test Instrumentation
4.2. Test Protocol and Samples
5. Conclusions
- (1)
- The conclusions from the nuclear-grade cable combustion test and the comparative analysis with a PVC cable are as follows:
- The ignition time of the cable and the magnitude of the applied thermal radiation intensity is closely related to the intensity of thermal radiation. A higher heating rate of the sample surface shortens the time it takes to reach the ignition point. The longer the ignition time, the less likely the material is to ignite, and the less fire-hazardous the material is.
- The intensities of thermal radiation are different, but the overall trends of the curves are similar, and the process of cable heat release rate change can be divided into four stages.
- The greater the intensity of thermal radiation, the higher the effective heat of combustion.
- Under the same test conditions and the same product parameters, the total heat release and the average heat release rate of the PVC cable are much higher than those of the nuclear-grade cable. In terms of the heat release rate peak, the two are closer, with that of the nuclear-grade cables being slightly higher, which suggests that the fire hazard of PVC cables is much greater than that of nuclear-grade cables.
- (2)
- The conclusions from the nuclear-grade cable pyrolysis test are as follows:
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Cable | Cable Temperature Critical Value | Thermal Radiation Flux Critical Value |
---|---|---|
Thermoplastic | 205 °C | 6 kW/m2 |
Crosslinked | 330 °C | 11 kW/m2 |
Cable Samples | Thermal Radiation Intensity (kW/m2) | |||
---|---|---|---|---|
30 | 40 | 50 | 60 | |
01 | 126 s | 67 s | 44 s | 24 s |
Thermal Radiation Intensity (kW/m2) | 30 | 40 | 50 | 60 |
---|---|---|---|---|
Total heat release (MJ/m2) | 31.53 | 40.09 | 46.41 | 63.59 |
Peak heat release (kW/m2) | 123.89 | 149.91 | 170.51 | 197.48 |
Average heat release rate (kW/m2) | 36.23 | 37.69 | 43.01 | 53.24 |
Thermal Radiation Intensity (kW/m2) | 30 | 40 | 50 | 60 |
---|---|---|---|---|
Fire Performance Index | 1.02 | 0.45 | 0.26 | 0.12 |
Thermal Radiation Intensity (kW/m2) | Total Heat Release (kJ) | Peak Heat Release Rate (kW/m2) | Average Heat Release Rate (kW/m2) | |||
---|---|---|---|---|---|---|
PVC Cable | Nuclear-Grade Cable | PVC Cable | Nuclear-Grade Cable | PVC Cable | Nuclear-Grade Cable | |
30 | 128.72 | 31.53 | 127.95 | 123.89 | 77.06 | 36.23 |
40 | 134.88 | 40.09 | 116.51 | 149.91 | 82.37 | 37.69 |
50 | 150.20 | 46.41 | 161.12 | 170.51 | 102.12 | 43.01 |
60 | 181.85 | 63.59 | 188.31 | 197.48 | 119.37 | 53.24 |
Thermal Radiation Intensity (kW/m2) | Effective Heat of Combustion (MJ/kg) | |
---|---|---|
PVC Cable | Nuclear-Grade Cable | |
30 | 9.85 | 9.56 |
40 | 10.97 | 10.82 |
50 | 12.92 | 13.02 |
60 | 14.78 | 14.86 |
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Shi, Q.; Zuo, J.; Song, W.; Jing, F. An Experimental Analysis of a Nuclear-Grade Cable Based on Fire Combustion Characteristics and Pyrolysis Behavior. Fire 2024, 7, 101. https://doi.org/10.3390/fire7030101
Shi Q, Zuo J, Song W, Jing F. An Experimental Analysis of a Nuclear-Grade Cable Based on Fire Combustion Characteristics and Pyrolysis Behavior. Fire. 2024; 7(3):101. https://doi.org/10.3390/fire7030101
Chicago/Turabian StyleShi, Qiang, Jiaxu Zuo, Wei Song, and Fang Jing. 2024. "An Experimental Analysis of a Nuclear-Grade Cable Based on Fire Combustion Characteristics and Pyrolysis Behavior" Fire 7, no. 3: 101. https://doi.org/10.3390/fire7030101
APA StyleShi, Q., Zuo, J., Song, W., & Jing, F. (2024). An Experimental Analysis of a Nuclear-Grade Cable Based on Fire Combustion Characteristics and Pyrolysis Behavior. Fire, 7(3), 101. https://doi.org/10.3390/fire7030101