Pyrolysis Modeling and Kinetic Study of Typical Insulation Materials for Building Exterior Envelopes
Thermal insulation materials are important for building energy conservation, but the inherent combustibility of these materials increases the fire risk of building facades. To better understand the fire behaviors of these materials, the study of the kinetics of thermal insulation pyrolysis is partic...
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MDPI AG
2024-12-01
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| author | Youchao Zhang Bo Wang Li Xu Zhiming Ma |
| author_facet | Youchao Zhang Bo Wang Li Xu Zhiming Ma |
| author_sort | Youchao Zhang |
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| description | Thermal insulation materials are important for building energy conservation, but the inherent combustibility of these materials increases the fire risk of building facades. To better understand the fire behaviors of these materials, the study of the kinetics of thermal insulation pyrolysis is particularly important because it is the initial step in ignition and combustion during fire. In this paper, the pyrolysis behavior of expanded polystyrene (EPS), a typical non-charring insulation polymer, has been investigated by thermogravimetric analysis at five different heating rates. The model-free kinetic analysis showed that the obtained average values for E and lnA were 151.23 kJ/mol and 21.29 ln/s, respectively. Model-fitting CR and masterplot methods indicated that f(α) = [2(1-α)[-ln(1-α)]]<sup>1/2</sup> is considered the pyrolysis reaction mechanism of EPS degradation. Based on these results, the equation of the kinetic compensation effect was further developed as lnA = −3.1955 + 0.1736 E<sub>α</sub>. Finally, the reaction model was reconstructed with the result of the expression <i>f</i>(α) = 3.95335α<sup>0.24174</sup> (1-α) [-ln(1-α)]<sup>1.64712</sup>. In addition, PY-GC-MS experiments were conducted to analyze the composition of EPS pyrolysis volatiles. The results showed that the products were mainly compounds of benzene, naphthalene, and biphenyl. The analysis of EPS pyrolysis behavior and evolved gas provides numerical guidance for the future treatment and fire protection of insulation materials. |
| format | Article |
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| institution | OA Journals |
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| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-9701edbf9cfc4ed18b2c6f891e78151f2025-08-20T02:00:18ZengMDPI AGBuildings2075-53092024-12-011412395610.3390/buildings14123956Pyrolysis Modeling and Kinetic Study of Typical Insulation Materials for Building Exterior EnvelopesYouchao Zhang0Bo Wang1Li Xu2Zhiming Ma3College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Architectural Science and Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Architectural Science and Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Architectural Science and Engineering, Yangzhou University, Yangzhou 225127, ChinaThermal insulation materials are important for building energy conservation, but the inherent combustibility of these materials increases the fire risk of building facades. To better understand the fire behaviors of these materials, the study of the kinetics of thermal insulation pyrolysis is particularly important because it is the initial step in ignition and combustion during fire. In this paper, the pyrolysis behavior of expanded polystyrene (EPS), a typical non-charring insulation polymer, has been investigated by thermogravimetric analysis at five different heating rates. The model-free kinetic analysis showed that the obtained average values for E and lnA were 151.23 kJ/mol and 21.29 ln/s, respectively. Model-fitting CR and masterplot methods indicated that f(α) = [2(1-α)[-ln(1-α)]]<sup>1/2</sup> is considered the pyrolysis reaction mechanism of EPS degradation. Based on these results, the equation of the kinetic compensation effect was further developed as lnA = −3.1955 + 0.1736 E<sub>α</sub>. Finally, the reaction model was reconstructed with the result of the expression <i>f</i>(α) = 3.95335α<sup>0.24174</sup> (1-α) [-ln(1-α)]<sup>1.64712</sup>. In addition, PY-GC-MS experiments were conducted to analyze the composition of EPS pyrolysis volatiles. The results showed that the products were mainly compounds of benzene, naphthalene, and biphenyl. The analysis of EPS pyrolysis behavior and evolved gas provides numerical guidance for the future treatment and fire protection of insulation materials.https://www.mdpi.com/2075-5309/14/12/3956pyrolysis behaviorkinetic triplesmodel reconstructionPY-GC-MS |
| spellingShingle | Youchao Zhang Bo Wang Li Xu Zhiming Ma Pyrolysis Modeling and Kinetic Study of Typical Insulation Materials for Building Exterior Envelopes Buildings pyrolysis behavior kinetic triples model reconstruction PY-GC-MS |
| title | Pyrolysis Modeling and Kinetic Study of Typical Insulation Materials for Building Exterior Envelopes |
| title_full | Pyrolysis Modeling and Kinetic Study of Typical Insulation Materials for Building Exterior Envelopes |
| title_fullStr | Pyrolysis Modeling and Kinetic Study of Typical Insulation Materials for Building Exterior Envelopes |
| title_full_unstemmed | Pyrolysis Modeling and Kinetic Study of Typical Insulation Materials for Building Exterior Envelopes |
| title_short | Pyrolysis Modeling and Kinetic Study of Typical Insulation Materials for Building Exterior Envelopes |
| title_sort | pyrolysis modeling and kinetic study of typical insulation materials for building exterior envelopes |
| topic | pyrolysis behavior kinetic triples model reconstruction PY-GC-MS |
| url | https://www.mdpi.com/2075-5309/14/12/3956 |
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