Improving the Activation Energy Reliability of Insulating Materials Using Non-Isothermal Thermogravimetric Analysis

Insulation materials are widely used in buildings for energy conservation. However, a combustible insulation material poses a potential risk of rapid flame propagation in the event of a fire. Since ignition occurs through surface pyrolysis before combustion takes place, it is important to understand the pyrolysis process of insulation materials. In this study, thermogravimetric analysis (TGA) was conducted at different heating rates to investigate the pyrolysis of expanded polystyrene (EPS). The results indicate that the pyrolysis of EPS occurs in one stage, with weight loss occurring at temperatures in the range of 370–430 ℃. The pyrolysis kinetics were analyzed using the model-free and model-free method based on TGA results. Kinetic analysis allowed for the determination of pyrolysis parameters such as activation energy, pre-exponential factor, and reaction mechanism of EPS. Furthermore, the suitability of the pyrolysis parameters obtained in this study was examined using a pyrolysis model for fire simulation.

Section: Thermal Property Valueunclassified

Experimental Study on the Surface Pyrolysis Properties and Modeling of Expanded Polystyrene

Ha,

Jeon

2023

“…로 화재모델링 코드 적용지침서(NUREG-1934) (6) 와 화재모델의 검증 및 확인(NUREG-1824) (7) 분석 조건 및 해석방법에 있어 열 . TGA 분해 물성의 정량적인 차이가 있으며 특히 활성화 에너지 산출 , 을 위한 다양한 방법론에 따라 열분해 물성의 정량적인 차이가 크게 발생될 수 있음을 선행연구를 통해 확인 할 수 있다 (15,16) .…”

Section: [Research Paper]unclassified

Measurement of Pyrolysis Properties for Fire Spread Simulation of Cables

Mun¹,

Cho²,

Lee³

et al. 2022

The analysis and review of the thermal decomposition properties required for the fire spread simulation of cables composed of multiple materials were performed. Thus, a typical two-step pyrolysis reaction was identified independent of cable type. It is expected that the Kissinger and flynn–wall–ozawa (FWO) methods, which are calculated using various heating rates, more accurately predict fire spread than the input method that uses the and values calculated using a single heating rate. Consequently, in the case of flame-retardant cables (CLASS 1E and TFR-8), the Kissinger method is more likely to overestimate the fire spread rate than the FWO method. In the case of polyvinyl chloride (PVC) cables (vinyl cabtire power cable, VCTF), the fire spread rate may be underestimated.

Measurement of Pyrolysis Properties for Fire Spread Simulations of Spray Polyurethane Foam

Mun¹,

Lee²,

Hwang³

2022

In this study, measurements and a review of the pyrolysis properties required for fire spread simulations of rigid spray polyurethane foam (SPF) were performed. The change in the mass ratio of the hardener and resin during the foaming of the SPF had little effect on the reference temperature and reaction rate at which the pyrolysis reaction most actively occurred. As the heating rate increased in TGA, a higher pyrolysis reaction rate was predicted. The Kissinger method to calculate the activation energy (Ea) under various heating rates was expected to more accurately predict fire spread phenomena compared to the method that applied Tp and rp measured with a single heating rate. However, the Ea determined by the Kissinger method was similar to the value at a degree of conversion of approximately 30% using the Flynn-Wall-Ozawa method. Consequently, considering the initial fire spread on the SPF surface, the Kissinger method could potentially overestimate the fire spread rate.