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2023 Vol.19, Issue 2 Preview Page

Original Article

Experimental Study on Autoignition of Superabsorbent Polymers

고흡수성 중합물질의 자연발화에 대한 실험적 연구

허종만1ㆍ최재욱2,3*

Jong-Man Heo1, Jae-Wook Choi2,3*

1Graduate Student, Department of Fire Protection Engineering, Pukyong National University, Busan, Republic of Korea
2Emeritus Professor, Pukyong National University, Busan, Republic of Korea
3Head of the Institute, Ulsan Fire Fighting Engineering Inc., Ulsan, Republic of Korea
30 June 2023. pp. 280-291
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Abstract
Purpose: As fire accidents happen at the production and storage sites of superabsorbent polymers for convenience of daily life, an experimental study was conducted to secure basic data to establish practical preventive measures against them. Method: The sample container (20cm width x 20cm length) was made into a rectangular cuboid with the heights of 3cm, 5cm, 7cm, and 14cm, respectively, to allow access to the infinite flat plane. The front and back of the container were covered with a 300-mesh stainless steel mesh for one-dimensional heat transfer. The sample container was placed in the center of the thermostatic bath, which was heated to a predetermined temperature by setting the thermostat program in advance, and it was determined to be ‘ignited’ when the central temperature of the sample rose by more than 20°C above the set temperature, and “unignited” when it was maintained at an approximate value of the set temperature. Result: The critical autoignition temperature was calculated to be 217.5°C when the height of the sample container was 3 cm, 212.5°C when it was 5 cm, 202.5°C when it was 7cm, and 187.5°C when it was 14cm. The ignition induction time to reach the maximum temperature was 34hours for 3cm, 76hours for 5cm, 143hours for 7cm, and 318hours for 14cm. Conclusion: ① As the size of the container increased, the autoignition temperature decreased and the induction time to reach the maximum temperature increased. ② An apparent activation energy was calculated to be 44.92kcal/mol, with a correlation of 96.93%.
Keywords
Superabsorbent Polymers
Autoignition
Activation Energy
Critical Ignition Temperature
Ignition Induction Time
연구목적: 생활의 편의를 위한 고흡수성 중합물질의 생산 및 저장 사업장에서 발화사고가 발생하고 있어 이에 대한 실질적인 예방대책 수립을 위한 기초자료의 확보를 위해 실험적인 연구를 하였다. 연구방법: 시료용기(가로 20cm×세로 20cm) 폭을 각각 3cm, 5cm, 7cm, 14cm의 크기로 입방체 형상으로 하여 무한평판에 접근하도록 하였고, 300mesh의 스테인리스 망으로 전면과 뒷면을 일차원 방향으로 열이 전달되게 하였다. 이 시료용기를 온도제어장치 프로그램을 미리 설정하여 소정의 온도로 가열되도록 한 항온조 중심에 위치시키고 중심온도가 설정온도보다 20°C이상 상승하였을 때를 ｢발화｣로 , 시료의 중심온도가 설정온도의 근사치에 유지되었을 경우를 ｢비발화｣로 판정하였다. 연구결과: 자연발화한계온도는 시료용기 폭이 3cm일 경우 217.5°C, 5cm일 경우 212.5°C, 7cm일 경우 202.5°C, 그리고 14cm일 경우에는 187.5°C로 산출되었다. 최고온도에 도달하는 발화유도시간은 3cm일 경우 약 34시간, 5cm일 경우 약 76시간, 7cm일 경우 약 143시간, 그리고 14cm일 경우 약 318시간으로 나타났다. 결론: ① 용기의 크기가 증가할수록 자연발화온도는 낮아지고, 최고온도에 도달되는 발화유도시간은 길어지는 것으로 나타났다. ② 겉보기활성화에너지는 44.92 [kcal/mol]을 구하였으며, 상관도는 96.93%이었다.
키워드
고흡수성 중합물질
자연발화
활성화에너지
발화한계온도
발화유도시간
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Information
  • Publisher :The Korean Society of Disaster Information
  • Publisher(Ko) :한국재난정보학회
  • Journal Title :Journal of the Society of Disaster Information
  • Journal Title(Ko) :한국재난정보학회논문집
  • Volume : 19
  • No :2
  • Pages :280-291
  • DOI :https://doi.org/10.15683/kosdi.2023.6.30.280
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