Fire Science and Engineering (한국화재소방학회논문지)

Korean Institute of Fire Science and Engineering (한국화재소방학회)
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An Experimental Study on Explosion Hazard of Dry Cleaning Solvent Recovery Machine in Laundry

세탁소 유기용제 회수건조기의 폭발 위험성에 관한 실험적 연구

  • 최정민 (한국화재보험협회 부설 방재시험연구원) ;
  • 손봉세 (가천대학교 소방방재학과) ;
  • 김동석 (한국화재보험협회 부설 방재시험연구원)
  • Received : 2012.12.05
  • Accepted : 2013.02.01
  • Published : 2013.02.28
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Abstract

This study analyzes the explosion hazard of dry cleaning solvent recovery machine in laundry shop in two aspects, i.e. combustible and ignition source, and determines the explosive conditions of this machine by conducting mockup explosion tests repeatedly, varying conditions and using real dry cleaning solvent recovery machines. As to combustibles, two kinds of combustibles used widely in Korea have been selected and tested. The flash points, LEL's, and saturation vapor pressures of those combustibles have been measured, and their explosion specific curves have been drawn, based on the results of the measurements, so that the explosion risks of those materials may be determined, depending on the temperatures. Potential voltages generated from materials for laundry and foreign materials of metals have been assumed to be the ignition sources in this application, and their potential voltages have been measured, depending on temperature, humidity, and antistatic agent, by using real materials for laundry and a potential voltage measuring device. Tests have been conducted, varying the quantities, concentrations, and operating temperatures of materials for laundry. As a result, explosions have not been generated with potential voltages of materials for laundry, but explosions have been observed when applying artificial spark energy of 2.0 mJ.

공중위생관리법 시행규칙에 의해 설치가 의무화된 세탁소 회수건조기의 폭발 위험성을 가연물과 점화원의 두 가지 측면에서 분석하고 실제 현장에 설치되는 유기용제 회수기와 건조기를 사용하여 실물모형 폭발실험을 실시하여 폭발이 발생하는 조건을 확인하였다. 가연물인 세탁용제는 우리나라에서 널리 사용되는 국산 제품 2종으로 선정하여 인화점, 폭발 하한계 및 포화증기압 등의 특성치를 실험을 통해 구하여 각 온도에 따라 폭발 위험성 여부를 판단할 수 있는 폭발특성 곡선을 도출하였다. 점화원은 세탁물 간의 마찰과 금속 이물질과 세탁물 간의 접촉으로 발생할 수 있는 정전위로 가정을 하였고 실제 세탁물의 온도, 습도 및 대전방지제 사용 여부에 따라 발생하는 정전위를 측정하였다. 유기용제 회수건조기에 투입하는 세탁용제의 양과 농도, 운전온도 등을 변화시키면서 실물폭발실험을 수행하여 세탁소 유기용제 회수건조기의 폭발 발생조건을 확인하였다.

Keywords

References

  1. Ministry of Health and Welfare, "Study on Safety Criteria and Management of Solvent Recovery Unit" (2010).
  2. Enforcement Regulation Clauses 6 of Public Health Control Act, Ministry of Health and Welfare (2005).
  3. J. W. Park, J. H. Jung, and D. H. Hwang, "Risk Analysis and Safety Guideline Proposal on Solvent Recovery Machine in Laundry", Korea Testing Laboratory (2012).
  4. Amendment to Enforcement Regulation Clauses 6 of Public Health Control Act, Ministry of Health and Welfare (2013).
  5. E. J. Park, "The Study on the Possibility of Ignition in a Solvent Recycling Machine at the Laundry", Proceedings of 2010 Spring Annual Conference, Korean Institute of Fire Investigation (2011).
  6. J. Y. Jung, N. R. Lee, H. J. Jyeon, K. Y. Lee and J. K. Park, "Evaluating the Harmful Factor of Laundry Work and Management of Work Environment", Occupational Safety and Health Research Institute (2002).
  7. KS M 2010 : 2008 "Testing Methods for Flash Point of Crude Oil and Petroleum Products - Determination of Flash Point - Tag Closed Cup Method".
  8. ASTM E 681-04 Standard test method for concentration limits of flammability of chemicals.
  9. OECD, "OECD Guideline for Testing of Chemicals Section 1:Physical-Chemical Properties", OECD Publishing (2006).
  10. E. Randeberg, "Electric Spark Ignition of Sensitive Dust Clouds in the sub 1 mJ range, A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor Scientiarum", University of Bergen, Norway, p. 2 (2006).
  11. K. S. Choi, M. Yamaguma and A. Ohsawa, "Ignitability of Sprayed Liquids due to an Electrostatic Spark", Advanced Powder Technology, Vol. 18, No. 1 (2007).