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Risk Assessment and Safety Measures for Methanol Separation Process in BPA Plant

BPA 공장의 메탄올 분리공정에서 위험성 평가 및 안전대책

  • Woo, In-Sung (Department of Safety Engineering, Incheon University) ;
  • Lee, Joong-Hee (Department of Safety Engineering, Incheon University) ;
  • Lee, In-Bok (Department of Safety Engineering, Incheon University) ;
  • Chon, Young-Woo (Department of Safety Engineering, Incheon University) ;
  • Park, Hee-Chul (Department of Safety Engineering, Incheon University) ;
  • Hwang, Seong-Min (Department of Safety Engineering, Incheon University) ;
  • Kim, Tae-Ok (Department of Chemical Engineering, Myongji University)
  • Received : 2012.05.04
  • Accepted : 2012.06.20
  • Published : 2012.06.30

Abstract

For a methanol separation column of the BPA (Bisphenol A) plant, HAZOP (hazard and operability) assessment was performed and damage ranges were predicted from the accident scenarios for the fire and the explosion. As a result, the damage range of the jet fire was 20 m in the case of rupture of the discharge pipe (50 mm diameter) of safety valve, and that of the flash fire was 267 m in the case of catastrophic rupture. Also, the damage ranges of the unconfined vapor cloud explosion (UVCE) for the rupture of the discharge pipe and for the catastrophic rupture were 22 m and 542 m, respectively. For the worst case of release scenarios, safety measures were suggested as follows: the pressure instruments, which can detect abnormal rise of the internal pressure in the methanol separation column, should be installed by the 2 out of 3 voting method in the top section of the column. Through the detection, the instruments should simultaneously shut down the control and the emergency shut-off valves.

BPA 공장의 메탄올 분리공정에서 HAZOP 평가를 실시하고, 사고 시나리오로부터 화재 및 폭발 사고의 피해범위를 예측하였다. 그 결과, 화재사고의 피해범위는 50 mm 직경의 안전밸브 토출배관 파열에 의한 제트화재에서는 20 m이었고, 설비가 전파되어 플래쉬화재가 발생되는 경우에는 267 m이었다. 또한 개방공간 증기운 폭발사고의 피해범위는 토출배관 파열에서는 22 m이었고, 설비 전파인 경우에는 542 m이었다. 그리고 최악의 누출 시나리오에 대한 안전대책으로는 메탄올 분리컬럼 내부의 이상압력 상승을 감지할 수 있는 압력계를 2 out of 3 voting으로 설비 상부에 설치하여 주공급라인 상에 설치된 컨트롤밸브와 긴급차단밸브를 동시에 차단할 수 있도록 하여야 한다.

Keywords

References

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