| Summary: | 碩士 === 國立雲林科技大學 === 防災與環境工程研究所 === 97 === This research employed CFD based 3D gas fire/explosion simulation software,
FLACS, to assess the hazardous degree of hydrogen sulfide leakage within a
petrochemical process. A series of gas dispersion simulations were performed to
realize the hazardous characteristics and the corresponding risks of the release
accident. Through the 3D dynamic property of FLACS, user can easily understand
the influence of different atmospheric conditions and building obstacles on the
downwind area when toxic gas is released. The results can further be used to assess
the hazardous degree of personnel within the plant site when an accident takes place.
Study shows that the hazardous level and range can be greatly influenced when the
following parameters, such as gas leakage circumstances (atmosphere condition and
wind speed) and mitigation measures (number and direction of fans), have been
changed.
This research also employed FLACS simulation to explore the feasibility of
utilizing explosion-proof fans as mitigation equipment, and further discussed whether
the hazardous range and level of the toxic gas release accident can be reduced in order
to alleviate the impact on the personnel. Using mechanical fan of different number,
position, and ventilation direction combined with natural wind of certain direction,
this research attempted to find out the best combination from various mitigation
designs and to compare the influence of fan directions on hazard mitigation. The
result showed that the hazardous level of toxic release can be effectively alleviated
when the direction of mechanical ventilation was against the natural wind direction.
With the help of CFD simulation and quantitative risk analysis technique, different
loss prevention strategy can be tested via this study procedure in order to secure the
safety of a petrochemical process and establish an expected harm-free working
environment.
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