The Application of Forced Ventilation to the Gas release/dispersionSimulation and Hazard Mitigation at a Petrochemical Plant Site

• Main Authors: Shao-guan Gu, 古紹官
• Other Authors: Yet-pole I
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/81736139281630532957

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.