| Summary: | 碩士 === 長榮大學 === 職業安全與衛生學系碩士班 === 102 === In recent years, the cause for disasters in recycling plants has mostly been electric appliances or chemicals. If regular inspections of the appliances in the factories could be made, it would decrease the chance of disasters. If a fire were to occur, the smoke could easily affect the evacuation of the personnel, therefore smoke exhaust equipment and escape routes are extremely important. At present, domestic industries and fire departments mostly use ALOHA simulation software to conduct initial emergency range assessment; however, the software is unable to account for blockages caused by obstacles, making the accuracy of safety zones questionable.
Exploration results showed that most hazards are unobservable to the human eye, such as damage to the surface of cables and poor stickiness of insulation tape after many years of use, which result in interruption of production and temperatures of the cables exceeding the permitted values in the distribution box. The potential hazards can be understood by use of IR thermal imaging.
This research discussed if evacuation could be executed successfully under worst case scenarios in this plant. The number of evacuating personnel was increased from 20 to 50 people, and simulations showed that all of the personnel could reach the exit without being affected by the smoke and heat, and with no injuries and deaths.
This research discovered that the radiant heat affected area estimated by ALOHA software was too rough; it clearly overestimated the consequences, which could cause misjudgments during rescue. FDS proved to be more accurate in predicting the radiant heat affected area. When there was ambient influence, such as wind or obstacles, FDS was much more accurate than ALOHA in analog assessment. Also, FDS can be used to see the effects on the existence of sprinkler systems; under the same oil tank with various contents burning inside, the different radiant heat levels and its effects could be clearly observed. Summing the above, assessment of obstacles and water curtains on radiant heat are incidents that ALOHA is incapable of handling.
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