A severe accidental fire with ?explosion? resulting from spraying coloured corn
flour powder occurred at a water fun park in Taiwan. The possible fire
scenarios were studied in this paper using Flame Acceleration
Simulator(FLACS). Environmental conditions including wind action and solid
boundary conditions were deduced based on government fire investigation and
video records, and were used as the input parameters in simulation. Simulation
results indicate that upon ignition of the sprayed powder, the maximum
overpressure in the open space was only 0.03 bar gauge, with a dust flash
fire generated without having an explosion. These environmental conditions or
parameters and the simulation results together would give a fire scene that
agrees with the accident observed, indicating that appropriate environmental
parameters had been identified. Therefore, CFD simulation with carefully
selected parameters can be used to reproduce explosion scenarios and to
identify key factors in supporting accident investigations.
This article discusses the overpressure of a gas explosion and the performance of applying water mist for explosion suppression. According to the experimental results, the larger the opening area, the more difficult it is for pressure to accumulate, resulting in lower overpressure of a gas explosion. When the opening was opened under a high air speed environment, the amount of entrained air was greater. Consequently, the occurrence time of the explosion was shorter than at a low air speed. Despite the water mist nozzle being installed outside the enclosure, a propane gas explosion still occurred regardless of the amount of water mist used, failing to suppress the explosion. However, the water mist nozzle installed inside the enclosure supplied an adequate amount of water mist that could wash a part of the propane, resulting in the fuel concentration dropping below the lower explosion limit, hindering the occurrence of an explosion.
The goals of this project is to investigate the behavior of sulfur and chlorine during pyrolysis and combustion of Illinois coals, the chemistry of boiler deposits and the process of ash formation, and remedial measures to reduce the sulfur and chlorine compounds in combustion gases.
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