Flameproof enclosures are widely installed as safety equipment at dangerous
industrial sites to reduce ignition risks. However, electrical components
typically installed in such flameproof enclosures for the production process
can cause ignition and compromise the safety of the enclosures. Thus, in
such cases, the explosive characteristics of the flameproof enclosures is
severely affected. Accidental gas explosions in industrial sites rarely
occur under standard operating conditions. Premixed gas explosions in
flameproof shells are complex processes. A 560 mm ? 400 mm ? 280 mm
flameproof enclosure commonly used in industrial sites was used to
investigate the phenomenon. The explosion characteristics of ethylene-air
premixed gas in the flameproof enclosure was simulated using Fluent software
to investigate the influences of ignition source location, ignition source
energy, ambient temperature, and obstacles on the maximum explosion
pressure, maximum explosion pressure rise rate, and maximum explosion index
of the flameproof enclosure. The results revealed that the surface area of
heat exchange considerably influences the maximum explosion pressure of the
flameproof enclosure. The larger the ignition energy is, the larger the
maximum explosion pressure value, the maximum rate of explosion pressure
rise, and the maximum explosion index of the flameproof enclosure are. With
the increase in the ambient temperature, the maximum explosion pressure
decreased, whereas the maximum rate of explosion pressure rise and the
maximum explosion index exhibited limited change. The results of this study
provide theoretical guidance for the design and suppression of flameproof
enclosures.