Burning-through of porous flame arresters with a channel flame-arrester element

Abstract

Numerical analysis of the burning-through of porous flame arresters was performed. It was shown that the burning-through time for porous flame-arrester elements of the channel type is determined by the time of flame entry into the porous element, and for granular-type elements, it is determined by the propagation time in the element. The fire resistance of a channel flame arrester increases with increasing thermal conductivity of the material of the porous flame-arrester element and its length and with decreasing effective size of the channels and porosity of the flame-arrester element. It is established that, by increasing the length of the porous element or by decreasing the channel diameter and porosity, it is possible to ensure that the flame that arises behind the flame arrester is stabilized on the exit surface of the flame-arrester element without penetrating into it.

Investigation on quenching characteristics of parallel narrow channels for deflagration flames

“…The collision probability of free radicals with the parallel plate increased, the number of free radicals absorbed by the parallel plate increased and the number of free radicals involved in the reaction decreased, resulting in an imbalance between the heat absorbed by the parallel plate and the heat generated by combustion. [27][28][29][30][31] When the heat absorption by the parallel plate was greater than the heat release from combustion, the temperature at the front of the flame would drop below the ignition point, resulting in quenching of the flame. 32,33 The explosion pressure curves with and without parallel narrow channels in the initiating vessel and at the end of pipe are shown in Figures 4 and 5.…”

A novel detonation arrester containing a large disk with long triangular slits: Design and numerical simulation

“…The purpose of this device is to prevent the temper of a gas generator set, a lightning strike at the outlet of an exhaust pipe, fire source caused by friction between gas and pipe wall, and pipe static electricity and other accidents 6‐9 . By absorbing and transferring the heat of the flame, the flame arrester prevents the propagation of the flame, thus avoiding the heavy casualties and property losses caused by the flame propagation 10‐13 …”