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

Abstract

Aiming at the problem that common flame arresters can only extinguish deflagration flame, but cannot effectively extinguish detonation flame in large pipelines, this paper proposes a novel structure of detonation arrester based on heat transfer theory to improve the detonation flame extinguishing efficiency. The flame arresting element is composed of a large disk with long triangular slits and is used as the quenching part of detonation arrester in a monolithic structure. Compared with common flame arrester consists of several small fires retarding elements, the proposed monolithic structure is safer due to its integrity. In addition, this paper explores the relationship between flame extinguishing ability, detonation pressure, and temperature change. This investigation determined that the diameter of the quenching part and the parameters(length and height) of the long triangular slits were the key factors affecting the quenching characteristics, and as the diameter and porosity increase, the detonation pressure at the front of the flame arrester will decrease. Finally, the rationality and applicability of the structure are verified by simulation experiments. These preliminary conclusions are helpful to reveal the nature of the proposed structure and solve the technical problem of preventing detonation flame propagation of coal mine gas in large pipelines.

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 27–31 . 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 …”

“…[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. It can be seen that the P max and (dP/dt) max in the initiating vessel and at the end of the pipe were both reduced when The P max dropped from 0.577 to 0.153 MPa, which dropped by 73.5%.…”