ABSTRACT

An active system was designed to detect the flame automatically and spurting out the extinguishing agent to prevent the propagation of flame after gas explosion. The effects of both nitrogen and ABC powder (NH₄H₂PO₄) on explosion prevention were examined. The extinguishant was continually spurted into the duct through the nozzles. At the same time, it was blown downstream by the blast wave. The suppression zone was formed both near and downstream of the nozzles, where distributed the nitrogen and ABC powder with high concentration. By increasing the amount of ABC powder and nitrogen pressure, the flame was quenched and the propagation of explosion was prevented in this region. The influences of upward venting and different nozzle positions were also studied. It is more conducive to explosion prevention with the condition of upward venting than that of without upward venting. The critical amount of ABC powder needed to prevent the flame was proportional to the flame speed at the position of the nozzle. Less ABC powder was required to successfully prevent the explosion when the nozzles were set to the position where the flame speed was lower.

摘要

设计了主动系统，自动检测火焰并喷出灭火剂，防止气体爆炸后火焰蔓延。氮气和 ABC 粉末 (NH ₄ H ₂ PO ₄) 对防爆进行了检查。灭火剂通过喷嘴不断喷入管道。与此同时，它被冲击波吹向下游。喷嘴附近和下游都形成了抑制区，其中分布着高浓度的氮气和ABC粉末。通过增加 ABC 粉末的量和氮气压力，火焰被淬灭并阻止了该区域的爆炸传播。还研究了向上排气和不同喷嘴位置的影响。有向上排气的条件比不向上排气更有利于防爆。防止火焰所需的 ABC 粉末临界量与喷嘴位置处的火焰速度成正比。