超细微粒灭火剂施放与流动性能研究

Discharging and Flow Ability of Superfine Powder Extinguishing Agent

为了掌握超细微粒灭火剂的施放与流动性能,采用平均粒径为6,μm左右的超细微粒灭火剂为试样,采用基于爆发原理的灭火剂施放装置,在10,m3大小的封闭灭火室进行冷喷实验,对施放后灭火剂微粒的浓度分布进行了测量.结果表明,用爆发式装置施放超细微粒灭火剂后,灭火剂能迅速向四周均匀抛洒,但抛洒后的浓度分布并不均匀,在气流力作用的方向上微粒的浓度较高,角落处浓度最低;施放0.35,s后,气流力影响消失,灭火剂微粒出现自由沉降和扩散,局部空间保持较高的微粒浓度.灭火剂粒径和动力气体发生剂装药的能量释放功率对灭火剂施放效果有较大影响.施放功率越大,微粒在受限空间内扩散越快,分布越均匀.超细化的微粒灭火剂具有全淹没条件下的火灾保护潜力.

In order to investigate the flowing ability of superfine powder extinguishing agent , particle concentration distribution was tested by a laser measuring system designed by the authors in a 10 m3 closed room. The average particle size of the extinguishing agent is about 6 btm. A new discharge device of extinguishing agent was designed according to bursting principle and employed in experiment. The experimental results indicated that extinguishing agent powder could be quickly dispersed after discharge. However, the concentration was not evenly distributed. Particle concentration was relatively high in the bursting direction but low in the comer of room. Bursting effect disappeared about 0.35 s later after discharging. Then, particles of extinguishing agent diffused freely. The concentration of extinguishing agent remained relatively high in the local space. It was found that both energy releasing power of gasgenerating agent and particle size of extinguishing agent had a great effect on dispersion of extinguishing agent. The more of energy releasing power and the less of size of extinguishing agent, the more quickly the extinguishing agent dispersed and the more uniform extinguishing agent particle distribution is in the limited space. Superfine powder fireextinguishing agent has the potential for fire protection under total flooding conditions.