摘要
基于启动瓶微小泄漏造成气体灭火系统误喷的事实,针对启动瓶瓶头阀密封膜片的泄漏问题建立数学模型,计算出一定压力下微小孔径的泄漏量,说明存在微小泄漏的可能性。通过对气体在水中溶解度和溶解速率的分析,应用气体溶解速率的“双膜理论”和气体扩散的“菲克定律”,从理论上计算出气密性试验中的氮气在水中的溶解速率。并以无管网气体灭火系统为例,计算出由于启动瓶微小泄漏可能导致误喷的时间,得出满足标准气密性试验条件的启动瓶也有可能由于慢性泄漏而导致气体灭火系统误喷的结论。
Based on the fact that the gas extinguishing system malfunction was caused by startup gas cylinder＇s micro leak, the models for the leak problem of valve＇s sealing film are established, and the possibility of micro leak is investigated by calculating leakage rate of micro aperture at certain pressure. By means of analyzing the solubility and solubility rate of gas in water, and making application of double-film theory and Fick＇s law, the solubility rate of nitrogen in water is theoretically calculated in gas tightness test. Taking no pipe network gas extinguishing system as the example, and computing the time of malfunction due to the micro leak, it is concluded that the gas extinguishing system probability leads to malfunction because of startup gas cylinder＇s slow micro leak.
出处
《消防科学与技术》
CAS
2006年第1期61-64,共4页
Fire Science and Technology
基金
天津市科技发展计划项目(043113011)
关键词
气体灭火系统
误喷
泄漏
气体扩散
菲克定
律
双膜理论
gas extinguishing system
malfunction
leakage
gas diffusion
Fick＇s law
double-film theory
