水蒸气引起感烟火灾探测器误报研究

针对水蒸气这种典型的火灾探测误报源．在自行研制的火灾探测综合模拟实验平台中，通过收集水沸腾形成的水雾模拟水蒸气干扰源，研究了冬季与夏季，即不同环境温度务件下，水蒸气对散射型光电感烟火灾探测器的误报影响。通过比较感烟火灾探测器的输出值与其附近湿度变化曲线，分析了误报发生的原因。结果表明在气温较低的冬季，水蒸气较易形成液态小水珠，容易导致感烟火灾探测器误报；而在夏季由于气温较高，这种误报不易发生。

Experimental Study on False Alarms of Smoke Detectors Caused by Steam

The objective of this work was to experimentally investigate the false alarms of scattering photoelectric smoke detectors caused by steam, one of the typical nuisance alarm sources. This was accomplished through a series of experiments on the Fire Emulator/Detector Evaluator (FE/DE) with the steam produced from the boiling water in winter and summer. The humidity near smoke detectors was compared with outputs of smoke detectors to analyze the cause of false alarms. The results showed that the scattering photoelectric smoke detectors tended to give out false alarms by steam in winter, since the steam easily changed into water mist in low temperature. However, this case would not easily happen in summer with very high temperature. Finally, the further work was prospected.