感烟火灾探测器的木材热解阴燃火试验模拟研究

Simulation Study on Smoldering(Pyrolysis)Wood Fire Test of Smoke Detector

通过PyroSim模拟感烟火灾探测器火灾灵敏度试验室内木材热解阴燃火,发现天花板以下0.30 m范围内烟浓度偏差最大为0.04/m,试验测量仪器和样品安装在此区域内不同位置产生的测试差异可忽略。缩短加热时间可以提高烟浓度,加热时间宜在440 s~660 s之间;相同加热时间下,升高加热盘最高温度烟雾浓度反而下降,加热盘温度设置在600℃较为合适;环境温度升高或环境湿度升高,烟浓度下降,但在大部分样品响应数值段差异不大,0.20/m以上才出现较大差异。通过PyroSim模拟不同加热时间、加热盘最高温度、环境温度、环境湿度下木材热解阴燃火烟雾浓度,可以实现不同试验条件下对木材热解阴燃火烟雾浓度的预测。

Through PyroSim to simulate the fire sensitivity test room of the smoke fire detector,the wood pyrolysis smoldering fire was found,and the maximum deviation of the smoke concentration within 0.30 m below the ceiling was found to be 0.04/m.Test measuring instruments and samples were installed at different locations in this area.The difference can be ignored.Shortening the heating time can increase the smoke concentration,and the heating time should be between 440 s~660 s;under the same heating time,increasing the maximum temperature of the heating plate will decrease the smoke concentration.It is more appropriate to set the heating plate temperature at 600℃;the ambient temperature rises or the environment As the humidity increases,the smoke concentration decreases,but there is not much difference in the response value range of most samples,and there is a big difference above 0.20/m.PyroSim can simulate the smoke concentration of wood pyrolysis smoldering fire under different heating time,heating plate maximum temperature,ambient temperature,and environmental humidity,which can realize the prediction of wood pyrolysis smoldering fire smoke concentration under different test conditions.