黑龙江省4种针叶树的燃烧性1）

摘要

At the heat release rate of 50 kW· m-2 and a gas velocity of 24 L· s-1 , the experiment was conducted to systematical-ly determine the combustibility of Pinus koraiensis, Pinus sylvestris var.mongolica, Picea koraiensis and Larix gmelinii in Heilongjiang Province by controlled atmosphere tapered calorimeter .Through the comparative analysis of the combustion parameters and the moisture content of barks and withered leaves of each species , the fire resistance of four coniferous spe-cies was evaluated .The heat release rate ( HRR) , total heat release ( THR) , specific extinction area and smoke produce rate are higher in the barks and withered leaves of Picea koraiensis, but the fire performance index is high.Therefore, the fire resistant performance is worse for Picea koraiensis.Burning indexes of Lra ix gmelinii is low, including the smoke pro-duction rate, SPR and the heat release rate, but the fire performance index is high.However, the absolute moisture con-tentand relative moisture content of Larix gmelinii bark is the highest, so it is not flammable.Therefore, Larix gmelinii has high fire resistance performance and can be as the fire preventing tree species.The combustibilities of Pinus koraiensis and Pinus sylvestris var.mongolica are between Picea koraiensis and Larix gmelinii.%在热辐射功率为50 kW· m-2、气体体积流速为24 L· s-1的条件下，采用可控气氛锥形量热仪分别对黑龙江省4种常见针叶树（红松、樟子松、红皮云杉、兴安落叶松）的燃烧性能进行测定。对比分析各树种（树皮、枯落叶）的燃烧参数，结合各树种（树皮、枯落叶）的含水率，对4个树种的抗火性进行评价。结果表明：红皮云杉树皮和枯落叶在热释放速率、总热释放量、比消光面积和烟产生速率均比较高，火灾性能指数高，说明红皮云杉的抗火性能差；兴安落叶松树皮和树叶的各项燃烧指标都较低，释烟、释热都比较缓慢，火灾性能指数高，其树皮的绝对含水率和风干含水率最高，不易燃烧，说明兴安落叶松抗火性能较强，可以作为阻火优先筛选树种；红松和樟子松的燃烧性介于红皮云杉和兴安落叶松之间。