阴角夹角构型对聚氨酯保温材料火蔓延影响试验探究

摘 要：通过开展小尺寸试验研究，分析了阴角夹角构型对聚氨酯保温材料向下火蔓延特性的影响，分析不同夹角构型对聚氨酯保温材料火蔓延典型特征参数的影响，主要包括火焰形态、质量损失速率、近域场温度和火蔓延速率。研究结果表明：在边墙的约束条件下，阴角夹角为30°时试样的燃烧程度明显大于150°；对于阴角夹角构型形成的受限空间，小角度夹角构型下聚氨酯试样燃烧程度大于较大夹角构型；受侧边墙体限制效应的影响，聚氨酯保温材料火蔓延过程中质量损失率和火蔓延速率均随阴角夹角的增大呈先减小后增大的趋势；由于烟囱效应的拉伸作用，火蔓延会形成两个温度峰值，且第一个温度峰值大于第二个温度峰值。

Experimental study on the influence of internal angle configuration on fire spread of polyurethane insulation material

Abstract: Aiming at the fire accidents caused by overload, short circuit and equipment aging of indoor power transformer, the mechanism of transformer fire heat radiation and toxic gas diffusion is studied, and the effective method of power transformer fire suppression is sought. Taking 10 kV oil immersed power transformer as an example, a fire test platform was built to simulate the early fire scene of indoor power transformer. The gas concentrations of CO, NO, SO2 and O2 before and after the fire were collected. According to the test data, we analyzed the variation law of temperature and thermal radiation at different locations of the fire scene, and used perfluorohexanone fire extinguishing agent to suppress the fire of transformer at last. The test results show that perfluorohexanone extinguishing agent has fast fire extinguishing speed and has obvious effect of heat absorption and cooling. The cooling rate can reach 80 ℃/min. This test is not destructive to the electrical equipment of transformer in the fire of indoor power transformer. It realizes the controllability of indoor transformer fire and the improvement of fire extinguishing efficiency. It is a new idea for the research on fire suppression of power transmission and transformation system equipment.