燃烧条件对PVDF膜材产烟特性的影响

在不同热辐射强度、引燃火焰条件下对典型PVDF膜材进行小尺寸产烟特性研究,测试PVDF膜材的比光密度、质量损失率、烟气组分等参数。对试验数据分析发现,当热辐射强度达到50kW/m²时,无论是否有引燃火焰,PVDF膜材均发生燃烧现象;且在PVDF膜材在被引燃的情况下,各模式的比光密度变化不大,未被引燃情况下的比光密度最大。同时,在引燃火焰相同的情况下,热辐射强度越高的模式,PVDF膜材的质量损失率就越高;在热辐射强度相同的情况下,有引燃火焰比无引燃火焰的模式质量损失率更大。此外,PVDF膜材燃烧释放的主要有害烟气组分有CO、CO₂和不完全燃烧的碳氢化合物,以及少量HCN、SO₂等;且相同热辐射强度下,试样在有引燃火焰模式下比无引燃火焰模式下释放的CO₂和CO更多;在相同引燃火焰模式下,热辐射强度越大,释放的CO₂和CO就更多。

Effect of combustion conditions on smoke production characteristics of PVDF film

The small-scale smoke production characteristics of PVDF film were studied under different thermal radiation intensities with or without ignition flame. Then the specific optical density, mass loss rate, smoke composition and other parameters of PVDF film were tested. It is found that when the heat radiation intensity reached 50 kW/m2, the PVDF film will burn no matter whether there is ignition flame or not; In the case of PVDF film ignited, the specific optical density of each mode has little change, but the specific optical density is the largest in the case of non ignited. At the same time, under the same ignition flame, the higher the thermal radiation intensity, the higher the mass loss rate of PVDF film; Under the same thermal radiation intensity, the mass loss rate of the mode with pilot flame is higher than that without pilot flame. In addition, the main harmful flue gas components released by PVDF film combustion are CO, CO2 and incomplete combustion hydrocarbons, as well as a small amount of HCN and SO2; Under the same thermal radiation intensity, the sample released more CO2 and CO in the mode with pilot flame than in the mode without pilot flame; Under the same ignition mode, the higher the thermal radiation intensity is, the more CO2 and CO will be released.