升温模式对防火密封胶燃烧及理化性能的影响

The influence of fire heating modes on the combustion and physicochemical properties of fireproof sealant

为研究防火密封胶在不同火灾场景下的燃烧及理化性能变化,针对特高压直流换流站中可能出现的标准、电力及碳氢火灾情况,研究3种升温模式对防火密封胶燃烧过程的影响及燃烧后不同时刻的理化性能变化。燃烧过程重点关注质量变化,理化性能重点关注腐蚀性、耐水性、耐酸性、耐碱性、耐油性、耐湿热性和耐冻循环性等,进而比较3种升温模式对防火密封胶的影响。结果表明:电力和碳氢火灾的前期危险性远高于标准火灾。燃烧120 min后,3种升温模式下防火密封胶的总失重率基本相同,均达到85%。火灾升温后,防火密封胶的耐水性和耐酸性都被严重破坏。电力火灾和碳氢火灾较标准火灾对防火密封胶的耐湿热性和耐冻融循环性影响更大。

In order to study the combustion and physicochemical properties of fireproof sealant in different fire scenarios, according to the standard, power and hydrocarbon fire that may occur in UHV DC converter stations, the effects of three fire heating modes on the combustion process of fireproof sealant were studied. Changes of physicochemical properties at different time after combustion were studied too. The mass loss was paid attention to during the combustion process. The corrosion resistance, water resistance, acid resistance, alkali resistance,oil resistance, humidity and heat resistance and freeze cycle resistance were focused more among all physicochemical properties. Then the effects of three fire heating modes on fireproof sealant were compared. The results show that the early danger of power and hydrocarbon fire is much higher than that of standard fire. After 120 minutes of combustion, the total mass loss rate of fireproof sealant under the three heating modes is basically the same, reaching 85%. After the fire, the water resistance and acid resistance are seriously damaged. Electric fire and hydrocarbon fire have a greater impact on the damp heat resistance and freeze-thaw cycle resistance of fireproof sealant than standard fire.