多火灾升温条件下超薄型钢结构防火涂料隔热性能研究  

Insulating properties of ultra-thin fireproof coatings for steel structure under various heating conditions

作　　者：张佳庆 黄玉彪 蒋恭华 何灵欣 丁彦铭 ZHANG Jiaqing;HUANG Yubiao;JIANG Gonghua;HE Lingxin;DING Yanming(Anhui Provincial Key Laboratory for Power Fire and Safety Protection(State Grid Transmission and Transformation Facilities Fire Protection Laboratory),State Grid Anhui Electric Power Co.,Ltd.,Electric Power Research Institute,Hefei Anhui 230601,China;School of Engineering,China University of Geosciences,Wuhan Hubei 430074,China)

机构地区：[1]国网安徽省电力有限公司电力科学研究院电力火灾与安全防护安徽省重点实验室(国家电网公司输变电设施火灾防护实验室),安徽合肥230601 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《中国安全科学学报》2024年第9期114-120,共7页China Safety Science Journal

基　　金：国家电网公司科技项目(5500-202216111A-1-1-ZN)。

摘　　要：为准确评估换流站钢结构的抗火性能,基于换流站中可能出现的标准、电力及碳氢火灾情况,通过耦合微尺度热重-红外光谱(TG-FTIR)联用热解试验与小尺度耐火试验炉隔热试验,同时在标准、电力及碳氢3种火灾升温条件下,研究超薄型钢结构防火涂料的热解机制以及对不同材质、不同截面形状系数钢构件的隔热性能。试验结果表明:火灾升温速率越快,防火涂料热解的质量损失速率峰值越大,且对应的峰值温度也更高;不同火灾升温曲线对防火涂料热解逸出的气体类型并无显著影响,但对逸出气体量和逸出峰值温度有影响;相比于电力和碳氢火灾升温曲线,标准火灾升温曲线下,防火涂料在750℃之前释放出更多热解气体,从而更好地发泡膨胀,更快地起到抗火隔热效果;进一步,超薄型防火涂料在碳钢和不锈钢基体以及多种截面形状系数下,其在电力和碳氢火灾升温下的耐火极限均明显低于标准火灾,隔热性能显著降低。To achieve the accurate evaluation of steel structure fire resistance in the converter station,based on the possible standard,power and hydrocarbon fire scenarios,the thermal insulation mechanism of ultra-thin fireproof coating as well as its thermal insulation performance on steel members with different steel materials and different cross-section shape factors were investigated through micro-scale thermogravimetric-Fourier transform infrared(TG-FTIR)spectroscopy experiments and small-scale fire test furnace heat insulation experiments.The experimental results show that the faster the fire heating rate,the higher the peak mass loss rate and the higher the peak temperature of the fireproof coating.Different fire heating curves have no effect on the type of gases escaping from the thermal decomposition of fireproof coatings,but have an effect on the amount and peak temperature of escaping gases.Compared with the power and hydrocarbon fire,in the condition of standard fire,more gases are produced before 750℃,resulting in better expansion and heat insulation.Furthermore,the fire resistance of the ultra-thin fireproof coatings on the carbon steel and stainless steel at various cross-section shape factors at power and hydrocarbon fire is worse than that of standard fire,indicating poor heat insulation abilities.

关 键 词：升温条件 超薄型钢结构防火涂料 隔热性能 标准火灾 碳氢火灾 钢构件 

分 类 号：X932[环境科学与工程—安全科学]