热轧机车间动力电缆包覆用防火布燃烧特性研究

发布时间：2018-04-08 15:07

本文选题：动力电缆　切入点：热轧机　出处：《中国科学技术大学》2017年硕士论文

【摘要】：轧制加工是当今钢铁工业以及有色金属制品工业的主干工程,热轧机车间中生产工艺布局复杂,用电设备众多,大量使用可燃液体以及动力电缆,一旦发生火灾,危险性很高,造成极大的经济财产损失,生产企业常选用防火布来保护生产设备设施的消防安全。本文通过锥形量热仪实验和实体火灾实验研究了热轧机车间动力电缆的被动防火系统具体应用方案。1、锥形量热仪实验本文选取五种常用的防火布石棉纤维防火布、陶瓷纤维防火布、硅胶防火布、涂胶防火布、碳素纤维防火布,通过锥形量热实验研究不同辐射强度对防火布燃烧性能的影响。结果表明:所选五种样品在受热辐射作用时均可被点燃,点燃时间的均方根倒数与辐射强度之间呈现线性关系;在35 kW/m2辐射强度工况下,碳素纤维防火布的热释放速率最大,达到272.59 kW/m2,有效燃烧热的峰值也最大,达到529.52kJ/g;综合比较各样品的燃烧性能,防火能力强弱顺序为硅胶防火布石棉纤维防火布陶瓷纤维防火布碳素纤维防火布涂胶防火布。2、实体火灾实验通过实体火灾实验分析研究了热轧机车间不同类型防火布对动力电缆包裹的具体应用方式:通过预实验,对比了庚烷池火和液压油池火在6mm石棉纤维防火布包裹状态,庚烷的火焰温度高于液压油火焰温度,但是防火布内层温度比较一致,实验时间5min内,对电缆的保护效果比较一致,温升情况也比较接近。6mm厚度防火布在300s内能够实现包裹和保护电缆的作用,同种包裹厚度下,三种耐高温防火布中,石棉纤维和陶瓷纤维防火布包裹性能较优,两种防水防护布材料中,硅胶防火布包裹性能较优。通过正式实验,五种防火布的包裹顺序为陶瓷纤维防火布石棉纤维防火布硅胶防火布碳素纤维防火布涂胶防火布。选取石棉纤维防火布和陶瓷纤维防火布与硅胶防火布组合包裹发现,外层不刷油时,硅胶防火布(内层)+陶瓷纤维(外层)包裹性能最优:外层刷油时,石棉纤维防火布(内层)+硅胶防火布(外层)包裹性能最优。通过本文的研究,在实际生产应用中,硅胶防火布、石棉纤维防火布、陶瓷纤维防火布的防火能力较强,在机器漏油情况少的车间,选取硅胶防火布(内层)+陶瓷纤维防火布(外层)包裹性能最优,在机器漏油较多的车间,石棉纤维防火布(内层)+硅胶防火布(外层)包裹性能最优。本文研究能够为同类型生产企业设置被动防火系统时提供指导和借鉴。
[Abstract]:Rolling is the main project in the iron and steel industry and nonferrous metal products industry. The production process layout is complex, the electric equipment is numerous in the hot mill workshop, and the flammable liquid and power cable are used extensively. Once the fire occurs, the danger is very high.The production enterprises often choose fire-proof cloth to protect the fire safety of production equipment and facilities.In this paper, the concrete application scheme of passive fire-proof system of power cable in hot mill workshop is studied by means of conical calorimeter experiment and solid fire experiment. In this paper, five kinds of commonly used flame-proof fabric asbestos fiber fire-proof cloth are selected in conical calorimeter experiment.Ceramic fiber fire proof cloth, silica gel fire proof cloth, coated fire proof cloth and carbon fiber fire proof cloth were used to study the effect of different radiation intensity on the burning performance of fire proof cloth by cone calorimetry.Reaching 272.59 kW / m2, the peak value of effective combustion heat is also the highest, reaching 529.52 KJ / g. The combustion performance of each sample is compared synthetically.The order of fire resistance is silica gel flame-proof cloth, asbestos fiber, fire-proof fabric, ceramic fiber, fire-proof cloth, carbon fiber, fire-proof cloth. 2. Solid fire experiments are conducted to study different types of fire prevention in hot rolling mill workshop by means of solid fire experiment.The specific application of fire cloth to power cable wrapping: through pre-experiment,The results show that the flame temperature of heptane is higher than that of hydraulic oil flame, but the temperature of inner layer of fire proof cloth is the same, and the experimental time is 5min, compared with that of hydraulic oil pool fire, the flame temperature of heptane is higher than that of hydraulic oil flame.The protective effect of the cable is consistent, and the temperature rise is similar to that of the fire resistant cloth with a thickness of 0.6 mm. In the case of the same coating thickness, the effect of wrapping and protecting the cable can be realized within 300 s. In the three kinds of fire-resistant cloth with the same thickness,The encapsulation performance of asbestos fiber and ceramic fiber fire proof cloth is better than that of silica gel fire proof cloth.Through the formal experiment, the order of the five kinds of fire-proof cloth is ceramic fiber fire-proof cloth, asbestos fiber anti-fire cloth, silica gel anti-fire cloth, carbon fiber anti-fire cloth, adhesive fire-proof cloth.When the outer layer is not brushed with oil, the coating performance of silica gel fire proof cloth (inner layer) ceramic fiber (outer layer) is the best: when the outer layer is brushed,Asbestos fiber fire-proof cloth (inner layer) silicone fire-proof cloth (outer layer) wrapping performance is optimal.Through the research of this paper, in the actual production application, the fire proof ability of silica gel fire proof cloth, asbestos fiber fire proof cloth and ceramic fiber fire proof cloth is stronger, and in the workshop where the machine oil leakage is less,The coating performance of silica gel fire proof cloth (inner layer) ceramic fiber fire proof cloth (outer layer) is the best, and the asbestos fiber fire proof cloth (inner layer) silicone fire proof cloth (outer layer) is the best in the workshop where the machine oil leakage is more.This study can provide guidance and reference for the same type of production enterprises to set up passive fire-proof system.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG338

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