主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2023, Vol. 42 ›› Issue (3): 319-323.

• • 上一篇    下一篇

敷设数量对海上升压站电缆竖井火蔓延的影响研究

许 钢1，袁金霖1，李 印2，汪 箭2   

  1. （1.中国电建集团华东勘测设计研究院有限公司，浙江 杭州 311122；2.中国科学技术大学 火灾科学国家重点实验室，安徽 合肥 230026）
  • 出版日期:2023-03-15 发布日期:2023-03-15
  • 作者简介:许 钢（1986- ），男，浙江杭州人，中国电建集团华东勘测设计研究院有限公司高级工程师，主要从事给排水、消防设计工作，浙江省杭州市余杭区高教路201号，311122。

Experimental study on the effect of arrangement number on vertical flame spread of cables

Xu Gang1， Yuan Jinlin1， Li Yin2， Wang Jian2   

  1. (1. Huadong Engineering Corporation Limited, ZhejiangHangzhou 311122, China; 2. State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui Hefei 230026, China)
  • Online:2023-03-15 Published:2023-03-15

摘要： 在海上升压站电缆竖井中电缆通常是多根成束装配，而电缆数量对火灾危险性有很大影响，因此研究电缆的敷设数量对竖向火蔓延的影响具有重要意义。通过使用自主设计的火蔓延试验平台，对WDZ-YJY电缆以不同数量排布，研究分析其热解、蔓延、滴落等行为的有关参数。通过试验结果分析，将不同敷设数量下电缆竖向顺流火蔓延分为3个阶段：点燃阶段、平稳过渡阶段和快速发展阶段。结果表明：电缆数目的增加没有明显延长燃烧所用时间，而是显著增大了火灾尺度。其中，热解前锋高度大于30 cm后，在电缆数量为3根和4根的最大火蔓延速率超过电缆数量为1根和2根的最大火蔓延速率的200%。研究发现：一方面电缆量多工况质量损失速率较高，其中电缆数量为4根的质量损失速率峰值比2根时高出142%，达到2.39 g/s，反映了电缆数量多的工况单位时间内热解出的可燃物质较多，使燃烧更加剧烈，上方未燃电缆能获得更多热量；另一方面电缆量多工况辐射热流值也较高，辐射热流会缩短预热未燃烧区，缩短未燃烧区的热解时间，结果显示：电缆数量为4根的辐射热流峰值达到2.46 kW/m2，比2根时高出70%。电缆熔融滴落会促进火焰区向下方传播，而敷设数量多的电缆束燃烧过程中的滴落持续时间也明显更长。

关键词: 海上升压站, 电缆, 竖向火蔓延, 质量损失速率, 火蔓延速率

Abstract: Abstract: In the cable shaft, the cables are usually arranged in bundles, which has a great influence on the fire risk. Therefore, it is of great significance to study the influence of the number of cables laid on the vertical fire spread. For this reason, by using the self-designed fire spread experimental platform, the WDZ-YJY cables are arranged in different quantities, and the parameters of pyrolysis, spreading and dripping are studied and analyzed. By analyzing the experimental results, the vertical downstream fire spread of cables can be divided into three stages: ignition stage, smooth transition stage and rapid development stage. Study found that the combustion with more cables haven't spend more time, but extend fire scale. Among them, after the pyrolysis front is higher than 30 cm, the maximum fire spread rate when the number of cables is 3 and 4 exceeds the maximum fire spread rate of 1 and 2 cables by 200%. On the one hand, the mass loss rate of cables is higher in the working condition of multiple cables, and the peak mass loss rate of 4 cables is 142% higher than that of 2, reaching 2.39 g/s, showing that more cables have more pyrolytic products, making the combustion more intense, and the unburned cable above can obtain more heat; On the other hand, the results show that the peak radiant heat flow of 4 cables reaches 2.46 kW/m2, which is 70% higher than that of 2. The dripping will increase the spreading downstream, while the dripping duration during combustion of a heavily laid cable bundle is significantly longer.

Key words: Key words: offshore booster station, cable, vertical fire spread, mass loss rate, fire spread rate