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 ›› 2022, Vol. 41 ›› Issue (6): 744-748.

• • 上一篇    下一篇

砂子基底正庚烷流淌火特性及传热分析

张 康1，张小翠2，李海航1，曲 方1   

  1. （1.中国计量大学 质量与安全工程学院，浙江 杭州 310018；2.嘉兴市消防救援支队，浙江 嘉兴 314000）
  • 出版日期:2022-06-15 发布日期:2022-06-15
  • 作者简介:张 康（1997-），男，河南信阳人，中国计量大学质量与安全工程学院硕士研究生，主要从事流淌火特性和消防安全研究，浙江省杭州市下沙高教园区学源街258号，310018。
  • 基金资助:
    国家自然科学基金青年项目（52106185）；中国博士后科学基金面上资助项目（2021M693042）；浙江省市场监督管理局雏鹰计划培育项目（CY2022003）

Characteristics and heat transfer analysis of n-heptane spill fire on sand base

ZHANG Kang1, ZHANG Xiao-cui2, LI Hai-hang1, QU Fang1   

  1. (1. College of Quality and Safety Engineering, China Jiliang University, Zhejiang Hangzhou 310018, China; 2. Jiaxing Fire and Rescue Division, Zhejiang Jiaxing 314000, China)
  • Online:2022-06-15 Published:2022-06-15

摘要： 摘 要：在砂子基底上进行了未点燃正庚烷的蔓延实验和点燃正庚烷的燃烧实验，研究砂子粒径对正庚烷蔓延和燃烧特性的影响。分析了蔓延距离、火焰前锋、燃烧速率，探究了传热过程对流淌火特性的影响。结果表明，由于砂子的吸附能力随着砂子粒径增大而减小，未点燃的正庚烷在蔓延阶段，其流淌蔓延距离和速度随着砂子粒径增大而增大，且小于无砂工况。随着砂子粒径的增大，正庚烷稳定燃烧阶段火焰前锋先增大后减小、稳定燃烧速率先减小后增大。传热分析表明，当砂子粒径从0.25 mm增大为4 mm时，热传导反馈的减小是引起燃烧速率减小的主要原因；而当砂子粒径进一步增大为8 mm时，热辐射反馈的增大导致了燃烧速率的增大。最后得出砂子的吸附能力是影响蔓延阶段的主要因素，热反馈是影响稳定燃烧阶段的主要影响因素，0.25 mm细砂更适用于流淌火的阻挡扑灭。

关键词: 关键词：流淌火灾, 蔓延距离, 火焰前锋, 燃烧速率, 热反馈

Abstract: Abstract: The spread experiment of unignited n-heptane and the combustion experiment of ignited n-heptane were carried out on the sand substrate to study the influence of sand particle size on the spread and combustion characteristics of n-heptane. The spreading distance, flame front and burning rate were analyzed, and the influence of heat transfer process on the characteristics of flowing fire was explored. The results show that because the adsorption capacity of sand decreases with the increase of sand particle size, the spreading distance and speed of unignited n-heptane in the spreading stage increase with the increase of sand particle size, and are smaller than those of no-sand working conditions. With the increase of sand particle size, during the stable combustion flame front of ignited n-heptane first increases and then decreases, and the stable combustion rate first decreases and then increases. The heat transfer analysis shows that when the sand particle size increases from 0.25 mm to 4 mm, the reduction of heat conduction feedback is the main reason for the reduction of the combustion rate; and when the sand particle size is further increased to 8 mm, the heat radiation feedback increases, leading to an increase in the burning rate. Finally, it is concluded that the adsorption capacity of sand is the main factor that affects the spreading stage, the thermal feedback is the main factor that affects the stable combustion stage, and the 0.25 mm fine sand is more suitable for blocking and extinguishing the flowing fire.

Key words: Key words: spill fire, spreading distance, flame front, combustion rate, thermal feedback