摘要曾经被广泛使用的哈龙灭火剂因被证明对大气层存在危害，因此科学家们积极的寻找一种替代物。超细干粉灭火剂相对于哈龙灭火剂来说存在诸多优点，是良好的哈龙替代物。本文实验设计并搭建了一套适用于超细干粉灭火的小尺度灭火装置，实验通过采用控制变量法来研究粒径、空气流量和流化床装粉高度对灭火时间及火焰温度的影响。实验得出的是：用流化床作为进料装置时，超细干粉的灭火效率除了与粒径有关外，还与流化床中的分的高度和空气的流量有关，粒径越小或空气流量越大，灭火时间越短；流化床中装粉高度增高，通入气体后的床层高度也会增加，当床层高度最接近出管口时，灭火时间最短。本文为了能更好的得出灭火剂和火焰的相互作用特性，实验使用摄像机记录了整个过程，同时使用热电偶记录了不同时间温度的变化。实验发现：灭火剂通过火焰对气流的卷吸作用进入火焰根部，此时灭火剂会阻止空气进入且遇热生成自由基抑制火焰继续燃烧，从而达到灭火的效果。21807
关键词  超细干粉灭火剂  杯式燃烧器  流化床  灭火特性
毕业论文设计说明书（论文）外文摘要
Title    Small-scale experimental study of ultra-fine ABC dry powder
    extinguishing agent interaction with the flame
Abstract
Relative to Halon fire extinguishing, the Ultra-fine Dry powder Fire Extinguishing agent has a lot of advantages and it is a good alternative to Halon. In order to understand and study the case of ultra-fine powder interaction with the flame , the paper designs and builds a cup-burner for powder and a fluidized bed for powder output. Experiment shows some results by measuring the different of powder's diameter, air flow and the height of powder in the fluidized bed: when the diameter of powder is certainly, the higher of air flow, the shorter of extinguishing time; when the air flow is certainly and the powder has fully fluidized, the highest point of the surface is closer to the export, the extinguishing time is shorter. The paper also has observed the interaction of powder extinguishing and the flame. It has concluded: the Ultra-fine Dry powder forms the aerosols with air in the process of fire extinguishing. Then the aerosols entry in the bottom of the flame by air current of the flame. When the concentration reaches the limit extinguishing the flame goes out.
Keywords  Ultra-fine Dry Powder Fire Extinguishing Agent    Cup-Burner   Fluidized-bed     extinguishing effectiveness
目   次
1    引言    1
1.1    研究目的及意义    1
1.2    国内外研究现状    2
2    实验装置的构建    4
2.1    Cup-burner装置的建立    4
2.1.1    杯式燃烧器的主体    4
2.1.2    燃料与空气的控制和输送    6
2.2    干粉的输送    6
3    实验方案及测量方法    7
3.1    火焰温度的测量    7
3.2    图像数据的采集    8
3.3    灭火时间的测量    8
4    实验结果与讨论    9
4.1    空气流量对灭火时间的影响    9
4.2    流化床装粉高度对灭火时间的影响    11
4.3    火焰结构的变化    13
4.4    温度的变化    16
5    实验结论    24 超细ABC干粉灭火剂与火焰相互作用的小尺度实验研究:http://www.751com.cn/huaxue/lunwen_14180.html