SCIENTIFIC ANALYSIS OF DUST EXPLOSION PHENOMENA

粉尘爆炸现象的科学分析

基本信息

批准号：
14580473
负责人：
DOBASHI Tistu
金额：
$ 1.98万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The potential hazard of dust explosion is increasing due to the recent development of advanced technology. The prevention technique of dust explosions must be changed from the present "field test style" to systematic method of scientific base to manage the explosion risk in the advanced technologies. In this study, the scientific analysis of flame propagating phenomena during dust explosion was conducted to make clear the dust explosion phenomena scientifically. The following results were drawn.1.The experimental apparatus and procedure were established, which is suitable to analyze the flame propagating phenomena during dust explosion. The combustible dust is formed by spraying liquefied heated solid fuel. It is easy to control the particle size distribution and concentration by changing the spraying condition.2.It was found in the observation of propagating flame by high speed photographs that the leading edge of the dust flame is propagating not discretely but continuously.3.The starting point of combustion reaction was analyzed by the observation of chemical luminescence (OH emission and CH emission). It was found that the combustion reaction starts at the point a few mm ahead of the visible leading edge of the flame.4.It was found that the flammable limit strongly depends on the number density of small particles. This result suggests that the combustion reaction at the leading edge of the flame is supported by the combustion of small particles.5.The analysis of above mentioned results from the viewpoints of heat transfer, vaporization, and mass transfer were made to establish a theoretical model of the dust flame propagation.These results are useful not only in the sense of safety engineering (prevention of dust explosion accidents), but also in the academic sense (combustion research).

由于最新的先进技术发展，灰尘爆炸的潜在危害正在增加。尘埃爆炸的预防技术必须从当前的“现场测试样式”更改为科学基础的系统方法，以管理高级技术的爆炸风险。在这项研究中，对火焰在尘埃爆炸过程中的传播现象进行了科学分析，以科学地清除灰尘爆炸现象。绘制了以下结果。1。建立了实验设备和程序，适合分析尘埃爆炸期间的火焰传播现象。可燃灰尘是通过喷洒液化加热的固体燃料而形成的。通过改变喷雾条件来控制粒度的分布和浓度。发现燃烧反应从火焰的可见前缘前几毫米开始的点开始。4。发现易燃极限在很大程度上取决于小颗粒的数量密度。该结果表明，在火焰的前缘的燃烧反应得到了小颗粒的燃烧的支持。5。从热传递，蒸发，汽化和传质的观点中提到的结果分析以建立尘埃宣传的理论模型。这些结果不仅在安全工程学意义上是有用的（还对尘埃式的探索者），而且在探险方面），而且是对爆炸的构图（也是构成），而是对（构成），而是对（构成），而是在以上（包括在内），以实现（构成），以实现（以探索为代表），以实现（以探测为构成）。