摘要： 有些粉尘在达到一定条件之下便可引发粉尘爆炸，由于粉尘爆炸的危害极大，所以生产或者实验操作过程应当重视。粉尘的最小点火能是评判粉尘爆炸严重程度的重要参数之一，所以研究如何确定粉尘云最小点火能的值也是研究粉尘爆炸领域重要的一环。本论文提出一种新的确定粉尘云最小点火能的“安全交线法”，该方法根据某些粉尘不同浓度梯度下最小点火能实验数据的分布规律，能快速又准确地确定某些粉尘云浓度下的最小点火能的值，这种方法的理论依据不但与粉尘云浓度梯度下最小点火能的分布密切相关，还与粉尘本身的物化性质息息相关。本文通过对三种不同类型的粉尘应用安全线法研究表明，安全交线法能很好地应用在各种不同类型的粉尘，误差分析表明，安全交线法对比传统的回归计算方法在分析和预测某些粉尘浓度下的最小点火能具有一定的优势。

关键字：  粉尘云；最小点火能；安全交线法；粉尘爆炸

Analytical Study on a New Method of Determining the Minimum Ignition Energy of Dust Cloud

Abstract:  Some dust can cause dust explosion under some certain conditions. Because of the great extreme harm of dust explosion, the process of production or experimental operation should be paid more attention on. The minimum ignition energy(MIE) of dust is one of the most important factors to estimate the severity of dust explosion, so it will also be an important part of the studying of dust explosion to figure out how to confirm the value of the MIE of dust cloud. This paper is showing us a new method for determining the MIE of dust cloud. This method can quickly and accurately determine the value of the minimum ignition energy under certain dust cloud concentration. This method is not only according to the distribution law of the MIE of certain dust concentration gradients, but also the theoretical basis of this method is having relation with the dust itself. Theoretically, the distribution of minimum ignition energy is closely related to cloud concentration gradients, and also closely related to the physical and chemical properties of dust itself. The paper shows us that the new method——named as “Safety Cross Line method” made a great performance in analyzing the MIE of three different types of dust cloud. It also shows us a good result that “Safety Cross Line”, the new method can apply to fit in different kinds of dust cloud well. After we making an error analysis, we got the result that the safety line method has more advantages in analyzing and predicting the MIE of dust cloud than the traditional regression calculation method in certain dust concentration.

Keyword:  Dust Cloud; MIE; Method “Safety Cross Line”; Dust explosion.

目录

1. 绪论 1

1.1 课题研究意义 1

1.2 课题研究目的 2

1.3 国内外研究进展 2

1.3.1 国内外粉尘云最小点火能研究现状 2

1.3.2 国内外研究不足 3

2. 粉尘爆炸和最小点火能的相关理论 5

2.1 粉尘爆炸理论 5

2.1.1 粉尘爆炸发生机理 5

2.1.2 粉尘爆炸发生条件 5

2.1.3 粉尘爆炸的特性 6

2.2 粉尘最小点火能 6

2.2.1 最小点火能的定义 6

2.2.2 最小点火能的意义 6

3. 粉尘云最小点火能确定测定方法 8

3.1 测定装置 8

3.2 测定步骤 8

4. 粉尘云最小点火能确定方法 10

4.1 粉尘云浓度和粉尘云最小点火能的关系 10

4.2 目前最小点火能确定的方法 10

4.2.1 数学曲线拟合分析法 11

4.2.2 Logistics回归模型统计法分析法 13

4.3 “安全交线法”确定粉尘云最小点火能 18

4.4 方法应用与误差分析 19

4.4.1 三类粉尘的最小点火能确定方法的应用对比 20

4.4.2 误差分析 27

5. 总结与讨论 31

致谢 33