可燃气体爆炸极限影响因素研究

The minimum ignition energy of combustible gas concentrations were decreased first and then increased with the increase of concentrations.LPG minimum ignition energy is 3.85mJ,corresponding to a concentration of 7.5%;the minimum ignition energy of methane is 5.19mJ,corresponding to a concentration of 11%.According to both of the the changing trends pictures,we can get the parabolic equation of LPG and methane between the minimum ignition energy and concentration.The upper explosion limit of combustible gas decreases sharply with the increase of the concentration of the inert gas , while the lower explosion limit basically unchanged.Through linear regression analysis,obtaining the linear regression equations between methane concentrations and the upper explosion limit of methane,nitrogen. In the analysis of the suppression effects of inert gas,we derive that nitrogen explosion suppression limit concentration is 23%, the concentration of carbon dioxide explosion suppression limit is 32%.Through the golden section method in the optimizing method, the simplify experimental method is given when we need the minimum ignition energy,the experimental results can reduce the blindness of experiment, obtain the minimum ignition energy of combustible gases quickly and accurately.
1.1 课题研究的意义.......................................................................................................... 1 1.2 国内外研究现状及发展趋势...................................................................................... 1
可燃气体最小点火能随浓度呈先减小后增大的趋势，液化石油气最小点火能为 3.85mJ，对应浓度为 7.5%；甲烷最小点火能为 5.19mJ，对应浓度为 11%，并且根据二 者变化趋势图，得出液化石油气、甲烷最小点火能与浓度之间的抛物线方程。可燃气体 爆炸上限随惰性气体浓度上升急剧减小，而爆炸下限基本不变。通过线性回归分析，获 得甲烷爆炸上限与氮气、甲烷浓度之间的一次线性回归方程。在分析惰性气体对甲烷抑 爆作用中得出，氮气抑爆极限浓度为 23%，二氧化碳抑爆极限浓度为 32%。通过优选法 中黄金分割法，给出简化最小点火能实验的方法，该结果可以减小实验的盲目性，快速、 准确地获得可燃气体的最小点火能。
学号： 09412110
常州大学 毕业设计（论文）
（2013 届）
题目
可燃气体爆炸极限影响因素研究
学生
学 院 环境与安全工程学院 专 业 班 级
安全 091
校内指导教师
百度文库
专业技术职务
校外指导教师
专业技术职务
二○一三年六月
可燃气体爆炸极限影响因素研究
摘 要：可燃气体爆炸已经逐渐成为工业生产、生活中主要危害之一，因此研究可燃气 体爆炸机理对预防可燃气体爆炸具有重要意义，而爆炸极限是研究可燃气体爆炸的一个 重要参数。影响可燃气体爆炸极限的因素很多，本文主要以液化石油气、甲烷为例，通 过实验及查找文献等，运用对比分析、线性回归、黄金分割等方法进行研究，研究结果 如下：
Key words：LPG；methane；minimum ignition energy；Inert gas；Explosive limit
II
目录
摘要 ............................................................................................................................................. I 目录 .......................................................................................................................................... III 1 引言 ........................................................................................................................................ 1
关键词：液化石油气；甲烷；最小点火能；惰性气体；爆炸极限
I
Research on influencing factors about combustible gas explosion limits
Abstract：Combustible gas explosions have become one of the main hazards among the industrial production and the life step by step, therefore, it is very important to do research on the combustible gas explosion mechanism to prevent the combustible gas explosion, and the explosive limit is is an important parameter when we do study on combustible gas explosion. There are many factors affect the combustible gas explosion limits, in this paper, we give LPG, methane for examples, researching with the methods of comparative analysis, linear regression and optimization through doing experiments and searching for literature.The results are as follows:
1.2.1 国外研究现状................................................................................................... 1 1.2.2 国内研究现状................................................................................................... 2 1.2.3 课题研究的发展趋势....................................................................................... 2 1.3 研究课题内容.............................................................................................................. 3 1.3.1 课题研究的目标............................................................................................... 3 1.3.2 拟解决的关键问题........................................................................................... 3 1.3.3 研究方案的确定............................................................................................... 3 2 可燃气体爆炸基本知识 ........................................................................................................ 5 2.1 爆炸及其分类.............................................................................................................. 5 2.1.1 爆炸概念........................................................................................................... 5 2.1.2 爆炸的分类....................................................................................................... 5 2.2 可燃气体爆炸.............................................................................................................. 6 2.2.1 单一气体分解爆炸........................................................................................... 7 2.2.2 混合气体爆炸................................................................................................... 7 2.3 爆炸极限的概念 ......................................................................................................... 8 2.4 液化石油气基本知识.................................................................................................. 8 2.4.1 液化石油气组成成分....................................................................................... 8 2.4.2 液化石油气理化性质....................................................................................... 8 2.4.3 液化石油气危险特性....................................................................................... 8 2.5 甲烷基本知识.............................................................................................................. 9 2.5.1 甲烷理化性质................................................................................................... 9 2.5.2 甲烷危险特性................................................................................................... 9 3 可燃气体爆炸实验研究 ...................................................................................................... 10 3.1 爆炸实验装置............................................................................................................ 10 3.1.1 可燃气体爆炸实验图..................................................................................... 10 3.1.2 可燃气体爆炸箱............................................................................................. 10 3.1.3 点火能调节装置..............................................................................................11 3.1.4 可燃气体供给装置......................................................................................... 12 3.1.5 流量调节装置................................................................................................. 12