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摘要：随着经济的不断发展，机械粉体加工工艺不断的扩展，机械部件周边会积聚大量粉尘，而且在机械加工过程中，许多机械部件相互之间产生不断摩擦，其中95%摩擦功会转变为热能，这些热量会在机械摩擦过程中会不断积累，导致机械部件周围温度在不断的升高，当达到甚至超过到粉尘的着火温度时，粉尘极有可能会被点燃而引发车间粉尘爆炸，给企业和社会造成巨大的经济和人员伤亡。本文主要针对机械摩擦中产生的摩擦热对粉尘点燃的研究，实验通过记录观测摩擦处粉尘随温度的变化状态和红外热像仪探测摩擦过程中温度的变化，得出摩擦出周边粉尘被点燃的临界温度，并通过粉尘层最低温度测试装置测试相关粉尘层的最低着火温度对之前实验结果加以比较、分析，从而为企业和相关研究者提供参考数据及结果，完善生产过程中的粉尘爆炸的防范措施。38703
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毕业论文关键词：机械摩擦；摩擦热；粉尘；红外热像仪
Experimental Study on Dust Ignition by Mechanical Friction
Abstract:With the continuous development of economy, Mechanical powder processing technology is continuously expanding, mechanical parts surrounding will accumulate a large amount of dust, and in the process of machining, the constant friction between many mechanical parts, of which 95% friction work will be converted into heat energy, the heat will will accumulate in the process of mechanical friction, result in higher mechanical parts of surrounding temperature in constant, when reach even more than the ignition temperature of dust, dust likely will be lit and cause workshop dust explosion, to the enterprise and society caused enormous economic and casualties.This article mainly for mechanical friction generated by the friction heat on the research of the dust ignited, the experiment by recording observation friction dust state along with the change of temperature and infrared thermal imaging to detect the change in temperature during the process of friction, it is concluded that the friction dust was lit around the critical temperature, and minimum temperature testing device through the dust layer test related the minimum ignition temperature of dust layer compared with previous experimental results and analysis, so as to provide reference for the enterprise and related researchers data and results, improve the measures to prevent dust explosion in the process of production.
Keywords:Mechanical friction;Friction heat; Dust ;The infrared thermal imager
目录
1绪论 1
1.1 机械摩擦的研究现状 2
1.1.1 摩擦热的分析 2
1.1.2 摩擦热的监测 2
1.2 粉尘爆炸的研究现状 3
1.2.1 粉尘爆炸的下限浓度 4
1.2.2 粉尘爆炸的最小点火能 4
1.2.3 氧气浓度和可燃气体存在的影响 5
1.3 粉尘爆炸的事故分析 5
1.4 机械摩擦对粉尘点燃的研究 6
2实验部分 7
2.1 实验操作平台 7
2.2 实验主要仪器设备 7
2.2.1 红外热像仪 7
2.2.2 粉尘层着火温度测试装置 11
2.2.3 粉尘最小点火能实验装置 12
2.3 实验材料 13
3实验结果与分析 14
3.1 摩擦热点燃粉尘测试 14
3.1.1 面粉机械摩擦分析测试 14
3.1.2 医药粉尘（A）机械摩擦分析测试 17
3.1.3 聚酰胺纤文粉机械摩擦测试 20
3.2粉尘层最低着火温度测试 22
3.3 粉尘云最小点火能测试 24