火花放电功率对混合气体引燃能力影响的研究

发布时间：2018-03-12 21:38

本文选题：火花放电　切入点：放电特性　出处：《沈阳航空航天大学》2017年硕士论文　论文类型：学位论文

【摘要】：在石油、化工、医药、危险化学品储运等行业,由于电火花引燃导致的爆炸事故时有发生。但对事故的深入调查显示,电火花在其发生、发展过程中的能量转移过程是复杂的,即表现为对预混爆炸环境点燃的较强随机性。伴随近代工业发展带来的危险化学品生产、使用量的高速增加,以及高阻物料的比例提升,电火花引燃风险越来越引起人们的关注,电火花放电过程能量分布及其释放规律的研究,以及电火花引燃过程的关键参数研究又成为了研究的新热点。本文依托柱形容器预混气体爆炸实验装置,应用自制的电容储能放电点火装置,采用理论与实验相结合的方法,对电火花放电物理过程、电火花间隙能量释放过程及电火花能量功率变化对点火能力的影响进行了研究。实验发现,电容储能高压间隙击穿放电过程呈明显的间隙击穿和间隙击穿后的振荡续流两个过程,而电火花能量的释放主要发生在间隙击穿后的振荡续流过程。观察间隙击穿后的振荡续流阶段间隙电压、电流曲线,可以得到由于放电回路的电阻损耗效应,放电间隙中的能量释放呈现明显的衰减性。针对浓度为5%的液化石油气进行火花引燃实验,发现电火花能量释放的总释放能、功率对其点火能力均存在影响,电火花功率影响更为明显。电火花引燃机制的研究将为电气防爆技术的完善和应用提供进一步的理论依据,为生产过程安全条件的确立提供有价值的数据支撑。
[Abstract]:In the petroleum, chemical, pharmaceutical, hazardous chemical storage and transportation industries, explosion accidents caused by the ignition of electric sparks occur from time to time. However, an in-depth investigation of the accidents shows that the process of energy transfer during the occurrence and development of electrical sparks is complex. That is, the strong randomness of igniting the premixed explosive environment. With the development of modern industry, the production of dangerous chemicals, the rapid increase in the use of chemicals, and the increase in the proportion of high-resistivity materials, People pay more and more attention to the risk of spark ignition. Research on key parameters of EDM ignition process has become a new research hotspot. In this paper, based on the experimental device of premixed gas explosion of columnar container, the self-made capacitor energy storage discharge igniting device is used, and the method of combining theory with experiment is adopted. The effects of the physical process of electric spark discharge, the energy release process of electric spark gap and the change of energy power of electric spark on the ignition ability are studied. The process of capacitor energy storage high voltage gap breakdown and discharge is obvious gap breakdown and oscillation continuous current after gap breakdown. However, the release of EDM energy mainly occurs in the oscillatory continuation process after gap breakdown. Observing the gap voltage and current curve after gap breakdown, the resistance loss effect of the discharge loop can be obtained. The energy release in the discharge gap is obviously attenuated. In the spark ignition experiment of liquefied petroleum gas (LPG) with concentration of 5%, it is found that the total energy released by the discharge energy and the power have an effect on the ignition ability. The study of EDM ignition mechanism will provide further theoretical basis for the improvement and application of electrical explosion proof technology and provide valuable data support for the establishment of safety conditions in production process.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ086.52

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