本文選題：火花放電　切入點：放電特性　出處：《沈陽航空航天大學》2017年碩士論文　論文類型：學位論文

【摘要】：在石油、化工、醫(yī)藥、危險化學品儲運等行業(yè),由于電火花引燃導致的爆炸事故時有發(fā)生。但對事故的深入調查顯示,電火花在其發(fā)生、發(fā)展過程中的能量轉移過程是復雜的,即表現為對預混爆炸環(huán)境點燃的較強隨機性。伴隨近代工業(yè)發(fā)展帶來的危險化學品生產、使用量的高速增加,以及高阻物料的比例提升,電火花引燃風險越來越引起人們的關注,電火花放電過程能量分布及其釋放規(guī)律的研究,以及電火花引燃過程的關鍵參數研究又成為了研究的新熱點。本文依托柱形容器預混氣體爆炸實驗裝置,應用自制的電容儲能放電點火裝置,采用理論與實驗相結合的方法,對電火花放電物理過程、電火花間隙能量釋放過程及電火花能量功率變化對點火能力的影響進行了研究。實驗發(fā)現,電容儲能高壓間隙擊穿放電過程呈明顯的間隙擊穿和間隙擊穿后的振蕩續(xù)流兩個過程,而電火花能量的釋放主要發(fā)生在間隙擊穿后的振蕩續(xù)流過程。觀察間隙擊穿后的振蕩續(xù)流階段間隙電壓、電流曲線,可以得到由于放電回路的電阻損耗效應,放電間隙中的能量釋放呈現明顯的衰減性。針對濃度為5%的液化石油氣進行火花引燃實驗,發(fā)現電火花能量釋放的總釋放能、功率對其點火能力均存在影響,電火花功率影響更為明顯。電火花引燃機制的研究將為電氣防爆技術的完善和應用提供進一步的理論依據,為生產過程安全條件的確立提供有價值的數據支撐。
[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.
【學位授予單位】：沈陽航空航天大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ086.52

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