Simulation of Safe Discharge and Sensitive Mechanism of Micro-Nano Ionized Mine Methane Sensor
Chai Yu1, Gong Liping1, Zhang Jingyuan1,2, Zhao Yongxiu1
1. Electrical and Control Engineering Xi′an University of Science and Technology Xi′an 710054 China; 2. Postdoctoral Mobile Station of Mechanical Engineering Xi′an University of Science and Technology Xi'an 710054 China
Abstract：The methane detection in the mine environments is essential for the prevention of gas disasters. The micro-nano structure ionization sensors have characteristics of fast response, easy integration, etc., it is expected to achieve the rapidly and accurately detection of methane. At present, the internal mechanism of the new sensor is still incomplete, and there is no theoretical and parameter guidance for the safety characteristics of the methane discharge. A fluid-chemical kinetic mixing method was used to simulate the discharge dynamic process of methane-nitrogen mixed gas at the microtip gap of the nanotip. By calculating the degree of electric field distortion caused by space charge, the key parameters of methane non-spark discharge were analyzed, and the safe discharge mechanism of methane was explained based on the electron transport process. Analyzed the evolution process of the positive ion composition and the electron energy with the methane concentration, and finally established the relationship between macroscopic electrical characteristics of the device and the methane ionization effect, improved the sensitive mechanism of micro-nano ionization device, and analyzed its sensitivity. The research laid the theoretical foundation for the preparation of the mine ionized methane sensors.
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2019, Vol. 34 
