Research On Human Body Electrostatic Discharge In Coal Mine Environment Detonating The Gas

This paper analysis the human body’s dynamic electrostatic discharge whichis easy to be ignored when the miners encountered underground from thecoal mine safety production is faced with the concealment of the angle,especially the human dynamic electrostatic discharge on mine safety at thenarrow trench. Established the human body dynamic ESD model,“thesimulating system of the human body electrostatic discharge detonating gas”and “the simulating device of mining narrow trench” to restore the realenvironment of the mine narrow trench Results are listed as follows:1. Determination the conditions of detonating gas under differentexperimental conditions: Gas concentration by5%~16%; Fire temperaturereaches650℃~750℃; The concentration of oxygen in the gas mixture isgreater than12%. The three necessary conditions are indispensable, onlyachieve at the same time, can explosion the gas.2. The human dynamic movement do a great impact on electrostaticdischarge. In the dry coal mine environment filled with explosive gas,working miners suddenly strip, fall or do other sudden movements, it islikely to bring the body static voltage of several kilovolts above.When thebody electrostatic does not change obviously, the rapid decrease of bodycapacitance causes the body voltage instantaneous increase, and thedischarge energy will increase several times. It is likely to become thesources lead to the gas exploding. Especially in the narrow trench in coalmining, when the working miners from the spacious roadway into thenarrow tunnel, the human potential will rise suddenly and the bodycapacitance will lose suddenly, the rapid decrease causes the body voltage instantaneous increase. It is more likely to cause gas explosion inside thenarrow trench.3. Simulating cavity of narrow trench in coal mining area is designed.With the simulating cavity the body capacitances of miners in uniform dressand different boys wear the same kind of antistatic boots and a boy weardifferent kinds of antistatic boots at the narrow trench. The results show thatthe human capacitance does not matter to do with the height and weight, anddoes matter to do with the resistivity of antistatic boot. The greater thesurface resistivity or the volume resistivity is, the little the humancapacitance is. And results show that the body capacitances of the miners atthe entrance are less than one tenth of the inner. When the body electrostaticdoes not change obviously, the rapid decrease of body capacitance causesthe body voltage instantaneous increase, and the discharge energy willincrease several times. It is likely to become the sources lead to the gasexploding.4. Miners body static electricity with a maximum which is proportionalto the resistivity of the miners dress, and is proportional to the electrostatic half-life.