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EXPERIMENTS FOR DETERMINING THE MINIMUM IGNITION ENERGY OF DUST-AIR MIXTURE
Abstract
Because, in most cases, dust explosions cause significant damage to the environment, they can be treated as a disaster. Appropriate measures must be taken to prevent explosions. These measures are aimed at preventing the formation of explosive atmospheres, preventing the occurrence of ignition sources and limiting the effects of the explosion. Static electricity is one of the sources of ignition of the potentially explosive atmosphere of dust / air. Assessing the occurrence and the possibility of initiating discharges in all kinds of real situations is the most important and most difficult step in analyzing the dangers created by electrostatic charges. Knowing the amount of energy released in the spark and the sensitivity of the existing explosive dust / air atmosphere, characterized by the minimum ignition energy, it can be determined whether or not the ignition occurs. The minimum ignition energy of the combustible dust and air mixture is an essential parameter for assessing the risk of ignition of the potential explosive atmosphere of dust / air through electrostatic discharges. For the determination of the minimum ignition energy, the standardized method is described in the European standard EN 80079-20-2:2016 Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test methods. This method uses a Hartmann tube with a capacity of 1.2 liters where the dust is dispersed and the dust / air mixture is ignited. For ignition, an electrical spark is generated between two electrodes, a spark whose nominal energy is calculated as E = 0.5C · U2, where C is the value of the storage capacitor and U is the value of the voltage at the capacitor terminals. Research carried out in the INCD INSEMEX laboratories has shown that the current methods of determining MIE for explosive dust / air mixtures need improvements. According to the latest research, it was found that the actual energy of the spark is lower than the nominal (calculated) energy. This paper presents the comparative results between the standardized method and a new method that is based on the measurement of the discharge energy.
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References7
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