Methodical Approach Cleaning Emergency Ventilation Systems Emissions of Harmful Substances

Abstract

In the event of an emergency situation at an industrial site with the release of ventilation systems into the atmosphere, a cleaning device is required, which should ensure that the excess of the explosive concentration in the surface layer of the atmosphere is above the normative value. Quantitatively, the release of explosives depends on the degree of depressurization of the system, its volume and pressure in it, the speed of the formation of the team to close the shut-off organs and its execution. The purification device of emergency emissions should have the properties of adequate counteraction to the specified accident factors for equipment that does not have internal self-protection. The emergency emissions are of a probabilistic nature, and therefore the structure of the treatment equipment and its operating conditions must differ from the structure and conditions when cleaning only technological emissions. The cleaning equipment must be able to neutralize large mass outlays of emissions in a short period of time, the operation of the equipment must be built on the principle of waiting for work, that is, in the automated mode, the time of entry into operation should be determined when hazardous concentrations of explosives in the room occur. The performance of the exhaust emergency ventilation and the moment of its activation are determined by the conditions for reaching the concentration of explosives in the room not exceeding 0,1 of the lower concentration limit of flame propagation in gasair explosive mixtures and ensuring dispersion of surface concentrations not higher than the established standard values, and for non-explosive mixtures – Only the second condition.