Holyshev A. Improvement of open exhaust hoods for reducing harmful emissions at the mining machinery plants

The thesis is devoted to reducing air pollution at the workplace of mining engineering enterprises through the use of improved open type exhaust hoods - flanged exhaust hoods with ledge and activated board exhaust. The influence of the annular ledge on the structure of the air flow in the action area of exhaust hood with free air leakage and the presence of ventilated surface sources of harmful emissions, normal to the axis of the hood was determined. Exhaust hoods using with ledge is advisable to removing of harmful emissions from sources of any size, but especially in terms of large-height restrictions of exhaust hoods placing. In mathematical modeling of aerodynamic processes in activated board exhaust using the method of superposition of currents firstly it was considered the flat problem of interaction of three flows: rising flow of harmful emissions over a rectangular bath, flat supply and exhaust retractive jet. It was designed and grounded reasonable method for determining the flow of exhaust air for board exhaust, taking into account its design parameters and aerodynamic features. Using guidelines and methodologies of selection and calculation of the exhaust hood with ledge and activated board exhaust showed their high efficiency for real conditions of thermal production, thus allowed reducing the concentration of harmful substances in the air of workplaces to acceptable values. Occupational Health