Ferrous metallurgy enterprises annually emit into the atmosphere a significant amount of highly dispersed dust with a particle size of 10 microns or less. The article presents the results of a study performed to determine the dispersed composition of aerosols in dust and gas air flows coming from emission sources to unorganized sources of emissions into the atmosphere. Based on the results of microscopic analysis with determination of the fractional composition of the dust, integral dependences of the density of distribution over equivalent sizes (diameters) D for the ingredients accepted for the study were obtained. This made it possible to determine the average median values of the equivalent sizes of dust particles of harmful substances. An assessment of the power of dust emissions from unorganized sources of steelmaking enterprises into the atmosphere of cities has been carried out. In order to improve the environmental safety of the steelmaking shop, it was concluded that it is advisable to reconstruct existing aspiration systems using highly efficient wet dust collectors.

Keywords: metallurgy, aerosol, dust, ingredient, particle, dust collector, electric steelmaking shop, dispersion analysis, distribution density ,average median diameter, dh 50

At the present stage of increasing competition, the increased level of threats to the economic condition of business entities in any sector of the economy requires special attention. Enterprises of this industry annually emit aerosols of various composition and origin into the atmosphere: iron, vanadium, aluminum oxides, manganese oxides and other heavy metals. One of the components of safety is environmental safety and ensuring safe working conditions. The chemical composition of the dust-gas-air mixture of metallurgy enterprises is considered in the article, and the dispersed composition of aerosol emissions is determined. The data of the results of microscopic analysis of the fractional composition of dust based on the data of integral dependences of the density of distribution by equivalent sizes (diameters) D for the ingredients accepted for the study allowed us to determine the average median values of equivalent dust diameters.

Keywords: metallurgy, aerosol, electric steelmaking shop, dust-gas-air mixture, dispersion analysis, average median diameter, dh 50

The article deals with issues related to the operation of dedusting systems for technological equipment in the production of gypsum and gypsum building materials. The purpose of the research is to identify the features of the layout and operation modes of aspiration systems operated at existing enterprises. Data on the mass of dust determined from the results of measurements entering the working area from individual technological units are given. According to the results of measurements, it was found that from 10% to 20% of the mass of dust released in the technological process enters the working area. Examples of layout solutions for branched aspiration systems serving conveyors, transfer units, crushers of various types are given. It is shown that the reasons for their unsatisfactory work are the lack of aerodynamic linkage and insufficient volumes of removed air. The features of the layout and operating modes of the aspiration system from the gypsum boiler and mill are described. It is shown that individual sections of the system and the system as a whole operate in non-stationary modes, which is due to the variability of the flow rates and dustiness of the moving dust and gas flows.

Keywords: dustiness, dust emission, aspiration system, aerodynamic coupling, flow rate, concentration, dust and gas mixture

The article is devoted to the issue of improving devices for cleaning gas station emissions from hydrocarbon vapors to improve the environmental safety of zones and territories of residential development. The largest part of the release of gasoline vapors entering the local aspiration systems is associated with the filling and emptying of fuel storage tanks at gas stations. It is known that emissions of benzene vapors belonging to the second hazard class have a significant problem in terms of exceeding the maximum permissible concentrations at the boundaries of the sanitary protection zones of gas stations and nearby residential buildings. Creation of new highly efficient technologies and devices for reducing the volume of pollutant emissions from gas filling complexes, while reducing operating costs by the amount of emissions and waste generated, developing reliable gas trapping devices of acceptable low material and energy consumption for gas station aspiration schemes is an urgent task. Another reason of elaborations’ needs of those gas trapping devices are reducing operating costs and environmental payments for emissions and waste. It was carried out environmental – economic research to verify justification to use absorption-type apparatuses within an absorbent mixture of sodium-magnesium salt’s solution (bischofite solution) and waste water of from a local purification device. It was allowed reducing emissions from sources of gas station aspiration schemes using capturing gasoline hydrocarbon vapors by mention above apparatus. It is essential reducing negative emissions’ impact of harmful substances and an additional amount of generated waste of gas stations. There are presented the results of calculating volume of the fees’ environmental damage, and economic efficiency of the use the proposed type of sorbent’ apparatus in this article also. The use of the proposed device in gas station aspiration schemes allows deceasing environmental payments for emissions including carbon taxes and fees and additional operating costs in terms of the use of consumables. The successful tests carried out have shown the reliable and efficient operation of the pilot plant with the proposed device at the gas station. The successful tests carried out have shown the reliable and efficient operation of the pilot plant set up with the proposed device that decreased environmental payments for emissions, waste and operating costs.

Keywords: gas station, gasoline, emission, atmosphere, concentration, hydrocarbons, aspiration, absorption, device, bischofite, water

The article describes the design solution of a system for dedusting emissions into the atmospheric air using vortex inertial devices with counter-swirling flows (CSF) and a separator-concentrator. An approach to evaluating the efficiency of such a dust collection system is described. Analytical dependencies and a flowchart for calculating the efficiency of the system are presented.

Keywords: vortex inertial dust collector with counter swirled flows (CSF), separator-concentrator, dust collecting system, dust cleaning efficiency