The intensification of technological processes in modern industries is accompanied by an increase in the volume of ventilation and technological emissions, which have an extremely adverse effect on the environment. As is known, wet dust and gas cleaning devices are widely and successfully used to solve this problem. However, the presence of a droplet dispersion of the working fluid in the purified air flow, which can pollute the atmosphere with components captured during the cleaning process, does not allow achieving the required degree of purification. The article presents designs of radial-inertial droplet eliminators, optimized for functional and energy characteristics, proposed for installation in intensive wet dust and gas purification devices for effective separation of droplet moisture.

Keywords: gas-liquid flow, inertial louver separators, separation of droplet moisture, separating elements

The purpose of the full-scale investigations under the conditions of a pipe electric-welding production in operation was to obtain the necessary amount of actual data characterizing the features of the formation of aerosol emissions, their localization and treatment. During the investigation, the three main groups of factors were considered: the technological factors specifying the features of the technological process of pipe production, the technological conditions factors reflecting the power, frequency and composition of aerosol emissions, the operational aerodynamics of the ventilation systems for localization, removal and treatment of emissions.

Keywords: installations for plasma arc cutting and welding of pipes, gas-air mixture, dust particles size distribution, measuring section, dust density, concentrations of gaseous impurities

The article considers the issues of the enhancement of the reliability of highly efficient cleaning of ventilation and technological dust-and-gas emissions in intensive apparatuses for wet gas cleaning by means of the investigation of the process of drop liquid separation from the cleaned gas flow and through the development of suggestions for design and technological improvements of inertial louver mist eliminators which are a part of gas cleaning equipment and are believed to have the highest potential.

Keywords: intensive apparatuses for wet gas cleaning, inertial louver separators, drop dispersion, critical speed, efficiency of mist elimination

In modern buildings constructed of mineral raw materials, the role of various components of natural sources of ionizing radiation, which form the radiation exposure levels of people, has changed significantly. The article considers the cost estimation of replacing construction materials with an enhanced effective specific activity (Aeff) with alternative materials with a lower Aeff. It has been revealed that the monetary equivalent taking into account the radiation safety depends mainly on the difference between the specific activity values of natural radionuclides (NRN) in construction materials and on the number of inhabitants. With a reduction in the difference between the Aeff values, the cost of the replacement (Ruble/t) of the materials decreases and the monetary equivalent grows.

Keywords: ionizing radiation, effective specific activity, monetary equivalent, collective effective equivalent doses

The article considers the regularities of the formation and the determining factors of the growth of coarsely-dispersed and aerosol entrainment of liquid, which reduces the efficiency of treatment of ventilation and technological emissions in apparatuses for wet gas cleaning, the operation of which is based on intensive modes of liquid and gas interaction. The problem of separation of fine liquid drops contained in the aerosol entrainment is outlined. The operating conditions modes of the separating devices of mist eliminators of existing designs were analyzed and summarized.

Keywords: intensive apparatuses for wet gas cleaning, coarsely-dispersed and aerosol drop entrainment, separation of condensed moisture, mist eliminator

The paper considers the issue of the reduction of radon daughter products exhalation from construction materials into the indoor air of residential buildings. The characteristics of materials obtained through the use of radiation technologies are given.

Keywords: radon, exhalation, equivalent dose, volume activity, radon emanation, penetration, polymers, construction materials, gamma background, radon, radionuclides, alpha particles