Reduction o Air Pollution from Fine Dust by Increasing Efficiency of Gas Emission Purification Sintering Furnaces

The installation of an additional stage of the "wet" waste gas purification unit at the alumina sintering furnaces ensured the achievement of a high degree of purification of gas emissions from fine impurities up to 96 % and the standards of maximum permissible emissions of solid pollutants into the atmosphere established for an industrial enterprise. The formed slude after gas cleaning is proposed to be sent for further processing to the hydrochemistry workshop, thereby ensuring its disposal without contamination of the natural environment. The analysis of air pollution indicators confirmed a decrease in emissions of solid pollutants in the atmospheric air of Achinsk.

WOOD GASIFICATION. INFLUENCE OF PROCESS PARAMETERS ON THE TAR FORMATION AND GAS CLEANING

We present an analysis of influence of biomass pre-treatment and change of gasifying agent on the performance of an oxygen-steam-air updraft gasification plant and a technological process capable of delivering high quality producer gas. The results of these changes on composition of tar collected with absorption type gas purification unit, designed for dust and tar removal are also reported.

Performance evaluation of solar parabolic trough driven water purification system

Application of solar energy to purify the water is advancing rapidly since it is an attractive alternative because of its simple technology; non-requirement of skilled labor for maintenance work, low energy consumption and no fuel is required for operating such water purification unit. This paper deals with the performance evaluation of the solar water purification at Mechanical Engineering Department MMMUT Gorakhpur, India. To perform this experiment, parabolic trough of fixed rim angle and length is considered. Based upon rim angle and length other pertinent parameters are calculated and selection of materials for fabrication of the unit is done. After that solar water purifier unit is fabricated. The solar parabolic collector utilizes the concentrating solar power technology to concentrate the solar insolation. The performance of parabolic trough is evaluated by considering the effect of glass cover on the concentrator. Various results are plotted between the temperature of the fluid and time keeping other parameters held fixed. Further a comparative study is performed for solar water purification unit with and without glass cover. The purity of water is measured based on its pH value and total dissolved solid (TDS).

The use of electrolysis processes in reagent-free water treatment: removal of hydrogen sulfur, organic iron, synthetic surface-active substances

The use of electrotechnical equipment refers to reagent-free methods and makes it possible to simplify the automation schemes for facilities for removing pollutants from aqueous solutions. The article substantiates the approaches and structural diagrams of a reagent-free water purification unit based on the use of electrolysis processes. During the research, the processes of oxidation of pollutants were analyzed when a block of electrochemical action on aqueous solutions was used during processing. A diaphragm cell with an inactive membrane volume of 3.5 liters was used to implement the appropriate reagent-free method for removing pollutants from aqueous solutions. The solution of scientific and practical problems is shown: removal of hydrogen sulfide from water from a well before feeding it to the technological lines of a dairy plant; purification of waste water from an enterprise for the production of gelatinous products from organic iron and related pollutants; reduction of waste water pollutants of a cosmetology enterprise, with a focus on destructive effects on synthetic surfactants. Based on the analysis of the results and treatment modes of three aqueous solutions, the structure of the block of reagent-free electrolysis treatment of aqueous solutions is substantiated. As a result of experimental studies, the prospects of electrical equipment have been confirmed. The reagent-free method will simplify the automation schemes for facilities for removing pollutants from aqueous solutions - accordingly, increase the reliability of such computer-integrated solutions. Further research should be directed to the substantiation, creation and parameterization of mathematical models of combined electrotechnological water treatment complexes. Key words: environmental safety, electrotechnological complex, waste water, reagent-free method, electrolysis processes

ESTIMATION OF HETEROGENEITY OF THE ATMOSPHERIC AIR VELOCITY FIELD IN ADSORBERS OF FRONT-END PURIFICATION UNITS FOR AIR SEPARATION PLANTS

Assuming unidirectional motion of compressed atmospheric air through a vertical cylindrical adsorbent with a fixed granular layer of the front-end purification unit adsorbent, the mathematical model for estimating the heterogeneity of a hydrodynamic velocity field in the radial and axial directions in a turbulent regime is proposed. The model is based on the boundary layer approximation of the Darcy – Brinkman – Forchheimer phenomenological equation. The steady-state flow at low permeability of the granular layer is identified using the collocation method, and the approximate analytical solution is obtained which justifies the applicability of an ideal displacement mode when describing the carrier medium motion. Numerical integration of a boundary value problem of the model equation using the finite-difference method with Richardson extrapolation confirms the conclusion validity. The structure of an accelerated turbulent flow having constant flow velocity in the input section shows that for small Forchheimer coefficients, the Darcy – Brinkman equation is used to obtain the analytical ratio for calculating the length of the initial hydrodynamic section. The proposed mathematical model for estimating the heterogeneity of the velocity field in adsorbers with a stationary dispersed layer is applicable for a laminar flow regime. Testing of this approach by assessing velocity field uniformity for a mass-produced front-end purification unit of air separation plants has shown its efficiency.