Tuesday, 9 April 2019, 14h00, MSG-024 MSSI Building

Complex Method for Determining the Possibility of Scale Formation and Corrosion at Heat Transfer Surface and In Any Water Supply System

ABSTRACT

This presentation is devoted to the development of theoretical bases and experimental methods for determining composition of water that precludes formation of calcium carbonate (and other forms) in the water and, as a result, on heat-exchange surfaces. Water, which was heated without boiling and without air contact, as it happens in cooling systems (40÷80°C) and heat supply systems (70÷190°C) was investigated. Based on the developed experimental procedure, determination of the mechanism of HCO3 decomposition in a heated stainless reactor (with ambient atmosphere) to a predetermined temperature of water (40÷190°C) takes 1-2 days. Decomposition of HCO3 ions by ОН-mechanism (with formation of ОН- and CO2) leads to an increase of рН (ΔрН<0), and by a Н-mechanism (with formation of Н+ and CO32-) leads to a decrease of рН (ΔрН>0). The designed procedure includes determination of hardness and conductivity change (due to the formation of СаCO3) that allows us to define necessary (with a minimum cost) treatment of water in which there is no scale after heating. Three methods for determining the effectiveness of anticorrosive actions have been developed: one for operating conditions and two for laboratory conditions.

ABOUT THE PRESENTER

Sergii Kontsevoi is an Associate Professor at the Faculty of Chemical Technology, Igor Sikorsky Kyiv Polytechnic Institute, Ukraine. He lectures in: Computer processing of information; general (basis of) chemical technology; ecological safety of technological processes and modern equipment for manufacturing processes. His research areas are on the water chemistry of cooling systems and heat-supply networks, especially preventing the possibility of scale forming and corrosion on the surface of heat-transfer equipment. Nowadays the sphere of his scientific interests is extended by computer modeling and calculations of technological processes. He was awarded his PhD degree in 2011 from the KPI, Ukraine. The title of his dissertation was “Theoretical and practical bases of carbonate scaling prevention in the aquatic heat exchange systems”. He worked in the heating supply systems of “Kyivenergo” since 1994 (operator of boiler equipment), process engineer (1995-1996), to 1999 (head of the chemical service). He was consultant of Dow Chemicals in Ukraine – 2001.

Tea/coffee will be available at 13h45

For further information, please contact:  witold.kwapinski@ul.ie