Water quality as one of the possible causative agents of corrosion in thermal power plants

Abstract

Damage and cancellations of thermal power plants in large numbers are caused due to an inadequate quality of feed water, which occur due to different types of corrosion processes. Water is a good solvent and its chemical composition contains a large number of ingredients which provide its very complex chemical composition. That is the reason why raw water provides possibilities of complex and different corrosion processes. Since water is a basic fluid in power plants, it needs adequate preparation in order to minimize corrosion processes and to control them. It is necessary in each particular case to determine the acting mechanism of corrosion and sources that cause it. This paper presents the basic causes that lead to corrosion in thermal power plants. To achieve a high level of reliability of power plants and achieve their expected lifetime it is necessary to provide high quality water, due to its importance for the occurrence of corrosion. .

Oštećenja i njima izazvani otkazi termoenergetskih postrojenja u velikom broju su izazvani usled neadekvatnog kvaliteta napojne vode, usled čega se odvijaju različiti tipovi korozionih procesa. Voda je dobar rastvarač i u svom hemijskom sastavu sadrži i veliki broj primesa koje joj daju veoma složen hemijski sastav. Upravo zbog toga sirova voda pruža mogućnost odvijanja niza kompleksnih i različitih korozionih procesa. Zbog toga je vodu, kao osnovni fluid u termoenergetskim postrojenjima, potrebno podvrgnuti adekvatnoj pripremi kako bi se korozioni procesi sveli na minimum i mogli kontrolisati. Neophodno je u svakom pojedinačnom slučaju odrediti delujući mehanizam korozije i uzročnike koji ga izazivaju. U radu su prikazani osnovni uzroci koji dovde do korozije termoenergetskih postrojenja. Da bi se ostvario visok nivo pouzdanosti rada termoelektrana i postigao njihov očekivani radni vek mora se obezbediti visok kvalitet vode, s obzirom na njen značaj za pojavu korozije.