Corrosion causes in thermal power plants and ways of prevention

Abstract

Corrosion damages often exert considerable influence on outages number and hence on the loss of thermal power plant availability. In order to accomplish the aim of reducing the corrosion to it's minimum and prevent main thermal power plant corrosion, particularly of steam boilers, it is important to determine corrosion mechanisms and main causes in each particular case. The paper presents corrosion's basics and its various types, the materials used for steam boilers and other parts of thermal power plants. Special attention is given to water preparation, in consideration of its significance for corrosion. There is given general review of corrosion types in thermal power plant facilities also. There were also elaborated corrosion damages of boiler tubing system in TPP 'Ugljevik'. Main causes of corrosion damages have been discovered with recommendations for its reduction. .

Oštećenja i njima izazvani otkazi termoenergetskih postrojenja u velikom broju su izazvani odvijanjem različitih tipova korozionih procesa. Da bi se korozija vitalne opreme termoenergetskih postrojenja, a naročito kotlova, svela na minimum, neophodno je u svakom pojedinačnom slučaju odrediti delujući mehanizam korozije i uzročnike koji ga izazivaju. U radu su prikazani osnovi i vrste korozionih procesa kotlova i drugih komponenata termoenergetskih postrojenja. Posebna pažnja je data pripremi vode, s obzirom na njen značaj za pojavu korozije. Takođe, dat je i opšti prikaz korozionih pojava u termoenergetskim postrojenjima. Obrađena su i koroziona oštećenja cevnog sistema kotla TE 'Ugljevik'. Otkriveni su uzročnici korozije i dat je predlog mera za njihovo eliminisanje. .