Análises da corrosão em tubos de caldeira no tratamento de água de make-up

Abstract

Water quality is an important factor inherent in the generation of steam, fundamental to the transformation of mechanical energy into electrical energy through turbines element process. The water requires special care, in every line of treatment from abstraction to the cycle steam generation. The present study was performed in a thermal coal plant located in the southern half of Rio Grande do Sul in the city of Candiota, which has three stations and five water treatment turbogenerators with total capacity of 796 MW. Developed in the water treatment phase B was held in which an analysis of corrosion by immersing sample tubes aquotubulares boilers as well as verification of the variability of process variables through statistical control with the aim of analyzing sector the quality of boiler feed water through the data obtained through chemical analysis, such as hydrogen potential, pH, conductivity, concentration of iron, hydrazine and dissolved oxygen O2-in aqueous media and the corrosion rate by tests . The letters generated controls showed the high variability of the process and through immersion tests of specimens, colorimetry and infrared spectrometry analysis evidenced a severe of 5 mpy corrosion rate in the face of high concentrations of O2 40 µg L -1. The methodology is characterized by being a quantitative experimental and theoretical research.