Вплив режимів спалювання рідких сірчистих палив на швидкість низькотемпературної корозії

Abstract

Intensity of the low-temperature sulfuric-acid corrosion when burning standard fuel oil and water-oil emulsions with the water content up to 30.0% has been considered, as well as the dynamics of these processes. The aim of this paper is to analyze the results of the study of the dynamics of the low-temperature sulfuric-acid corrosion, which allows predicting its development during long-term impact of aggressive flue gases. It also enables evaluating the influence of fixed and variable conditions on reliability and durability of low-temperature heating surfaces when burning standard sulfur fuels, as well as water-oil emulsions with water content of up to 30.0%, under exposure to fixed factors (the content sulfur in fuel oil, the air excess coefficient α, the metal temperature tст, the water content in the emulsion) and variable conditions (fluctuations of α and tст). A statistical analysis of the impact of variable operating conditions of convective surfaces with temperatures below the sulfuric acid vapor dew point is carried out. The experimental dependences of the corrosion processes dynamics are obtained. The results of the study of the fuel oil and water-oil emulsion burning are compared. The regression equations obtained on the basis of these studies allowed building dependences of the corrosion rate at different temperatures of the wall, the air excess and time of gas exposure up to 1000 hours. It allowed comparing corrosive zones under the change of these factors and making a conclusion about the possibility of achieving a high boiler efficiency by burning water-oil emulsions.