Effects of fuel impurities on the fireside corrosion of boiler tubes in advanced power generating systems - a thermodynamic calculation of deposit chemistry

Thermodynamic equilibrium calculation relating fuel chemistry with flue-gas composition and volatile condensate deposits on tube metals upon combustion of various dirty fuel was conducted for a better understanding of the deposit chemistry of superheater tubes in steam-generating boilers. Corrosive impurities such as sodium. potassium, chlorine, and sulfur. inevitably involved in fuel. were considered in the calculation. Possible influence of flue-gas temperature on deposit chemistry was investigated as well. Based on the flue-gas composition and the deposit chemistry, corrosion environments of steam-generating boilers firing various dirty fuel were discussed. (C) 2001 Elsevier Science Ltd. All rights reserved.