STATE-OF-THE-ART REPORT ON CONTROL OF CORROSION AND DEPOSITS IN STATIONARY BOILERS BURNING RESIDUAL FUEL OIL
2006
Miller, P. D. | Slunder, C. J. | Fink, F. W. | Krause, H. H.
As a result of the higher ash content and the sulfur present in residual fuel oil, the corrosion and deposit problems in the boiler have become a problem. This topical report described in detail the many problems encountered in boilers. These difficulties can be classed as either low- or high-temperature problems. With properly designed burners and controls, it should be possible to reduce greatly the SO3 content of flue gases. In very small-sized boiler units, where operation with low excess air may not be practical, raising the exit-gas temperature sufficiently to ensure that the sulfuric acid dewpoint is never reached would eliminate the low temperature corrosion. For situations in which low-temperatu9e corrosion is limited to the stacks, insulation to maintain adequate wall temperatures is recommended. High- temperature problems, occurring at locations where the metal surface temperatures are about 900 F or higher, appear to be more complex. A solution to the problem is to reduce steam-temperature requirements so as to maintain a maximum superheatertube surface temperature below 900 F. Where this is not possible, the use of additives should be considered.
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