| 摘要 |
897,709. Preventing furnace corrosion- BRITISH PETROLEUM CO. Ltd., HYDE, J. W., and RENDLE, L. K. Feb. 27, 1961 [March 23, 1960], No. 10370/60. Class 51 (1). Corrosion is reduced in a furnace burning sulphur containing carbonaceous or hydrocarbon fuel by the injection of a nitrogencontaining shale oil base fraction into the flue gases at a point at which the temperature of the flue is below 400‹ C. The shale oil base fraction is obtained by acid washing a shale oil crude diesel oil fraction, water washing the tar extract obtained, treating- the aqueous phase with an alkali or ammonia and distilling the non-aqueous phase formed. The desired fraction is a light end cut not exceeding 40% by volume, and preferably a 15% by volume cut is used. In a furnace burning a petroleum fuel oil containing less than 5% by weight of sulphur, 0.0-0.06% by weight, based on the fuel of the shale oil fraction is injected into the furnace at a point where the flue gas temperature lies between 177‹ and 316‹ C., upstream of the metal surfaces liable to corrosion. A solution of 5% by volume of the shale oil fraction in normal hexane is injected continuously into the furnace. |
