Evaluation of Techniques for Improving Combustion Aboard Ships. Part II. Medium Speed Diesel Engines (Intermediate Grade Fuels)

摘要

This shipboard project evaluates three techniques for improving medium speed diesel combustion of intermediate marine fuel oils. It describes and appraises the values of fuel washing and fuel treatment by use of commercial additives with water-in-fuel oil emulsions. The report discusses the rationale for fuel conditioning and the use of one approach to determine the optimum water/oil ratio for fuel oil emulsion application to improve combustion. Testing was performed aboard a twin-engined medium-speed diesel Catamaran Tug/Barge owned and operated by Seabulk Tankers, Ltd. Relative merits of the techniques as applied to engine operation and fuel consumption were determined. The comparative effects of fuel conditioning on critical hot gas path components is evaluated and the overall economics of the system when applied to a typical medium speed diesel propulsion plant are presented.