There is often a saving in bunker costs of $20 per tonne in the price of intermediate residual as compared with marine Diesel fuel, and converting engines to run on the former is a well-known economy measure. The effect of the saving in fuel cost can, however, be diminished by the increase in operating and maintenance costs resulting from the much higher sulphur and ash levels of the intermediate residual oil. A solution to this difficulty is to use a chemical additive to eliminate the harmful effects of the residual components of the oil. Fuel-oil additives and treatments are often regarded with suspicion; reasons for this include a lack of reliable technical data. Correct application of a fuel-oil treatment, in particular the careful control of dose rate, is essential for satisfactory results. After considering these and some associated matters, the Authors (of the Perolin Company) discuss in more detail the chemical treatment for several types of fuel-combustion problems in both Diesel engines and boilers. These problems are categorised as: (a) storage and handling of the fuel; (b) incomplete combustion, and deposition of free carbon; (c) low-temperature corrosion; (d) high-temperature corrosion and erosion; and (e) ash deposition and fouling. Specific additives are available to deal with the different problems, but it is still important to keep the plant at a high standard of efficiency generally; in the case of turbocharged diesel engines, regular cleaning of the air coolers with a specially-formulated chemical treatment is essential. Perolin have found that fuel-additive costs should not exceed $2 per treated tonne, and can be as little as a tenth of this. Thus, even allowing for heating and centrifuging costs, the conversion to heavy oils from marine Diesel fuel can still show a significant saving.

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  • Corporate Authors:

    Institute of Marine Engineers

    Memorial Building, 76 Mark Lane
    London EC3R 7JN,   England 
  • Authors:
    • George, A M
    • Foulger, J E
  • Publication Date: 1978-3

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Filing Info

  • Accession Number: 00179633
  • Record Type: Publication
  • Source Agency: Institute of Marine Engineers
  • Files: TRIS
  • Created Date: Sep 14 1978 12:00AM