Daihatsu, of Japan, who produce four-stroke main and auxiliary Diesel engines, have been undertaking research to facilitate and expedite the use of residual fuels in auxiliary engines. The company's studies (which are continuing) have embraced both unblended residual fuel and residual blended with Diesel Fuel, and the article discribes some experiences in the practical application of the results of these studies. When using unblended residual for an auxiliary engine (a more difficult procedure than in a propulsion engine), a dual-fuel system is employed which allows Diesel fuel to be burned during starting and stopping and when transferring the load between engines. Once the load in a running engine has reached a certain value, the fuel supply is changed over, normally automatically, to residual fuel. Exhaust valves and seats, pistons, cylinder liners, fuel nozzles, and other engine components may need modifying to withstand the effects of the residual fuel, and a higher grade of lubricating oil is needed. If blended fuel is to be used, a blending system is installed in the ship; the article includes a diagram of a typical system, in which the residual fuel supply, up to the blending unit, is common to both auxiliary and propulsion engines. The blended fuel may consist of between 30 and 70% residual and the remainder Diesel fuel; the actual ratio depends on a number of factors. When the proportion of residual is low, blended fuel can be burned in some engines without their being modified. The article lists the benefits of using blended fuel and the prescriptions that may be needed, and includes a description and brief discussion of the results, described as excellent, of using blended fuel for the appropriately-modified 720-rpm auxiliary engines of two large Japanese ferries.

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  • Corporate Authors:

    IPC Industrial Press Limited

    Dorset House, Stamford Street
    London SE1 9LU,   England 
  • Publication Date: 1980-1

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Filing Info

  • Accession Number: 00314994
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Aug 27 1980 12:00AM