Coal/Oil mixture fuels (COMs), i.e., suspensions of 30% to 50% (by weight) of pulverised black coal in heavy petroleum oil with or without stabilising additives, are not new. These fuels are intended to retain many of the handling, storage, and combustion characteristics of oil while taking advantage of the comparative cheapness of coal, but the economics of their production and use have not been favourable. COMs have, however, now become economically feasible for certain land applications. For marine applications, the economic case has not been proven, but the possibilities for using these fuels are of some interest. The Author outlines the history of coal/oil fuels since the first published reference to them (in an 1879 U.S. patent); tests in Cunard liners during the 1930s are mentioned. The properties, combustion characteristics, production, application, and economics of COMs as boiler fuels are then discussed. The mixtures are inherently unstable, and stability considerations have materially affected proposed production methods. Of the several approaches to this problem, that now favoured is the production of a fairly stable mixture whose homogeneity can be maintained by intermittent mixing or agitation. COM economics for marine applications have not yet been studied in detail, but the Author discusses the special factors involved--bunker space, fuel weight, and plant efficiency. In new ships, the possibilities of COM-fired fluidised bed boilers look interesting. The burning of COMs in Diesel engines has not yet been shown to be a practical proposition, although some interest is being displayed. It is assumed that COMs would not be made up on board ship, but on the other hand it is not clear whether they could be made available for bunkering at ports throguthout the world. Order from BSRA as No. 54,284.

Media Info

  • Features: References;
  • Pagination: 9 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00324750
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Paper No. 9
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM