By J. Cowley

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Extra resources for The Running and Maintenance of Marine Machinery

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Wherever the coal is stored, it has to be transported to a ready use day bunker local to the boiler. From there the coal feeds by gravity to the feeder/stokers mounted on Superheat,r support lube / the furnace front. It is now possible to transport coal through pipes using compressed air as the motive means. In this way dust free transfer of coal from any storage bunker to the day bin is accomplished with a minimum space requirement and without segregation or degradation of the coal. A somewhat similar system is available for dealing with the residues of combustion which are normally collected in hoppers beneath the grate and at other strategic locations (Fig 51).

Sufficient energy for atomisation is provided by the electric mot or for all rates of oil flow. Another system uses a separate atomisingfluid. Steam is the usual choice when available although when light ing up before steam becomes available compressed air may beuscd. Steamat lObarorsois used witha maximum oil pressure of about 20 bar. The steam and fuel mix within the atorniser just prior to the point of discharge, where the energy released by the steam shears the fuel into an extremely fine mist (Fig 48).

At lower temperatures these could produce an acid concentration likely to cause vigorous attack on mild steel surfaces, due to the presence of sulphur in the fuel. The actual dewpoint temperature is dependent upon the proportion of the sulphur in the fuel which Is oxidised to sulphur trioxide during combustion, the amount of moisture in the combustion air and the hydrogen content of the fuel. It is difficult to determine in service and the figure of 140°C is given as a guide which experience shows to be adequate for most situations.

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