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Marine Machinery


Year: 2010
Language: english
Author: Liviu Constantin Stan
Genre: Textbook
Publisher: Nautica
Edition: -
ISBN: -
Format: PDF
Quality: eBook
Pages count: 452
Description: Boilers of varied design and working conditions are installed in both steam and motor vessels. The most modern steamships have boiler plant of a sophisticated nature, and even on motorships the steam plant can be quite extensive, providing useful services and enhancing the overall efficiency of the vessel.
The demand for steam propulsion is currently-very low, being confined to specialised ships such as liquid natural gas (LNG) carriers. However, a number of steamships may still be found in service having boiler plant resulting from many years of development. Design modifications have been made to eliminate problem areas and to adjust to changing operational constraints in much the same way that the diesel engine has progressed to its present advanced state. Some of the incentives for and results of this development are touched upon in this chapter.
Water tube marine boilers have been dominant, as far as steam propulsion is concerned, since the period between the two world wars. Even the generation of steam for auxiliary purposes aboard ship has come into the province of the water tube boiler, a practice which grew to prominence with increasing demand for large quantities of auxiliary steam and which persists today in ships such as the large motor tanker. Nevertheless in the field of auxiliary steam production many non-water tube boilers can still be found, especially where steam output and pressure are not high.
Water tube boilers can be made for steam duties as lowasl.5 ton/hand as highas2.5 x 103 ton/h. At the lower end of the range, the water tube boiler is found to be uneconomical and would only be considered for very specialised applications where very high steam pressure was involved. Boilers having duties in the upper end of the output range would be found in central power stations ashore. Steam pressure in water tube boilers can vary between 7 bar and supercritical values such as 225 bar, although natural circulation would only be applicable to pressures below about 175 bar. Steam temperature could range from saturation to 600-650°C, depending upon the fuel and method of firing. With this vast range of duties it is not surprising that the shape and detail of water tube boilers should vary considerably. Although the marine sphere is only a particular section of the whole range, the number of different boiler designs available is large.

Contents

MARINE BOILERS
STEAM TURBINES
MARINE ENGINE CONSTRUCTION
ENGINE OPERATING CYCLES
FUEL OIL
PUMPING SYSTEM
PROPELLERS AND SHAFTING

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