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Convensional Steam Turbines
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Figure 17-3.—Energy relationships in the basic propulsion cycle of conventional steam-driven ships. Since   superheated   steam   is   dry,   it   causes   less corrosion of piping and machinery. For    auxiliary    purposes,    some    steam    is desuperheated by passing through the desuperheater piping  located  in  the  steam  drum.  The  superheated steam is then ready for use to drive the turbine. Expansion In the expansion phase the thermal energy of the  steam  is  converted  to  mechanical  energy  in  the turbines. Turbines use nozzles to convert  the  higher pressure of the steam into a high velocity. The kinetic energy of the steam is then transferred to the turbine blading,   creating   the   mechanical   energy   of   the turbine  rotor.  That,  in  turn,  through  the  reduction gears, turns the propellers. Condensation As the steam leaves, or exhausts through, the turbine, it is condensed so that the feedwater may be reused.  One  boiler  can  generate  150,000  pounds  of steam per hour. If the feedwater were not recovered, the   system   would   require   an   enormously   large evaporator to produce the required feedwater. As  the  steam  exhausts  into  the  main  con- denser,    seawater    passes   through    tubes    in    the condenser.  The  cool  seawater  cools  the  steam  to  the point  of  condensation.  The  condenser  operates  at  a vacuum,  which  helps  this  process  and  increases  the efficiency of the system. The  condensate  pump  takes  a  suction  from the   main   condenser   hot   well   and   delivers   the condensate  (condensed  steam)  into  the  condensate piping  system  and  the  air  ejector  condenser.  The 17-7

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