The advantages of intermediate steam superheating in marine steam turbine units are analyzed, the history of their use is reviewed, and the prospects for their future application are studied. This process calls for a 15--20 percent lower fuel consumption than the ordinary cycle because of its high thermodynamic effectiveness, attributed to the near isothermic character of the heat flow. Analysis of a T-S diagram for a unit with an initial steam pressure of 100 atm and temperature of 510C showed that intermediate superheating increased the thermal efficiency by 3.8 percent. The steam, after expansion, was drier, which fact increased the turbine efficiency and reduced blade wear. The drier steam also permitted higher initial pressures, thus increasing efficiency. In all, intermediate superheating increases cycle efficiency by 4--5 percent and reduces the high temperature requirements (which demand costly materials). It was first used in 1941 on the C-3E cargo liner Examiner of the USA; its characteristics and successive improvements are discussed. Future prospects are promising because, although the fuel consumption is 4--6 percent higher than for diesels, the cheaper fuel provides a total saving of 7--10 percent. Supertankers of over 100 000 T (of which 48 were ordered in 1966) use larger screw propellers operating efficiently at speeds as low as 80 rpm, which can be provided for by intermediate superheater steam turbines without extra costly reduction gear.

  • Corporate Authors:


    Leningrad,   USSR 
  • Authors:
    • Foldman, M B
  • Publication Date: 1967

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Filing Info

  • Accession Number: 00014611
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Report/Paper Numbers: Russian
  • Files: TRIS
  • Created Date: Aug 12 1973 12:00AM