Document 361y7YnMOo0rj6GoOQLVbJv6

More TECHNICAL BRIEFS " a^> iu have been uicd extensively f0r m. years, considerable confusion stiQ e/ ' lots as to their characteristics. As essen tlally cheap by-product fuels, they have not received a great deal of attention in the past. In recent years their use in gas turbines and diesel engines has emphasised the need for a better 00. derstsnding of their properties and be havior in combustion chambers. *n>o present paper brings together published information on the nature of residual petroleum fuels, widely scattered In petroleum and engineering journals. ' These fuels usually exhibit a more com plex behavior than heavy-distillate fuels. Specifications for use in naval bollera are more restrictive and, In addition to the properties listed in the foregoing, may limit pour point, specific gravity and carbon residue end may require thermal stability and compatibility testa. No specifications for gas-turbine resi dual fuel have been published as yet. Much resesreh is In progress ind a good < deal more operating experience is re quired. These specifications probably will resemble those for naval fuel with additional restrictions on vanadium and sodium. ASME Paper No. 53-F-l, Station Design Russell Station Reheat Unit, Design and Operating Experience. By t G Me* Chetney, Rochester Cos and Electric <Torp. The first unit installed at Russell Sta tion In December 1948 was of non-reheat design. Electric load growth in the Rochester area required the completion of a second unit two years later. During this Interval, the first unit design was restudied and compared with a reheat design. Plsntwlse the increase in cost of the reheat cycle was small Some ef the items of cost, such as the turbine and increased amount of alloy piping wore offset by-the factor of increased efficiency. This increase in efficiency over tho nonreheat cycle amounted to about 5%, and for a given stntieo de sign output, It decreased the heat input requirements, reduced the slxe of auxil iaries, end the amount of auxiliary power. The overall aspect of the reheat cycle was favorable and such a design . was developed for the second unit E M Gilbert Associates were the consulting engineers for the design. In the late '40'a, there wa a revival of the reheat cycle et temperature* ranging from 9S0 to 1000* F. This OB" (Continued on page TAO) OtraetlMt tw *0*1*$ pop*t P ^__ POWER DECEMBER lM>