| 摘要 |
948,272. Heating air for combustion. ZAVODY VITEZNEHO UNORA NARODNI PODNIK. March 2, 1961, No. 7584/61. Heading F4B. Air for combustion in a steam generator is preheated by steam extracted from a second evaporating stage of the generator, condensate from the preheater being returned direct to a boiler drum of a first evaporating stage. Air is drawn into the generator through a duct 1 and passes through the preheater 2 and a bypass duct 3 as determined by valves 4 and 5. The coils 9 of the preheater are fed with steam from a cyclone 8 of the second evaporating stage via a pipe 7 and condensate from the preheater flows by gravity through a pipe 10 to the boiler drum 12 of the first evaporating stage. A branch pipe 13 connects the pipe 7 to the steam space of the drum 12 so that if the tapped cyclone provides more steam than is required the excess may flow to the drum or if insufficient steam is supplied the drum 12 may be used as an additional source of supply. After passing through the preheater 2 the air is further heated by flue gases in the heater 22. |
