Journal . ndsupon the demands from the factory, and the turbine must fulfilthese conditions. If it is not possible to supply more steamthan the maximum load will allow to pass, and if the load isnot available, steam cannot be passed through. An additionalquantity of heating steam can be obtained, however, by makinguse of a by-pass reducing valve. A by-pass pipe is takenfrom the main inlet to the heating steam pipe, and containsan ordinary reducing valve, so that should the demand forheating steam be greater than the turbine will give (that is tosay, when the whole of the heating steam is passi
Journal . ndsupon the demands from the factory, and the turbine must fulfilthese conditions. If it is not possible to supply more steamthan the maximum load will allow to pass, and if the load isnot available, steam cannot be passed through. An additionalquantity of heating steam can be obtained, however, by makinguse of a by-pass reducing valve. A by-pass pipe is takenfrom the main inlet to the heating steam pipe, and containsan ordinary reducing valve, so that should the demand forheating steam be greater than the turbine will give (that is tosay, when the whole of the heating steam is passing throughto heating, and none of it is going through to the condenser),then, if more steam is required what will really happen will EXTRACTION TURBINES. 219 be that the pressure will drop slightly in the heating pipe. Thereducing valve in the by-pass from the steam inlet will auto-matically open and give the extra supply required. Extraction Turbine Section. Connection forSeating Steam Hiqh Fig. 4. Fig. 5.—Steam Curves for Extraction Turbines. Where the power required is great, say 4/5,000 KW., andthe quantity of heating steam required is only sufficient to givehalf load, it is better to supply two turbines—one a back-pressure turbine for heating purposes, and the other ahigh-pressure turbine coupled electrically to the can be done, and the two together make one extractionturbine. An advantage is gained in this method in that thehigh-pressure turbine is better economically than an extractionturbine, used simply as a high-pressure turbine. 220 EXTRACTION TURBINES. STEAM CURVES FOR EXTRACTION TURBINE 1250 KW 3000 RPM EXTRACTION TURBINEGEARING AND 3000 RPM DC GENERATOR 80000 70000 §60000 q:uj </) 50000 GO < 40000 30000 20000 10000 I I I I I 0-l l0 I I I I INITIAL STEAM 180 LBS 220 F SUPERHEATSTEAM TO HEATING 30 LBS DGAUGEVACUUM 28,/2
Size: 1677px × 1489px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade186, bookpublisherlondon, bookyear1861
