. Railway mechanical engineer . ht of water the stoker firingis no less economical than the expert hand firing. Theadvantage shown for hand firing is about 19 per cent whenfiring 40 lb. of coal per square foot of grate per hour, anddecreases to nothing when firing 180 lb. per square fof)t.(See Fig. 15.) There is practically no difference in the superheat of the steam with or without the stoker. Therange of the superheat is between 130 and 2S5 deg. Stoker to Conveyor.—The stoker engine ordi-narily exliausts to tlie atmosphere, but there is also a pipe con-nection to the base of the el
. Railway mechanical engineer . ht of water the stoker firingis no less economical than the expert hand firing. Theadvantage shown for hand firing is about 19 per cent whenfiring 40 lb. of coal per square foot of grate per hour, anddecreases to nothing when firing 180 lb. per square fof)t.(See Fig. 15.) There is practically no difference in the superheat of the steam with or without the stoker. Therange of the superheat is between 130 and 2S5 deg. Stoker to Conveyor.—The stoker engine ordi-narily exliausts to tlie atmosphere, but there is also a pipe con-nection to the base of the elevator screws, and when tliiswas used the coal was dampened by the exhaust steam. Withthis connection in use in test No. 5470 there was a markedreduction in the smoke and also a smaller coal consumption,but as there w-as only one test made under these conditionsno verj definite conclusions can be drawn, although theindications are that there is some advantage to be gainedby its use. The results obtained with it, compared with. 60 80 100 120 I40 Hevotu-f-ions Per Mfnu^e. 160 ISO Fig. 14. Tliermal Efficiency of tine Locomotive Ijoth hand and stoker-fired tests without it, are shown m thefollowing table: Stoker-Fired Tests TestXo. 5,447 5,449 5, Testdesig-nation . Coalfired, hour 5,5055,7836,0196,304 Equivalent Smol^eevaporation per per-Ib. dry coal centage Exhaust of stoker engine to— ConveyorAtmosphereAtraospaereAtmosphere Hand-Fired Tests 5,432 120-30-F 5,428 120-30-F 5,441 120-30-F 4,6414,7204,943 Sieam Used by Stoker.—The estimated weight of steamused by the stoker ranged between 393 and 1,629 lb. perhour, and was about two per cent of the steam generated bythe boiler. There was more hooking or leveling of the firein hand firing than when the stoker was used. This wouldindicate that the stoker maintained a more nearly level firethan could be obtained by hand firing.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
