. American engineer and railroad journal . aft. The reason that both natural exhaust draft and forced draftare used is that both were required with the stoker as in-stalled in order to obtain the desired working efficiency lbs. of water evaporated per pound of combustible. Thespecifications call for an exhaust suction above the gratewhich would produce a %-in. difference of level in a U-tube,and a forced draft pressure below the grate sufiScient to pro-duce a difference of level of 1 in. in a U-tube. In a test that was made shortly after the boilers were placed intoservice, a performanc
. American engineer and railroad journal . aft. The reason that both natural exhaust draft and forced draftare used is that both were required with the stoker as in-stalled in order to obtain the desired working efficiency lbs. of water evaporated per pound of combustible. Thespecifications call for an exhaust suction above the gratewhich would produce a %-in. difference of level in a U-tube,and a forced draft pressure below the grate sufiScient to pro-duce a difference of level of 1 in. in a U-tube. In a test that was made shortly after the boilers were placed intoservice, a performance was shown of lbs. of water evapor-ated per pound of combustible with the regular coal, showingunder analysis per cent, of refuse and per cent, ofmoisture, and with an exhaust draft above the grate of 7-32 in.(U-tube) and a forced draft below of 9-32-in- (U-tube), thesteam pressure averaging only 140 lbs. and the boilers work-ing under only an per cent, is stored in a series of elevated hopper bins, of 300. VIEW IN UOILEp ROOM. THE VEKTUAL AND TIIKRELATIVE LOCATIONS OF THE TWO 16-IN. STEAM HEADERS. tons capacity, located above the fire room, from which it isdelivered direct to the stokers by chutes, as shown in thecross section and also in the view of the boilers. The binsare of built-up steel construction and are supported partiallyfrom the side wall and partially from the roof trusses, whichare extra heavy; this frees the fire room of obstructions. Thecoal is delivered into the bins by a conveyor system of acapacity of 100 tons per hour, which carries it from the re-ceiving pit under the track at the east side of the building anddistributes it, in connection with a scraper conveyor above thepockets, into any desired bin. The coal used is a buckwheatgrade, containing about 20 per cent, of ash. The ash conveyor system is entirely separate from that forthe coal; it consists of a scraper line leading through the ashtunnel unde
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
