. Electric railway journal . nspicuous difference between the new stoker andthe usual underfeed type is that it has moving fuel-bearinggrates in place of stationary tuyeres, and moving overfeedgrates extending across the entire width of the moving grates carry the fuel down an incline ofabout 20 deg. The positively forced feed, made up of thecombined motion of a plunger in the retort and the movinggrates, distributes the coal evenly. The nearly uniformthickness of fuel insures active combustion over the wholefire surface by providing a much freer and more uniformpassage of air th
. Electric railway journal . nspicuous difference between the new stoker andthe usual underfeed type is that it has moving fuel-bearinggrates in place of stationary tuyeres, and moving overfeedgrates extending across the entire width of the moving grates carry the fuel down an incline ofabout 20 deg. The positively forced feed, made up of thecombined motion of a plunger in the retort and the movinggrates, distributes the coal evenly. The nearly uniformthickness of fuel insures active combustion over the wholefire surface by providing a much freer and more uniformpassage of air through the coal than is possible when thecoal heaps in large masses with adjacent thin spots. The discharge of refuse is continual and automatic, notperiodic, thus avoiding the discharge of large masses offuel with the refuse. At the lower end of the overfeedgrates are pusher noses which force the refuse slowly butcontinuously toward the bridge, then on and over the ash-supporting plates, which are hinged together in the form. New Underfeed Stoker—Sectional Side View of an apron. The plates of this apron hang down over theends of a rack which controls the size of the opening andis adjustable by hand power. The discharge capacity canbe regulated by the amount of travel given to the pushernoses. The discharge of refuse is at such a rate that thefuel is thoroughly burned out and practically cold beforedischarge. The new stoker is reported to be able to break up allclinkers. The continual reciprocating motion of the mov-ing grates, which is in opposite directions for adjacentretorts, forms a shearing line between each pair. Thisaction prevents the formation of clinkers above the airopenings. The crusher action of the pusher noses at thebottom of the overfeed grates is effective in preventing the
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