. Bulletin. than coal containing fine material or coal of mixed sizes. Sized coal and screened lump coal usually cost more than coalcontaining fine material. Which is the more economical dependslargely upon the price. In general, if the price difference is small, theadvantages mentioned make the screened coal quite as economical asthe cheaper unscreened coal, otherwise the reverse is true. In manyheaters having insufficient draft the screened coal will be found themore economical. 1 PURCHASE AND USE OF COAL FOR HEATING HOMES 47 Draft Control for Illinois Coal.—In order to operate anysystem of
. Bulletin. than coal containing fine material or coal of mixed sizes. Sized coal and screened lump coal usually cost more than coalcontaining fine material. Which is the more economical dependslargely upon the price. In general, if the price difference is small, theadvantages mentioned make the screened coal quite as economical asthe cheaper unscreened coal, otherwise the reverse is true. In manyheaters having insufficient draft the screened coal will be found themore economical. 1 PURCHASE AND USE OF COAL FOR HEATING HOMES 47 Draft Control for Illinois Coal.—In order to operate anysystem of heater drafts, successfully the householder must understandcertain fundamental facts. (1) Due to the suction or draft action produced by a good chim-ney there is a constant tendency for air to enter any opening into theash pit, combustion chamber, or smoke pipe of a house heater. It is,therefore, necessary to have all such openings controlled by tight-fitting dampers in order to regulate the air Fig. 20. First Stage of the Coking Method of Firing, in Which Fresh Coal Is Spread Over Only a Portion of the Fire Bed, and the Eemaining Portion of the Fire Is Glowing Brightly, so That the Combustible Gases Arising from the Fresh Fuel May Be Quickly Ignited and Burned (2) Air must be supplied in varying quantities, ranging throughwide limits, in order to burn fuel economically. With Illinois coalthis variation in amount of air required is large and requires carefulattention. It is greatest soon after firing, from which time it should begradually decreased until the next charge is fired. (3) Air may be supplied either above (through fire door, Fig. 3, \ 48 ILLINOIS ENGINEERING EXPERIMENT STATION or through special slots or ports) or below (through ash pit door—Pig. 3) the burning fuel bed, and sometimes both above and belowthe bed. Immediately after firing soft coal, when the most air isneeded, some air must enter above the fuel bed in order to burn thelarge amount of vo
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectenginee, bookyear1904
