Technical paper . Test 72Rate, 3 pounds \ \ / 12 \1 \ / A .o* (V)\€ i 8 / \ V i<& a\c o«^ f V s / \ 7s \ /f V ^ 1 \ . 1 \ \ 02 ^ - \ i C i 2 i 4 5 6 1 i 9 ] 0 ] 1 1 2 DISTANCE FROM SURFACE OF GRATE, INCHES Figure of gases and temperature in 6-inch fuel bed of anthracite coal in a hand-firedexperimental furnace. Rates of combustion, 10,6, and 3 pounds of fuel per square foot of grate per hour. parison of figures 4 to 10 with similar figures in Technical Paper a 6-inch fuel bed, the oxygen in the air supplied through the a Kreisinger, Henry, Ovitz, F. K., and Augustin
Technical paper . Test 72Rate, 3 pounds \ \ / 12 \1 \ / A .o* (V)\€ i 8 / \ V i<& a\c o«^ f V s / \ 7s \ /f V ^ 1 \ . 1 \ \ 02 ^ - \ i C i 2 i 4 5 6 1 i 9 ] 0 ] 1 1 2 DISTANCE FROM SURFACE OF GRATE, INCHES Figure of gases and temperature in 6-inch fuel bed of anthracite coal in a hand-firedexperimental furnace. Rates of combustion, 10,6, and 3 pounds of fuel per square foot of grate per hour. parison of figures 4 to 10 with similar figures in Technical Paper a 6-inch fuel bed, the oxygen in the air supplied through the a Kreisinger, Henry, Ovitz, F. K., and Augustine, C. £., Combustion in the fuel bed of hand-fired fur-naces: Tech. Paper 137, Bureau of Mines, 1916, pp. 39-44. RESULTS OF TESTS OF GROUP 1. 27 grate is almost all used up in the lowest 3 inches of the fuel bed byburning the carbon of the coal to C02, only a comparatively smallpercentage of CO being formed. At this point the C02 content ofthe gases rising through the fuel bed reaches a maximum of 14 to 16. 3456789 10DISTANCE FROM SURFACE OF GRATE, INCHES 11 12 FmuRE 7.—Composition of gases and temperature in 12-inch fuel bed of anthracite coal in a hand-firedexperimental furnace. Rates of combustion, 10,6, and 3 pounds of fuel per square foot of grate pec hour. per ccMit. As the gases flow through the upper layers of the fuel bedthe percentage of C02 drops and the percentage of CO increases rap-idly. This change indicates that as long as there is free oxygen thecarbon is oxidized to C02, but when the oxygen is used up, the COa 28 LOW-RATE COMBUSTION IN FUEL BEDS. acts as an oxidizing agent and is reduced to CO, which increasestwice as rapidly as C02 disappears. The zone of reduction of C02extends to near the surface of the fuel bed. Just within the top of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
