The analysis of fuel, gas, water, and lubricants . Fig. 17.—Sectional view of stoker and boiler. never exceeds 200°C., (425°F.) at 300-lb. gage pressure.^ Amongthe more common methods for securing the necessary tempera-tures are those which provide a longer combustion may be secured horizontally, as in the tile baffling of the 1 Dixon and Coward, Jour. Chem. See, vol. 95, p. 519, Marks and , Steam Tables, Longmans, Green Co. COMBUSTION OF COAL 69 lower flues, Fig. 16, or by elevating the boiler above the fuel bed asshown in Fig. 17, where the extreme height between
The analysis of fuel, gas, water, and lubricants . Fig. 17.—Sectional view of stoker and boiler. never exceeds 200°C., (425°F.) at 300-lb. gage pressure.^ Amongthe more common methods for securing the necessary tempera-tures are those which provide a longer combustion may be secured horizontally, as in the tile baffling of the 1 Dixon and Coward, Jour. Chem. See, vol. 95, p. 519, Marks and , Steam Tables, Longmans, Green Co. COMBUSTION OF COAL 69 lower flues, Fig. 16, or by elevating the boiler above the fuel bed asshown in Fig. 17, where the extreme height between the fire andflues may average as much as 15 ft. A good illustration isshown in Fig. 18 of the effect of cooling the gases discharged fromthe fuel bed below the temperature of ignition before combustionis Fig. 18.—Stoker and boiler, showing effect of cooling the gases below theirignition temperatures. Clinker Formation.—The worst enemy of efficiency in theburning of bituminous coal is any condition of fusion or cementa-tion of the constituents of the fuel bed in such a manner as toimpede or block off the passage of air and products of combustionthrough the mass. The organic matter of some coals has atendency to fuse readily or **cake, but this property, to theextent of interfering with the free burning of coals of theIllinois type, is not of a serious nature. A much more difficultproblem resides in the tendency of these coals to , in the ordinary sense, is the fusion of the inorganic orash constituents of the coal into masses that interfere with thefree access of air. Under normal conditions, from 10 to 25 percent of the total combustible is discharged into the combustionchamber for burning above the fuel bed. The formation ofclinker tends to greatly increase this ra
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectchemist, bookyear1922
