The analysis of fuel, gas, water, and lubricants . y upon a number of topicsrelating to good efficiencies in combustion, only a few of whichcan be referred to here. »Bement, a., Jour. Western Soc. Eng., vol. 13, 2, pp. 209-282,April, 1908. Breckenridge, L. p., Univ. of 111. Eng. Exp. Sta. Bxdl. No. 15, 1907.« U. S. Bureau of Mines, BuU. 135, 1917. COMBUSTION OF COAL 67 Smoke.—It is evident from the preceding discussion thatsmoke reduction depends upon (a) admission of air above thefuel bed, (6) thorough mixing, and (c) the maintenance of a tem-perature above the ignition point of the gases and
The analysis of fuel, gas, water, and lubricants . y upon a number of topicsrelating to good efficiencies in combustion, only a few of whichcan be referred to here. »Bement, a., Jour. Western Soc. Eng., vol. 13, 2, pp. 209-282,April, 1908. Breckenridge, L. p., Univ. of 111. Eng. Exp. Sta. Bxdl. No. 15, 1907.« U. S. Bureau of Mines, BuU. 135, 1917. COMBUSTION OF COAL 67 Smoke.—It is evident from the preceding discussion thatsmoke reduction depends upon (a) admission of air above thefuel bed, (6) thorough mixing, and (c) the maintenance of a tem-perature above the ignition point of the gases and vapors on the part of any one of these three conditions willresult in smoke where bituminous coal is being burned. Inhouse-heating appliances only the first condition, (a), can beemployed to any practical degree and this especially under theconditions of intermittent firing is for all practical purposes,substantially lacking. Hence, as a general statement, it may besaid that all house-heating appliances produce smoke. In the. Fig. 16.—Stoker boiler, showing tile baffling. aggregate this is more than that produced by factories and smallestablishments combined. In the case of large installations the conditions under (a) and(6) are the most readily provided through the use of stokerswhich avoid the intermittent conditions which accompany handfiring. A steady accession of fuel results in a uniform dischargeof volatile combustible, which can be met with reasonable accu-racy by a definite admission of air above the fuel. Varying loadsand varying draft pressures however complicate the problem. The most difficult condition of all to meet is that under (c) or(b) and (c) combined. The ignition temperature of the morecommon gases discharged into the combustion chamber such as 68 FUEL, GAS, WATER AND LUBRICATION methane, for example, is from 650 to 750°C. or a mean of 700°C.(1,300°F.) and for hydrogen it has an average ignition tempera-ture of 585°C. or l,085°F
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectchemist, bookyear1922
