This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...itself to obtain the space and time needed by the gas-currents for complete intermixture and thorough combustion, or it may be any separate chamber beyond the grate. The latter is often the best method of securing the desired results; but the more usual plan is that of giving considerable height of furnace-crown. Grate ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...itself to obtain the space and time needed by the gas-currents for complete intermixture and thorough combustion, or it may be any separate chamber beyond the grate. The latter is often the best method of securing the desired results; but the more usual plan is that of giving considerable height of furnace-crown. Grate-bars are spaced differently for different kinds of fuel. Thus, for fine " pea" anthracite coal, the spaces between the bars are usually made about a quarter of an inch (0.6 cm.); for "chestnut," inch (0.9 cm.); for "stove" coal, inch (1.27 cm.); and for large anthracite and for bituminous coals, to inch (0.95 to 1.9 cm.); while wood-burning calls for an inch (2.56 cm.). 160. The Relative Areas of Chimney, Flues, and Grate are seen to be variable with the circumstances under which the boiler is to be operated, but with natural draught and usual working conditions certain proportions have become almost universally accepted as standard in common practice. Thus it may be taken as well settled by experience, that in chimneys of circular section, smooth internal surfaces, and in the open, where draught is unobstructed by air-currents produced by surrounding objects, as, for example, with marine steam-boilers, the minimum ratio of chimney-flue section, section through the tubes and that over the bridge-wall to grate-surface should be, at least, respectively, while a maximum to be adopted with forced draught is not far from 4, and, for anthracite coal. The latter ratios will also work well for bituminous, freeburning, coals and natural draught; and the sections may often be made still greater, with advantage when a blast is also used with such fuel. With restricted draught-area the amount of fuel that m...
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