Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ..-- . Ill] Congress of Applied Chemistry 143 the height of the cupolas and other factors varied considerablyit is natural that there should be some irregularity. On thewhole, however, there is a marked increase in temperature withincreased rate of blowing. Figure 5. shows graphically the approximate relationship ofheat loss, sensible and potential, to rate of blowing. The curvesare calculated from the preceding data, which, however, are tooscanty to give very reliable results. Incidentally it
Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ..-- . Ill] Congress of Applied Chemistry 143 the height of the cupolas and other factors varied considerablyit is natural that there should be some irregularity. On thewhole, however, there is a marked increase in temperature withincreased rate of blowing. Figure 5. shows graphically the approximate relationship ofheat loss, sensible and potential, to rate of blowing. The curvesare calculated from the preceding data, which, however, are tooscanty to give very reliable results. Incidentally it may bestated that from 25 to 30 pounds of air per square foot of cupola. area per minute has been found by experience to be the mostadvantageous rate of blowing all things considered. Within recent years there have been five principal proposalsmade with a view to fuel economy in cupola operation. Theseare, increased height of cupola, a second row of tuyeres, heatedblast, and dry blast the Balhot heat recovery cupola. The first of these, increased height of cupola, has been shownto rest upon a sound theoretical basis, while the results of prac-tice indicate that it accompHshes the results desired. Thequantitative relation between increase in height and fuel savingdoes not, however, seem to have been determined. A second row of tuyeres is supposed to effect the more completecombustion of the carbon by the addition of oxygen at a point 144 Original Communications: Eighth International [vol. where it can burn the CO. Theoretically this appears to be anexcellent idea, but actually it usually fails to accomphsh theresult desired, to materially decrease the
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