. Bulletin . 0123 AT A TEMPERATURE OF 1,000° C.[h= fc2= ] CO 0 AT A TEMPERATURE OF 1,100° C.[fcp= fc2= ] CO 0 Since - = -=, when I, the length of the charcoal column, is equal to Z t 1, that is, equal to th
. Bulletin . 0123 AT A TEMPERATURE OF 1,000° C.[h= fc2= ] CO 0 AT A TEMPERATURE OF 1,100° C.[fcp= fc2= ] CO 0 Since - = -=, when I, the length of the charcoal column, is equal to Z t 1, that is, equal to the unit of length, then the numbers along the—axis give the velocity of gas in terms of the same unit of length and 12 FACTORS IX THE FORMATION OF PRODUCER GAS. seconds. For example, the length of the charcoal column in the ex-periments here recorded was approximately 25 cm., or 10 inches. The velocity corresponding to the point - = 1, at the extreme right of fig-ure 3, is, therefore, 10 inches per VELOCITY OF GAS DIVIDED BY LENGTH OF CHARCOAL COLUMN /=^=J-\ Figure 3.—Variation of percentage of CO formed from C02 and charcoal with change of gas velocity. The curves through the points in the figure have not been arbitra-rily drawn, but have been plotted from a mathematical equation, which expresses the percentage of CO as a function of -. (See Dis-cussion of physical-chemical principles.) The general shape of all the I 1 1 zrcr 1 / « O [ / S 3CJ ^ ?ol ZL TIME OF CONTACT IN SECONDS Figure 4.—Variation of percentage of CO formed from C02 and charcoal with change of time of contact. curves in figure 3 is the same. The percentage of CO is greatest atzero velocity/ - = 0, £= oo J. With increasing values of - each curve falls away at first slowly, then more rapidly, passing a point of inflec-tion, and, finally, becoming nearly horizontal. The intersectionsof the curves with the CO axis give the percentage
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