OCR Text |
Show tv 1.0 ~ o ~ 0.4 ~ \- K(y ILLINOIS HOCKING PITTSBU~ 0.6 a: :::> co z :::> z 0.2 oco a::: ~ o 0.1 L.J x L:: ~0.06 ~0.04 i= u ~ 1.- :;," 0.02 ~ t-l- I- -- ~ ~ ~ - ~ ~ ~ t- 0.0 1..- 0.00 6 0.004 l- I- ~ o FIGURE 8. ~~ 0- -41.& 6--41-4 0--42.2 .- 51.8 .- 55.8 D- SI.8 .-&0.0 11- &5.0 .- 71.0 .- 75.4 11-7S.0 .... ~ y- 80.8 m- 0 r~~ "'8S.0 A- 83.4 .- 85.2 NUt.CBERS ARE PERC(NT THROUGH 200-t.£SH - ....... C- S.9 C -6.5 C-6.2 ~ 8j -31 8j-7 ej -4 0 C) :~ • ~ .... • "6 .~ • • & • ~ • ~ ~ • ct • • • ........... ~ "" ~ ... p 5 10 15 20 25 30 35 40 ce / I. SHERMAN'S DATA FOR HOCKIN~ ILLINOIS, AND PITTSBURGH COALS, PLOTTED ON COORDINATES OF UNBURNED ~'IXED CARBON (LoG SCALE) va. C8/X1# (Correlation with curve for m - 0, n - 1.5) Figure 1. Figure from the paper by H. C. Hottel and I. McC. Stewart, entitled "Space Requirement for the Combustion of Pulverized Coal" which appeared in Industrial and Engineering Chemistry, May 1940, Volume 32, pages. 719-730. The figure shows the fraction of fixed carbon in the fuel remaining unburned, U, at the furnace exit as a function of the dimensionless group, CO/xw. The variable C contains an effective rate coefficient, the ratio of char to coal particle size, char density, and the power of particle size, m, in the burning law; e is time; and Xw is a weighted-mean size of pulverized coal. The parameter, n, is from the Rosin and Rammler cumulative particle size distribution, R = exp( -bxn). |