Bulletin . ture increaseper minute, ° C. 5 and2a. Differences, ° C. 5 and 2and 5. 5 and 2andlC. 5 and 2and 20. 5 and10. 5 and20. 10 and20. 104. Average. 1,123 1,137 1,1951,218 1,2511,3361,3571,3581,4071,5061,5091,531 1,120 1,141 1,2011,2351,2731,3531,3791,3731,4121,4961,5071,496 1,118 1,112 1,1991,2521,2821,3641,3691,3751,4071,5181,5181,496 + 3 - 4 - 6-17-22-17-22-15 - 7+ 10+ 2+35 + 5 +25 - 4-34-31-28-12-17 0-12 - 9+35 -59 - 1-50-38-41-20-28-16+ 9+ 12-11 + 2 + 29 + 2-17 - 9-11+ 10 - 2+ 5-22-11 0 + 21 -55 + 5-33-16-24 + 2-13-11- 1+ 10-46 -18 - 2 + 19 -84 +
Bulletin . ture increaseper minute, ° C. 5 and2a. Differences, ° C. 5 and 2and 5. 5 and 2andlC. 5 and 2and 20. 5 and10. 5 and20. 10 and20. 104. Average. 1,123 1,137 1,1951,218 1,2511,3361,3571,3581,4071,5061,5091,531 1,120 1,141 1,2011,2351,2731,3531,3791,3731,4121,4961,5071,496 1,118 1,112 1,1991,2521,2821,3641,3691,3751,4071,5181,5181,496 + 3 - 4 - 6-17-22-17-22-15 - 7+ 10+ 2+35 + 5 +25 - 4-34-31-28-12-17 0-12 - 9+35 -59 - 1-50-38-41-20-28-16+ 9+ 12-11 + 2 + 29 + 2-17 - 9-11+ 10 - 2+ 5-22-11 0 + 21 -55 + 5-33-16-24 + 2-13-11- 1+ 10-46 -18 - 2 + 19 -84 + 3-16 - 7-13 - 8-11-16+21+21-46 -13i | -Hi 5° C. per minute until initial deformation of cone; then 2° C. per minute. 108 FUSIBILITY OF COAL ASH. DETERMINATION OF FLUID TEMPERATURE. That the softening temperature of an ash. without any otherinformation as to the change of viscosity of the mixture with tem-perature, must necessarily be a rather inadequate indication of prob- 1550 1450 31350 1250 1150 1050. 104 105 lus 109 110 75 107 80 74 67 ASH NUMBERFiguue 38.—Curves showing temperatures of initial deformation and softening and fluidtemperatures of 12 ashes in No. 3 melters furnace. able clinkering properties has been generally recognized by mostinvestigators who have studied this subject. Some ashes melt to acomparatively fluid slag in a short temperature range, 10° to 20° C.;others soften very slowly, there being an interval of 50° to 150° C. FUSIBILITY OF COAL ASH AS DETERMINED IN GAS FURNACE. 109 between the initial deformation of the cone and its final softeningpoint. This temperature range has been termed by the authors the softening interval. It is believed that the length of the softeninginterval, when considered with the softening point, will ultimatelybe proved to have some connection to clinker formation. Further-more, at the softening temperature the fusing ash is yet in a pastyand viscous condition; the fusion process has not reached the pointwhere the sl
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