OCR Text |
Show -.o~... u -ro ro .~......-.. .- C > Q) (3 C ro 0 Q) 0- cr: >< Q) Q) ro ~ .Ll0- °u (!J Q) N ro E ~ o C Figure 5. -(/) (/) ro .Ll ~ ro ~ -u C 0 (/) ~ Q) > C 0 () C 0 .Ll ~ ro () Figure 6 19 1 .·------·····- --·. ··f··············.···°; ...... . ·······r··················,················ ··· ··· ····· .. ........ {.................. 1 0.8 .............. ..... -..••..... ....... .. -.................. -... ........... " ~ """""" " " "- """"""" " " , ................. . 0 .8 0.6 ................ ... ~ .................. , .................. -... ............... ~ ..... ........ ... - ................ -................. . 0.6 0.4 ............. ___._ _ ~ ... _.. __ .......... ~ . _____ .... _. __.. .. i ......... ..... __ ~ .... ___ .. _.. .... __~ _ ...... ___ .... __._ i __ ............_ - 0 .4 0.2 ................. _.. ........... . -..- ........... -... ~- ........ -..... -.. ~ .. ... --.-... -..... ..; .. .. ....... _- -_ .... .;.. . - .. ... __ . . . ... .. . 0.2 o 4-~~~~~~~~~~~~~~~~~~~~0 47 57 67 77 87 97 107 117 Residence Time (msec) C C 0 o-e .Ll ro ~ u () ro U ::::I Q)U ~ Q) (/) U Q) ~ ~ -o Q) o ~.... ~ ~ o,.Ll Cu Q) Q) ....J N ro ro .o... E~ .- 0 C -l-iB Char global reactivity (_ ) and ordered carbon content (e ) as a function of residence time for partially-combusted Illinois #6 coal chars samples from the Sandia entrained flow reactor. 0% 50% 70% \ \ \ 90% \ \ \ distributed 95% , \ , , uniform , reactivity 99% , 0 200 400 600 800 1000 Time (msec) Comparison of carbon burnout behavior predicted by the uniform and distributed reactivity models. Sample: Pocahontas #3 coal char, initial particle diameter 100 Jlm. Combustion in 12 mole-% oxygen, 1500 K. |