OCR Text |
Show Figure 3: Influence of pyrrolic coal nitrogen on the release of H C N and C H 3 C N from five coals during devolatilisation at 1273 K amount evolved / g coal (arbitary units) 0.06 T HCN CH3CN 40 45 50 55 % Pyrrolic N 60 65 Figure 4: predicted (solid) and observed (open) products from devolatilisation of coals of varying rank (104 K/s to 1273 K) (a) char-N, tar-N, H C N and N H 3 (b) char, tar and gas yields percent of coal nitrogen 70 60 50 40 30 20 10 0- < ' L^ | ^H • C i X 1 0 n~ 1 l I K-• T0T * _H HN 0 char Lai Mr] (a) 70 percent yield 70 60 50 40 30 20 10 0 75 80 85 Carbon content (daf wt%) 90 • l^vs" • * I < • i A m ii • 1 1 1 * 1 - 0 < • • - :ha tr (b) i tar ga< 1 1 70 75 80 Carbon content (daf wt%) 85 90 15 |