Coal devolatilization during rapid transient heating. 1. Primary devolatilization

Pyrolysis of superfine pulverized coal. Part 2. Mechanisms of carbon monoxide formation

“…Therefore, the decomposition of these tar-O structures leads to a rapid release of CO around 600°C, when the tar evolution ceases. Niksa and co-workers [12,35] draw the similar conclusion that there was a surge of CO evolution after the end of the tar formation, which was due to the secondary volatiles pyrolysis. Furthermore, it is interesting to notice that the slopes of the envelop CO evolution curves of SH coals during the stage three are all larger than those of NMG coals.…”

Meteors Do Not Break Exogenous Organic Molecules into High Yields of Diatomics

“…Coalbound nitrogen also resides principally in heterocyclic ring moieties, mostly five-membered pyrrolic rings and six-membered pyridinic rings (Smith et al, 1994;Zhang, 2001). In pyrolysis studies of tar such nitrogen is observed to escape, predominantly in the form of HCN and NH 3 (Chen and Niksa, 1992;Nelson et al, 1992;Ledesma et al, 1998). Ammonia is a product of amino compounds.…”

96/05282 Nitrogen release during coal combustion

“…Most of these studies indicate that nitrogen mass loss is proportional to, but different from, overall dry ash-free (daf) mass loss, being smaller by a factor of 1.2 to 1.5 [Blair, et al, 1976;Pohl and Sarofim, 1976a;Pohl and Sarofim, 1976bl. The percentage of nitrogen evolved during pyrolysis was shown to increase significantly with pyrolysis temperature [Blair, et al, 1976;Song, et al, 19821. Experiments in which particles were heated up to 1000 K indicate tar is the primary means of nitrogen release from coal [Chen and Niksa, 1992a;Chen and Niksa, 1992bl. As particle temperature further increases in an inert environment, fractional nitrogen loss approaches unity while mass loss plateaus at less than unity [Blair, et al, 1976;Pohl and Sarofim, 1976bl.…”