Heteroatom distribution in pyrolysis products as a function of heating rate and pressure

Gas evolution characteristics during pyrolysis and catalytic pyrolysis of coals by TG–MS and in a high-frequency furnace

“…Tables 9 and 10 also indicate that for the same coal sample, char yield of fast heating is lower than that of slowing heating. In other words, fast pyrolysis could enhance the release of volatiles, which is consistent with Cai et al's results [31]. Compared to slow heating pyrolysis, rapid pyrolysis owned higher total amounts of volatiles, and lower amounts of light gas species.…”

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

“…During pyrolysis, part of the fuel bound nitrogen (FBN) is released with the devolatilizing gases while the remainder is retained in the solid char to be released during subsequent gasification/combustion of the char [165,166]. The allocation of fuel-N to volatiles and char is dictated by temperature [160,[167][168][169][170], particle size [168], fuel type [160], residence time [168,170], heating rate [171], and pressure [171]. Temperature, fuel type, and particle size, are the dominant factors in this allocation while heating rate and pressure only have a minor effect.…”

NOx EMISSIONS PRODUCED WITH COMBUSTION OF POWDER RIVER BASIN COAL IN A UTILITY BOILER

“…Wang et al 1996 estimate that 60 to 90% of the NOX left after installation of Iow-NOX burners originates from the char-N component. Cai et al 1993 say the same, estimating 60 to 95% of NO originates from cnar-N when using 1ow-NOX burners. This compares with 60 to 80$%0 NOX emissions derived from gas phase reactions when Iow-NOX burner technology is not used during pulverized coal combustion ).…”

“…Unlike thermal and prompt NOX, coal nitrogen NOX can form at temperatures as low as 700°C ( 1292°F). Cai et al 1993 (Kambara et al 1995) that it produces mostly char-N and HCN and possibly some NH3.…”