Abstract
Wet torrefaction (WT) pretreatment coupled with pyrolysis technology is proposed for improving the fuel properties of camel dung (CD) and regulating NOx emissions from thermal utilization. The fuel ratio, HHV and energy density of CD were significantly enhanced with the WT temperature. Especially, WTC-270 realized the highest energy yield (75.87%), energy-mass synergy efficiency index (EMCI, 19.27%), and the best thermal stability during pyrolysis. Besides, WT pretreatment elevated the release of H2 and CH4 and reduced H2O and CO2 during pyrolysis, apparently. Surprisingly, fewer gaseous pollutants were produced during pyrolysis, ascribing to nitrogen removal and nitrogen functionality stabilization by WT. Notably, NOx and NO emissions from WTC-270 pyrolysis were reduced by 84.6% and almost 100% compared to the CD. Overall, this study provided helpful guidance on the clean utilization and energy production of CD, as well as emission control of gaseous pollutants during energy utilization.
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