414 / 2018-07-27 15:34:59

The Aldehydes/Ketones Emission and Properties Variation of Oxidative Torrefied Sawdust during Storage

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Oxidative torrefaction in continuous reactor has been developed as a thermal pre-treatment to improve the qualities of solid fuel, including moisture absorption, heating value, density and hardness, etc. However, the emission of aldehydes and ketones have to be investigated at mechanism level to reduce the chronic damage to industrial workers and customers during storage. In the present work, the relationship between the aldehydes/ketones emission and the physic-chemical properties of oxidative torrefied sawdust (treated by slot-rectangular spouted bed reactor) were discussed during heat-humid hemi-sealed storage. The variation of color value and the weight loss of torrefied sawdust during storage had multi-linear correlation with aldehydes/ketones emission. Oxidative torrefaction with higher severity (higher torrefied temperature, faster feed rate and higher oxygen concentration) could reduce VOCs’ emission during storage, associated with sawdust of fatty acids content. The biomass residues oxidatively torrefied in a slot-rectangular spouted-bed reactor could be alternative solid biomass fuel in industrial scale to compatible with the quality of products and the health level of working condition.