Energy requirements to produce fine powders of raw and torrefied wood at pilot scale, and characterization of their flowability

This work aims at comparing different preparation chains to produce wood powders suitable for further gasification in an entrained flow reactor. Three powders, with particle size below 1 mm, have been produced pilot scale from resinous chips: a powder of raw and torrefied both ground knife mill, vibration mill. The respective requirements energy feedstock material resource determined each chain production. production the requires 0.83 MWh per ton dry (tdp). additional grinding step vibrating mill adds 0.63 MWhel.tdp−1. 3.56 MWh.tdp−1. Moreover, wet chips vary 2.5 tons without torrefaction 4.4 including step. In latter, highest demand is gas-cleaning instrumented post-combustion Heat recovery combustion gases could supply drying steps. It would reduce by half total cost chain, down 1.66 be reduced 3.2 tons. morphology flowability investigated compared. Torrefaction or milling significantly improve ability any stress when consolidated vertical stress.