COMPLETE MASS AND ENTHALPY BALANCES OF BIOMASS PYROLYSIS AT HIGH REACTOR TEMPERATURE

摘要

This paper describes mass and enthalpy balances for wood chips pyrolysis experiments performed in atubular reactor at high reactor wall temperature (700-1000 ℃), with quantified solid heating rates (20-40 ℃ s~(-1)) and gas-phase thermal severity. These pyrolysis conditions are closed to ones occurring in a dual fluidized bed gasifierwith a particle thickness of around 5mm. Permanent gases (H_2, CO, CH_4, CO_2, C2H4, C2H6), water, aromatic tar (10compounds from benzene to phenanthrene and phenols), and char were quantified thanks to a multi-analyticalapproach (GC/MS, GC/TCD, Karl Fischer, etc.). Mass balances range from 92% (700℃) to 102% (800℃) andenthalpy balances from 86% (700℃) to 101% (800℃). Char yields decrease from 16.5% (700℃) to 13.3%(1000℃). Quantified tars account for less than 4.5% on mass basis and for 9% of the initial enthalpy of wood.