In-situ Measurement of CO2 Column Density and Flame Temperature of Single Biomass Particle Combustion by Laser Absorption Spectroscopy
The measurement of the combus-tion characteristics of a single biomass particle is essential for studying massive biofuel energy conversion process;however,it is challenging due to the small physical scale of the biomass par-ticle flame.In this work,we re-port an investigation of the com-bustion behavior of single lignin and single cellulose particle through CO2 absorption spectroscopy and high-speed photography.The biomass samples are prepared with an initial diameter of about 1.0 mm and are ignited on a heating plate placed inside a multi-pass absorption cell.The shape and size transformation of single biomass parti-cle are recorded through high-speed photography,and the combustion temperature and CO2 column densities are measured through laser absorption spectroscopy at 4.172 μm.We find that the maximum combustion temperatures are 1662±38 K and 1569±26 K for lignin and cellulose particle,respectively.Besides,we find that CO2 generation precedes the generation of visible volatile flame for cellulose particle.While for lignin particle,the CO2 generation is found to be almost at the same time as its volatile combustion stage begins.The measure-ment technique and results presented in this work are of practical interest for biomass com-bustion studies and are meaningful for the development of biomass thermal conversion mode.
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