Characteristics of Biomass Gasification in Flue Gas by Thermo–Gravimetry–Fourier Transform Infrared Spectrometer (TG –FTIR) Analysis

Abstract

Biomass renewable energy sources are widely applied to the process of power generation and heat production. In this paper, the effect of the different heating rate (20, 50, 70 °C/min) on the thermal weight loss process of peanut shell briquette is studied by TG-FTIR (Thermo–gravimetry–Fourier transform infrared spectrometer) method which the gasifying agent is selected by waste flue gas produced from pyrolysis gas combustion. The results show that the pre-pyrolysis water loss stage of peanut shell briquette is below 160 °C such thermal weight loss. The thermal oxidation reaction occurred at 160 - 750 °C for the pyrolysis stage. The coke gasification stage at 750 °C, the coke and CO₂ reduction reaction has CO precipitation under high temperature. The pyrolysis kinetics is investigated by Friedman method and DAEM (distributed activation energy model). When the conversion ratio is below 0.25, it is less than 170 kJ/mol of the activation energy. when the conversion ratio is 0.25 – 0.7, the activation energy ranges between 170 and 205 kJ/mol. The result is that the pyrolytic gaseous products are CO₂, CO, CH₄ and other low molecular hydrocarbons by FTIR method at real-time analysis. The CO₂ has the highest absorbance in pyrolytic gaseous products. At the same time, the absorption peak of CO occurred at 750 – 850 °C.