Pyrolysis characteristics and gaseous products of bamboo shoot shells under N2 and CO2 atmospheres

Abstract

To design industrial thermal conversion systems of bamboo shoot shells (BSS), pyrolysis characteristics of BSS under N2 and CO2 atmospheres were investigated using thermogravimetric analysis coupled with a Fourier-transform infrared. Kissinger-Akahira-Sunose and Flynn-Wall-Ozawa methods were used to calculate kinetic parameters. Thermodynamics were evaluated based on Enthalpy, Gibbs free energy and entropy. Results showed that BSS pyrolysis under CO2 atmosphere had an obvious peak at the temperature range of 645–922 °C. CO2 decreased residual weight and average Eα of BSS pyrolysis, and improved the release of gaseous products. CO was the main gaseous product during pyrolysis process of BSS under CO2 atmosphere. The release of CO2 and CH4 reduced. BSS pyrolysis under N2 atmosphere and the first peak under CO2 atmosphere fitted with R2, R3, and A2 models when α increased from 0.1 to 0.5 and subsequently followed F2 model. Pyrolysis reaction of BSS was non-spontaneous and required an external heat supply.