A comprehensive study on co-pyrolysis of bituminous coal and pine sawdust using TG

Abstract

A sample consisting of woody biomass and bituminous coal was pyrolyzed in a lab-scale furnace in a nitrogen atmosphere with the temperature increasing by different heating rates of 5, 10, and 50°C min -1 until the furnace wall temperature reached 900°C. Five blending ratios (BRs) of coal-biomass were tested. For each BR, the mass loss of the sample and mole fractions of the gaseous species evolved from the sample were measured using a thermogravimetry (TG) and a real-time gas analyzer (GA). Reactivity, product yield, and activation energy were considered as index parameters to co-pyrolysis. While synergy (the difference between the experimental data and calculated results obtained using an additive model) of the reactivity of co-pyrolysis was observed only at specific temperatures, the TG results showed synergy at temperatures between 450 and 500°C compared to between 450 and 600°C seen with the GA method for all pyrolyzed gases, and especially between 350 and 650°C for H 2 . While there was no synergy in the char yield of the copyrolysis, the liquid and total gas exhibited synergy for all three BRs. The pre-exponential factors and the activation energies of BRs of 0.25, 0.5, and 0.75 were obtained using a kinetic study of co-pyrolysis.

Thermal properties of group components of the pitch–PET compositions

“…Pyrolysis and the accompanying evolution of volatile fractions can be associated with destruction of DSC/mW mg -1 hydrocarbons, partial abstraction of functional groups, formation of simple compounds CO 2 and CH 4 , condensation and polymerization of resulting particles [16][17][18]. In the process of thermal decomposition of pitch-polymer compositions, reactions may occur between decompositions products of CTP and PET.…”

Co-pyrolysis characteristics and kinetics of low metamorphic coal and pine sawdust

“…The stage II was at 230-400 C, and the corresponding DTG curve shows a weight loss peak at 341 C. In this stage, the pyrolysis reaction of hemicellulose and cellulose occurred. 35 Stage III was at 400-700 C, where the more thermally stable lignin underwent pyrolysis reactions and the TG curve was relatively at.…”

Co-pyrolysis of Miscanthus Sacchariflorus and coals: A systematic study on the synergies in thermal decomposition, kinetics and vapour phase products

“…Lignite had a weaker internal cohesive structure that bituminous coal and hence had a better interaction with biomass during the co-pyrolysis. Jeong et al [14] studied co-pyrolysis of wood and bituminous coal under five blend ratios by TG method with real-time gas analysis. The synergy on the reactivity of co-pyrolysis was observed only at specific temperatures.…”

“…Other factors such as use of catalyst [13,16,19], pre-treatment [18,20] and reactor configuration [16,19,21] can also affect the synergistic effect on the co-pyrolysis of biomass and coal. Some studies have been focused on the thermal behaviour and kinetic analysis of coal blended with different biomass, such as forestry residues [13,14,16,17], agricultural residue [15,19], microalgae [22,23], switchgrass [21], sugarcane residues [24], shell [12,20] etc.…”