An experimental study on co-gasification of coal · biomass blended chars with CO₂

In a lab scale tube furnace, mixtures of coal and biomass were co-pyrolyzed under nitrogen atmosphere condition to become chars. Then these chars were co-gasified with CO₂ under isothermal conditions. CO concentration was measured by a real time gas analyser with NDIR (Non-dispersive infrared) CO and CO₂ sensor. The furnace temperature was varied between 900-1100°C. The Volume Reaction Model (VRM), Shrinking Core Model (SCM) and Random Pore Model (RPM) were used to interpret the experiment data. The activation energy (E_a) and frequency factor (A) of coal and biomass char-CO₂ reaction were determined using the Arrhenius equation. As a result, the reactivity on co-gasification of blended chars was improved than single coal char because of catalysis of alkaline minerals which were included in biomass char.