The Effect of CO₂ Gasifying Agent Velocity Variation on the Temperature Profile of a Dual Fluidized Bed Reactor in Coal Co-Gasification

Abstract

This study examines the effect of varying CO₂ flow rates on the temperature distribution within a Dual Reactor Fluidized Bed (DRFB) system fueled by a blend of coal and Refuse Derived Fuel (RDF). Temperature plays a vital role in gasification processes, as it directly influences the occurrence and continuity of thermochemical reactions between the fuel and the gasifying agent. The flow rate variations tested in this research include 0, 3, 8, and 13 L/min. The system was operated until the gas formation process ceased, and temperature data was recorded throughout the operation. The results indicate an initial temperature drop caused by system cooling, followed by a gradual increase once the fuel ignited. Among the tested variations, the 8 L/min CO₂ flow rate demonstrated the most stable temperature distribution over time. This variation produced a more consistent thermal profile compared to the others, which showed larger fluctuations. In contrast, excessively low or high CO₂ flow rates caused thermal imbalances that could potentially disrupt the gasification process. These findings suggest that proper regulation of CO₂ flow rate plays a crucial role in maintaining reactor temperature stability. Selecting an optimal flow rate is key to ensuring a controlled and steady gasification process within the DRFB system.