<![CDATA[Coffee husk waste is a promising biomass resource for renewable energy production through gasification; however, its utilization remains relatively limited. This study aimed to design a container-based downdraft gasification reactor with a processing capacity of 50 kg/h and evaluate its thermal performance through temperature distribution analysis using SolidWorks Simulation. The reactor dimensions were determined based on stoichiometric calculations with an equivalence ratio (ER) of 0.3, resulting in a reactor diameter of 760 mm, a height of 1900 mm, a throat diameter of 234 mm, and a nozzle diameter of 34 mm. Thermal simulations were conducted under steady-state conditions using Stainless Steel (SS) 310S as the reactor material. The applied thermal loads were 269.651°C in the drying and pyrolysis zone, 759.150°C in the oxidation (throat) zone, 250.843°C in the reduction zone, and 140.045°C at the grate, with a natural convection boundary condition of 5 W/(m²·K). The results showed that the highest temperature of 759.150°C occurred in the throat region, while the maximum outer surface temperature reached approximately 59.566°C. The estimated convective heat loss to the surrounding environment was 0.78 kW, equivalent to only 0.31% of the biomass energy input, indicating that the selected SS 310S material and wall thickness configuration provided effective thermal insulation. These findings provide a practical reference for the design and thermal optimization of safe and efficient container-based biomass gasification reactors]]>
