Fluidized bed gasification of select granular biomaterials

Area of Science:

• Biomass energy conversion
• Thermochemical processes
• Fluidized bed technology

Background:

• Biomaterials offer a renewable energy source but pose challenges for thermochemical conversion due to their physical properties.
• Fluidized bed gasification is an effective method for converting granular biomass into gaseous fuels.

Purpose of the Study:

• To investigate the fluidized bed gasification of coir pith, rice husk, and sawdust.
• To analyze the composition of the synthetic gas produced.
• To determine the effect of operating parameters on gas yield and composition.

Main Methods:

• Selected coir pith, rice husk, and sawdust as feedstocks.
• Utilized a fluidized bed gasifier to generate synthetic gas.
• Analyzed product gas composition (CO, CO2).
• Varied equivalence ratio (0.3-0.5) and reaction time.
• Developed models to correlate biomaterial properties and operating conditions with gas output.

Main Results:

• Synthetic gas was successfully generated from all tested biomaterials.
• Carbon monoxide (CO) and carbon dioxide (CO2) percentages ranged from 8.24-19.55% and 10.21-17.14%, respectively.
• Gas yields varied: coir pith (1.98-3.24 Nm3 kg-1), rice husk (1.79-2.81 Nm3 kg-1), and sawdust (2.18-3.70 Nm3 kg-1).
• Equivalence ratio and reaction time significantly influenced gas constituents.

Conclusions:

• Fluidized bed gasification is a viable method for converting agricultural and forestry wastes into synthetic gas.
• Biomaterial properties and operating conditions are critical factors for optimizing gas production and composition.
• Developed models provide insights into predicting energy output and gas constituents.