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Performance of fluidized bed steam gasification of biomass – Modeling and experiment

Loha, Chanchal, Chatterjee, Pradip K., Chattopadhyay, Himadri
Energy conversion and management 2011 v.52 no.3 pp. 1583-1588
biomass, carbon dioxide, coal, fluidized beds, gasification, hydrogen, methane, models, rice hulls, steam, temperature, China, India
This paper presents the investigation of the performance from different biomasses in a fluidized bed gasifier where steam has been used as gasifying as well as fluidizing agent. An experimental setup is fabricated to study the gasification performance of rice husk, which is of special relevance to rice-producing countries like China and India. An equilibrium modeling approach is deployed to predict the gas composition which has been compared with the experimental results. Calibration of the model with appropriate modeling coefficients was necessary to achieve close resemblance with the experimental values. Further, the model is used to predict the gas compositions from other biomass and benchmarked with the performance of coal. In this study, the gasification temperature is varied from 650°C to 800°C, whereas the steam-to-biomass ratio (S/B) is varied from 0.75 to 2.00. As the gasification temperature increases, the production of H₂ and CO increases but the generation of CH₄ and CO₂ reduces. The steam-to-biomass ratio was again found to influence the production rates. With increasing steam input, H₂, CO₂ and CH₄ were found to increase while CO reduces.