Hydrogen yield of conventional biomass gasification is limited by chemical equilibrium constraints. A novel technique that has the potential to enhance the hydrogen yield by integrating the gasification and absorption reactions has been suggested. The method involves gasification of biomass in presence of a sorbent. Ethanol was used as the model biomass compound and CaO was the representative sorbent. Equilibrium modeling was used to determine the product gas composition and hydrogen yield. The analysis was done using ASPEN PLUS software (version 12.1) and the Gibbs energy minimization approach was followed. The effects of temperature, pressure, steam/ethanol ratio, and CaO/ethanol ratio on product yield were investigated. Three case studies were conducted to understand the effect of sorbent addition on the hydrogen yield. Thermodynamic studies showed that the use of sorbents has the potential to enhance the equilibrium hydrogen yield of conventional gasification by and reduce the equilibrium content of product gas by 50.2%. It was also found that the thermodynamic efficiency of sorbent-enhanced gasification (72.1%) was higher than conventional gasification (62.9%). Sorbent-enhanced gasification is a promising technology with a potential to improve the yield and lower the cost of hydrogen production.
A Novel Approach to Enhance the Hydrogen Yield of Biomass Gasification Using Sorbent
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Mahishi, M. R., Sadrameli, M. S., Vijayaraghavan, S., and Goswami, D. Y. (November 2, 2007). "A Novel Approach to Enhance the Hydrogen Yield of Biomass Gasification Using Sorbent." ASME. J. Eng. Gas Turbines Power. January 2008; 130(1): 011501. https://doi.org/10.1115/1.2747252
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