(231e) Low-Order Modeling of the Vapor Phase Upgrading of Fast Pyrolysis Bio-Oil in a Bubbling Fluidized Bed Reactor
We have developed a model of the catalytic vapor phase upgrader at NREL. This model employs a network of ideal stirred tank reactors to represent the different zones (bubbling bed, freeboard above the bed, solids inlet/outlet in the middle of the freeboard, and freeboard above the solids inlet) in the real reactor. Aside from a few adjustable parameters (the fraction of solids in the freeboard regions and the solids inlet/outlet region), all necessary parameters are specified with correlations drawn from the fluidized bed literature. We also incorporate an existing kinetic scheme for upgrading bio-oil on ZSM 5.[3, 4]
We employ uncertainty quantification to estimate the reliability of our predictions and global sensitivity analysis to determine the parameters with the most influence on reactor operation. Based on these results, we offer suggestions to improve reactor performance and highlight areas requiring more fundamental research such as the need for improved kinetic schemes and better fluidization correlations.
1. Iisa, K., et al., Energy & Fuels 30, 2144 (2016).
2. Yung, M.M., et al., Energy & Fuels 30, 9471 (2016).
3. Adjaye, J.D. and N.N. Bakhshi, Fuel Processing Technology 45, 161 (1995).
4. Adjaye, J.D. and N.N. Bakhshi, Fuel Processing Technology 45, 185 (1995).