Abstract
Sorption enhanced gasification (SEG) is a promising technology for producing gas derived from renewable feedstock to be used in biofuel synthesis processes. As a response to the growing need for renewable fuels, an SEG reactor design was developed for industrial-scale dimethyl ether (DME) production. A 100MWth scale SEG reactor concept for wood pellets as a feedstock was created by a model-based approach. Thus, a 1D modeling tool for the coupled circulating fluidized beds was developed. The model was used to investigate the dual fluidized bed system’s operation in the gasifier temperature range of 730–790°C. In this range, the optimal producer gas composition without external hydrogen for the downstream DME synthesis was achieved at gasifier temperature 730°C: 63 %vol,dbH2, 11 %vol,dbCO, 13 %vol,dbCO2. The model prediction was successfully compared against experimental data and modeling results from the literature. The developed 1D model enables the investigation of the composition and yield of the producer gas with different operating parameters, such as the part-load operation. This advanced capability can be used to develop new control strategies for the SEG system and investigate the impact of various operating parameters on the producer gas composition and yield.
Highlights
EU strategy for the transition to a low-carbon economy sets out a framework and mechanisms to address climate change
The optimal producer gas composition without external hydrogen for the downstream dimethyl ether (DME) synthesis was achieved at gasifier temperature 730C: 63 %vol;db H2, 11 %vol;db CO, 13 %vol;db CO2, corresponding Module value of 2.1
The modeling method used took into account the hydrodynamic solids profiles and flow rates between the reactors
Summary
The operating parameters affecting producer gas yield and composition are steam to carbon ratio, biomass feed rate to the combustor, solid inventories in the reactors, solids carrying capacity of CO2, and solids circulation rate between the reactors. By these parameters, the reactors’ temperature levels can be controlled, resulting in the target reaction environment. In this work, coupled SEG process is simulated on an industrialscale using CFB technology in both reactors considering the reactors’ hydrodynamics and using kinetic modeling for the reactions These novel model approach and reactor combination have not been considered in the earlier studies. SEG model in a scale of 100MWth is used to estimate SEG operation in the gasifier
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