The effect of different operational parameters on hydrogen rich syngas production from biomass gasification in a dual fluidized bed gasifier

Biomass energy will be a crucial constitution of renewable energy in the future and hydrogen production from biomass on a large scale may contribute to a renewable development of energy. However, due to high-energy consumption in all technologies of hydrogen production from biomass, progress is impeded and this technology remaining restricted to a laboratory scale. In this research, Hydrogen production via biomass gasification in a dual bubbling fluidized bed gasifier is investigated. In order to model the gasification process inside the reactor, a one dimensional model is generated. The generated model consists of a highly nonlinear set of eleven differential equations in which the effect of various parameters such as flow hydrodynamics, diffusion, convection and chemical reactions are considered on interaction and transfer of different species in the reactor and final produced syngas composition. The obtained results are validated by use of existed experimental data in the literature which show an acceptable compatibility. Finally, the reactor operation is investigated in various working conditions and the effect of parameters such as temperature, gasification agent inlet flow rate, humidity, particle size and reactor size on Hydrogen production is studied in order to clarify the optimum operating condition of reactor with regards to Hydrogen production.