Biomass Gasification System Integrated With Dual Fluidized Bed Reactor Technology

Biomass is one of the promising renewable resources to substitute fossil fuel. Among the biomass conversion methods, gasification is regarded as a major technology that is being extensively utilizeddue to its capability of handling wide range of biomass feedstock. In this work, we applied a special gasification technology called dual fluidized bed (DFB) reactor to an integrated system which is designed to produce liquid fuel and electricity.The system consists of four main sections, i.e. Gasification, CO2 capture, F-T synthesis, Power Generation. HRSG unit is applied to recycle the sensible heat and produce steam, and the heat and electricity demanded by this system is produced by itself.The simulation is conducted in Aspen Plus and the results are verified with the literature and industrial data. Carbon chain analysis, energy analysis and green degree method are applied to evaluate the mass conversion, energy utilization and environmental influence of the system.Evaluation results based on the calculated data present a detailed description of the system.16.6% of the total carbon is transferred into liquid oil, and CCS process captures 32.0% carbon in the form of CO2,CO conversion of DFB reactor has a significant on oil production.Considering energy utilization and distribution, energyefficiencyof biomass utilization is 72.1%,24.0%in liquid fuel and 15.7%in electricity, the rest are stored in district heat as byproduct. According to the comparison between several integrated systems based on DFB technology, this unique design shows a better way to utilize biomass resources.Green Degree analysis shows that rational use of biomass resources has a positive impact on the environment. This work provides a prospect of integration system based on DFB gasification.