Characterization of a dual fluidized bed gasifier with blended biomass/coal as feedstock. (April 2018)

• Record Type: Journal Article
• Authors: Yan, Linbo; Cao, Yang; Li, Xuezheng; He, Boshu
• Is Part Of: Bioresource technology. Volume 254(2018)
• Page Start: 97
• Page End: 106
• Publication Date: 2018-04
• Subjects: Co-gasification -- Alkali metals -- Synergistic effect -- Dual fluidized bed gasifier -- Aspen Plus; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.01.067
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: A one dimensional model for biomass/coal co-gasification in a DFB is built. Synergy of co-gasification is considered according to reported experiments. The hydrodynamics is calculated based on the two-phase theory of fluidization. The superficial velocity, bubble size and pressure drop in the BFB is predicted. Effects of key operation parameters on the gasification results are investigated. Abstract: A one-dimensional model is built based on the commercial Aspen Plus software to kinetically simulate the biomass/coal co-gasification process in a dual fluidized bed gasifier. The synergistic effect on the co-gasification kinetics is allowed for, and is coupled with the gas–solid flow hydrodynamics. With the developed model, the effects of different key operating parameters including the biomass blending ratio ( R b ), the initial bed temperature ( T g ), the feedstock mass flow rate ( F fs ), the bed material flux ( F bm ) and the steam to carbon ratio ( R sc ) on the resultant syngas composition and the supplemental fuel mass flow rate ( F sf ) are investigated, and the operation parameters are optimized. It is found that increasing R b and T g can enhance the gasification, while increasing F fs and R sc restricts the gasification. Increasing F bm has slight effect on the gasification results but can reduce F sf . The cold gas efficiency is up to 78.9% under the proposed optimum condition.