On a carbon-negative energy production scheme via a quadruple fluidized bed gasifier. (1st September 2018)

• Record Type: Journal Article
• Authors: Yan, Linbo; Cao, Yang; Li, Xuezheng; He, Boshu
• Is Part Of: Energy conversion and management. Volume 171(2018)
• Page Start: 326
• Page End: 338
• Publication Date: 2018-09-01
• Subjects: Co-gasification -- Quadruple fluidized bed -- Chemicallooping -- Carbon capture -- Modeling; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2018.05.074
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: A novel QFB gasifier for the carbon-negative energy production is proposed. The synergistic effect on the co-gasification kinetics is allowed for. The fluidization hydrodynamics is coupled with the chemical reaction kinetics. The H2 mole fraction in syngas from the QFB is over 70%. The CO2 mole fraction in flue gas from the QFB is over 97%. Abstract: To restrain the CO2 concentration in atmosphere, deployment of the carbon-negative energy generation devices is indispensable on account of the vast net carbon discharge every year. In this work, a novel and promising quadruple fluidized bed (QFB) reactor for the biomass/coal co-gasification is proposed to generate the high-quality syngas whilst separate CO2 for further sequestration or utilization. To reveal the fundamental rules governing the reactor, a one dimensional model coupling the gas-solid flow hydrodynamics and the chemical reaction kinetics is built to simulate the physicochemical processes in the QFB, and the effects of several pivotal operation parameters on the reactor performance are comprehensively analyzed. It is found that the QFB runs stably under the given condition. The H2 mole fraction in the dry syngas is higher than 70%, the CO2 mole fraction in the dry flue gas is around 97%, and the net carbon discharge can be negative when the biomass blending ratio is over 0.5. The methodology and findings in this work are of reference value for the lab, pilot or industrial scale QFB designation and operation, and can be extended to develop similar novel reactors for the carbon-negative energy generation.