CaCO3 and air/steam effect on the gasification and biohydrogen performance of corn cob as received: Application in the Colombian Caribbean region

Rafael D. Gómez-Vásquez, Erika Arenas Castiblanco, Zulamita Zapata Benabithe, Antonio José Bula Silvera, Diego A. Camargo-Trillos

    Research output: Contribution to journalArticlepeer-review

    4 Scopus citations

    Abstract

    Corncob is one of the most abundant agro-industrial wastes globally. It represents a bioenergy feedstock of 1500–5500 million tons per year. The shape and size of the corncob are suitable for gasification without pretreatment (size reduction, densification, or drying) in a downdraft gasifier. However, its volatile content (about 80% DAF) can generate high tar content, representing a challenge to adopt this technology. In the present work, an evaluation of the effect of air-steam mixture and calcium carbonate CaCO3 as a promoter of both reforming and gasification reaction was carried out using corn cob without grains as raw material in a 40 kW gasifier. An analysis of variance of four experimental treatments was used to determine the main statistical and interactive effects on the syngas composition, hydrogen yield (yH2), syngas lower heating value (LHVgas), and cold gas efficiency (CGE). Results reveal the highest gasification performance achieved hydrogen production yields of 310 Nml/g, an LHVgas value of 4.8 MJ/Nm3, and cold gas efficiency of 59.18% with steam and CaCO3. Statistical analysis indicated that CaCO3 and steam influence H2 production by increasing 15.8% and 10.8%, respectively, with a CaCO3/biomass ratio of 1% (w/w) and a Steam/biomass ratio of 11% (w/w). Main statistical effects were found for CGE increase of 5% with the addition of steam, 10% with CaCO3, and synergy of 10% using CaCO3 and steam simultaneously.

    Original languageEnglish
    Article number106207
    JournalBiomass and Bioenergy
    Volume153
    DOIs
    StatePublished - Oct 2021

    Bibliographical note

    Funding Information:
    This research was supported by CIDI UPB- foundings of project 205M-07/17-G004. Diego Camargo is grateful to Minciencias Colombia through a PosDoctoral Scholarship program cont. 80740-483-2019.

    Publisher Copyright:
    © 2021

    Keywords

    • Carbonation
    • Cold gas efficiency
    • Gasification
    • Hydrogen
    • Steam reforming

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