Enhanced hydrogen production process from coal integrated with CO 2 separation using dual chemical looping

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    11 Citations (Scopus)

    Abstract

    An advanced hydrogen production system with CO 2 separation is introduced in this paper, which is based on HyPr-RING and enhanced by dual chemical looping. The first chemical looping is for CO 2 separation using lithium ortho-silicate (Li 4SiO 4) as a solid CO 2 sorbent which can absorb CO 2 around 650 °C with an exothermic reaction and regenerate around 800 °C. Another chemical looping by red-ox reaction of a metal oxide is applied to oxygen carrier in the gasification reactor and heat source to regenerate the sorbent. Copper oxide (CuO) is one of the suitable materials for oxygen carrier because reduction of CuO by carbon is exothermic reaction which benefits energy balance, while reduction of nickel oxide or hematite by carbon is endothermic reaction. Dry mixtures of copper oxide and graphite in various ratio and sieve mesh size were dropped into the reactor preheated at various temperatures and each component of product gas was quantified by gas meter and GC/TCD. Hydrogen production from graphite was confirmed even at around temperature of CO 2 absorption, but in any test conditions, a simple mixture of CuO and graphite mainly produced CO 2 by complete oxidation.

    Original languageEnglish
    Title of host publicationEnergy Procedia
    Pages324-332
    Number of pages9
    Volume4
    DOIs
    Publication statusPublished - 2011
    Event10th International Conference on Greenhouse Gas Control Technologies - Amsterdam, Netherlands
    Duration: 2010 Sep 192010 Sep 23

    Other

    Other10th International Conference on Greenhouse Gas Control Technologies
    CountryNetherlands
    CityAmsterdam
    Period10/9/1910/9/23

    Fingerprint

    Hydrogen production
    Graphite
    Exothermic reactions
    Copper oxides
    Coal
    Sorbents
    Gas meters
    Nickel oxide
    Carbon
    Oxygen
    Sieves
    Hematite
    Energy balance
    Gasification
    Silicates
    Lithium
    Oxidation
    Temperature
    Oxides
    Metals

    Keywords

    • Chemical looping
    • Oxygen carrier
    • Solid sorbent

    ASJC Scopus subject areas

    • Energy(all)

    Cite this

    Enhanced hydrogen production process from coal integrated with CO 2 separation using dual chemical looping . / Nakagaki, Takao.

    Energy Procedia. Vol. 4 2011. p. 324-332.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Nakagaki, T 2011, Enhanced hydrogen production process from coal integrated with CO 2 separation using dual chemical looping in Energy Procedia. vol. 4, pp. 324-332, 10th International Conference on Greenhouse Gas Control Technologies, Amsterdam, Netherlands, 10/9/19. https://doi.org/10.1016/j.egypro.2011.01.058
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    AB - An advanced hydrogen production system with CO 2 separation is introduced in this paper, which is based on HyPr-RING and enhanced by dual chemical looping. The first chemical looping is for CO 2 separation using lithium ortho-silicate (Li 4SiO 4) as a solid CO 2 sorbent which can absorb CO 2 around 650 °C with an exothermic reaction and regenerate around 800 °C. Another chemical looping by red-ox reaction of a metal oxide is applied to oxygen carrier in the gasification reactor and heat source to regenerate the sorbent. Copper oxide (CuO) is one of the suitable materials for oxygen carrier because reduction of CuO by carbon is exothermic reaction which benefits energy balance, while reduction of nickel oxide or hematite by carbon is endothermic reaction. Dry mixtures of copper oxide and graphite in various ratio and sieve mesh size were dropped into the reactor preheated at various temperatures and each component of product gas was quantified by gas meter and GC/TCD. Hydrogen production from graphite was confirmed even at around temperature of CO 2 absorption, but in any test conditions, a simple mixture of CuO and graphite mainly produced CO 2 by complete oxidation.

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