Chlorine removal from incinerator bottom ash by superheated steam

Hiroki Suda, Md Azhar Uddin, Yoshiei Kato

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    In this study, the dechlorination of two kinds of incineration bottom ashes containing NaCl, CaCl2 and MgCl2 was investigated under various superheated steam temperatures between 408 and 693 K and a steam flow rate of 10 kg/h. The mechanism of chlorine removal from three kinds of simulated ash samples shaped into cuboid was discussed on the basis of chlorine removal rate data involving one kind of inorganic chloride. The chlorine removal amount from the incineration ashes increased with increasing superheated steam temperature, however the amount of chlorine removal depended on the composition of the incineration ashes. The amount of chlorine removal from the incineration ash containing NaCl and CaCl2 was smaller than that from the ash containing NaCl and MgCl2 at the same superheated steam temperature. The chlorine removal amount from the simulated ash samples with different chlorides was increased in the following order: CaCl2, NaCl and MgCl2. The dechlorination rate was analyzed by an unreacted core model newly applied for cuboid. It is suggested that the chlorine removal rates from the simulated samples containing SiO2, Al2O3 and one of the inorganic chlorides (NaCl, CaCl2 or MgCl2) were controlled by the diffusion of gas in the solid sample.

    Original languageEnglish
    Pages (from-to)753-760
    Number of pages8
    JournalFuel
    Volume184
    DOIs
    Publication statusPublished - Nov 15 2016

    Keywords

    • Chloride
    • Dechlorination
    • Incineration bottom ash
    • Superheated steam
    • Unreacted core model

    ASJC Scopus subject areas

    • General Chemical Engineering
    • Energy Engineering and Power Technology
    • Fuel Technology
    • Organic Chemistry

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