Bench-scale and modelling study of the effect of H2O on sulphur capture by limestone in conditions of fluidized-bed air combustion and oxycombustion

Sirpa Rahiala, Jouni Ritvanen, Timo Hyppänen, Toni Pikkarainen

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    Limestone is used widely in fluidized bed energy applications for sulphur capture. The conditions of the novel fluidized bed energy processes can differ from the conditions (i.e., temperature and gas concentrations) in conventional fluidized bed applications for energy production. The influence of H2O(g) on calcination and indirect sulphation was examined with one limestone type in a bench-scale reactor. A time-dependent multilayer particle model was used for analysing the experimental results. The studied atmosphere included 0%, 10% or 20% H2O(g) and two different CO2concentration levels (15% and 50%). The temperature level was the same in all tests (~1188 K). The added H2O(g) increased the conversion degree compared to conditions without H2O(g) in all test conditions. The model was used to explicate the observed differences between test results with and without H2O(g) and determine the conversion curve, conversion profile and magnitude of reactions and diffusion as a function of radius and time. The results show that different sulphation patterns and conversion degrees can be explained with different limitations inside the particles in terms of time and in different conditions.
    Original languageEnglish
    Pages (from-to)233-240
    JournalFuel
    Volume196
    DOIs
    Publication statusPublished - 2017
    MoE publication typeA1 Journal article-refereed

    Keywords

    • fluidized bed
    • limestone
    • modelling
    • oxycombustion
    • sulphur capture
    • water vapour

    Fingerprint

    Dive into the research topics of 'Bench-scale and modelling study of the effect of H2O on sulphur capture by limestone in conditions of fluidized-bed air combustion and oxycombustion'. Together they form a unique fingerprint.

    Cite this