Gasification of Low-Grade Coal in a Dual Fluidized-Bed Steam Gasifier

Authors

  • Stefan Kern,

    Corresponding author
    1. Vienna University of Technology, Institute of Chemical Engineering, Getreidemarkt 9/166, 1060 Vienna (Austria), Fax: (+43) 1 58801 16699
    • Vienna University of Technology, Institute of Chemical Engineering, Getreidemarkt 9/166, 1060 Vienna (Austria), Fax: (+43) 1 58801 16699
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  • Dr. Christoph Pfeifer,

    1. Vienna University of Technology, Institute of Chemical Engineering, Getreidemarkt 9/166, 1060 Vienna (Austria), Fax: (+43) 1 58801 16699
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  • Prof. Dr. Hermann Hofbauer

    1. Vienna University of Technology, Institute of Chemical Engineering, Getreidemarkt 9/166, 1060 Vienna (Austria), Fax: (+43) 1 58801 16699
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Abstract

The gasification of a bituminous coal was performed in a dual fluidized-bed (DFB) steam gasifier at a fuel power of 90 kWth. The main aim of these tests was to prove the suitability of the DFB system for cheap low-grade coals that are often delivered with a wide range of particle sizes and ash loads. The fine fraction in particular can become entrained in the gas stream and thus be responsible for changes in the system performance and gas quality. The selected gasifier bed material was olivine, with an applied particle size of 375 μm, the steam-to-carbon ratio was 1.3 kgmath image kgC−1, and the gasification temperature was 850 °C. In addition to standard online analysis of the main components of the product gas, impurities that included NH3, H2S, and tar were also examined.

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