Cleaning of hot producer gas in a catalytic adiabatic packed bed reactor

L. van de Beld, B.M. Wagenaar, W. Prins

    Research output: Chapter in Book/Report/Conference proceedingChapterAcademic


    To use the product gas of a biomass gasification unit in, for instance, gas engines, its tar content must be reduced to less then 100 mg/Nm3 [1]. A novel technology has been tested which is characterised by periodic reversal of the gas flow through a packed-bed tar removal reactor. Because the entrance and outlet sections of the reactor act as efficient heat exchangers, the producer gas leaves the reactor at relatively low temperatures. A small fraction of the producer gas is burned in situ to supply the energy required for the tar conversion reactions. This way of operation provides a high degree of heat integration.

    The main parts of the pilot plant installation are a 100 kWth wood gasifier and a packed bed tar converter, with a diameter of 0.22 m and is filled with approximately 50 kg of dolomite catalyst. Depending on the operating conditions the direction of the flow is reversed every 10 to 60 min. Tar conversions above 98% were achieved, without any notable on the caloric value of the treated gas. Optimization of the system should focus on improvement of the switching valves and application of a more active catalyst.
    Original languageEnglish
    Title of host publicationDevelopments in Thermochemical Biomass Conversion
    EditorsA.V. Bridgwater, D.G.B. Boocock
    Place of PublicationDordrecht
    PublisherBlackie Academic & Professional
    Number of pages14
    ISBN (Electronic)978-94-009-1559-6
    ISBN (Print)978-94-010-7196-3
    Publication statusPublished - 1996


    • Tar removal
    • Gasification
    • Reverse flow operation
    • Catalytic gas cleaning


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