EUBCE 2024 - Ingwald OBERNBERGER - Evaluation of Different Catalyst Recipes Regarding Tar Conversion of Pyrolysis Gas from Continuously Operated Slow Pyrolysis Reactors

Evaluation of Different Catalyst Recipes Regarding Tar Conversion of Pyrolysis Gas from Continuously Operated Slow Pyrolysis Reactors

Short Introductive summary

In a current project a new continuous pyrolysis process based on a counter-current flow reactor with optimised pyrolysis gas utilisation is developed. The novel pyrolysis reactor produces an almost dust free pyrolysis gas (filter effect of the fuel bed). The rather high tar content in the gas is removed in a downstream tar reforming process that shall enable the use of the cleaned pyrolysis gas in a gas engine for electricity and heat production. To remove the main share of the tars in the gas, a multi-step approach is applied: 1. the tars are thermally cracked in a conversion zone (tar reduction 85 to 90 wt.%), 2. the tars are further converted by partial oxidation (POX) of the gas (90 to 95% tar reduction after step 2). The almost dust free pyrolysis gas enables the final tar reforming step comprising a newly developed catalyst based on wire meshes. This paper will cover the selection and testing of different catalyst recipes under lab-scale conditions in order to select the most suitable one for the application tested. As a result of the work presented, catalyst recipes which are suitable for a highly efficient tar reformation of pyrolysis gas (tar removal 99%) are available.

K. Supancic, BIOS Bioenergiesysteme, Graz, AUSTRIA
T. Hargitai, Catator, Lund, SWEDEN
F. Silversand, Catator, Lund, SWEDEN
C. Schlögl, BIOS Bioenergiesysteme, Graz, AUSTRIA
T. Brunner, BIOS Bioenergiesysteme, Graz, AUSTRIA
I. Obernberger, BIOS Bioenergiesysteme, Graz, AUSTRIA