Community Research and Development Information Service - CORDIS


Degradation of Tar-water from Biomass Gasification - DETAR, Final Report, Part 1

Project ID: ENK5-CT-2002-00675
Funded under: FP5-EESD


Biomass gasification product gas is often wet scrubbed or cooled to remove tar and particles before use in gas engines and even for dry gas cleaning it is necessary to perform a final cooling process. Because of the considerable amounts of water vapour in the product gas, contaminated water will be produced (even the best schedules do not completely remove all traces of tars and particles) and these effluents will result in environmental problems if not cleaned before discharged to the urban sewerage network.
The overall objective of the present project is to evaluate the full-scale application of supercritical wet oxidation and gasification (SCWO/G). The process under study refers to the aqueous oxidation/reduction of organic contaminants at pressures and temperatures above critical data for water. The use of the developed technology can improve the electric efficiency of biomass gasification based Combined Heat and Power (CHP) and therefore reduce energy production related CO2 emission. When biomass utilisation is increased in this way it will be possible to create local employment for the handling of the biomass fuel and also for the actual operation of the plant.
In the project, waste water, from an updraft gasification based CHP plant, is used. The experiments are carried out at both laboratory scale (2 kg/h unit) and pilot scale (50 - 60 kg/h Process Development Unit - PDU).
From January 2003 to December 2005 more than 300 samples were analysed by IWC. Feedstock, liquid products and gaseous products were characterised and quantified. Different methods have been available for the analysis of tar-water. The methods are approved for Bio Crude Oil (BCO) at IWC. The aqueous matrix of the tar-water was a challenge, and therefore the analysis methods needed further developments and adaptations. This was solved in the early stages of the work performed by IWC.

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