The goal of this paper is to introduce you in gas treatment for (biomass) gasification and especially the new OLGA technology. OLGA is a tar removal system developed to clean product gas from biomass gasifiers but can also be applied for other purposes. Although gasification is a very old technology, the utilisation of gasifiers to make a combustible product gas for producing renewable energy in a gas engine or gas turbine is relatively new. This report therefore contains an introduction in (biomass) gasification and specifically the necessary gas purification. As biomass is the only renewable carbon source and the gas market is expected to increase faster than any other energy source, a very promising future is expected. Tar related problems are the most important obstruction for the introduction of biomass gasification as source of electricity and SNG on a large scale. Tars are responsible for major operational problems due to tar condensation (fouling) and poisonous condensate leading to unacceptable waste water costs. The tar problem is defined introducing critical parameters as the tar dew point, removal of hetero-cyclic tars (like phenol) and the removal of naphthalene. You are introduced in the OLGA tar removal process. Performance of OLGA is demonstrated by showing the results of the duration test with a 0.5 MW(t) industrial pilot plant at ECN in the Netherlands. The OLGA process showed to be stable and reliable and was operated for more than 650 hours. The gas quality was on specification, the gas engine ran smoothly. Results on tar dew point (<10 °C), phenol removal (completely) and naphthalene removal (>99%) were excellent. Finally an outlook is presented to OLGA’s near future. An important tender in France comprising 6 commercial gasification plants with a total electrical output of 81 MW(e). The commercial installations are preceded by a 1 MW(e) industrial pilot plant. In this plant the selected gasifier, gas cleaning and gas engine are tested together after which technical and economical optimisation is studied for the benefit of the bigger commercial plants that follow. First results are discussed in this paper.
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