The goal of this paper is to introduce you in gas treatment for (biomass) gasification andespecially the new OLGA technology. OLGA is a tar removal system developed to cleanproduct 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 acombustible product gas for producing renewable energy in a gas engine or gas turbine isrelatively new. This report therefore contains an introduction in (biomass) gasification andspecifically the necessary gas purification. As biomass is the only renewable carbon sourceand the gas market is expected to increase faster than any other energy source, a verypromising future is expected.Tar related problems are the most important obstruction for the introduction of biomassgasification as source of electricity and SNG on a large scale. Tars are responsible for majoroperational problems due to tar condensation (fouling) and poisonous condensate leading tounacceptable waste water costs. The tar problem is defined introducing critical parameters asthe 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 a0.5 MW(t) industrial pilot plant at ECN in the Netherlands. The OLGA process showed to bestable and reliable and was operated for more than 650 hours. The gas quality was onspecification, 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 Francecomprising 6 commercial gasification plants with a total electrical output of 81 MW(e). Thecommercial installations are preceded by a 1 MW(e) industrial pilot plant. In this plant theselected gasifier, gas cleaning and gas engine are tested together after which technical andeconomical optimisation is studied for the benefit of the bigger commercial plants thatfollow. First results are discussed in this paper.
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