Concerning the supercritical water gasification of

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Unformatted text preview: sting for the short-term introduction of “Green Gas” in the Dutch energy supply, the supercritical water gasification processes seem to be more promising for conversion of wet biomass to “Green Gas” on the longer term. Concerning the supercritical water gasification of biomass, the process is in an early stage of development. Recently, different Dutch organisations (Biomass Technology Group, SPARQLE, University of Twente, TNO, and ECN) started ECN-RX--04-085 14 working on possible national co-operation, regarding technology development for the SCWG process[10]. One of the important aspects for future investigation is the introduction of feedstock in the SCWG process. Regarding the heat balance, an intensive heat exchange between feedstock and products is essential. This heat exchange is a non-trivial matter, as the feedstock will already produce decomposition products like tar and char or coke, while being heated. Non-conventional solutions for the pump, heat exchanger and reactor, as well as for residual carbon combustion, may be required to obtain a practical process. When the biomass concentration in water increases, the product will gradually contain more hydrocarbons and full conversion becomes difficult. Catalysts are then required to improve the conversion. Despite all the problems in the early stage of development, the wet-biomass conversion processes could become an attractive option for the production of clean “Green Gas” from biomass and organic waste[9]. As mentioned earlier, based on an expected market and technology development, the first commercial products of supercritical gasification of biomass would be electricity (>2008), followed by “Green Gas” after 2010[10]. low-N2 producer gas low-N 2 producer gas flue gas pyrolysis in riser BFB gasifier fuel BFB combustor fuel oxygen/steam combustion air support gas (steam, CO 2, …) MILENA as BFB gasifier MILENA as indirect gasifier Fig. 8 Two options of MILENA installation for the production of low-N2 product gas from biomass. existing new Flue gas MILENA as indirect gasifier Product gas cooling filter OLGA (ta...
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This essay was uploaded on 03/18/2014 for the course ENG 316K taught by Professor Kruppa during the Spring '08 term at University of Texas at Austin.

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