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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. 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. 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.
producer gas low-N 2
producer gas flue gas pyrolysis in
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
cooling filter OLGA
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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.
- Spring '08
- Chemical Engineering