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Unformatted text preview: unit (figure 7b), and water scrubbing for removal of NH3 and halides. In order
to achieve the desired H2/CO ratio for methanation, additional hydrogen was added to
the gas. Then the gas was compressed (up to 60 bar) and led through ZnO filters for
sulphur removal and active carbon filters for final protection (figure 7c). The clean gas
was then used as feed for the micro-flow fixed-bed methanation reactor (figure 7d)
with a Ru-based catalyst, operated at 30 bar and 260°C.
Table 3 Product gas composition (beech) of oxygen/steam-blown test in the ECNWOB gasifier.
C2H6 ECN-RX--04-085 Composition
0.3 12 The suitability of the cleaned biomass product gas for SNG synthesis was proven
by stable catalyst performance during the 150-hours integrated methanation test. The
deactivation rate was comparable with a reference case, in which a “clean” synthetic
mixed gas was used as feed stream.
The ECN test facilities, as presented in figure 7, were also used during 2001-2003
to prove the technical feasibility of producing Fischer- Tropsch liquids from biomass by
integrated biomass gasification (oxygen-blown) Fischer- Tropsch experiments. (a) (b) (c) (d) Fig. 7 Lab-scale test facilities for “Green Gas” production: (a) Bubbling fluidised bed
test facility for oxygen/steam-blown gasification (WOB); (b) ECN oil-based tar
washer (OLGA); (c) Compressor and guard beds; (d) Fixed-bed micro flow
methanation reactor (POTTOR). ECN-RX--04-085 13 FUTURE PROSPECTS
The “Green Gas” technology developments at ECN will be continued in 2004-2005, in
co-operation with the Dutch Gasunie Trade & Supply (GU T&S) and Gastransport
Services (GtS). ECN has recently constructed a bench-scale gasification facility, in
order to support the implementation of the selected technologies for conversion of
relatively dry biomass streams. The new so-called MILENA gasifier, with thermal
inputs up to 25 kW (5 kg/hr biomass), can be operated at direct oxygen- blown
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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