Unformatted text preview: de, as well as at indirect steam- blown gasification mode, as presented in
figure 8. In the meantime indirect steam- blown tests have been carried out at T: 750°C830°C in gasification riser. Typical product gas composition (main components in
vol.% dry basis) for beech wood as feedstock is presented in table 4.
Table 4 Typical product gas composition (beech) of indirect steam-blown tests (at T:
750°C-830°C) in the ECN-MILENA gasification facility.
0.3-0.9 The MILENA facility is installed upstream of the already existing gas clean-up
infrastructure, followed by a newly to be constructed shift reactor and methanation
section, as presented in figure 9. The integrated system enables the proof of production
of a gas that can satisfy, among others, the specifications for downstream methanation.
The R&D activities are aimed at optimisation of the gasification conditions
(agglomeration behaviour, gas composition), gas cleaning (removal of tar and other
components) and conditioning, and an extensive methanation test programme. Also an
extensive modelling work is foreseen within the programme. The experimental data
will be used to fit the models, and the models will be used to predict new tests, as well
as to determine the mass and energy balance of the whole process. Another activity
concerns analysis and continuous monitoring of the Dutch natural gas market, and
potential role that might be played in it by “Green Gas”. The R&D activities should
result in a conceptual design for a pilot-scale integrated biomass gasification SNG
plant, to be realised and operated in 2005-2008. Commercial units are expected after
Anaerobic digestion is a proven technology being applied for small-scale
decentralised conversion of “wet” organic residues at their origin. SNG production in
this sector should always compete with the well-known combined heat and power
application. Although upgrading of biogas, produced via anaerobic digestion of wet
biomass, will be intere...
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- Spring '08
- Chemical Engineering, green gas, biomass gasification, ECN Biomass, SNG production