Typical product gas composition main components in

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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. Component CO H2 CO2 CH4 C2H2 C2H4 C2H6 Composition vol.% 42-46 15-20 10-12 14-17 0.2-0.6 4.4-4.8 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 2008. 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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