Technology

Our plant consists of three main vessels or bed reactors: the pyrolyser at the bottom, the steam reformer in the middle and the pre-heater at the top. The input material is subjected to high temperatures in a vessel devoid of oxygen.  The feedstock is then separated into approximately 20% char and 80% synthesis gas.  The synthesis gas then moves up into the steam reformer where it is cracked and reformed into a high quality product gas. The steam reformer is a simple homogenous, purely gas phased reaction.  It is spatially separated from the pyrolyser, therefore staged reforming. A portion of the syngas is combusted in order to produce the necessary process heat.

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Unlike common biomass gasification processes, the product gas is very high quality. This is because it is unaffected from the flue gas generated during the syngas combustion for process heat.  Common biogas plants achieve a product gas with approximately 30-50 % calorific value, where as our product gas achieves around 80% efficiency.

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A key feature of our facility is the use of a circulating bulk material that acts as a heat-carrying medium. This ensures that the heat carrying surfaces are always clean and that the input material maintains the required process heat.  This makes it possible to use many input materials that cause slagging, fouling and corrosion in other systems. The pyrolyser and the reformer occur in separate gravity driven moving bed reactors. No further equipment is mounted inside.  The heat-carrying medium is moved by mechanical drive and gravity.

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Finally, the high quality product gas is combusted in the most efficient and clean generators available to produce electricity from a waste stream. If electricity is not the desired product, the gas can also be used to generate liquid fuels or be sold directly back into the pipeline.

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