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Policy Department Renewable Technologies

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Policy Department Renewable Technologies ( policy-department-renewable-technologies )

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Assessment of Potential and Promotion of New Generation of Renewable Technologies ____________________________________________________________________________________________ For BTL the potential amounts to about 750 PJ per year (about 6% of today`s demand of road transportation fuel in the EU). In [CONCAWE 2007] the efficiency of the BTL plant was assumed to be about 38%, based on a hydrocarbon chain growth probability of 0.85 instead of 0.90. On the other hand according to [CONCAWE 2007] more excess electricity is generated from the BTL plant (lower BTL yield leads to higher electricity yield and vice versa). Assuming the BTL efficiency was 42% instead of 38% the potential would be about 830 PJ of BTL per year (about 7% of today’s demand of transportation fuel in the EU). The naphtha fraction generated by the Fischer-Tropsch Synthesis can also be used in the chemical industry for the production of polymers, needed to produce plastics (naphtha is cracked in another process to produce ethylene and propylene which are the monomers to produce polyethylene and polypropylene). If biomass derived plastics are recycled (or used as feedstock for gasification), the demand for biomass, and thus the requirements for land, can be significantly decreased (for this purpose). At the same time, the carbon will be kept longer in the use phase and added to the stock of durable goods in the technosphere. The production of materials however, is another use of biomass which competes with the use of lignocellulosic biomass for the production of BTL as transportation fuel. 1.4.3. Electricity generation via IGCC Lignocellulosic biomass can be used for the generation of electricity via an integrated gasification combined cycle (IGCC) process. The IGCC offers higher electrical efficiency than conventional steam turbine processes. Solid biomass fuelled IGCCs are still an issue of research and development. Instead of converting the product gas stream leaving a gasification plant to BTL, the product gas (mainly CO and H2) can be used for heat and electricity generation. In contrast to BTL plants air instead of pure oxygen can be used as gasification agent and thus avoid the requirement of an air separation plant. In case of allothermal gasification however, (steam is used as gasification agent) air separation is not required at all. Costs and lifespan The capital cost of a biomass fuelled integrated gasification combined cycle power plant (IGCC) with a capacity of 30 to 100 MWe is estimated at 3,500 to 5,000 €/kWe for an electrical efficiency of 40 to 50 % [SET 2009]. Until now biomass fuelled IGCCs are not commercially available. Biomass fuelled IGCCs are still in the stage of research and development. Energy efficiency and environmental performance Integrated gasification combined cycle power plants generally archieve a higher electrical efficiency than conventional steam turbine based biomass fuelled power stations. Circulating fluidised bed gasifiers are adequate from a few MWth (biomass input) up to 100 MWth. Biomass fuelled IGCC ensures high electrical conversion efficiency of 40 to 50% for 30 to 100 MWe plant [SET 2009]. According to [Paisley 2001] a biomass fuelled IGCC plant with a capacity of 25 MWe based on the allothermal gasifier developed by the Battelle- Columbus Laboratory (BCL) can archive a net electrical efficiency of 42.5%. The net electrical efficiency of the pilot biomass IGCC plant at Värnamo in Sweden is indicated with 32% (electricity plus heat: 83%) [Stahl 2004]. IGCC offers the advantage that the dust has to be removed from the product gas stream before inserting it into the gas turbine leading to potentially low dust emissions into the air. IP/A/ITRE/ST/2009-11 & 12 21 PE 440.278

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