Summary CHP biomass gasifier for the Zwarts Gerbera Nursery – Technical and economic feasibility Peeters, S. (Energy Matters) InnovationNetwork Report No. 11.2.274, Utrecht, The Netherlands, 2011. This report describes the feasibility of a CHP gasifier at the Zwarts gerbera nursery. Using the insights from this study, a picture has been sketched for energy production by means of gasification in the horticultural sector. Note, however, that each plant specie has its own specific growth requirements in terms of nutrients, heating-cooling, light, but also relative humidity and CO2. So a ‘typical’ horticulturer with an ‘average’ energy requirement is hard to define. The economic viability must be determined for each individual situation. The outcomes of this study can therefore not be automatically used for other projects. Technically, a lot is possible, so the submitted quotes show. Of the 16 suppliers, 3 offer CHP gasifiers which, subject to conditions, not only burn wood but also other low-grade residual waste such as road verge grass, reed and miscanthus. This low-grade residual waste has the advantage of being cheaper than wood. A low biomass price lowers the operating costs and improves the economic profitability of the relatively expensive installations. The investment for a complete CHP gasifier is 5 to 10 times higher than for a normal gas CHP installation. The CO2 consumption also influences the economic profitability. Buying CO2 is a costly business. The technical and economic feasibility of harvesting CO2 from flue gas was therefore explored. Two CO2 harvesting installations (of Procédé and Knook) were examined for this purpose. According to Procédé and Knook, CO2 harvesting is not economically profitable for a CHP gasifier with a relatively low power capacity (up to 800 kWe). CO2 procurement or generation by means of the existing gas-fired boiler therefore seems more viable. The technical-economic feasibility study shows that an investment in a CHP gasifier is not profitable due to the relatively high investment and maintenance costs. CO2 demand and the uncertain biomass prices are stumbling blocks. However, the picture changes when we factor in the renewable energy subsidy (SDE+) and investment subsidies such as MEI and EIA. Assuming the cheaper 800 kWe installations, the SDE+ subsidy of € 90/MWh, current wood chipping prices and co-burning of cheaper residual waste such as reed, the payback time is 3 to 4 years. If the biomass can be contracted for 4 to 5 years at a fixed price, then an investment in a CHP gasifier is definitely an interesting alternative to the current gas CHP installations within the horticulture sector. This feasibility study assumes that the horticulturer’s biomass costs are € 35/tonne for a wood & reed mixture (87.5% and 12.5% respectively) and € 40/tonne for 100% wood chippings, including transport. This assumes € 25/tonne reed removal costs for the supplier, the province of Utrecht, Natuurmonumenten and/or the Forestry Commission (Staatsbosbeheer). In this case these parties do not pay € 35/tonne for the 45 Pagina 50
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