Evaluation of improvements in end-conversion efficiency for bioenergy production

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Evaluation of improvements in end-conversion efficiency for bioenergy production ( evaluation-improvements-end-conversion-efficiency-bioenergy- )

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56 these regional manure digestion plants since a minimum scale is required from an operational point of view. These plants include typical capacities of 1.5 – 3 MWe, based on one or more gas engines; statistic data on this are not available. The investment cost for anaerobic (co)digestion of manure is typically between the € 3,000 - € 4,000 per kWe [15], but may range from €2,500 up to €7,500 per kWe [2]. This is determined by the level of automation, facilities for sanitation of digestate, storage facilities, etc. Example: Manure co-digestion plant What Where Capacity Efficiency Fuel Start-up Cost Manure co-digestion CHP Beltrum, Netherlands 0.44 MWe • 37 % (electric, engine) Manure + co-substrates 2005 2 million Euro Contracting firm Groot Zevert and project developing company Evelop have retrofitted an existing manure tank into a co-digestion plant. Manure and co-substrates are fed to the digester, resulting in the production of biogas. The biogas is combusted in a gas engine, connected to a generator of 440 kWe. Electricity is supplied to the grid. Heat is only used for the digestion process itself and the pasteurization of digestate. Currently, an expansion of the capacity and the supply production of ‘green gas’ are in preparation. The ‘green gas’ will be transported with a 6 km pipe line to a dairy food plant where the gas is fired in a steam boiler, replacing natural gas. 2.8.3 Efficiency and improvement opportunities Compared to technologies using dedicated biomass feedstock, the efficiency of an anaerobic manure digestion plant is more difficult to determine. Moreover, comparing the efficiency of manure digestion plants with other technologies is doubtful since manure digestion has an additional function as waste-treatment. The efficiency for a gas engine is a weak function of the capacity of the engine. Newer engines tend to be a couple of percents more efficient than older (< 10 years old) ones. The most significant improvement of the overall efficiency is the utilization of heat from the motor cooling (water of temperatures between 80 – 110 degrees can be obtained). For digestion plants, only part of the heat is required for the digestion process, dependent on the type of digestion. In some cases, the digestate is pasteurized to allow transport between countries, so more heat is required for the process. From this can be concluded that the percentage of heat that is required for the process differs. However, even for processes with a high heat demand, at least 50% of the heat is EVALUATION OF IMPROVEMENTS IN END-CONVERSION EFFICIENCY FOR BIOENERGY PRODUCTION

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