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biogas HANDBOOK

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biogas HANDBOOK ( biogas-handbook )

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biogas HANDBOOK 7.3.2 Transportofstackablefeedstock Stackable feedstock like grass, maize silage, manure with high straw content, vegetable residues etc. must to be transported from a storage facility (bunker silo) to the digester feed- in system. This is usually done by loaders or tractors (Figure 7.10 and 7.11) and the feedstock is fed into the digester using e.g. a screw pipe transporting system, like the ones shown in Figure 7.12. The feed-in system includes a container, where stackable feedstock is poured by tractor, and a transport system, which feeds the digester. The transport system is controlled automatically and consists of scraper floors, walking floors, pushing rods and conveyor screws. Scraper floors and overhead push rods are used to transport feedstock to the conveyor screws. They are capable of transporting nearly all stackable feedstock, either horizontally or with a slight incline, and are therefore used in very large, temporary storage containers, but they are not suitable for dosing. Conveyor screws can transport feedstock in nearly all directions. The only precondition is the absence of large stones and other physical impurities. For optimal function, coarse feedstock should be crushed, in order to be gripped by the screw and to fit into the screw windings. Figure 7.10 Feed-in container system for dry feedstock -maize silage and solid poultry manure- (left) and loader with maize silage (right) (RUTZ 2008) Figure 7.11 Loader feeding maize silage into a container (RUTZ 2008) 70

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