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biogas HANDBOOK Feed conveyor screws Feeding co-substrates to the digester can be done by using feed screws or conveyor screws (Figure 7.13). In this case, the material is pressed under the level of the liquid in the digester, using plug screws. The method has the advantage of preventing gas leaking during feeding. The simplest way to do it is to position a dozer on the digester, so that only one insertion screw is necessary. For feeding the screw, temporary storage containers, with and without crushing tools, are used. Figure 7.14 Feed-in system for silage (AGRINZ 2006) 7.4 Armaturesandpipelines The armatures and pipelines used in biogas installations must be corrosion proof and suitable to handle specific types of materials (biogas and biomass). The materials used for pipelines depend on the transported load and pressure level and they include PVC, HDPE, steel and stainless steel. Armatures such as couplings, slide valves, butterfly valves, cleaning openings and manometers must be accessible, easy to maintain and placed frost free. In some cases insulation of pipes is necessary (Figure 7.15). For safe operation of biogas installations, minimum requirements for pipelines and armatures have to be guaranteed, with regard to their material properties, safety features and tightness. Biomass pipelines should have a diameter of 300 mm. Back flow of substrate, from digester into storage tanks, is prevented through appropriate pipeline layout. When installing the pipes, an incline of 1-2% should be maintained, in order to allow complete clearance. Proper sealing of the installation is a must. Long and angled pipelines are susceptible to loose pressure. 72PDF Image | biogas HANDBOOK
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