Process and device for continuously drying protein-containing sludge
AssigneeAndritz Patentverwaltungsgesellschaft M.B.H.
InventorsPeter Gaiser, Ulrich Plantikow, Dieter Kowalczyk
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Abstract
A process and a device for continuously drying protein-containing sludge, in particular sewage sludge, in a fluidised bed (20) inside a drying container (13). A drying gas flows through the fluidised bed (20) while partially de-watered sludge (6) in granulate form (21) is added to the fluidised bed (20) while dried sludge (10) is withdrawn therefrom. The granules (21) are formed without admixture of dried substances and are granulated preferably at the same time as they are pressed. Sewage sludge may thus be dried without admixture or recycling of dried substances, so that a highly efficient plant is obtained. In addition, a granulated dry material is produced which may be used in various ways.
Claims32
A process for continuously drying protein-containing sludge in a fluidized bed (20) through which a drying gas flows, wherein partially de-watered sludge (6) is added to the fluidized bed (20) in granulate form (21) and dried sludge (10) is removed therefrom,
- wherein the granules are formed without the addition of dried substances and are applied to the fluidized bed (20) immediately following their production and are mixed with granular particles throughout various stages of drying contained in the fluidized bed.
A device for continuously drying protein-containing sludge in a fluidized bed (20), comprising
- a drying container (13) which includes a lower receiving chamber (18) for drying gas and a gas-permeable support (19) for the fluidized bed (20),
- a feeding component (14) for feeding partially de-watered sludge (6) and a withdrawing component (17) for withdrawing the dried sludge (10),
- said feeding component (14) having a granulating component (14a) adapted to apply the produced granules immediately to the fluidized bed (20) in which the granules are mixed with granular particles throughout the various stages of drying contained in the fluidized bed (20), and
- said feeding component (14) does not include a means for admixing dried substances.
Dependencies are inferred from the claim text.