Patent DE-102008006151-A1 (DE)
Title: Device for mixing sludge with polymers, comprises sludge mixing tube, motor-driven mixer having mixing blades arranged in vicinity of mixing tube, supply tube, nozzle device placed in area of opening of supply tube, and polymer-distributor
Inventor: HARTMANN JUERGEN
IPC: C02F11/147
Filed: 2008-01-26
Abstract: The device (100) comprises a sludge mixing tube (110), a motor-driven mixer (130) with mixing blades (120) arranged in the vicinity of the sludge mixing tube, a supply tube (140) sealingly guided through the wall of the mixing tube in the interior area of the mixing tube nearer to a longitudinal axis (111) for supplying the polymers into the interior area of the mixing tube upstream to the mixer, a nozzle device placed in the area of an opening of the supply tube, and a polymer-distributor arranged downstream to the nozzle device of the supply tube. The nozzle device contains a nozzle head. The device (100) comprises a sludge mixing tube (110), a motor-driven mixer (130) with mixing blades (120) arranged in the vicinity of the sludge mixing tube, a supply tube (140) sealingly guided through the wall of the mixing tube in the interior area of the mixing tube nearer to a longitudinal axis (111) for supplying the polymers into the interior area of the mixing tube upstream to the mixer, a nozzle device placed in the area of an opening of the supply tube, and a polymer-distributor arranged downstream to the nozzle device of the supply tube. The nozzle device contains a nozzle head in the area of the ends of the supply tube nearer to the mixer. An upper end of the supply tube lies upstream to the mixer. The mixing blade projects into the interior area of the mixing tube. A partial area of the supply tube nearer to the mixer is guided along the longitudinal axis. The nozzle device adds a radially outwardly pointed flow component to the polymer, so that the polymer not only impinges on the mixing blade but also in the area of the total surface of the mixing blade. The nozzle head is provided with seven bores, through which the polymer discharges from the supply tube. The bores are provided in the area of the periphery of the ends of the supply tube. The polymer-distributor partially diverts the polymer to be mixed to the sludge radially in the direction of the wall of the mixing tube and partially diverts into a direction opposite to the flow direction of the sludge guided in the mixing tube, has a hollow conically formed lower surface turned to the supply tube and is connected with an orifice area of the supply tube. A spring is prestressed, so that the polymer-distributor is supported at the open-sided ends of the supply tube during the absence of the polymer flowing through the supply tube. The polymer-distributor is connected in the central area of its lower surface with the upper end of a thread rod reciprocally mounted in the axial direction of the supply tube. The thread rod is guided in the area of its lower ends through the nozzle head. The spring supported at the nozzle head with its lower end adjoins at the lower surface of the distributor with its upper end. The polymer-distributor prestresses in the direction of the supply tube. The diameter of the supply tube is measured in a quarter of the diameter of the mixing tube. The mixing tube has a diameter of 100 mm and the supply tube has a diameter of 25 mm. The supply tube is guided over a length of 10 cm axially in the mixing tube. The surface of the polymer-distributor is removably arranged about 5 cm upstream from the mixer. The mixing blades of the mixer are arranged on a rotatably mounted shaft, whose central axis is arranged at an angle of 45[deg] related to the central longitudinal axis of the mixing tube.