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Solids handling for intensified process technology

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Solids handling for intensified process technology ( solids-handling-intensified-process-technology )

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IbD PU Deliverable 3.1  Gas-solid separation Heat and mass transfer in a vortex reactor can be significantly improved by the high radial and tangential gas-solid slip velocities. As in the conventional rotating fluidized bed reactor, the centrifugal forces make the vortex reactor a useable device in gas-solid separation. The relatively small bed thickness and high gas flow rate also lead the gas-solid contact time to be short in the reactor. The gas particles that are injected into the chamber exert both radial and tangential forces which causes the radial and tangential motion of the gas and leads to the two direction fluidization of the particle bed. De Wilde and de Broqueville (2008) presented the experimental provident of the concept of a rotating fluidized bed in a static geometry in different experiment conditions. Good gas-solid separation using a vortex reactor was found in both polymer and salt particles. However, the solid losses via the center chimney are more pronounced in the salt particle test. Kang et al. (2006) tested the capability of a swirling fluidized-bed reactor for pyrolysis for the recycling of polystyrene plastic (PSP) wastes. The reactor used in this study was not a typical vortex reactor, however, the swirling flow pattern (vortex flow pattern) was formed by injecting a swirling gas (secondary) tangentially into the reactor at the wall of the reactor. The waste PSP was effectively decomposed by the swirling motion in the reactor, which gave further evidence of the good separation in the vortex reactor (rotating fluidized bed in static configuration). A US Patent 8110155 B2 from 2012 (Fridman et al., 2012) assigned to Drexel University (US) and Board of Trustees of the University Of Illinois (US) presented a vortex reactor including a downwardly oriented frustum-shaped reaction chamber. The patent describes how the vortex reactor including the apparatus for creating axial and circumferential gas flow could be used for generating plasma and processing particulate solids in the reaction chamber. Eliaers et al. (2014) designed and built a vortex chamber that could generate a strong high-G field and thus a sufficiently high particle residence time (Figure 26). A centrally positioned spray nozzle direction towards the bed was placed in the chamber for fluidization and low temperature coating of cohesive particles. In the test, the gas-solid mass and heat transfer and the shear in the particle bed were intensified by the increasing of gas flow rate. The 29

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