GAS DISTRIBUTION PLATE FOR FLUIDIZED-BED OLEFIN POLYMERIZATION REACTORS EQUIPPED WITH FLOWRATE OR PRESSURE SENSORS TO DETECT GRID FOULING

摘要

A gas distribution plate for a fluidized bed olefin polymerization reactor is provided. In addition to the holes for distributing the fluidizing gas, the plate includes a plurality of cavity shaped protrusions for introducing fluid into the fluidized bed reactor. The cavity-like protrusion, which may be a tube or a pipe, extends toward the fluidized bed above the plate and provides many uses. The protrusions may break or penetrate the falling polymer aggregate or sheet. They may have a flow or pressure sensor that senses a decrease in flow velocity along the protrusion or an increase in pressure drop and that indicates the presence and / or size of the falling polymer aggregate or sheet. The protrusions can also break the agglomerates or sheets into smaller pieces by direct injection of fluid into the agglomerates or sheets. The protrusions may also be used to infuse the dropping agglomerate or sheet, or the polymerization terminator into the collapsed portion of the layer, to increase the rate of penetration of the stopper into the agglomerate, sheet or collapse portion.