Upgraded flow guide pipe for olefin fluidized bed polymerization

A process for the polymerization of one or more monomers in a fluidized bed reactor, the reactor comprising a reaction zone delimited at a lower side by a gas distribution plate and at a top side by a virtual end face, in which reaction zone a fluidized bed is maintained between the lower side and the top side, at least a portion of the gaseous stream discharged from the top of the reactor in the reaction zone is cooled to a point at which the stream is partially condensed into a liquid, and at least a portion of the two-phase stream generated in the reaction zone is recycled to the reactor via an inlet terminating in the reactor below the gas distribution plate, the reaction zone of the reactor is divided into two compartments by a flow guide tube extending from a point located above the gas distribution plate to a point located below the end face such that the area ratio of the circumferential flow guide tube inlet area (Ahb) to the annular area (Aa) is between 0.5 and 3, preferably 2. 用于在流化床反应器中聚合一种或多种单体的处