Improvement of manner for introducing condensation agent into fluidised bed polymerisation reactor and device

Abstract

The invention discloses an improvement of introducing the way of a condensing agent into a fluidized bed polymerization reactor and a device thereof. The improvement comprises the following steps that: a circulating airstream is exported from the top of the fluidized bed and is compressed as well as condensed and separated to form a main portion and a small portion rich in condensed fluid, the main portion flows back to the bottom of the fluidized bed, a jet pump is adopted, a reaction feed gas is taken as a power airstream, the condensed fluid with a content occupying 30 to 100 weight percentof the total content of the condensed fluid in the circulating airstream and the reaction feed gas are jetted to the upper part of a gas distributing plate inside the fluidized bed, the power of thejet pump is adopted to draw off the condensed fluid effusion at the bottom of the fluidized bed back to the upper part of the gas distributing plate. The improvement can greatly increase the quantityof the condensed fluid which returns to the fluidized bed reactor from the upper part of the distributing plate and avoids the phenomenon of the effusion at the bottom of the fluidized bed; meanwhile,the reaction feed gas is taken as the power fluid body of the jet pump, the energy inside the system is used comprehensively, the production ability is greatly increased, therefore, the improvement has great operation significance and the application value.

Description

technical field [0001] The invention relates to a method and a device for introducing a condensing agent into a fluidized bed polymerization reactor, in particular to an improvement of a method for introducing a condensing agent into a fluidized bed olefin polymerization reactor and the device thereof. Background technique [0002] In modern life, polyolefin resins are inseparable from the basic necessities of human beings. From simple packaging bags to complex aircraft components, polyolefin resins are playing an irreplaceable role, especially polyethylene resins, due to their excellent physical and chemical properties , Simple forming and processing and relatively cheap price, etc., the output and product application consumption are among the best. There are three main methods for industrial production of polyethylene: slurry polymerization, solution polymerization and gas phase polymerization. Among them, the gas phase polyethylene process has the advantages of simple pr...

AI Technical Summary

Problems solved by technology

If the content of condensate in the circulating air stream is further increased, it may cause liquid accumulation at the bottom of the fluidized bed

At the same time, the stream enriched with condensate in this patent returns to the fluidized bed reactor only by the kinetic energy obtained from the compressor. If the amount of condensate in the stream increases, the density of the stream increases and returns to the fluidized bed. The kinetic energy required for the reactor also increases

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