Feeding system of solid polyolefin catalysts

Abstract

The invention discloses a feeding system of solid polyolefin catalysts. The feeding system comprises a catalyst tank and a rotary feeder; a feed outlet of the catalyst tank is connected with the upperpart of the rotary feeder through a first pipeline; the lower part of the rotary feeder is connected with a second pipeline; the first pipeline and the second pipeline are provided with valves; the rotary feeder comprises a housing, a ball body, and a connecting shaft; a cavity is formed in the housing; the surface of the ball body is provided with a circular groove; the ball body is arranged inthe cavity, is pressed against the cavity firmly, and is capable of rolling in the cavity along the transverse direction axis; the connecting shaft is arranged on the transverse direction axis of theball body; the housing is provided with a hole corresponding to the connecting shaft; and the connecting shaft is designed to penetrate the hole. The pipeline on the tank bottom of the catalyst tank of the feeding system is provided with the rotary feeder, and catalyst charging amount can be controlled through adjusting the rotating speed of the rotary feeder, so that continuous, accurate, and stable introduction of solid catalysts into a polymerization reactor can be realized using the feeding system.

Description

technical field [0001] The invention relates to the field of olefin polymerization, in particular to a feeder for a granular solid polyolefin catalyst and a matching catalyst feed system. Background technique [0002] At present, most of the catalysts used in olefin polymerization in industry are solid particle type, and the feeding of this solid particle type catalyst is usually added by a specially designed catalyst feeding device, such as the solid catalyst feeding device adopted on the Unipol polyethylene device; there is also a After a complex preparation process, the catalyst is prepared into a certain concentration of slurry or paste, and then sent into the reactor with a metering system. In the above two methods, the equipment investment of the former is very high, the adding process is easy to block, and there is no accurate and effective method to know the catalyst content in the catalyst feeder. The preparation process of the latter is extremely complicated, and ...

AI Technical Summary

Problems solved by technology

This invention can realize small dose of powder feeding, but the material is easy to deposit on the inner wall of the material channel, resulting in measurement error

[0005] Chinese patent CN101811011A discloses a catalyst automatic feeding method. The fluidization conveying air pipeline is set to continuously feed the fluidizing conveying air into the feeder. A fluidizing conveying air regulating valve and a flow meter are arranged on the fluidizing conveying air pipeline. Feeding regulating valve, a connecting pipe is set between the top of the feeder and the pipe section of the discharge pipe near the outlet of the discharge valve. , the catalyst circulates in the connected circulation loop at the top of the feeder, which reduces the deposition and clogging during the catalyst delivery process, and the problem of unstable feeding, but the circulation device of this equipment is set on the top of the feeder, and strong fluidization is required during the circulation process Conveying air, the device generally uses compressed air as the fluidized conveying air

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