Polyethylene device reactor seed bed dehydration replacement device and method

Abstract

The invention discloses a polyethylene device reactor seed bed dehydration replacement device. The device includes a seed bed treatment tank, a jacket temperature control apparatus is mounted outsidethe seed bed treatment tank, the bottom of the seed bed treatment tank is communicated with an output pipe, two ends at the top of the seed bed treatment tank are respectively communicated with a seedbed adding pipe and an emptying line pipe, a mixing device for stirring polyethylene powder is mounted in the seed bed treatment tank, and a nitrogen adding assembly for filling nitrogen is mounted on the output pipe. When the device is used, only the output pipe in the dehydration device needs to be installed on a reactor seed bed adding pipe, impurities input into the seed bed in the reactor can be rapidly removed, meanwhile, a recycle gas compressor and a purge gas compressor do not need to be started, the service life of equipment can be prolonged, the shutdown time can be shortened, andnitrogen consumption can be reduced.

Description

technical field [0001] The invention relates to the technical field of polyethylene powder dehydration replacement, in particular to a polyethylene device reactor seed bed dehydration replacement device and method. Background technique [0002] The Unipol gas-phase full-density polyethylene process occupies a leading position in the world's gas-phase polyethylene process. At present, there are more than 40 sets of Unipol polyethylene plants built in my country, which is the largest number of sets and the largest production capacity among all kinds of polyethylene processes in my country. A sort of. [0003] Before starting up the Unipol gas-phase full-density polyethylene plant, it is necessary to pre-load a certain height of polyethylene powder into the reactor, which is called a seed bed. Due to design reasons, the delivery of the seed bed to the reactor in more than 20 sets of devices in the built device is completed by an air blower, which leads to the inevitable contact...

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Problems solved by technology

However, this method takes a long time and consumes a lot of nitrogen, which leads to a long time before the replacement of the Unipol gas-phase full-density polyethylene plant is qualified. Therefore, effective dehydration and replacement of the seed bed is a key link to shorten the shutdown time and reduce the nitrogen consumption. Therefore, we propose a polyethylene device reactor seed bed dehydration replacement device and method

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