Unipol gas-phase polyethylene condensing mode control analysis and operation optimization
The causes of fluctuations in the reaction system during the in condensing process of Unipol gas-phase polyethylene condensing mode were analyzed,and a control strategy was set out that the liquid phase content at the reactor inlet should be increased while the solid content be reduced as much as possible during the switch of condensing modes.The influential factors of solid and liquid contents at the reactor inlet were analyzed to determine low-density grades to start the process,and stepping up the reaction load,increasing the iso-pentane content and lowering the circulating gas velocity were adopted to rapidly bring down the reactor inlet temperature,raise the dew point of the circulating gas,and reduce the amount of fines entrainment.Meanwhile,the optimization methods and precautions for in condensing operation were summarized to realize the smooth and quick switch between different condensing modes.
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