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Detection of anomalies in gas fluidized bed polymerization

  • US 4,858,144 A
  • Filed: 02/12/1987
  • Issued: 08/15/1989
  • Est. Priority Date: 02/19/1986
  • Status: Expired due to Term
First Claim
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1. A process for detecting anomalies in a fluidised bed contained in an enclosure and preventing further development of such anomalies comprising:

  • at least intermittently sensing the pressure at at least one level in the fluidised bed, the pressure being sensed by at least one pressure sensor which produces an analog signal;

    determining the normal spectrum of frequencies present in the said signal when the fluidised bed operates under normal conditions free from anomalies;

    detecting the appearance in the said signal of frequencies distinct from, and higher than, frequencies in said normal spectrum which correspond to the presence of anomalies in the fluid bed; and

    modifying the fluid bed conditions causing the anomalies upon detection of said frequencies distinct from the frequencies in said normal spectrum to prevent continuation of the increase of said anomalies.

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