Detection of anomalies in gas fluidized bed polymerization
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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Abstract
A process for detecting anomalies in a fluidized bed, e.g. the incidence of agglomeration in gas-fluidized bed polymerization, comprises sensing and converting into electrical signals the pressure at one level, or the pressure difference between two or more levels in the reactor, processing these signals by computer to produce a pressure spectrum and comparing with a reference spectrum obtained in the absence of anomalies. The device comprises one or more pressure sensors 11,12,13, which measure the pressure at various levels in the reactor 1, and a computer 27.
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Citations
13 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for detecting anomalies in a fluidised bed contained in an enclosure and controlling the conditions in said bed comprising:
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at least one pressure sensor which measures the pressure at least at one level in the fluidised bed and provides analog signals corresponding to the pressure; processing means for processing the analog signals produced by the said pressure sensor and providing output signals at frequencies above the signal frequencies present when the fluidised bed is operating under normal conditions; and means connected to said processing means and responsive to said signals at frequencies above said signal frequencies under normal conditions for indicating the presence of anomalies of operation in the said fluidised bed. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification