Method of applying non-linear dynamics to control a gas-phase polyethylene reactor operability
First Claim
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1. A method of determining a reactor continuity comprising the steps of:
- a. measuring system variables of the reactor during a time period to generate data, said variables comprising an acoustic emission, a differential pressure, a bed total pressure drop, a fluidized bulk density, a static voltage and a skin thermocouple measurement;
b. filtering said data;
c. calculating a signal from said filtered data employing chaotic non-linear dynamics wherein said signal comprises entropy, cycle time or mean deviation (MD); and
d. comparing said calculated signal for said reactor to a calculated signal of a control reactor to detect reactor continuity comprising, detecting fluidization changes in the reactor, detecting sheeting or identifying sheeting precursors;
wherein said reactor is an ethylene gas-phase polymerization reactor.
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Abstract
The present invention describes a method for determining reactor continuity of a polymerization reactor by non-linear dynamics. Specifically, the invention relates to a method of analyzing system variables to indicate gas phase reactor continuity in real-time and controlling the reactor continuity to maintain operability.
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Citations
27 Claims
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1. A method of determining a reactor continuity comprising the steps of:
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a. measuring system variables of the reactor during a time period to generate data, said variables comprising an acoustic emission, a differential pressure, a bed total pressure drop, a fluidized bulk density, a static voltage and a skin thermocouple measurement; b. filtering said data; c. calculating a signal from said filtered data employing chaotic non-linear dynamics wherein said signal comprises entropy, cycle time or mean deviation (MD); and d. comparing said calculated signal for said reactor to a calculated signal of a control reactor to detect reactor continuity comprising, detecting fluidization changes in the reactor, detecting sheeting or identifying sheeting precursors; wherein said reactor is an ethylene gas-phase polymerization reactor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of determining a reactor continuity comprising the steps of:
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a. measuring system variables of the reactor during a time period to generate data, said variables consisting essentially of an acoustic emission, a differential pressure, a bed total pressure drop, a fluidized bulk density, a static voltage and a skin thermocouple measurement; b. filtering said data; c. calculating a signal from said filtered data employing chaotic non-linear dynamics wherein said signal comprises entropy, cycle time or mean deviation (MD); and d. comparing said calculated signal for said reactor to a calculated signal of a control reactor to detect reactor continuity comprising, detecting fluidization changes in the reactor, detecting sheeting or identifying sheeting precursors; wherein said reactor is an ethylene gas-phase polymerization reactor.
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Specification