Using Wavelet Decomposition To Determine the Fluidization Quality In a Fluidized Bed Reactor
AssigneeMEMC Electronic Materials, Inc.
InventorsJia Wei Chew, Satish Bhusarapu, Keith E. Weatherford
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Abstract
A method and apparatus for determining the fluidization quality of a fluidized bed reactor is disclosed. The method includes measuring pressure within the fluidized bed reactor to obtain a pressure signal. The pressure signal is then transformed using wavelet decomposition into higher-frequency details and lower-frequency approximations. The dominance of the various features is then calculated based on the energy of each feature in relation to the normalized wavelet energies. The fluidization quality of the fluidized bed reactor is then determined from a comparison over time of the calculated energies.
Claims12
A method of determining fluidization quality of a fluidized bed reactor, the method comprises:
- measuring a pressure differential across the fluidized bed reactor;
- providing the measured pressure differential in the form of a pressure signal;
- transforming the pressure signal by wavelet decomposition into higher frequency details and lower frequency approximations;
- determining energies of the high-frequency details;
- determining energies of the low frequency approximations;
- and
- determining normalized wavelet energies associated with the pressure signal within the fluidized bed to quantitatively determine the fluidization quality.
A method of determining fluidization quality of a fluidized bed reactor, the method comprises:
- providing a reactor vessel defining a reactor chamber, the reactor vessel having a pressure tap connected with the reactor vessel for determining pressure within the reactor chamber and generating a corresponding signal and a processor connected with the pressure tap to receive the pressure signal from the pressure tap, the processor being capable of transforming the pressure signal using wavelet decomposition and calculating energy within the reactor chamber;
- measuring the pressure within the reactor chamber by the pressure tap;
- providing the measured pressure differential from the pressure tap to the processor in the form of a pressure signal;
- transforming the pressure signal by wavelet decomposition into higher frequency details and lower frequency approximations;
- determining energies of the high-frequency details;
- determining energies of the low frequency approximations;
- and
- determining normalized wavelet energies associated with the pressure signal within the fluidized bed.
A fluidized bed reactor for the production of polycrystalline silicon, the fluidized bed reactor comprising:
- a reactor vessel defining a reactor chamber;
- a pressure tap connected with the reactor vessel for determining pressure within the reactor chamber and generating a corresponding signal;
- and
- a processor connected with the pressure tap to receive the pressure signal from the pressure tap, the processor being capable of transforming the pressure signal using wavelet decomposition and calculating energies of the signal.
Dependencies are inferred from the claim text.