Method for measuring reactor bed level from active acoustic measurement and analysis
First Claim
1. A method to determine the fill level of material inside a vessel comprising relating a shift of the natural frequencies of wall vibrations to fill level wherein a relationship between frequency shift of wall vibrations and fill level is determined bya) inducing vibration on the wall in said vessel from an external source,b) measuring the vibration signals on the wall of said vessel as a function of frequency,c) relating frequency to the fill level.
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Abstract
The present invention is a non-intrusive method to determine the fluid level in a vessel. In a preferred embodiment, the vessel is a delayed coker drum in a refinery. Waves are generated in the vessel from an outside source. For wall vibration generated in the frequency range of 1-20,000 Hz, accelerometers on the exterior wall of the vessel measures the frequency of the vibration modes of the vessel. The fluid level can be related to the frequency of the vibration mode.
27 Citations
14 Claims
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1. A method to determine the fill level of material inside a vessel comprising relating a shift of the natural frequencies of wall vibrations to fill level wherein a relationship between frequency shift of wall vibrations and fill level is determined by
a) inducing vibration on the wall in said vessel from an external source, b) measuring the vibration signals on the wall of said vessel as a function of frequency, c) relating frequency to the fill level.
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13. A method to determine the fill level of material inside a vessel comprising relating attenuation of wall vibrations to fill level wherein a relationship between the attenuation of wall vibrations and fill level is determined by
a) inducing vibration on the wall in said vessel from an external source, b) measuring the vibration signals on the exterior wall of said vessel as a function of frequency, c) selecting a vibration mode d) relating amplitude of vibration mode to the fill level.
Specification