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EP0385789A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Passive acoustics process for monitoring fluidized bed flow

Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1990-03-01
•
Granted: —
•
Expires: 2010-03-01
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Abstract

Abstract A method is described for the non-intrusive determination of flow anisotropy through the cross-­section of a two phase fluid bed reactor. The method involves measuring wall vibrations of the reactor at several positions spaced circumferentially around the reactor, and determining the power spectrum as a function of frequency. The area of the power spectrum under a resonance peak for each position is determined, and a change in the area of the power spectrum between adjacent positions is correlated with flow anisotropy through the cross-sectional plane of the circumference of the reactor on which the said positions are located. The foregoing may be repeated for another cross-­sectional plane, and a change in the area of the power spectrum between adjacent positions in one plane is compared with the corresponding area between adjacent positions in the other cross-sectional plane, and the difference in changes in the two planes is correlated with a change in bed density.

Inventors

  • 👤 George Dewey Cody
  • 👤 Eugene Robert Elzinga, Jr.
  • 👤 Charles Lambert Baker, Jr.

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 15:22
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1809; G; G01; G01N; G01N29/00; G01N29/14; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; G01N2291/00; G01N2291/02; G01N2291/024; G01N2291/02408; G01N2291/02416; G01N2291/028; G01N2291/02818; G01N2291/02836; G01N2291/04; G01N2291/042; G01N2291/0421

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 100 words
A method for the non-intrusive deter­mination of flow anisotropy through a two phase fluid bed in a structure comprising: (a) measuring wall vibrations of said structure and then determining the power spectrum as a function of frequency, said wall vibrations taken at several first positions circumferentially about the structure, (b) determining the area of the power spectrum under a resonance peak for each of said first positions, (c) correlating a change in said area between adjacent first positions of the power spectrum with flow anisotropy through the cross-section of said structure bounded by the circumference including said several first positions.
Claim 2
Independent Claim 100 words
A method for the non-intrusive deter­mination of flow anisotropy through a two phase fluid bed in a structure comprising: (a) measuring wall vibrations of said structure and then determining the power spectrum as a function of frequency, said wall vibrations taken at several first positions circumferentially about the structure, (b) determining the area of the power spectrum under a resonance peak for each of said first positions, (c) correlating a change in said area between adjacent first positions of the power spectrum with flow anisotropy through the cross-section of said structure bounded by the circumference including said several first positions.
Claim 3
Dependent Claim 117 words
The method of claim 1 comprising the steps of: (i) measuring wall vibrations of said structure and then determining the power spectrum as a function of frequency, said wall vibrations taken at several second positions circumferentially about the structure, said second positions spaced vertically from said first position in said structure, (ii) determining the area of the power spectrum under a resonance peak for each of said second positions, (iii) comparing a change in said area of said power spectrum between adjacent first positions with the change between said area of said power spectrum between corresponding second positions and correlating difference between the changes in said area of the power spectrum with a change in bed density.
Claim 4
Dependent Claim 21 words
The process of claim 1 or claim 2 wherein said step of measuring wall vibrations is performed by using an accelerometer.
Claim 5
Independent Claim 19 words
The method of any one of claims 1 to 3 wherein said structure is a fluid bed coker reactor.
Claim 6
Independent Claim 19 words
The method of any one of claims 1 to 3 wherein said structure is a fluidized bed catalytic cracker.

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