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Reactor Sheeting Detection Using Ultrasonic Interferometry and Acoustic Emission Analysis

IP.com Disclosure Number: IPCOM000012843D
Publication Date: 2003-Jun-02
Document File: 1 page(s) / 20K

Publishing Venue

The IP.com Prior Art Database

Abstract

Novel methods of promptly detecting polymer sheets formed on the interior wall of gas-phase polymerization reactor have been developed. During reactor operation, polymer particles may attach on the reactor wall due to various reasons. Such an attachment can accumulate and develop to form so called "sheet", meaning a layer of agglomerated or melted or half-melted polymer material.

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Reactor Sheeting Detection Using Ultrasonic Interferometry and Acoustic Emission Analysis

Novel methods of promptly detecting polymer sheets formed on the interior wall of gas-phase polymerization reactor have been developed.� During reactor operation, polymer particles may attach on the reactor wall due to various reasons.� Such an attachment can accumulate and develop to form so called “sheet”, meaning a layer of agglomerated or melted or half-melted polymer material.

Our approach involves the use either or both of two methods to detect the appearance of the sheet, i.e., the ultrasonic interferometry or acoustic emission analysis.� For the first method, an ultrasonic transmitter is attached on the exterior wall of the reactor, which introduce ultrasonic waves into the reactor through the metal wall.� The waves can be of either mono-frequency or sweeping-frequency.� The transmitted waves will be partially bounced back by the interior wall of the reactor and the surface of the sheet (if the sheet is formed).� When the sheet is formed, the travel time of waves reflected by the sheet surface is related to the sound speed in the sheet and thickness of the sheet.� The amplitude of those waves is also determined by the property of the sheet.� Those reflected waves interfere with the transmitting waves, and are received by the same transmitter or a separate ultrasonic wave receiver on the exterior wall of the reactor. Therefore, the interferometry spectrum obtained by the rece...