Method for the in-situ cleaning of the catalytically active surfaces of SCR substrate
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United States of America Patent
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Sep 24, 2002
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app pub date -
Nov 28, 2000
filing date -
Nov 29, 1999
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Abstract
A method and apparatus for cleaning the catalytically active surfaces of selective catalytic reduction (SCR) substrate, and more particularly such a method and apparatus which: simultaneously generates two differing frequency sound waves which are effective in cleaning such surfaces, more effectively than if only single waves of such frequency were generated; utilizing spaced arrays of sound emitters at the entry and exit sides of selected SCR layers, with the emitters on opposite sides of the layers being in counter phase, or opposed synchronization; teaches design and placement of sound sources which optimize a variety of output cleanability predictions, for example pulsating pressure distribution, pulsating velocity distribution (U, V, W), time-averaged parameters and measure of cleanability.
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