B - Operations – Transporting – 04 – C
Patent
B - Operations, Transporting
04
C
B04C 11/00 (2006.01) B01D 21/00 (2006.01) B01D 21/26 (2006.01) G01F 1/66 (2006.01)
Patent
CA 2473046
The invention concerns an acoustic sensor (44) for identifying obstruction of a circular grit trap for recycling fine sand in an industrial water clarifying plant. The circular grit trap comprises a cylindrical body having an outer wall and having at one first end a first sand-containing fluid inlet for receiving sludge and fine sand and a first overflow outlet of fluid not containing sand orthogonal to the fluid inlet, to evacuate said sludge, and at a second end a second sand-containing fluid underflow outlet coaxial with the first fluid outlet, to recover said sand. The acoustic sensor is sensitive to the noise radiated by the flow of the sand-containing fluid in the circular grit trap and is applied against the outer wall of the cylindrical body of the circular grit trap, in the plane of the fluid inlet but not coaxially therewith. Said acoustic sensor transmits a warning signal when an abnormal amplitude variation of sound level is measured in the bands of 1/3 octave centered on frequencies of 25 Hz or 200 Hz.
Sonde acoustique (44) pour identifier le blocage d'un hydrocyclone pour recycler le sable fin utilis~ dans une unit~ de clarification d'eau industrielle. L'hydrocyclone comprend un corps cylindrique ayant une paroi ext~rieure et ayant ~ une premi~re extr~mit~ une entr~e de fluide sablonneux, pour recevoir des boues et du sable fin une premi~re sortie surverse de fluide non sablonneux orthogonale ~ l'entr~e de fluide, pour ~vacuer ces boues, et ~ une seconde extr~mit~ une seconde sortie souverse de fluide sablonneux coaxiale ~ la premi~re sortie de fluide, pour r~cup~rer ce sable. La sonde acoustique est sensible au bruit rayonn~ par l'~coulement du fluide sablonneux dans l'hydrocyclone et est appliqu~e contre la paroi ext~rieure du corps cylindrique de l'hydrocyclone, dans le plan de l~entr~e de fluide mais non coaxialement ~ celle-ci. Cette sonde acoustique transmet un signal d'alerte lorsqu'une variation hors norme d'amplitude du niveau sonore est mesur~e dans les bandes de 1/3 d'octave centr~es sur des fr~quences de 25 Hz ou de 200 Hz.
Binot Patrick
Gadbois Alain
Germa Georges
John Meunier Inc.
Lesperance & Martineau S.e.n.c.
Otv S.a.
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