Wash Water Spray Manifolds Tested

Michael Saska  |  9/8/2007 12:31:22 AM

The sugar quality is an area of much interest to the Louisiana sugarcane industry, and the effects of washing the sugar in the centrifugals, different boiling schemes for production of VLC sugar and sugar quality changes during storage are being investigated at Audubon Sugar Institute (ASI) with the support of the Louisiana sugar mills. In one of the factories, in preparation for the 2007 season, all wash water spray manifolds were removed from the centrifugals, brought to Audubon and their flow characteristics tested. See table below:

Characteristics of manifolds removed from seven 48" x 36" batch centrifugals.  Water flow rate in L/sec at 50 psi pressure.

0.54

0.65

0.35

0.61

0.34

0.33

0.30

Considerable differences in the flow through the various 9-nozzle manifolds, all taken from the identical 48” x 36” batch machines were found, because of nozzles with different size orifices were used and some nozzles were partially or completely blocked.

The proper sugar washing is essential for good factory performance: under-washing leads to high color and low Pol sugar, over-washing will increase sugar recirculation and loss. It is important therefore to periodically inspect and maintain the nozzles. If one nozzle is clogged, by pipe rust accumulation or other debris, chances are other nozzles will be plugged sooner or later. All nozzles should be periodically removed, manifolds flushed and the nozzles cleaned. The angles of the nozzles need to be checked and adjusted according to the manufacturer’s recommendations. Attention also needs to be given to the length of the manifolds: a good coverage depends not only on the angles of the nozzles but also on the vertical elevation of the manifold with respect to the basket.

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