Agitating – Having interrelated feed and discharge means – Recirculating from and to mixing chamber
Patent
1995-02-21
1999-07-20
Soohoo, Tony G.
Agitating
Having interrelated feed and discharge means
Recirculating from and to mixing chamber
366140, 3661521, 3661602, 137 93, B01F 1502, G05D 1108
Patent
active
059247940
ABSTRACT:
A chemical blending system for blending two or more constituent chemicals to a desired concentration. One embodiment of the system includes a mix tank, a recirculation line having an inlet and an outlet in the tank, and a pump in the recirculation line for recirculating and mixing the blended chemical. A source of diluent is fluidly coupled to the mix tank through a diluent inlet and supply line. A source of concentrated chemical is fluidly coupled to the recirculation line through a concentrated chemical inlet, supply line, and an adding valve located in the recirculation line between the inlet and pump. A conductivity-type sensor in the recirculation line provides continuous measurements of the blended chemical concentration. A titration analyzer is coupled to the recirculation line to provide periodic blended chemical concentration measurements. A programmable logic control system including a processor and associated memory is coupled to the adding valve, conductivity-type sensor and titration analyzer. A blending control program and process control values are stored in the memory. The processor executes the blending control program and controls the concentrate adding valve as a function of the concentration measurements provided by the conductivity-type sensor and titration analyzer to blend the chemical to the desired concentration.
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Grant Donald C.
Lemke Travis A.
O'Dougherty Kevin T.
FSI International Inc.
Soohoo Tony G.
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