Patent ID: 6531056
Filing Date: 2003-03-11
Classification: B01F,Y10T

Abstract:
A system for automatic control of the dissolution rate of treating chemical in a liquid line comprisinga process line (200) having an upstream portion (202) of untreated liquid and a downstream section (204), treating means (201) for treating a portion of said untreated liquid from said upstream portion (202) of said process line (200), said portion of untreated liquid flowing at constant flow rate, said treating means including means responsive to a variable control signal for varying a chemical dissolution rate of treating solid chemical material which is soluble in said portion of untreated liquid to discharge treated liquid of a variable treating chemical dissolution rate into said downstream section, a flow meter in said upstream portion (202) of said process line (200) which produces a flow rate signal, a residual measurement probe (208) in said downstream section (204) of said process line (200) which produces a residual measurement signal, a device for generating a control setpoint signal representative of a desired level of treating chemical in said downstream section (204), means (209), (207) (213) for applying said flow rate signal, said residual measurement signal and said setpoint signal to a computer (210), said computer (210) arranged and designed to generate said variable control signal as a function of said flow rate signal, said residual measurement signal and said setpoint signal, and means (211) for applying said variable control signal to said means for varying said chemical dissolution rate.