Performance-based control system
First Claim
1. A method for detecting and controlling cooling system characteristics, said method comprising the steps of:
- measuring a flow rate of make-up cooling medium;
measuring a conductivity of said make-up cooling medium;
measuring a conductivity of a recirculating cooling medium;
determining a treatment compound feed rate based upon the following formula;
##EQU6## where X is a treatment feed rate of a treatment compound, Ω
is a desired concentration of the treatment compound, and K is a constant;
measuring a corrosion rate of the recirculating cooling medium;
determining a desired corrosion rate of the recirculating cooling medium;
calculating a feed rate of a corrosion inhibitor according to the following formula;
space="preserve" listing-type="equation">Y=(X) 1+α
(CORR.sub.MEASURED /CORR.sub.SETPOINT)!, where Y is the feed rate of the corrosion inhibitor, X is as defined above, CORRMEASURED and CORRSETPOINT respectively represent a measured corrosion rate and a set value for corrosion rate, and α
is a cascade factor that varies in a step-wise manner depending upon the value of CORRMEASAURED /CORRSETPOINT and has a value between about 0.0 and about 8.0; and
feeding a corrosion inhibitor at said corrosion inhibitor feed rate.
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Abstract
A method for detecting and controlling cooling system characteristics. A flow rate of make-up cooling medium is measured. A conductivity of the make-up cooling medium is measured. A conductivity of a recirculating cooling medium is measured. A treatment material feed rate is determined based upon the formula: ##EQU1## where X is a treatment feed rate of a treatment compound, Ω is a desired concentration of the treatment compound, and K is a constant. A corrosion rate of the recirculating cooling medium is measured. A desired corrosion rate of the recirculating cooling medium is determined. A feed rate of a corrosion inhibitor is calculated according to the following formula:
Y=(X) 1+α(CORR.sub.MEASURED /CORR.sub.SETPOINT)!,
where α is a cascade factor that varies in a step-wise manner depending upon the value of CORRMEASURED /CORRSETPOINT and has a value between about 0.1 and about 8.0. A corrosion inhibitor is then fed at the corrosion inhibitor feed rate.
130 Citations
28 Claims
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1. A method for detecting and controlling cooling system characteristics, said method comprising the steps of:
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measuring a flow rate of make-up cooling medium; measuring a conductivity of said make-up cooling medium; measuring a conductivity of a recirculating cooling medium;
determining a treatment compound feed rate based upon the following formula;
##EQU6## where X is a treatment feed rate of a treatment compound, Ω
is a desired concentration of the treatment compound, and K is a constant;measuring a corrosion rate of the recirculating cooling medium; determining a desired corrosion rate of the recirculating cooling medium; calculating a feed rate of a corrosion inhibitor according to the following formula;
space="preserve" listing-type="equation">Y=(X) 1+α
(CORR.sub.MEASURED /CORR.sub.SETPOINT)!,where Y is the feed rate of the corrosion inhibitor, X is as defined above, CORRMEASURED and CORRSETPOINT respectively represent a measured corrosion rate and a set value for corrosion rate, and α
is a cascade factor that varies in a step-wise manner depending upon the value of CORRMEASAURED /CORRSETPOINT and has a value between about 0.0 and about 8.0; andfeeding a corrosion inhibitor at said corrosion inhibitor feed rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for detecting and controlling cooling system characteristics, said method comprising the steps of:
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measuring a flow rate of make-up cooling medium; measuring a conductivity of said make-up cooling medium; measuring a conductivity of a recirculating cooling medium; determining a treatment compound feed rate based upon the following formula;
##EQU7## where X is a treatment feed rate of a treatment compound, Ω
is a desired concentration of the treatment compound, and K is a constant;measuring a Fouling Index of the recirculating cooling medium, wherein said Fouling Index is calculated according to the formula;
space="preserve" listing-type="equation">FI=(A){ (T.sub.w T.sub.b)/Power-B!.sub.c - (T.sub.w T.sub.b)/Power-B!.sub.i }+J,where FI=Fouling Index J=(C) (Tb)c)-(Tb)i)!+(D) (Fc -Fi)+(E) (POWERc -POWERi) F=flow rate of cooling medium, A, B, C, D, E, and J=correction factors, Power=power level associated with a wall of the cooling system as heated by a heat source cooled by the cooling system, Tb =bulk fluid temperature of the cooling medium, Tw =wall temperature of a wall of the cooling system, i represents initial readings of the variables in the formulas for FI and J, and c represents current readings of the variables in the formulas for FI and J; determining a desired fouling index of the recirculating cooling medium; calculating a feed rate of a fouling inhibitor according to the following formula;
space="preserve" listing-type="equation">Z=(X) 1+β
(FI.sub.MEASURED /FI.sub.SETPOINT)!,where Z is a feed rate of a fouling inhibitor, X is as defined above, FIMEASURED and FISETPOINT respectively represent a measured value and a set value for Fouling Index, and β
is a cascade factor that varies in a step-wise manner depending upon the value of FIMEASURED /FISETPOINT and has a value between about 0.0 and about 8.0; andfeeding a fouling inhibitor at said fouling inhibitor feed rate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for detecting and controlling cooling system characteristics, said method comprising the steps of:
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measuring a flow rate of make-up cooling medium; measuring a conductivity of said make-up cooling medium; measuring a conductivity of a recirculating cooling medium; determining a treatment feed rate based upon the following formula;
##EQU8## where X is a treatment feed rate of a treatment compound, Ω
is a desired concentration of the treatment compound, and K is a constant;feeding a treatment compound at said treatment feed rate; measuring a corrosion rate of the recirculating cooling medium; determining a desired corrosion rate of the recirculating cooling medium; calculating a feed rate of a corrosion inhibitor according to the following formula;
space="preserve" listing-type="equation">Y=(X) 1+α
(CORR.sub.MEASURED /CORR.sub.SETPOINT)!,where Y is a feed rate of a corrosion inhibitor, CORRMEASURED and CORRSETPOINT respectively represent a measured corrosion rate and a set value for corrosion rate , α
is a cascade factor that varies in a continuous manner depending upon the value of CORRMEASURED /CORRSETPOINT and has a value between about 0.0 and about 8.0; andfeeding a corrosion inhibitor at said corrosion inhibitor feed rate.
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20. A method for detecting and controlling cooling system characteristics, said method comprising the steps of:
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measuring a flow rate of make-up cooling medium; measuring a conductivity of said make-up cooling medium; measuring a conductivity of a recirculating cooling medium; determining a treatment feed rate based upon the following formula;
##EQU9## where X is a treatment feed rate of a treatment compound, Ω
is a desired concentration of the treatment compound, and K is a constant;feeding a treatment compound at said treatment feed rate; measuring a Fouling Index of the recirculating cooling medium, wherein said Fouling Index is calculated according to the formula;
space="preserve" listing-type="equation">FI=(A){ (T.sub.w -T.sub.b)/Power-B!.sub.c - (T.sub.w -T.sub.b)/Power-B!.sub.i }+J,where FI=Fouling Index, J=(C) (Tb)c)-(Tb)i)!+(D) (Fc -Fi)+(E) (POWERc -POWERi) F=flow rate of cooling medium, A, B, C, D, E, and J=correction factors, Power=power level associated with a wall of the cooling system as heated by a heat source cooled by the cooling system, Tb =bulk fluid temperature of the cooling medium, Tw =wall temperature of a wall of the cooling system, i represents initial readings of the variables in the formulas for FI and J, and c represents current readings of the variables in the formulas for FI and J; determining a desired fouling index of the recirculating cooling medium; calculating a feed rate of a fouling inhibitor according to the following formula;
space="preserve" listing-type="equation">Z=(X) 1+β
(FI.sub.MEASURED /FI.sub.SETPOINT)!,where Z is a feed rate of a fouling factor, where FIMEASURED and FISETPOINT respectively represent a measured value and a set value for Fouling Index, β
is a cascade factor that varies in a continuous manner depending upon the value of FIMEASURED /FISETPOINT and has a value between about 0.0 and about 8.0; andfeeding a fouling inhibitor at said fouling inhibitor feed rate.
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21. An apparatus for detecting and controlling conditions in a cooling system, comprising:
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means for measuring a flow rate of a make-up cooling system medium; means for measuring a conductivity of the make-up cooling system medium; means for measuring a conductivity of a recirculating cooling medium; means for determining a treatment material feed rate based upon the formula ##EQU10## where X is a treatment feed rate of a treatment compound, Ω
is a desired concentration of the treatment compound, and K is a constant;means for feeding a treatment material into the cooling system at said determined feed rate; means for measuring a corrosion rate of the recirculating cooling medium; means for determining a desired corrosion rate of the recirculating cooling medium; and means for calculating a feed rate of a corrosion inhibitor according to the following formula;
space="preserve" listing-type="equation">Y=(X) 1+α
(CORR.sub.MEASURED /CORR.sub.SETPOINT)!,where Y is a feed rate of a corrosion inhibitor, where CORRMEASURED and CORRSETPOINT respectively represent a measured corrosion rate and a set value for corrosion rate , α
a cascade factor that varies in a step-wise manner depending upon the value of CORRMEASURED /CORRSETPOINT and has is a value between about 0.1 and about 8.0. - View Dependent Claims (22, 23)
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24. An apparatus for detecting and controlling conditions in a cooling system, comprising:
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means for measuring a flow rate of a make-up cooling system medium; means for measuring a conductivity of the make-up cooling system medium; means for measuring a conductivity of a recirculating cooling medium; means for determining a treatment material feed rate based upon the formula ##EQU11## where X is a treatment feed rate of a treatment compound, Ω
is a desired concentration of the treatment compound, and K is a constant;means for feeding a treatment material into the cooling system at said determined feed rate; means for measuring a fouling index of the recirculating cooling medium, wherein fouling index is calculated according to the formula;
space="preserve" listing-type="equation">FI=(A){ (T.sub.w -T.sub.b)/Power-B/F!.sub.c - (T.sub.w -T.sub.b)/Power-B/F!.sub.i }+J,where FI=Fouling Index, J=(C) (Tb)c)-(Tb)i)!+(D) (Fc -Fi)+(E) (POWERc -POWERi) F=flow rate of cooling medium, A, B, C, D, E, and J=correction factors, Power=power level associated with a wall of the cooling system as heated by a heat source cooled by the cooling system, Tb =bulk fluid temperature of the cooling medium, Tw =wall temperature of a wall of the cooling system, i represents initial readings of the variables in the formulas for FI and J, and c represents current readings of the variables in the formulas for FI and J; means for determining a desired fouling index of the recirculating cooling medium; and means for calculating a feed rate of a fouling inhibitor according to the following formula;
space="preserve" listing-type="equation">Z=(X) 1+β
(FI.sub.MEASURED /FI.sub.SETPOINT)!,where Z is a feed rate of a fouling inhibitor, FIMEASURED and FISETPOINT respectively represent a measured value and a set value for Fouling Index, β
is a cascade factor that varies in a step-wise manner depending upon the value of FIMEASURED /FISETPOINT and has a value between about 0.0 and about 8.0. - View Dependent Claims (25)
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26. An apparatus for detecting and controlling conditions in a cooling system, comprising:
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means for measuring a flow rate of a make-up cooling system medium; means for measuring a conductivity of the make-up cooling system medium; means for measuring a conductivity of a recirculating cooling medium; means for determining a treatment material feed rate based upon the formula ##EQU12## where X is a treatment feed rate of a treatment compound, Ω
is a desired concentration of the treatment compound, and K is a constant;means for feeding a treatment material into the cooling system at said determined feed rate; means for measuring a corrosion rate of the recirculating cooling medium; means for determining a desired corrosion rate of the recirculating cooling medium; means for measuring a fouling index of the recirculating cooling medium, wherein fouling index is calculated according to the formula;
space="preserve" listing-type="equation">FI=(A){ (T.sub.w -T.sub.b)/Power-B/F!.sub.c - (T.sub.w -T.sub.b)/Power-B/F!.sub.i }+J,where FI=Fouling Index, J=(C) (Tb)c)-(Tb)i)!+(D) (Fc -Fi)+(E) (POWERc -POWERi) F=flow rate of cooling medium, A, B, C, D, E, and J=correction factors, Power=power level associated with a wall of the cooling system as heated by a heat source cooled by the cooling system, Tb =bulk fluid temperature of the cooling medium, Tw =wall temperature of a wall of the cooling system, i represents initial readings of the variables in the formulas for FI and J, and c represents current readings of the variables in the formulas for FI and J; and means for determining a desired fouling index of the recirculating cooling medium; wherein if CORRMEASURED >
(G)CORRSETPOINT, wherein G is a correction factor, said determining means determines a feed rate of a fouling inhibitor according to the following formula;
space="preserve" listing-type="equation">Z=(X) 1+β
(FI.sub.MEASURED /FI.sub.SETPOINT)!+(θ
)(CORR.sub.MEASURED /(G)CORR.sub.SETPOINT),where Z is a feed rate of a fouling inhibitor, β
is a cascade factor that varies in a step-wise manner depending upon the value of FIMEASURED /FISETPOINT, where FIMEASURED and FISETPOINT respectively represent a measured value and a set value for Fouling Index, and has a value between about 0.0 and about 8.0 and θ
is a cascade factor that varies in a step-wise manner depending upon the value of CORRMEASURED /(G)CORRSETPOINT, CORRMEASURED and CORRSETPOINT respectively represent a measured corrosion rate and a set value for corrosion rate, and has a value between 0.2 and 2.0. - View Dependent Claims (27, 28)
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Specification