CA2415685A1 - Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler - Google Patents

Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler Download PDF

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Publication number
CA2415685A1
CA2415685A1 CA002415685A CA2415685A CA2415685A1 CA 2415685 A1 CA2415685 A1 CA 2415685A1 CA 002415685 A CA002415685 A CA 002415685A CA 2415685 A CA2415685 A CA 2415685A CA 2415685 A1 CA2415685 A1 CA 2415685A1
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CA
Canada
Prior art keywords
phosphate
boiler
sodium
boiler water
feed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002415685A
Other languages
French (fr)
Other versions
CA2415685C (en
Inventor
John C. Gunther
Scott M. Boyette
Eric A. Thungstrom
Norman B. Worrell
Paul R. Burgmayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suez WTS USA Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/321,338 external-priority patent/US5696696A/en
Application filed by Individual filed Critical Individual
Publication of CA2415685A1 publication Critical patent/CA2415685A1/en
Application granted granted Critical
Publication of CA2415685C publication Critical patent/CA2415685C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Control Of Non-Electrical Variables (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

A control system for automatically achieving and maintaining a desired sodium/phosphate ratio and phosphate concentration of the boiler water in an industrial. boiler for minimizing corrosion. The system uses an adaptive controller that models the boiler which enables the system to predict boiler pH and phosphate concentrations at any future time given the feed rates, feed concentrations of high and low sodium/phosphate stocks, blowdown rate, mass of the boiler water, initial boiler phosphate concentration and initial pH. Once these future concentrations are determined, the controller then determines which feed rates will return the current boiler water state to, and then maintain the boiler water at, the desired sodium/phosphate congruency ratio in the least amount of time. Where the controller determines that it is not possible to move the current boiler water state to the desired congruency setpoint, the controller determines a feed rate program that will move the current boiler water state to the attainable steady state point closest to the desired setpoint. An alternative embodiment fixes the phosphate concentration by ratioing the phosphate feed with the blowdown rate while continuously monitoring blowdown pH. This arrangement allows for the control of sodium by switching between the high and low ratio sodium/phosphate stocks based on the measured pH with respect to the pH setpoint.
CA002415685A 1994-10-11 1995-08-24 Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler Expired - Lifetime CA2415685C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/321,338 US5696696A (en) 1994-10-11 1994-10-11 Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler
US08/321,338 1994-10-11
CA002156880A CA2156880C (en) 1994-10-11 1995-08-24 Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002156880A Division CA2156880C (en) 1994-10-11 1995-08-24 Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler

Publications (2)

Publication Number Publication Date
CA2415685A1 true CA2415685A1 (en) 1996-04-12
CA2415685C CA2415685C (en) 2003-12-23

Family

ID=25678122

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002415685A Expired - Lifetime CA2415685C (en) 1994-10-11 1995-08-24 Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler

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CA (1) CA2415685C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007038533A2 (en) * 2005-09-28 2007-04-05 Saudi Arabian Oil Company System to predict corrosion and scaling, program product, and related methods
WO2009020709A3 (en) * 2007-08-03 2010-07-22 General Electric Company Control system for industrial water system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007038533A2 (en) * 2005-09-28 2007-04-05 Saudi Arabian Oil Company System to predict corrosion and scaling, program product, and related methods
WO2007038533A3 (en) * 2005-09-28 2009-06-25 Saudi Arabian Oil Co System to predict corrosion and scaling, program product, and related methods
WO2009020709A3 (en) * 2007-08-03 2010-07-22 General Electric Company Control system for industrial water system

Also Published As

Publication number Publication date
CA2415685C (en) 2003-12-23

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Effective date: 20150824