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 PDFInfo
- 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
- Authority
- 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
Links
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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.
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 |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2415685C (en) |
Cited By (2)
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 |
-
1995
- 1995-08-24 CA CA002415685A patent/CA2415685C/en not_active Expired - Lifetime
Cited By (3)
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |
Effective date: 20150824 |