CA2156880A1 - 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

Info

Publication number
CA2156880A1
CA2156880A1 CA002156880A CA2156880A CA2156880A1 CA 2156880 A1 CA2156880 A1 CA 2156880A1 CA 002156880 A CA002156880 A CA 002156880A CA 2156880 A CA2156880 A CA 2156880A CA 2156880 A1 CA2156880 A1 CA 2156880A1
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
Application number
CA002156880A
Other languages
French (fr)
Other versions
CA2156880C (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
Betz Laboratories Inc
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
Application filed by Betz Laboratories Inc filed Critical Betz Laboratories Inc
Priority to CA002415685A priority Critical patent/CA2415685C/en
Publication of CA2156880A1 publication Critical patent/CA2156880A1/en
Application granted granted Critical
Publication of CA2156880C publication Critical patent/CA2156880C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02—Softening water by precipitation of the hardness
    • C02F5/025—Hot-water softening devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
    • G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means

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.
CA002156880A 1994-10-11 1995-08-24 Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler Expired - Lifetime CA2156880C (en)

Priority Applications (1)

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

Applications Claiming Priority (2)

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

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA002415685A Division CA2415685C (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
CA2156880A1 true CA2156880A1 (en) 1996-04-12
CA2156880C CA2156880C (en) 2003-12-09

Family

ID=23250189

Family Applications (1)

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

Country Status (2)

Country Link
US (1) US5696696A (en)
CA (1) CA2156880C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107601632A (en) * 2017-10-30 2018-01-19 清华大学深圳研究生院 A kind of coagulation Automatic Dosing control method and system
CN113461221A (en) * 2021-07-28 2021-10-01 丰城市天壕新能源有限公司 Intelligent dosing system for dry quenching waste heat power generation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107601632A (en) * 2017-10-30 2018-01-19 清华大学深圳研究生院 A kind of coagulation Automatic Dosing control method and system
CN107601632B (en) * 2017-10-30 2023-06-02 清华大学深圳研究生院 Automatic dosing control method and system for coagulation
CN113461221A (en) * 2021-07-28 2021-10-01 丰城市天壕新能源有限公司 Intelligent dosing system for dry quenching waste heat power generation
CN113461221B (en) * 2021-07-28 2023-06-06 丰城市天壕新能源有限公司 Intelligent dosing system for dry quenching waste heat power generation

Also Published As

Publication number Publication date
CA2156880C (en) 2003-12-09
US5696696A (en) 1997-12-09

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Effective date: 20150824