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03583 CHEMICAL CLEANING OF UTILITY ONCE-THROUGH GENERATING UNITS THAT HAVE BEEN ON LONG TERM OXYGENATED TREATMENT (OT)

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Product Number: 51300-03583-SG
ISBN: 03583 2003 CP
Author: J.M. Sullivan, J. W. Horvath
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Two case studies are presented that review the design, execution, and results of chemical cleaning on utility once-through generating units. OT was first introduced into the U.S. in 1991. The OT application was successfully demonstrated on a number of utility once-through generating units. Many in the utility industry quickly made the transition from all-volatile treatment (AVT) to OT based on these successful applications. Prior to OT, once-through generating units were chemical cleaned on a preventive maintenance basis (which ranged from 18-36 months). With the advent of OT in the United States, it was touted in the utility industry that chemical cleaning would no longer be required on once-through generating units. Operator experience has shown that chemical cleaning of once-through generating units cannot be avoided but that the frequency rate can be extended out to beyond 8 years. Keywords" All-Volatile Treatment (AVT), Oxygen Treatment (OT), Hydroxyacetic/Formic Acid (HAF), Ammonium Bifluoride (ABF), Diammonium EDTA, Corrosion Inhibitor
Two case studies are presented that review the design, execution, and results of chemical cleaning on utility once-through generating units. OT was first introduced into the U.S. in 1991. The OT application was successfully demonstrated on a number of utility once-through generating units. Many in the utility industry quickly made the transition from all-volatile treatment (AVT) to OT based on these successful applications. Prior to OT, once-through generating units were chemical cleaned on a preventive maintenance basis (which ranged from 18-36 months). With the advent of OT in the United States, it was touted in the utility industry that chemical cleaning would no longer be required on once-through generating units. Operator experience has shown that chemical cleaning of once-through generating units cannot be avoided but that the frequency rate can be extended out to beyond 8 years. Keywords" All-Volatile Treatment (AVT), Oxygen Treatment (OT), Hydroxyacetic/Formic Acid (HAF), Ammonium Bifluoride (ABF), Diammonium EDTA, Corrosion Inhibitor
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The approach to the commissioning of a heat-recovery steam generator in the industry has varied from project to project. One school of thought contends that no chemical cleaning (or minimal) is required. The second school of thought contends that a complete chemical cleaning is required. This report discusses these differences, and a properly designed and well executed cleaning with desired results.
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