Water Chemistry and Corrosion of Power Plants and Allied Industries Reduce hydrogen damage, reduce boiler tube failure, and improve unit reliability.
Minimize corrosion deposition. Learn the proper response when chemical limits are exceeded. Understand the consequences of operation while boiler and feed water chemistry limits are being exceeded, proper laboratory QA/QC water (and fuel) testing methods, and how to calculate safe contaminant levels in boiler and feedwater.
This TECHNICAL WORKSHOP is designed for power plant laboratory technicians and supervisors. The Seminar provides an understanding of the role of chemistry in a power plant, the effects of chemical excursions, and how to determine chemical limits. It also provides a discussion of testing methods, the need for a quality assurance/quality control program, and how to set up a QA/ QC program.
Describe various chemical treatment programs
Determine chemical limits for a unit.
Respond properly to chemical excursions
Describe proper sampling and analysis methods
Discuss the components of a QA/QC program
Describe the mechanisms for various types of corrosion and how this corrosion is controlled.
Minimize operational risk with an onsite chemist
Understand Water Chemistry for Power Plants,
Understand Corrosion chemistry for Power Plants,
Understand Water Chemistry for Allied Industries,
- Understand Corrosion Chemistry for Allied Industries
Power plant chemists are responsible for minimizing corrosion- and deposition-related failures in combined-cycle facilities. Their demonstrated the positive impact on operations contributes significantly to plant efforts aimed at achieving top performance—a fact that often is not fully appreciated by station management.
The “unseen” nature of cycle chemistry work is one reason. Mechanical and electrical issues, by contrast, are quite visible, often causing equipment to fail and, on occasion, plants to shut down. The consequences of poor plant chemistry and chemistry control may not surface for years because of the delayed-development characteristic of the issues. Examples: Heat-recovery steam generator (HRSG) and steam-turbine damage mechanisms, such as under-deposit corrosion and stress corrosion cracking, respectively, can result in failures months or years after the initiating chemistry event or events.
Traditionally, combined-cycle plants have had small staffs because of their relatively high degree of automation and aggressive pro
formats. Many of these plants have no chemist, or only a part-time position, or third-party management of cycle-chemistry functions. Each of these circumstances presents a degree of risk to long-term reliability.
Often the chemist’s role, as viewed by plant operations and engineering personnel, is to collect samples and adjust chemical analyzers at the wet rack—and very little else. This is a gross understatement. The chemist’s role is complex and multi-faceted, and when carried out correctly, contributes to improved plant reliability.
Another common misconception about the chemist’s role in a combined-cycle plant is that it’s an “easier job” than at a coal-fired steam station because there are no coal/ash chemistry issues to deal with. However, combined-cycle chemistry is at least as complex, if not more so, than that for a coal plant. Reasons include multiple boiler pressure stages, blended flows, mixed chemistry programs, etc. Plus, combined cycles are much more difficult to inspect and repair than a conventional steam unit.
Staffing levels are another consideration. A typical coal plant generally has four to five times the personnel assigned to a combined cycle of equivalent output. This means the combined-cycle chemist is sure to be assigned several part-time roles as well—such as health and safety, environmental compliance, etc—which impact the time available for core/strategic chemistry functions.
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