Combined Cycle Auxiliary Systems

Learning objectives

  • Describe the function of the Closed Cooling Water System
  • List the typical heat loads cooled by the auxiliary cooling water system
  • Explain the reason for maintaining chemistry control of boiler water
  • Describe the common methods of HRSG chemistry control, including the following:
    • All volatile treatment
    • Phosphate treatment
    • Caustic treatment
  • List the common parameters monitored by the water treatment, sampling, and analysis systems

Course overview

The combined cycle power plant uses a gas turbine and generator to produce electrical power. It uses an HRSG to recover heat from the turbine gas exhaust. This heat is used to produce steam which drives a steam turbine and generator, increasing the plant's electrical output. These major components need many auxiliary systems to function. Understanding the auxiliary systems’ design and operation is important for safe and efficient power plant operation.

Many components throughout a plant need cooling to function properly. Auxiliary systems provide cooling water to many of the heat loads. They are also responsible for making sure the water used during plant operations is clean and treated to reduce plant component corrosion.

The Combined Cycle Auxiliary Systems training course describes the function and operation of the auxiliary components and systems in a typical combined cycle plant. It covers:

  • Closed cooling water system
  • Treatment, sampling, and analysis
  • Chemical addition methods

This course is part of the Combined Cycle Power Plant Operations training series.

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