Air Cooled Condensers

The Research Cottrell Dry Cooling (RCDC) Air Cooled Condenser (ACC) represents state-of-the-art design and incorporates developments and lessons learned from decades of experience.

The ACC design is optimized for each client to provide a guaranteed maximum efficiency depending on the client’s criteria for balancing capital and operating costs. Each section of the ACC is designed for performance, cost and constructability.

The entire system is guaranteed; RCDC undertakes integral studies related to the steam ducts and manifolds, the steel support structure, condensate piping, and other special studies as appropriate in order to address design issues including cold weather operation, fan stall, noise, wind eff ects, and seismic activity.

Considerations include delivery logistics, construction planning and sequencing, including design details for constructability.

The Process

Process Diagram for Air Cooled Condenser

The RCDC ACC design is based on a single row of condenser tubes over which forced draft air passes to condense turbine exhaust steam. This steam is then conveyed in large steam ducts and manifolds to the overhead steam headers. The fin tubes are arranged into A-frame bundles with forced draft provided by large multiblade fans. Each of these modules is further organized into streets depending on the size of the project.

Condensed steam is collected by gravity into a condensate tank which in turn is located to meet the NPSH requirements of the condensate pumps for return to the steam generator. The effi ciency of the steam condensation process is maintained by using the appropriate vacuum systems to remove non-condensable gases (air) from the system.