1 Feed system design
The feedheating system associated with a turbine provides the means by which the steam condensed in the main condenser is fed to the boiler. It must also heat the feedwater by use of a series of heat exchangers as demanded by cycle design.
To provide both these services requires a complex arrangement of heat exchangers and pumps, with hundreds of valves interconnected by many kilometres of pipework.
Such a network of valves, pipes and heat exchangers has many possible flow paths. The determination of flow paths and elimination of unwanted routes is critical for the design of a successful system. In this respect, the system design is analogous to electrical circuit design.
The configurations which have been developed over the last fifteen years to meet the functional needs of feed system design in the most cost effective manner are described in this section.