May 2009

Heat Transfer

Rethink planning for heat-recovery systems

Better early design of steam generators can save lots of money in operating cogeneration plants

Ganapathy, V., Consultant

Heat-recovery steam generators (HRSGs) in cogeneration plants differ from those in combined cycle plants in several ways. Steam pressure levels, steam temperatures and reheat parameters for many large steam turbines are standardized. Thus, large combined cycle plants apply steam parameters. Result: HRSG designs are optimized to generate these steam parameters. However, in the case of cogeneration plants, steam pressure, flow and temperature can vary tremendously and there can be a wide range of operating pressure levels. Cogeneration plants have the flexibility to import or export steam to or from the HRSG to be superheated in or outside the HRSG. High-pressure (HP) and low-pressure (LP) s

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