Chemical Cleaning of Fossil Power Station Steam Generators; Past, Present and Future

Technology for chemical cleaning of steam generators at fossil stations was developed during the latter half of the 20 century. Cleaning solvents and processes were developed for application to conventional boilers. The new fleet of combined cycle generating units with heat recovery steam generators (HRSGs) has raised questions concerning the applicability of technology developed for use in conventional boilers. Chemical cleaning technology is often regarded as mature; there is limited emphasis on research and development. However, there are challenges related to environmental, health and safety concerns, as opposed to technical efficacy. Meeting these challenges will require that new cleaning techniques be technically acceptable and cost effective.