Diverter Damper

For a Combined cycle Power Plant, the power island consists of Gas Turbine, Heat Recovery Steam Generator (HRSG) and Steam Turbine. Briefly, Hot flue gas leaving the gas turbine is used to generate steam in the HRSG and this steam is sent to the steam turbine to generate electricity. The hot flue gas leaving the gas turbine can either be released to the atmosphere at simple cycle mode or diverted to HRSG to maintain above explained combined cycle mode operation. Also during start up of the HRSG, the hot flue gas shall be diverted to the HRSG gradually untill the system reaches optimum regime. For this reason, a special equipment called “Diverter Damper” is located between Gas Turbine and HRSG, to allow diversion of the hot flue gas leaving the gas turbine and lead the system to work properly.

Being located at the most important part of the system, the diverter shall resist drag forces, & thermal stresses caused by the hot flue gas, the more diverter can achieve optimum goals, the longer system life can be provided.

ENPRO has designed and manufactured a new Diverter Damper with state of art and being the most successful of its generation.

  • The internally insulated system is designed to withstand drag forces caused by the flue gas at high velocities.
  • The expansion of the internal liners is optimized to have higher product life.
  • The system insulation is provided to have minimum surface temperature to protect the system and working personel at the extreme conditions.
  • The Diverter Damper shaft mechanism is designed to have infinite life.
  • The blade truss system is designed to absorb thermal expansions within the blade to avoid the blade being deformed due to temperature differences within the system hence providing a smooth surface for gas proof operation.
  • The sealing design with seal air system is provided to maintain 100% sealing either in simple cycle or combined cycle mode.
  • The diverter damper is designed to allow the system to operate in  modulating mode which means the damper to be used in cogeneration plants also to allow the system provide desired amount of steam.
  • During the design stage, FEM methods are used in every stage to achieve optimum design characteristics.
  • The system is designed to de assemble into three parts which allows the system to be transported easily and also having no cut in the seal channels etc. in the system that means no weld work at site other than sealing welds.