ALSTOM launches next generation HRSG

03/01/2012

ALSTOM announces the launch of the next generation Heat Recovery Steam Generator (HRSG), a marriage of the OCCTM design with Once-Through evaporator technology developed by Siemens.  With this development, ALSTOM can continue to provide the most technologically advanced HRSGs with high efficiency, superior performance in high-cycling applications, and ease of field erection at a competitive price.

With over 30 Once-Through HRSGs in service, ALSTOM is already the world leader in providing Once-Through HRSGs for large, advanced gas turbines in combined cycle applications.  Now ALSTOM can offer Once-Through HRSGs with all of the features of the OCCTM design for optimized cycling and constructability.

The key advantage of a Once-Through evaporator on an HRSG is the elimination of the thermally sluggish, high-pressure steam drum.  The Siemens technology, developed at the Cottam Development Centre in the U.K., uses a horizontal gas flow, vertical tube arrangement for the evaporator.  In addition to the elimination of the steam drum, this design provides improved cost effectiveness and the ability to provide a Once-Through HRSG in standardised heat exchange modules that integrate perfectly with ALSTOM’s proven OCCTM design concept.

The OCCTM design has the following features for reducing thermal stresses during cyclic operations:

  • Single row of tubes between headers
  • Finned tubes with no bends
  • Flexible connections between pressure part sections
  • Elimination of division walls inside headers
  • High creep strength materials in high temperature areas
  • Small diameter headers
  • Multiple header connections to promote uniform flow and metal temperatures in superheater and reheater sections
  • Enhanced drain arrangement to prevent condensate flooding of superheat and reheat sections during gas turbine purge

In addition, the Once-Through OCCTM design can be packaged and delivered in the following modularity options:

  • Harp bundles – where transportation is restricted, large cranes are scarce and site labor is inexpensive
  • Pressure part modules – where transportation is less restricted and large cranes are available
  • C-Frame Modules (pressure parts integrated with support steel and casing) - where transportation is unrestricted, large cranes are available and site labor is expensive.

ALSTOM announces the launch of the next generation Heat Recovery Steam Generator (HRSG), a marriage of the OCCTM design with Once-Through evaporator technology developed by Siemens.  With this development, ALSTOM can continue to provide the most technologically advanced HRSGs with high efficiency, superior performance in high-cycling applications, and ease of field erection at a competitive price.

With over 30 Once-Through HRSGs in service, ALSTOM is already the world leader in providing Once-Through HRSGs for large, advanced gas turbines in combined cycle applications.  Now ALSTOM can offer Once-Through HRSGs with all of the features of the OCCTM design for optimized cycling and constructability.

The key advantage of a Once-Through evaporator on an HRSG is the elimination of the thermally sluggish, high-pressure steam drum.  The Siemens technology, developed at the Cottam Development Centre in the U.K., uses a horizontal gas flow, vertical tube arrangement for the evaporator.  In addition to the elimination of the steam drum, this design provides improved cost effectiveness and the ability to provide a Once-Through HRSG in standardised heat exchange modules that integrate perfectly with ALSTOM’s proven OCCTM design concept.

The OCCTM design has the following features for reducing thermal stresses during cyclic operations:
 

  • Single row of tubes between headers
  • Finned tubes with no bends
  • Flexible connections between pressure part sections
  • Elimination of division walls inside headers
  • High creep strength materials in high temperature areas
  • Small diameter headers
  • Multiple header connections to promote uniform flow and metal temperatures in superheater and reheater sections
  • Enhanced drain arrangement to prevent condensate flooding of superheat and reheat sections during gas turbine purge
     

In addition, the Once-Through OCCTM design can be packaged and delivered in the following modularity options:
 

  • Harp bundles – where transportation is restricted, large cranes are scarce and site labor is inexpensive
  • Pressure part modules – where transportation is less restricted and large cranes are available
  • C-Frame Modules (pressure parts integrated with support steel and casing) - where transportation is unrestricted, large cranes are available and site labor is expensive.

 

Press Enquiries :
Paola TIZIONI
Tel. : +33 (0) 134 65 42 05
Fax. : +33 (0) 134 65 47 49
paola.tizioni@chq.alstom.com
Project Enquiries :
Kelly Bradford
Tel. : +61 2 8870 6101
Fax. : +61 2 8870 6005
Kelly.bradford@power.alstom.com