The benefits of the vertical HRSG for repowering projects – where sites are typically congested and space is short – are well illustrated at the GDF-Suez-Electrabel Dunamenti complex in Hungary.
This 1790 MWe plant, located on the Danube, about 30 km south of Budapest, dates back to the early sixties and encompasses a variety of generating plant:
241 MW CCGT (the result of a 1995-97 repowering project); 145 MW cogen; 60 MW condensing steam turbine; and six 215 MW gas fired condensing units (converted from HFO), designated F8-13.
A new, 200 million euro, repowering project is now underway that will see the addition of an Ansaldo-supplied Siemens-licensed V94.3A gas turbine generator exhausting into a vertical 3-pressure-level-plus-reheat HRSG, with 80 m stack. The HRSG is being provided by CMI (who also supplied the HRSG for the earlier repowering ten years ago). The HRSG, which will be of the outdoor type, without external building, will provide steam to the turbine of unit F9, to be refurbished by Alstom. The existing condenser and generator will also be renovated. The result will be a modern and efficient 400 MW combined cycle plant, adding a net 185 MW to the installed capacity at the site.
The repowering contract was signed in February last year and the notice to proceed issued in September. An option is included for unit F9 to be repowered in an essentially identical project to be carried out following completion of the F8 repowering project