About 273MW ABB combined cycle power plant

This 273MW combined cycle power plant is completely introduced from ABB Group Switzerland. Company and manufactured by America GE Company. It was commercially run in 1993 year. It is composed of two (2) GT13D3A gas turbines and one (1) DK1-1N31 steam turbine.
The operating conditions and main technical data are as follows:

1.Operating conditions:

Atmospheric Temperature:             25℃
Atmospheric Pressure:                   1010mbar
Humidity:                                            80%
Fuel:                                                    180cst HFO

2.Gas turbine data:

Model:                                                  GT13D3A
Compression Grade:                        18
Turbine Grade:                                   5
Pressure Ratio:                                  12.4
Air Flow:                                               317kg/s
Turbine Inlet Temperature:               990℃
Turbine Exhaust Temperature:        500℃
Combustor:                                         Single-cylinder, Single injector                

3.Operating data (Standard Status and Basic Load)

Output power of each turbine:                                     92MW
Total output power by combined cycle:                    273MW
Unicycle Fuel consumption:                                      296g/kWh
Unicycle Heat efficiency:                                            29.8%
Combined cycle Fuel consumption:                       204g/kWh
Combined cycle Heat efficiency:                              43%
Combined cycle Total Heat consumption:             8376KJ/kWh

4.Steam turbine main data:

Model:                          DK1—1N31 Single-cylinder, Straight condensing, Reaction turbine
Grade Number:                                    26
Inlet Steam Pressure:                        36bar
Inlet Steam Temperature:                 473℃
Exhaust Steam Pressure:                 0.065bar
Rated Power:                                       87MW

Combined cycle generating set statues at present:

This CCPG was commercially run in 1994. Until 31th August of 2008, main operating data of the two gas turbines and one steam turbine are as follows:

No.1 gas turbine has run 26743EOH since the third time overhaul in February of 2004 to 31th August of 2008, it was working 10743EOH over overhaul cycle. Through strengthening A check and extraordinary inspection to find and process the trouble and flaw; To be safe we low the turbine inlet temperature from 990℃ to 980℃, at the same time minimize the running time. It is only used during the NO.2 gas turbine cleaning after one overhaul cycle. So far, each system and component is in normal condition and statues.

No.2 gas turbine after the fourth overhaul and updating in beginning of 2007, each component is in good and perfect conditions except a little corrosion in TULE1.After updating, NO.2 gas turbine increase its output power and low its fuel consumption.

The steam turbine is in good and perfect conditions, the last stage blade haven’t found any water erosion so far.