273MW ABB combined cycle power plant

This 273MW combined cycle power plant is completely introduced from ABB Group Switzerland, 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

5. The Overhaul of generating set:

Under the terms of manufacturer- ALSTOM, when use HFO fuel, the overhaul cycle of GT13D3A gas turbine is 16000EOH, GT13DM gas turbine: 24000EOH, steam turbine: 50000EOH.

No.1 gas turbine overhaul

Times Date Starts OH EOH Active power (MWh)

Main renewal components

1 1997.12.11 403 11990 18737 877421 TULA1 and TULE1 are all branded new

2 2001.01.01 585 27861 39562 2094414 TULA1 and TULE1 are renew;

TULA2、3 and TULE2、3 are branded new.

3 2004.02.20 769 45525 55958 3411629

TULA1、4、5 and TULE1、4、5（all renew）；

21pcs of vane of TULE2（all renew）；

VELA1、2、3（all renew）.

According to the operating decision of our power plant, we don’t make the four times overhaul and update to the No.1 gas turbine.

** TULA: means Turbine rotor blade, TULE: means Turbine stator blade; VELA: means compressor rotor blade; VELE: means compressor stator blade.

No.2 gas turbine overhaul

Times Date Starts OH EOH Active power (MWh) Main renewal components

1 1998.01.25 360 12216 18076 906582 TULA1 and TULE1 are all branded new

2 2001.03.01 527 27942 38482 2101047 TULA1 and TULE1 are renew;

TULA2、3 and TULE2、3 are branded new.

3 2003.12.28 684 45176 53623 3374592 TULA1、4、5 and TULE1、4、5（all renew）；

25pcs of vane of TULE2（all renew）；

VELA1、2、3（all renew）.

4 2006.11.07 848 60573 71652 4520472 TULA1、2、3、4、5 including complete of blade carrier, complete of turbine out casing, combustor tile hanging; VELA1—6, VELE1--- 4, these are all branded new

No.2 gas turbine after updating, the increased guaranty load is 6MW, the increased guaranty relative efficiency is2.5%. The overhaul cycle extend to 2400EOH. The actual results are higher than above guaranty data.

Steam turbine overhaul

Times Date Starts OH Active power (MWh) Main renewal components

1 2002.02.09 224 47737 2389413 Four Throttle valve plugs.

6. Combined cycle generating set statues at present:

This CCP 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:

Starts OH EOH Active power (MWh) EOH since last time of overhaul

No.1 gas turbine 1012 67550 82701 4995475 26743

No.2 gas turbine 933 69220 81999 5220679 10347

Steam turbine 412 98269 5215761 50532

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 perfect conditions, the last stage blade haven’t found any water erosion so far.

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