Description of Two 9E Generator Sets and Their Auxiliary Equipment

Two sets of gas-steam combined cycle power generation units, configured in a 1+1+1 (one-to-one) arrangement, consist of gas turbines, heat recovery boilers, steam turbines, generators, and auxiliary equipment, with an installed capacity of 2*180MW. The gas turbines are the MS9001E model produced by the European SNC branch of the American GE company, with a rated power of 120MW, and can use light diesel, heavy diesel, or natural gas as fuel. The heat recovery boiler is the Q1153/526-173.6(33.3)/5.9(0.67)/500(257) model, a three-pressure, non-auxiliary-fired, forced circulation heat recovery boiler produced by Hangzhou Boiler Group. The steam turbine is the N60-5.6/0.56/527/255 model, a dual-pressure, single-shaft, single-cylinder, impulse, condensing steam turbine generator produced by Harbin Steam Turbine Factory Co., Ltd.

1. Equipment Condition (1) The first gas-steam combined cycle power generation unit (#1 gas turbine, #2 boiler, and #2 steam turbine) was commissioned on November 9, 2004, for commercial operation (using heavy oil), converted to gas in January 2010, completed LNG natural gas power generation in November 2010, and connected to CNOOC's pipeline natural gas in July 2014. The #1 gas turbine has accumulated 36,770 hours of operation (including 17,000 hours of heavy oil operation), with 2,356 ignition starts and 51 trips.

   (Similar detailed descriptions are provided for the second set of gas-steam combined cycle power generation units, #3 gas turbine, #4 boiler, and #4 steam turbine, which was commissioned on December 6, 2004.)

1. In February 2010, the #1 unit underwent its first scheduled major overhaul (in conjunction with the oil-to-gas conversion). The overhaul mainly replaced the turbine's first-stage moving blades (new parts from WOOD), first-stage nozzles, and the first-stage stator vanes of the compressor, as well as the #2 and #3 shaft bearings.

2. In April 2015, the #1 gas turbine underwent a mid-life overhaul, with the DLN upgrade carried out simultaneously. The turbine's first-stage moving blades and the front and rear gas seals of the #2 shaft bearing were replaced.

3. In December 2016, the #1 gas turbine underwent a scheduled major overhaul. The main components replaced included the turbine's second-stage moving blades, third-stage moving blades (new parts from GE), first-stage and second-stage nozzles, first-stage and second-stage return rings, and the second-stage stator vanes of the compressor, as well as the #2 and #3 shaft bearings.

4. In December 2018, the #1 gas turbine underwent a mid-life overhaul. The main components replaced included the front and rear gas seals of the #2 shaft bearing, air intake filter elements and stainless steel support brackets, fuel primary and secondary nozzles, transition pieces, and the top oil pipeline of the #4 shaft bearing; the oil mist separator system was upgraded, and the air intake filter chamber and bends were anti-corrosively treated.

    The #2 steam turbine underwent scheduled major overhauls in 2007 and 2015.

5. The #1 gas turbine generator underwent scheduled major overhauls in January 2007 (GE company stator slot corrugated strip treatment) and April 2015. The #2 generator underwent a scheduled major overhaul in April 2015.

   In January 2010, the company converted from oil to gas, and the #2 boiler underwent a major overhaul. The main work included adding heat-absorbing surfaces to the #2 boiler's condensate water box and removing all the boiler's soot blowing systems.

2. Asset Disposal Interface for Two Sets of Main Equipment Units (1) Two sets of gas turbine units: Complete equipment supplied by GE company (including ELIN generators and MARK-6e control systems), all equipment for DLN upgrades, natural gas filtration modules, secondary water bath heating modules at the machine head, and upgraded equipment. Transformers of model SF10-180000/220 from ABB Transformer Co., Ltd. (2) Two sets of heat recovery boilers: Complete equipment supplied by Hangzhou Boiler Group, including high and low drums and deaerator drums, supporting pump groups, boiler water sampling equipment, flue gas detection equipment, power supply switchgear, and high-pressure feed pump motor frequency conversion equipment. Auxiliary pipelines, fittings, supports, valves, and other components. (3) Two sets of steam turbines: Complete combined cycle dual-pressure condensing steam turbine units supplied by Harbin Steam Turbine Factory, including generators from Jinan Generator Factory, condensers, condensate pumps, auxiliary pipelines, valves, lubricating oil systems, vacuum system equipment, and all supporting auxiliary equipment. Transformers of model SF10-75000/220 from ABB Transformer Co., Ltd. A set of 32T double-beam crane components. (4) Control Systems:

1. The DCS system control system programs and equipment for the steam turbine/boiler are provided by Beijing Bailey Company (ABB)'s infi90, consisting of the first and second combined cycles and the public system, with a ring topology structure.

2. Control components and circuits (electrical, pneumatic, and oil lines) for steam turbine and boiler equipment. (5) Public Systems:

3. A complete set of water treatment equipment (including complete control system equipment, pump groups, and storage tanks, etc.);

4. Equipment within the external circulation pump house (pump groups, rotating filter screens, mobile cleaning machines, 16T single-beam crane components, 32T double-beam crane components, etc.);

5. Compressed air equipment (including air storage tanks, dryers, and compressed air pipelines and pipelines, etc.);

6. DC power supply equipment (including battery packs);

7. Electronic room primary and secondary protection, control, communication, and other equipment;

8. 6KV switchgear equipment;

9. 220KV booster station equipment such as blades, switches, PT/CT, and other station equipment. (6) Inventory of spare parts for the unit, returned materials, tools, and equipment (see list).

The 366MW gas-steam combined cycle power plant

In 2004, two PG 9171E 123.4MW gas turbine generator sets were built, and two sets of waste heat boilers with a capacity of 178 tons / hour and two sets of steam
turbine generator sets with a capacity of 60MW were built, with gas-steam combined cycle power generation up to 123.4+60=183.4MW*2=366.8MW.
In 2014, the low nitrogen combustion system was reformed, and operated normally at full load after adjustment.
The main overhaul items completed in the renovation work are as follows:
1. The fuel nozzle was checked and all the fuel nozzle was replaced.
2. Check the combustion parts such as the joint flame tube, flame tube and transition section, and replace the new joint flame tube, flame tube and guide sleeve
3. All the combustion cylinders were replaced.
4. The five-stage suction pipe of the compressor was reformed
5. Block the flange port of the removed parts on the auxiliary gear box
6. The cooling water pipe of the fire detector was modified
7. Add temperature measurement components to the intake system.

8. The cooling and sealed air system was checked
9. The IGV related gaps and the IGV Angle were checked and measured. The measured angle of IGV was checked with the MARK-VI control panel.
10. Pressure measuring components are installed on the exhaust flue
11. The related defects existing in the operation of the unit were treated.
12. Remove the gas turbine control panel MARK V and replace it with a new MARKVle control tray.

13. All the primary components of the unit were checked
14. Caliated and verified all new pressure transmitters and pressure switches of the unit
15. The combustible gas probe in the unit was calibrand replaced the problematic probe. The unit was successfully ignited in the trial run. Everything is normal during the normal operation of the unit.