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Siemens, 701 DU, Gas Turbine Generator Sets, 125 MW, 50Hz

Siemens, 701 DU, Gas Turbine Generator Sets, 125 MW, 50Hz

Description

  1. Overview
    1. Siemens 701 DU gas turbine generator sets.
    2. 50 Hz.
    3. 125 MW x 2 sets.
    4. ABB generators.
    5. Dual fuel.
    6. Can be operated on HFO.
    7. Warranty and BOP can be offered separately.
    8. Transformers are not available.
    9. These 2 units were zero hour rebuilt by Siemens Turbocare and re-plated as Siemens 701 units.
    10. They were put into storage and never used following rebuilt.
    11. The units were made natural gas only to comply with European emission requirements.
    12. They can be converted to diesel but at additional cost for nozzles, etc. and labor.
    13. These are also one of the few turbines this size that can operate on HFO.
    14. Although these turbines have never been run, their warranty has since lapsed on the basis of elapsed time.
    15. Reinstating that warranty is possible, provided the turbines first enter a workshop for inspection and refurbishment.
  2. Equipment Scope Document
    1. Two (2) Siemens Westinghouse W701DS gas turbine generator sets.
    2. Introduction: There are two (2) Siemens Westinghouse W701 DS gas turbine generator sets for sale: the upgraded version of W501D models, which were manufactured by Fiat who designed them as TG50D5 under licence to Westinghouse (presently a Siemens company).
    3. Brief history: The W501D models of gas turbines were owned, installed and operated by an Italian utility company for three (3) years before they were dismantled as a result of the company’s decision to increase the plant capacity.
    4. At which point, the two (2) W501D units were sold to the present owner who had them upgraded by Siemens to W701DS models with 127.8 MW nominal capacity each.
    5. Siemens also fully overhauled the units to zero hours.
    6. These units are now for sale.
    7. The 701DS technology is one of the most widespread middle size engines (100-140MW) for power generation that can also operate on heavy fuel oil (HFO).
  3. Equipment Technical Presentation
    1. The nominal net site output of each unit is 127.8 MW at ISO conditions, with 32% efficiency in open cycle and up to 52% efficiency in combined cycle.
    2. The turbines have dual fuel capability on natural gas and distillate oil (also heavy fuel oil, following pre-treatment) and are equipped with hot stacks (by-pass) when used for simple cycle operation.
    3. Each unit is located in a separate enclosure and is equipped with its own inlet filtration system, anti-icing system and water injection for NOx abatement.
    4. We can provide an optional plant insurance and warranty period through an operation and maintenance contract, which will not exceed the calendar date in which one of the following events will first occur: 8,000 equivalent hours; 12 months from the GT first firing.
    5. Turbocare SPA was contracted to conduct a major overhaul of both generator assemblies including stator and rotor overhauls.
    6. Turbocare SPA also upgraded both gas turbine longitudinal sections to 127.8MW, 50Hz according to the OEM technical specification.
    7. The overhaul and upgrade results as well as the aftermath performance test results are available upon request subject to purchase.
    8. The standard overhaul warranty provided by Turbocare SPA at ISO conditions is: net power output of 127,800 kW; heat rate of 2,664 kcal/kWh.
    9. The upgrading warranty provided by Turbocare SPA at ISO conditions guarantees: power increase of 4.2% from original ISO output; heat rate improvement of 0.6% from original ISO output; exhaust temperature increase of 12°C from original ISO output.
    10. All figures make reference to ISO conditions, base load, dry natural gas, open cycle and with GT auxiliaries only.
    11. The gas turbines were inspected by two independent verification authorities.
    12. Inspection reports, as well as maintenance history, performance upgrade results and supported warranties can be made available upon request.
  4. Potential Use of 701DS Technology
    1. The 701DS technology is one of the most widespread middle size engines (100-140MW) for power generation and the only engine of its size that can operate on heavy fuel oil (HFO).
    2. These gas turbines are designed for dual fuel use with capability of switching between natural gas and HFO while still operating under load.
    3. HFO is often used as a backup fuel for peaking power plants or when natural gas supply is interruptible.
    4. This flexibility to switch fuels is very important advantage of 701DS’s.
    5. In respect to fuel type, within reason any and all heavier grades of fuel can be used as these are old design slow speed marine diesels that are not sensitive to fuel quality issues.
    6. The application of 701DS in power industry will give the producers an advantage of economic flexibility switching to fuel oil when natural gas prices become expensive.
  5. Possible Configurations of 701's
    1. In simple cycle, the 701DS is a reliable machine with 127,800 kW net power output ISO conditions and 32% efficiency, which can serve as low cost machine for peaking services.
    2. While in combined cycle it gives excellent fuel savings with 52% efficiency in base load operations.
    3. The gas turbines are suitable for including in 400 MW power plant comprising of: two (2) Siemens Westinghouse 701DS gas turbines, a 140 MW steam turbine, two (2) HRSGs.
    4. (2) HRSGs can be designed, installed and commissioned within 20-24 months from contract signing.
    5. A typical 400 MW combined cycle is described in the following diagram.
  6. List of Installations of W701DS's
    1. Eight (8) W701DS's have been installed in Syria (Nasserieh and Zayzoon) and equipped for residual oil (RO) operation.
    2. The units run in simple cycle mode.
    3. There is no drawback for the gas turbine to run in combined cycle with RO as compared with simple cycle.
    4. The matter must be addressed in the design of the boiler and of the thermal cycle, depending on RO chemistry.
    5. Also, a fuel oil treatment plant should be designed to treat the residual oil before feeding to gas turbines.
    6. Two (2) W701DS's have been installed in Iraq and equipped for HFO operation when natural gas is not available.
    7. These units have been installed and currently operate absolutely remotely from Fiat Avio offices located in Turin, Italy using the Siemens state of the art remote control system.
  7. Scope of Supply
    1. The two (2) GTG sets are a nominal 127.8MW machines each including the following scope of supply:
    2. Gas turbine W701DS: GT engine; dual fuel std combustion system; turbine bearing fire fighting; on board I & C devices; on board air cooling system; on board bypass system.
    3. Generator: hydrogen cooled generator (excitation system included); rotor jacking oil system; hydrogen oil sealing system.
    4. Control package: vibration motion system (Bently Nevada); gas detection system (MSA); fire protection board (Ciodue).
    5. Electrical package: motor control centre; 6kV board; generator protective relay panel; battery charge with batteries and inverter; auxiliary transformer; insulated bus bar duct; generator circuit breaker; excitation board; excitation transformer; lighting board; starting system board and transformer (2 packages for 4 power islands).
    6. Starting package: static frequency converter (1 package for 2 power islands); SSS clutch (SSS); barring gear.
    7. Inlet air system: filter room; inlet manifold; inlet silencer.
    8. Exhaust system: horizontal diffuser; silencer; vertical stack; diverter box.
    9. Mechanical package: common lube oil system for the gas turbine and generator; atomizing and instrumental air system; cooling air system; gas fuel system skid; liquid fuel system skid; cooling water skid; water injection skid; liquid fuel forwarding skid.
    10. Cooler assemblies: air-to-air cooler for rotor cooling; oil-to-water cooler for lube oil cooling; water-to-air cooler for water cooling system.
    11. Fire fighting system (CO2 deluge): GT enclosure; turbine bearing; mechanical package enclosure.
    12. Enclosures with ventilation and lighting system: gas turbine module; generator (only a shed); mechanical package; electrical package; control room; battery and DC distribution room.
    13. Other: emergency diesel generator with relevant board (1 unit for 2 power islands); GT pipe rack assemblies.
    14. Documentation: layouts, P&I drawings, single line diagram (as available on site); O&M manuals (as available on site).
  8. Terminal Points
    1. The used gas turbine package is delimited by the following boundaries:
    2. Natural gas: at inlet flange of the gas skid in the mechanical packages.
    3. Diesel fuel oil: at inlet flange of the GT injection skid.
    4. 15 kV: insulated bus bar duct terminals.
    5. I&C interconnection: at marshalling box at the supplied equipment.
    6. Other utilities (water, etc.): at inlet flange at the supplied equipment.
    7. Pipe rack: at boundary of the power island.
  9. Exclusions
    1. The following equipment, systems and connections, necessary in order to operate the power plant, are excluded in the current scope of supply:
    2. Generator step up transformers.
    3. Consideration by purchaser to replace existing filter rooms with new pulse cleaning type filters if in desert area.
    4. Pipes with diameters ≤2".
    5. Cables, conduits and cableways.
    6. Control systems.
    7. Battery.
    8. Pipework insulation.
    9. Valves, fittings, pipes, cables, structures and any other material of any kind outside terminal points.
    10. Communication systems.
    11. Fire-fighting system(s) apart GT bearing, GT and mechanical enclosures.
    12. Gas reducing/compression station.
    13. Tank and tank farm.
    14. Fuel oil transfer from tank to forwarding skid.
    15. Fuel oil treatment system.
    16. Fuel oil unloading bay system.
    17. Electrical substation.
    18. Ancillary buildings (e.g. warehouse, workshop etc.) with relevant equipment.
    19. Lighting system outside the existing GT power island boundary.
    20. Lightning system.
    21. Embedded systems and materials (e.g. oily and rainy water; raw, portable and demi water; sewage; cathodic protection; earthing grind etc.).
    22. Water-treatment plants (e.g. raw, potable, oily, demi etc.).
    23. Hydrogen storage and/or production system.
    24. DCS for power plant control.
    25. Power plant electrical system supply.
    26. Black start system if required.
    27. HV and I&C interconnection to HV substation.
    28. Any kind of modification request to comply with new site design conditions, norms, codes, local laws etc.