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Both turbines were maintained on a six-year component overhaul schedule and were running well when the plant was taken out of service. The units were disassembled with the intent to be reassembled and sold as complete units. All components were visually inspected on disassembly and found to be in good condition, and are securely stored in a dry climate atmosphere. At the time the units were taken out of service, the latest upgrades and maintenance schedules of both units extended the life expectancy an additional 25 years. These units were taken out of service for political reasons and they had just received a complete upgrade 6 months prior to shutdown.
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This GE Steam Turbine Generators 755 MW Cross Compound-turbines Upgraded to 785 MW is no longer needed for company's own operation and is being sold as an asset liquidation for its owner.
Mohave Generating Station consisted of two 755 MW units that have been upgraded to 785 MW, General Electric Cross Compound Turbines. Each unit was provided with steam from its own Combustion Engineering Positive Draft Coal-fired Boiler.
Each unit consisted of High Pressure, Reheat and Low-Pressure turbines. The layout of the turbines were as the following: Steam is supplied to the HP turbine from the superheated section of the boiler through four stop and control valves located approximately 40 feet to the side of the turbine deck. The steam enters the HP turbine first through the stop valves then through the control valves. Each control valve has a separate steam line going to four quadrants of the HP turbine nozzle. The control valves operate independently or in conjunction. Conjunction operation is utilized during start-up to assure all quadrants of the turbine are heated equally and independent operation is utilized after the unit is heated and on line.
HP/ Reheat/ LP Turbine
The HP turbine is a seven-stage design with the steam entering the turbine at 1000ºF at 3500 PSIG. The steam exhausts from the aft end of the turbine and returns to the reheat section of the boiler. The steam is then reheated and returned to the reheat turbine through the combined reheat valves at the same temperature and pressure as the HP turbine. The Combined reheat valves consist of the reheat, stop, and intercept valves located on each side of the reheat turbine. The reheat turbine is a six-stage double flow design with the steam entering the turbine through a double-flow diaphragm located in the center of the turbine. The steam flows forward and aft through the turbine and is exhausted through each end. The exhaust of the reheat turbine is piped via crossover pipes to the inlet of the Low Pressure turbines. The HP and reheat turbines are coupled together and drive a two-pole HP generator at 3600 rpm.
The LP Turbine consists of an “A” and a “B” rotor coupled together and drives four-pole generator at 1800 rpm. The inlet steam arrives from the reheat turbine through the crossover pipes on the forward and aft ends and flows toward the center of the turbine. The LP exhausts through the center of the turbine through the exhaust hood and into the condenser where the water is condensed and recycled through the boiled and turbine system once again. Vacuum for the condenser is provided by a Nash vacuum pump with an Ingersoll Rand backup vacuum pump.
The HP and LP generators are hydrogen-cooled with side mounted hydrogen coolers. Each unit has its own stator, cooling water, and hydrogen seal oil systems. Initially, the excitation for the generators was provided by a rotating excitation unit coupled to the rear of each generator.
However, in the mid-1990s, the rotating excitation was removed and replaced with and upgraded to static excitation for reliability purposes.
Each unit has its own lubrication system of lube oil reservoir, two auxiliary oil pumps, one DC oil pump for emergency use, along with the shaft-driven oil pump located on the front of the HP turbine rotor. While in service, the shaft-driven oil pump provides all of the lubrication and controls oil needs. During start-up, the auxiliary oil pumps provided all oil needs. In the late 1980s, upgrade to the oil system was added in the form of a Full Flow Oil Filtering System for reliability reasons.
Turbine Components Included in Package
*Turbines: The HP, Reheat and LP turbines were disassembled, stored, and prepared for shipping.
All components including outer shells, inner shells, diaphragms, bearings, oil seals, rotors, crossover piping, turning gears, bearing standards, and packaging are included.
All associated bolting including shells, diaphragms, coupling, steam inlet flanges, and standard covers.
*Generators: All generator fields and stators were removed and stored for shipment. All hydrogen seals, oil seals, end bells, inner shields, fan blades, baffles, and other associated bolting was removed, stored, and prepared for shipping.
*Lubrication: The lube oil tanks, pumps, coolers, and filters were removed and stored for shipment.
*Valves: Two sets of internal and bodies of Combined Reheat Valve, stop and control valves will be entirely removed and prepared for shipment.
*Many spare parts are available for these turbines that have been refurbished by GE.?
Please click on the “Turbine Components” Tab for the complete inventory list.
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