Gas-fired power station
Medway Power Station is a 735 megawatts gas-fired combined cycle gas turbine (CCGT) power station on the Isle of Grain in Kent adjacent to the River Medway, about 44 miles east of London. It started to supply electricity to the national grid in 1995.
Medway Power Limited (MPL) was incorporated in September 1990.[1] It is a joint venture company originally comprising Arlington, Virginia-based AES Corporation (trading as AES Electric) (25%) and the RECs SEEBOARD (37.5%) and Southern Electric (37.5%) (became SSE in 1998).[2] In April 1992 MPL awarded a design, procurement and construction contract to a consortium of Europower Development Ltd and TVB Power Ltd. The contract called for a turnkey 660 MW combined cycle electricity generating plant, deliverable by 1 August 1995.[2]
The station was built by Marubeni (Japanese), Tarmac and Kansas City-based Black & Veatch. The station is run by Scottish & Southern Energy under the name Medway Power Ltd. It was commissioned in 1995, being . In June 2002, American Electric Power (AEP) sold its SEEBOARD company to eDF, giving eDF 37.5% of the power station. SSE bought the plant from AES and eDF Energy for £242m on 3 October 2003. It is near (west of) to the Grain Power Station and next to the Thamesport.
The station is on an 11 acre (4.45 ha) site, above the 200 year flood plain.[2] There is a requirement that the noise at the perimeter must not exceed 65 dBA. The three turbines are contained within an acoustic enclosure in a containment building. The two exhaust stacks are 65 m tall. Stack emissions are limited to 45 ppm NOx. Cooling water is abstracted from the Medway and chlorinated. Water discharges are monitored and treated prior to discharge.[2]
Medway power station is a CCGT-type power station that runs on natural gas. It has two General Electric Frame 9 (9001F) gas turbines.[3] The exhaust gas from these reaches two Nooter Eriksen heat recovery steam generators.[4] The steam from these powers one General Electric steam turbine.
The operating parameters of the main generating plant are as follows.[2]
Medway power station main plant specifications Parameter Value Combustion turbine generators (CGT) Manufacturer General Electric Model MS9001FA Type Advanced Aero Engine Number of 2 Combustion chambers 18 Firing temperature 1,288°C CGT output 228 MW at 11°C CGT heat rate 10,180 kJ/kWh CGT efficiency 35% Steam turbine generator (STG) Manufacturer Nooter/Ericsen Type Natural circulation, triple pressure, reheat type HRSG Number of 2 Exhaust gases Vented to 65 m high steel stacks at 113°C STG output 247 MW STG heat rate 7,934 kJ/kWh STG efficiency 88.7% HP isentropic, 91.8% IP/LP isentropic Net output available 682 MW Net heat rate 6,800 kJ/kWh Net plant efficiency 53% Generators Manufacturer GE Model GE 324S Rating 291 MVA / 15,000 V at 0.85 power factor Type Hydrogen cooled
During a major upgrade project in 2012 the power station benefitted from the GE DLN 2.6 install as well as an upgrade to the excitation and turbine control system. Currently the power station operates as a two-shifting plant with approximately 20MW of black start capacity.
Specification of the ancillary plant is as shown in the table.[2]
Medway power station ancillary plant specifications Parameter Value Step up transformers Rating 290 MVA at 15 kV/420 kV Manufacturer GEC-Alsthom Number 3 Ancillary supply Two 20 MVA transformers for auxiliary services Cooling plant Manufacturer Hamon Type Open wet mechanical cooling tower Construction 12 cell mechanical ventilation Flowrate 612,000 litres per minute Design condition 11°C, 80% humidity Heat rejection 1.614 × 109 kJ/h heat rejection Condenser Manufacturer Senlor Thermal Type Surface condenser Condensing rate 655,000 kg/h using cooling water at 21°C Back pressure main steam 41 mm Hg A on steam turbine at 538°C at 97 barA Back pressure reheat 335°C at 28 barA for hot reheat; 260°C at 6.7 barA Demineraliser Manufacturer Glegg Type Two train two bed Capacity 4,670 l/min (maximum NOx controlwater injection when running on fuel oil)
Feed water deaerator Operating pressure 150 mm Hg A Water storage tank Fuel gas heater Manufacturer Graham/Crane Type Water-to-gas heat exchanger Number 2 Temperature rise 27°C to 150°C Auxiliary cooling Manufacturer Allfa-Laval Type Plate heat exchangers Number 3 Service Cool auxiliary cooling loop; turbine lube oil;Generator coolers
Metallurgy Titanium for saline cooling water Lube oil Reservoir 30,280 l (8,000 gals) Equipment Pumps; filters; heat exchangers Fuel oil Equipment Dual filters; 3 x 50 % pumps; 2 x atomising air compressors Control system Manufacturer Bailey Type Distributed control and information system (DCIS) Facilities Operator interface with turbines; control outputs to generators;Operator control functions; Control of equipment and process parameters
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