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PUMPS, VALVES & ACTUATORS PUMPS CONTRIBUTE TO PLANT EFFICIENCY
Sulzer supplies pump technology to Keadby 2 combined cycle gas turbine power plant
advanced gas-fired power plants in the world. Scheduled to commence operation in 2022, the facility will be the first commercial deployment of the 50 Hz version of Siemens’ SGT-9000HL gas turbine. The new plant has been designed to offer efficiency, flexibility, and reliability with Sulzer’s innovative pump technology playing a key role. To achieve its overall efficiency target of
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63%, Keadby 2 is using a 1-on-1 design, with a single gas turbine linked to a single steam turbine. The equipment and all critical ancillary components must be able to offer high efficiency levels across a wide range of loads. When it came to the major pumping applications, the Keadby team turned to Sulzer for advanced technology. The plant will use two of Sulzer’s feedwater
pumps, MD200-400, which have been upgraded in close collaboration with leading gas turbine manufacturers, including Siemens, specifically to meet the requirements of the new generation of H-class turbines. The pumps are set up in a 2x100% configuration, with one duty unit and the other on standby. Patrick Welz, Head of Tendering EMEA for
Sulzer, said: “Thanks to their advanced hydraulic and mechanical design, our pumps will operate at an efficiency of more than 81%, requiring a rated power of only 5.1 MW to achieve suction and discharge flows of 860m3
/h and 730m3 /h respectively at a head
of 2’200m.” One key feature of the Sulzer pump is its
hydraulic thrust balancing system, which includes a balance drum and thrust bearing that have been developed for a long life under extreme operating conditions. Combined with bearings and a lubrication system that have
uilt by SSE in collaboration with Siemens, the 840 MW Keadby 2 power station in Lincolnshire, UK, is one of the most
both been optimised for the application, this greatly improves the ability of the pump to manage overrun situations where it may be required to operate outside its normal performance envelope. The balance drum and bearing arrangement
also help the feedwater pumps to achieve reliability and availability, with a longer service life and less requirement for maintenance than alternative designs. That is an especially
“ The new plant has been
designed to offer efficiency, flexibility and reliability, with Sulzer pump technology playing a key role
The condensate extraction pumps came
from the SJD-CEP series of vertical pumps and offer low net positive suction head (NPSH) as well as high head per stage and good efficiency figures. Specifically designed for this application, the Sulzer pumps offer extended, maintenance-free operation and have been installed in many power generation plants. The cooling water pumps were selected
from Sulzer’s SJT/SJM-CWP range, which as a fabricated pump offers lower weight and higher efficiency compared to equivalent cast iron designs. These pumps can be quickly manufactured to meet the performance requirements of the cooling system and also deliver high efficiency figures and decades of reliable service. CCGT power stations, such as Keadby 2, are
important attribute for the Keadby 2 project, which will feature the first HL-class turbine in Europe to be operated under a 15-year long- term service contract. In addition, Sulzer was also selected to deliver
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condensate extraction pumps and cooling water pumps as part of the same project. Sulzer’s expertise in pump design and its ability to engineer every pump to exactly match the specific application within a short timeframe meant the new pumps could be manufactured and delivered quickly.
used to respond to peaks in demand or fill supply gaps when output from renewable sources is reduced. That requirement leads to significant cycling and the resulting rapid changes in load and temperature present additional challenges for the equipment. With this in mind, the Sulzer design team
paid particular attention to the thermal stability of the MD200-400, with the mass distribution in the suction and discharge casings optimised for thermal behaviour as well as castability. The pump’s stage casing is investment cast for improved thermal performance, and the tensioners that hold the casing together use a Sulzer patented design that provides additional security under cyclic operating conditions. Welz concluded: “In addition to the main
feedwater pumps, Sulzer has also supplied several other large pumps to the Keadby 2 project. They include a pair of SJD-CEP pumps for condensate extraction and two SJT/SJM- CWP cooling water pumps, all of which use our state-of-the-art designs, offering high efficiency across their full operating range. Together, Sulzer has made a very significant contribution to the overall efficiency of the new power station.”
Sulzer
www.sulzer.com
22 MAY 2022 | PROCESS & CONTROL
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