Turbine developments |
Aeroderivatives on wheels enable diesel-to-gas switching in Oman
GE Gas Power has signed an agreement to build, own and operate a new “power plant on wheels” equipped with four mobile TM2500 aeroderivative gas turbines for the Centralized Utilities Company (“Marafiq”) in Oman. Rural Areas Electricity Company SAOC (“Tanweer”) will purchase from Marafiq the power generated at the new plant, which is located in the Special Economic Zone at Duqm, under a power purchase agreement between Tanweer (an Oman government owned company mandated to provide power in various regions of the country) and Marafiq. The four TM2500 units (the TM denoting ‘trailer mounted’) will replace power currently generated by diesel generators.
GE’s TM2500 “power plant on wheels”
They will provide up to 80 MW of power, with commissioning in as little as five months’ time. The facility will then be operated for a minimum of three years, until the area is connected to the main 400 kV grid.
Air Products and Baker Hughes team up on H2
Air Products and Baker Hughes have announced a “strategic global collaboration” to develop next “generation hydrogen compression to lower the cost of production and accelerate the adoption of hydrogen as a zero-carbon fuel.” As part of the collaboration, Baker Hughes will provide Air Products with advanced hydrogen compression and gas turbine technology for global projects, including NovaLT16 turbines for Air Products’ net-zero hydrogen energy complex in Edmonton, Alberta, Canada and advanced compression technology for the NEOM carbon-free hydrogen project in Saudi Arabia. Baker Hughes says it developed its first hydrogen compressor in 1962 and today has more than 2000 units operating around the globe and its “hydrogen portfolio also includes gas turbines that can burn methane gas and hydrogen blends from as little as 5% to as much as 100% hydrogen.”
The TM2500 gas turbines offer significant flexibility in terms of fuel source and also operationally, able to start up five minutes and to ramp up at 20 MW per minute.
GE and IHI to develop ammonia roadmap
GE and IHI have signed an MoU with aim of developing a roadmap to support the use of ammonia in both existing and new gas turbines, with a focus on the feasibility of using ammonia as feedstock for gas turbine power plant installations in Japan and across Asia.
When used as a carrier for hydrogen, ammonia promises “lower-cost transport and storage of a carbon-free fuel which can be used directly in natural gas power generation”, the companies say.
“GE is continuing to advance our gas power technologies towards near zero-carbon power generation and part of this evolution may involve the use of ammonia as a fuel in order to reduce CO2
emissions,” said Ramesh Singaram, president and CEO for GE Gas Power in Asia.
IHI describes itself as a leader in the co-firing of ammonia in gas turbines, having operated a machine on 70% liquid ammonia. “GE and IHI have a strong relationship through the gas turbine and aero engine business,” said Koji Takeda, president of resources, energy & environment business area, IHI. “Our combined strengths will empower us to explore the potential of ammonia-fired gas turbines to contribute to the Japanese government’s target of becoming carbon neutral by the year 2050.”
Feedwater pump for advanced H class
The 840 MWe Keadby 2 combined cycle plant currently under construction in the UK will be the first 50 Hz application of Siemens HL gas turbine technology, it will also be the first application of new feedwater pump technology developed by Sulzer to match the requirements of combined cycle plants
Sulzer MD feedwater pump (without insulation)
employing new generation H class gas turbines. The Sulzer “first-in-class” MD feedwater pump, as well as being sized to deal with the sheer scale of advanced H class gas turbine technology is also designed to be highly flexible in operation and capable of dealing with varying demand. Many gas turbine based power plants no longer run continuously, they are brought online as and when demand requires. This can mean several stop-start cycles every day, which can introduce new challenges for all of the equipment in the power plant. During the design phase of H-class technology gas turbine manufacturers took the opportunity to work with pump manufacturers such as Sulzer on developing optimized pumps in tandem with the work on the turbines. In this way, when the new H-class turbine was ready to be launched,
28 | July/August 2021 |
www.modernpowersystems.com
there was also a complete suite of pumps and other equipment that matched the performance demands and could be installed as a complete power generation solution.
Among design features of the new Sulzer feedwater pump is the hydraulic thrust balancing system, which includes a balance drum and thrust bearing that have been developed for long life under extreme operating conditions. The bearings as well as the lubrication system are also optimized for the HL class application and the complete system is unaffected by rapid temperature variations associated with frequent start-stop operations. In a 1-on-1 configuration, as at Keadby 2, there are two typically two feedwater pumps, operating in a duty/standby arrangement. Patrick Welz, head of tendering, EMEA, Sulzer
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