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DOE work leads to superalloys that stand up to power plant cycling

DOE work leads to superalloys that stand up to power plant cycling

MHPS boiler A six-year project backed by the U.S. Department of Energy and involving Energy Industries of Ohio Inc. and other partners has led to…

Wednesday, Mar 23

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MHPS boiler A six-year project backed by the U.S. Department of Energy and involving Energy Industries of Ohio Inc. and other partners has led to the manufacture of commercial-scale nickel superalloy components that are needed to enable higher-efficiency thermal power plants.

The Advanced Ultra-Supercritical (AUSC) Component Testing (ComTest) Project aimed to fabricate full commercial-scale components to enable plants to operate with greater efficiency and at conditions of up to 1,400 degrees Fahrenheit and steam or supercritical carbon dioxide pressures of at least 3,500 pounds per square inch. At higher efficiency levels, fossil-fueled power plants generate electricity using less fuel and produce fewer emissions.

The $27.7 million project included $20 million in DOE funding led by the National Energy Technology Laboratory . The most recent phase focused on developing a U.S. supply chain of commercial AUSC components made of nickel-based alloys.

Nickel superalloy ingot producers, foundries, forging, pipe extrusion and bending fabricators and research centers in 15 states participated in the project. The aim was to design and build AUSC components from nickel superalloys and other advanced alloys for reliable operation under both steady-state and varying-load operating conditions.

To make room for greater amounts of wind and solar power on the electric grid, conventional generating units must ramp down and ramp up or stop and start electricity-generating operations more frequently. During cycling , boiler tubes, superheaters and other plant components undergo large temperature and pressure stresses. The AUSC components developed through ComTest are expected to withstand cycling for operating lifespans of least 30 years.

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