| Hydrogen
Aiming for 100% green hydrogen in DeBary 7E peaker
Duke Energy is planning a “first-of-its-kind” project at its DeBary site in Volusia County, Florida, USA. It will demonstrate an “end-to-end system” for production, storage and combustion of 100% green hydrogen in an existing GE 7E gas turbine peaking unit, modified to run on a natural gas/hydrogen blend, up to 100% hydrogen.
The project, a collaboration between Duke Energy, Sargent and Lundy, and GE Vernova, will see the existing 74.5 MW DeBary solar plant provide power for two 1 MW electrolysers. The green hydrogen produced will be delivered to reinforced containers for safe storage. During times when energy demand is highest, the system will deliver the stored green hydrogen to the gas turbine. According to Duke, this will be the USA’s first combustion turbine to operate on such a high percentage of hydrogen. “Hydrogen could play a major role in our
clean energy future,” said Regis Repko, senior vice president of generation and transmission strategy for Duke Energy. In particular it provides power that is dispatchable, a needed element of reliability that enables more intermittent energy sources to be added to the grid, while still ensuring customer demand can be met even during extended periods of high demand.
Using solar energy to generate green hydrogen enables solar plants to be optimised, Duke notes. “Relying on intermittent energy sources without available dispatchable energy sources would put our future electric system at risk of having insufficient energy to serve customer demand.”
Construction of the DeBary demonstration project will begin shortly and Duke Energy anticipates the system will be installed and fully functioning in 2024.
Above: DeBary site (photo: Duke Energy)
GE Vernova says it began working with Duke Energy on a hydrogen plant readiness assessment in 2021. Following installation of the electrolyser equipment and hydrogen storage capacity on site, it will execute modifications to the existing gas turbine infrastructure at DeBary, including the fuel handling systems, valves and piping, making it compatible with higher blends of hydrogen, up to 100% by volume. GE Vernova will also install the fuel skid with hydrogen blending, finalise control modifications, and support overall integration.
Above: End-to-end hydrogen system at DeBary (image: Duke Energy)
When fully operational, the converted 83 MW 7E gas turbine will have the ability to operate on natural gas, liquid fuel, 100% hydrogen, or a blend of natural gas and hydrogen, “providing the site with complete fuel and operating flexibility while maintaining plant reliability.” The 7E gas turbine to be modified for hydrogen is one of four such machines at the DeBary site, just north of Orlando, which also has six GE 7B gas turbines. Total installed gas turbine generating capacity is 692 MW.
Hydrogen ready H-class combined cycle CHP for EnBW
GE Vernova reports the placing of two orders from EnBW for H-Class natural-gas-fired combined cycle CHP plants at Heilbronn and Altbach/Deizisau in Baden-Württemberg. GE Vernova will lead an international consortium implementing the projects, including EPC contractors Bonatti and SENER. The new plants will replace existing coal-fired plants. They will operate initially on natural gas but conversion to 100% hydrogen in the 2030s is envisaged.
The new 680 MW power plants are targeted to begin operation by the end of 2026. Each plant will be equipped with a GE 9HA.01
gas turbine, an STF-D650 steam turbine, a W88 generator, a triple pressure with reheat
heat recovery steam generator and a Mark VIe distributed control system.
Above: Altbach site
Above: Heilbronn site
www.modernpowersystems.com | November/December 2023 | 31
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