GE Vernova announced the completion of the validation test campaign for its Dry Low NOx (DLN) hydrogen combustion technology for B- and E-class gas turbines.
The test campaign, conducted at GE Vernova’s Global Technology Center in Greenville, South Carolina, demonstrated successful operation on natural gas and hydrogen blends and on 100% hydrogen with dry emissions below 25ppm NOx, the company said. GE Vernova currently plans to make the new DLN system available for new and existing B- and E- gas turbines as early as 2026.
“Developing a DLN combustion system able to burn 100% hydrogen safely and reliably is an engineering challenge,” said Jeremee Wetherby, Carbon Solutions leader, GE Vernova. “One of the ways hydrogen fuel differs from natural gas is that it burns much faster. Its flame speed is roughly eight times higher and presents risk of flashback. Through the test campaign, the GE Vernova team demonstrated very robust operation for the new DLN technology, without flash- back across a range of loads and fuel from pure natural gas to 100% hydrogen.”
While combustion dynamics or noise can be challenging with hydrogen operation, GE Vernova said the prototype performed “very well” in that category with relatively low levels, even when operating on pure hydrogen. The company added that test results seem to indicate that the technology can deliver higher availability and longer maintenance intervals comparable to current DLN combustors operating on natural gas.
A new micromixer-based fuel air pre-mixer is foundational to the prototype combustor capability. GE Vernova’s research on micromixer technology started in 2005 as part of collaboration with the US Department of Energy. Micromixer-based fuel premixers have been part of the product portfolio for over 7 years, notably on GE Vernova’s H Class gas turbine fleet. Recent research conducted at GE Vernova’s Advanced Research Center in NY and at the Global Technology Center in Greenville, SC focused on improving micromixer and axial fuel staging for hydrogen capability. This research culminated with the construction of a full size 6B DLN combustor prototype and testing in full scale conditions (pressure, flow, temperature) in the combustion test facility in Greenville, SC.
GE Vernova’s industrial gas turbines (B- and E-Class) have an installed base of approximately 2,800 units around the world powering industrial processes and operations around the clock. Hydrogen combustor options already exist today with ratings up to 100% hydrogen, however existing combustors use a diluent like water to manage emissions. GE Vernova argues the new H2 DLN combustor technology is expected to present several benefits versus the existing systems:
“Through successful tests GE Vernova validated this new 100% hydrogen capable combustion technology, aiming to provide our B- and E-class industrial gas turbines owners with the maximum flexible operability range on natural gas, hydrogen or blends of both without the use of diluent like water for emissions abatement,” said Wetherby.