Co-firing hydrogen with natural gas for 9 MW Siemens Energy dry low emissions combustor: Part I - high pressure rig test

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Burner metal temperatures and NOx emissions rise as H2 concentration increases, indicating operational limits.
Testing confirmed that the combustor can operate safely with 40% H2, with comparable wall temperatures to natural gas.
Optimal operation requires adjustments in pilot split and turndown control based on fuel composition for efficiency.
Combustion dynamics remained stable for H2 blends up to 40%, indicating robust performance in diverse conditions.

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High-pressure tests show that blends of up to 40% H2 maintain combustor performance, suggesting improved emissions control.

Liu et al. (2025) studied this question.

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