• Toyo Engineering reported 85% ammonia co-firing, measured by heat input, across a naphtha cracking furnace in test operations.
• The trial used newly developed ammonia-fired burners, targeting decarbonization by replacing off-gas methane with a fuel that emits no CO2.
• Hearth burners ran on 100% ammonia, lifting the overall co-firing rate while wall burners continued to use off-gas methane.
• NOx emissions were kept at levels comparable to existing commercial furnaces despite ammonia’s lower burning velocity and fuel-derived NOx risk.
• The partners plan to extend ammonia use to wall burners to move toward 100% ammonia firing across the full furnace.

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