Mitsui Chemicals achieves 85% ammonia co-firing in naphtha cracking furnace test, keeps NOx in line with existing units

• Mitsui Chemicals hit 85% ammonia co-firing, by heat input, across a naphtha cracking test furnace under a NEDO-backed decarbonization project.
• Hearth burners ran on 100% ammonia while wall burners stayed on off-gas methane, supporting stable operation in the trial setup.
• NOx emissions matched levels seen in existing commercial furnaces, addressing a key barrier to ammonia combustion in crackers.
• The partners are targeting 100% ammonia firing across the full furnace, extending ammonia use to wall burners.

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