Performances and emission characteristics of NH3-air and NH3-CH4-air combustion gas-turbine power generations

Osamu Kurata, Norihiko Iki, Takayuki Matsunuma, Takahiro Inoue, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Akihiro Hayakawa

Research output: Contribution to journalArticlepeer-review

320 Citations (Scopus)


For the first time NH3-air combustion power generation has been successfully realized using a 50-kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology Japan. The combustor adopted gaseous NH3 fuel and diffusion combustion to enhance flame stability. The emission of NO and unburnt NH3 depends on the combustor inlet temperature. Emission data revealed the existence of NH3 fuel-rich and fuel-lean regions in the primary combustion zone. It is presumed that unburnt NH3 is released from the fuel-rich region while NO is released from the fuel-lean region. When diluted air enters the secondary combustion zone unburnt NH3 is expected to react with NO through selective non-catalytic reduction. Furthermore NH3-CH4-air combustion operation tests demonstrated that the increase of the NH3 fuel ratio significantly increasef the NO emission wheile it decreased the NO conversion ratio. To achieve low NOx combustion in NH3-air combustion gas turbines large quantities of NH3 fuel should be burned and produce both rich and lean fuel mixtures in the primary combustion zone.

Original languageEnglish
Pages (from-to)3351-3359
Number of pages9
JournalProceedings of the Combustion Institute
Issue number3
Publication statusPublished - 2017


  • Carbon-free power generation
  • Low NO combustion
  • NH-air gas turbine


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