A Review on Combustion Characteristics of Ammonia as a Carbon-Free Fuel

• Published in: Frontiers in energy research 2021-10, Vol.9
• Main Authors: Li, Jun, Lai, Shini, Chen, Danan, Wu, Rongjun, Kobayashi, Noriyuki, Deng, Lisheng, Huang, Hongyu
• Format: Article
• Language: English
• Subjects: ammonia; carbon-free fuel; combustion characteristics; laminar burning velocity; pollutant emissions
• ISSN: 2296-598X; 2296-598X
• DOI: 10.3389/fenrg.2021.760356

A comprehensive review of combustion characteristics of ammonia (NH 3 ) as a carbon free fuel is presented. NH 3 is an attractive alternative fuel candidate to reduce the consumption of fossil fuel and the emission of CO 2 , soot, and hydrocarbon pollutants, due to its comparable combustion properties, productivities from renewable sources, and storage and transportation by current commercial infrastructure. However, the combustion properties of NH 3 are quite different from conventional hydrocarbon fuels, which highlight the specific difficulties during the application of NH 3 . Therefore, this paper presents comparative experimental and numerical studies of the application of NH 3 as a fuel during combustion process, including the combustion properties of laminar burning velocity, flame structures, pollutant emissions for the application of NH 3 as a carbon free fuel. This paper presents the burning velocity and pollutant emissions of NH 3 alone and mixtures with other fuels to improve the combustion properties. The aim of this paper is to review and describe the suitability of NH 3 as a fuel, including the combustion and emission characteristics of NH 3 during its combustion process.