Characteristics of NH3/H2 blend as carbon-free fuels: A review

In the pursue of a carbon-free economy, the utilization of fuels with low or zero carbon footprint account for only 1% of global final energy demand, a share that is predicted to follow a dramatic growth to 20% by 2050. Ammonia (NH3) has become dominant in the international transportation and storag...

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Bibliographic Details
Main Authors: Awad, Omar I., Zhou, Bo, Harrath, Karim, Kadirgama, Kumaran
Format: Article
Language:English
English
Published: Elsevier Ltd 2023
Subjects:
Online Access:http://umpir.ump.edu.my/id/eprint/42911/1/Characteristics%20of%20NH3_H2%20blend%20as%20carbon-free%20fuels%20_A%20review.pdf
http://umpir.ump.edu.my/id/eprint/42911/2/Characteristics%20of%20NH3_H2%20blend%20as%20carbon-free%20fuels_A%20review_abs.pdf
http://umpir.ump.edu.my/id/eprint/42911/
https://doi.org/10.1016/j.ijhydene.2022.09.096
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Summary:In the pursue of a carbon-free economy, the utilization of fuels with low or zero carbon footprint account for only 1% of global final energy demand, a share that is predicted to follow a dramatic growth to 20% by 2050. Ammonia (NH3) has become dominant in the international transportation and storage of low-carbon alternative fuels. NH3 is regarded as an alternative fuel, as a carbon-free fuel, and renewable hydrogen (H2) carrier with high energy density, and its production and distribution infrastructure are well established. However, a current challenge is that NH3 has a lower burning velocity and a narrow flammability limit. Thus, the use of NH3 has numerous limitations in practical combustion applications. Blending NH3 with H2 is considered a solution that has been proposed to enhance NH3 combustion by improving ignition, flammability, and H2 safety issue. Using NH3 blended with H2 as a fuel in combustion systems is a practical approach to decarbonizing the energy sector. Thus, this review highlights the existing influential studies and ongoing research on NH3/H2 blended fuels. The review covers NH3 assists the safety behaviour of H2 use, in-situ NH3 dissociation, NH3 and H2 properties, NH3/H2 combustion characterization, techniques for low NOx NH3/H2 combustion, and challenges for NH3/H2 combustion. Finally, recommendations for future studies are provided for further developing the utilization of NH3/H2 as blended fuel.