Pollutant Emissions Reporting for Ammonia Fuel Blends
Author(s)
Douglas, Christopher M.
Steele, Robert
Martz, Tom
Noble, Bobby
Emerson, Benjamin L.
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Abstract
To combat carbon dioxide emissions, it is desirable to transition existing combustion systems to
carbon-free fuels such as hydrogen and ammonia without negatively impacting air quality. However,
quantitatively assessing air quality impacts of pollutants such as NOx is a nuanced process when
comparing emissions across different fuels. Recently, the authors of this study published a separate
paper showing that some standardized measurement approaches (i.e., measuring dried exhaust
concentration) were inflating pollutant emissions by up to 40% for hydrogen combustion relative to
natural gas. In this white paper, we extend this analysis to ammonia and cracked ammonia blends,
showing that using concentration-based reporting approaches for comparing NOx from ammonia
combustion is appropriate (less than a 3% effect), but can inflate apparent NOx emissions from fully cracked ammonia (i.e., an H2/N2 fuel blend) by 20%.
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Date
2022-11-04
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Resource Type
Text
Resource Subtype
White Paper