Investigation of NO emission characteristics from co-combustion of methane and ammonia at high-altitude areas.

J Hazard Mater

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China; State Key Laboratory of Low-carbon Thermal Power Generation Technology and Equipment, Harbin, Heilongjiang 150001, China; National innovation Platform for Industry-Education Integration of Energy Storage Technology, Harbin Institute of technology, Harbin, Heilongjiang 150001, China.

Published: December 2024

AI Article Synopsis

  • High-altitude regions in China have a potential for renewable energy and ammonia production, leading to a proposed co-combustion strategy of methane and ammonia to lower carbon emissions.
  • A specialized combustion system was used to test how different ammonia mixing ratios, equivalence ratios, and pressures affect nitrogen oxide (NO) emissions in flames fueled by methane and ammonia.
  • Findings show that higher ammonia ratios increase NO emissions in stoichiometric flames but remain constant in fuel-rich flames at ratios above 10%. Sub-atmospheric pressure raises NO levels, especially in fuel-rich conditions, but doesn't significantly change nitrogen conversion pathways.

Article Abstract

The high-altitude areas of China are abundant in renewable energy and have a natural advantage in ammonia production. Based on this advantage, this paper proposes a co-combustion strategy for methane and ammonia to reduce carbon emissions in these areas. However, the NO emission characteristics associated with this strategy remain uncertain. A custom-designed combustion system capable of simulating high-altitude environments was used to investigate the effect of ammonia mixing ratio, equivalence ratio, and pressure on NO emission in methane/ammonia/air flames. Additionally, chemical kinetic calculations were conducted to explore the mechanisms of how sub-atmospheric pressure influences NO emission. The results indicate that for stoichiometric flames, NO increases with the ammonia mixing ratio. In fuel-rich flames, NO remains nearly constant once the ammonia mixing ratio exceeds 10 %. Sub-atmospheric pressure leads to higher NO, particularly in fuel-rich flames, where the increase can reach up to 24.4 %. Analysis of nitrogen reaction pathways and key radical concentrations reveals that sub-atmospheric pressure has a minimal effect on nitrogen conversion pathways. The variation in NO is achieved by altering the pathway contributions and the concentrations of H, NH, and N. This work provides direction and guidance for improving the application of methane and ammonia co-combustion in high-altitude areas.

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http://dx.doi.org/10.1016/j.jhazmat.2024.136744DOI Listing

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