Effect of hydrogen addition on overall pollutant emissions of inverse diffusion flame

J. Miao, Chun Wah Leung, Chun Shun Cheung, Z. H. Huang, H. S. Zhen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)


In this paper, the effect of hydrogen (H2) addition on the pollutant emissions of an IDF (inverse diffusion flame) burning LPG (liquefied petroleum gas) has been studied. Pollutant emission behavior was intensively investigated at fuel lean condition, and CO2, CO, HC, and NOxemitted from the flame were measured with their emission indices reported. HC and CO emissions are highly dependent on overall equivalence ratio, and both HC and CO are very high at fuel lean condition while reduce to nearly zero at equivalence ratio larger than 0.8 in LPG-H2IDF. NOxemission follows the trend of HC due to N2O-intermediate and Fenimore mechanisms at fuel lean condition while NOxemission increases with equivalence ratio at fuel rich condition due to thermal NOxmechanism. Hydrogen addition is found to promote the conversion of CO and HC into CO2, and there exists a threshold fraction of hydrogen over which a significant reduction of CO and HC occurs. High air jet Reynolds number tends to induce poor combustion and thus increasing HC, CO and NOxemissions. Compared to LPG IDF, LPG-H2IDF starts to generate noticeably CO and HC emissions earlier, and both CO and HC emissions are heavier.
Original languageEnglish
Pages (from-to)284-294
Number of pages11
Publication statusPublished - 1 Jun 2016


  • CO emission
  • HC emission
  • Hydrogen
  • Inverse diffusion flame
  • Liquefied petroleum gas

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • General Energy
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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