Submicrometer particle formation and mercury speciation under O2-CO2 coal combustion

Achariya Suriyawong, Michael Gamble, Myong Hwa Lee, Richard Axelbaum, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

153 Scopus citations

Abstract

The characteristics of the submicrometer mode of ash and mercury speciation on combustion of coal in an oxygen-carbon dioxide and air (conventional) system were compared. The experiments were conducted at digerent O2:CO2 and O2:N2: CO2 mixing ratios. On replacing the nitrogen in air with carbon dioxide, the total mass of the particles in the submicrometer mode (<0.5 μm) of ash was smaller. Correspondingly, the geometric mean size (dpg) of the submicrometer aerosol was smaller by approximately 28%. When the O2:CO2 ratio was increased from 1:4 to 4:4, the geometric mean size of the submicrometer mode increased from 29 to 54 nm because of a faster vaporization rate as a result of a higher coal particle temperature. An increase in the geometric mean size was observed on increasing the N2:CO2 ratio at a fixed O2 concentration because of the same reasons. The shape of the primary particles was spherical in all the tests, indicating that a vapor to particle transformation pathhway was prevalent. The ratios of elemental to oxidized mercury (approximately 4:1) were similar for O2-CO2 and air combustion.

Original languageEnglish (US)
Pages (from-to)2357-2363
Number of pages7
JournalEnergy and Fuels
Volume20
Issue number6
DOIs
StatePublished - Nov 2006
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

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