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Related Experiment Videos

Trace elements in two pulverized coal-fired power stations.

K Sandelin1, R Backman

  • 1Abo Akademi University, Process Chemistry Group, Lemminkäisenkatu 14-18 B, FIN-20520 Turku, Finland. kristoffer.sandellin@abo.fi

Environmental Science & Technology
|May 16, 2001
PubMed
Summary

This study predicts the fate of toxic trace elements during coal combustion. Most elements like arsenic and lead are captured in fly ash or dissolve in flue gas scrubbers, correlating with particle capture efficiency.

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Geochemistry

Background:

  • Coal combustion releases major pollutants and toxic trace elements.
  • Understanding the environmental fate of these elements is crucial for power plant emissions control.

Purpose of the Study:

  • To predict the partitioning and behavior of eight trace elements (As, Cd, Hg, Ni, Pb, Se, V, Zn) in coal-fired power plants with flue gas scrubbers.
  • To correlate predicted trace element behavior with measured data from operational facilities.

Main Methods:

  • Global equilibrium analysis using extensive databases for reaction conditions.
  • Modeling of furnace, flue gas duct, and flue gas scrubber environments.
  • Incorporation of ash melting behavior and trace element slag solubility data.

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Main Results:

  • Arsenic, cadmium, nickel, lead, vanadium, and zinc are primarily captured in fly ash, linked to particle capture efficiency.
  • Nonvolatile trace elements dissolve in scrubber solutions, with capture correlating to particulate behavior.
  • Theoretical predictions suggest arsenic, nickel, zinc, and lead dissolve in molten ash.

Conclusions:

  • The study provides a predictive model for trace element behavior in coal power plants.
  • Findings aid in optimizing emissions control strategies for toxic elements.
  • Trace element fate is strongly linked to physical capture processes (fly ash and scrubbers).