A novel fluidized bed drying and density segregation process for upgrading low-rank coals

Nenad Sarunac, Edward K. Levy, Mark Ness, Charles W. Bullinger, Jonathan P. Mathews, Philip M. Halleck

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Lignite and sub-bituminous coals are attractive due to their low cost, low emissions, and high reactivity. However, these coals contain large amounts of moisture, which reduces calorific value and lowers plant efficiency. A novel fluidized bed drying process was developed that uses low-grade waste heat to reduce fuel moisture content of low-rank high-moisture coals and concurrently lowers sulfur and mercury content of dried coal through density segregation. This paper discusses quality improvement of low-rank coals by low-temperature thermal drying, describes changes in microstructure of coal particles and describes the reduction in sulfur and mercury via density segregation during thermal drying of lignite in a specially designed fluidized bed.

Original languageEnglish (US)
Pages (from-to)317-332
Number of pages16
JournalInternational Journal of Coal Preparation and Utilization
Volume29
Issue number6
DOIs
StatePublished - Nov 1 2009

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology
  • Mechanical Engineering

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