Application of powdered activated carbon coating to fabrics in a hybrid filter to enhance mercury removal

Jin Ho Sung, Seung Ki Back, Eun Song Lee, Ha Na Jang, Yong Chil Seo, Youn Suk Kang, Myong Hwa Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Elemental mercury (Hg 0 ) is predominant constituent of flue gas emitted from coal-fired power plants. Adsorption has been considered the best available technology for removal of Hg 0 from flue gas. However, adsorbent injection increases the amount of ash generated. In the present study, powdered activated carbon (PAC) was coated on polytetrafluoroethylene/glass fiber filters to increase Hg 0 removal while concurrently reducing the amount of ash generated. The optimal PAC coating rate was determined in laboratory experiments to ensure better Hg 0 removal with low pressure drop. When PAC of particle size less than 45 μm was used, and the areal density was 50 g/m 2 , the pressure drop remained under 30 Pa while the Hg 0 removal efficiency increased to 15.8% from 4.3%. The Hg 0 removal efficiency also increased with decrease in filtration velocity. The optimal PAC coating rate was applied on a hybrid filter (HF), which was combined with a bag filter and an electrostatic precipitator in a single chamber. Originally designed to remove fine particulates matter, it was retrofitted to the flue gas control device for simultaneous Hg 0 removal. By employing the PAC coating, the Hg removal efficiency of the HF increased to 79.79% from 66.35%. Also, a temporary reduction in Hg removal was seen but this was resolved following a cleaning cycle in which the dust layer was removed.

Original languageEnglish
Pages (from-to)58-65
Number of pages8
JournalJournal of Environmental Sciences (China)
Volume80
DOIs
Publication statusPublished - 2019 Jun

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Environmental Science(all)

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