Application of powdered activated carbon coating to fabrics in a hybrid filter to enhance mercury removal
| Autor: | Eun Song Lee, Myong-Hwa Lee, Yong-Chil Seo, Youn Suk Kang, Jin Ho Sung, Ha Na Jang, Seung Ki Back |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Powdered activated carbon treatment
Flue gas Environmental Engineering Materials science 020209 energy Electrostatic precipitator 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences Adsorption Coating Air Pollution 0202 electrical engineering electronic engineering information engineering medicine Environmental Chemistry 0105 earth and related environmental sciences General Environmental Science Pressure drop Air Pollutants General Medicine Mercury Chemical engineering Charcoal engineering Particle size Filtration Activated carbon medicine.drug Power Plants |
| Zdroj: | Journal of environmental sciences (China). 80 |
| ISSN: | 1001-0742 |
| Popis: | Elemental mercury (Hg0) is predominant constituent of flue gas emitted from coal-fired power plants. Adsorption has been considered the best available technology for removal of Hg0 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 Hg0 removal while concurrently reducing the amount of ash generated. The optimal PAC coating rate was determined in laboratory experiments to ensure better Hg0 removal with low pressure drop. When PAC of particle size less than 45 μm was used, and the areal density was 50 g/m2, the pressure drop remained under 30 Pa while the Hg0 removal efficiency increased to 15.8% from 4.3%. The Hg0 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 Hg0 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. |
| Databáze: | OpenAIRE |
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