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Non-thermal Plasma Application for Environmental Control

Non-thermal Plasma Application for Environmental Control. Abstract authors: Alexander Fridman and Alexander Gutsol University of Illinois at Chicago Presented by Johnny Liu 2002 Nov. . Outline. General description of Air pollutants Conventional VOC removal techniques

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Non-thermal Plasma Application for Environmental Control

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  1. Non-thermal Plasma Application for Environmental Control Abstract authors: Alexander Fridman and Alexander Gutsol University of Illinois at Chicago Presented by Johnny Liu 2002 Nov.

  2. Outline • General description of Air pollutants • Conventional VOC removal techniques • Non-thermal plasma technologies • Application of dielectric barrier discharge • Conclusions

  3. General Description of Air Pollutants • Acid gases, such as SOx, NOx, HCl etc. • Ozone depletion substances, such as FreonTM, HalonTM etc. • Volatile organic compounds (VOC), such as toluene, phenol, trichloro- ethylene etc. • Toxic gases, such as Hg, dioxins etc.

  4. Types of VOC *TLV, threshold level value in ppm reference: K. Urashima and J.S. Chang, IEEE Trans. Dielectrics and Electrical Insulation, Vol. 7, No. 5, October 2000.

  5. Conventional VOC removal techniques UV oxidation Thermal oxidation Thermal plasma reference: K. Urashima and J.S. Chang, IEEE Trans. Dielectrics and Electrical Insulation, Vol. 7, No. 5, October 2000.

  6. Non-thermal plasma technologies Non-thermal plasma: The electrons attain very high energies, while the background gas remains at ambient temperature. Mechanism of VOC treatment: - highly effective in promoting oxidation - enhance molecular dissociation - produce free radicals to enhance chemical reaction Advantages of non thermal plasma method - high removal efficiency - high energy yields - good economy

  7. Application: removal of Formaldehyde (HCHO) • Removal mechanisms: • Direct removal caused by the collision of electrons with HCHO. • Reaction between HCHO molecules and gas-phase radicals. reference: M. B. Chang and C.C. Lee, Environ. Sci. Technol. 1995, 29, p181-186

  8. Dielectric barrier discharge 60 Hz 3 kVA All the tests were completed at 1 atm, ambient temperature (24 ± 2 °C) . reference: M. B. Chang and C.C. Lee, Environ. Sci. Technol. 1995, 29, p181-186

  9. Result 1 The gas streams contain 100 ppm HCHO, 5% O2, 1% H2O (gas), and N2 as the carrier gas. reference: M. B. Chang and C.C. Lee, Environ. Sci. Technol. 1995, 29, p181-186

  10. Result 2 The gas streams contain 110 ppm HCHO, 20% O2, 2 slpm of total gas flow rate. reference: M. B. Chang and C.C. Lee, Environ. Sci. Technol. 1995, 29, p181-186

  11. Result 3 The gas streams contain 100 ppm HCHO, 1% H2O, and N2 as the carrier gas. reference: M. B. Chang and C.C. Lee, Environ. Sci. Technol. 1995, 29, p181-186

  12. Conclusions Emissions of volatile organic compounds into the atmosphere have the potential to cause adverse effects on human health and the environment. The HCHO can be effectively removed via applying dielectric barrier discharge plasma. Destruction of VOC molecules can be achieved by both “ direct electron attack” and “ indirect gas-phase radical reaction” mechanisms.

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