Speaker
Ms
Yongxia Sun
(Institute of Nuclear Chemistry and Technology, Poland)
Description
Nitrogen oxides (NOx) , sulphur dioxide (SO2), volatile organic pollutants (VOCs), polyaromatic hydrocarbons (PAHs) and dioxins are still main air pollutants. They are mostly formed during fossil fuels combustion, solid waste incineration or at other industrial processes. In recent years, cargo ships are the major emission source of SO2 and NOx emission generating very high concentrations of these pollutants in off gases.
Electron beam (EB) flue gas treatment technology for purification of gaseous effluents from coal fired boilers after testing in Japan, US, Germany, Poland, China and Bulgaria has been implemented in industrial scale in Pomorzany Power Plant, Szczecin, Poland. It is a dry scrubbing process with ammonia addition, high removal efficiency of SO2 ( > 90% ) and NOx ( >70%) were obtained at 8 kGy absorbed dose, benign products were formed. EBFGT is also a very promising technology to remove SO2 and NOx from flue gas generated by oil fired burner plants what was demonstrated at the pilot test carried out in Saudi Arabian oil refinery plant using a mobile accelerator. High removal efficiency of SO2 can be easily achieved at low dose, however it needs very high does ( i.e., high energy consumption ) to obtain high removal efficiency of NOx. EB technology combined with catalyst to increase removal efficiency of NO emitted from stationary source was investigated through computer modeling simulations. The feasibility to remove SO2 and NOx from off gases generated from cargo ship by using EB technology was investigated, preliminary results showed that EB technology might be used to remove SO2 and NOx from off gases emitted from cargo ship with presence of wet scrubbers instead of ammonia addition. NOx removal efficiency was increased from 3% ( EB only) up to 62% ( EB combined with 4.5% salty water scrubbers) at 8.8 kGy absorbed dose at 90 Celsius degree for the initial concentration of NOx being 1500 ppmv with 500 ppmv SO2 presence. EB technology might be used for PAHs and other organic pollutants removal as well. Recently emerging organic pollutants have been detected in tap water or ground water , their persistence cause people’s concern. Institute of Nuclear Energy and Technology (INCT) researchers have studied perfluorinated organic compounds ( perfluoctanoic acid as a representative compound) destruction in aqueous solution by using EB or gamma irradiation. It showed that more than 80% PFOA was decomposed at 5 kGy dose under gamma ray irradiation in argon-saturated solution of pH 2.0 containing 20 mg/L of t-butanol for initial concentration of PFOA being 1 mg/L; under EB irradiation, nearly 100% PFOA was decomposed at 105 kGy dose. In order to get better understanding decomposition mechanism of PFOA under EB irradiation, a computer simulation was carried out. Good agreement was obtained between calculation and experimental results.
| Country/Organization invited to participate | Poland |
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Primary author
Ms
Yongxia Sun
(Institute of Nuclear Chemistry and Technology, Poland)
Co-author
Mr
Andrzej G. Chmielewski
(Institute of Nuclear Chemistry and Technology, Poland)
